A pretreatment all-in-one machine for processing ambient air samples and liquid samples

Abstract

The present invention provides an all-in-one pre-treatment machine for processing ambient air samples and liquid samples, comprising: a housing, a headspace sampling channel and a desorption sampling channel provided in the housing, a headspace six-way valve provided in the headspace sampling channel, a desorption six-way valve provided in the desorption sampling channel, a carrier gas outlet of a gas chromatograph being connected to the headspace six-way valve, the desorption six-way valve, and the sampling port of the gas chromatograph in sequence; a liquid sampling assembly comprising a sample bottle and a bottle-lifting motor, the bottle-lifting motor driving the sample bottle to be connected to the headspace six-way valve; an air sampling assembly comprising a desorption tube and a desorption motor, the desorption motor driving the desorption tube to be connected to the desorption six-way valve; and a controller connecting and controlling the headspace six-way valve, the desorption six-way valve, the bottle-lifting motor, and the desorption motor. The present invention solves the problems of inconvenient operation and unsafety in the prior art when using a headspace sampler and thermal desorption to analyze ambient air samples and liquid samples.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental analysis, and in particular relates to an all-in-one pre-processing machine for processing environmental air samples and liquid samples. Background Art

[0002] Thermal desorption is called thermal analysis or thermal desorption in China. It is a fully automatic pretreatment equipment for ambient air samples. The collected sample tube is placed in the thermal desorption, and the sample pipeline is sealed and heated. Then, the sample analyzed in the sample tube is introduced into the gas chromatograph for analysis through the switching of the valve body.

[0003] The headspace sampler is a fully automatic pretreatment device for liquid samples in the environment. It places the liquid sample into a special headspace bottle and heats the liquid sample in the headspace bottle. The organic gas in the liquid sample will release volatile organic compounds at a certain temperature and achieve vapor-liquid equilibrium. Then, the sample released from the upper part of the headspace bottle is introduced into the gas chromatograph for analysis through the switching of the valve body.

[0004] Currently, thermal desorption and headspace samplers on the market are independent devices. There are two situations. First, a gas chromatograph cannot be used with a headspace sampler when using thermal desorption. The injection pipeline needs to be replaced before it can continue to be used. The operation is cumbersome, and improper replacement may easily cause leakage and make it unusable. Second, the two devices need to be connected to two gas chromatographs separately, which is costly and takes up a lot of space.

[0005] The current headspace sampler and thermal desorption equipment have complex structures, are difficult to operate, have low automation levels, and are not safe enough. Summary of the Invention

[0006] The purpose of the present invention is to provide an all-in-one pre-processing machine for processing ambient air samples and liquid samples, which solves the problems of inconvenient operation and unsafe operation when using head space sampler and thermal desorption to analyze ambient air samples and liquid samples in the prior art.

[0007] The present invention provides an all-in-one pre-processing machine for processing ambient air samples and liquid samples, comprising a housing, a headspace sampling channel and a desorption sampling channel provided in the housing, a headspace six-way valve provided in the headspace sampling channel, a desorption six-way valve provided in the desorption sampling channel, a carrier gas outlet of a gas chromatograph being sequentially connected to the headspace six-way valve, the desorption six-way valve, and the sampling port of the gas chromatograph;

[0008] The liquid sampling assembly includes a sample bottle and a bottle-lifting motor, wherein the bottle-lifting motor drives the sample bottle to communicate with the headspace six-way valve;

[0009] The air sampling assembly includes a desorption tube and a desorption motor, wherein the desorption motor drives the desorption tube to communicate with the desorption six-way valve;

[0010] The controller is connected to and controls the headspace six-way valve, the analytical six-way valve, the bottle-top motor, and the analytical motor.

[0011] Preferably, the liquid injection assembly also includes a first transmission assembly, the sample bottle is connected to the head space six-way valve, the bottle-top motor drives the head space injection needle and the head space heater through the first transmission assembly, the head space injection needle is connected to the head space injection channel, and the first transmission assembly is provided with a travel switch connected to the bottle-top motor. When the head space injection needle is connected to the sample bottle, the travel switch is triggered.

