CN115684434A - Pretreatment all-in-one machine for processing environmental air sample and liquid sample - Google Patents
Pretreatment all-in-one machine for processing environmental air sample and liquid sample Download PDFInfo
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- CN115684434A CN115684434A CN202210727398.3A CN202210727398A CN115684434A CN 115684434 A CN115684434 A CN 115684434A CN 202210727398 A CN202210727398 A CN 202210727398A CN 115684434 A CN115684434 A CN 115684434A
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Abstract
The invention provides a pretreatment all-in-one machine for processing an ambient air sample and a liquid sample, which comprises: the analysis sampling device comprises a shell, a gas chromatograph and a gas chromatograph, wherein a headspace sampling channel and an analysis sampling channel are arranged in the shell, a headspace six-way valve is arranged in the headspace sampling channel, an analysis six-way valve is arranged in the analysis sampling channel, and a carrier gas outlet of the gas chromatograph is sequentially communicated with the headspace six-way valve, the analysis six-way valve and a sampling port of the gas chromatograph; the liquid sample injection assembly comprises a sample bottle and a top bottle motor, wherein the top bottle motor drives the sample bottle to be communicated with the headspace six-way valve; the air sample injection assembly comprises an analytic tube and an analytic motor, and the analytic motor drives the analytic tube to be communicated with the analytic six-way valve; and the controller is connected with and controls the headspace six-way valve, the analytic six-way valve, the bottle jacking motor and the analytic motor. The problems of inconvenient and unsafe operation when a headspace sample injector and thermal desorption are used for analyzing an ambient air sample and a liquid sample in the prior art are solved.
Description
Technical Field
The invention belongs to the technical field of environmental analysis, and particularly relates to a pretreatment all-in-one machine for processing an environmental air sample and a liquid sample.
Background
The thermal desorption is called thermal desorption or thermal desorption in China, is a full-automatic pretreatment device for an ambient air sample, and is characterized in that a collected sample tube is placed into the thermal desorption, a sample pipeline is hermetically heated, and then a sample analyzed from the sample tube is introduced into a gas chromatograph for analysis through switching of a valve body.
The head space sample injector is full-automatic pretreatment equipment for liquid samples in the environment, the liquid samples are placed in a special head space bottle, the liquid samples in the head space bottle are heated, organic gas in the liquid samples can release volatile organic compounds at a certain temperature, a vapor-liquid balance state is realized, and then the samples released from the upper part of the head space bottle are guided into a gas chromatograph for analysis through switching of a valve body.
Thermal desorption and headspace sample injectors in the current market are independent devices, and have two conditions, namely, firstly, one gas chromatograph cannot use the headspace sample injector when in thermal desorption, and can be continuously used only by replacing a sample injection pipeline, so that the operation is complicated, and gas leakage cannot be easily caused by poor replacement; secondly, two kinds of equipment are connected to two gas chromatographs respectively, so that the cost is high and the occupied space is large.
The existing headspace sample injector and thermal desorption equipment are complex in structure, high in operation difficulty, low in automation degree and not safe enough.
Disclosure of Invention
The invention aims to provide a pretreatment all-in-one machine for processing an ambient air sample and a liquid sample, which solves the problems of inconvenient and unsafe operation when a headspace sample injector and thermal desorption are used for analyzing the ambient air sample and the liquid sample in the prior art.
The invention provides a pretreatment all-in-one machine for processing environmental air samples and liquid samples, which comprises a shell, wherein a headspace sampling channel and an analytic sampling channel are arranged in the shell;
the liquid sample injection assembly comprises a sample bottle and a top bottle motor, wherein the top bottle motor drives the sample bottle to be communicated with the headspace six-way valve;
the air sampling assembly comprises an analytic tube and an analytic motor, and the analytic motor drives the analytic tube to be communicated with the analytic six-way valve;
and the controller is connected with and controls the headspace six-way valve, the analytic six-way valve, the bottle jacking motor and the analytic motor.
