CN114426149A - Accurate liquid feeding device and method in PI resin production process - Google Patents

Accurate liquid feeding device and method in PI resin production process Download PDF

Info

Publication number
CN114426149A
CN114426149A CN202210146978.3A CN202210146978A CN114426149A CN 114426149 A CN114426149 A CN 114426149A CN 202210146978 A CN202210146978 A CN 202210146978A CN 114426149 A CN114426149 A CN 114426149A
Authority
CN
China
Prior art keywords
buffer tank
control module
diaphragm pump
pneumatic diaphragm
feeding
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.)
Pending
Application number
CN202210146978.3A
Other languages
Chinese (zh)
Inventor
赵昕晖
赵彦平
赵康
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mingshi New Materials Co ltd
Original Assignee
Mingshi New Materials Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mingshi New Materials Co ltd filed Critical Mingshi New Materials Co ltd
Priority to CN202210146978.3A priority Critical patent/CN114426149A/en
Publication of CN114426149A publication Critical patent/CN114426149A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/008—Feed or outlet control devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/02—Large containers rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/12—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/48—Arrangements of indicating or measuring devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers

Abstract

The invention discloses a liquid precise feeding device and a liquid precise feeding method in a PI resin production process, and the device comprises a material container, a hundred-level laminar flow device, a pneumatic diaphragm pump, a buffer tank, a weighing device, a mass flow meter and a liquid distributor, wherein the pneumatic diaphragm pump is arranged at the top of the material container, the material container and the pneumatic diaphragm pump are both arranged in the hundred-level laminar flow device, the discharge end of the pneumatic diaphragm pump is connected with the buffer tank through a pipeline, the buffer tank is connected with the liquid distributor through a discharge pipeline, the liquid distributor is arranged in a reaction kettle, the mass flow meter is arranged on the discharge pipeline, and a control valve is arranged between the mass flow meter and the liquid distributor. According to the liquid accurate feeding device and the liquid accurate feeding method in the PI resin production process, due to the adoption of the structure, the cleanliness of feeding materials is guaranteed by adopting a hundred-level laminar flow device in the feeding part, and the rest parts are sealed and provided with clean protective gas, so that the building area is reduced, and the cost is reduced.

