Multilayer rotating disc type headspace sampling device and gas detection system

Abstract

The invention relates to a multi-layer rotating disc type headspace sampling device which comprises a sampling machine main body and a multi-layer rotating disc mechanism, the multi-layer rotating disc mechanism comprises a fixed base arranged outside the sampling machine main body, the fixed base is arranged below a sampling needle of the sampling machine main body, a rotating disc is arranged in the fixed base, the rotating disc is driven by a motor and a driving gear, a plurality of layered placing seats are arranged on the upper surface of the rotating disc, and the layered placing seats are arranged on the upper surface of the rotating disc. The plurality of layered placing seats are annularly distributed at equal intervals; the layered placing base comprises a bottom cylinder, and a placing cylinder capable of vertically moving is arranged in the bottom cylinder. Through the arrangement of the bottom cylinder, the placing cylinder and the moving frame, the effect that a circle of headspace bottles can be layered is achieved, elastic deformation of an elastic piece is generated by extruding a stirring block, a tooth-shaped clamping block is separated from a clamping tooth-shaped face, at the moment, the placing cylinder can be vertically moved, and the headspace bottles can be layered through the height of the placing cylinder.

Description

Technical Field

[0001] This invention relates to the field of headspace sampler technology, specifically to a multi-layer rotary headspace sampling device and a gas detection system. Background Technology

[0002] Headspace sampling is a technique used to extract gaseous substances from the top space of a sample container. It is mainly used to analyze volatile compounds in liquid and solid samples. In headspace sampling, the sample to be tested is placed in a sealed container, and the volatile components are volatilized from the sample matrix by heating. Equilibrium is reached in the gas-liquid (or gas-solid) two-phase system, and then the top gas is directly extracted for chromatographic analysis, thereby detecting the composition and content of volatile components in the sample.

[0003] A rotary headspace sampler moves different headspace vials from the same batch to below the injection needle via a rotary table. The headspace vial is then lifted by a telescopic rod, allowing the sampling needle to penetrate the vial cap and extend into the headspace vial for sampling. The headspace vials are arranged in only one layer along the outer edge of the rotary table. When sampling and testing multiple samples from the same batch, for example, samples A, B, and C are placed alternately, and the arrangement is such that A, B, C, and C are placed in a group along the outer edge of the rotary table in a cyclical manner. In practical use, the above-mentioned method of placing multiple samples at intervals usually requires labeling the headspace vials to distinguish between them. However, since non-disposable headspace vials need to be cleaned after use, the labels are difficult to clean completely and residues are easily left, affecting the subsequent application of other labels. If no labels are applied, it is not easy to distinguish between different samples. Therefore, a multi-layer rotary headspace sampling device and gas detection system are proposed to solve the above-mentioned problems. Summary of the Invention

[0004] Based on the above description, the present invention provides a multi-layer rotary headspace sampler and a gas detection system to solve the problem that existing rotary headspace samplers are not convenient for distinguishing different samples during use.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a multi-layer rotary headspace sampling device, comprising: a sampling machine body and a multi-layer rotary mechanism; The multi-layer turntable mechanism includes a fixed base disposed outside the main body of the sampler. The fixed base is disposed below the sampling needle of the main body of the sampler. A rotating disk is disposed inside the fixed base. The rotating disk is driven by a motor and a drive gear. Multiple layered placement seats are disposed on the upper surface of the rotating disk. The multiple layered placement seats are distributed in a ring at equal intervals. The layered placement base includes a bottom cylinder, and the interior of the bottom cylinder is provided with a placement cylinder that can move vertically.

[0006] A gas detection system includes: an analyzer; The analyzer and the sampling needle of the sampling machine body are connected to each other through a pipe. Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the fixed base includes an upward-facing cup-shaped base. The lower surface inside the cup-shaped base is provided with a positioning hole, a lifting hole, an air inlet, and a mounting frame. The mounting frame is fitted over the air inlet. The lower surface of the cup-shaped base is provided with a hot air inlet pipe that communicates with the air inlet. The other end of the hot air inlet pipe is connected to a hot air blower. A fixing cylinder is provided at the center of the bottom wall inside the cup-shaped base.

