CN114534633A - High-precision feeding and conveying control system - Google Patents
High-precision feeding and conveying control system Download PDFInfo
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- CN114534633A CN114534633A CN202210199178.8A CN202210199178A CN114534633A CN 114534633 A CN114534633 A CN 114534633A CN 202210199178 A CN202210199178 A CN 202210199178A CN 114534633 A CN114534633 A CN 114534633A
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- 239000007788 liquid Substances 0.000 claims abstract description 97
- 239000000376 reactant Substances 0.000 claims abstract description 73
- 239000007791 liquid phase Substances 0.000 claims abstract description 68
- 238000003860 storage Methods 0.000 claims abstract description 27
- 238000012546 transfer Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 19
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention discloses a high-precision feeding and conveying control system which comprises an opening and closing control valve, a high-precision flow meter and an active constant volume device, wherein the active constant volume device comprises a calibration container and a temporary storage container, and a liquid level measuring device is arranged in the calibration container; the calibration container is communicated with the temporary storage container through a first transfer pipeline, and the liquid-phase reactant in the calibration container is transferred into the reaction kettle through a second transfer pipeline. Compared with the traditional method, the invention records the liquid level height in the calibration container in real time, then takes the recorded liquid level height as the standard, and continues to adjust after the valve is closed, thereby reducing or even eliminating the error of the electromagnetic valve in the opening and closing process, ensuring that the amount of the liquid-phase reactant entering the reaction kettle is predicted to be as close as possible to the amount of the liquid-phase reactant actually entering the liquid-phase reaction kettle, and improving the precision of material conveying.
Description
Technical Field
The invention belongs to the technical field of biology, and particularly relates to a high-precision feeding and conveying control system.
Background
In the industrial production of oligo-nucleic acid, high-precision transmission needs to be carried out on raw materials and intermediate products, and the raw material amount entering a reaction kettle is guaranteed to be as accurate as possible, so that the situation that a large amount of raw materials or intermediate products exist in products generated by reaction due to residual reactants is avoided, the purification difficulty is improved, the production efficiency is reduced, and the production cost is improved.
In the prior art, a flow meter is used for monitoring the flow, a valve is controlled in real time, the opening and closing of a pipeline are realized, and the control of the amount of reactants entering a reaction kettle is realized, but in the method, because an electromagnetic valve has response delay, the reactants in the pipeline are influenced by gravity and self kinetic energy, and part of the reactants can continuously move into the reaction kettle after the electromagnetic valve is closed, and finally, the problem of poor precision of the flow meter exists, especially under the condition of low flow rate, so that the feeding accuracy of the reactants is improved, and the purity of reaction products is improved.
Disclosure of Invention
The invention aims to provide a high-precision feeding and conveying control system, which solves the problems that in the prior art, the feeding amount of raw materials or intermediate materials is inaccurate in the production process of oligonucleic acid, so that the complexity of components in a product after reaction is improved, the product is not easy to purify and separate, and raw materials are wasted.
The purpose of the invention can be realized by the following technical scheme:
a high-precision feeding and conveying control system comprises:
the opening and closing control valve is arranged on the transmission pipeline and controls the flow of fluid in the transmission pipeline through the opening and closing of the valve;
the high-precision flowmeter is used for monitoring the flow of the fluid in the transmission pipeline and transmitting the detection result to the controller in real time;
the active constant volume device comprises a calibration container and a temporary storage container, and a liquid level measuring device is arranged in the calibration container;
the calibration container is communicated with the temporary storage container through a first transfer pipeline, and the liquid-phase reactant in the calibration container is transferred into the reaction kettle through a second transfer pipeline.
As a further aspect of the invention, the system further comprises a pressure regulating valve, the pressure regulating valve being mounted on the transport conduit.
As a further scheme of the invention, a stabilizing panel is arranged in the calibration container, the stabilizing panel is arranged in parallel with the liquid level in the calibration container, a plurality of meshes are arranged on the stabilizing panel, two or more layers of stabilizing panels are arranged, and a gap is left between two adjacent layers of stabilizing panels.
As a further scheme of the invention, two liquid level measuring devices are arranged in the calibration container, one is used for monitoring the high-level liquid level W1 in the calibration container, the other is used for monitoring the low-level liquid level W2 in the calibration container, and when the liquid level in the calibration container reaches the low-level liquid level W2, the transfer of the liquid-phase reactant in the calibration container is stopped.
As a further scheme of the invention, a discharge outlet is arranged on the temporary storage container, and an electromagnetic valve is arranged on the discharge outlet.
