CN203965455U - A kind of automatic sampling apparatus detecting for water chemical oxygen demand - Google Patents
A kind of automatic sampling apparatus detecting for water chemical oxygen demand Download PDFInfo
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- CN203965455U CN203965455U CN201420379471.3U CN201420379471U CN203965455U CN 203965455 U CN203965455 U CN 203965455U CN 201420379471 U CN201420379471 U CN 201420379471U CN 203965455 U CN203965455 U CN 203965455U
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Abstract
The utility model relates to a kind of automatic sampling apparatus detecting for water chemical oxygen demand, comprise cabinet, Y-axis motion assembly, X-axis motion assembly and sample introduction module, it is characterized in that the base plate of cabinet is provided with the draw-in groove of fixing test tube rack, cabinet side is provided with fixed support, Y-axis motion assembly is fixed by screws in the support bracket fastened upper end of cabinet, X-axis motion assembly is fixed on the Y slide block of Y-axis motion assembly, and sample introduction module is fixed on support bracket fastened lower end.The utility model adopts quantity tube device, realize the accurate control of feed liquor amount, being used in conjunction with of quantity tube and liquid level sensor, while making feed liquor amount reach liquid level sensor, syringe pump stops feed liquor process, reagent is only present in quantity tube and pipeline, can not flow in syringe pump, has therefore avoided the pollution corrosion of liquid to syringe pump.The utility model has not only been realized increase feed liquor amount, and can realize the sample introduction to two kinds of liquid simultaneously.
Description
Technical field
The utility model relates to a kind of sampling system, relates in particular to a kind of automatic sampling apparatus detecting for water chemical oxygen demand.
Background technology
Along with the concern of people to environmental quality, water quality monitoring has also been subject to the pay attention to day by day of environment department, what the sample introduction of laboratory water chemical oxygen demand detection was at present taked is mostly hand sampling, and operating personnel add required potassium dichromate and concentrated sulphuric acid reagent to carry out subsequent detection in sample; The mode of this hand sampling, because operator's personal error can affect sample size, can not ensure sample introduction precision, and operation the concentrated sulphuric acid also there is certain danger, hand sampling mode sample injection time is long, work efficiency is lower; At present, although there is the device of various auto injection on market, but these devices are to be mostly used in the field such as chemical analysis, medicine equipment, the automatic sampling apparatus also not detecting for water chemical oxygen demand laboratory, existing automatic sampling apparatus is all generally micro-sampling, and device do not there is corrosion resistance, can not realize the sample introduction to the concentrated sulphuric acid, this just limited current water chemical oxygen demand laboratory detect can only hand sampling.
Utility model content
For deficiency of the prior art, the technical matters that the utility model quasi-solution is determined is, a kind of automatic sampling apparatus detecting for water chemical oxygen demand is provided, this device has simple in structure easy to operate, sample introduction precision is high, the advantage such as reproducible, has effectively overcome the problem that the artificial sample introduction running time length in laboratory, complicated operation, sample introduction precision can not be guaranteed.
