A sampling device and operation method for gas chromatograph detection

Abstract

The present invention relates to the field of gas chromatograph detection technology, specifically to a sampling device and operation method for gas chromatograph detection, comprising a chromatograph body, wherein the left surface of the chromatograph body is provided with a sampling port. The sampling device and operation method for gas chromatograph detection are connected through a cavity above the sample liquid level and a cavity below the push plug, and a compression spring pushes a slide bar and a floating plug upward to compress the cavity above the liquid level until the top of the connecting tube abuts against the sample loading tube to disconnect the connection. The floating plug can use a floating sheet to monitor the sample coverage area, and use the connection of the closed area to control the floating plug to move upward, thereby reducing the presence of cavities in the sample area, so that the push plug can be moved upward to press and deliver the sample in real time. On the one hand, it ensures that the operator's control can be accurately matched with the sample introduction process, avoiding the need for the push plug to push out air first, resulting in the inability to operate the sample in real time, and on the other hand, it can avoid pressing air into the chromatograph body to affect normal detection.

Description

Technical Field

[0001] The invention relates to the technical field of gas chromatograph detection, in particular to a sample injection device and an operation method for gas chromatograph detection. Background Art

[0002] Gas chromatograph refers to a chromatographic analysis instrument that uses gas as the mobile phase; its principle is mainly to use the differences in the boiling point, polarity and adsorption properties of substances to achieve the separation of mixtures. Gas chromatographs are usually used to analyze organic matter in soil that is thermally stable and has a boiling point not exceeding 500°C, such as volatile organic compounds, polycyclic aromatic hydrocarbons, phthalates, etc., and have the advantages of being fast, effective, and highly sensitive.

[0003] The existing patent (publication number: CN116087387A) discloses a sample introduction device for a gas chromatograph, including a gas chromatograph body, an introduction tube, and an injection tube. The gas chromatograph body is fixedly connected with an introduction tube, and one end of the introduction tube extends to the inside of the gas chromatograph body and is connected to a detection and analysis device. The introduction tube is connected with an injection tube, and a one-way valve is connected in the injection tube. The sample is added from the injection tube, and the one-way valve controls the one-way flow of the sample to avoid backflow. The introduction tube is connected with a sample introduction component. After the sample is injected into the introduction tube in the above-mentioned prior art, there is a cavity in the tube. When pushing the sample, the cavity area easily causes air to enter the chromatograph and affect the detection. In addition, during the pushing operation, the air causes the sample to be unable to be injected in real time.

[0004] In view of this, we propose a sample injection device and an operation method for gas chromatograph detection. Summary of the invention

[0005] The object of the present invention is to provide a sample injection device and an operation method for gas chromatograph detection, so as to solve the problem that after the sample is injected into the introduction tube in the prior art proposed in the above background technology, there is a cavity in the tube, and when the sample is pushed, the cavity area is easy to cause air to enter the chromatograph and affect the detection, and when the push operation is performed, the air causes the sample to be unable to be injected in real time. In order to achieve the above purpose, the present invention provides the following technical scheme: a sample injection device for gas chromatograph detection, comprising a chromatograph body, a sample injection port is provided on the left side surface of the chromatograph body, and a sample tube is fixedly installed at the sample injection port, an injection plug is provided on the side surface of the sample tube, and an electric cylinder is fixedly provided at the bottom of the sample tube, the telescopic rod of the electric cylinder penetrates into the sample tube, and the telescopic end of the electric cylinder is fixedly connected to a push plug.

[0006] The push plug and the sample loading tube are provided with a space remover.

[0007] The deaerator includes a slide rod movably inserted into the surface of the push plug, and the top of the slide rod is fixedly connected to a floating plug, the lower side of the slide rod is movably sleeved with a compression spring, and the two ends of the compression spring are connected to the push plug and the slide rod, and the compression spring pushes the slide rod and the floating plug to move upward.

[0008] A groove is provided on the top surface of the floating plug, and a floating sheet is movably arranged in the groove. A connecting pipe is fixedly inserted through the surface of the floating sheet, and the connecting pipe is set as a hollow structure.