As a further aspect of the present invention, the liquid-phase reactant having the predetermined liquid level height in the temporary storage container is maintained while the liquid-phase reactant in the temporary storage container is pumped out.
As a further aspect of the present invention, the operating method of the control system includes the steps of:
s1, continuously introducing the liquid phase reactant into the calibration container, and stopping continuously introducing the liquid phase reactant when a liquid level measuring device for monitoring the high-level liquid level of the calibration container sends a liquid level signal;
s2, opening an electromagnetic valve on the transmission pipeline, introducing a liquid-phase reactant into the calibration container through the transmission pipeline, simultaneously opening a valve on the second transfer pipeline, and introducing the liquid-phase reactant in the calibration container into the reaction kettle, wherein the liquid level in the calibration container is always in a W1 +/-alpha range through adjustment in the process, wherein W1 is the height of a high-level liquid level in the calibration container, and alpha is a preset value;
s3, monitoring the flow of the liquid phase reactant transmitted in the transmission pipeline through the high-precision flow meter, recording the level value W recorded by the liquid level measuring device for monitoring the high level liquid level of the calibration container when the flow reaches a preset value, closing the valve on the second transfer pipeline and the electromagnetic valve on the transmission pipeline, and introducing a corresponding amount of liquid phase reactant into the reaction kettle through the calibration container according to the difference between the level value W and the high level liquid level W1 of the calibration container.
As a further scheme of the present invention, after stopping the continuous introduction of the liquid phase reactant into the calibration container in step S1, the controller detects the liquid level signal of the liquid level measuring device, when the difference between the actual liquid level value and the high level liquid level W1 is less than the preset value, the controller directly proceeds to the next step, when the difference between the actual liquid level value and the high level liquid level W1 is greater than or equal to the preset value, the controller controls the corresponding valve to open, the liquid phase reactant in the calibration container is removed by controlling the opening of the valve until the corresponding liquid level measuring device sends out the liquid level signal again, the controller controls the corresponding valve to close, and the continuous introduction of the liquid phase reactant is stopped.
The invention has the beneficial effects that:
compared with the traditional method, the method takes the flow information acquired by the high-precision flowmeter as the reference, records the liquid level height in the calibration container in real time, then continues to adjust after the valve is closed on the basis of the recorded liquid level height, can reduce or even eliminate the error of the electromagnetic valve in the switching process, ensures that the amount of the liquid-phase reactant expected to enter the reaction kettle is as close as possible to the actual amount of the liquid-phase reactant entering the liquid-phase reaction kettle, and improves the precision of material conveying.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an active volumetric apparatus;
in the figure: 1. calibrating the container; 2. a flow returning sleeve; 3. a transport pipeline; 4. a liquid level measuring device; 6. a second transfer conduit; 7. a first transfer conduit; 8. a discharge outlet; 9. a temporary storage container.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A high-precision feeding and conveying control system,
the device comprises a pressure regulating valve, wherein the pressure regulating valve is arranged on a transmission pipeline 3 and is used for stabilizing the flow of the fluid conveyed in the pipeline so as to ensure the accuracy of flow measurement and control;
the opening and closing control valve is arranged on the transmission pipeline 3, and the flow of the fluid in the transmission pipeline 3 is controlled through the opening degree and the closing of the opening and closing control valve;
the high-precision flowmeter is used for monitoring the flow of the fluid in the transmission pipeline 3 and transmitting the detection result to the controller in real time;
the active constant volume device is used for accurately controlling the flow of reactants entering the reaction kettle;
as shown in fig. 1, the active constant volume device includes a calibration container 1 and a temporary storage container 9;
a liquid level measuring device 4 is arranged in the calibration container 1, the liquid level measuring device 4 is used for measuring the liquid level in the calibration container 1, and specifically, when the liquid level measuring device 4 detects that the liquid level reaches a certain preset value, a liquid level signal is transmitted to the controller;
in order to reduce the liquid level detection error, a stable panel can be added in the calibration container 1, the stable panel is arranged in parallel with the liquid level in the calibration container 1, and it should be noted that the liquid level in the calibration container 1 refers to the liquid level in a static state;
the stabilizing panel is provided with a plurality of meshes, so that the flow of reactant liquid up and down the stabilizing panel is not influenced, preferably, the stabilizing panel is provided with two or more layers, and a certain gap is reserved between two adjacent layers of stabilizing panels;
