Sample transfer device for automatic headspace sampler

Abstract

The utility model discloses a sample transfer device for an automatic headspace sampler, which comprises a base, a vertical plate vertically mounted in the middle area of the base, a sampling mechanism fixedly arranged on the vertical plate, and a sample feeding mechanism embedded in a groove of the base and positioned below the vertical plate, the control system is used for controlling the sampling mechanism and the sample feeding mechanism to move; a sample supply frame is movably arranged on a sample feeding mechanism, and headspace bottles are arranged on the sample supply frame in order; a movable sampling needle is arranged on the sampling mechanism; the position matching of the sampling mechanism and the sample feeding mechanism is adjusted through the control system, so that the sampling needle is inserted into the headspace bottle to realize headspace sample injection analysis. The sample transferring device of the headspace sample injector is compact in overall structural arrangement, space of an instrument is saved, meanwhile, sample transferring and accurate positioning of headspace sample injection are facilitated, temperature control and pressure adjustment of a headspace bottle are achieved, and consistency of the temperature of an airtight sample injection needle is guaranteed in the sampling and sample injection process in actual detection work.

Description

Technical Field

[0001] The utility model belongs to a volatile substance headspace sampling technology in the technical field of environmental organic pollutant detection, and more specifically relates to a sample transfer device for an automatic headspace sampler. Background Art

[0002] The headspace sampler is a convenient and fast sample pretreatment method in gas chromatography. The sample to be tested is placed in a closed container, and the volatile components are evaporated from the sample matrix by heating. Equilibrium is reached in the gas-liquid or gas-solid phases, and the top gas is directly extracted for chromatographic analysis, thereby verifying the composition and content of the volatile components in the sample.

[0003] The headspace method is an indirect analysis method that uses the gas composition above the sample matrix to determine the content of these components in the original sample. The basic theoretical basis of this method is that under certain conditions, there is a distribution equilibrium between the gas phase and the condensed phase (such as the liquid phase or solid phase), and the composition of the gas phase can reflect the composition of the condensed phase; headspace analysis is regarded as a gas phase extraction method, that is, using gas as a "solvent" to extract the volatile components in the sample. Therefore, headspace analysis is an ideal sample purification method. Headspace analysis specifically collects volatile components in the sample. Compared with liquid-liquid extraction and solid phase extraction methods, it can avoid the loss of volatile substances when removing the solvent and reduce the instrument noise interference caused by the co-extracts. This makes the headspace analysis method have higher sensitivity and faster analysis speed for the analysis of trace volatile organic substances in the sample compared to the solvent extraction method.

[0004] At present, most of the sample supply trays of headspace samplers use round turntables, and the transfer module uses pneumatic grippers to grab samples. Most of the existing instruments use round sample supply trays. The sample storage capacity of round sample supply trays is limited, and the space utilization rate of sample supply trays is low. In actual work, it is difficult to ensure the consistency of the temperature of the airtight injection needle during sampling and injection. The setting method of the sample transfer device for headspace injection is prone to different disadvantages: First, pressure control is difficult to achieve. Under heating conditions, the pressure of the headspace air is too high, which will cause the loss of volatile components at the moment when the airtight injection needle is pulled out of the headspace bottle. Therefore, there are deficiencies in quantitative analysis. Second, temperature control. When the temperature of the airtight injection needle is low, some sample components with higher boiling points are easy to condense, resulting in sample loss. Utility Model Content

[0005] In view of at least one shortcoming in the prior art, the utility model provides a sample transfer device for an automatic head space sampler, comprising a sampling mechanism, a sample delivery mechanism and a sampling head that move independently of each other, and adjusts them through a control system to reach a head space bottle that needs to be sampled to achieve sampling, and pierces the head space bottle to perform head space analysis, which has the advantages of rapid sampling, multi-sample analysis and good detection consistency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A sample transfer device for an automatic head space sampler includes a base and a vertical plate vertically mounted on the middle area of ​​the base, a sampling mechanism fixedly arranged on the vertical plate, a sample delivery mechanism embedded in a groove of the base and located below the vertical plate, and a control system for controlling the movement of the sampling mechanism and the sample delivery mechanism; a sample supply rack is movably arranged on the sample delivery mechanism, and head space bottles are neatly arranged on the sample supply rack; a movable sampling needle is arranged on the sampling mechanism; the position matching of the sampling mechanism and the sample delivery mechanism is adjusted by the control system so that the sampling needle is inserted into the head space bottle to realize head space sampling analysis. Through such a structural setting method, the overall structure of the head space sampler is compactly arranged, and the precise positioning of the sample transfer of the head space sampler is convenient while saving the instrument space, as well as the temperature control and pressure adjustment of the head space bottle, so as to ensure the consistency of the temperature of the airtight sample needle during the sampling and injection process in the actual detection work.

