CN111266026A - Automatic mixed gas proportioning device for gas shielded welding and proportioning method thereof - Google Patents
Automatic mixed gas proportioning device for gas shielded welding and proportioning method thereof Download PDFInfo
- Publication number
- CN111266026A CN111266026A CN202010087503.2A CN202010087503A CN111266026A CN 111266026 A CN111266026 A CN 111266026A CN 202010087503 A CN202010087503 A CN 202010087503A CN 111266026 A CN111266026 A CN 111266026A
- Authority
- CN
- China
- Prior art keywords
- gas
- pressure
- smc
- mixed
- proportioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
- B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
- B01F23/191—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means characterised by the construction of the controlling means
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to an automatic mixed gas proportioning device for gas shielded welding and a proportioning method thereof. The proportioning device comprises a gas source 1, a gas source 2, a pressure reducing device 1, a pressure reducing device 2, a pressure transmitter device 1, a pressure transmitter device 2, a solenoid valve 1, a solenoid valve 2, an SMC vortex flowmeter 1, an SMC vortex flowmeter 2, a PLC control system, a gas analyzer and a mixer buffer tank; the invention can ensure that the precision of the error of mixing two mixed gases is less than or equal to 1 percent; the pressure of the input and output mixed gas and the mixing proportion of the two gases are adjusted online at any time; the user can perform percentage stepless regulation on the pressure and the mixing ratio accurately through the controller touch type liquid crystal display screen; the gas mixing process is efficient and safe, the built-in isobaric regulating device of the device ensures that the gas mixing precision is not influenced by the change of inlet pressure, and the gas taking response speed is high.
Description
Technical Field
The invention relates to the technical field of gas shielded welding, in particular to an automatic mixed gas proportioning device for gas shielded welding and a proportioning method thereof.
Background
Mixed gases are increasingly used as shielding gases in welding processes. In the manufacturing industry of high-speed development of intelligent automation, gas shielded welding has gradually replaced shielded metal arc welding. Pure CO2 or pure Ar as the protective gas can not meet the welding requirements of the more and more complex process and materials at present. The mixed gas shielded welding has the advantages that the appearance of a welding seam is formed, the quality of a welding joint is welded, the penetration and the fusion width are wide, the welding speed, the welding spatter and the stability of a welding arc are all higher than those of pure CO2Or the simple Ar gas shielded welding is greatly improved. At present, with the improvement of the welding technical level and the automation level in China and the increasing improvement of the welding quality requirement and the welding efficiency of various industries, the application range of the mixed gas shielded welding is continuously expanded.
At present, the traditional mechanical manual adjustment gas mixing proportioner is generally applied to the market, the proportioner has no digital display, the accuracy is low, the gas mixing proportion is not uniform enough, and the welding quality is seriously influenced. It is well known that a mixed gas ratio difference of + -1.0% results in stability of the welding arc, a welding droplet transition form, a welding spatter amount, a weld formation and a welded joint quality during welding. Therefore, high-precision mixed gas proportion control and uniform mixing of the shielding gas are important factors for ensuring high-quality welding of the mixed gas shielded welding.
With the continuous advance of the industrialization process in China, the rising of high-efficiency high-quality manufacturing and intelligent manufacturing, the requirement of the mixed gas shielded welding on a high-precision mixed gas proportioning technology is increasingly obvious, so that the deep research on the mixed gas proportioning technology is of great significance in the engineering application of developing a mixed gas proportioning device with high precision, digital display and uniform mixing.