[0008] Furthermore, the top of the cup-shaped base is provided with an annular cover, and an annular groove is provided on the side of the annular cover opposite to the cup-shaped base. The top of the annular cover is provided with a support frame and a vertical block. The side of the support frame facing the cup-shaped base is provided with the transmitting end of a photoelectric switch, and the bottom of the cup-shaped base is provided with the receiving end of the photoelectric switch. The receiving end is used to receive the light signal emitted by the transmitting end. The side of the vertical block facing the fixed cylinder is provided with a stop block and a first isosceles trapezoidal block from top to bottom. A gap is provided between the stop block and the first isosceles trapezoidal block. The lower surface of the cup-shaped base is provided with a telescopic top rod located below the lifting hole. The telescopic top rod is used to lift the headspace bottle that has moved to directly below the sampling needle and is located inside the placement cylinder.

[0009] Furthermore, the fixing cylinder includes a hollow cylinder body, a fixing post is provided at the bottom of the hollow cylinder body, the fixing post is connected to the center of the inner bottom wall of the cup-shaped base, and an annular limiting strip with an outer diameter larger than the outer diameter of the hollow cylinder body is provided at the top of the hollow cylinder body. A second isosceles trapezoidal block is provided on the side of the annular limiting strip facing the first isosceles trapezoidal block. The first isosceles trapezoidal block and the second isosceles trapezoidal block are located on the same radial extension line of the annular cover.

[0010] Furthermore, the rotating disk includes a disk body disposed inside the cup-shaped base. The upper surface of the disk body is provided with a central hole. The fixing cylinder is disposed inside the central hole and extends through the central hole to the top of the central hole. A plurality of hemispherical blind holes are provided on the circumferential surface of the disk body. Ball bearings that extend into the annular groove and contact the inner wall of the annular groove are disposed inside the hemispherical blind holes.

[0011] Furthermore, the upper surface of the disk body is provided with multiple push rod holes and multiple optical signal through holes. The multiple push rod holes and optical signal through holes are all distributed in a ring at equal intervals and are arranged alternately. The circumferential surface inside the disk body is provided with a ring toothed surface. The disk body is provided with a drive gear that meshes with the ring toothed surface. The lower surface of the cup-shaped base is provided with a motor whose output shaft extends into the interior of the disk body and is connected to the drive gear. The positioning hole is located directly below the movement path of the push rod hole.

[0012] Furthermore, the bottom cylinder includes a bottom cylinder body disposed on the upper surface of the disc body. The bottom cylinder body has two symmetrically distributed side openings on its circumferential surface. The bottom wall inside the bottom cylinder body has a bottom hole located directly above the top rod hole and communicating with each other. The circumferential surface inside the bottom cylinder body has a locking groove, and the inner wall of the locking groove has a locking tooth-like surface.

[0013] Furthermore, the placement cylinder includes a placement cylinder body disposed inside the bottom cylinder body. Two side openings are provided on the circumferential surface of the placement cylinder body, and the two side openings correspond to the two side openings. A connecting hole is provided on the bottom wall inside the placement cylinder body, located directly above the bottom hole. Two elastic members are provided on the outer surface of the placement cylinder body, with one end penetrating and extending to the outside of the side opening. A toothed locking block is provided on the side of the two elastic members facing the locking groove, which is in close contact with the locking toothed surface. A toggle block is provided at the end of the elastic member penetrating the side opening.