The utility model solve the technical problem adopted technical scheme, a kind of automatic sampling apparatus detecting for water chemical oxygen demand is provided, comprise cabinet, Y-axis motion assembly, X-axis motion assembly and sample introduction module, it is characterized in that the base plate of cabinet is provided with the draw-in groove of fixing test tube rack, cabinet side is provided with fixed support, Y-axis motion assembly is fixed by screws in the support bracket fastened upper end of cabinet, X-axis motion assembly is fixed on the Y slide block of Y-axis motion assembly, and sample introduction module is fixed on support bracket fastened lower end;
Described Y-axis motion assembly comprises Y base plate, left socle, right support, Y-direction stepper motor, Y Timing Belt, two Y synchronous pulleys, Y coupling shaft, Y guide rail, Y slide block, connection bracket and Y limit switches, left socle, right support, Y guide rail and Y limit switch are fixed on described Y base plate, Y-direction stepper motor is fixed on left socle, and be connected and fixed with left side Y synchronous pulley, right Y synchronous pulley is fixed on right support by Y coupling shaft, the left side is connected by Y Timing Belt with the right Y synchronous pulley, and Y slide block and Y Timing Belt are fixed together by connection bracket;
Described X-axis motion assembly comprises that X support, X are to stepper motor, X Timing Belt, two X synchronous pulleys, X coupling shaft, X guide rail, X slide block, web joint and X limit switches, X support is connected by X guide rail with connection bracket, X is fixed in connection bracket to stepper motor and X limit switch, and be connected and fixed with left side X synchronous pulley, the right X synchronous pulley is fixed on X support by X coupling shaft, the left side is connected by X Timing Belt with the right X synchronous pulley, and X slide block and X Timing Belt are fixed together by web joint;
Described sample introduction module comprises syringe pump, the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, quantity tube, liquid level sensor, three-way connection and two feed tubes, described two feed tubes respectively with the left joint of the 4th solenoid valve, the right connector of the 3rd solenoid valve is connected, the left joint of the right connector of the 4th solenoid valve and the 3rd solenoid valve couples together by three-way connection, three-way connection is fixed on web joint by screw, the top connection of the top connection of the 4th solenoid valve and the 3rd solenoid valve respectively with the left side of the second solenoid valve, right connector is connected, the top connection of the second solenoid valve is connected with quantity tube lower end, described quantity tube upper end is provided with liquid level sensor, and quantity tube upper end is connected with syringe pump by the first solenoid valve,
Described syringe pump comprises: fixed base plate, left support abutment, right support abutment, bearing spider, leading screw, syringe, stepper motor and two syringe limit switches, left support abutment, right support abutment and two syringe limit switches are all fixed on fixed base plate, stepper motor is connected with left support abutment, described syringe is connected across between bearing spider and right support abutment, the piston of syringe is fixed on bearing spider, leading screw one end is connected with left support abutment, and the other end and right support abutment are fixed together.
Compared with prior art, what in the utility model, X-axis motion assembly and Y-axis motion assembly adopted is the kind of drive of Timing Belt, synchronizing wheel, and realizes and leading with guide rail, thereby has reduced motion artifacts, has increased the stationarity of motion, has improved travelling speed; Sample introduction module adopts syringe pump control, utilizes liquid level sensor accurately to control sample size, avoids the personal error of hand sampling, has improved sample introduction efficiency simultaneously; Adopt quantity tube device, realize the accurate control of feed liquor amount, being used in conjunction with of quantity tube and liquid level sensor, while making feed liquor amount reach liquid level sensor, syringe pump stops feed liquor process, reagent is only present in quantity tube and pipeline, can not flow in syringe pump, has therefore avoided the pollution corrosion of liquid to syringe pump.The utility model has not only been realized increase feed liquor amount, and can realize the sample introduction to two kinds of liquid simultaneously.
Brief description of the drawings
Fig. 1 is the perspective view of the utility model for a kind of embodiment of automatic sampling apparatus of water chemical oxygen demand detection;
Fig. 2 is the X-axis motion assembly 3 of a kind of embodiment of automatic sampling apparatus and the structural representation of Y-axis motion assembly 2 that the utility model detects for water chemical oxygen demand;
Fig. 3 is the structural representation of the utility model for the sample introduction module 4 of a kind of embodiment of automatic sampling apparatus of water chemical oxygen demand detection;
