CN211148679U - Miniature liquid sampling device in laboratory - Google Patents

Abstract

The utility model relates to an experimental apparatus field, concretely relates to miniature liquid sampling device in laboratory, include: a support; the sample injection injector is used for loading a sample; the sample volatilizer is communicated with a sample outlet of the sample injection injector and is used for loading carrier gas so that the sample is conveyed to the reaction system under the carrying of the carrier gas; and the driving assembly is abutted against a piston rod of the sample injection injector and used for pushing the piston push rod to convey the sample to the sample volatilizer, and when the reaction of the liquid organic matter is researched, the control on the volatilization rate of the sample can be realized only by controlling the driving speed of the driving assembly and the flowing speed of the carrier gas, and meanwhile, the amount and the speed of the sample entering the reaction system can be controlled, so that the stable operation of the reaction system can be ensured.

Description

Miniature liquid sampling device in laboratory

Technical Field

The utility model relates to an laboratory glassware field, concretely relates to miniature liquid sampling device in laboratory.

Background

Under the condition of a laboratory, in the process of researching the combustion reaction mechanism of the organic compound which is liquid at normal temperature, because the liquid organic compound has certain volatility at normal temperature, how to control the volatilization rate of the substance as a reactant in the reaction process is a difficult point in the reaction process.

The conventional sample feeding mode usually adopts a traditional glass volatilization vessel as a sample feeder, and in the using process, a sample is injected into the glass volatilization vessel at one time, and then the volatilization rate of the sample is controlled by controlling the experiment temperature.

For some liquid organic compounds with high toxicity or high price, because of the health problem of operators and the research cost, the organic compounds are not suitable for experiments with large dosage, and at the moment, the traditional glass volatilization vessel is used as a sample injector, the adding amount of the sample is difficult to meet the requirement of stable operation of the reaction system because the volatilization rate of the sample is too fast. Therefore, the development of a micro liquid injector is essential.

Disclosure of Invention

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the liquid organic compound that has high toxicity or the price is comparatively expensive that needs among the prior art carry out the micro-reaction and using traditional glass to volatilize the defect that the demand of reaction system steady operation can't be satisfied owing to the rate of volatilization is too fast when the ware is regarded as the injector to a miniature liquid sampling device in laboratory is provided.

In order to solve the technical problem, the utility model discloses a technical scheme does:

the utility model provides a miniature liquid sampling device in laboratory which characterized in that includes:

a support;

the sample injection syringe is arranged on the bracket and used for loading a sample, and comprises a piston rod and a cylinder body;

the sample volatilizer is communicated with the sample outlet of the sample injection injector and is used for loading carrier gas so that the sample is conveyed to the reaction system under the carrying of the carrier gas; and the number of the first and second groups,

and the driving component can be abutted with the piston rod and is used for driving the piston abutting piece to move along the axial direction of the cylinder body so as to convey the sample into the sample volatilizer.

Further, the support includes parallel arrangement's first support and second support, the barrel is installed on the first support, the piston rod is slidingtype to be installed on the second support, the central axis of piston rod with the central axis of barrel is on same straight line.

Furthermore, the cylinder body is detachably assembled with the first support, and the piston rod is detachably assembled with the second support.

Furthermore, a first through hole is formed in the first support, and an elastic fixing component used for applying elastic force to the cylinder body so as to lock or unlock the cylinder body on the first support is arranged in the first through hole.

Furthermore, the elastic fixing component comprises at least one arched elastic sheet, a containing groove is formed in the inner wall of the first through hole, one end of the arched elastic sheet is fixedly assembled with the bottom wall of the containing groove, the other end of the arched elastic sheet is contained in the containing groove and extends towards the axial direction of the first through hole, the opening of the arched elastic sheet faces towards the containing groove, and the arched elastic sheet is elastically deformed when the barrel is contained in the through hole.

Furthermore, a second through hole is formed in the second support, the miniature liquid sampling device in the laboratory further comprises an assembling block and a locking assembly, the piston rod is assembled in a sliding mode through the assembling block, the assembling block passes through the locking assembly and the second support is locked or unlocked to achieve the piston rod and the second support are detachably assembled.

Further, the locking assembly comprises a bolt and a nut matched with the bolt.