[0014] Furthermore, a movable frame is provided inside the placement cylinder. The movable frame includes a hollow ring located inside the placement cylinder. A side rod is provided on the circumference of the hollow ring, passing through the side opening and the side opening in sequence. A roller is provided at the end of the side rod away from the hollow ring.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This invention comprises a sampling machine body, a multi-layer turntable mechanism, and a multi-layer placement seat. The turntable is driven to rotate by the cooperation of a motor and a drive gear. At the same time, the multi-layer placement seat located on the upper surface of the turntable moves in a circular motion under the drive of the turntable, and the headspace vials located inside the multi-layer placement seat pass under the sampling needle in sequence. During the above process, hot air is introduced into the interior of the mounting frame through the hot air inlet pipe. The hot air enters the interior of the multi-layer placement seat to heat the headspace vials. 2. By setting up the fixed base, fixed cylinder and moving frame, when the moving frame rotates with the rotating disk to directly below the sampling needle, the two rollers contact the inclined sides of the first isosceles trapezoidal block and the second isosceles trapezoidal block respectively, and are lifted under the action of the vertical component force. That is, the moving frame drives the headspace bottle to initially lift to directly below the sampling needle, in preparation for the subsequent movement of the headspace bottle. At this time, the telescopic top rod moves upward to lift the headspace bottle, so that the sampling needle can pierce the bottle cap and extend into the interior of the headspace bottle. 3. By designing the bottom cylinder, placement cylinder, and moving frame, the headspace bottles can be layered. By squeezing the actuating block, the elastic element undergoes elastic deformation, causing the toothed block to separate from the toothed surface. At this point, the placement cylinder can be moved vertically. The height of the placement cylinder allows the headspace bottles to be layered, making it easier for users to distinguish headspace bottles containing different samples. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-layer rotary headspace sampling device and a gas detection system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the multi-layer turntable mechanism in an embodiment of the present invention; Figure 3 for Figure 2 Another structural diagram from another perspective; Figure 4 for Figure 3 Another structural diagram from another perspective; Figure 5 This is a schematic diagram of the structure of the fixed base in an embodiment of the present invention; Figure 6 for Figure 5 Another structural diagram from another perspective; Figure 7 This is a schematic diagram of the structure of the fixed cylinder in an embodiment of the present invention; Figure 8 for Figure 7 Another structural diagram from another perspective; Figure 9 This is a schematic diagram of the rotating disk in an embodiment of the present invention; Figure 10 for Figure 9 Another structural diagram from another perspective; Figure 11 This is a schematic diagram of the structural cooperation between the rotating disk and the driving gear in an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the layered placement seat in an embodiment of the present invention; Figure 13 This is a schematic diagram of the bottom cylinder structure in an embodiment of the present invention; Figure 14This is a schematic diagram of the structure of the placement cylinder in an embodiment of the present invention; Figure 15 This is a schematic diagram of the structure of the mobile frame in an embodiment of the present invention; The attached diagram lists the components represented by each number as follows: 1. Sampling machine body; 2. Fixed base; 21. Cup-shaped base; 22. Positioning hole; 23. Lifting hole; 24. Air inlet; 25. Mounting frame; 26. Annular cover; 27. Annular groove; 28. Support frame; 29. ​​Vertical block; 291. Stop block; 292. First isosceles trapezoidal block; 3. Photoelectric switch; 4. Fixed cylinder; 41. Hollow cylinder body; 42. Fixed column; 43. Annular limit strip; 44. Second isosceles trapezoidal block; 5. Rotating disk; 51. Disk body; 52. Top rod hole; 53. Optical signal through hole; 54. Annular toothed surface; 55. 56. Hemispherical blind hole; 57. Ball bearing; 6. Center hole; 7. Motor; 8. Drive gear; 9. Telescopic top rod; 10. Bottom cylinder; 11. Bottom cylinder body; 12. Bottom hole; 13. Side opening; 14. Locking groove; 15. Locking toothed surface; 10. Placement cylinder; 101. Placement cylinder body; 102. Side opening; 103. Connecting hole; 104. Elastic element; 105. Actuating block; 106. Toothed locking block; 11. Moving frame; 111. Hollow ring; 112. Side rod; 113. Roller; 12. Hot air inlet pipe; 13. Analyzer. Detailed Implementation

[0017] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0019] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0020] Please see Figure 1A gas detection system includes: an analyzer 13, preferably a Picaro G2201-i analyzer; The analyzer 13 and the sampling needle of the sampler body 1 are connected to each other through a pipe; Based on the above, both the analyzer 13 and the sampler body 1 are existing technologies. The key to this technical solution lies in the structure of the turntable. Therefore, the specific internal structure of the analyzer 13 and the sampler body 1 is not described here.