[0012] Preferably, the air sampling assembly also includes a second transmission assembly, the analysis tube is connected to the analysis six-way valve, the analysis motor drives the analysis injection needle and the analysis heating body through the second transmission assembly, the analysis injection needle is connected to the analysis injection channel, and a travel switch connected to the analysis motor is provided on the second transmission assembly. When the analysis injection needle is connected to the analysis tube, the travel switch is triggered.

[0013] Preferably, the liquid injection assembly includes a head space sample tray and a head space fixing frame, the first transmission assembly includes a bidirectional screw, a sample bottle is arranged in the head space sample tray, the bidirectional screw is fixed in the limiting guide groove of the head space fixing frame and is connected to the bottle top motor, the bidirectional screw is provided with threads of opposite rotation directions on the upper and lower sides along the length direction, and the upper nut seat and the lower nut seat adapted to the threads are respectively provided on both sides of the bidirectional screw, the upper nut seat is connected to the sample heating block, and the lower nut seat is connected to the head space injection needle.

[0014] Preferably, the air sampling assembly includes an analytical sample tray and an analytical fixing frame. The analytical sample tray is arranged below the head space sample tray. An analytical tube is arranged in the analytical sample tray. The second transmission assembly includes a bidirectional screw. A limiting guide groove is provided on the analytical fixing frame. The bidirectional screw is fixed in the limiting guide groove and connected to the analytical motor. The bidirectional screw is respectively provided with threads of opposite rotation directions on the upper and lower sides along the length direction. The two sides of the bidirectional screw are respectively provided with a first nut seat and a second nut seat adapted to the threads. The first nut seat and the second nut seat can be slidably arranged in the limiting guide groove; the first nut seat and the second nut seat are respectively connected to the two ends of the heating body through a pivotable connecting rod. The first nut seat is connected to the first analytical injection needle, and the second nut seat is connected to the second analytical injection needle.

[0015] Preferably, the liquid injection assembly further comprises a head space drive motor, which is used to drive the head space sample tray to rotate. A head space sensor is also provided at a predetermined heating position below the head space sample tray, and the head space sensor is connected to the head space drive motor.

[0016] Preferably, the air sampling assembly further comprises a parsing drive motor, which is used to drive the parsing sample tray to rotate, and a parsing sensor at a predetermined heating position below the parsing sample tray, and the parsing sensor is connected to the parsing drive motor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The two pre-treatment equipment, ambient air treatment equipment and ambient liquid treatment equipment, are combined into one, which is small in size and multi-functional. One sample pipeline is used to solve the problem of analysis on the same gas chromatograph, without frequently replacing the pipeline of the chromatographic inlet. The ambient air sample and the ambient liquid sample are switched in the same pipeline, so there will be no problems such as air leakage caused by changing the gas line.

[0019] (2) The present invention redesigns the structure of the liquid sampling assembly and the air sampling assembly, and uses a controller to control the headspace six-way valve, the analytical six-way valve, the bottle-top motor and the analytical motor, thereby automating the process of replacing the gas path, which is simple, safe and efficient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an isometric view of an assembly of an all-in-one pre-processing machine for processing ambient air samples and liquid samples in an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 Assembly drawing of the liquid sampling component and the air sampling component.

[0022] Figure 3 yes Figure 2 Schematic diagram of the structure of the liquid injection component shown.

[0023] Figure 4 yes Figure 2 The schematic diagram of the structure of the air sampling component is shown.

[0024] Figure 5 It is a schematic diagram of the gas path structure of the head space sampling channel and the analytical sampling channel of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the analytical sample injection component of the present invention.