[0009] An inner hole is opened inside the sliding rod, and the upper end of the inner hole is connected to the groove, and the lower end is connected to the outside. The connecting pipe is slidably connected in the inner hole, and the lower side of the inner hole is fixedly connected with a plunger through a bracket, and the plunger is inserted into the bottom end of the connecting pipe.

[0010] A filter assembly is arranged between the sample loading tube and the sample inlet.

[0011] Preferably, the filter assembly includes a connecting plate arranged between the sample loading tube and the sample inlet, and a through hole connected to the sample loading tube and the sample inlet is vertically opened on the connecting plate, four side ports connected to the through holes are opened on the side surface of the connecting plate, and a slide groove connected to the side ports is opened on the top surface of the connecting plate, a slide is slidably connected in the slide groove, and a spring cap that moves up and down is arranged on the top of the slide, and a slot matching the spring cap is opened on the slide groove.

[0012] A sleeve matched with the through hole is arranged in the side opening, and the sleeve is fixedly connected to the slide, and a flow disc, a purification disc and impurity removal cotton are arranged inside the sleeve respectively.

[0013] A quick-release assembly is arranged between the sleeve and the flow disc, the purification disc and the impurity-removing cotton.

[0014] Preferably, the quick-release assembly includes a cutout opened in the middle of the sleeve, and a connecting rod is fixedly arranged in the cutout, three supporting bowls are movably arranged in the cutout, and the supporting bowls are rotatably connected to the connecting rod, and magnetic rings are fixedly arranged inside the three supporting bowls, and the flow disk, purification disk, and impurity removal cotton are respectively arranged in the three supporting bowls and supported by the magnetic rings.

[0015] Preferably, the inner top wall of the sample loading tube is provided with an embedding hole matching with the top end of the connecting tube.

[0016] Preferably, the embedding hole and the top end of the connecting tube are configured as mutually matching conical structures.

[0017] Preferably, the surface of the spring cap is provided with anti-slip grooves.

[0018] Preferably, positioning magnetic sheets are fixedly embedded on the top and bottom of the tray bowl.

[0019] A method for operating a sample injection device for gas chromatograph detection comprises the following steps:

[0020] S1. Inject the sample into the sample tube along the injection plug, start the electric cylinder to control the push plug to move up, and then push the sample into the chromatograph body along the injection port for detection;

[0021] S2. After the sample enters the sample tube, it falls on the floating plug. The floating sheet moves upward due to buoyancy and floats on the liquid surface. That is, the sample is located between the floating sheet and the floating plug. During this process, the connecting tube moves upward along the inner hole synchronously, and the bottom end of the connecting tube is separated from the plunger, so that the cavity above the sample liquid surface is connected with the cavity under the push plug. At this time, the compression spring pushes the slide rod and the floating plug upward to compress the cavity above the liquid surface until the top end of the connecting tube abuts against the sample tube and disconnects the connection;

[0022] S3. Before operating the sample tube to introduce the sample into the injection port, pull up the spring cap to disengage the card slot to unlock the slide. At this time, the slide can move along the slide slot and push the sleeve to align with the through hole. In this way, different sleeves and their internal flow disks are selected to control the injection according to the flow rate required for injection;

[0023] S4. When the flow plate, purification plate and impurity removal cotton need to be removed, pull up the spring cap to unlock the slide, and then slide the slide out of the slide slot to disengage the sleeve from the side opening. At this time, push the support bowl along the connecting rod to rotate out of the incision, and the operator can push up the flow plate, purification plate and impurity removal cotton from the lower side of each magnetic ring to take them out.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the present invention, the floating sheet floats on the liquid surface. During this process, the connecting tube moves upward along the inner hole synchronously, and the bottom end of the connecting tube is separated from the plunger, so that the cavity above the sample liquid surface is connected with the cavity under the push plug. At this time, the compression spring pushes the slide rod and the floating plug upward to compress the cavity above the liquid surface until the top end of the connecting tube abuts against the sample loading tube to disconnect. Compared with the existing direct push after injecting the sample, the above-mentioned floating plug can use the floating sheet to monitor the sample coverage area, and use the connectivity of the closed area to control the upward movement of the floating plug, thereby reducing the presence of cavities in the sample area, so that the upward movement of the push plug can press and deliver the sample in real time. On the one hand, it ensures that the operator's control can be accurately matched with the sample introduction process, avoiding the need to push out the air first due to the push plug, resulting in the inability to operate the sample in real time. On the other hand, it can avoid pressing air into the chromatograph body to affect normal detection.