Further, the driving assembly includes:

an abutting member for abutting against the piston rod; and

the first driving source is assembled with the abutting piece and used for driving the abutting piece to move so that the abutting piece drives the piston rod to move along the axial direction of the cylinder.

Furthermore, advance a kind syringe and be provided with more than two, miniature liquid sampling device still include in the laboratory one end with first drive source assembly, the other end with butt spare is assembled mutually, by first drive source drive motion can drive the transposition subassembly of butt spare and the piston rod butt of different advance a kind syringes.

Furthermore, the sampling injectors are arranged in a circumferential manner in the vertical direction, and the transposition assembly comprises:

the sliding block is assembled with the first driving source and can be driven by the first driving source to move along the axial direction of the cylinder;

a turntable on which the abutment member is mounted; and the number of the first and second groups,

and the main body of the second driving source is arranged on the sliding block, and the output end of the second driving source is assembled with the rotary disc and used for driving the rotary disc to rotate.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a micro liquid sample introduction device in a laboratory, a sample is loaded in a sample introduction injector by arranging a bracket, the sample introduction injector, a sample volatilizer and a driving component, the sample volatilizer is communicated with a sample outlet of the sample introduction injector, carrier gas flows in the sample volatilizer, meanwhile, the sample volatilizer is communicated with the reaction system, so that the sample can be carried into the reaction system by utilizing the flow of the carrier gas, and the drive assembly can drive the piston rod of the syringe to move so as to push the sample in the syringe into the sample volatilizer, when the reaction of the liquid organic matter is researched, only by controlling the driving speed of the driving assembly and the flow speed of the carrier gas, the control of the volatilization rate of the sample can be realized, and the amount and the speed of the sample entering the reaction system can be controlled, so that the stable operation of the reaction system can be ensured.

2. The utility model provides a miniature liquid sampling device in laboratory, through setting up the support to first support and second support including being parallel to each other, and the barrel is installed alone on first support, the piston rod is installed alone on the second support, and when the barrel was installed on first support and the piston rod was installed on the second support, the central axis of piston rod is located same straight line with the central axis of barrel, set up like this, make the piston rod can be carried out special fixed alone, thereby can improve the mobility stability of piston rod, and then can avoid in-service use in-process, because the piston rod is thinner, if not fix alone the piston rod, then probably lead to the piston rod to take place skew and lead to piston rod rupture or crooked and the condition of blocking to take place with the barrel in advance kind process.

3. The utility model provides a miniature liquid sampling device in laboratory through setting up barrel and first support as detachable assembly, and the piston rod sets up to detachable assembly with the second support, on the one hand, can conveniently change barrel or piston rod when barrel or piston rod take place to damage, and on the other hand, the user can be changed the specification of barrel and piston rod according to the demand of self experiment to miniature liquid sampling device's in the extension laboratory application.

4. The utility model provides a miniature liquid sampling device in laboratory is through seting up first through-hole on first support to set up the elastic fixation subassembly on first through-hole, when the barrel holding is in first through-hole, thereby the elastic fixation subassembly can take place elastic deformation and apply the elastic force to the barrel in order to lock the barrel on first support, can realize locking or unblock fixed, easy operation convenience to the barrel promptly through the elastic deformation of the elastic fixation subassembly.

5. The elastic fixing component provided by the utility model is provided with the containing groove on the inner wall of the through hole and is arranged into the arch-shaped elastic piece, wherein one end of the arched elastic sheet is accommodated in the accommodating groove and fixedly assembled with the inner wall of the accommodating groove, the other end of the arched elastic sheet is accommodated in the accommodating groove and extends towards the axial direction of the first through hole, and the opening of the arched elastic sheet faces the containing groove, the cylinder body can be abutted against the arched elastic sheet, and when the sample injection injector is contained in the through hole, the arched elastic sheet is elastically deformed, when the cylinder body is required to be installed, the cylinder body is only required to be accommodated in the through hole, under the extrusion action of the cylinder, the free end of the arched elastic sheet slides along the containing groove so as to lead the arched elastic sheet to generate elastic deformation, and then make the elastic fixation subassembly can exert an elastic force to the barrel to realize the fixed of barrel, easy operation is convenient.