Fig. 4 is the structural representation of the utility model for the syringe pump 41 of a kind of embodiment of automatic sampling apparatus of water chemical oxygen demand detection;
In figure, 1. cabinet, 2.Y axle motion assembly, 3.X axle motion assembly, 4. sample introduction module, 5. fixed support, 6. draw-in groove, 200.Y base plate, 201. left socle, 202. right support, 203.Y is to stepper motor, 204.Y Timing Belt, 205.Y synchronous pulley, 206.Y coupling shaft, 207.Y guide rail, 208.Y slide block, 209. connection bracket, 210.Y limit switch, 301.X support, 302.X is to stepper motor, 303.X Timing Belt, 304.X synchronous pulley, 305.X coupling shaft, 306.X guide rail, 307.X slide block, 308. web joint, 309.X limit switch, 41. syringe pumps, 42. first solenoid valves, 43. quantity tubes, 44. liquid level sensors, 45. three-way connections, 46. feed tubes, 47. second solenoid valves, 48. the 3rd solenoid valves, 49. the 4th solenoid valves, 411. fixed base plate, 412, left support abutment, 413, right support abutment, 414. bearing spider, 415. leading screw, 416. syringe, 417. stepper motor, 418. syringe limit switches.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail:
The automatic sampling apparatus detecting for water chemical oxygen demand of the utility model design (is called for short device, referring to Fig. 1-4) comprise cabinet 1, Y-axis motion assembly 2, X-axis motion assembly 3, sample introduction module 4, wherein the base plate of cabinet 1 is provided with the draw-in groove 6 of fixing test tube rack, cabinet side is provided with fixed support 5, Y-axis motion assembly 2 is fixed by screws in the upper end of the fixed support 5 of cabinet, X-axis motion assembly 3 is fixed on the Y slide block 208 of Y-axis motion assembly, and sample introduction module 4 is fixed on the lower end of fixed support 5;
Described Y-axis motion assembly 2 comprises Y base plate 200, left socle 201, right support 202, Y-direction stepper motor 203, Y Timing Belt 204, two Y synchronous pulleys 205, Y coupling shaft 206, Y guide rail 207, Y slide block 208, connection bracket 209 and Y limit switch 210, left socle 201, right support 202, Y guide rail 207 and Y limit switch 210 are fixed on described Y base plate 200, Y-direction stepper motor 203 is fixed on left socle 201, and be connected and fixed with left side Y synchronous pulley 205, right Y synchronous pulley 205 is fixed on right support 202 by Y coupling shaft 206, the left side is connected by Y Timing Belt 204 with the right Y synchronous pulley 205, Y slide block 208 is fixed together by connection bracket 209 with Y Timing Belt 204,
Described X-axis motion assembly 3 comprises X support 301, X is to stepper motor 302, X Timing Belt 303, two X synchronous pulleys 304, X coupling shaft 305, X guide rail 306, X slide block 307, web joint 308 and X limit switch 309, X support 301 is connected by X guide rail 306 with connection bracket 209, X is fixed in connection bracket 209 to stepper motor 302 and X limit switch 309, and be connected and fixed with left side X synchronous pulley 304, the right X synchronous pulley 304 is fixed on X support 301 by X coupling shaft 305, the left side is connected by X Timing Belt 303 with the right X synchronous pulley 304, X slide block 307 is fixed together by web joint 308 with X Timing Belt 303,
Described sample introduction module 4 comprises syringe pump 41, the first solenoid valve 42, the second solenoid valve 47, the 3rd solenoid valve 48, the 4th solenoid valve 49, quantity tube 43, liquid level sensor 44, three-way connection 45 and two feed tubes 46, described two feed tubes 46 respectively with the left joint of the 4th solenoid valve 49, the right connector of the 3rd solenoid valve 48 is connected, the left joint of the right connector of the 4th solenoid valve 49 and the 3rd solenoid valve 48 couples together by three-way connection 45, three-way connection 45 is fixed on web joint 308 by screw, the top connection of the top connection of the 4th solenoid valve 49 and the 3rd solenoid valve 48 respectively with the left side of the second solenoid valve 47, right connector is connected, the top connection of the second solenoid valve 47 is connected with quantity tube 43 lower ends, described quantity tube 43 upper ends are provided with liquid level sensor 44, and quantity tube 43 upper ends are connected with syringe pump 41 by the first solenoid valve 42,
Described syringe pump 41 comprises: fixed base plate 411, left support abutment 412, right support abutment 413, bearing spider 414, leading screw 415, syringe 416, stepper motor 417 and two syringe limit switches 418, left support abutment 412, right support abutment 413 and two syringe limit switches 418 are all fixed on fixed base plate 411, stepper motor 417 is connected with left support abutment 412, described syringe 416 is connected across between bearing spider 414 and right support abutment 413, the piston of syringe 416 is fixed on bearing spider 414, leading screw 415 one end are connected with left support abutment 412, the other end and right support abutment 413 are fixed together.