[0026] In the present invention, the spring cap is pulled up to disengage from the slot, so that the slide is unlocked. At this time, the slide can move along the slot and push the sleeve to align with the through hole. Different sleeves and their internal flow disks are selected to control the injection according to the flow rate required for injection. Compared with the existing turntable switching, the different sleeves are independent structures. The operator only needs to push the sleeve corresponding to the demand to complete the adjustment, and subsequently only needs to push out the original sleeve and then push in the new sleeve, avoiding the waiting time of turntable rotation switching and making it more convenient to use.

[0027] In the present invention, the slide is unlocked by pulling up the spring cap, and then the slide is slid out of the slide groove, so that the sleeve is detached from the side opening. At this time, the support bowl is pushed out of the incision along the connecting rod, and the operator can push up the flow plate, purification plate, and impurity removal cotton from the lower side of each magnetic ring to take them out. Compared with the existing decentralized structure, the support bowl and the sleeve are integrated and can realize rapid opening and closing of the installation area by rotation without separation, so that the flow plate, purification plate, and impurity removal cotton can be replaced more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the sample loading tube and the connecting plate of the present invention;

[0030] Figure 3 It is a three-dimensional structural cross-sectional view of the sample loading tube of the present invention;

[0031] Figure 4 It is a front cross-sectional view of the sample tube of the present invention;

[0032] Figure 5 It is a three-dimensional structural cross-sectional view of the push plug, floating plug and floating sheet of the present invention;

[0033] Figure 6 An exploded view of the push plug, floating plug and floating sheet of the present invention;

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the connection disk of the present invention;

[0035] Figure 8 It is a three-dimensional structural cross-sectional view of the connection disk of the present invention;

[0036] Fig. 9 An exploded view of the sleeve and the support bowl of the present invention;

[0037] Fig.10 For the present invention Fig. 9 Enlarged view of point A in the middle.

[0038] In the figure: 1. chromatograph body; 2. injection port; 3. sample tube; 4. injection plug; 5. electric cylinder; 6. push plug; 7. air remover; 71. slide rod; 72. floating plug; 73. compression spring; 74. groove; 75. floating sheet; 76. connecting pipe; 77. inner hole; 78. plunger; 79. filter assembly; 791. connecting plate; 792. through hole; 793. side port; 794. slide groove; 795. slide rack; 796. spring cap; 797. slot; 798. sleeve; 799. flow plate; 7910. purification plate; 7911. impurity cotton; 7912. quick release assembly; 79121. incision; 79122. connecting rod; 79123. tray; 79124. magnetic ring. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical staff in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figures 1 to 10 The present invention provides a technical solution: a sampling device for gas chromatograph detection, comprising a chromatograph body 1, a sampling port 2 is arranged on the left side surface of the chromatograph body 1, and a sample tube 3 is fixedly installed at the sampling port 2, and an injection plug 4 is arranged on the side surface of the sample tube 3. Before detection, the sample is injected into the sample tube 3 along the injection plug 4, and an electric cylinder 5 is fixedly arranged at the bottom of the sample tube 3, the telescopic rod of the electric cylinder 5 penetrates into the sample tube 3, and a push plug 6 is fixedly connected to the telescopic end of the electric cylinder 5. When the electric cylinder 5 is started to control the push plug 6 to move upward, the sample can be pushed into the chromatograph body 1 along the sampling port 2 for detection.

[0041] The push plug 6 and the sample tube 3 are provided with a deduster 7 .

[0042] The air remover 7 includes a slide rod 71 movably inserted into the surface of the push plug 6, and the top of the slide rod 71 is fixedly connected to a floating plug 72, and the lower side of the slide rod 71 is movably sleeved with a compression spring 73, and the two ends of the compression spring 73 are connected to the push plug 6 and the slide rod 71, and the compression spring 73 pushes the slide rod 71 and the floating plug 72 to move upward.

