Automatic sample injector and chromatographic analysis equipment

Abstract

The utility model provides an automatic sample injector and chromatographic analysis equipment, the automatic sample injector comprises a needle washing assembly, the needle washing assembly comprises a needle washing groove and a liquid discharge groove, the needle washing groove is communicated with the liquid discharge groove, and the needle washing groove is configured to be used for accommodating at least a part of structure of a sample injection needle; the cleaning assembly comprises a cleaning structure and a first draw-off pump, the cleaning structure is connected with the first draw-off pump, the cleaning structure is configured to be used for containing cleaning liquid, and the first draw-off pump is communicated with the needle cleaning groove and is used for extracting the cleaning liquid and cleaning the outer wall of the sample injection needle; and the extraction assembly is connected with the sample injection needle and is used for extracting the sample in the sample injection needle or extracting the cleaning liquid and cleaning the inner wall of the sample injection needle. In the whole process, the sample injection needle can be effectively, reliably and completely cleaned, and preposition action preparation is made for next sample injection.

Description

Technical Field

[0001] The present application relates to the technical field of chromatography detection, and in particular to an automatic sample injector and chromatography analysis equipment. Background Art

[0002] The automatic sampler is an important instrument in chemical analysis experiments. It can avoid the problems of inaccurate quantitative analysis, errors caused by long-term repetitive work, and low work efficiency caused by manual sampling.

[0003] The injection needle will be injected after cleaning, so the injection needle needs to be cleaned every time it comes into contact with the sample to prepare for the next injection. Therefore, how to improve the cleaning function of the automatic sampler is particularly important. Utility Model Content

[0004] The purpose of this application is to provide an automatic sample injector and a chromatographic analysis device that can effectively and reliably clean the injection needle.

[0005] In the first aspect, an embodiment of the present application provides an automatic sampler, comprising: a needle washing assembly, comprising a needle washing trough and a drainage trough, the needle washing trough being connected to the drainage trough, and the needle washing trough being configured to accommodate at least part of the structure of the injection needle; a cleaning assembly, comprising a cleaning structure and a first extraction pump, the cleaning structure being connected to the first extraction pump, the cleaning structure being configured to accommodate a cleaning liquid, the first extraction pump being connected to the needle washing trough, for extracting the cleaning liquid and cleaning the outer wall of the injection needle; an extraction assembly, which is connected to the injection needle, for extracting the sample in the injection needle, or extracting the cleaning liquid for cleaning the inner wall of the injection needle.

[0006] In the above implementation process, when the automatic sampler is running in the injection state, the extraction component works, the sample enters the extraction component after passing through the injection needle, and is switched by the extraction component to enter the analysis state, and then the injection needle is placed in the needle washing tank, and the first extraction pump draws the cleaning liquid in the cleaning structure into the needle washing tank, and finally flows to the drain tank, thereby completing the cleaning of the outer wall of the injection needle. When the extraction component is extracting, the cleaning liquid in the needle washing tank can be drawn into the inner wall of the injection needle, and the cleaning of the inner wall of the injection needle is completed. The whole process can effectively and reliably clean the injection needle completely, and prepare for the pre-action for the next injection.

[0007] In some embodiments, the cleaning structure includes a cleaning bottle, a cleaning pipeline and a first sensor. The cleaning pipeline connects the cleaning bottle and the first extraction pump. The first sensor is connected to the cleaning bottle for detecting the cleaning liquid in the cleaning bottle.

[0008] In the above implementation process, the cleaning pipeline is respectively connected to the cleaning bottle and the first extraction pump. When the automatic sampler enters the analysis state, the cleaning liquid in the cleaning bottle can be extracted into the needle washing assembly under the action of the first extraction pump, thereby completing the cleaning of the inner and outer walls of the injection needle. At the same time, a first sensor is arranged on the cleaning bottle, which can be used to detect the usage of the cleaning liquid in the cleaning bottle, thereby improving convenience.

[0009] In some embodiments, the cleaning structure further includes a second sensor connected to the cleaning pipeline for detecting the cleaning fluid in the cleaning pipeline.

[0010] In the above implementation process, by setting a second sensor on the cleaning pipeline, it is possible to detect whether the cleaning liquid is drawn into the cleaning pipeline under the action of the second sensor, thereby inferring whether there is still cleaning liquid in the cleaning bottle, thereby improving the intelligence and convenience of the automatic sampler.

[0011] In some embodiments, the cleaning structure further includes a filter element, which is connected to the cleaning pipeline and is used for filtering the cleaning liquid when it enters the cleaning pipeline.