6. The utility model provides a miniature liquid sampling device in laboratory, through set up the second through-hole on the second support, and corresponding setting assembly piece and locking subassembly, wherein, piston rod and assembly piece slidingtype assembly, the locking subassembly is used for realizing the locking between assembly piece and the second support or unlocks, thereby make the piston rod can realize the detachable assembly with the second support through the assembly piece, the locking that utilizes the locking subassembly to realize assembly piece and second support also can make the piston rod can be installed on the second support by more stable, when will changing the piston rod, unlocks whole assembly piece and second support, then change can.

7. The utility model provides a locking Assembly, bolt and nut are locking Assembly commonly used in the machine-building field, and the source is extensive, easily obtains, and simple to operate is swift.

8. The utility model provides a drive assembly, through setting up drive assembly to including butt and first driving source, the piston rod butt of butt and syringe, first driving source assembles with the butt mutually, thereby can realize the removal of piston rod promptly through the drive of first driving source and can realize carrying the sample in the sample syringe to the purpose in the sample volatilizer, has realized the autoinjection of sample injector, and simple structure, easily realizes.

9. The utility model provides a miniature liquid sampling device in laboratory, set up to more than two through advancing the kind syringe, and set up the transposition subassembly on drive assembly, the transposition subassembly can drive the butt and switch on the piston rod butt position of different syringes, thereby can realize can automatic switch over to next advance the kind syringe and carry out the output of sample after the sample in one advances the kind syringe uses up, thereby the time of having practiced thrift operating personnel and changing the kind syringe at a research in-process, can avoid simultaneously in the experimentation because of spending the experiment interrupt that a large amount of time supplyed the sample and lead to.

10. The utility model provides a miniature liquid sampling device in laboratory, through setting up the syringe of advancing to be the circumference shape arrangement in vertical direction, the transposition subassembly sets up to include slider, carousel and second driving source, the slider assembles with first drive source, the butt piece is installed on the carousel, the second driving source assembles with the carousel, be used for driving the carousel to rotate, after the sample in a sample syringe is used up, only need first driving source drive slider to keep away from the sample syringe to drive butt piece and piston rod separation, then drive the carousel by second driving source and rotate and drive butt piece and next sample syringe's piston rod alignment, reuse first driving source drive slider motion at last and drive butt piece and new piston rod butt can realize the switching of butt piece on the piston rod butt position of different syringes, the whole operation process can be automatically realized by the matching of the first power source and the second power source, and the operation is simple and convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a micro liquid sampling device in a laboratory according to embodiment 1 of the present invention;

fig. 2 is a sectional view of the first bracket, the elastic fixing component and the cylinder body in the embodiment 1 of the invention when assembled;

fig. 3 is an assembly diagram of the second bracket, the assembly block, the locking assembly and the piston rod in embodiment 1 of the present invention;

reference numerals:

1. a support; 11. a first bracket; 12. a second bracket; 2. a sample injection syringe; 21. a barrel; 22. a piston rod; 3. a sample volatilizer; 31. an air inlet; 32. an air outlet; 4. a drive assembly; 41. an abutting member; 42. a first drive source; 421. a motor; 422. a screw rod; 423. a bearing table; 5. an elastic fixing component; 6. assembling the block; 7. a locking assembly; 8. a transposition assembly; 81. a slider; 82. a turntable; 83. a second driving source.

Detailed Description

The following examples are provided for better understanding of the present invention, and are not limited to the best mode, and do not limit the scope and content of the present invention, and any product that is the same or similar to the present invention, which is obtained by combining the features of the present invention with other prior art or the present invention, falls within the scope of the present invention.

The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.

Example 1

As shown in fig. 1, the present embodiment relates to a micro liquid sample injection device for a laboratory, which includes a support 1, a sample injector 2, a sample volatilizer 3, and a driving assembly 4.

The sample injector 2 is arranged on the bracket 1, a sample is loaded in the sample injector 2, the sample injector 2 comprises a cylinder 21 and a piston rod 22, and the loaded sample can be output through the movement of the piston rod 22 along the inner wall of the cylinder 21; the sample volatilizer 3 is communicated with a sample outlet of the sample injector 2, the sample volatilizer 3 is provided with a gas inlet 31 and an outlet gas, wherein a gas outlet 32 is communicated with the reaction system, carrier gas flows in the sample volatilizer 3, the carrier gas enters from the gas inlet 31 of the sample volatilizer 3 and is conveyed into the reaction system through the gas outlet 32, and the sample can be conveyed into the reaction system together under the carrying of the carrier gas; the drive assembly 4 may abut against a piston rod 22 of the sample injector 2, and the drive assembly 4 is configured to drive the piston rod 22 to move along the axial direction of the cylinder 21 so as to deliver the sample into the sample volatilizer 3.