[0008] Furthermore, the groove is covered with two temperature control covers that cooperate with each other, and the two temperature control covers cooperate to form a sampling groove, and the sampling needle performs head space sampling and analysis on the head space bottle through the sampling groove. Through such a structural setting, the sample delivery mechanism only needs to move in one direction, the sampling mechanism only needs to move in another direction, and the sampling needle only needs to move in one direction to perform head space sampling and analysis on all the head space bottles neatly arranged on the sample supply rack.

[0009] Furthermore, the sample delivery mechanism is covered by the temperature control cover in the groove on the base, and the headspace bottle can be taken out or replaced by opening the temperature control cover on one end of the sample supply rack. The temperature control cover matched with the groove is provided to realize the temperature regulation and control of the sample delivery mechanism, the sample supply rack and the headspace bottle.

[0010] Furthermore, the sample feeding mechanism includes a bracket and a third motor and a transmission belt arranged in the middle area of ​​one end of the bracket, and the third motor drives the transmission belt to operate through a driving wheel; and the third motor, driving wheel and transmission belt are located in the middle area of ​​the bracket.

[0011] Furthermore, the sample supply rack includes a bracket mounted on two slide bars on both sides of the bracket, and a mesh plate fixed by pillars, the head space bottles are neatly arranged on the mesh plate, and the sample supply rack can only move along the fixed slide bars.

[0012] Furthermore, the sample supply rack is clamped and fixed on the transmission belt by a chain block, and the transmission belt drives the sample supply rack to move along the slide bar when rotating, and the control system controls the start and stop of the third motor to adjust the position of the sample supply rack. By sleeve-arranging the sample supply rack on two slide bars and using the motor and transmission belt arranged in the middle to adjust the position of the headspace bottle, the position is easy to adjust and the accuracy is easy to control, and the sample in the headspace bottle that needs to be analyzed and tested can be quickly located.

[0013] Furthermore, the sampling mechanism includes a suspension fixedly arranged on one side of the vertical plate, a sampling head arranged on the suspension, and a first motor and a second motor fixedly arranged on the other side of the vertical plate, and the first motor and the second motor are located at one end of the suspension.

[0014] Furthermore, the suspension is provided with a square shaft and a screw rod which are parallel to each other and can rotate independently, the first motor drives the square shaft to rotate through a first conveyor belt, and the second motor drives the screw rod to rotate through a second conveyor belt.

[0015] Furthermore, the sampling head is suspended on the square shaft and the screw via a slide plate, and when the screw rotates, the sampling head moves on the suspension along the axial direction of the square shaft and the screw; the control system independently controls the start and stop of the first motor and the second motor to adjust the position of the sampling head.

[0016] Furthermore, the sampling head includes a needle seat, a guard strip fixedly mounted on the needle seat, and a rack in rolling contact with a gear slidably arranged on the square shaft.

[0017] Furthermore, one end of the rack is fixedly arranged on the needle seat; the needle seat is slidably arranged on the slide; the sampling needle is installed and fixed on the needle seat and the needle head of the sampling needle passes through the guard strip; the control system controls the second motor to drive the screw to rotate to move the sampling head to the corresponding position of the head space bottle that needs to be sampled, and then the control system controls the first motor to drive the square shaft to rotate, and the square shaft drives the gear to rotate and drives the rack to move vertically up and down to move the sampling needle 7 up and down to pierce the head space bottle, thereby detecting and analyzing the sample, which has the advantages of fast and accurate.

[0018] The utility model also provides an automatic head space sampler, comprising the sample transfer device.