Disclosure of Invention
The invention provides an automatic mixed gas proportioning device for gas shielded welding and a proportioning method thereof, in order to realize automatic proportioning of mixed gas for gas shielded welding, and the invention provides the following technical scheme:
a mixed gas automatic proportioner for gas shielded welding comprises a gas source 1, a gas source 2, a pressure reducing device 1, a pressure reducing device 2, a pressure transmitter device 1, a pressure transmitter device 2, a solenoid valve 1, a solenoid valve 2, an SMC vortex shedding flowmeter 1, an SMC vortex shedding flowmeter 2, a PLC control system, a gas analyzer and a mixer buffer tank;
the gas source 1 is connected with a pressure reducing device 1, the pressure reducing device 1 is connected with a pressure transmitter device 1, the pressure transmitter device 1 is connected with a solenoid valve 1, the solenoid valve 1 is connected with an SMC vortex flowmeter 1, and the SMC vortex flowmeter 1 is connected with a mixer buffer tank;
the gas source 2 is connected with the pressure reducing device 2, the pressure reducing device 2 is connected with the pressure transmitter device 2, the pressure transmitter device 2 is connected with the electromagnetic valve 2, the electromagnetic valve 2 is connected with the SMC vortex shedding flowmeter 2, and the SMC vortex shedding flowmeter 2 is connected with the mixer buffer tank;
the gas analyzer is in communication connection with the PLC control system and is connected with the mixer buffer tank; the control signal output end of the PLC control system is connected with the electromagnetic valve 1 and the electromagnetic valve 2, and the data signal output ends of the pressure transmitter device 1 and the pressure transmitter device 2 are connected with the PLC control system; and the data signal output ends of the SMC vortex shedding flowmeter 1 and the SMC vortex shedding flowmeter 2 are connected with a PLC control system.
Preferably, the proportioner further comprises a quick coupling, and the SMC vortex shedding flowmeter 1 and the SMC vortex shedding flowmeter 2 are both connected with the mixer buffer tank through the quick coupling.
Preferably, the PLC control system employs a Siemens PLC200 series 224 CPU.
Preferably, the PLC control system is integrated with a face touch integrated display screen.
An automatic mixing method of mixed gas for gas shielded welding comprises the following steps:
step 1: entering a mixing control stage;
step 2: entering a gas mixing proportion control section, opening the electromagnetic valves 1 and 2, metering the outflow gas by adopting an SMC vortex flowmeter, and automatically cutting off the electromagnetic valve corresponding to the gas circuit when the metering value is equal to the quantity of the gas to be input;
and step 3: and carrying out detection feedback compensation to complete gas mixing.
Preferably, the step 1 specifically comprises:
step 1.1: after two mixed gases are respectively output from a gas source 1 and a gas source 2 and are reduced to set pressure through a pressure reducing device, a PLC control system controls a solenoid valve switch to control the mixed gases to flow into a mixer buffer gas tank;
step 1.2: the flow of two kinds of mixed gas is detected respectively through SMC vortex flowmeter, adopts a thermal conductivity gas analyzer to carry out analysis to a gas content in the blender buffer gas jar to give PLC control system with the analysis result, PLC control system compares with the settlement pressure according to current blending tank pressure, confirms the volume of two kinds of mixed gas that need input according to the result of comparison and predetermined gas percentage.
Preferably, the step 3 specifically comprises:
judging the proportion of a gas according to a gas analyzer, and when the proportion deviation is within the range of 1%, not performing feedback compensation; and when the deviation exceeds 1%, opening the electromagnetic valve of the gas or the other gas, compensating the gas amount again according to the deviation range, and performing feedback compensation adjustment, so that the proportion of the gas in the mixed gas in the gas storage tank is within the allowable error range and is used for welding.
Preferably, the set pressure is determined by:
determining a source pressure to control pressure relationship based on an ideal gas equation of state, the relationship being represented by:
Ps×△V ＝△P×VD(1)
wherein, PsIs air pressure of air source, △ P is current pressure PppAnd the control pressure PpcThe difference is △ V is the gas flow rate to be inputDThe volume of the mixed gas storage tank;
the gas flow △ V to be input in the mixed gas tank comprises two mixed gas parts, and the pressure difference is PppAnd PpcThe difference between the two values is:
Ps×(△V1+△V2)＝(P0+ P1)×VD(2)
and the percentages of the two mixed gases in the gas storage tank satisfy the following formula:
θ1+θ2＝1 (3)
wherein, theta1Is the percentage of a mixed gas，θ2Is the percentage of the other mixed gas;
the amount △ V of the two gases to be injected in the gas proportion mixing stage is determined according to the formulas (1) to (3)1And △ V2。
The invention has the following beneficial effects:
the invention adopts the volume equation mixing principle, synchronously changes the volumes of two mixed gases according to the linear relationship of the tapers of the proportional valves, and realizes the accurate change of the proportion of the two mixed gases; the invention can ensure that the precision of the error of mixing two mixed gases is less than or equal to 1 percent; the pressure of the input and output mixed gas and the mixing proportion of the two gases are adjusted online at any time; the user can perform percentage stepless regulation on the pressure and the mixing ratio accurately through the controller touch type liquid crystal display screen; the built-in isobaric regulating device of the device ensures that the gas mixing precision is not influenced by the change of inlet pressure, and the gas taking response speed is high; the equipment panel has a locking function, so that the situation that the set value is changed accidentally and the next operation can be carried out only by pressing a locking key for a long time when data is required to be changed is avoided; the invention has digital display function, which is more visual; the invention has the function of heating gas on line quickly, and ensures that no moisture interference exists in CO 2; the invention designs a buffer tank. The mixed gas is fully mixed after entering the buffer tank and then input, so that the gas is ensured to obtain the best mixing effect.