Specifically, the drive assembly 4 includes the butt 41 and the first driving source 42, and the butt 41 can with the piston rod 22 butt, and the first driving source 42 assembles with the butt 41, and the first driving source 42 is used for driving the butt 41 to remove so that the butt 41 drives the piston rod 22 is followed the axial direction of barrel 21 removes, thereby can realize the removal of piston rod 22 through the drive of the first driving source 42 promptly and can realize carrying the purpose in the sample volatilizer 3 with the sample in the sample syringe, has realized the autoinjection of sample injector, and simple structure easily realizes.

In this embodiment, the first driving source 42 is configured to include a motor 421, a bearing stage 423 and a screw rod 422, a main body of the motor 421 is fixedly installed on the bearing stage 423, the abutting piece 41 is slidably assembled with the bearing stage 423, one end of the screw rod 422 is fixedly assembled with an output end of the motor 421, the other end of the screw rod 422 is rotatably assembled with the abutting piece 41, the abutting piece 41 can be driven to slide along the bearing stage 423 to abut against the piston rod 22 by cooperation of the motor 421 and the screw rod 422, in other embodiments, the first driving source 42 can also be directly configured as an air cylinder, only the motor 421 can achieve higher control accuracy than the air cylinder, and the moving rate of the abutting piece 41 can be controlled by directly controlling the operating power of the motor 421, so as to control. The abutment 41 may be selected from a push plate or a push rod.

Since the piston rod 22 is generally thin during actual use, if the piston rod 22 is not separately fixed, the piston rod 22 may deviate from the cylinder 21 during sampling to cause the piston rod 22 to be broken or bent to be jammed, in order to prevent the above situation, in the present embodiment, the bracket 1 is configured to include the first bracket 11 and the second bracket 12 that are parallel to each other, wherein the cylinder 21 is installed on the first bracket 11, the piston rod 22 is slidably installed on the second bracket 12, and when the cylinder 21 is installed on the first bracket 11 and the piston rod 22 is installed on the second bracket 12, the central axis of the piston rod 22 and the central axis of the cylinder 21 are located on the same straight line, so that the piston rod 22 can be separately and specially fixed, and thus the movement stability of the piston rod 22 can be improved.

In addition, different specifications of the sample injector 2 may be caused due to different requirements of different experiments, and in order to enable the micro liquid sample injector in the laboratory provided by this embodiment to adapt to different experimental requirements, in this embodiment, the assembly between the cylinder 21 and the first support 11 is configured as a detachable assembly, and the assembly between the piston rod 22 and the second support 12 is also configured as a detachable assembly.

Specifically, referring to fig. 1 and 2, a first through hole (not shown) is formed in the first bracket 11, an elastic fixing component 5 is disposed in the first through hole, and the elastic fixing component 5 is used for applying an elastic force to the cylinder 21 to lock or unlock the cylinder 21 on the first bracket 11. In this embodiment, the elastic fixing component 5 includes two oppositely disposed arched elastic pieces, the accommodating groove has been opened on the inner wall of the first through hole, one end of the arched elastic piece is fixedly assembled with the bottom wall of the accommodating groove, the other end is accommodated in the accommodating groove and extends towards the axial direction of the first through hole, the opening of the arched elastic piece faces the accommodating groove, and when the barrel 21 is accommodated in the through hole, the arched elastic piece is elastically deformed. When the barrel 21 is to be installed, the barrel 21 is only required to be accommodated in the through hole, under the extrusion action of the barrel 21, the free end of the arched elastic sheet slides along the accommodating groove to enable the arched elastic sheet to generate elastic deformation, and then the elastic fixing assembly 5 can apply an elastic force to the barrel 21, so that the barrel 21 is fixed, and the operation is simple and convenient. In other embodiments, the number of the arc-shaped elastic pieces may also be three or four, and the number of the arc-shaped elastic pieces is not limited, so that the cylinder 21 can be fixed.