[0021] like Figures 2-4 As shown, a multi-layer rotary headspace sampling device is characterized by comprising: a sampler body 1 and a multi-layer rotary mechanism; The multi-layer turntable mechanism includes a fixed base 2 disposed outside the sampler body 1. The fixed base 2 is disposed below the sampling needle of the sampler body 1. The fixed base 2 includes an upward-facing cup-shaped base 21. The lower surface inside the cup-shaped base 21 is provided with a positioning hole 22, a lifting hole 23, an air inlet 24, and a mounting frame 25. The mounting frame 25 is sleeved outside the air inlet 24. The lower surface of the cup-shaped base 21 is provided with a hot air inlet pipe 12 that communicates with the air inlet 24. The other end of the hot air inlet pipe 12 is connected to a hot air blower. A fixed cylinder 4 is provided at the center of the bottom wall inside the cup-shaped base 21. Based on the above, the positioning hole 22 and the photoelectric switch 3 cooperate to allow the light signal to pass through the positioning hole 22. The lifting hole 23 allows the output end of the telescopic rod 8 to pass through the cup-shaped base 21 and lift the headspace bottle. The mounting frame 25 cooperates with the cup-shaped base 21 and the rotating disk 5 to restrict the space at the air inlet 24. This allows the hot air inlet pipe 12 to pass hot air into the interior of the mounting frame 25 through the air inlet 24, which can then heat the headspace bottle placed inside the layered placement seat. At this time, the mounting frame 25 can delay the overflow of hot air.

[0022] The cup-shaped base 21 has an annular cover 26 on its top. An annular groove 27 is provided on the side of the annular cover 26 opposite to the cup-shaped base 21. A support frame 28 and a vertical block 29 are provided on the top of the annular cover 26. The support frame 28 has a transmitting end of a photoelectric switch 3 on the side facing the cup-shaped base 21. The bottom of the cup-shaped base 21 has a receiving end of the photoelectric switch 3, which is used to receive the light signal emitted by the transmitting end. The vertical block 29 has a stop block 291 and a first isosceles trapezoidal block 292 arranged sequentially from top to bottom on the side facing the fixed cylinder 4. A gap is provided between the stop block 291 and the first isosceles trapezoidal block 292. The lower surface of the cup-shaped base 21 has a telescopic top rod 8 located below the lifting hole 23. The telescopic top rod 8 is used to lift the headspace bottle that has moved to directly below the sampling needle and is located inside the placement cylinder 10. Based on the above, the setting of the annular groove 27 enables the fixed base 2 to cooperate with the ball 56, which on the one hand makes the rotating disk 5 rotate more smoothly, and on the other hand, the two cooperate to restrict the rotating disk 5, preventing the rotating disk 5 from separating from the fixed base 2 after moving upward. The support frame 28 serves to fix the transmitter of the photoelectric switch 3. The receiver is located on the lower surface of the cup-shaped base 21. The transmitter and receiver can still be used normally after their positions are interchanged. At this time, the light signal emitted by the transmitter passes through the positioning hole 22 and is received by the receiver. The telescopic top rod 8 is preferably an electric telescopic rod of model XMSJ DC12V 300mm. The telescopic top rod 8 serves to lift the headspace bottle, so that the sampling needle can penetrate the bottle cap and extend into the interior of the headspace bottle.

