CN107491007B - Miniature constant-current solution feeding system for laboratory and control method - Google Patents
Miniature constant-current solution feeding system for laboratory and control method Download PDFInfo
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- CN107491007B CN107491007B CN201710738577.6A CN201710738577A CN107491007B CN 107491007 B CN107491007 B CN 107491007B CN 201710738577 A CN201710738577 A CN 201710738577A CN 107491007 B CN107491007 B CN 107491007B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24024—Safety, surveillance
Abstract
The invention discloses a laboratory miniature constant-current solution feeding system and a control method, wherein the system comprises a storage device, an injection pump device for continuous and stable high-precision feeding and a display screen, the injection pump device comprises a plurality of groups of injectors and a controller, the plurality of groups of injectors are connected with the controller, and the display screen is connected with the controller; each group of injectors is provided with a three-way valve, and the storage device is connected with the three-way valve corresponding to each group of injectors through a feed pipeline; the controller comprises a 485 communication interface, a temperature sensor interface, a liquid level sensor interface, an Ethernet interface, a relay, a display screen interface, a WIFI module and a 433MHz wireless module. The technical scheme of the invention can conveniently control the feeding system remotely and wirelessly.
Description
Technical Field
The invention relates to the technical field of feeding systems, in particular to a miniature constant-current solution feeding system in a laboratory and a control method.
Background
The traditional laboratory constant-current feeding system adopts a material tank-peristaltic pump system and a material tank-gear pump system, and the solvent flow can be regulated by the peristaltic pump or the gear pump at any time so as to meet the experimental requirements, save a great deal of time for experiments, save a great deal of manpower, material resources and financial resources, and have the advantages of self-evident and avoiding misoperation in the experimental process. However, the above two systems have the following problems to influence the constant flow effect of the solvent: (1) Due to the working characteristics of the peristaltic pump, the peristaltic pump has the pulse problem in flow control, so that the interference of experiments and the influence of frequent extrusion of rubber pipes on feeding and loss are increased; (2) The gear pump has inconsistent flow rate under the same rotating speed due to individual difference of the processing technology, and a glass rotameter is additionally arranged to stabilize the flow rate.
The injection pump has no pulse problem, can provide stable and high-precision flow, can realize continuous feeding by alternately working the multi-stage injection pump, and is used for a miniature constant-current solvent feeding system in a laboratory; the common injection pump does not have the functions of cooperative work of the multistage injection pump and remote control injection, and an operator is required to set and operate the injection pump on site, and solvents in chemical experiments are inflammable, explosive, radioactive and toxic and harmful to the operator.
The injection pump which can be remotely controlled and appears on the market usually uses a remote controller to remotely control or uses a long special wire to connect the injection pump and a console to remotely control, the system has great limitation on the distance between operators and the injection pump, and if multi-channel injection is needed at the same time, great inconvenience is brought to operation.
When some severe experimental conditions require a high-precision pulsation-free device, other feeding equipment cannot meet the use requirements, such as a dynamic extraction device.
Disclosure of Invention
The invention mainly aims to overcome the defects and shortcomings of the prior art, and provides a miniature constant-current solvent feeding system and a control method for a laboratory, which can remotely and wirelessly control the feeding system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention discloses a laboratory miniature constant-current solution feeding system, which comprises a storage device, an injection pump device for continuous and stable high-precision feeding and a display screen, wherein the injection pump device comprises a plurality of groups of injectors and a controller, the plurality of groups of injectors are connected with the controller, and the display screen is connected with the controller; each group of injectors is provided with a three-way valve, and the storage device is connected with the three-way valve corresponding to each group of injectors through a feed pipeline; the controller is used for controlling the flow rate, the temperature and the liquid level of the solution, and comprises a 485 communication interface, a temperature sensor interface, a liquid level sensor interface, an Ethernet interface, a relay, a display screen interface, a WIFI module and a 433MHz wireless module, wherein the 485 communication interface of the controller is connected with the plurality of groups of injectors, the display screen interface is connected with the display screen, and the Ethernet interface is connected with the Ethernet; the WIFI module is connected with the WIFI wireless router through wireless; the 433MHz wireless module is connected with the 433MHz wireless gateway through the 433MHz wireless network.
As an optimal technical scheme, the 485 communication interface is connected with the plurality of groups of injectors through 2 groups of signal wires; the display screen interface is connected with the display screen through 4 groups of signal lines; the Ethernet interface is connected with the Ethernet through 4 groups of signal wires.