[0026] The accompanying drawings are numerals as follows:

[0027] 10. Liquid injection assembly; 11. Headspace sample tray; 12. Bottle lift motor; 13. Headspace heater; 14. Headspace drive motor; 15. Bottle lift motor assembly; 20. Air injection assembly; 21. Desorption sample tray; 22. Desorption motor; 23. Desorption heating block; 24. Desorption drive motor; 25. Desorption injection needle; 30. Carrier gas outlet; 40. Headspace injection channel; 41. Headspace six-way valve; 42. Quantitative tube; 43. Sample bottle; 44. First solenoid valve; 45. Headspace exhaust port; 46. Carrier gas outlet; 50. Desorption injection channel; 51. Desorption six-way valve; 52. Cold trap tube; 53. Desorption tube; 54. Second solenoid valve; 55. Desorption exhaust port; 56. Inlet; 60. Housing; 61. Observation window; 62. Operation screen. 71. First nut seat; 72. Second nut seat; 73. Bidirectional screw rod; 74. Limit guide groove. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical features of this solution, the following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "liquid level", "vertical", "liquid level", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the present invention, unless otherwise expressly specified or limited, terms such as "mounted", "connected", "connected", and "fixed" should be understood in a broad sense. For example, they can mean fixed connection, detachable connection, or integration; they can mean direct connection or indirect connection through an intermediate medium; they can mean internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] refer to Figures 1 to 5The present invention provides an integrated pre-processing device for processing ambient air samples and liquid samples, comprising: a housing 60, a headspace sampling channel 40 and a desorption sampling channel 50 provided in the housing 60, a headspace six-way valve 41 provided in the headspace sampling channel 40, a desorption six-way valve 51 provided in the desorption sampling channel 50, a carrier gas outlet 4630 of a gas chromatograph being sequentially connected to the headspace six-way valve 41, the desorption six-way valve 51, and an inlet 56 of the gas chromatograph;

[0031] The liquid injection assembly 10 includes a sample bottle 43 and a bottle-lifting motor 12. The bottle-lifting motor 12 drives the sample bottle 43 to communicate with the headspace six-way valve 41.

[0032] The air sampling assembly 20 includes a desorption tube 53 and a desorption motor 22. The desorption motor 22 drives the desorption tube 53 to communicate with the desorption six-way valve 51.

[0033] The controller is connected to and controls the headspace six-way valve 41 , the analytical six-way valve 51 , the bottle-lifting motor 12 , and the analytical motor 22 .

[0034] The housing 60 is also provided with an operation screen 62, which is used to operate the controller. Figure 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 desorption six-way valve 51, and the first interface of the desorption six-way valve 51 is connected to the injection port 56 of the gas chromatograph. By adjusting the sealing component of the headspace six-way valve 41, the carrier gas outlet 30, the sample bottle 43 and the injection port 56 can be connected. By adjusting the sealing component of the desorption six-way valve 51, the carrier gas outlet 30, the desorption tube 53 and the injection port 56 can be connected.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The two pre-treatment equipment, ambient air treatment equipment and ambient liquid treatment equipment, are combined into one, which is small in size and multi-functional. One sample pipeline is used to solve the problem of analysis on the same gas chromatograph, without frequently replacing the pipeline of the chromatographic inlet. The ambient air sample and the ambient liquid sample are switched in the same pipeline, so there will be no problems such as air leakage caused by changing the gas line.

[0037] (2) The present invention redesigns the structure of the liquid sampling assembly and the air sampling assembly, and uses a controller to control the headspace six-way valve, the analytical six-way valve, the bottle-top motor and the analytical motor, thereby automating the process of replacing the gas path, which is simple, safe and efficient to operate.

[0038] refer to Figure 5, a plurality of first solenoid valves 44 are provided in the head space injection channel 40, and a plurality of second solenoid valves 54 are provided in the analytical injection channel 50. By adjusting these first solenoid valves 44, second solenoid valves 54 and the head space six-way valve 41 and analytical six-way valve 51, three operating modes can be realized: pressurized mode, normal pressure mode, and negative pressure mode, which are described below respectively:

[0039] 1. Operating status of the headspace: (pressurization mode)