[0012] In the above implementation process, a filter element is set on the cleaning pipeline so that when the first extraction pump extracts the cleaning liquid, the filter element can filter the cleaning liquid, ensuring the cleanliness of the cleaning liquid entering the needle washing assembly, which is beneficial to the cleaning of the injection needle and avoids contamination of the sample.

[0013] In some embodiments, the needle washing tank includes a first tank body and a second tank body, the first tank body is connected to the second tank body, and the cross-sectional size of the first tank body gradually increases along the direction away from the second tank body, and the side of the second tank body away from the first tank body is connected to the first extraction pump.

[0014] In the above implementation process, by setting the needle washing tank as a first tank body and a second tank body, and the size of the first tank body gradually increases in the direction away from the second tank body, it can not only guide the injection needle, but also reduce the amount of cleaning liquid used each time. In the direction away from the second tank body, the flow speed of the cleaning liquid can be increased, thereby improving the cleaning effect on the outer wall of the injection needle.

[0015] In some embodiments, the extraction component includes a second extraction pump and a multi-way valve, the second extraction pump is connected to the multi-way valve, and the multi-way valve is connected to the injection needle.

[0016] In the above implementation process, the second extraction pump is connected to the multi-way valve, so that when the second extraction pump is extracting, it can not only complete the injection state of the automatic sampler, but also when the automatic sampler is switched to the analysis state, the second extraction pump can extract the cleaning liquid to complete the cleaning of the inner wall of the injection needle, thereby avoiding contamination of the sample when switching to the injection state again.

[0017] In some embodiments, the autosampler further includes a collection bucket connected to the extraction assembly and the drain trough. The collection bucket collects waste liquid generated during injection needle cleaning, thereby preventing the waste liquid from contaminating the autosampler or other equipment, thereby improving the cleanliness of the autosampler.

[0018] In some embodiments, a vent is provided on one side of the collection barrel, which facilitates exhaust when the collection barrel collects waste liquid, thereby preventing the collection barrel from being unable to collect waste liquid due to excessive pressure inside the collection barrel.

[0019] In some embodiments, the needle washing assembly further includes a first connector and a second connector, wherein the first connector is respectively connected to the needle washing tank and the first extraction pump, and the second connector is respectively connected to the drainage tank and the collection bucket.

[0020] In a second aspect, the present application also provides a chromatography analysis device, comprising the automatic sample injector as described in any one of the above items.

[0021] Since the chromatographic analysis device provided in the second aspect includes an automatic sample injector, the chromatographic analysis device has all the technical effects of the automatic sample injector, which will not be described in detail here.

[0022] Other features and advantages of the present application will be described in the subsequent description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology of the present application.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of the automatic sample injector provided in an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of the needle washing assembly of the automatic sampler provided in an embodiment of the present application.

[0027] Reference numerals: 100, needle washing assembly; 101, needle washing tank; 1011, first tank body; 1012, second tank body; 102, drainage tank; 103, first connector; 104, second connector; 105, overflow tank; 200, cleaning assembly; 201, cleaning bottle; 202, cleaning pipeline; 203, first sensor; 204, second sensor; 205, filter element; 206, first extraction pump; 207, Cleaning liquid; 300, extraction component; 301, second extraction pump; 302, multi-way valve; 3021, first port; 3022, second port; 3023, third port; 3024, fourth port; 3025, fifth port; 3026, sixth port; 400, collection barrel; 401, waste liquid; 402, exhaust port; 500, sample bottle; 600, injection needle; 601, inner wall; 602, outer wall. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0029] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0030] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0031] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or point connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] Furthermore, the terms "first," "second," and the like are primarily used to distinguish different devices, elements, or components (which may or may not be the same in type and configuration) and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more. Example

[0033] A chromatograph is an instrument that uses chromatography to perform qualitative and quantitative analysis on substances and to study the physical and chemical properties of substances. When performing chromatographic analysis, an automatic sampler is usually used to automatically draw samples into the chromatograph for testing. During use, because the automatic sampler uses a sampling needle to collect different samples, when switching to collect different sample solutions, the sampling needle needs to be washed first.

[0034] During the design process, the inventor discovered that some current needle washing devices will accumulate cross-contamination during the operation of the equipment. The cleaning height of the outer wall of the injection needle will decrease as the cleaning liquid level in the cleaning bottle decreases. At the same time, the sample residue on the outer wall will be brought into the next sample to be tested, causing the residue of the previous sample to be mixed into the sample to be tested and contaminate the sample; or during the operation of the equipment, it is necessary to precisely control the speed of the input cleaning liquid to be greater than the speed of the outflow from the bottom drainage hole to form an overflow effect at the top of the needle washer, ensuring that the top overflow and bottom drainage of the needle washer exist at the same time, the amount of cleaning liquid used is large, and the needle washer is integrated into the sample tray and rotates with the sample tray to form an open docking with the bottom water receiving trough, and the annular structure of the water receiving trough is complex and easy to form waste liquid residue.