Description

Accurate liquid feeding device and method in PI resin production process
Technical Field
The invention relates to the technical field of PI resin production, in particular to a liquid accurate feeding device and a liquid accurate feeding method in a PI resin production process.
Background
The PI resin production process has high requirements on raw material cleanliness, feeding accuracy and dispersity, the raw material purity and the feeding cleanliness need to be controlled at a raw material end, the process needs to be controlled accurately, and the dispersion degree needs to be controlled for feeding to keep the production process stable.
Disclosure of Invention
The invention aims to provide a liquid accurate feeding device and a liquid accurate feeding method in a PI resin production process.
In order to achieve the purpose, the invention provides a liquid precise feeding device and a liquid precise feeding method in a PI resin production process, and the liquid precise feeding device comprises a material container, a hundred-grade laminar flow device, a pneumatic diaphragm pump, a buffer tank, a weighing device, a mass flow meter and a liquid distributor, wherein the pneumatic diaphragm pump is arranged at the top of the material container;
the buffer tank is arranged on the upper side of the placing platform, a first damping module and a second damping module are arranged between the buffer tank and the placing platform, and the weighing device is arranged between the first damping module and the second damping module;
the pneumatic diaphragm pump, the buffer tank, the mass flowmeter, the control valve and the weighing device are all electrically connected with the control module.
Preferably, a temperature sensor is further arranged in the reaction kettle, and the temperature sensor is electrically connected with the control module.
A feeding method of a liquid accurate feeding device in a PI resin production process comprises the following steps:
(1) putting the material container into the hundred-level laminar flow device, starting the hundred-level laminar flow device, opening the material container opening after the environment reaches the hundred level, and inserting a feed pipe of the pneumatic diaphragm pump into the bottom of the material container;
(2) opening a feed valve and a tail gas valve of the buffer tank through the control module, opening front and rear valves of the pneumatic diaphragm pump, starting the pneumatic diaphragm pump to feed, calculating a feed amount through the weighing device, inputting data into the control module through the weighing device to analyze and calculate, and closing the pneumatic diaphragm pump, the feed valve of the buffer tank and the tail gas valve through the control module when the feed amount reaches a set value;
(3) then opening the control valve and a protective gas valve of the buffer tank through the control module, enabling the material to enter the liquid distributor through the discharge pipeline, calculating the discharge amount of the buffer tank through a reduction method of the weighing device, transmitting data to the control module by the weighing device, transmitting mass flow data in the discharge pipeline to the control module by the mass flowmeter, and performing data analysis on the discharge amount data of the weighing device and the flow data of the mass flowmeter by the control module, wherein the difference between the two is regarded as qualified when the difference is 0.1%;
(4) and controlling the pressure of the protective gas in the buffer tank by controlling the air input of the protective gas valve so as to control the feeding speed of the material, and closing the control valve and the protective gas valve by the control module after the feeding is finished.
Preferably, the temperature sensor monitors the temperature in the reaction kettle in real time, the temperature sensor transmits temperature data to the control module, and the control module analyzes and processes the temperature data and then controls the feeding speed.
The invention has the beneficial effects that:
1. the feeding part adopts a hundred-grade laminar flow device, but not all devices are in a clean environment, and the rest parts are sealed and provided with clean protective gas, so that the building area is reduced, and the cost is reduced.
2. The weighing module is added at the buffer tank, and the numerical value of the mass flowmeter is rechecked by using a decrement method, so that the influence of unstable flow of the pneumatic diaphragm pump on the mass flowmeter is avoided.
3. The mass flow meter is matched with the control valve, and the control valve is electrically connected with the control module, so that automatic control can be realized.
4. The liquid distributor arranged in the reaction kettle can make the feeding material in a dispersed state, and the reaction uniformity is improved.
5. A temperature sensor is arranged in the reaction kettle, and the control valve is electrically connected with the control module and can control the feeding rate according to the temperature change in the reaction process.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a precise liquid feeding device and a feeding method in a PI resin production process according to the present invention;
FIG. 2 is a flow chart illustrating the control of a liquid precision feeding device in the PI resin production process according to the present invention.
Reference numerals:
1. a material container; 2. a hundred stage laminar flow device; 3. a pneumatic diaphragm pump; 4. a buffer tank; 5. a weighing device; 6. a mass flow meter; 7. a liquid distributor; 8. placing a platform; 9. a reaction kettle; 10. a first damping module; 11. and a second damping module.
Detailed Description
The present invention will be further described with reference to examples, in which various chemicals and reagents are commercially available unless otherwise specified.
Examples
Referring to fig. 1 to 2, as shown in the figures, a liquid precision feeding device in a PI resin production process includes a material container 1, a hundred-level laminar flow device 2, a pneumatic diaphragm pump 3, a buffer tank 4, a weighing device 5, a mass flow meter 6, a liquid distributor 7 and a temperature sensor, wherein the pneumatic diaphragm pump 3 is arranged at the top of the material container 1, the material container 1 and the pneumatic diaphragm pump 3 are both arranged in the hundred-level laminar flow device 2, a feeding portion adopts the hundred-level laminar flow device 2, but not all devices are in a clean environment, and the rest portions are sealed and provided with clean protective gas, so that the construction and operation costs are reduced.
The discharge end of the pneumatic diaphragm pump 3 is connected with the buffer tank 4 through a pipeline, the buffer tank 4 is connected with the liquid distributor 7 through a discharge pipeline, the liquid distributor 7 is arranged in the reaction kettle 9, the discharge pipeline is provided with the mass flow meter 6, and a control valve is arranged between the mass flow meter 6 and the liquid distributor 7; the buffer tank 4 is arranged on the upper side of the placing platform 8, a first damping module 10 and a second damping module 11 are arranged between the buffer tank 4 and the placing platform 8, and a weighing device 5 is arranged between the first damping module 10 and the second damping module 11; the weighing device 5 is additionally arranged at the position of the buffer tank 4, the numerical value of the mass flow meter 6 is rechecked by using a decrement method, meanwhile, the influence of unstable flow of the pneumatic diaphragm pump 3 on the mass flow meter 6 is avoided, the liquid distributor 7 can enable feeding to be in a dispersion state, and the uniformity of reaction is improved.
Pneumatic diaphragm pump 3, buffer tank 4, mass flow meter 6, control flap, weighing device 5 all with control module electric connection, still be equipped with temperature sensor in reation kettle 9, temperature sensor and control module electric connection realize feeding process's automatic control.
A feeding method of a liquid accurate feeding device in a PI resin production process comprises the following steps:
(1) putting a material container into a hundred-grade laminar flow device, starting the hundred-grade laminar flow device, opening a material container opening after the environment reaches hundred grades, and inserting a feeding pipe of a pneumatic diaphragm pump into the bottom of the material container;
(2) opening a feed valve and a tail gas valve of the buffer tank through the control module, opening front and rear valves of the pneumatic diaphragm pump, starting the pneumatic diaphragm pump to feed, calculating feed quantity through the weighing device, inputting data into the control module through the weighing device to analyze and calculate, and closing the pneumatic diaphragm pump, the feed valve and the tail gas valve of the buffer tank through the control module when the feed quantity reaches a set value;
(3) then opening a control valve and a protective gas valve of the buffer tank through a control module, enabling the materials to enter a liquid distributor through a discharge pipeline, calculating the discharge amount of the buffer tank through a decrement method of a weighing device, transmitting data to the control module by the weighing device, transmitting mass flow data in the discharge pipeline to the control module by a mass flowmeter, and performing data analysis on the discharge amount data of the weighing device and flow data of the mass flowmeter by the control module, wherein the difference between the two is regarded as qualified when the difference is 0.1%;
(4) the protective gas pressure in the buffer tank is controlled by controlling the air input of the protective gas valve, so that the feeding speed of materials is controlled, after feeding is finished, the control valve and the protective gas valve are closed through the control module, the temperature sensor monitors the temperature in the reaction kettle in real time, the temperature sensor transmits temperature data to the control module, and the control module controls the feeding speed after analyzing and processing the temperature data.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.