Drawings
FIG. 1 is a structural diagram of an automatic gas mixture proportioning device for gas shielded welding;
FIG. 2 is a flow chart of a method for automatically proportioning mixed gases for gas shielded welding;
FIG. 3 is a flow chart of the control of the gas proportional compounding stage;
FIG. 4 is a control flow diagram of the phase of detection feedback compensation;
FIG. 5 is a schematic diagram of a mixed gas proportioner for gas shielded welding.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows:
according to the invention, as shown in fig. 1 and 5, the invention provides an automatic proportioner of mixed gas for gas shielded welding, which comprises a gas source 1, a gas source 2, a pressure reducing device 1, a pressure reducing device 2, a pressure transmitter device 1, a pressure transmitter device 2, a solenoid valve 1, a solenoid valve 2, an SMC vortex shedding flowmeter 1, an SMC vortex shedding flowmeter 2, a PLC control system, a gas analyzer and a mixer buffer tank;
the gas source 1 is connected with a pressure reducing device 1, the pressure reducing device 1 is connected with a pressure transmitter device 1, the pressure transmitter device 1 is connected with a solenoid valve 1, the solenoid valve 1 is connected with an SMC vortex flowmeter 1, and the SMC vortex flowmeter 1 is connected with a mixer buffer tank;
the gas source 2 is connected with the pressure reducing device 2, the pressure reducing device 2 is connected with the pressure transmitter device 2, the pressure transmitter device 2 is connected with the electromagnetic valve 2, the electromagnetic valve 2 is connected with the SMC vortex shedding flowmeter 2, and the SMC vortex shedding flowmeter 2 is connected with the mixer buffer tank;
the gas analyzer is in communication connection with the PLC control system and is connected with the mixer buffer tank; the control signal output end of the PLC control system is connected with the electromagnetic valve 1 and the electromagnetic valve 2, and the data signal output ends of the pressure transmitter device 1 and the pressure transmitter device 2 are connected with the PLC control system; and the data signal output ends of the SMC vortex shedding flowmeter 1 and the SMC vortex shedding flowmeter 2 are connected with a PLC control system. The proportioner also comprises a quick joint, and the SMC vortex shedding flowmeter 1 and the SMC vortex shedding flowmeter 2 are both connected with the mixer buffer tank through the quick joint. The PLC control system adopts Siemens PLC200 series 224 CPU. The PLC control system is integrated with a face touch control integrated display screen. And the PLC finishes data acquisition and recording and external IO control. Touch screen mixed gas flow control and display
The second embodiment is as follows:
as shown in fig. 2 to 4, the invention provides an automatic mixing method of mixed gas for gas shielded welding, which comprises the following steps:
step 1: entering a mixing control stage;
the step 1 specifically comprises the following steps:
step 1.1: after two mixed gases are respectively output from a gas source 1 and a gas source 2 and are reduced to set pressure through a pressure reducing device, a PLC control system controls a solenoid valve switch to control the mixed gases to flow into a mixer buffer gas tank;
step 1.2: the flow of two kinds of mixed gas is detected respectively through SMC vortex flowmeter, adopts a thermal conductivity gas analyzer to carry out analysis to a gas content in the blender buffer gas jar to give PLC control system with the analysis result, PLC control system compares with the settlement pressure according to current blending tank pressure, confirms the volume of two kinds of mixed gas that need input according to the result of comparison and predetermined gas percentage.