[0023] like Figure 2 , Figure 3 , Figure 7 as well as Figure 8 As shown, the fixed cylinder 4 includes a hollow cylinder 41. A fixed post 42 is provided at the bottom of the hollow cylinder 41. The diameter of the fixed post 42 is smaller than the diameter of the hollow cylinder 41. The fixed post 42 is connected to the center of the inner bottom wall of the cup-shaped base 21. An annular limiting strip 43 with an outer diameter larger than the outer diameter of the hollow cylinder 41 is provided at the top of the hollow cylinder 41. A second isosceles trapezoidal block 44 is provided on the side of the annular limiting strip 43 facing the first isosceles trapezoidal block 292. The first isosceles trapezoidal block 292 and the second isosceles trapezoidal block 44 are on the same radial extension line of the annular cover 26. Based on the above, the fixed cylinder 4 guides the multi-layer placement seat, and there is a sufficiently large gap between the fixed column 42 and the cup-shaped base 21 to facilitate the normal movement of the drive gear 7.

[0024] like Figures 2-4 , Figures 9-11 As shown, the fixed base 2 has a rotating disk 5 inside, which is driven by a motor 6 and a drive gear 7. The upper surface of the rotating disk 5 is provided with multiple layered placement seats, which are distributed in a ring at equal intervals. The rotating disk 5 includes a disk body 51 disposed inside the cup-shaped base 21. The upper surface of the disk body 51 is provided with a central hole 57. The fixing cylinder 4 is disposed inside the central hole 57 and extends through the central hole 57 to the top of the central hole 57. A plurality of hemispherical blind holes 55 are provided on the circumferential surface of the disk body 51. The interior of the hemispherical blind holes 55 is provided with ball bearings 56 that extend into the annular groove 27 and contact the inner wall of the annular groove 27. The upper surface of the disk body 51 is provided with a plurality of push rod holes 52 and a plurality of optical signal through holes 53. The plurality of push rod holes 52 and optical signal through holes 53 are all distributed in a ring at equal intervals and are arranged in an alternating pattern. The inner circumferential surface of the disk body 51 is provided with a ring toothed surface 54. The interior of the disk body 51 is provided with a drive gear 7 that meshes with the ring toothed surface 54. The lower surface of the cup-shaped base 21 is provided with a motor 6 whose output shaft extends into the interior of the disk body 51 and is connected to the drive gear 7. A servo motor of model HF-KN23J-S100 is preferred. The positioning hole 22 is located directly below the movement path of the push rod hole 52. Based on the above, when the motor 6 is powered on, it drives the drive gear 7 to rotate. After the drive gear 7 meshes with the annular tooth surface 54, it drives the disc 51 to rotate, which in turn drives the partition placement seat to make a circular motion. During this process, the ball 56 and the annular groove 27 cooperate with each other, so that the disc 51 rotates smoothly enough. The optical signal through-hole 53, the positioning hole 22 and the photoelectric switch 3 cooperate with each other so that after the disk body 51 rotates a constant distance, the optical signal passes through the optical signal through-hole 53 and the positioning hole 22, which enables the photoelectric switch 3 to be connected. The constant distance in the above process is the distance between the two layered placement seats, that is, after the upper layered placement seat leaves the sampling needle, the lower layered placement seat moves to the direct under the sampling needle. When the push rod hole 52 moves to the position of the lifting hole 23 under the drive of the disc body 51, the layer placement seat moves directly below the sampling needle. At this time, the telescopic push rod 8 is powered on and moves upward. Then, the output end of the telescopic push rod 8 passes through the lifting hole 23 and the push rod hole 52 directly above the lifting hole 23 in sequence and extends to the top of the push rod hole 52.