Preferably, the liquid sample injection assembly comprises a sample bottle, a top bottle motor and a first transmission assembly, the sample bottle is connected with the headspace six-way valve, the top bottle motor drives the headspace sample injection needle and the headspace heating body through the first transmission assembly, the headspace sample injection needle is connected with the headspace sample injection channel, a travel switch connected with the top bottle motor is arranged on the first transmission assembly, and when the headspace sample injection needle is communicated with the sample bottle, the travel switch is triggered.
Preferably, the air sampling subassembly is including analytic pipe, analytic motor and second drive assembly, and analytic pipe links to each other with analytic six-way valve, and analytic motor passes through analytic syringe of second drive assembly drive and analyzes the heating member, and analytic syringe links to each other with analytic sampling channel, is provided with the travel switch who links to each other with analytic motor on the second drive assembly, when analytic syringe intercommunication analytic pipe, triggers travel switch.
Preferably, the liquid sampling assembly comprises a headspace sample disc and a headspace fixing frame, the first transmission assembly comprises a bidirectional screw rod, sample bottles are arranged in the headspace sample disc, the bidirectional screw rod is fixed in a limiting guide groove of the headspace fixing frame and is connected with a headspace bottle motor, threads with opposite turning directions are respectively arranged on the upper side and the lower side of the bidirectional screw rod along the length direction, an upper nut seat and a lower nut seat matched with the threads are respectively sleeved on the two sides of the bidirectional screw rod, the upper nut seat is connected with the sample heating block, and the lower nut seat is connected with the headspace sampling needle.
Preferably, the air sampling assembly comprises an analysis sample disc and an analysis fixing frame, the analysis sample disc is arranged below the headspace sample disc, an analysis pipe is arranged in the analysis sample disc, the second transmission assembly comprises a bidirectional lead screw, a limiting guide groove is formed in the analysis fixing frame, the bidirectional lead screw is fixed in the limiting guide groove and connected with an analysis motor, threads with opposite rotation directions are respectively arranged on the upper side and the lower side of the bidirectional lead screw along the length direction, a first nut seat and a second nut seat matched with the threads are respectively sleeved on the two sides of the bidirectional lead screw, and the first nut seat and the second nut seat are slidably arranged in the limiting guide groove; the first nut seat and the second nut seat are respectively connected with two ends of the heating body through a pivotable connecting rod, the first nut seat is connected with the first analytic sample injection needle, and the second nut seat is connected with the second analytic sample injection needle.
Preferably, the liquid sampling assembly further comprises a headspace driving motor, the headspace driving motor is used for driving the headspace sample tray to rotate, a headspace sensor is further arranged at a preset heating position below the headspace sample tray, and the headspace sensor is connected with the headspace driving motor.
Preferably, the air sampling assembly further comprises an analysis driving motor, the analysis driving motor is used for driving the analysis sample tray to rotate, a preset heating position analysis sensor is arranged below the analysis sample tray, and the analysis sensor is connected with the analysis driving motor.
Compared with the prior art, the invention has the beneficial effects that:
(1) The two kinds of pretreatment equipment of environment air treatment equipment and environment liquid treatment equipment are combined into one, the size is small, the functions are multiple, one sample pipeline is used for analyzing in the same gas chromatography, the pipeline of a chromatography sample inlet is not required to be frequently replaced, the environment air sample and the environment liquid sample are switched in the same pipeline, and therefore a series of problems such as air leakage caused by replacement of a gas circuit can be avoided.
(2) The invention redesigns the structures of the liquid sample injection assembly and the air sample injection assembly, and controls the headspace six-way valve, the analytic six-way valve, the top bottle motor and the analytic motor by using the controller, thereby automatically realizing the process of replacing the gas circuit, and having simple operation, safety and high efficiency.
Drawings
Figure 1 is an isometric view of an assembly of a pre-processing integrated machine for processing an ambient air sample and a liquid sample in accordance with an embodiment of the present invention.