As an optimal technical scheme, a liquid level sensor for monitoring and alarming the liquid level of the storage device in real time is arranged in the storage device, and the liquid level sensor is connected with a liquid level sensor interface of the controller.
As the preferable technical scheme, the device also comprises a filtering device for filtering the solution conveyed by the storage device, one end of the filtering device is connected with the storage device through a feeding pipeline, and the other end of the filtering device is connected with a three-way valve corresponding to the injector through the feeding pipeline.
As a preferable technical scheme, a filter is arranged in the filtering device and is used for filtering out impurities in the solution.
As an optimal technical scheme, a heater is arranged at the bottom of the filtering device, the heater is controlled by a relay, and the relay is connected with the controller through 3 groups of signal wires; the bottom of the filtering device is provided with a temperature sensor for detecting the temperature of the solution, and the temperature sensor is connected with the controller through a temperature sensor interface.
As a preferable technical scheme, the controller sends switch instructions to three-way valves of a plurality of groups of injectors, and the three-way valves are two and used for controlling the flow direction of the solution and ensuring the continuity of feeding; the two three-way valves are opened and closed in turn, and if one three-way valve is feeding, the other three-way valve is discharging.
As the preferable technical scheme, the display screen is a liquid crystal touch display screen, and can realize the switching between local control and remote control, the setting of liquid level high and low positions and alarm, temperature setting, display and alarm, temperature linear correction and solvent heating setting.
The invention also discloses a feeding method of the miniature constant-current solution feeding system in the laboratory, which comprises the following steps:
s1, setting feeding information through remote or local operation, wherein the feeding information comprises liquid level high and low positions, temperature and flow rate; if the remote setting is selected, the feeding information is transmitted to a controller of the injection pump device through an Ethernet, a WIFI router or a 433 wireless network; if the local setting is selected, the feeding information is transmitted to a controller of the injection pump device through 4 groups of signal lines;
s2, after receiving the injection information, a controller transmits the set temperature information to a temperature sensor, the temperature sensor monitors the solution in the filtering device in real time, the filtering device is used for filtering the solution provided by the storage device, the controller transmits the set liquid level information to a liquid level sensor, and the liquid level sensor monitors the liquid level of the solution in the storage device in real time;
and S3, feeding back monitoring results to the controller in real time by the temperature sensor and the liquid level sensor, and remotely feeding back the monitoring results to a remote computer or a local display screen to realize the real-time monitoring of injection of multiple groups of injectors remotely or locally.
In step S1, when selecting remote setting, an operator sets a feeding parameter on a computer, and the feeding parameter is transmitted to an ethernet interface, a WIFI module, or a 433MHz wireless module of the controller through an ethernet, a WIFI router, or a 433 wireless network; the controller receives the feeding parameter through ethernet interface, WIFI module, or 433MHz wireless module, and the 485 communication interface of controller passes through 2 sets of signal lines with feeding speed transmission to multiunit syringe, and the controller passes through temperature sensor interface with temperature information transmission to temperature sensor, and temperature sensor monitors real-time temperature, if the temperature does not reach the setting temperature, the controller passes through the relay and opens the heater, and the controller passes through liquid level sensor interface with liquid level information transmission to liquid level sensor, liquid level sensor real-time supervision liquid level height.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The invention can be remotely and wirelessly operated, completely realizes man-machine isolation, and avoids the injury of toxic, harmful, inflammable, explosive and even radioactive solvents to operators;
(2) The liquid level and temperature sensor can monitor and alarm the liquid level and the liquid temperature of the material tank in real time;
(3) The injection pump has high feeding precision and can be connected with uninterrupted feeding;
(4) The injection pump can be connected in parallel at will through multiple stages, so that the flow range of the feeding system is changed, and the requirements of users are met;
(5) The invention supports local/remote parameter setting for syringe pumps: the number, the size and the output flow of the injection pumps.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a schematic diagram of a controller according to the present invention;
FIG. 3 is a schematic view of a multi-set syringe connection of the present invention
FIG. 4 is a circuit diagram of the Ethernet portion of the controller of the invention;
FIG. 5 is a circuit diagram of a sensor data acquisition portion of the controller of the present invention;
FIG. 6 is a diagram of the WIFI wireless portion and 433MHz radio circuit of the controller of the present invention;
fig. 7 is a circuit diagram of power management and RS485 communication of the controller of the present invention.