the structure can ensure that the liquid level in the calibration container 1 is relatively stable and does not generate obvious and violent fluctuation when liquid-phase reactants are input into the calibration container 1 through a pipeline, thereby ensuring the accuracy of the measurement result of the liquid level measurement device 4;
the liquid-phase reactant in the calibration container 1 can be transferred to the temporary storage container 9 through the first transfer pipeline 7, and the liquid-phase reactant in the calibration container 1 can be transferred to the reaction kettle through the second transfer pipeline 6, and it should be noted that the reaction kettle is a reaction kettle of a reaction system in which the liquid-phase reactant participates;
it should be noted that when the liquid-phase reactant in the calibration container 1 is pumped out, it is necessary to avoid completely pumping out the liquid-phase reactant therein, which causes gas to mix in the pipeline and affects the accuracy of the instruments such as the flow meter, and in order to improve this situation, two liquid level measuring devices 4 may be disposed in the calibration container 1, one for monitoring the high level liquid level W1 in the calibration container 1 and one for monitoring the low level liquid level W2 in the calibration container 1;
preferably, the liquid level in the calibration container 1 can be calibrated by transferring the liquid-phase reactant in the temporary storage container 9 into the calibration container 1 through a pump;
in one embodiment of the invention, the accuracy of liquid level positioning of the liquid level measuring devices 4 can be effectively improved by reducing the diameters of the calibration container 1 at the positions of the two liquid level measuring devices 4;
the temporary storage container 9 is used for transferring the liquid-phase reactant in the calibration container 1, so that the liquid level height in the calibration container 1 can be accurately adjusted within a certain range, the temporary storage container 9 is provided with a discharge outlet 8 capable of discharging the liquid-phase reactant in the temporary storage container 9, the discharge outlet 8 is provided with an electromagnetic valve, the liquid-phase reactant in the temporary storage container 9 can be discharged by controlling the opening and closing of the electromagnetic valve on the discharge outlet 8, the amount of the liquid-phase reactant in the temporary storage container 9 is ensured not to exceed a set value, and the liquid-phase reactant in the temporary storage container 9 has a good effect of receiving the liquid-phase reactant all the time;
in one embodiment of the present invention, the liquid-phase reactant in the temporary storage container 9 can be pumped by gravity or a pump, and the pumping of the liquid-phase reactant in the temporary storage container 9 by the pump can increase the pumping speed of the liquid-phase reactant;
it should be noted that, when the liquid-phase reactant in the temporary storage container 9 is pumped out, the liquid-phase reactant with a certain liquid level in the temporary storage container 9 is always maintained to avoid emptying, so that a large amount of gas and the liquid-phase reactant can be effectively prevented from being mixed together when the liquid-phase reactant in the temporary storage container 9 is pumped out;
the method for carrying out high-precision feeding and conveying through the active constant volume device comprises the following steps:
s1, continuously introducing the liquid phase reactant into the calibration container 1, and when the liquid level measuring device 4 for monitoring the high-level liquid level of the calibration container 1 sends a liquid level signal, the controller controls the corresponding valve to be closed, and stops the continuous introduction of the liquid phase reactant;
s2, opening an electromagnetic valve on the transmission pipeline 3, introducing a liquid-phase reactant into the calibration container 1 through the transmission pipeline 3, simultaneously opening a valve on the second transfer pipeline 6, and introducing the liquid-phase reactant in the calibration container 1 into the reaction kettle, wherein the liquid level in the calibration container 1 is always in a W1 +/-alpha range through adjustment in the process, wherein W1 is the height of a high-level liquid level in the calibration container 1, and alpha is a preset value;
s3, monitoring the flow of the liquid phase reactant transmitted in the transmission pipeline 3 through the high-precision flow meter, recording the level value W recorded by the liquid level measuring device 4 for monitoring the high level liquid level of the calibration container 1 when the flow reaches a preset value, closing the valve on the second transmission pipeline 6 and the electromagnetic valve on the transmission pipeline 3, and introducing a corresponding amount of liquid phase reactant into the reaction kettle through the calibration container 1 according to the difference between the level value W and the high level liquid level W1 of the calibration container 1.
Because the opening and closing of the electromagnetic valve have a process, a certain amount of liquid-phase reactants can pass through the electromagnetic valve in the process, so that the amount of the liquid-phase reactants which actually pass through the electromagnetic valve is different from the amount of the liquid-phase reactants which are expected to pass through the electromagnetic valve;
the method takes the flow information acquired by the high-precision flowmeter as the standard, records the liquid level height in the calibration container 1 in real time, then takes the recorded liquid level height as the standard, and continues to adjust after the valve is closed.