The utility model device is further characterized in that described Y limit switch, X limit switch are mechanical contact-type switch or optoelectronic switch.
The utility model device is further characterized in that described the first solenoid valve 42, the second solenoid valve 47, the 3rd solenoid valve 48, the 4th solenoid valve 49 are the three-way solenoid valve of anti-strong acid.
The utility model device is further characterized in that described liquid level sensor 44 is ultrasonic sensor.
The utility model device is further characterized in that described quantity tube 43 material therefors are teflon or glass.
In the utility model, concrete structure (referring to Fig. 2) and the function of Y-axis motion assembly 2 and X-axis motion assembly 3 are: Y base plate 200 is that left socle 201, right support 202, Y guide rail 207 and Y limit switch 210 are arranged on Y base plate 200 for fixed support Y-axis motion assembly 2.Y-direction stepper motor 203 is fixed on left socle 201, and be fixedly connected with left side Y synchronous pulley 205, link together by Y Timing Belt 204 and the right Y synchronous pulley 205, the right Y synchronous pulley 205 is fixed on right support 202 by Y coupling shaft 206, and Y slide block 208 is fixed together by connection bracket 209 with Y Timing Belt 204.Y-direction stepper motor 203 drives two Y synchronous pulleys 205 to rotate, thereby drives Y slide block 208 to do rectilinear motion along Y guide rail 207, further drives X-axis motion assembly 3 to move horizontally along X guide rail 306.Connection bracket 209 not only plays the effect that is fixedly connected with slide block 208 and Y Timing Belt 204, also for fixing X to stepper motor 302 and X limit switch 309.
Further, Y base plate 200 is provided with Y limit switch 210, and in the time that Y slide block 208 touches Y limit switch 210, Y-direction stepper motor 203 quits work, and Y slide block 208 and Y limit switch 210 are for realizing the zero-point positioning to Y-axis.
X-axis motion assembly 3 comprises that X support 301, X are to stepper motor 302, X Timing Belt 303, two X synchronous pulleys 304, X coupling shaft 305, X guide rail 306, X slide block 307, web joint 308 and X limit switches 309.Wherein, X is fixed in connection bracket 209 to stepper motor 302, and is fixedly connected with left side X synchronous pulley 304.The right X synchronous pulley 304 is fixed on X support 301 by X coupling shaft 305, X support 301 links together by X guide rail 306 with connection bracket 209, X web joint 308 is not only for being fixed together X Timing Belt 303 and X slide block 307, also, for the installation location of three-way connection 45, realize the action to test tube sample introduction.X drives two X synchronous pulleys 304 to rotate to stepper motor 302, thereby drives X slide block 307 along X guide rail 306 moving linearlies, realizes the to-and-fro movement of three-way connection 45 to the sample introduction of different test tubes.
Further, connection bracket 209 is provided with X limit switch 309, and in the time that X slide block 307 touches X limit switch 309, X is to stepper motor 302 stop motions, and X slide block 307 and X limit switch 309 are for realizing the zero-point positioning to X-axis.
In the utility model, the concrete structure of sample introduction module 4 (referring to Fig. 3) and function are: comprise syringe pump 41, the first solenoid valve 42, quantity tube 43, liquid level sensor 44, three-way connection 45, two feed tubes 46, the second solenoid valve 47, the 3rd solenoid valve 48 and the 4th solenoid valves 49.Syringe pump 41 is connected with quantity tube 43 upper ends by the first solenoid valve 42, liquid level sensor 44 is installed, for realizing the accurate control to feed liquor amount on quantity tube 43.Quantity tube 43 lower ends are connected with the top connection of the second solenoid valve 47, and the left and right joint of the second solenoid valve is connected with the top connection of the 4th solenoid valve 49, the 3rd solenoid valve 48 respectively, the path of switching solenoid valve, thus control feed liquor and the discharge opeing to different liquids.Two feed tubes 46 are connected with the left joint of the 4th solenoid valve 49, the right connector of the 3rd solenoid valve 48 respectively, for completing the process of imbibition.The right connector of the 4th solenoid valve 49, the left joint of the 3rd solenoid valve 48 are connected respectively on two interfaces of three-way connection 45, and another interface of three-way connection 45 is connected with X web joint 308, and then complete the sample introduction process to different test tubes.