Claims (4)

1. The utility model provides an accurate feed arrangement of liquid in PI resin production process which characterized in that: the device comprises a material container, a hundred-level laminar flow device, a pneumatic diaphragm pump, a buffer tank, a weighing device, a mass flow meter and a liquid distributor, wherein the pneumatic diaphragm pump is arranged at the top of the material container, the material container and the pneumatic diaphragm pump are both arranged in the hundred-level laminar flow device, the discharge end of the pneumatic diaphragm pump is connected with the buffer tank through a pipeline, the buffer tank is connected with the liquid distributor through a discharge pipeline, the liquid distributor is arranged in a reaction kettle, the mass flow meter is arranged on the discharge pipeline, and a control valve is arranged between the mass flow meter and the liquid distributor;
the buffer tank is arranged on the upper side of the placing platform, a first damping module and a second damping module are arranged between the buffer tank and the placing platform, and the weighing device is arranged between the first damping module and the second damping module;
the pneumatic diaphragm pump, the buffer tank, the mass flowmeter, the control valve and the weighing device are all electrically connected with the control module.
2. The accurate liquid feeding device in the PI resin production process as claimed in claim 1, wherein: still be equipped with temperature sensor in the reation kettle, temperature sensor with control module electric connection.
3. The feeding method of the liquid precision feeding device in the PI resin production process as claimed in any one of claims 1 to 2, comprising the following steps:
(1) putting the material container into the hundred-level laminar flow device, starting the hundred-level laminar flow device, opening a material container opening after the environment reaches hundred levels, and inserting a feed pipe of the pneumatic diaphragm pump into the bottom of the material container;
(2) opening a feed valve and a tail gas valve of the buffer tank through the control module, opening front and rear valves of the pneumatic diaphragm pump, starting the pneumatic diaphragm pump to feed, calculating feed quantity through the weighing device, inputting data into the control module by the weighing device to analyze and calculate, and closing the pneumatic diaphragm pump, the feed valve of the buffer tank and the tail gas valve by the control module when the feed quantity reaches a set value;
(3) then opening the control valve and a protective gas valve of the buffer tank through the control module, enabling materials to enter the liquid distributor through the discharge pipeline, calculating the discharge amount of the buffer tank through a decrement method of the weighing device, transmitting data to the control module by the weighing device, transmitting mass flow data in the discharge pipeline to the control module by the mass flowmeter, and performing data analysis on the discharge amount data of the weighing device and the flow data of the mass flowmeter by the control module, wherein the difference between the two is regarded as qualified;
(4) and controlling the pressure of the protective gas in the buffer tank by controlling the air input of the protective gas valve so as to control the feeding speed of the material, and closing the control valve and the protective gas valve by the control module after the feeding is finished.
4. The feeding method of the liquid precise feeding device in the PI resin production process as claimed in claim 3, wherein: the temperature sensor monitors the temperature in the reaction kettle in real time, the temperature sensor transmits temperature data to the control module, and the control module analyzes and processes the temperature data and then controls the feeding speed.
CN202210146978.3A 2022-02-17 2022-02-17 Accurate liquid feeding device and method in PI resin production process Pending CN114426149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210146978.3A CN114426149A (en) 2022-02-17 2022-02-17 Accurate liquid feeding device and method in PI resin production process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210146978.3A CN114426149A (en) 2022-02-17 2022-02-17 Accurate liquid feeding device and method in PI resin production process