Referring to fig. 1 and 3, a second through hole (not shown in the figures) is formed in the second support 12, the micro liquid sample injection device in the laboratory further includes an assembly block 6 and a locking assembly 7, the piston rod 22 is slidably assembled with the assembly block 6, the locking assembly 7 is used for locking or unlocking the assembly block 6 and the second support 12 so as to realize the detachable assembly of the piston rod 22 and the second support 12, when the piston rod 22 needs to be replaced, only the whole assembly block 6 and the second support 12 need to be unlocked, and then the assembly block 6 assembled with the piston rod 22 of another specification and the second support 12 need to be locked again, in this embodiment, the locking assembly 7 is configured to include a bolt and a nut matched with the bolt, the bolt and the nut are locking pieces commonly used in the instrument manufacturing industry, and have the advantages of wide source, cheapness and easy obtaining, and simple and convenient operation, in other embodiments, the locking assembly 7 may also be a snap or the like.

It should be noted that, in other deformable embodiments, the detachable assembly form between the cylinder 21 and the first bracket 11 and the detachable assembly form between the piston rod 22 and the second bracket 12 may be interchanged, or both the elastic fixing component 5 and the locking component 7 and the assembling block 6 may be used together to realize the detachable assembly, and the realization form of the detachable assembly is not limited. However, in the present embodiment, the detachable assembly between the piston rod 22 and the second bracket 12 is achieved by the cooperation of the locking assembly 7 and the assembly block 6, and since the piston rod 22 is locked when being mounted on the second bracket 12, the piston rod 22 can be more stable when moving.

In addition, because the volume of one sample injection injector 2 is not enough to meet the experiment requirement in the experiment process, after the sample in one syringe 2 is completely transferred, the operator needs to manually disassemble the syringe 2 and replace the new syringe 2, which takes a long time and causes the interruption of the experiment to affect the result of the experiment, so as to avoid the above situations, in this embodiment, two or more, specifically eight, sampling injectors 2 are provided, a transposition assembly 8 is further provided in the sampling device, one end of the transposition assembly 8 is assembled with the first driving source 42, the other end is assembled with the abutting member 41, the transposition assembly 8 can be driven by the first driving source 42 to move and simultaneously drive the abutting member 41 to abut against the piston rods 22 of different sampling injectors 2, therefore, the sample in one sample injector 2 can be automatically switched to the next sample injector 2 to output the sample after the sample in the next sample injector 2 is used up.

Specifically, the sampling injector 2 is circumferentially arranged in the vertical direction, the transposition assembly 8 includes a sliding block 81, a rotary table 82 and a second driving source 83, the sliding block 81 is assembled with the first driving source 42, the sliding block 81 can be driven by the first driving source 42 to move along the axial direction of the cylinder 21, specifically, when the first driving source 42 includes a motor 421, a bearing table 423 and a screw rod 422, the sliding block 81 is assembled with the bearing table 423 in a sliding manner and rotatably assembled with the screw rod 422, the abutting part 41 is installed on the rotary table 82, the main body of the second driving source 83 is installed on the sliding block 81, the output end is assembled with the rotary table 82, and the second driving source 83 is used for driving the rotary table 82 to rotate. After the sample in a sample injector is used up, only need first driving source 42 drive slider 81 to keep away from the sample injector thereby drive butt piece 41 and piston rod 22 separation, thereby drive butt piece 41 and next sample injector's piston rod 22 alignment by second driving source 83 drive carousel 82 rotates, thereby it can realize the switching of butt piece 41 on the piston rod 22 butt position of different injectors to reuse first driving source 42 drive slider 81 motion at last and drive butt piece 41 and new piston rod 22 butt, whole operation process can be realized automatically by the cooperation of first power supply and second power supply, and easy operation is convenient, and the time of operating personnel changing into injection injector 2 in a research process has been practiced thrift. In the present embodiment, the second driving source 83 is also provided as a motor 421.