Fig. 2 is an assembly view of the liquid sample injection assembly and the air sample injection assembly of fig. 1.
Fig. 3 is a schematic structural diagram of the liquid sample injection assembly shown in fig. 2.
Fig. 4 is a schematic structural diagram of the air sampling assembly shown in fig. 2.
FIG. 5 is a schematic diagram of the gas path structure of the headspace sample injection channel and the analytic sample injection channel of the present invention.
FIG. 6 is a schematic structural diagram of the analytical sample injection assembly of the present invention.
Wherein the reference numbers are as follows:
10. a liquid sample introduction assembly; 11. a headspace sample pan; 12. a bottle-jacking motor; 13. a headspace heater; 14. a headspace drive motor; 15. a bottle-jacking motor assembly; 20. an air sample introduction assembly; 21. analyzing the sample disc; 22. resolving the motor; 23. analyzing the heating block; 24. resolving the driving motor; 25. analyzing a sample injection needle; 30. a carrier gas outlet; 40. a headspace sample introduction channel; 41. a headspace six-way valve; 42. a dosing tube; 43. a sample bottle; 44. a first solenoid valve; 45. a headspace vent; 46. a carrier gas outlet; 50. analyzing a sample feeding channel; 51. resolving the six-way valve; 52. a cold trap pipe; 53. a desorption tube; 54. a second solenoid valve; 55. analyzing the exhaust port; 56. a sample inlet; 60. a housing; 61. an observation window; 62. and operating the screen. 71. A first nut seat; 72. a second nut seat; 73. a bidirectional lead screw; 74. and limiting guide grooves.
Detailed Description
In order to more clearly illustrate the technical features of the present invention, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "liquid level", "vertical", "liquid level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 5, the present invention provides a pre-processing integrated machine for processing an ambient air sample and a liquid sample, comprising: a housing 60, wherein a headspace sample injection channel 40 and an analytic sample injection channel 50 are arranged in the housing 60, a headspace six-way valve 41 is arranged in the headspace sample injection channel 40, an analytic six-way valve 51 is arranged in the analytic sample injection channel 50, and a carrier gas outlet 4630 of the gas chromatograph is sequentially communicated with the headspace six-way valve 41, the analytic six-way valve 51 and a sample injection port 56 of the gas chromatograph;
the liquid sampling assembly 10 comprises a sample bottle 43 and a top bottle motor 12, wherein the top bottle motor 12 drives the sample bottle 43 to be communicated with a headspace six-way valve 41;
the air sampling assembly 20 comprises an analytic tube 53 and an analytic motor 22, and the analytic motor 22 drives the analytic tube 53 to be communicated with the analytic six-way valve 51;
and the controller is connected with and controls the headspace six-way valve 41, the analysis six-way valve 51, the bottle-jacking motor 12 and the analysis motor 22.
Wherein, the housing 60 is further provided with an operation screen 62, and the operation screen 62 is used for operating the controller. Referring to fig. 5, the second interface of the headspace six-way valve 41 is connected to the carrier gas outlet 30 of the gas chromatograph, the first interface of the headspace six-way valve 41 is connected to the second interface of the analytic six-way valve 51, and the first interface of the analytic six-way valve 51 is connected to the sample inlet 56 of the gas chromatograph. The sealing component of the headspace six-way valve 41 is adjusted to communicate with the carrier gas outlet 30, the sample bottle 43 and the sample inlet 56, and the sealing component of the analysis six-way valve 51 is adjusted to communicate with the carrier gas outlet 30, the analysis tube 53 and the sample inlet 56.
Compared with the prior art, the invention has the beneficial effects that:
(1) The two kinds of pretreatment equipment of environment air treatment equipment and environment liquid treatment equipment are combined into one, the size is small, the functions are multiple, one sample pipeline is used for analyzing in the same gas chromatography, the pipeline of a chromatography sample inlet is not required to be frequently replaced, the environment air sample and the environment liquid sample are switched in the same pipeline, and therefore a series of problems such as air leakage caused by replacement of a gas circuit can be avoided.