[0035] In view of this, if Figure 1-Figure 2As shown, in the first aspect, the embodiments of the present application provide an automatic sample injector, comprising: a needle washing assembly 100, comprising a needle washing groove 101 and a liquid discharge groove 102, the needle washing groove 101 being in communication with the liquid discharge groove 102, and the needle washing groove 101 being configured to accommodate at least part of a structure of a sample injection needle 600; a cleaning assembly 200, comprising a cleaning structure and a first suction pump 206, the cleaning structure being connected to the first suction pump 206, the cleaning structure being configured to accommodate a cleaning liquid 207, and the first suction pump 206 being in communication with the needle washing groove 101 and being configured to suck the cleaning liquid 207 and clean an outer wall 602 of the sample injection needle 600; and a suction assembly 300, connected to the sample injection needle 600 and configured to suck a sample in the sample injection needle 600 or the cleaning liquid 207 for cleaning an inner wall 601 of the sample injection needle 600.

[0036] For example, the automatic sample injector has a sample injection state and an analysis state. When the automatic sample injector is in the sample injection state, the sample injection needle 600 is moved to a position of a sample bottle 500 by a mechanical arm, and is inserted into the sample bottle 500 to a depth of about 90% and then stopped, the suction assembly 300 is started to suck the sample into a quantitative ring of the suction assembly 300, the suction assembly 300 is switched to make the sample in the quantitative ring enter a pump column flow path, and the sample is tested. At this time, the outer wall 602 and the inner wall 601 of the sample injection needle 600 are both left with the sample. The suction assembly 300 is switched again to enter the analysis state, the sample injection needle 600 is moved to the needle washing groove 101 by the mechanical arm, the first suction pump 206 is operated, the cleaning liquid 207 gradually overflows the needle washing groove 101 and flows to the liquid discharge groove 102, thereby completing the cleaning of the outer wall 602 of the sample injection needle 600, and the suction assembly 300 is operated to suck the cleaning liquid 207 in the needle washing groove 101 to the inner wall 601 of the sample injection needle 600, thereby completing the cleaning of the inner wall 601 of the sample injection needle 600. It can be understood that, during the cleaning of the sample injection needle 600, the suction assembly 300 and the first suction pump 206 can be used in combination, and the number of repetitions includes but is not limited to three times. Then, the sample injection needle 600 is moved to the position of the sample bottle 500 by the mechanical arm to perform the next sample injection, and the cycle is repeated.

[0037] It can be understood that the needle washing trough 101 and the drainage trough 102 can be distributed in the up and down directions, and the needle washing assembly 100 also includes an overflow trough 105, which is located between the needle washing trough 101 and the drainage trough 102, and is used to connect the needle washing trough 101 and the drainage trough 102, and the distribution direction of the overflow trough 105 includes but is not limited to the horizontal direction.

[0038] In the above-mentioned implementation process, when the automatic sampler is running in the injection state, the extraction component 300 works, and the sample enters the extraction component 300 after passing through the injection needle 600, and is switched by the extraction component 300 to enter the analysis state. Then the injection needle 600 is placed in the needle washing groove 101, and the first extraction pump 206 extracts the cleaning liquid 207 in the cleaning structure to the needle washing groove 101, and finally flows to the drainage groove 102, thereby completing the cleaning of the outer wall 602 of the injection needle 600. When the extraction component 300 is extracting, the cleaning liquid 207 in the needle washing groove 101 can be extracted to the inner wall 601 of the injection needle 600, and the inner wall 601 of the injection needle 600 is cleaned. The whole process can effectively and reliably clean the injection needle completely, and prepare for the pre-action for the next injection.

[0039] like Figure 1 As shown, the cleaning structure includes a cleaning bottle 201, a cleaning pipeline 202 and a first sensor 203, wherein the first sensor 203 includes but is not limited to a liquid level sensor, the cleaning pipeline 202 is connected to the cleaning bottle 201 and the first extraction pump 206, and the first sensor 203 is connected to the cleaning bottle 201 for detecting the cleaning liquid 207 in the cleaning bottle 201, wherein the upper end of the cleaning bottle 201 may be provided with an air inlet, and the air inlet is used to ensure the pressure in the cleaning bottle 207 to avoid negative pressure in the cleaning bottle 207; it can be understood that the capacity of the cleaning bottle 201 is not specifically limited, and in order to improve work efficiency, the automatic sampler may further include a filling component, which is connected to the cleaning bottle 201 for filling the cleaning liquid 207 into the cleaning bottle 201 according to the information fed back by the first sensor 203.