Publications (1)

Publication Number Publication Date
CN114426149A true CN114426149A (en) 2022-05-03

Family

ID=81313463

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210146978.3A Pending CN114426149A (en) 2022-02-17 2022-02-17 Accurate liquid feeding device and method in PI resin production process

Country Status (1)

Country Link
CN (1) CN114426149A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033108A1 (en) * 1980-09-03 1982-05-06 Degussa Ag, 6000 Frankfurt METHOD FOR FILLING SILO VEHICLES
CN202599508U (en) * 2012-05-24 2012-12-12 王飞 Electronic weighing device
CN107327537A (en) * 2017-09-04 2017-11-07 中国石油大学(华东) A kind of surge tank shock absorber
CN207413333U (en) * 2017-11-06 2018-05-29 宁波康曼丝涂料有限公司 A kind of proportioner
CN208731272U (en) * 2018-07-17 2019-04-12 鹤壁百运佳印务有限公司 A kind of Printing ink producing self-emptying meausring apparatus
CN210527364U (en) * 2019-09-27 2020-05-15 宁波锦莱化工有限公司 Isobutene buffer tank
CN211278490U (en) * 2019-07-04 2020-08-18 成都德力斯实业有限公司 Humidity control sealed glove box
CN213632357U (en) * 2020-12-02 2021-07-06 贵州荔波亿隆之家农业科技有限公司 Weighing device used in green plum wine production
CN214416371U (en) * 2020-11-30 2021-10-19 海南华盛新材料科技有限公司 Catalyst reaction kettle

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033108A1 (en) * 1980-09-03 1982-05-06 Degussa Ag, 6000 Frankfurt METHOD FOR FILLING SILO VEHICLES
CN202599508U (en) * 2012-05-24 2012-12-12 王飞 Electronic weighing device
CN107327537A (en) * 2017-09-04 2017-11-07 中国石油大学(华东) A kind of surge tank shock absorber
CN207413333U (en) * 2017-11-06 2018-05-29 宁波康曼丝涂料有限公司 A kind of proportioner
CN208731272U (en) * 2018-07-17 2019-04-12 鹤壁百运佳印务有限公司 A kind of Printing ink producing self-emptying meausring apparatus
CN211278490U (en) * 2019-07-04 2020-08-18 成都德力斯实业有限公司 Humidity control sealed glove box
CN210527364U (en) * 2019-09-27 2020-05-15 宁波锦莱化工有限公司 Isobutene buffer tank
CN214416371U (en) * 2020-11-30 2021-10-19 海南华盛新材料科技有限公司 Catalyst reaction kettle
CN213632357U (en) * 2020-12-02 2021-07-06 贵州荔波亿隆之家农业科技有限公司 Weighing device used in green plum wine production

Similar Documents

Publication Publication Date Title
CN204214881U (en) A kind of automatic quantitative liquid feeder
CN101514918B (en) Supplementary food weighing and metering control device
CN105844800A (en) Effluent metering system and effluent metering method of liquid vending machine
CN2702918Y (en) Automatic gas distribution apparatus
CN114426149A (en) Accurate liquid feeding device and method in PI resin production process
CN208313682U (en) A kind of volume fixing device for automatic dilution
CN217663145U (en) Online dilution system
CN203893906U (en) Standard metal measuring vessel with adjustable overflow liquid level
CN206919949U (en) A kind of oil-feed stable-pressure device in the measurement applied to engine consumption
CN205644786U (en) Liquid measurement system of machine is sold to liquid
CN109163777A (en) It is a kind of to monitor the small system and method for producing air volume and flow
CN201705637U (en) Quantitative delivery device of small-flow corrosive liquid
CN201097530Y (en) Greenhouse CO2 computer-controlled system
CN212513235U (en) Constant-elevation first-class metal measuring device standard device and liquid level control mechanism thereof
CN110608368B (en) Method for predicting switching time of oil head entering factory for long material conveying line and switching system
CN220824838U (en) Constant-speed feeding device
CN216208027U (en) High-precision dilution instrument
CN201163212Y (en) Material compensating and weighing control device
CN207662493U (en) A kind of online flowmeter prover
CN207362237U (en) A kind of stalk fermentation produces ethanol device
CN210495962U (en) Gas mixing device
CN212179971U (en) Control system for stably metering and correcting flow
CN212640492U (en) But fermentation cylinder of automatically regulated air input
CN213040320U (en) High-precision online weighing, metering and conveying system for wine
CN211697680U (en) Liquid adding mechanism for water quality analyzer

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
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20220503