[0019] Furthermore, the automatic head space sampler is also provided with a cleaning chamber, into which the needle head of the sampling needle can be inserted. The needle head can be quickly cleaned by providing the cleaning chamber, thereby avoiding contamination of samples in each other's head space bottles and affecting the analysis accuracy.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The overall structure of the sample transfer device of the utility model is compact, which saves instrument space and facilitates the precise positioning of the sample transfer for headspace injection, as well as the temperature control and pressure adjustment of the headspace bottle, so as to ensure the consistency of the temperature of the airtight injection needle during the sampling and injection process in actual detection work.

[0022] 2. The sample transfer device for the automatic head space sampler of the utility model comprises a sampling mechanism, a sample delivery mechanism and a sampling head which move independently of each other, and adjusts them to reach the head space bottle to be sampled through a control system to realize sampling, and performs head space analysis on the head space bottle by piercing the sample, which has the advantages of fast sampling, multi-sample analysis and good detection consistency.

[0023] 3. The sample transfer device of the utility model realizes temperature regulation and control of the sample delivery mechanism, the sample supply rack and the head space bottle by setting a temperature control cover matched with the groove, that is, a heat transfer medium such as water, oil or other media is added to the groove, and the temperature of the head space sample is controlled by heating the heat transfer medium, and the temperature control cover can fully keep warm and isolate the heat from being transferred to other areas of the head space sampler detection instrument, thereby affecting the performance of the head space sampler.

[0024] 4. The automatic head space sampler of the utility model sets the sample supply rack on two slide bars, and uses the motor and transmission belt arranged in the middle to adjust the position of the head space bottle. Since the sample supply rack can only move along the fixed slide bars, its position is easy to adjust and the accuracy is easy to control, and the sample in the head space bottle that needs to be analyzed and tested can be quickly located. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional layout diagram of the sample transfer device for the automatic head space sampler of the utility model;

[0026] Figure 2 It is a three-dimensional assembly diagram of the sample transfer device for the automatic head space sampler of the utility model;

[0027] Figure 3 It is an assembly diagram of the sample supply rack and sample delivery mechanism of the sample transfer device of the utility model;

[0028] Figure 4 It is a layout diagram of the sampling mechanism of the sample transfer device for the automatic head space sampler of the utility model;

[0029] Markings in the figure: 1-base, 10-control system, 11-groove; 2-vertical plate;

[0030] 3-sampling mechanism, 30-suspension, 31-first motor, 32-second motor, 33-square shaft, 34-screw rod; 35-sampling head, 351-needle seat, 352-guard strip, 353-rack; 36-first conveyor belt, 37-slide plate;

[0031] 4-sample rack, 41-net plate, 42-pillar, 43-bracket;

[0032] 5-sample delivery mechanism, 50-bracket, 51-third motor, 52-driving wheel, 53-sliding rod, 54-transmission belt, 55-chain block;

[0033] 6-cleaning chamber, 7-sampling needle, 8-temperature control cover, 81-sampling slot, 9-head space bottle. DETAILED DESCRIPTION

[0034] The following is a further non-restrictive detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. In the description of the utility model, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "middle", "inner", "axial", "vertical", "vertical", "horizontal", "one end", "the other end", "one side", "the other side" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limitations on the utility model.

[0035] Reference Figure 1 and 2 As shown, the utility model discloses a sample transfer device for an automatic head space sampler, a sample transfer device for an automatic head space sampler, comprising a base 1 and a vertical plate 2 vertically installed on the middle area of ​​the base 1, a sampling mechanism 3 fixedly arranged on the vertical plate 2, a sample delivery mechanism 5 embedded in a groove 11 of the base 1 and located below the vertical plate 2, and a control system 10 for controlling the movement of the sampling mechanism 3 and the sample delivery mechanism 5; a sample supply rack 4 is movably arranged on the sample delivery mechanism 5, and head space bottles 9 are neatly arranged on the sample supply rack 4; a movable sampling needle 7 is arranged on the sampling mechanism 3; the sampling needle 7 is inserted into the head space bottle 9 to realize head space sampling analysis by adjusting the position matching of the sampling mechanism 3 and the sample delivery mechanism 5 through the control system 10.