[0040] In the above-mentioned implementation process, the cleaning pipeline 202 is respectively connected to the cleaning bottle 201 and the first extraction pump 206. When the automatic sampler enters the analysis state, the cleaning liquid 207 in the cleaning bottle 201 can be extracted into the needle washing assembly 100 under the action of the first extraction pump 206, thereby completing the cleaning of the inner and outer walls of the injection needle 600. At the same time, a first sensor 203 is arranged on the cleaning bottle 201, which can be used to detect the usage of the cleaning liquid 207 in the cleaning bottle 201, thereby improving convenience.

[0041] In some embodiments, the cleaning structure further comprises a second sensor 204, which includes but is not limited to a liquid level sensor, the second sensor 204 is connected to the cleaning pipeline 202 for detecting the cleaning liquid 207 in the cleaning pipeline 202, and the position of the second sensor 204 connected to the cleaning pipeline 202 is not specifically limited.

[0042] In the above implementation process, by setting the second sensor 204 on the cleaning pipeline 202, it can be detected whether the cleaning liquid 207 is extracted to the cleaning pipeline 202 under the action of the second sensor 204, so as to deduce whether the cleaning bottle 201 still contains the cleaning liquid 207, thereby improving the intelligence and convenience of the automatic sampler.

[0043] Referring to Figure 1 , the cleaning structure further comprises a filter 205, which includes but is not limited to a filter head, the filter 205 is connected to the cleaning pipeline 202 for filtering when the cleaning liquid 207 enters the cleaning pipeline 202, wherein the filter 205 can be located inside the cleaning bottle 201 or inside the cleaning pipeline 202, which is not specifically limited here.

[0044] In the above implementation process, by setting the filter 205 on the cleaning pipeline 202, the filter 205 can filter the cleaning liquid 207 when the first extraction pump 206 extracts the cleaning liquid 207, which ensures the cleanliness of the cleaning liquid 207 entering the needle washing assembly 100 and is beneficial to the cleaning of the sampling needle 600, thereby avoiding pollution to the sample.

[0045] As shown in Figure 2 , the needle washing groove 101 comprises a first groove body 1011 and a second groove body 1012, the first groove body 1011 is connected to the second groove body 1012, and the cross-sectional size of the first groove body 1011 gradually increases in the direction away from the second groove body 1012, one side of the second groove body 1012 away from the first groove body 1011 is connected to the first extraction pump 206, for example, the first groove body 1011 is arranged above the second groove body 1012, one side of the first groove body 1011 away from the second groove body 1012 is arranged as an inlet, the inlet is used for placing or taking out the sampling needle 600 from the needle washing groove 101, and the shape of the first groove body 1011 can be conical or the like.

[0046] In the above implementation process, by setting the needle washing tank 101 as a first tank body 1011 and a second tank body 1012, and the size of the first tank body 1011 gradually increases in the direction away from the second tank body 1012, it can not only guide the injection needle 600, but also reduce the amount of cleaning liquid 207 used each time. In the direction away from the second tank body 1012, the flow speed of the cleaning liquid 207 can be increased, thereby improving the cleaning effect on the outer wall 602 of the injection needle 600.

[0047] In some embodiments, the extraction component 300 includes a second extraction pump 301 and a multi-way valve 302 , the second extraction pump 301 is connected to the multi-way valve 302 , and the multi-way valve 302 is connected to the injection needle 600 .

[0048] Exemplarily, the multi-way valve 302 includes but is not limited to a six-way valve, and the multi-way valve 302 includes a quantitative loop, a pump column and six ports, wherein the first port 3021 is connected to the sixth port 3026 and the quantitative loop, the second port 3022 and the third port 3023 are respectively connected to the pump column, the fourth port 3024 is respectively connected to the quantitative loop and the fifth port 3025, the fifth port 3025 is connected to the injection needle 600 through a pipeline, and the sixth port 3026 is connected to the second extraction pump 301 through a pipeline.

[0049] In the above implementation process, the second extraction pump 301 is connected to the multi-way valve 302, so that when the second extraction pump 301 is extracting, it can not only complete the injection state of the automatic sampler, but also when the automatic sampler is switched to the analysis state, the second extraction pump 301 can extract the cleaning liquid 207 to complete the cleaning of the inner wall 601 of the injection needle 600, thereby avoiding contamination of the sample when switching to the injection state again.