In one embodiment of the present invention, in order to improve the accuracy of the liquid level calibration in step S1, the specific method after the liquid level measuring device 4 sends a liquid level signal and the controller controls the corresponding valve to close and stops the continuous introduction of the liquid phase reactant is as follows:
then the controller monitors the liquid level signal of the liquid level measuring device 4, when the difference value between the actual liquid level value and the liquid level value corresponding to the liquid level signal is smaller than the preset value, the next step is directly carried out, when the difference value between the actual liquid level value and the liquid level value corresponding to the liquid level signal is larger than or equal to the preset value, the controller controls the corresponding valve to be opened, the liquid phase reactant in the calibration container 1 is slowly discharged by controlling the opening of the valve until the corresponding liquid level measuring device 4 sends out the liquid level signal again, the controller controls the corresponding valve to be closed, and the continuous introduction of the liquid phase reactant is stopped;
in an embodiment of the present invention, the calibration container 1 is fixedly sleeved on one end of a discharge port of the transmission pipeline 3, the discharge port of the transmission pipeline 3 is sleeved with a backflow sleeve 2, the backflow sleeve 2 is a cylindrical structure with an open end, and can change a flow direction of a liquid phase reactant to guide the liquid phase reactant into the calibration container 1, a liquid level measuring device 4 is arranged in the calibration container 1, and the calibration container 1 is arranged in a closed structure, that is, the calibration container 1 wraps the backflow sleeve 2 and an outlet end of the calibration container 1, so that the liquid phase reactant can be prevented from contacting with air (in case of relevant requirements) by introducing nitrogen gas and the like into the calibration container 1.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A high accuracy is thrown and is expected conveying control system which characterized in that includes:
the opening and closing control valve is arranged on the transmission pipeline (3) and controls the flow of fluid in the transmission pipeline (3) through the opening and closing of the valve;
the high-precision flowmeter is used for monitoring the flow of the fluid in the transmission pipeline (3) and transmitting the detection result to the controller in real time;
the active constant volume device comprises a calibration container (1) and a temporary storage container (9), and a liquid level measuring device (4) is arranged in the calibration container (1);
the calibration container (1) is communicated with the temporary storage container (9) through a first transfer pipeline (7), and the liquid-phase reactant in the calibration container (1) is transferred into the reaction kettle through a second transfer pipeline (6).
2. A high precision dosing and delivery control system according to claim 1, further comprising a pressure regulating valve mounted on the transfer pipe (3).
3. A high-precision feeding and conveying control system as claimed in claim 1, wherein a stabilizing panel is arranged in the calibration container (1), the stabilizing panel is arranged in parallel with the liquid level in the calibration container (1), a plurality of meshes are arranged on the stabilizing panel, the stabilizing panel is provided with two or more layers, and a gap is left between two adjacent layers of stabilizing panels.
4. A high accuracy feeding and conveying control system according to claim 1, characterized in that two liquid level measuring devices (4) are arranged in the calibration container (1), one is used for monitoring the high level W1 in the calibration container (1), and the other is used for monitoring the low level W2 in the calibration container (1), and when the liquid level in the calibration container (1) reaches the low level W2, the transfer of the liquid phase reactant in the calibration container (1) is stopped.
5. A high accuracy feeding and conveying control system according to claim 4, characterized in that the temporary storage container (9) is provided with a discharging outlet (8), and the discharging outlet (8) is provided with an electromagnetic valve.
6. A high accuracy feeding and conveying control system according to claim 5, characterized in that when the liquid phase reactant in the temporary storage container (9) is pumped out, the liquid phase reactant in the temporary storage container (9) is kept at a preset liquid level.
7. A high precision feeding and conveying control system according to claim 6, characterized in that the working method of the control system comprises the following steps:
s1, continuously introducing the liquid phase reactant into the calibration container (1), and stopping continuously introducing the liquid phase reactant when a liquid level measuring device (4) for monitoring the high-level liquid level of the calibration container (1) sends a liquid level signal;
s2, opening an electromagnetic valve on a transmission pipeline (3), introducing a liquid-phase reactant into the calibration container (1) through the transmission pipeline (3), simultaneously opening a valve on a second transfer pipeline (6), and introducing the liquid-phase reactant in the calibration container (1) into a reaction kettle, wherein the liquid level in the calibration container (1) is always in a W1 +/-alpha range through adjustment in the process, wherein W1 is the height of a high-level liquid level in the calibration container (1), and alpha is a preset value;
s3, monitoring the flow of the liquid phase reactant transmitted in the transmission pipeline (3) through the high-precision flow meter, recording a liquid level value W recorded by the liquid level measuring device (4) for monitoring the high-level liquid level of the calibration container (1) when the flow reaches a preset value, closing a valve on the second transfer pipeline (6) and an electromagnetic valve on the transmission pipeline (3) at the same time, and then introducing a corresponding amount of liquid phase reactant into the reaction kettle through the calibration container (1) according to the difference between the liquid level value W and the high-level liquid level W1 of the calibration container (1).