Reference numerals illustrate: 1. a syringe pump means; 2. a filtering device; 3. a storage device; 4. a display screen; 5. a liquid level sensor; 6. a temperature sensor; 7. a heater; 8. a syringe A;9 a syringe B; 10. a three-way valve A; 11. and a three-way valve B.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
As shown in fig. 1 and 2, the micro constant-current solvent feeding system in the laboratory of the present embodiment includes a syringe pump device 1, a storage device 3, a display screen 4, and a liquid level sensor 5, where the syringe pump device 1 includes multiple groups of syringes and a controller, the multiple groups of syringes are connected with the controller, and the display screen 4 is connected with the controller; each group of injectors is provided with a three-way valve, and the material storage device 3 is connected with the corresponding three-way valve of each group of injectors through a material supply pipeline. The storage device 3 is internally provided with a liquid level sensor 5 for monitoring and alarming the liquid level of the storage device in real time, and the liquid level sensor is connected with a liquid level sensor interface of the controller.
As a more preferable solution of this embodiment, the above feeding system is further provided with a filtering device 2 for filtering the solution conveyed by the storage device, where one end of the filtering device 2 is connected with the storage device 3 through a feeding pipeline, and the other end is connected with a three-way valve corresponding to the injector through the feeding pipeline. The filter device is internally provided with a filter for filtering out impurities in the solution. The bottom of the filtering device 2 is provided with a heater 7, the heater 7 is controlled by a relay, and the relay is connected with the controller through 3 groups of signal wires. The bottom of the filtering device is provided with a temperature sensor 6 for detecting the temperature of the solution, and the temperature sensor is connected with the controller through a temperature sensor interface.
In this embodiment, the syringe pump device includes two sets of syringe pumps and a controller, the controller issues a switch command to three-way valves of the multiple sets of syringes, and the three-way valves are two and are used for controlling the flow direction of the solution and ensuring the continuity of the feeding; the two three-way valves are opened and closed in turn, if one three-way valve is feeding, the other three-way valve is discharging, as shown in fig. 3, the injector A8 is connected with the three-way valve A10, the injector B9 is connected with the three-way valve B11, and the three-way valve A and the three-way valve B are controlled by a controller.
In this embodiment, the controller includes 485 communication interface, power interface, temperature sensor interface, level sensor interface, ethernet interface, relay, display screen interface, WIFI module and 433MHz wireless module.
The 485 communication interface of controller pass through 2 sets of signal lines with the syringe pump is connected, the controller pass through the temperature sensor interface with temperature sensor connects, the controller pass through the liquid level sensor interface with level sensor connects, the display screen interface passes through 4 sets of signal lines and is connected with the display screen, the ethernet interface passes through 4 sets of signal lines and is connected with the ethernet, the relay passes through 3 sets of signal lines and is connected with the heater, the WIFI module passes through wireless and WIFI wireless router to be connected, 433MHz wireless module passes through 433MHz wireless network and 433MHz wireless gateway to be connected.
The liquid level sensor 5 monitors and alarms the liquid level of the storage device in real time, the temperature sensor monitors and alarms the temperature of the solvent in the filtering device in real time, the relay controls the switch of the heater, and the WIFI and 433MHz wireless module is used for realizing wireless remote operation of the injection pump.
The display screen 4 can realize the switching between local control and remote control, the liquid level high-low position setting and alarming, the temperature setting, the displaying and alarming, the temperature linear correction and the solvent heating.
As shown in fig. 4, the ethernet communication module is connected to the master control module MCU by the RMII mode before communicating, and the communication mode only occupies a small number of I/O interfaces of the MCU.
As shown in fig. 5, a PT100 acquisition circuit amplifies a signal by an LM2904 operational amplifier, and then is connected to a main control chip, wherein L3 in the acquisition circuit is a power inductor, which plays a role in filtering, reduces the influence of level change on the acquired signal, and C32 is a filter capacitor.