The usage principle of the micro liquid sample injection device in the laboratory of the embodiment is roughly as follows:

through setting up support 1, advance kind syringe 2, sample volatilizer 3 and drive assembly 4, the sample loads in advancing kind syringe 2, sample volatilizer 3 and the outlet port switch-on of advancing kind syringe 2, it has the carrier gas to circulate in the sample volatilizer 3, simultaneously sample volatilizer 3 and reaction system switch-on, so can utilize the flow of carrier gas to carry the sample to reaction system in, thereby drive assembly 4 can drive the piston rod 22 motion of syringe with the sample propelling movement in the syringe to sample volatilizer 3 in, at the reaction of research liquid organic matter, only need the flow velocity of drive speed and carrier gas through control drive assembly 4, can realize the control to the volatilization rate of sample, can control the volume and the speed that the sample got into reaction system simultaneously, thereby can guarantee reaction system's steady operation.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. The utility model provides a miniature liquid sampling device in laboratory which characterized in that includes:

a support (1);

the sample injection injector (2) is arranged on the bracket (1) and used for loading a sample, and the sample injection injector (2) comprises a piston rod (22) and a cylinder body (21);

the sample volatilizer (3) is communicated with the sample outlet of the sample injection injector (2) and is used for loading carrier gas so that the sample is conveyed to the reaction system under the carrying of the carrier gas; and the number of the first and second groups,

a drive assembly (4) abuttable to the piston rod (22) for driving the piston abutment (41) to move in the axial direction of the cylinder (21) for delivering the sample into the sample volatilizer (3).

2. The micro liquid sample introduction device in the laboratory according to claim 1, wherein the support (1) comprises a first support (11) and a second support (12) which are arranged in parallel, the cylinder (21) is installed on the first support (11), the piston rod (22) is slidably installed on the second support (12), and the central axis of the piston rod (22) and the central axis of the cylinder (21) are on the same straight line.

3. The micro liquid sample introduction device in the laboratory according to claim 2, wherein the cylinder (21) is detachably assembled with the first support (11), and the piston rod (22) is detachably assembled with the second support (12).

4. The laboratory micro liquid sampling device according to claim 3, wherein the first support (11) is provided with a first through hole, and an elastic fixing component (5) for applying an elastic force to the cylinder (21) to lock or unlock the cylinder (21) on the first support (11) is arranged in the first through hole.

5. The laboratory micro liquid sampling device according to claim 4, wherein the elastic fixing component (5) comprises at least one arched elastic sheet, the inner wall of the first through hole is provided with a containing groove, one end of the arched elastic sheet is fixedly assembled with the bottom wall of the containing groove, the other end of the arched elastic sheet is contained in the containing groove and extends towards the axial direction of the first through hole, the opening of the arched elastic sheet faces towards the containing groove, and the arched elastic sheet is elastically deformed when the cylinder (21) is contained in the through hole.

6. The micro liquid sample introduction device in the laboratory according to claim 3, wherein a second through hole is opened on the second support (12), the micro liquid sample introduction device in the laboratory further comprises an assembling block (6) and a locking component (7), the piston rod (22) is assembled with the assembling block (6) in a sliding manner, and the assembling block (6) is locked or unlocked with the second support (12) through the locking component (7) to realize the detachable assembly of the piston rod (22) and the second support (12).

7. The micro liquid sample introduction device in laboratory according to claim 6, characterized in that the locking assembly (7) comprises a bolt and a nut matching with the bolt.

8. The micro liquid sample introduction device in a laboratory according to claim 1, wherein the driving assembly (4) comprises:

an abutment member (41) for abutting against the piston rod (22); and

a first driving source (42) which is assembled with the abutting piece (41) and is used for driving the abutting piece (41) to move so that the abutting piece (41) drives the piston rod (22) to move along the axial direction of the cylinder body (21).

9. The micro liquid sampling device in the laboratory according to claim 8, wherein the sampling injectors (2) are provided with more than two, and the micro liquid sampling device in the laboratory further comprises a transposition assembly (8) which is assembled with the first driving source (42) at one end, assembled with the abutting piece (41) at the other end, driven by the first driving source (42) to move and can drive the abutting piece (41) to abut against the piston rods (22) of different sampling injectors (2).

10. The micro liquid sample introduction device in a laboratory according to claim 9, wherein the sample injectors (2) are arranged in a circumferential manner in a vertical direction, and the index assembly (8) comprises:

a slider (81) fitted with the first drive source (42) and movable in the axial direction of the cylinder (21) by the first drive source (42);

a dial (82), said abutment (41) being mounted on said dial (82); and the number of the first and second groups,

and the main body of the second driving source (83) is arranged on the sliding block (81), and the output end of the second driving source is assembled with the rotary disc (82) and used for driving the rotary disc (82) to rotate.

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