(2) The invention redesigns the structures of the liquid sample injection assembly and the air sample injection assembly, and uses the controller to control the headspace six-way valve, the analytic six-way valve, the top bottle motor and the analytic motor, thereby automatically realizing the process of replacing the gas circuit, and having simple operation, safety and high efficiency.
Referring to fig. 5, a plurality of first solenoid valves 44 are disposed in the headspace sampling channel 40, a plurality of second solenoid valves 54 are disposed in the desorption sampling channel 50, and by adjusting these first solenoid valves 44, second solenoid valves 54, and the headspace six-way valve 41 and the desorption six-way valve 51, three operation modes can be realized: the pressure system, the normal pressure system, and the negative pressure system are explained below:
1. the operation state of the headspace part: (pressure mode)
The carrier gas for gas chromatography enters from the 2 ports of the headspace six-way valve, exits from the 1 port, enters from the 2 ports of the analytic six-way valve, and exits from the 1 port. The sample dish is according to self-defined setting and is look for the sample position automatically through the sensor (this product is 20 automatic, enlarges the sample dish and can increase the sample grade). The top bottle motor 12 moves upwards, the sample bottle 43 is moved into the top air heating box to be balanced, the V2 electromagnetic valve 44 is opened, the top air sampling pipeline is purged and cleaned according to user-defined time, the V2 electromagnetic valve 44 is closed after purging time is finished, the balance time is finished, the top bottle motor 12 continues to move upwards, and the top air sampling needle penetrates through a sealing gasket of the sample bottle 43 to stop moving. The V2 solenoid 44 is opened and high pressure gas enters through 4 ports and exits through 3 ports of the headspace six-way valve, passes through the dosing ring, enters through 6 ports and exits through 5 ports, pressurizes and equilibrates in the sample vial 43, and the V2 solenoid 44 is closed. The V4 electromagnetic valve 44 is opened, the high-pressure vaporized sample in the sample bottle 43 enters the 5-port inlet of the headspace six-way valve through the headspace sample injection needle, exits from the 6-port inlet, passes through the quantitative tube 42, enters from the 3-port inlet, exits from the 4-port outlet, the pressure in the sample bottle 43 is released to be consistent with the atmospheric pressure, and the V4 electromagnetic valve 44 is closed. And (3) rotating the headspace six-way valve, allowing carrier gas to enter from the port 2, exit from the port 3, pass through the quantitative tube 42, enter from the port 6, exit from the port 1, enter from the port 2 of the analytic six-way valve, exit from the port 1, allowing a sample to enter a gas chromatograph for analysis, starting running set analysis time at the same time, and finishing sampling and rotating the headspace six-way valve for resetting. At the end of the analysis time, the top bottle motor 12 is returned to the zero position and the sample bottle 43 is returned to its original sample level. The sample tray is automatically rotated to the next position and the above action is repeated.
2. The operation state of the headspace part: (atmospheric pressure mode)
The carrier gas for gas chromatography enters from the 2 nd port of the headspace six-way valve 41, exits from the 1 st port, enters from the 2 nd port of the analytical six-way valve 51, and exits from the 1 st port. The sample dish is according to self-defined setting and is look for the sample position automatically through the sensor (this product is 20 automatic, enlarges the sample dish and can increase the sample grade). The top bottle motor 12 moves upwards, the sample bottle 43 is moved into the top air heating box to be balanced, the V2 electromagnetic valve 44 is opened, the top air sampling pipeline is purged and cleaned according to user-defined time, the V2 electromagnetic valve 44 is closed after purging time is finished, the balance time is finished, the top bottle motor 12 continues to move upwards, and the top air sampling needle penetrates through a sealing gasket of the sample bottle 43 to stop moving. The V4 electromagnetic valve 44 is opened, the high-pressure vaporized sample in the sample bottle 43 enters the 5-port inlet of the headspace six-way valve 41 through the headspace sample injection needle, exits from the 6-port inlet, passes through the quantitative tube 42, enters from the 3-port inlet, exits from the 4-port outlet, the pressure in the sample bottle 43 is released to be consistent with the atmospheric pressure, and the V4 electromagnetic valve 44 is closed. And rotating the headspace six-way valve 41, wherein the carrier gas enters from the port 2, exits from the port 3, passes through the quantitative tube 42, enters from the port 6, exits from the port 1, enters from the port 2 of the analytic six-way valve 51, exits from the port 1, enters the gas chromatograph for analysis, and simultaneously starts to run for the set analysis time, and the headspace six-way valve 41 is rotated and reset after the sample injection is finished. At the end of the analysis time, the top bottle motor 12 is returned to the zero position and the sample bottle 43 is returned to its original sample level. The sample tray is automatically rotated to the next position and the above action is repeated. And finally out of the headspace exhaust port 45.