Further, the use of liquid level sensor 44 and quantity tube 43, had both ensured not liquid body pollution of syringe pump 41, can realize again the accurate control to feed liquor amount.
In the utility model, the concrete structure of syringe pump 41 (referring to Fig. 4) and function are: fixed base plate 411, left support abutment 412, right support abutment 413, bearing spider 414, leading screw 415, syringe 416, stepper motor 417 and two syringe limit switches 418.Left support abutment 412 and right support abutment 413, two syringe pump limit switches 418 are fixedly mounted on fixed base plate 411, stepper motor 417 is fixed on left support abutment 412, leading screw 415 is connected with left support abutment 412 and right support abutment 413 respectively, stepper motor 417 drives leading screw 415 to rotate, thereby driving bearing bearing 414 moving linearlies, the piston of syringe 416 and bearing spider 414 are fixed together, the push-and-pull of the piston of the motion pushing syringe 416 of bearing spider 414, syringe 416 produces negative pressure in push-and-pull process, advances suction and the discharge of liquid in pipeline.
Further, syringe limit switch 418 is controlled respectively the range of syringe push-and-pull.In the time that bearing spider 414 contacts with left side syringe limit switch 418, show that imbibition process reaches maximum range, feed liquor finishes, stepper motor 417 reverses, start discharge opeing process, in the time that bearing spider 414 contacts with the right syringe limit switch 418, show that discharge opeing process finishes.
The utility model device is mainly for the sample introduction that detects required two kinds of reagent potassium dichromates and the concentrated sulphuric acid in water chemical oxygen demand, and this device is compared with respect to prior art, and not only feed liquor amount is large, and can realize the sample introduction to two kinds of liquid simultaneously.Sample introduction position and the flow control etc. of the utility model device all complete under computer control.
In the utility model, the base plate of cabinet 1 is provided with the draw-in groove 6 of fixing test tube rack, is used for realizing the location to test tube rack, thereby realizes the accurate location of the position to 16 test tubes, meanwhile, uses draw-in groove 6 can make operating personnel easily test tube rack be replaced; The utility model can complete successively to 16 sample introduction processes with interior test tube.
What in the utility model, X-axis motion assembly 3 and Y-axis motion assembly 2 adopted is the kind of drive of Timing Belt, synchronizing wheel, and realizes and leading with guide rail, thereby has reduced motion artifacts, has increased the stationarity of motion, has improved travelling speed; Sample introduction module 4 adopts syringe pump 41 to control, and utilizes liquid level sensor 44 accurately to control sample size, avoids the personal error of hand sampling, has improved sample introduction efficiency simultaneously; Adopt quantity tube 43 to realize the accurate control of feed liquor amount, quantity tube 43 is used in conjunction with liquid level sensor 44, while making feed liquor amount reach liquid level sensor 44, syringe pump 41 stops feed liquor process, reagent is only present in quantity tube and pipeline, can not flow in syringe pump, therefore avoid the pollution corrosion of liquid to syringe pump.The quantity tube 43 that the utility model adopts teflon or glass to make, and all pipelines of device all adopt polyfluortetraethylene pipe as link, and then ensured acid resistance and the corrosion resistance of device.
Embodiment 1
The automatic sampling apparatus detecting for water chemical oxygen demand in the present embodiment can be realized two-way feed liquor, mainly for detect two kinds of required reagent in water chemical oxygen demand: potassium dichromate and the concentrated sulphuric acid.After device powers on, 1～16 different sample introduction test tube quantity can be set, the rear needs that detect according to reality be set, successively to each test tube sample introduction 10ml potassium dichromate and the 30ml concentrated sulphuric acid.This device can complete the sample introduction of 16 test tubes in 19 minutes, and sample introduction error is less than 1ml, and sample introduction precision is in 2.5%.