[0025] like Figures 2-4 and Figure 12 As shown, the layered placement base includes a bottom cylinder 9, and a placement cylinder 10 capable of vertical movement is disposed inside the bottom cylinder 9; like Figure 13 As shown, the bottom cylinder 9 includes a bottom cylinder body 91 disposed on the upper surface of the disc body 51. The bottom cylinder body 91 has two symmetrically distributed side openings 93 on its circumferential surface. The bottom wall inside the bottom cylinder body 91 has a bottom hole 92 located directly above the top rod hole 52 and communicating with each other. The circumferential surface inside the bottom cylinder body 91 has a locking groove 94, and the inner wall of the locking groove 94 has a locking toothed surface 95. like Figure 14As shown, the placement cylinder 10 includes a placement cylinder body 101 disposed inside the bottom cylinder body 91. Two side openings 102 are provided on the circumferential surface of the placement cylinder body 101, and the two side openings 102 correspond to the two side openings 93. A connecting hole 103 is provided on the bottom wall inside the placement cylinder body 101, located directly above the bottom hole 92. Two elastic members 104 are provided on the outer surface of the placement cylinder body 101, with one end penetrating and extending to the outside of the side opening 93. A toothed locking block 106 is provided on the side of the two elastic members 104 facing the locking groove 94, which is in close contact with the locking toothed surface 95. A toggle block 105 is provided on the end of the elastic member 104 that penetrates the side opening 93. Based on the above, the bottom cylinder 9 restricts the placement cylinder 10, allowing the placement cylinder 10 to move vertically along the bottom cylinder 9. The bottom hole 92 allows the telescopic top rod 8 to extend into the interior of the bottom cylinder body 91 from the bottom hole 92. The side opening 93 allows the side rod 112, the elastic element 104, and the actuating block 105 to extend out of the bottom cylinder body 91. The locking groove 94 and the locking toothed surface 95 cooperate with the elastic element 104 and the toothed locking block 106 respectively, so that the placement cylinder 10 can be fixed inside the bottom cylinder 9. After squeezing the actuating block 105, the elastic element 104 undergoes elastic deformation, and the toothed block 106 separates from the toothed surface 95. At this time, the placement cylinder 10 can be moved, allowing the placement cylinder 10 to move vertically, thereby achieving the effect of adjusting the height of the placement cylinder 10. This also allows the headspace vials placed inside the placement cylinder 10 to be adjusted in height, thus distinguishing headspace vials storing different samples. like Figure 15 As shown, a movable frame 11 is provided inside the placement cylinder 101. The movable frame 11 includes a hollow ring 111 located inside the placement cylinder 101. A side rod 112 is provided on the circumferential surface of the hollow ring 111, which passes through the side opening 102 and the side opening 93 in sequence. A roller 113 is provided at one end of the side rod 112 away from the hollow ring 111. Based on the above, the side rod 112 and roller 113 are arranged so that when the moving frame 11 moves in a circular motion following the layered placement seat, the rollers 113 on both sides contact the inclined sides of the first isosceles trapezoidal block 292 and the second isosceles trapezoidal block 44 respectively. Since the contact surface is inclined, there is a vertical component of the interaction force between the roller and the isosceles trapezoidal block. This causes the moving frame 11 to lift the headspace bottle placed on its upper surface upward together. When it is lifted to the top of the two isosceles trapezoidal blocks, the moving frame 11 is exactly below the sampling needle and above the lifting hole 23. When the aforementioned movable frame 11 moves to the top of the isosceles trapezoidal block, the two rollers 113 are respectively restricted by the annular limiting strip 43 and the stop block 291, so that when the telescopic top rod 8 pushes the empty bottle upward, the movable frame 11 is prevented from shifting upward under the action of friction.