3. Head space part operating state: (negative pressure type)
The carrier gas for gas chromatography enters from the 2 nd port of the headspace six-way valve 41, exits from the 1 st port, enters from the 2 nd port of the analytical six-way valve 51, and exits from the 1 st port. The sample dish is according to self-defined setting and is look for the sample position automatically through the sensor (this product is 20 automatic, enlarges the sample dish and can increase the sample grade). The top bottle motor 12 moves upwards, the sample bottle 43 is moved to the top space heating block 13 to be balanced, the V2 electromagnetic valve 44 is opened, the top space sampling pipeline is purged and cleaned according to user-defined time, the V2 electromagnetic valve 44 is closed after purging time is finished, the balance time is finished, the top bottle motor 12 continues to move upwards, and the top space sampling needle penetrates through a sealing gasket of the sample bottle 43 to stop moving. The V7 electromagnetic valve 44 is opened and the negative pressure pump is opened at the same time, the vaporized sample in the sample bottle 43 enters the 5-port inlet of the headspace six-way valve 41 through the headspace sampling needle, exits from the 6-port inlet, passes through the quantitative tube 42, enters from the 3-port inlet, and exits from the 4-port outlet, the pressure in the sample bottle 43 is pumped to a negative pressure state, and the V7 electromagnetic valve 44 is closed and the negative pressure pump is closed at the same time. And rotating the headspace six-way valve 41, allowing the carrier gas to enter from the 2-port, to exit from the 3-port, to pass through the quantitative tube 42, to enter from the 6-port, to exit from the 1-port, to enter from the 2-port of the analytic six-way valve 51, to exit from the 1-port, allowing the sample to enter the gas chromatograph for analysis, starting to operate for the set analysis time, and rotating and resetting the headspace six-way valve 41 after sample injection is finished. At the end of the analysis time, the top bottle motor 12 is returned to the zero position and the sample bottle 43 is returned to its original sample level. The sample tray is automatically rotated to the next position and the above action is repeated.