[0040] The gas chromatograph's carrier gas enters from port 2 of the six-way headspace valve and exits from port 1. It also enters from port 2 of the six-way analytical valve and exits from port 1. The sample tray automatically locates the sample location via a sensor based on custom settings (this product is 20-position automatic; expanding the sample tray increases the number of sample positions). The bottle-lifting motor 12 moves upward, moving the sample bottle 43 to the headspace heating chamber for equilibrium. The V2 solenoid valve 44 opens, and the headspace sampling line is purged and cleaned according to a custom time. When the purge time is over, the V2 solenoid valve 44 closes. When the equilibrium time is over, the bottle-lifting motor 12 continues to move upward, and the headspace sampling needle pierces the sealing gasket of the sample bottle 43 and stops moving. The V2 solenoid valve 44 opens, and high-pressure gas enters from port 4 of the six-way headspace valve and exits from port 3. It passes through the quantitative loop, enters from port 6, and exits from port 5. The sample bottle 43 is pressurized and balanced, and the V2 solenoid valve 44 is closed. Open the V4 solenoid valve 44, and the high-pressure vaporized sample in the sample bottle 43 enters the 5th port of the headspace six-way valve through the headspace injection needle, exits from the 6th port, passes through the quantitative tube 42, enters from the 3th port, and exits from the 4th port. The pressure in the sample bottle 43 is released to the same level as the atmospheric pressure, and the V4 solenoid valve 44 is closed. Rotate the headspace six-way valve, and the carrier gas enters from the 2nd port, exits from the 3rd port, passes through the quantitative tube 42, enters from the 6th port, exits from the 1st port, enters the 2nd port of the analytical six-way valve, and exits from the 1st port. The sample enters the gas chromatograph for analysis, and the set analysis time is started at the same time. When the injection is completed, the headspace six-way valve is rotated and reset. When the analysis time is over, the bottle-top motor 12 returns to the zero position, and the sample bottle 43 is returned to the original sample position. The sample tray automatically rotates to the next position, and the above steps are repeated.

[0041] 2. Operating status of the headspace: (normal pressure mode)

[0042] The gas chromatograph carrier gas enters port 2 of the headspace six-way valve 41 and exits port 1. It then enters port 2 of the analytical six-way valve 51 and exits port 1. The sample tray automatically locates the sample location using a sensor based on custom settings (this product automatically positions 20; expanding the sample tray can increase the number of sample locations). The bottle-lifting motor 12 moves upward, moving the sample bottle 43 into the headspace heating chamber for equilibration. The V2 solenoid valve 44 opens, purging and cleaning the headspace sampling line according to a custom time. Upon completion of the purge time, the V2 solenoid valve 44 closes. Upon completion of the equilibration time, the bottle-lifting motor 12 continues to move upward, and the headspace sampling needle pierces the seal of the sample bottle 43, stopping. The V4 solenoid valve 44 opens, allowing the high-pressure vaporized sample in the sample bottle 43 to enter port 5 of the headspace six-way valve 41 through the headspace sampling needle and exit through port 6. The sample passes through the quantitative tube 42, enters port 3, and exits port 4. The pressure in the sample bottle 43 is released to atmospheric pressure, and the V4 solenoid valve 44 closes. The headspace six-way valve 41 rotates, and the carrier gas enters from port 2 and exits from port 3. It then passes through the quantitative tube 42, enters from port 6, and exits from port 1. The carrier gas then enters port 2 of the analytical six-way valve 51 and exits from port 1. The sample enters the gas chromatograph for analysis, and the set analysis time begins. When the injection is complete, the headspace six-way valve 41 rotates back to its original position. The analysis time expires, and the bottle motor 12 returns to zero, simultaneously returning the sample bottle 43 to its original position. The sample tray automatically rotates to the next position, and the above process repeats. Finally, exhaust is exhausted from the headspace exhaust port 45.

[0043] 3. Operating status of the headspace: (negative pressure mode)