[0043] A groove 74 is provided on the top surface of the floating plug 72, and a floating sheet 75 is movably provided in the groove 74. A connecting tube 76 is fixedly inserted through the surface of the floating sheet 75, and the connecting tube 76 is a hollow structure. After the sample enters the sample tube 3, it falls on the floating plug 72, and the floating sheet 75 moves upward due to the buoyancy and floats on the liquid surface, that is, the sample is located between the floating sheet 75 and the floating plug 72.

[0044] An inner hole 77 is provided inside the slide bar 71, and the upper end of the inner hole 77 is connected to the groove 74, and the lower end is connected to the outside. The connecting tube 76 is slidably connected in the inner hole 77, and the lower side of the inner hole 77 is fixedly connected to a plunger 78 through a bracket. The plunger 78 is inserted into the bottom end of the connecting tube 76. The connecting tube 76 moves upward along the inner hole 77, and the bottom end of the connecting tube 76 is separated from the plunger 78, so that the cavity above the sample liquid surface is connected with the cavity on the lower side of the push plug 6. At this time, the compression spring 73 pushes the slide bar 71 and the floating plug 72 to move upward to compress the cavity above the liquid surface until the top end of the connecting tube abuts against the sample tube 3 to disconnect.

[0045] A filter assembly 79 is provided between the sample loading tube 3 and the sample inlet 2 .

[0046] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the filter assembly 79 includes a connecting plate 791 arranged between the sample tube 3 and the sample inlet 2, and the connecting plate 791 is vertically provided with a through hole 792 connected to the sample tube 3 and the sample inlet 2, the side surface of the connecting plate 791 is provided with four side ports 793 connected to the through holes 792, and the top surface of the connecting plate 791 is provided with a slide groove 794 connected to the side ports 793, a slide 795 is slidably connected in the slide groove 794, and a spring cap 796 that moves up and down is provided on the top of the slide 795, and a slot 797 that matches the spring cap 796 is provided on the slide groove 794.

[0047] A sleeve 798 matching the through hole 792 is provided in the side opening 793, and the sleeve 798 is fixedly connected to the slide 795. The spring cap 796 is pulled up to unlock the slide 795, and then the slide 795 slides out of the slide groove 794, so that the sleeve 798 is separated from the side opening 793. The interior of the sleeve 798 is respectively provided with a flow disk 799, a purification disk 7910, and impurity removal cotton 7911. The apertures on the flow disks 799 in the four sleeves 798 are different to achieve different flow controls. The spring cap 796 is pulled up to disengage from the card slot 797, so that the slide 795 is unlocked. At this time, the slide 795 can move along the slide groove 794 and push the sleeve 798 to align with the through hole 792. According to the flow speed required for injection, different sleeves 798 and the flow disks 799 inside them are selected to control the injection.

[0048] A quick-release assembly 7912 is provided between the sleeve 798 and the flow disc 799 , the purification disc 7910 , and the impurity-removing cotton 7911 .

[0049] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10As shown, the quick-release assembly 7912 includes a cutout 79121 opened in the middle of the sleeve 798, and a connecting rod 79122 is fixedly arranged in the cutout 79121, three supporting bowls 79123 are movably arranged in the cutout 79121, and the supporting bowls 79123 are rotatably connected to the connecting rod 79122, and magnetic rings 79124 are fixedly arranged inside the three supporting bowls 79123, and the flow disk 799, the purification disk 7910, and the impurity-removing cotton 7911 are respectively arranged in the three supporting bowls 79123 and carried by the magnetic rings 79124. The supporting bowl 79123 is moved out of the cutout 79121 along the connecting rod 79122, and the operator can push up the flow disk 799, the purification disk 7910, and the impurity-removing cotton 7911 from the lower side of each magnetic ring 79124 to take them out.

[0050] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the inner top wall of the sample loading tube 3 is provided with an embedding hole matched with the top end of the connecting tube 76 , and the connecting tube can be inserted into the embedding hole for stable sealing, which has better sealing performance than abutting against the inner top wall of the sample loading tube 3 .

[0051] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the embedding hole and the top end of the connecting tube 76 are configured as mutually matching conical structures. When the top end of the connecting tube is slightly offset, the conical structure can ensure that it can still be stably inserted into the embedding hole.