Referring to fig. 5, the analytic sample channel includes a plurality of analytic solenoid valves 54, and the analytic solenoid valves 54 and the analytic six-way valve 51 are adjusted to realize the analytic part operation status, which includes the following steps:
the carrier gas for gas chromatography enters from the 2 nd port of the headspace six-way valve 41, exits from the 1 st port, enters from the 2 nd port of the analytical six-way valve 51, and exits from the 1 st port. The sample position is found automatically through the sensor to the sample dish according to self-defining setting (this product is 24 automatic, enlarges the sample dish and can increase the sample grade). The analysis motor 22 works, the analysis sampling needle 25 is driven by the positive and negative lead screws to synchronously move inwards, the sealing gasket is punctured, the primary analysis tube 53 is clamped, and meanwhile, the heating block moves forwards to heat the analysis tube 53. And opening the V5 and V6 electromagnetic valves 44, enabling the enriched gas to flow out of the V5, enabling the sample to enter the 5 ports of the analytical six-way valve 51 from the primary analytical pipe 53, flow out of the 6 ports, enter the cold trap pipe 52 in the low-temperature trap for enrichment, flow into the 3 ports, flow out of the 4 ports, discharging the enriched gas from the V6 electromagnetic valves 44, and closing the V5 and V6 electromagnetic valves 44 after the enrichment time is over. And (3) rotating the analysis six-way valve 51, allowing the carrier gas to enter from the 2 port, to exit from the 1 port, to enter the 2 port of the analysis six-way valve 51, to exit from the 3 port, to pass through the cold trap pipe 52, to enter the 6 port, and to exit from the 1 port, allowing the sample to enter a gas chromatograph for analysis, and simultaneously starting to operate for a set analysis time, and rotating and resetting the analysis six-way valve 51 after sample introduction is finished. The V3, V8 solenoid valve 44 is opened, gas enters the 4 ports of the resolver six-way valve 51 from the V3 solenoid valve 44, exits from the 3 ports, enters the 6 ports through the cold trap pipe 52, exits from the 5 ports, enters the V8 solenoid valve 44 through the primary resolver pipe 53, and is discharged, and the V3, V8 solenoid valve 44 is closed after the activation time. After the analysis time is over, the analysis sampling needle 25 is driven by the bidirectional screw rod to synchronously move outwards, and the analysis heating block 23 moves backwards to cool the analysis tube 53. The analysis sample disk 21 is automatically rotated to the next position, and the above operation is repeated. And finally exhausted from the desorption exhaust port 55.
Referring to fig. 1 to 6, in one embodiment, the liquid sample injection assembly 10 includes a sample bottle 43, a headspace motor 12 and a first transmission assembly, the sample bottle 43 is connected to a headspace six-way valve 41, the headspace motor 12 drives a headspace sample injection needle and a headspace heating body 13 through the first transmission assembly, the headspace sample injection needle is connected to a headspace sample injection channel 40, the first transmission assembly is provided with a stroke switch connected to the headspace sample injection needle 12, and when the headspace sample injection needle is communicated with the sample bottle 43, the stroke switch is triggered. The travel switch can control the top bottle motor 12 to automatically stop, so that the top air heating body 13 stops after reaching a preset heating position, and the sample bottle 43 can be safely and accurately heated.
Referring to fig. 1 to 6, the air sampling assembly 20 includes an analyzing tube 53, an analyzing motor 22 and a second transmission assembly, the analyzing tube 53 is connected to an analyzing six-way valve 51, the analyzing motor 22 drives the analyzing needle 25 and the analyzing heating body 23 through the second transmission assembly, the analyzing needle 25 is connected to the analyzing sampling channel 50, a travel switch connected to the analyzing motor 22 is disposed on the second transmission assembly, and when the analyzing needle 25 is communicated with the analyzing tube 53, the travel switch is triggered. The travel switch can control the analysis motor 22 to automatically stop, so that the analysis heating body 23 can stop after reaching a preset heating position, and the analysis tube 53 can be safely and accurately heated.
Referring to fig. 1 to 6, the liquid sample injection assembly 10 includes a headspace sample tray 11 and a headspace fixing frame, the first transmission assembly includes a bidirectional screw rod, a sample bottle 43 is disposed in the headspace sample tray 11, the bidirectional screw rod 73 is fixed in a limiting guide slot 74 of the headspace fixing frame and connected to a headspace motor 12, threads with opposite rotation directions are disposed on upper and lower sides of the bidirectional screw rod along a length direction, an upper nut seat and a lower nut seat matched with the threads are respectively sleeved on two sides of the bidirectional screw rod, the upper nut seat is connected to the sample heating block, and the lower nut seat is connected to the headspace sample injection needle. The transmission is carried out by using a bidirectional screw rod, and the descending of the headspace heating body 13 and the ascending of the headspace motor assembly 15 can be realized by using only one headspace motor 12, so that the headspace heating body 13 is close to the sample bottle 43 and the headspace sampling needle is communicated with the sample bottle 43.