The set pressure is determined by:
determining a source pressure to control pressure relationship based on an ideal gas equation of state, the relationship being represented by:
Ps×△V ＝△P×VD(1)
wherein, PsIs the air pressure of the air source, △ P is the difference between the current pressure and the control pressure, △ V is the flow rate of the air to be input, VDThe volume of the mixed gas storage tank;
due to input in the mixing tankThe gas flow △ V includes two mixed gas portions with a pressure differential PppAnd PpcThe difference between the two values is:
Ps×(△V1+△V2)＝(P0+ P1)×VD(2)
and the percentages of the two mixed gases in the gas storage tank satisfy the following formula:
θ1+θ2＝1 (3)
wherein, theta1Is the percentage of a mixed gas，θ2Is the percentage of the other mixed gas;
the amount △ V of the two gases to be injected in the gas proportion mixing stage is determined according to the formulas (1) to (3)1And △ V2。
Step 2: entering a gas mixing proportion control section, opening the electromagnetic valves 1 and 2, metering the outflow gas by adopting an SMC vortex flowmeter, and automatically cutting off the electromagnetic valve corresponding to the gas circuit when the metering value is equal to the quantity of the gas to be input;
and step 3: and carrying out detection feedback compensation to complete gas mixing.
The step 3 specifically comprises the following steps:
judging the proportion of a gas according to a gas analyzer, and when the proportion deviation is within the range of 1%, not performing feedback compensation; and when the deviation exceeds 1%, opening the electromagnetic valve of the gas or the other gas, compensating the gas amount again according to the deviation range, and performing feedback compensation adjustment, so that the proportion of the gas in the mixed gas in the gas storage tank is within the allowable error range and is used for welding.
The above description is only a preferred embodiment of the automatic mixed gas proportioner for gas shielded welding and the proportioning method thereof, and the protection scope of the automatic mixed gas proportioner for gas shielded welding and the proportioning method thereof is not limited to the above embodiments, and all technical schemes belonging to the idea belong to the protection scope of the invention. It should be noted that modifications and variations which do not depart from the gist of the invention will be those skilled in the art to which the invention pertains and which are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a gas shielded arc welding is with automatic proportioner of mist which characterized by: the proportioning device comprises a gas source 1, a gas source 2, a pressure reducing device 1, a pressure reducing device 2, a pressure transmitter device 1, a pressure transmitter device 2, a solenoid valve 1, a solenoid valve 2, an SMC vortex flowmeter 1, an SMC vortex flowmeter 2, a PLC control system, a gas analyzer and a mixer buffer tank;
the gas source 1 is connected with a pressure reducing device 1, the pressure reducing device 1 is connected with a pressure transmitter device 1, the pressure transmitter device 1 is connected with a solenoid valve 1, the solenoid valve 1 is connected with an SMC vortex flowmeter 1, and the SMC vortex flowmeter 1 is connected with a mixer buffer tank;
the gas source 2 is connected with the pressure reducing device 2, the pressure reducing device 2 is connected with the pressure transmitter device 2, the pressure transmitter device 2 is connected with the electromagnetic valve 2, the electromagnetic valve 2 is connected with the SMC vortex shedding flowmeter 2, and the SMC vortex shedding flowmeter 2 is connected with the mixer buffer tank;
the gas analyzer is in communication connection with the PLC control system and is connected with the mixer buffer tank; the control signal output end of the PLC control system is connected with the electromagnetic valve 1 and the electromagnetic valve 2, and the data signal output ends of the pressure transmitter device 1 and the pressure transmitter device 2 are connected with the PLC control system; and the data signal output ends of the SMC vortex shedding flowmeter 1 and the SMC vortex shedding flowmeter 2 are connected with a PLC control system.
2. The automatic gas mixture proportioning device for gas shielded welding as claimed in claim 1, wherein: the proportioner also comprises a quick joint, and the SMC vortex shedding flowmeter 1 and the SMC vortex shedding flowmeter 2 are both connected with the mixer buffer tank through the quick joint.
3. The automatic gas mixture proportioning device for gas shielded welding as claimed in claim 1, wherein: the PLC control system adopts Siemens PLC200 series 224 CPU.
4. The automatic gas mixture proportioning device for gas shielded welding as claimed in claim 3, wherein: the PLC control system is integrated with a face touch control integrated display screen.
5. An automatic mixed gas proportioning method for gas shielded welding, which is based on the automatic mixed gas proportioning device for gas shielded welding as claimed in claim 1, and is characterized in that: the method comprises the following steps:
step 1: entering a mixing control stage;
step 2: entering a gas mixing proportion control section, opening the electromagnetic valves 1 and 2, metering the outflow gas by adopting an SMC vortex flowmeter, and automatically cutting off the electromagnetic valve corresponding to the gas circuit when the metering value is equal to the quantity of the gas to be input;
and step 3: and carrying out detection feedback compensation to complete gas mixing.