[0044] The carrier gas for the gas chromatography enters from port 2 of the headspace six-way valve 41 and exits from port 1. It also enters from port 2 of the analytical six-way valve 51 and exits from port 1. The sample tray automatically searches for the sample location through a sensor according to the custom settings (this product is 20-position automatic, and the sample tray can be expanded to increase the sample position). The bottle-lifting motor 12 moves upward, moves the sample bottle 43 to the headspace heating block 13 for equilibrium, opens the V2 solenoid valve 44, and purges and cleans the headspace sampling line according to the custom time. When the purge time is over, the V2 solenoid valve 44 is closed. When the equilibrium time is over, the bottle-lifting motor 12 continues to move upward, and the headspace sampling needle pierces the sealing gasket of the sample bottle 43 and stops moving. Open V7 solenoid valve 44 and simultaneously activate the negative pressure pump. The vaporized sample in sample bottle 43 enters port 5 of headspace six-way valve 41 through the headspace injection needle, exits port 6, passes through quantitative tube 42, enters port 3, and exits port 4, reducing the pressure in sample bottle 43 to a negative pressure state. Close V7 solenoid valve 44 and simultaneously deactivate the negative pressure pump. Rotate headspace six-way valve 41, allowing carrier gas to enter port 2 and exit port 3, pass through quantitative tube 42, enter port 6, and exit port 1, then enter port 2 of analytical six-way valve 51 and exit port 1. The sample enters the gas chromatograph for analysis, and the set analysis time begins. When the injection is completed, the headspace six-way valve 41 rotates back to its original position. When the analysis time expires, the bottle-lifting motor 12 returns to zero, and the sample bottle 43 is returned to its original sample position. The sample tray automatically rotates to the next position, and the above steps are repeated.

[0045] refer to Figure 5 The analytical injection channel includes a plurality of analytical solenoid valves 54. By adjusting these analytical solenoid valves 54 and the analytical six-way valve 51, the analytical part operation state can be achieved. The specific steps are as follows:

[0046] The GC carrier gas enters port 2 of the headspace six-way valve 41 and exits port 1. It then enters port 2 of the desorption six-way valve 51 and exits port 1. The sample tray automatically locates the sample location using a sensor based on custom settings (this product has 24 positions automatically; expanding the sample tray increases the number of sample positions). The desorption motor 22 operates, driving the desorption injection needle 25 synchronously inward via the forward and reverse screws, puncturing the seal and clamping the primary desorption tube 53. Simultaneously, the heating block moves forward to heat the desorption tube 53. The V5 and V6 solenoid valves 44 open, and the enriched gas exits through V5, passing the sample from the primary desorption tube 53 to port 5 of the desorption six-way valve 51. It exits through port 6 and enters the cold trap tube 52 in the cryogenic trap for enrichment. The sample enters port 3 and exits through port 4. The enriched gas is then discharged through the V6 solenoid valve 44. At the end of the enrichment period, the V5 and V6 solenoid valves 44 close. The six-way desorption valve 51 rotates, and carrier gas enters port 2 of the six-way desorption valve 51 and exits port 1. The carrier gas then enters port 2 of the six-way desorption valve 51, exits port 3, passes through the cold trap tube 52, enters port 6, and exits port 1. The sample enters the gas chromatograph for analysis, and the set analysis time begins. When the injection is complete, the six-way desorption valve 51 rotates back to its original position. The V3 and V8 solenoid valves 44 are opened, and gas enters port 4 of the six-way desorption valve 51 from the V3 solenoid valve 44, exits port 3, passes through the cold trap tube 52, enters port 6, exits port 5, passes through the primary desorption tube 53, and enters the V8 solenoid valve 44 for discharge. The activation time is complete, and the V3 and V8 solenoid valves 44 are closed. The analysis time ends, and the two-way screw drives the desorption injection needle 25 to move outward synchronously. The desorption heating block 23 moves backward to cool the desorption tube 53. The desorption sample tray 21 automatically rotates to the next position, and the above process repeats. Finally, exhaust is exhausted from the desorption exhaust port 55.

[0047] refer to Figures 1 to 6 In one embodiment, the liquid sampling assembly 10 includes a sample bottle 43, a bottle-lifting motor 12, and a first transmission assembly. The sample bottle 43 is connected to a six-way headspace valve 41. The bottle-lifting motor 12 drives a headspace sampling needle and a headspace heater 13 through the first transmission assembly. The headspace sampling needle is connected to a headspace sampling channel 40. The first transmission assembly is provided with a travel switch connected to the bottle-lifting motor 12. When the headspace sampling needle is connected to the sample bottle 43, the travel switch is triggered. The travel switch can control the bottle-lifting motor 12 to automatically stop, thereby stopping the headspace heater 13 after reaching a predetermined heating position, thereby safely and accurately heating the sample bottle 43.