[0036] The groove 11 is covered with two mutually cooperating temperature control covers 8, which are respectively located on both sides of the vertical plate 2. The two temperature control covers 8 cooperate with each other to form a protective cover covering the groove 11, and the two temperature control covers 8 cooperate to form a strip sampling groove 81, and the sampling needle 7 performs headspace sampling and analysis on the headspace bottle 9 through the sampling groove 81. Through such a structural setting, the sample delivery mechanism only needs to move in one direction (i.e., move in the horizontal X direction), the sampling mechanism only needs to move in another direction (i.e., move in the longitudinal Y direction), and the sampling needle only needs to move in one direction (i.e., move in the vertical Z direction) to perform headspace sampling and analysis on all the headspace bottles neatly arranged on the sample supply rack. Thereby reducing the control complexity, improving the control accuracy, and easily realizing automatic control. Through such a structural setting, the overall structure of the headspace sampler is compactly arranged, and while saving the instrument space, it is convenient to accurately position the sample transfer of the headspace injection, as well as the temperature control and pressure adjustment of the headspace bottle, so as to ensure the consistency of the temperature of the airtight injection needle during the sampling and injection process in the actual detection work.

[0037] Reference Figure 2 and 3 As shown, as a further improved implementation of the sample transfer device for the automatic head space sampler: the sample delivery mechanism 5 includes a bracket 50, a transmission belt 54, a third motor 51 arranged in the middle area of ​​one end of the bracket 50, and a driven wheel arranged in the middle area of ​​the other end of the bracket 50 relative to the third motor, a driving wheel 52 is installed on the third motor 51, and the transmission belt 54 is wound around the driving wheel 52 and the driven wheel, and the third motor 51 drives the transmission belt 54 to operate through the driving wheel 52; and the third motor 51, the driving wheel 52 and the transmission belt 54 are located in the middle area of ​​the bracket 50.

[0038] The sample delivery mechanism 5 is covered by a temperature control cover 8 in the groove on the base 1. The temperature control cover 8 at one end of the sample supply rack 4 can be opened to take out or replace the head space bottle 9. The temperature control cover matched with the groove is provided to realize the temperature adjustment and control of the sample delivery mechanism, the sample supply rack and the head space bottle, that is, a heat transfer medium such as water, oil or other medium is added to the groove, and the temperature of the head space sample is controlled by heating the heat transfer medium, and the temperature control cover can fully keep the temperature and isolate the heat from being transferred to other areas of the head space sampler detection instrument to affect the performance of the head space sampler.

[0039] A chain block 55 is installed on the transmission belt 54; a pair of slide bars 53 are installed on both sides of the bracket 50, and the slide bars are perpendicular to the length direction of the sampling slot 81 in the horizontal direction; a bracket 43 is fixed below the sample rack 4, and the bracket 43 is slidably mounted on the slide bar 53; a mesh plate 41 is installed on the sample rack 4 through a support 42, and the headspace bottles 9 are neatly arranged on the mesh plate 41; the sample rack 4 is connected to the chain block 55 below, and the transmission belt 54 drives the sample rack 4 to move along the slide bar 53 when it is running, and the control system 10 controls the start and stop of the third motor 51 to adjust the position of the sample rack 4. By mounting the sample rack on two slide bars, and using the motor and transmission belt arranged in the middle to adjust the position of the headspace bottle, since the sample rack can only move along the fixed slide bars, its position is easy to adjust and its accuracy is easy to control, and the sample in the headspace bottle that needs to be analyzed and tested can be quickly located.

[0040] Reference Figure 4 As shown, as another embodiment of the sample transfer device for the automatic head space sampler, the sampling mechanism 3 includes a sampling head 35, a slide plate 37, a suspension 30 fixedly arranged on one side of the vertical plate 2, and a first motor 31 and a second motor 32 fixedly arranged on the other side of the vertical plate 2, and the first motor 31 and the second motor 32 are located at one end of the suspension 30. A square shaft 33 and a screw rod 34 that are parallel to each other and can rotate independently are installed on the suspension 30, the first motor 31 drives the square shaft 33 to rotate through the first conveyor belt 36, and the second motor 32 drives the screw rod 34 to rotate through the second conveyor belt.