[0026] In summary, this rotary headspace sampling device is used in conjunction with an analyzer. During use, the headspace vial is placed inside the placement cylinder 10, at which point the headspace vial contacts the upper surface of the moving frame 11. The motor 6 drives the drive gear 7, which in turn drives the rotary disk 5 to rotate. This causes the bottom cylinder 9, placement cylinder 10, and moving frame 11 located on the upper surface of the rotary disk 5 to move in a circular motion. During the circular motion, the photoelectric switch 3, positioning hole 22, and light signal through hole 53 cooperate with each other (the circuit control required for the above cooperation is a very simple circuit, and traditional rotary disks also require this circuit control during use, i.e., existing technology, so its specific details are not elaborated here). This ensures that the rotation angle of the rotary disk 5 remains relatively constant, i.e., after the placement cylinder 10 located directly below the sampling needle moves, the next placement cylinder 10 drives the headspace vial to move directly below the sampling needle. During the above process, hot air is always introduced into the hot air inlet pipe 12. The hot air enters the interior of the mounting frame 25 through the air inlet 24, and flows through the bottom hole 92, the connecting hole 103 and the hollow ring 111 before contacting the headspace bottle and heating the headspace bottle. During the circular motion of the moving frame 11, the rollers 113 on both sides contact the inclined sides of the first isosceles trapezoidal block 292 and the second isosceles trapezoidal block 44, respectively. Since the contact surface is inclined, there is a vertical component of the interaction force between the rollers and the isosceles trapezoidal blocks. This causes the moving frame 11 to lift the headspace bottle placed on its upper surface upward together. When it is lifted to the top of the two isosceles trapezoidal blocks, the moving frame 11 is directly below the sampling needle and directly above the lifting hole 23. When the moving frame 11 moves to the top of the isosceles trapezoidal blocks, the telescopic rod 8 works to lift the headspace bottle upward, so that the sampling needle penetrates the bottle cap and extends into the interior of the headspace bottle. During this process, the two rollers 113 are restricted by the annular limiting strip 43 and the stop block 291, respectively, to prevent the moving frame 11 from shifting upward under the action of friction. When headspace sampling is required for different samples, headspace vials containing different samples are placed inside the placement cylinder 10. By squeezing and actuating the actuating blocks 105, the two actuating blocks 105 move towards each other, thereby causing the toothed locking block 106 to separate from the locking toothed surface 95. At this time, the position of the placement cylinder 10 can be vertically adjusted, that is, the height of the placement cylinder 10 can be changed, so that the headspace vials of the batch are layered according to height. The headspace vials inside the placement cylinder 10 at the same height contain the same sample. The headspace vials are distinguished by layering instead of sticking labels, which not only makes it easier for users to distinguish them, but also makes the headspace vials easy to reuse.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-layer rotary headspace sampling device, characterized in that, include: The main body of the sampling machine (1) and the multi-layer turntable mechanism; The multi-layer turntable mechanism includes a fixed base (2) disposed outside the sampler body (1), the fixed base (2) being disposed below the sampling needle of the sampler body (1), and a rotating disk (5) disposed inside the fixed base (2). The rotating disk (5) is driven by a motor (6) and a drive gear (7). Multiple layered placement seats are disposed on the upper surface of the rotating disk (5), and the multiple layered placement seats are distributed in a ring at equal intervals. The layered placement seat includes a bottom cylinder (9), and the bottom cylinder (9) has a placement cylinder (10) that can move vertically inside.

2. The multi-layer rotary headspace sampling device according to claim 1, characterized in that, The fixed base (2) includes an upward-facing cup-shaped base (21). The lower surface inside the cup-shaped base (21) is provided with a positioning hole (22), a lifting hole (23), an air inlet (24), and a mounting frame (25). The mounting frame (25) is fitted over the outside of the air inlet (24). The lower surface of the cup-shaped base (21) is provided with a hot air inlet pipe (12) that communicates with the air inlet (24). The other end of the hot air inlet pipe (12) is connected to a hot air blower. A fixed cylinder (4) is provided at the center of the bottom wall inside the cup-shaped base (21).

3. The multi-layer rotary headspace sampling device according to claim 2, characterized in that, The cup-shaped base (21) has an annular cover (26) on its top. An annular groove (27) is provided on the side of the annular cover (26) opposite to the cup-shaped base (21). A support frame (28) and a stand (29) are provided on the top of the annular cover (26). The side of the support frame (28) facing the cup-shaped base (21) has a transmitting end of a photoelectric switch (3). The bottom of the cup-shaped base (21) has a receiving end of the photoelectric switch (3). The receiving end is used to receive the transmitted signal. The light signal emitted from the end, the upright block (29) facing the fixed cylinder (4) is provided with a stop block (291) and a first isosceles trapezoidal block (292) from top to bottom, and a gap is provided between the stop block (291) and the first isosceles trapezoidal block (292). The lower surface of the cup-shaped base (21) is provided with a telescopic top rod (8) located below the lifting hole (23). The telescopic top rod (8) is used to lift the headspace bottle that has moved to the point directly below the sampling needle and is located inside the placement cylinder (10).