[0048] refer to Figures 1 to 6The air sampling assembly 20 includes a desorption tube 53, a desorption motor 22, and a second transmission assembly. The desorption tube 53 is connected to the desorption six-way valve 51. The desorption motor 22 drives the desorption injection needle 25 and the desorption heater 23 through the second transmission assembly. The desorption injection needle 25 is connected to the desorption injection channel 50. The second transmission assembly is provided with a limit switch connected to the desorption motor 22. When the desorption injection needle 25 is connected to the desorption tube 53, the limit switch is triggered. The limit switch can control the desorption motor 22 to automatically stop, thereby stopping the desorption heater 23 when it reaches the predetermined heating position, thereby safely and accurately heating the desorption tube 53.

[0049] refer to Figures 1 to 6 The liquid injection assembly 10 includes a headspace sample tray 11 and a headspace fixing frame. The first transmission assembly includes a bidirectional screw. A sample bottle 43 is set in the headspace sample tray 11. The bidirectional screw 73 is fixed in the limiting guide groove 74 of the headspace fixing frame and is connected to the bottle-lifting motor 12. The bidirectional screw is provided with threads with opposite rotation directions on the upper and lower sides along the length direction. The two sides of the bidirectional screw are respectively provided with an upper nut seat and a lower nut seat adapted to the threads. The upper nut seat is connected to the sample heating block, and the lower nut seat is connected to the headspace injection needle. Using the bidirectional screw for transmission, only one bottle-lifting motor 12 can be used to achieve the descent of the headspace heating body 13 and the rise of the bottle-lifting motor assembly 15, thereby achieving the headspace heating body 13 close to the sample bottle 43 and the headspace injection needle connecting to the sample bottle 43.

[0050] refer to Figures 1 to 6 The air sampling assembly 20 includes an analytical sample tray 21 and an analytical fixing frame. The analytical sample tray 21 is arranged below the head space sample tray 11. An analytical tube 53 is arranged in the analytical sample tray 21. The second transmission assembly includes a bidirectional screw rod 73. A limiting guide groove 74 is provided on the analytical fixing frame. The bidirectional screw rod 73 is fixed in the limiting guide groove 74 and is connected to the analytical motor 22. The bidirectional screw rod 73 is respectively provided with threads of opposite rotation directions on the upper and lower sides along the length direction. The two sides of the bidirectional screw rod 73 are respectively provided with a first nut seat 71 and a second nut seat 72 that are adapted to the threads. The first nut seat 71 and the second nut seat 72 are slidably arranged in the limiting guide groove 74; the first nut seat 71 and the second nut seat 72 are respectively connected to the two ends of the heating body by a pivotable connecting rod. The first nut seat 71 is connected to the first analytical injection needle 25, and the second nut seat 72 is connected to the second analytical injection needle 25. The use of the bidirectional screw rod 73 can achieve the purpose of using only one analytical motor 22 to move the analytical heating body 23 close to the analytical tube 53 and connect the analytical injection needle 25 to the analytical tube 53.

[0051] refer to Figures 1 to 6The liquid sampling assembly 10 further includes a headspace drive motor 14 for driving the headspace sample tray 11 to rotate. A headspace sensor is provided at a predetermined heating position below the headspace sample tray 11 and is connected to the headspace drive motor 14. When the headspace sensor senses a sample bottle 43, the headspace drive motor 14 stops, and the sample bottle 43 reaches the predetermined heating position. This allows the sample bottle 43 to be automatically positioned, making it safer and more convenient.

[0052] refer to Figures 1 to 6 The air sampling assembly 20 further includes a desorption drive motor 24, which is used to drive the desorption sample tray 21 to rotate and to locate a desorption sensor at a predetermined heating position below the desorption sample tray 21. The desorption sensor is connected to the desorption drive motor 24. When the desorption sensor senses the desorption tube 53, the desorption drive sensor stops, and the desorption tube 53 reaches the predetermined heating position. The desorption tube 53 can be automatically positioned safely and conveniently.

[0053] The present invention adopts a mechanical structure to puncture the analysis tube 53 and heat the sample, which is more convenient and quick, and can also avoid injuries caused by manual operation. In addition, a limit switch is used to control the shutdown of the drive motor so that the analysis heating body 23 can heat the sample accurately at the predetermined position.