[0041] The axes of the square shaft 33 and the screw rod 34 are perpendicular to the axis of the slide rod 53 in the horizontal direction. The slide plate 37 is vertically arranged. One side of the slide plate 37 is sleeved on the square shaft 33 and the screw rod 34. The slide plate 37 can be slidably connected with the square shaft 33 through a square hole sleeve. The screw rod 34 is provided with a screw nut, and the slide plate 37 is connected with the screw nut. The sampling head 35 is slidably arranged on the slide plate 37. When the screw rod 34 rotates, the slide plate 37 drives the sampling head 35 to move along the axial direction of the screw rod 34 on the suspension 30. The control system 10 independently controls the start and stop of the first motor 31 and the second motor 32 to adjust the position of the sampling head 35. The sampling head 35 includes a needle seat 351, a guard strip 352 fixedly mounted on the needle seat 351, and a rack 353 meshed with a gear slidably arranged on the square shaft 33. One end of the rack 353 is fixed on the needle seat 351; the needle seat 351 is slidably arranged on the slide 37 along the vertical direction; the sampling needle 7 is installed and fixed on the needle seat 351 and the needle head of the sampling needle 7 passes through the guard strip 352; the control system 10 controls the second motor 32 to drive the screw 34 to rotate to realize the sampling head 35 to move to the corresponding position of the headspace bottle 9 to be sampled, and then the control system 10 controls the first motor 31 to drive the square shaft 33 to rotate, and the square shaft 33 drives the gear to rotate and drives the rack 353 to move vertically up and down to realize the up and down movement of the sampling needle 7 so as to pierce the headspace bottle 9, thereby detecting and analyzing the sample, which has the advantages of fast and accurate. It should be noted that, as an embodiment, in order to enable the gear to keep meshing with the rack when the slide moves along the axial direction of the screw 34, a limit block can be connected to the position of the corresponding gear on the slide, and the limit block is blocked at both ends of the gear. When the slide moves, the limit block makes the gear follow the slide to move along the axial direction of the screw 34.

[0042] At the same time, the utility model also provides an automatic head space sampler, including the sample transfer device mentioned above; the automatic head space sampler is also provided with a cleaning chamber 6, and the needle head of the sampling needle 7 can be inserted into the cleaning chamber 6. By setting the cleaning chamber, the needle head can be quickly cleaned to avoid contamination of samples in each other's head space bottles and affect the analysis accuracy. The sample transfer device of the utility model realizes temperature regulation and control of the sample delivery mechanism, the sample supply rack and the head space bottle by setting a temperature control cover matched with the groove, that is, a heat transfer medium such as water, oil or other medium is added to the groove; it should be noted that in actual application, a heating device and a temperature sensor can be set in the groove, and the heating device includes but is not limited to a heating wire, and the temperature control of the heat transfer medium is realized by the heating device and the temperature sensor, and the temperature control of the head space sample is realized by heating the heat transfer medium, and the temperature control cover can fully keep warm and isolate the heat from being transferred to other areas of the head space sampler detection instrument, affecting the performance of the head space sampler.

[0043] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A sample transfer device for an automatic head space sampler, characterized in that: It comprises a base (1), a vertical plate (2), a sampling mechanism (3), a sample delivery mechanism (5) and a control system (10); The upper surface of the base (1) is provided with a groove (11); the vertical plate (2) is vertically mounted in the middle area of ​​the base (1), and the vertical plate (2) is mounted above the groove (11); the sample delivery mechanism (5) is embedded in the groove (11) and is located below the vertical plate (2); the sampling mechanism (3) is mounted on the vertical plate (2) and is arranged corresponding to the sample delivery mechanism (5); the control system (10) is electrically connected to the sampling mechanism (3) and the sample delivery mechanism (5) respectively; A sample supply rack (4) is movably arranged on the sample delivery mechanism (5), and a head space bottle (9) is placed on the sample supply rack (4); a sampling needle (7) is arranged on the sampling mechanism (3); and the control system (10) is used to control the sampling mechanism (3) and the sample delivery mechanism (5), thereby causing the sampling needle (7) to be inserted into the head space bottle (9).