4. The multi-layer rotary headspace sampling device according to claim 3, characterized in that, The fixed cylinder (4) includes a hollow cylinder (41), and a fixed post (42) is provided at the bottom of the hollow cylinder (41). The fixed post (42) is connected to the center of the inner bottom wall of the cup-shaped base (21). An annular limiting strip (43) with an outer diameter larger than the outer diameter of the hollow cylinder (41) is provided at the top of the hollow cylinder (41). A second isosceles trapezoidal block (44) is provided on the side of the annular limiting strip (43) facing the first isosceles trapezoidal block (292). The first isosceles trapezoidal block (292) and the second isosceles trapezoidal block (44) are on the same radial extension line of the annular cover (26).

5. The multi-layer rotary headspace sampling device according to claim 3, characterized in that, The rotating disk (5) includes a disk body (51) disposed inside the cup-shaped base (21). The upper surface of the disk body (51) is provided with a central hole (57). The fixed cylinder (4) is disposed inside the central hole (57) and extends through the central hole (57) to the top of the central hole (57). A plurality of hemispherical blind holes (55) are provided on the circumferential surface of the disk body (51). The interior of the hemispherical blind holes (55) is provided with ball bearings (56) that extend into the annular groove (27) and contact the inner wall of the annular groove (27).

6. The multi-layer rotary headspace sampling device according to claim 5, characterized in that, The upper surface of the disk body (51) is provided with a plurality of push rod holes (52) and a plurality of optical signal through holes (53). The plurality of push rod holes (52) and optical signal through holes (53) are all distributed in a ring at equal intervals and are arranged in an alternating pattern. The inner circumferential surface of the disk body (51) is provided with a ring toothed surface (54). The inner surface of the disk body (51) is provided with an active gear (7) that meshes with the ring toothed surface (54). The lower surface of the cup-shaped base (21) is provided with a motor (6) whose output shaft extends into the inner surface of the disk body (51) and is connected to the active gear (7). The positioning hole (22) is located directly below the movement path of the push rod hole (52).

7. The multi-layer rotary headspace sampling device according to claim 6, characterized in that, The bottom cylinder (9) includes a bottom cylinder body (91) disposed on the upper surface of the disc body (51). The bottom cylinder body (91) has two symmetrically distributed side openings (93) on its circumferential surface. The bottom wall inside the bottom cylinder body (91) is provided with a bottom hole (92). The bottom hole (92) is located directly above the top rod hole (52) and is interconnected. The circumferential surface inside the bottom cylinder body (91) is provided with a locking groove (94). The inner wall of the locking groove (94) is provided with a locking tooth surface (95).

8. The multi-layer rotary headspace sampling device according to claim 7, characterized in that, The placement cylinder (10) includes a placement cylinder body (101) disposed inside the bottom cylinder body (91). Two side openings (102) are provided on the circumferential surface of the placement cylinder body (101). The two side openings (102) correspond to the two side openings (93). A connecting hole (103) is provided on the bottom wall inside the placement cylinder body (101) and located directly above the bottom hole (92). Two elastic members (104) are provided on the outer surface of the placement cylinder body (101) with one end penetrating and extending to the outside of the side opening (93). A toothed block (106) is provided on the side of the two elastic members (104) facing the locking groove (94) and closely fits the locking toothed surface (95). A toggle block (105) is provided on the end of the elastic member (104) penetrating the side opening (93).

9. The multi-layer rotary headspace sampling device according to claim 8, characterized in that, The placement cylinder body (101) is provided with a movable frame (11). The movable frame (11) includes a hollow ring (111) located inside the placement cylinder body (101). A side rod (112) is provided on the circumference of the hollow ring (111) through the side opening (102) and the side opening (93) in sequence. A roller (113) is provided at the end of the side rod (112) away from the hollow ring (111).

10. A gas detection system, characterized in that, include: Analyzer (13); The analyzer (13) and the sampling needle of the sampler body (1) are connected to each other through a pipe.

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