Referring to fig. 1 to 6, the air sampling assembly 20 includes an analysis sample tray 21 and an analysis fixing frame, the analysis sample tray 21 is disposed below the headspace sample tray 11, an analysis tube 53 is disposed in the analysis sample tray 21, the second transmission assembly includes a bidirectional lead screw 73, the analysis fixing frame is provided with a limiting guide groove 74, the bidirectional lead screw 73 is fixed in the limiting guide groove 74 and connected to the analysis motor 22, the upper and lower sides of the bidirectional lead screw 73 along the length direction are respectively provided with threads with opposite turning directions, two sides of the bidirectional lead screw 73 are respectively sleeved with a first nut seat 71 and a second nut seat 72 which are matched with the threads, and the first nut seat 71 and the second nut seat 72 are slidably disposed in the limiting guide groove 74; the first nut seat 71 and the second nut seat 72 are respectively connected with two ends of the heating body through a pivotable connecting rod, the first nut seat 71 is connected with the first analysis sample injection needle 25, and the second nut seat 72 is connected with the second analysis sample injection needle 25. The use of the bidirectional screw 73 enables the analytical heating body 23 to be brought close to the analytical tube 53 and communicate with the analytical needle 25 through the analytical tube 53 by using only one analytical motor 22.
Referring to fig. 1 to 6, the liquid sample injection assembly 10 further includes a headspace driving motor 14, the headspace driving motor 14 is used for driving the headspace sample tray 11 to rotate, a headspace sensor is further disposed at a predetermined heating position below the headspace sample tray 11, and the headspace sensor is connected to the headspace driving motor 14. When the headspace sensor senses the sample bottle 43, the headspace drive motor 14 is stopped so that the sample bottle 43 reaches a predetermined heating position. The sample bottle 43 can be automatically positioned, and is safer and more convenient.
Referring to fig. 1 to 6, the air sampling assembly 20 further includes a resolving driving motor 24, the resolving driving motor 24 is used for driving the resolving sample tray 21 to rotate, a predetermined heating position resolving sensor below the resolving sample tray 21 is arranged, and the resolving sensor is connected with the resolving driving motor 24. When the analysis sensor senses the analysis tube 53, the analysis driving sensor stops, so that the analysis tube 53 reaches a preset heating position, the analysis tube 53 can be automatically positioned, and safety and convenience are realized.
The invention adopts a mechanical structure to puncture the analysis tube 53 and heat the sample, is more convenient and faster, can avoid the injury of manual operation, and in addition, adopts a travel switch to control the closing of the driving motor, so that the analysis heating body 23 can accurately heat the sample at a preset position.
The technical features of the present invention, which are not described in the present application, can be implemented by or using the prior art, and are not described herein again, and of course, the above description is not limited to the above examples, and the present invention is not limited to the above examples, and variations, modifications, additions and substitutions which can be made by those skilled in the art within the spirit of the present invention should also fall within the scope of the present invention.
Claims (7)
1. The utility model provides a handle preceding all-in-one of environmental air sample and liquid sample which characterized in that includes:
the analysis sampling device comprises a shell, a gas chromatograph and a gas analyzer, wherein a headspace sampling channel and an analysis sampling channel are arranged in the shell, a headspace six-way valve is arranged in the headspace sampling channel, an analysis six-way valve is arranged in the analysis sampling channel, and a carrier gas outlet of the gas chromatograph is sequentially communicated with the headspace six-way valve, the analysis six-way valve and a sampling port of the gas chromatograph;
the liquid sample injection assembly comprises a sample bottle and a top bottle motor, and the top bottle motor drives the sample bottle to be communicated with the headspace six-way valve;
the air sampling assembly comprises an analytic tube and an analytic motor, and the analytic motor drives the analytic tube to be communicated with the analytic six-way valve;
and the controller is connected with and controls the headspace six-way valve, the analysis six-way valve, the top bottle motor and the analysis motor.