2. The sample transfer device for an automatic head space sampler according to claim 1, characterized in that: A pair of temperature control covers (8) are detachably mounted on the base (1), the two temperature control covers (8) being located on both sides of the vertical plate (2) respectively, and the two temperature control covers (8) cooperate with each other to form a protective shield covering the groove (11); A sampling groove (81) is provided at the joint of the two temperature control covers (8), and the sampling needle (7) is arranged corresponding to the sampling groove (81). The sampling needle (7) is used to pass through the sampling groove (81) and be inserted into the head space bottle (9).

3. The sample transfer device for an automatic head space sampler according to claim 2, characterized in that: The sample delivery mechanism (5) is covered by the temperature control cover (8) in the groove (11), and the temperature control cover (8) on one side of the sample supply rack (4) is opened to take out and place the head space bottle (9).

4. The sample transfer device for an automatic head space sampler according to claim 3, characterized in that: The sample feeding mechanism (5) comprises a bracket (50), a transmission belt (54), and a third motor (51) arranged in a middle region of one end of the bracket (50); a driving wheel (52) is mounted on the third motor (51), a driven wheel is mounted in a middle region of the other end of the bracket (50) at a position corresponding to the driving wheel (52), and the transmission belt (54) is sleeved on the driving wheel (52) and the driven wheel; The third motor (51) drives the transmission belt (54) to operate via a driving wheel (52); a chain block (55) is installed on the transmission belt (54); and a pair of sliding rods (53) are installed on both sides of the bracket (50).

5. The sample transfer device for an automatic head space sampler according to claim 4, characterized in that: A bracket (43) is fixed below the sample supply rack (4), and the bracket (43) is slidably mounted on the slide rod (53); a mesh plate (41) is mounted on the sample supply rack (4) via a support (42), and the head space bottles (9) are neatly arranged on the mesh plate (41); The sample supply rack (4) is engaged with the chain block (55) at its lower side, and the transmission belt (54) drives the sample supply rack (4) to move along the slide bar (53) when the transmission belt (54) is in operation.

6. The sample transfer device for an automatic head space sampler according to claim 5, characterized in that: The sampling mechanism (3) comprises a sampling head (35), a slide plate (37), a suspension (30) fixed to one side of the vertical plate (2), and a first motor (31) and a second motor (32) fixed to the other side of the vertical plate (2), wherein the first motor (31) and the second motor (32) are arranged near one end of the suspension (30); A square shaft (33) and a screw rod (34) parallel to each other are rotatably mounted on the suspension (30); the first motor (31) drives the square shaft (33) to rotate via a first conveyor belt (36); and the second motor (32) drives the screw rod (34) to rotate via a second conveyor belt; One side of the slide plate (37) is sleeved on the square shaft (33) and the screw rod (34); the slide plate (37) is slidably connected to the square shaft (33); a screw rod nut is provided on the screw rod (34); the slide plate (37) is connected to the screw rod nut; the sampling head (35) is slidably arranged on the slide plate (37); when the screw rod (34) rotates, the slide plate (37) drives the sampling head (35) to move on the suspension (30) along the axial direction of the screw rod (34).

7. The sample transfer device for an automatic head space sampler according to claim 6, characterized in that: The sampling head (35) comprises a needle seat (351) and a rack (353); the needle seat (351) is slidably arranged on the slide plate (37) in a vertical direction; A gear is slidably disposed on the square shaft (33), the rack (353) is vertically disposed, one end of the rack (353) is fixed on the needle seat (351), and the rack (353) is meshed with the gear; When the square shaft (33) rotates, it drives the gear to rotate, thereby driving the rack to move up and down.

8. The sample transfer device for an automatic head space sampler according to claim 7, characterized in that: A protective strip (352) is fixed on the needle seat (351), and the sampling needle (7) is mounted on the needle seat (351) and the needle head of the sampling needle (7) passes through the protective strip (352).

9. An automatic head space sampler, characterized in that: A sample transfer device comprising the sample transfer device according to any one of claims 1 to 8.

10. The automatic head space sampler according to claim 9, characterized in that: It also comprises a cleaning chamber (6), wherein the cleaning chamber (6) is arranged below the sampling needle (7).

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