Claims (5)
1. the automatic sampling apparatus detecting for water chemical oxygen demand, comprise cabinet, Y-axis motion assembly, X-axis motion assembly and sample introduction module, it is characterized in that the base plate of cabinet is provided with the draw-in groove of fixing test tube rack, cabinet side is provided with fixed support, Y-axis motion assembly is fixed by screws in the support bracket fastened upper end of cabinet, X-axis motion assembly is fixed on the Y slide block of Y-axis motion assembly, and sample introduction module is fixed on support bracket fastened lower end;
Described Y-axis motion assembly comprises Y base plate, left socle, right support, Y-direction stepper motor, Y Timing Belt, two Y synchronous pulleys, Y coupling shaft, Y guide rail, Y slide block, connection bracket and Y limit switches, left socle, right support, Y guide rail and Y limit switch are fixed on described Y base plate, Y-direction stepper motor is fixed on left socle, and be connected and fixed with left side Y synchronous pulley, right Y synchronous pulley is fixed on right support by Y coupling shaft, the left side is connected by Y Timing Belt with the right Y synchronous pulley, and Y slide block and Y Timing Belt are fixed together by connection bracket;
Described X-axis motion assembly comprises that X support, X are to stepper motor, X Timing Belt, two X synchronous pulleys, X coupling shaft, X guide rail, X slide block, web joint and X limit switches, X support is connected by X guide rail with connection bracket, X is fixed in connection bracket to stepper motor and X limit switch, and be connected and fixed with left side X synchronous pulley, the right X synchronous pulley is fixed on X support by X coupling shaft, the left side is connected by X Timing Belt with the right X synchronous pulley, and X slide block and X Timing Belt are fixed together by web joint;
Described sample introduction module comprises syringe pump, the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, quantity tube, liquid level sensor, three-way connection and two feed tubes, described two feed tubes respectively with the left joint of the 4th solenoid valve, the right connector of the 3rd solenoid valve is connected, the left joint of the right connector of the 4th solenoid valve and the 3rd solenoid valve couples together by three-way connection, three-way connection is fixed on web joint by screw, the top connection of the top connection of the 4th solenoid valve and the 3rd solenoid valve respectively with the left side of the second solenoid valve, right connector is connected, the top connection of the second solenoid valve is connected with quantity tube lower end, described quantity tube upper end is provided with liquid level sensor, and quantity tube upper end is connected with syringe pump by the first solenoid valve,
Described syringe pump comprises: fixed base plate, left support abutment, right support abutment, bearing spider, leading screw, syringe, stepper motor and two syringe limit switches, left support abutment, right support abutment and two syringe limit switches are all fixed on fixed base plate, stepper motor is connected with left support abutment, described syringe is connected across between bearing spider and right support abutment, the piston of syringe is fixed on bearing spider, leading screw one end is connected with left support abutment, and the other end and right support abutment are fixed together.
2. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described Y limit switch, X limit switch are mechanical contact-type switch or optoelectronic switch.
3. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve are the three-way solenoid valve of anti-strong acid.
4. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described liquid level sensor is ultrasonic sensor.
5. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described quantity tube material therefor is teflon or glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379471.3U CN203965455U (en) | 2014-07-08 | 2014-07-08 | A kind of automatic sampling apparatus detecting for water chemical oxygen demand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379471.3U CN203965455U (en) | 2014-07-08 | 2014-07-08 | A kind of automatic sampling apparatus detecting for water chemical oxygen demand |
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| CN203965455U true CN203965455U (en) | 2014-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420379471.3U Withdrawn - After Issue CN203965455U (en) | 2014-07-08 | 2014-07-08 | A kind of automatic sampling apparatus detecting for water chemical oxygen demand |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062457A (en) * | 2014-07-08 | 2014-09-24 | 河北工业大学 | Automatic sample feeding device for detecting chemical oxygen demand of water quality |
-
2014
- 2014-07-08 CN CN201420379471.3U patent/CN203965455U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062457A (en) * | 2014-07-08 | 2014-09-24 | 河北工业大学 | Automatic sample feeding device for detecting chemical oxygen demand of water quality |
| CN104062457B (en) * | 2014-07-08 | 2015-08-05 | 河北工业大学 | A kind of automatic sampling apparatus detected for water chemical oxygen demand |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20141126 Effective date of abandoning: 20150805 |
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