[0050] In some embodiments, the autosampler further includes a collection barrel 400, which is connected to the second extraction pump 301 of the extraction assembly 300 and the drainage trough 102. The collection barrel 400 collects waste liquid 401 generated when cleaning the injection needle 600, thereby preventing the waste liquid 401 from contaminating the autosampler or other equipment, thereby improving the cleanliness of the autosampler.

[0051] In some embodiments, a vent 402 is provided on one side of the collection barrel 400. Providing the vent 402 on the collection barrel 400 facilitates exhaust when the collection barrel 400 collects the waste liquid 401, thereby preventing the collection barrel 400 from being unable to collect the waste liquid 401 due to excessive pressure in the collection barrel 400.

[0052] In some embodiments, the needle washing assembly 100 further comprises a first joint 103 and a second joint 104, the first joint 103 comprising but not limited to a cone joint, the second joint 104 comprising but not limited to a cone joint, the first joint 103 connecting the needle washing groove 101 and the first pumping device 206 respectively, and the second joint 104 connecting the liquid discharging groove 102 and the collecting barrel 400 respectively.

[0053] In a second aspect, the present application further provides a chromatographic analysis device comprising the automatic sample injector as described above.

[0054] The chromatographic analysis device provided by the second aspect comprises the automatic sample injector, and therefore has all the technical effects of the automatic sample injector, which will not be described herein.

[0055] In all the embodiments of the present application, "large", "small", "more", "less", "upper" and "lower" are relative, and the description of such relative terms will not be described herein.

[0056] It should be understood that the "in the present embodiment", "in the present embodiment" or "as an optional embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present application. Therefore, "in the present embodiment", "in the present embodiment" or "as an optional embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0057] In various embodiments of the present application, it should be understood that the size of the serial number of the above processes does not mean the inevitable sequence of execution, and the execution sequence of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0058] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An automatic sample injector, characterized in that include: A needle washing assembly, comprising a needle washing trough and a liquid drain trough, wherein the needle washing trough is connected to the liquid drain trough, and the needle washing trough is configured to accommodate at least a portion of the structure of the injection needle; A cleaning assembly, comprising a cleaning structure and a first extraction pump, wherein the cleaning structure is connected to the first extraction pump, the cleaning structure is configured to accommodate a cleaning liquid, and the first extraction pump is connected to the needle wash tank to extract the cleaning liquid and clean the outer wall of the injection needle; The extraction component is connected to the injection needle and is used to extract the sample in the injection needle, or extract the cleaning liquid to clean the inner wall of the injection needle.

2. The automatic sample injector according to claim 1, characterized in that The cleaning structure includes a cleaning bottle, a cleaning pipeline and a first sensor. The cleaning pipeline is connected to the cleaning bottle and the first extraction pump. The first sensor is connected to the cleaning bottle and is used to detect the cleaning liquid in the cleaning bottle.

3. The automatic sample injector according to claim 2, characterized in that The cleaning structure further includes a second sensor connected to the cleaning pipeline and configured to detect the cleaning fluid in the cleaning pipeline.

4. The automatic sample injector according to claim 3, characterized in that The cleaning structure further includes a filter element, which is connected to the cleaning pipeline and is used for filtering the cleaning liquid when it enters the cleaning pipeline.

5. The automatic sample injector according to claim 1, characterized in that The needle washing tank includes a first tank body and a second tank body. The first tank body is connected to the second tank body, and the cross-sectional size of the first tank body gradually increases along the direction away from the second tank body. The side of the second tank body away from the first tank body is connected to the first extraction pump.

6. The automatic sample injector according to claim 1, characterized in that The extraction component includes a second extraction pump and a multi-way valve, the second extraction pump is connected to the multi-way valve, and the multi-way valve is connected to the injection needle.

7. The automatic sample injector according to any one of claims 1 to 6, characterized in that: The automatic sample injector further comprises a collecting barrel connected to the extraction component and the drainage trough.

8. The automatic sample injector according to claim 7, characterized in that An exhaust port is arranged on one side of the collecting barrel.

9. The automatic sample injector according to claim 7, characterized in that The needle washing assembly further includes a first connector and a second connector, wherein the first connector is respectively connected to the needle washing tank and the first extraction pump, and the second connector is respectively connected to the drainage tank and the collection bucket.

10. A chromatographic analysis device, characterized in that: The invention comprises an automatic sample injector as described in any one of claims 1 to 9.

Images