6. The automatic proportioning method of the mixed gas for gas shielded welding as set forth in claim 5, characterized in that: the step 1 specifically comprises the following steps:
step 1.1: after two mixed gases are respectively output from a gas source 1 and a gas source 2 and are reduced to set pressure through a pressure reducing device, a PLC control system controls a solenoid valve switch to control the mixed gases to flow into a mixer buffer gas tank;
step 1.2: the flow of two kinds of mixed gas is detected respectively through SMC vortex flowmeter, adopts a thermal conductivity gas analyzer to carry out analysis to a gas content in the blender buffer gas jar to give PLC control system with the analysis result, PLC control system compares with the settlement pressure according to current blending tank pressure, confirms the volume of two kinds of mixed gas that need input according to the result of comparison and predetermined gas percentage.
7. The automatic proportioning method of the mixed gas for gas shielded welding as set forth in claim 5, characterized in that: the step 3 specifically comprises the following steps:
judging the proportion of a gas according to a gas analyzer, and when the proportion deviation is within the range of 1%, not performing feedback compensation; and when the deviation exceeds 1%, opening the electromagnetic valve of the gas or the other gas, compensating the gas amount again according to the deviation range, and performing feedback compensation adjustment, so that the proportion of the gas in the mixed gas in the gas storage tank is within the allowable error range and is used for welding.
8. The automatic proportioning method of the mixed gas for the gas shielded welding as set forth in claim 6, characterized in that: the set pressure is determined by:
determining a source pressure to control pressure relationship based on an ideal gas equation of state, the relationship being represented by:
Ps×△V＝△P×VD(1)
wherein, PsIs air pressure of air source, △ P is current pressure PppAnd the control pressure PpcThe difference is △ V is the gas flow rate to be inputDThe volume of the mixed gas storage tank;
the gas flow △ V to be input in the mixed gas tank comprises two mixed gas parts, and the pressure difference is PppAnd PpcThe difference between the two values is:
Ps×(△V1+△V2)＝(P0+P1)×VD(2)
and the percentages of the two mixed gases in the gas storage tank satisfy the following formula:
θ1+θ2＝1 (3)
wherein, theta1Is a percentage of a mixed gas, theta2Is the percentage of the other mixed gas;
the amount △ V of the two gases to be injected in the gas proportion mixing stage is determined according to the formulas (1) to (3)1And △ V2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010087503.2A CN111266026B (en) | 2020-02-11 | 2020-02-11 | Automatic mixed gas proportioning device for gas shielded welding and proportioning method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010087503.2A CN111266026B (en) | 2020-02-11 | 2020-02-11 | Automatic mixed gas proportioning device for gas shielded welding and proportioning method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111266026A true CN111266026A (en) | 2020-06-12 |
| CN111266026B CN111266026B (en) | 2021-02-19 |
Family
ID=70991141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010087503.2A Active CN111266026B (en) | 2020-02-11 | 2020-02-11 | Automatic mixed gas proportioning device for gas shielded welding and proportioning method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111266026B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113209845A (en) * | 2021-05-07 | 2021-08-06 | 江苏兴毅科技有限公司 | Intelligent gas mixing system |
| CN113351120A (en) * | 2021-06-08 | 2021-09-07 | 哈尔滨工业大学 | Gas mixing system and mixing method |
| CN113813803A (en) * | 2021-06-08 | 2021-12-21 | 福尼斯(南京)表面工程技术有限公司 | High-precision multi-component gas proportioning method for surfacing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2200478Y (en) * | 1994-07-21 | 1995-06-14 | 上海水产大学 | Gas proportion mixing device |
| JPH1024226A (en) * | 1996-07-12 | 1998-01-27 | Yokogawa Electric Corp | Automatic gaseous mixture generator |
| CN203389602U (en) * | 2013-08-09 | 2014-01-15 | 武汉理工大学 | Multi-component static air distribution system based on mass air distribution method |
| CN203678345U (en) * | 2014-01-14 | 2014-07-02 | 佛山市嘉瑞达科技有限公司 | Automatic proportioning device for mixed gas |