[0054] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A pre-processing integrated machine for processing ambient air samples and liquid samples, characterized in that: include: A shell is provided in which a head space injection channel and a desorption injection channel are provided, a head space six-way valve is provided in the head space injection channel, a desorption six-way valve is provided in the desorption injection channel, and a carrier gas outlet of a gas chromatograph is connected with the head space six-way valve, the desorption six-way valve and the injection port of the gas chromatograph in sequence; a liquid injection component includes a sample bottle and a bottle-top motor, the bottle-top motor drives the sample bottle to be connected with the head space six-way valve; an air injection component includes a desorption tube and a desorption motor, the desorption motor drives the desorption tube to be connected with the desorption six-way valve; a controller is connected to and controls the head space six-way valve, the desorption six-way valve, the bottle-top motor and the desorption motor.

2. The all-in-one pre-processing machine for processing ambient air samples and liquid samples according to claim 1, characterized in that: The liquid injection assembly also includes a first transmission assembly, the sample bottle is connected to the head space six-way valve, the bottle-top motor drives the head space injection needle and the head space heater through the first transmission assembly, the head space injection needle is connected to the head space injection channel, and the first transmission assembly is provided with a travel switch connected to the bottle-top motor. When the head space injection needle is connected to the sample bottle, the travel switch is triggered.

3. The all-in-one pre-processing machine for processing ambient air samples and liquid samples according to claim 2, characterized in that: The air sampling assembly also includes a second transmission assembly. The analysis tube is connected to the analysis six-way valve. The analysis motor drives the analysis injection needle and the analysis heating body through the second transmission assembly. The analysis injection needle is connected to the analysis injection channel. The second transmission assembly is provided with a travel switch connected to the analysis motor. When the analysis injection needle is connected to the analysis tube, the travel switch is triggered.

4. The all-in-one pre-processing machine for processing ambient air samples and liquid samples according to claim 3, characterized in that: The liquid injection assembly includes a head space sample tray and a head space fixing frame, the first transmission assembly includes a bidirectional screw, a sample bottle is arranged in the head space sample tray, the bidirectional screw is fixed in the limiting guide groove of the head space fixing frame and is connected to the bottle-top motor, the bidirectional screw is respectively provided with threads of opposite rotation directions on the upper and lower sides along the length direction, and the two sides of the bidirectional screw are respectively provided with an upper nut seat and a lower nut seat adapted to the threads, the upper nut seat is connected to the sample heating block, and the lower nut seat is connected to the head space injection needle.

5. The all-in-one pre-processing machine for processing ambient air samples and liquid samples according to claim 4, characterized in that: The air sampling assembly includes an analytical sample tray and an analytical fixing frame. The analytical sample tray is arranged below the head space sample tray. An analytical tube is arranged in the analytical sample tray. The second transmission assembly includes a bidirectional screw. A limiting guide groove is provided on the analytical fixing frame. The bidirectional screw is fixed in the limiting guide groove and is connected to the analytical motor. The bidirectional screw is respectively provided with threads of opposite rotation directions on the upper and lower sides along the length direction. The two sides of the bidirectional screw are respectively provided with a first nut seat and a second nut seat adapted to the threads. The first nut seat and the second nut seat can be slidably arranged in the limiting guide groove; the first nut seat and the second nut seat are respectively connected to the two ends of the heating body by a pivotable connecting rod. The first nut seat is connected to the first analytical injection needle, and the second nut seat is connected to the second analytical injection needle.

6. The all-in-one pre-processing machine for processing ambient air samples and liquid samples according to claim 4, characterized in that: The liquid injection assembly further includes a head space drive motor, which is used to drive the head space sample tray to rotate. A head space sensor is also provided at a predetermined heating position below the head space sample tray, and the head space sensor is connected to the head space drive motor.

7. The all-in-one pre-processing machine for processing ambient air samples and liquid samples according to claim 5, characterized in that: The air sampling assembly further includes a resolution driving motor, which is used to drive the resolution sample tray to rotate. A resolution sensor is provided at a predetermined heating position below the resolution sample tray, and the resolution sensor is connected to the resolution driving motor.

Images