8. A high accuracy feeding and conveying control system as claimed in claim 7, characterized in that in step S1, after stopping the continuous introduction of the liquid phase reactant into the calibration container (1), the controller detects the liquid level signal of the liquid level measuring device (4), when the difference between the actual liquid level value and the high level W1 is less than the preset value, the next step is directly proceeded, when the difference between the actual liquid level value and the high level W1 is greater than or equal to the preset value, the controller controls the corresponding valve to open, the liquid phase reactant in the calibration container (1) is removed by controlling the valve opening, until the corresponding liquid level measuring device (4) sends out the liquid level signal again, and the controller controls the corresponding valve to close, and the continuous introduction of the liquid phase reactant is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210199178.8A CN114534633A (en) | 2022-03-02 | 2022-03-02 | High-precision feeding and conveying control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210199178.8A CN114534633A (en) | 2022-03-02 | 2022-03-02 | High-precision feeding and conveying control system |
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| CN114534633A true CN114534633A (en) | 2022-05-27 |
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| CN202210199178.8A Pending CN114534633A (en) | 2022-03-02 | 2022-03-02 | High-precision feeding and conveying control system |
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Citations (9)
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|---|---|---|---|---|
| EP0278946A1 (en) * | 1987-02-10 | 1988-08-17 | Dietrich Kastner | Apparatus for determining the mass of pumpable and flowable foods, especially milk |
| JPH0858894A (en) * | 1994-08-23 | 1996-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Liquid transfer device |
| CN103285775A (en) * | 2013-05-24 | 2013-09-11 | 陕西科技大学 | Belt-pressure high-precision quantitative feeding system |
| CN104406663A (en) * | 2014-12-16 | 2015-03-11 | 中国科学院合肥物质科学研究院 | Liquid metal flow calibration container |
| CN105526997A (en) * | 2015-12-29 | 2016-04-27 | 中国原子能科学研究院 | Calibration container, calibration circuit and calibration method of liquid metal flow gauge |
| CN109827644A (en) * | 2019-04-01 | 2019-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | The metering system and method for the pre- nitration mixture mine of continuous acidolysis |
| CN210804125U (en) * | 2019-12-26 | 2020-06-19 | 内蒙古通威高纯晶硅有限公司 | Static pressure type liquid level control system |
| CN214439066U (en) * | 2021-03-01 | 2021-10-22 | 吴江市天利聚合物有限公司 | Reation kettle with flow monitoring device |
| CN214810692U (en) * | 2021-07-09 | 2021-11-23 | 山东天安化工股份有限公司 | Liquid material dripping device |
-
2022
- 2022-03-02 CN CN202210199178.8A patent/CN114534633A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0278946A1 (en) * | 1987-02-10 | 1988-08-17 | Dietrich Kastner | Apparatus for determining the mass of pumpable and flowable foods, especially milk |
| JPH0858894A (en) * | 1994-08-23 | 1996-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Liquid transfer device |
| CN103285775A (en) * | 2013-05-24 | 2013-09-11 | 陕西科技大学 | Belt-pressure high-precision quantitative feeding system |
| CN104406663A (en) * | 2014-12-16 | 2015-03-11 | 中国科学院合肥物质科学研究院 | Liquid metal flow calibration container |
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| CN210804125U (en) * | 2019-12-26 | 2020-06-19 | 内蒙古通威高纯晶硅有限公司 | Static pressure type liquid level control system |
| CN214439066U (en) * | 2021-03-01 | 2021-10-22 | 吴江市天利聚合物有限公司 | Reation kettle with flow monitoring device |
| CN214810692U (en) * | 2021-07-09 | 2021-11-23 | 山东天安化工股份有限公司 | Liquid material dripping device |
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Address after: No. 36, Yanggang Avenue, Shitan Industrial Park, Shizi Town, Quanjiao County, Chuzhou City, Anhui Province 239500 Applicant after: Anhui Ruibai Pharmaceutical Co.,Ltd. Address before: 239500 room 511, building 6, Rulin Road Government Service Center, Xianghe Town, Quanjiao County, Chuzhou City, Anhui Province Applicant before: General Biology (Chuzhou) Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220527 |