| CN205462099U (en) * | 2015-12-31 | 2016-08-17 | 上海和立工业气体有限公司 | Controlling means is thoughtlessly joined in marriage to gas |
| CN208943857U (en) * | 2018-08-08 | 2019-06-07 | 北京特种工程设计研究院 | A kind of gas mixer |
-
2020
- 2020-02-11 CN CN202010087503.2A patent/CN111266026B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2200478Y (en) * | 1994-07-21 | 1995-06-14 | 上海水产大学 | Gas proportion mixing device |
| JPH1024226A (en) * | 1996-07-12 | 1998-01-27 | Yokogawa Electric Corp | Automatic gaseous mixture generator |
| CN203389602U (en) * | 2013-08-09 | 2014-01-15 | 武汉理工大学 | Multi-component static air distribution system based on mass air distribution method |
| CN203678345U (en) * | 2014-01-14 | 2014-07-02 | 佛山市嘉瑞达科技有限公司 | Automatic proportioning device for mixed gas |
| CN205462099U (en) * | 2015-12-31 | 2016-08-17 | 上海和立工业气体有限公司 | Controlling means is thoughtlessly joined in marriage to gas |
| CN208943857U (en) * | 2018-08-08 | 2019-06-07 | 北京特种工程设计研究院 | A kind of gas mixer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113209845A (en) * | 2021-05-07 | 2021-08-06 | 江苏兴毅科技有限公司 | Intelligent gas mixing system |
| CN113351120A (en) * | 2021-06-08 | 2021-09-07 | 哈尔滨工业大学 | Gas mixing system and mixing method |
| CN113813803A (en) * | 2021-06-08 | 2021-12-21 | 福尼斯(南京)表面工程技术有限公司 | High-precision multi-component gas proportioning method for surfacing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111266026B (en) | 2021-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111266026B (en) | Automatic mixed gas proportioning device for gas shielded welding and proportioning method thereof | |
| CN108388278B (en) | Multi-variable decoupling-based multi-gas mixing method and system | |
| CA2013161C (en) | Automatic density controller apparatus and method | |
| CN100371507C (en) | Control system and method for crystal isodiametric growth | |
| CN111408289B (en) | Method and system for industrially continuously mixing gas with high precision | |
| CN105606733B (en) | One kind sampling external circulating system and outer circulation type binary channels on-line period analysis system | |
| CN214570954U (en) | Intelligent coagulant adding system | |
| CN115585401A (en) | Method and system for controlling natural gas hydrogen-loading concentration of gas pipeline | |
| CN204513798U (en) | A kind of Combustion of Hot Air Furnace control device | |
| CN204883403U (en) | Online ratio detecting system of solution strength | |
| CN203678345U (en) | Automatic proportioning device for mixed gas | |
| CN101676826B (en) | Coordination control system of double metal spiral compound pipe molding and welding | |
| CN112677314A (en) | Electric drive type high-energy mixer for well cementation and slurry premixing control method | |
| CN102660333A (en) | Converter gas calorific value stability control method and control system thereof | |
| CN217663145U (en) | Online dilution system | |
| JPH01321508A (en) | Oxygen density controller | |
| CN201203563Y (en) | Fluid loop-closed type integrated on-line liquid density transmitter | |
| CN103238046A (en) | Low pressure drop blender | |
| CN201135861Y (en) | Gases accurate proportioning device | |
| CN116007717A (en) | Metering verification system and method for flowmeter for aviation fuel | |
| CN1776558A (en) | Method for realizing liquid ratio control | |
| CN1434262A (en) | On-line mixing gas-supply equipment for magnesium alloy smelting protection | |
| CN1474244A (en) | Precision gas proportioning device | |
| CN114100499B (en) | Automatic nitric acid preparation system and method for automatically preparing nitric acid solution | |
| CN212779674U (en) | Natural gas calorific value calculation device and natural gas calorific value calculation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liang Xiaomei Inventor after: Zou Jipeng Inventor after: Fu Ao Inventor after: Fang Naiwen Inventor after: Huang Ruisheng Inventor after: Li Liansheng Inventor after: Zhou Kun Inventor after: Zhao Bao Inventor after: Xu Yinan Inventor after: Yang Yicheng Inventor after: Ma Yiming Inventor before: Fang Naiwen Inventor before: Fu Ao Inventor before: Zhou Kun Inventor before: Zhao Bao Inventor before: Li Liansheng Inventor before: Huang Ruisheng Inventor before: Xu Yinan Inventor before: Ma Yiming Inventor before: Yang Yicheng Inventor before: Zou Jipeng |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |