CN101387651B - Automatic sample handling system and control method thereof - Google Patents

Automatic sample handling system and control method thereof Download PDF

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Publication number
CN101387651B
CN101387651B CN2008101990376A CN200810199037A CN101387651B CN 101387651 B CN101387651 B CN 101387651B CN 2008101990376 A CN2008101990376 A CN 2008101990376A CN 200810199037 A CN200810199037 A CN 200810199037A CN 101387651 B CN101387651 B CN 101387651B
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China
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sample
interface
pool
automatic
solenoid valve
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Expired - Fee Related
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CN2008101990376A
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CN101387651A (en
Inventor
李彩
曹文熙
孙兆华
卢桂新
柯天存
杨跃忠
郭超英
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South China Sea Institute of Oceanology of CAS
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South China Sea Institute of Oceanology of CAS
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Abstract

The invention provides an automatic sample feed system and a control method thereof. The automatic sample feed system comprise an automatic sample feed device and a control circuit thereof, wherein the automatic sample feed device comprises a sample pool, an agent pool, a three-way connector, a three-way electromagnetic valve, a sample mixing pool device and relative driving and controlling devices. According to a preset control program of the control circuit, the water sample of the sample pool and the agent of the agent pool are fed by peristaltic pumps to pass the three-way connector and the three-way electromagnetic valve to be filled into a sample mixing pool of the sample mixing pool device, and the injection pump head of the sample mixing pool device feeds the reacted mixture sample of the mixing sample pool via the three-way electromagnetic valve to enter into a detection device to process trace element and nutrient colorimetric analysis tests. The invention relates to the technical problems of the prior art such as automatic accurate proportioning of the trace elements and the nutrients of water in on-site online automatic colorimetric detection, sample feed and mixing reaction, to realize online detection on the trace elements and the nutrients of water.

Description

A kind of automatic sample handling system and control method thereof
Technical field
The present invention relates to a kind of automatic sampling apparatus and control method thereof, particularly a kind ofly be used for water body carries out online automatic detection to trace chemical elements water sample and the auto injection of reagent and the device and the control method thereof of mixing.
Background technology
For ease of in marine biogeochemistry research, carrying out routine monitoring; The researchist progressively will be transferred to the scene from the laboratory to the analysis of chemical element in the seawater; At present, in the laboratory in the water body in the colorimetric analysis process of tincture the input mode of water sample and reagent be hand sampling, artificially control sample mix course of reaction and reaction time; This method must have the staff to get involved, the unsuitable on-line analysis that is used for on-the-spot chemical element.For the on-site on-line measurement appearance; All sample introductions and hybrid reaction process all must be under unmanned situation of participating in, to accomplish automatically; Auto injection and hybrid reaction process are guaranteed reliability, the repeatability and stable of the measurement result of measuring instrument realizing that robotization accurately controlled the sample introduction ratio of sample and reagent simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of be used for controlling automatically water sample and reagent get in proportion the biased sample pond, the sample cell hybrid reaction and response sample send into the automatic sample handling system and the control method thereof of colorimetric measurement unit; With auto injection and automatic this series technique difficult problem of control hybrid reaction process of water sample and reagent in trace element and online colorimetric measurement of nutritive salt and the analytic process in the solution water body, improve the precision and the stability of on-line measurement and analytical technology.
Automatic sample handling system provided by the present invention comprises automatic sampling apparatus and control circuit thereof; Described automatic sampling apparatus comprises: sample cell, reagent pond, three-way connection, three-way solenoid valve and sample mix pool device; Described sample cell is connected to the first input interface a1 of three-way connection through first peristaltic pump; Described reagent pond is connected to the second input interface b1 of three-way connection through second peristaltic pump; Described sample mix pool device is a syringe type, comprises injection tube, push-rod piston, piston handle and injection pump head, with the inner chamber of injection tube as the sample mix pond; Described injection pump head inside has rotating screw mandrel and is installed in the moved back and forth nut on this screw mandrel; This nut is connected with the piston handle through anchor clamps, and described three-way solenoid valve has a, b, three interfaces of c, is connected with sample detection means with the injection port of injection tube head, the output interface c1 of three-way connection respectively; This three-way solenoid valve has that a interface communicates with the b interface, a interface communicates two kinds of state of a controls with the c interface, and described first peristaltic pump, second peristaltic pump and injection pump head are connected with three stepper motors respectively.
Described automatic sampling apparatus control circuit comprises microcomputer circuit, stepper motor driving circuit, industrial linear driving circuit; The TX1 of the UART1 serial ports of described microcomputer circuit is connected with stepper motor driving circuit through serial communication interface with RX1; The I/O mouth of microcomputer circuit is connected with industrial linear driving circuit; The output terminal of stepper motor driving circuit is connected with three stepper motors, and the output terminal of industrial linear driving circuit is connected with the control end of three-way solenoid valve.
The control circuit of described automatic sampling apparatus is controlled whole sample introduction process through UART1 serial ports on the microcomputer circuit and I/O mouth, and its controlled step comprises:
1), is used to be communicated with the controlled step of three-way solenoid valve a interface and b interface;
2), be used to drive three stepper motors and rotate by the rotating speed and the direction of appointment respectively, and then drive first peristaltic pump, second peristaltic pump and the injection pump head that are attached thereto are respectively sent into water sample and reagent the sample mix pond with the direction and the speed of appointment by preset proportion controlled step;
3), be used to be communicated with the controlled step of three-way solenoid valve a interface and c interface;
4), be used to drive with injecting the stepper motor that pump head is connected and rotate, having reacted the controlled step that biased sample is sent into pick-up unit in the biased sample pond with the direction of appointment.
Useful technique effect of the present invention: in trace element and nutritive salt online auto monitoring and the analysis and research, the auto injection of sample is a gordian technique difficult problem wherein in water body.The invention solves in the water body technical barrier of sample and the automatic precise proportioning of reagent, sample introduction and hybrid reaction in the on-the-spot on-line automatic colorimetric observation process of trace element and nutritive salt; Make that the on-line monitoring of trace element and nutritive salt becomes possibility in the water body; Whole process can be carried out under unmanned prerequisite of participating in automatically; Eliminated all errors that human factor produced, controlled repeatability and the consistance of having guaranteed apparatus measures result in conjunction with the accurate proportioning and the sample introduction of peristaltic pump and syringe pump.
Description of drawings
Fig. 1 is the structural representation of automatic sampling apparatus of the present invention;
Fig. 2 is the concrete control circuit schematic diagram of automatic sampling apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing the CONSTRUCTED SPECIFICATION of the specific embodiment of the invention is done further to specify:
The structure of automatic sampling apparatus that is used for water body trace element and nutritive salt automatic mixing, sample introduction and hybrid reaction is as shown in Figure 1; Mainly comprise reagent pond 19, sample cell 20, three-way connection 14, three-way solenoid valve 16 and sample mix pool device 21; Reagent pond 19 is through first peristaltic pump 4; Be connected to the first input interface a1 of three-way connection again through corrosion-resistant tension peristaltic pump tube 12; The rotating shaft of first peristaltic pump 4 is connected with the rotating shaft of first stepper motor 1 (drive motor of first peristaltic pump 4), the accurate sample introduction of control reagent; Sample cell 20 is through second peristaltic pump 5; Be connected to the second input interface b1 of three-way connection 14 again through corrosion-resistant tension peristaltic pump tube 13; The rotating shaft of second peristaltic pump 5 is connected with the rotating shaft of second stepper motor 2 (drive motor of second peristaltic pump 5), the accurate sample introduction of control water sample; Described sample mix pool device 21 is a syringe type; Constitute by injection tube 11, push-rod piston 10, piston handle 9 and injection pump head 6; With the inner chamber of injection tube 11 as the sample mix pond; Have rotating screw mandrel 7 and be installed in the moved back and forth nut 8 on this screw mandrel in the inside of injection pump head 6, this nut is connected with piston handle 9 through anchor clamps, and the screw mandrel 7 of injection pump head 6 is connected with the rotating shaft of the 3rd stepper motor 3 (rotational drive motor of screw mandrel 7); Described three-way solenoid valve 16 has a, b, three interfaces of c; Its a interface is connected with the injection port of injection tube 11 heads through corrosion-resistant flexible pipe 17; The b interface is connected with the output interface c1 of three-way connection 14 through corrosion-resistant flexible pipe 15, and the c interface is connected with sample detection means 22 through corrosion-resistant flexible pipe 18; This three-way solenoid valve 16 has that a interface communicates with the b interface, a interface communicates two kinds of state of a controls with the c interface, and when three-way solenoid valve 16 energisings, its a, b connect, otherwise its a, c hold connection.
Described automatic sampling apparatus control circuit comprises microcomputer circuit, serial interface circuit, stepper motor driving circuit and industrial linear driving circuit.Described microcomputer circuit employing has " C8051F020 " single-chip microcomputer 23 of dual uart serial ports, described stepper motor driving circuit is used for the three-axis stepping motor drive control module " TMCM310 " 26 that drive stepping motor 1,2,3 is worked; The linear driving circuit of industry adopts the linear chip for driving of technical grade " L6372 " 25, and described serial interface circuit adopts serial communication interface chip " MAX3232 " 24.Its physical circuit is as shown in Figure 2; The TX1 of the UART1 serial ports of " C8051F020 " single-chip microcomputer 23 links to each other with Rout with the Tin of serial communication interface chip 24 respectively with RX1; The Tout of serial communication interface chip 24 and Rin and GND link to each other the serial communication between realization single-chip microcomputer 23 and the three-axis stepping motor drive control module 26 with the Rin of the serial communication end of step motor drive control module 26 with Tout end and GND end respectively; The A00 of three-axis stepping motor drive control module 26, A10, B00, B10 connect A0, A1, B0, the B1 of first stepper motor 1 in the sampling device; The A01 of three-axis stepping motor drive control module 26, A11, B01, B11 connect A0, A1, B0, the B1 of second stepper motor 2 in the sampling device, and the A02 of three-axis stepping motor drive control module 26, A12, B02, B12 connect A0, A1, B0, the B1 of the 3rd stepper motor 3 in the sampling device; The IN1 input end of the corresponding industrial linear chip for driving 25 of the P1.0 mouth of single-chip microcomputer 23, the OUT1 end of industrial linear chip for driving 25 connects the power supply control end of the three-way solenoid valve 16 of automatic sampling apparatus.
The sample introduction control circuit is following to the controlled step of whole sample introduction process through UART1 serial ports and I/O mouth on the single-chip microcomputer " C8051F020 " 23:
A, power-up initializing, putting P1.0 is 1, guarantees that a of three-way solenoid valve 16, b two ends are communicated with;
B, send control step motors 1,2,3 respectively with the speed right-handed instruction simultaneously of RPM8.10, RPM30.05, RPM8.55 to step motor drive module 26, motor drive module 26 drives corresponding motor according to instruction and drives the Wriggling Pump Head or the injection pump head that are attached thereto and with the direction and the speed of appointment water sample and reagent are sent into sample mix pond (inner chamber of injection tube 11) in the ratio of 20:1;
C, T_int=0, the startup sample introduction 120s time interrupts, the stand-by period EOI, T_int is put 1, and this moment, sampling device was accomplished the sample introduction of 5ml biased sample;
D, send the instruction that control step motors 1,2,3 stop operating simultaneously to motor drive module 26, instruction stops corresponding motor to driver module 26 and the pump head that is attached thereto rotates according to receiving;
E, T_int=0, the startup 210s example reaction time interrupts, the stand-by period EOI, T_int is put 1;
F, put P1.0=0, guarantee that a of three-way solenoid valve 16, c two ends are communicated with;
G, send the instruction that control the 3rd stepper motor 3 is turned left with the speed of RPM5.40 to step motor drive module 26; Motor drive module drives the injection pump head that is attached thereto according to instruction driving the 3rd stepper motor 3 and rotates with the mode of appointment, sends having reacted the 5ml biased sample in biased sample pond (inner chamber of injection tube 11) into pick-up unit 22;
H, T_int=0 start 180 seconds and interrupt to the 22 sample presentation times of pick-up unit, the stand-by period EOI, T_int is put 1, this moment sampling device accomplish with in biased sample pond (inner chamber of injection tube 11) response sample send into the mission of pick-up unit 22 fully;
I、P1.0=1
J, send the instruction that control the 3rd stepper motor 3 stops operating to motor drive module 26, driver module 26 stops ` and ends the 3rd stepper motor 3 and rotate according to receiving instruction, accomplishes the sample introduction process of one whole;
If needing the repetition sample introduction to go to step B continues.