2. The integrated pretreatment machine for processing the ambient air sample and the liquid sample according to claim 3, wherein the liquid sample injection assembly comprises a sample bottle, a head bottle motor and a first transmission assembly, the sample bottle is connected with the head space six-way valve, the head bottle motor drives a head space sample injection needle and a head space heating body through the first transmission assembly, the head space sample injection needle is connected with the head space sample injection channel, the first transmission assembly is provided with a travel switch connected with the head bottle motor, and when the head space sample injection needle is communicated with the sample bottle, the travel switch is triggered.
3. The integrated pretreatment machine according to claim 2, wherein the air sampling assembly comprises an analyzing tube, an analyzing motor and a second transmission assembly, the analyzing tube is connected to the analyzing six-way valve, the analyzing motor drives an analyzing sampling needle and an analyzing heating body through the second transmission assembly, the analyzing sampling needle is connected to the analyzing sampling channel, the second transmission assembly is provided with a travel switch connected to the analyzing motor, and when the analyzing sampling needle is communicated with the analyzing tube, the travel switch is triggered.
4. The pretreatment integrated machine for processing an ambient air sample and a liquid sample according to claim 3, wherein the liquid sample feeding assembly comprises a headspace sample tray and a headspace fixing frame, the first transmission assembly comprises a bidirectional screw rod, sample bottles are arranged in the headspace sample tray, the bidirectional screw rod is fixed in a limiting guide groove of the headspace fixing frame and is connected with the headspace bottle motor, threads with opposite rotation directions are respectively arranged on the upper side and the lower side of the bidirectional screw rod along the length direction, an upper nut seat and a lower nut seat matched with the threads are respectively sleeved on the two sides of the bidirectional screw rod, the upper nut seat is connected with the sample heating block, and the lower nut seat is connected with the headspace sample feeding needle.
5. The all-in-one pretreatment device for processing the environmental air sample and the liquid sample according to claim 4, wherein the air sampling assembly comprises an analytic sample tray and an analytic fixing frame, the analytic sample tray is arranged below the headspace sample tray, an analytic tube is arranged in the analytic sample tray, the second transmission assembly comprises a bidirectional lead screw, a limiting guide groove is arranged on the analytic fixing frame, the bidirectional lead screw is fixed in the limiting guide groove and connected with the analytic motor, the upper side and the lower side of the bidirectional lead screw along the length direction are respectively provided with threads with opposite rotation directions, the two sides of the bidirectional lead screw are respectively sleeved with a first nut seat and a second nut seat which are matched with the threads, and the first nut seat and the second nut seat are slidably arranged in the limiting guide groove; the first nut seat and the second nut seat are respectively connected with two ends of the heating body through a pivotable connecting rod, the first nut seat is connected with a first analysis sample injection needle, and the second nut seat is connected with a second analysis sample injection needle.
6. The all-in-one pretreatment machine for processing the ambient air sample and the liquid sample according to claim 4, wherein the liquid sample injection assembly further comprises a headspace driving motor, the headspace driving motor is used for driving the headspace sample tray to rotate, a headspace sensor is further arranged at a predetermined heating position below the headspace sample tray, and the headspace sensor is connected with the headspace driving motor.
7. The integrated pre-processing machine according to claim 5, wherein the air sample injection assembly further comprises a desorption driving motor, the desorption driving motor is used for driving the desorption sample tray to rotate, a desorption sensor is arranged at a preset heating position below the desorption sample tray, and the desorption sensor is connected with the desorption driving motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210727398.3A CN115684434A (en) | 2022-06-24 | 2022-06-24 | Pretreatment all-in-one machine for processing environmental air sample and liquid sample |
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| CN115980378A (en) * | 2023-03-07 | 2023-04-18 | 北京聚芯追风科技有限公司 | Full-automatic multi-station recovery function thermal desorption instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115980378A (en) * | 2023-03-07 | 2023-04-18 | 北京聚芯追风科技有限公司 | Full-automatic multi-station recovery function thermal desorption instrument |
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