As shown in fig. 6, the WIFI wireless module adopts an EMW3165WIFI module of Shanghai celebration information technology limited company, and communicates with the main control chip through a serial port. The WIFI module integrates a wireless radio frequency chip and a Cortex-M4 microcontroller, is internally provided with a self-hoted WIFI network function library and an application component, and comprises 22 GPIO pins and JTAG/SWD debugging interfaces. The WIFI module supports the 802.11b/g/n standard, the receiving sensitivity is-87 dBm, and easy link is supported. In the figure, R1, R2 and R5 are isolation resistors, and R4 is an indicator lamp pull-up resistor. The 433MHz wireless module adopts an IM433 wireless module provided by Shenyang Automation research institute Guangzhou, works in 433MHz frequency band, and can realize wireless transmission function of data by communicating with the main control chip through a TTL serial port.
As shown in FIG. 7, the power management part circuit mainly converts an industrial 24V direct current power supply into a system power supply, and is compatible with 12V direct current power supply. Voltage conversion was performed by TPS5430 high performance DC/DC buck chip from TI. AMS was used to convert 5V to 3.3V and B_S-1W was an analog digital power isolation chip. The ratio of resistors R60 and R61 in the figure can realize the output voltage value adjustment.
The RS485 interface is connected with the serial port of the main control chip through an ADM2486 chip, and the ADM2486 is used for converting serial port signals and RS485 signals. The resistors R62, R65 and R67 are added to the RS485 output end to perform impedance matching on the output end, so that common mode signal interference is restrained, and the integrity of differential signals is maintained. And the output end is subjected to isolation voltage overvoltage protection treatment through the TVS diode at the output end, so that the board-level circuit is prevented from being damaged by static electricity.
The embodiment also provides a feeding method of the miniature constant-current solvent feeding system in the laboratory, which comprises the following steps:
s1, setting feeding information through remote or local operation, wherein the feeding information comprises liquid level high and low positions, temperature and flow rate; if the remote setting is selected, the feeding information is transmitted to a controller of the injection pump device through an Ethernet, a WIFI router or a 433 wireless network; if the local setting is selected, the feeding information is transmitted to a controller of the injection pump device through 4 groups of signal lines;
s2, after receiving the injection information, a controller transmits the set temperature information to a temperature sensor, the temperature sensor monitors the solution in the filtering device in real time, the filtering device is used for filtering the solution provided by the storage device, the controller transmits the set liquid level information to a liquid level sensor, and the liquid level sensor monitors the liquid level of the solution in the storage device in real time;
and S3, feeding back monitoring results to the controller in real time by the temperature sensor and the liquid level sensor, and remotely feeding back the monitoring results to a remote computer or a local display screen to realize the real-time monitoring of injection of multiple groups of injection pumps remotely or locally.
In step S1, when selecting remote setting, an operator sets a feeding parameter on a computer, and the feeding parameter is transmitted to an ethernet interface, a WIFI module, or a 433MHz wireless module of the controller through an ethernet, a WIFI router, or a 433 wireless network; the controller receives the feeding parameter through ethernet interface WIFI module, or 433MHz wireless module, and the 485 communication interface of controller passes through 2 sets of signal lines with feeding speed transmission to multiunit syringe, and the controller passes through temperature sensor interface with temperature information transmission to temperature sensor, and temperature sensor monitors real-time temperature, if the temperature does not reach the setting temperature, the controller passes through the relay and opens the heater, and the controller passes through liquid level sensor interface with liquid level information transmission to liquid level sensor, liquid level sensor real-time supervision liquid level height.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (7)
1. The miniature constant-current solution feeding system for the laboratory is characterized by comprising a storage device, an injection pump device for continuous, stable and high-precision feeding and a display screen, wherein the injection pump device comprises a plurality of groups of injectors and a controller, the plurality of groups of injectors are connected with the controller, and the display screen is connected with the controller; each group of injectors is provided with a three-way valve, and the storage device is connected with the three-way valve corresponding to each group of injectors through a feed pipeline; the controller is used for controlling the flow rate, the temperature and the liquid level of the solution, and comprises a 485 communication interface, a temperature sensor interface, a liquid level sensor interface, an Ethernet interface, a relay, a display screen interface, a WIFI module and a 433MHz wireless module, wherein the 485 communication interface of the controller is connected with the plurality of groups of injectors, the display screen interface is connected with the display screen, and the Ethernet interface is connected with the Ethernet; the WIFI module is connected with the WIFI wireless router through wireless; the 433MHz wireless module is connected with the 433MHz wireless gateway through a 433MHz wireless network; the 485 communication interface is connected with the plurality of groups of injectors through 2 groups of signal lines; the display screen interface is connected with the display screen through 4 groups of signal lines; the Ethernet interface is connected with the Ethernet through 4 groups of signal wires;