Claims (2)

1. an automatic sample handling system is characterized in that comprising automatic sampling apparatus and control circuit thereof, and described automatic sampling apparatus comprises:
Reagent pond (19), sample cell (20), three-way connection (14), three-way solenoid valve (16) and sample mix pool device (21); Described reagent pond (19) is connected to the first input interface a1 of three-way connection (14) through first peristaltic pump (4); Described sample cell (20) is connected to the second input interface b1 of three-way connection (14) through second peristaltic pump (5); Described sample mix pool device (21) is a syringe type; Comprise injection tube (11), push-rod piston (10), piston handle (9) and injection pump head (6); With the inner chamber of injection tube (11) as the sample mix pond; Described injection pump head (6) inside has rotating screw mandrel (7) and is installed in the moved back and forth nut (8) on this screw mandrel; This nut is connected with piston handle (9) through anchor clamps, and described three-way solenoid valve (16) has a, b, three interfaces of c, is connected with sample detection means (22) with the injection port of injection tube (11) head, the output interface c1 of three-way connection (14) respectively; This three-way solenoid valve (16) has that a interface communicates with the b interface, a interface communicates two kinds of state of a controls with the c interface, and described first peristaltic pump (4), second peristaltic pump (5) and injection pump head (6) are connected with three stepper motors (1,2,3) respectively;
Described automatic sampling apparatus control circuit comprises microcomputer circuit, stepper motor driving circuit, industrial linear driving circuit; Described microcomputer circuit adopts " C8051F020 " single-chip microcomputer (23) that has the dual uart serial ports; The TX1 of the UART1 serial ports of microcomputer circuit is connected with stepper motor driving circuit through serial communication interface with RX1; The I/O mouth of microcomputer circuit is connected with industrial linear driving circuit; The output terminal of stepper motor driving circuit is connected with three stepper motors (1,2,3), and the output terminal of industrial linear driving circuit is connected with the control end of three-way solenoid valve (16).
2. the auto injection control method of the described automatic sample handling system of claim 1 is characterized in that the controlled step of sample introduction process comprises:
1), is used to be communicated with the controlled step of three-way solenoid valve (16) a interface and b interface;
2), be used to drive three stepper motors (1,2,3) and rotate with direction by the rotating speed of appointment respectively, and then drive first peristaltic pump (4), second peristaltic pump (5) that is attached thereto respectively and inject pump head (6) is sent into water sample and reagent the sample mix pond with the direction and the speed of appointment by preset proportion controlled step;
3), be used to be communicated with the controlled step of three-way solenoid valve (16) a interface and c interface;
4), be used for driving the direction rotation of the stepper motor (3) that is connected with injection pump head (6), with having reacted the controlled step that biased sample is sent into pick-up unit in the biased sample pond with appointment.
CN2008101990376A 2008-10-08 2008-10-08 Automatic sample handling system and control method thereof Expired - Fee Related CN101387651B (en)

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