[0052] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the surface of the spring cap 796 is provided with anti-skid grooves. When the operator pinches the spring cap 796, the anti-skid grooves can effectively increase the contact friction and avoid slipping.

[0053] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, positioning magnets are fixedly embedded on the top and bottom of the tray bowl 79123 , and the three tray bowls 79123 and the tray bowl 79123 and the cutout 79121 can be magnetically positioned by the positioning magnets, thereby facilitating the stable installation of the tray bowl 79123 along the cutout 79121 .

[0054] A method for operating a sample injection device for gas chromatograph detection comprises the following steps:

[0055] S1. Inject the sample into the sample tube 3 along the injection plug 4, start the electric cylinder 5 to control the push plug 6 to move upward, and then push the sample into the chromatograph body 1 along the injection port 2 for detection.

[0056] S2. After the sample enters the sample tube 3, it falls on the floating plug 72. The floating sheet 75 moves upward due to the buoyancy and floats on the liquid surface, that is, the sample is located between the floating sheet 75 and the floating plug 72. During this process, the connecting tube 76 moves upward along the inner hole 77 synchronously, and the bottom end of the connecting tube 76 is separated from the plunger 78, so that the cavity above the sample liquid surface is connected with the cavity on the lower side of the push plug 6. At this time, the compression spring 73 pushes the slide rod 71 and the floating plug 72 to move upward to compress the cavity above the liquid surface until the top end of the connecting tube abuts against the sample tube 3 to disconnect.

[0057] S3. Before operating the sample tube 3 to introduce the sample into the injection port 2, pull up the spring cap 796 to disengage the card slot 797, so that the slide 795 is unlocked. At this time, the slide 795 can move along the slide slot 794 and push the sleeve 798 to align with the through hole 792. In this way, according to the flow rate required for injection, different sleeves 798 and the flow disk 799 inside them are selected to control the injection.

[0058] S4. When the flow plate 799, purification plate 7910 and impurity removal cotton 7911 need to be removed, pull up the spring cap 796 to unlock the slide 795, and then slide the slide 795 out of the slide groove 794 to disengage the sleeve 798 from the side opening 793. At this time, push the support bowl 79123 along the connecting rod 79122 to rotate out of the incision 79121, and the operator can push up the flow plate 799, purification plate 7910 and impurity removal cotton 7911 from the lower side of each magnetic ring 79124 to take them out.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sampling device for gas chromatograph detection, comprising a chromatograph body (1), characterized in that: The left side surface of the chromatograph body (1) is provided with a sample inlet (2), and a sample tube (3) is fixedly installed at the sample inlet (2), an injection plug (4) is provided on the side surface of the sample tube (3), and an electric cylinder (5) is fixedly provided at the bottom of the sample tube (3), the telescopic rod of the electric cylinder (5) penetrates into the sample tube (3), and the telescopic end of the electric cylinder (5) is fixedly connected to a push plug (6); The push plug (6) and the sample loading tube (3) are provided with a degassing device (7); The deaerator (7) comprises a slide bar (71) movably inserted into the surface of the push plug (6), and the top end of the slide bar (71) is fixedly connected to a floating plug (72), and the lower side of the slide bar (71) is movably sleeved with a compression spring (73), and the two ends of the compression spring (73) are connected to the push plug (6) and the slide bar (71), and the compression spring (73) pushes the slide bar (71) and the floating plug (72) to move upward; The top surface of the floating plug (72) is provided with a groove (74), and a floating sheet (75) is movably arranged in the groove (74). A connecting tube (76) is fixedly inserted into the surface of the floating sheet (75), and the connecting tube (76) is provided as a hollow structure. An inner hole (77) is formed inside the slide bar (71), and the upper end of the inner hole (77) is connected to the groove (74), and the lower end is connected to the outside, the connecting pipe (76) is slidably connected in the inner hole (77), and a plunger (78) is fixedly connected to the lower side of the inner hole (77) through a bracket, and the plunger (78) is plugged into the bottom end of the connecting pipe (76); A filter assembly (79) is provided between the sample loading tube (3) and the sample inlet (2).