the feeding method of the miniature constant-current solution feeding system in the laboratory is characterized by comprising the following steps of:
s1, setting feeding information through remote or local operation, wherein the feeding information comprises liquid level high and low positions, temperature and flow rate; if the remote setting is selected, the feeding information is transmitted to a controller of the injection pump device through an Ethernet, a WIFI router or a 433 wireless network; if the local setting is selected, the feeding information is transmitted to a controller of the injection pump device through 4 groups of signal lines;
in step S1, when selecting remote setting, an operator sets a feeding parameter on a computer, and the feeding parameter is transmitted to an Ethernet interface, a WIFI module or a 433MHz wireless module of a controller through an Ethernet, a WIFI router or a 433 wireless network; the controller receives the feeding parameters through an Ethernet interface, a WIFI module or a 433MHz wireless module, a 485 communication interface of the controller transmits the feeding speed to a plurality of groups of injectors through 2 groups of signal lines, the controller transmits temperature information to a temperature sensor through a temperature sensor interface, the temperature sensor monitors real-time temperature, if the temperature does not reach the set temperature, the controller turns on a heater through a relay, the controller transmits liquid level information to a liquid level sensor through a liquid level sensor interface, and the liquid level sensor monitors the liquid level in real time;
s2, after receiving the injection information, a controller transmits the set temperature information to a temperature sensor, the temperature sensor monitors the solution in the filtering device in real time, the filtering device is used for filtering the solution provided by the storage device, the controller transmits the set liquid level information to a liquid level sensor, and the liquid level sensor monitors the liquid level of the solution in the storage device in real time;
and S3, feeding back monitoring results to the controller in real time by the temperature sensor and the liquid level sensor, and remotely feeding back the monitoring results to a remote computer or a local display screen to realize the real-time monitoring of injection of multiple groups of injectors remotely or locally.
2. The laboratory miniature constant-current solution feeding system according to claim 1, wherein a liquid level sensor for monitoring and alarming the liquid level of the storage device in real time is arranged in the storage device, and the liquid level sensor is connected with a liquid level sensor interface of the controller.
3. The laboratory miniature constant-current solution feeding system according to claim 1, further comprising a filtering device for filtering the solution conveyed by the storage device, wherein one end of the filtering device is connected with the storage device through a feeding pipeline, and the other end of the filtering device is connected with a three-way valve corresponding to the injector through the feeding pipeline.
4. A laboratory miniature constant flow solution feeding system according to claim 3, wherein a filter is arranged inside the filtering device for filtering out impurities in the solution.
5. A laboratory miniature constant-current solution feeding system according to claim 3, wherein a heater is arranged at the bottom of the filtering device, the heater is controlled by a relay, and the relay is connected with the controller through 3 groups of signal wires; the bottom of the filtering device is provided with a temperature sensor for detecting the temperature of the solution, and the temperature sensor is connected with the controller through a temperature sensor interface.
6. The laboratory miniature constant-current solution feeding system according to claim 1, wherein the controller sends a switch instruction to three-way valves of a plurality of groups of injectors, and the three-way valves are two and are used for controlling the flow direction of the solution and ensuring the continuity of feeding; the two three-way valves are opened and closed in turn, and if one three-way valve is feeding, the other three-way valve is discharging.
7. The laboratory miniature constant-current solution feeding system according to claim 1, wherein the display screen is a liquid crystal touch display screen, and can realize switching between local control and remote control, liquid level high-low setting and alarming, temperature setting, display and alarming, temperature linear correction and solvent heating setting.
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| CN201710738577.6A CN107491007B (en) | 2017-08-25 | 2017-08-25 | Miniature constant-current solution feeding system for laboratory and control method |
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| CN201710738577.6A CN107491007B (en) | 2017-08-25 | 2017-08-25 | Miniature constant-current solution feeding system for laboratory and control method |
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| CN111773475A (en) * | 2020-07-05 | 2020-10-16 | 华中科技大学同济医学院附属协和医院 | Control system and control method of remote micro-injection pump |
| CN112957567A (en) * | 2021-02-09 | 2021-06-15 | 杭州堃博生物科技有限公司 | Injection pump control method, system and equipment thereof |
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