2. A sample injection device for gas chromatograph detection according to claim 1, characterized in that: The filter assembly (79) comprises a connection plate (791) arranged between the sample tube (3) and the sample inlet (2), and a through hole (792) communicating with the sample tube (3) and the sample inlet (2) is vertically provided on the connection plate (791), four side openings (793) communicating with the through holes (792) are provided on the side surface of the connection plate (791), and a slide groove (794) communicating with the side openings (793) is provided on the top surface of the connection plate (791), a slide frame (795) is slidably connected in the slide groove (794), and a spring cap (796) that moves up and down is provided on the top of the slide frame (795), and a clamping groove (797) that matches with the spring cap (796) is provided on the slide groove (794); A sleeve (798) matching with the through hole (792) is arranged in the side opening (793), and the sleeve (798) is fixedly connected to the slide (795), and a flow disc (799), a purification disc (7910), and impurity removal cotton (7911) are respectively arranged inside the sleeve (798); A quick-release assembly (7912) is provided between the sleeve (798), the flow disc (799), the purification disc (7910), and the impurity removal cotton (7911).

3. A sample injection device for gas chromatograph detection according to claim 2, characterized in that: The quick-release assembly (7912) comprises a cutout (79121) opened in the middle of the sleeve (798), and a connecting rod (79122) is fixedly arranged in the cutout (79121), three supporting bowls (79123) are movably arranged in the cutout (79121), and the supporting bowls (79123) are rotatably connected to the connecting rod (79122), and magnetic rings (79124) are fixedly arranged inside the three supporting bowls (79123), and the flow disc (799), the purification disc (7910), and the impurity removal cotton (7911) are respectively arranged in the three supporting bowls (79123) and supported by the magnetic rings (79124).

4. The sampling device for gas chromatograph detection according to claim 1, characterized in that: The inner top wall of the sample loading tube (3) is provided with an embedding hole which matches with the top end of the connecting tube (76).

5. A sample injection device for gas chromatograph detection according to claim 4, characterized in that: The top ends of the embedding hole and the connecting tube (76) are configured as mutually matching conical structures.

6. A sample injection device for gas chromatograph detection according to claim 2, characterized in that: The surface of the spring cap (796) is provided with anti-slip grooves.

7. The sampling device for gas chromatograph detection according to claim 3, characterized in that: Positioning magnetic sheets are fixedly embedded on the top and bottom of the tray (79123).

8. The method for operating a sample injection device for gas chromatograph detection according to claim 3, comprising the following steps: S1, inject the sample into the sample tube (3) along the injection plug (4), start the electric cylinder (5) to control the push plug (6) to move upward, and then push the sample into the chromatograph body (1) along the injection port (2) for detection; S2, after the sample enters the sample tube (3), it falls on the floating plug (72), and the floating sheet (75) moves upward due to the buoyancy and floats on the liquid surface, that is, the sample is located between the floating sheet (75) and the floating plug (72). During this process, the connecting tube (76) moves upward along the inner hole (77) synchronously, and the bottom end of the connecting tube (76) is separated from the plunger (78), so that the cavity above the sample liquid surface is connected with the cavity under the push plug (6). At this time, the compression spring (73) pushes the slide bar (71) and the floating plug (72) to move upward to compress the cavity above the liquid surface until the top end of the connecting tube abuts against the sample tube (3) to disconnect the connection; S3. Before operating the sample tube (3) to introduce the sample into the injection port (2), pull up the spring cap (796) to disengage the card slot (797), so that the slide (795) is unlocked. At this time, the slide (795) can move along the slide slot (794) and push the sleeve (798) to align with the through hole (792). In this way, according to the flow rate required for injection, different sleeves (798) and the flow disc (799) inside are selected to control the injection; S4. When it is necessary to remove the flow plate (799), the purification plate (7910), and the impurity removal cotton (7911), pull up the spring cap (796) to unlock the slide (795), and then slide the slide (795) out of the slide groove (794), so that the sleeve (798) is disengaged from the side opening (793). At this time, the supporting bowl (79123) is moved along the connecting rod (79122) to rotate out of the cutout (79121), and the operator can push up the flow plate (799), the purification plate (7910), and the impurity removal cotton (7911) from the lower side of each magnetic ring (79124) to remove them.

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