Solid Phase Microextractor

Abstract

The present invention discloses a solid-phase microextractor, comprising a base, an outer tube assembly, an inner tube assembly and a pushing assembly. The pushing assembly comprises a push rod, a moving block and a limiting member. During installation, the push rod, the moving block and the limiting member can be assembled in sequence first, and then the push rod and the moving block can be installed on the base using the limiting member, which makes installation more convenient. The limiting member can prevent the moving block from sliding out of the chamber of the base during movement. A reset member is provided on the side of the moving block close to the inner tube body. The reset member can be used to reset the inner tube body through the restoring force of the reset member when the inner tube body is pressed and the sampling work is completed, without manual re-operation, which makes it more convenient to use. The limiting member can be detachably connected to the other end of the base. When the reset member needs to be replaced or disassembled, the reset member can be easily taken out by removing the limiting member, which is also conducive to improving the assemblability of the solid-phase microextractor as a whole.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-phase sample analysis, in particular to a solid-phase microextractor. Background Art

[0002] Solid-Phase Extraction (SPE) is a recently developed sample pretreatment technique, developed by combining liquid-solid extraction columns with liquid chromatography. It is primarily used for sample separation, purification, and concentration. Compared with traditional liquid-liquid extraction, it can improve analyte recovery, more effectively separate analytes from interfering components, and reduce sample pretreatment. It is simple to operate, saving time and effort. It is widely used in the fields of medicine, food, environment, commodity inspection, and chemical industry.

[0003] During solid-phase extraction, a solid-phase microextractor is usually used. The solid-phase microextractor in the prior art mainly uses the up and down push of the handle to drive the extraction needle to move. When the extraction needle needs to be positioned, the position of the handle is manually controlled or a complex structure is used to fix the extraction needle, which is inconvenient to use. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problem that the solid phase microextractor in the prior art is inconvenient to use.

[0005] To solve the above technical problems, an embodiment of the present invention discloses a solid phase microextractor, comprising:

[0006] A substrate, wherein a cavity is formed inside the substrate and extends along the length direction of the substrate and communicates with the outside;

[0007] The outer tube assembly includes an outer tube body and a positioning component. The positioning component is detachably connected to one end of the base body, and the outer tube body is fixedly connected to the positioning component. One end of the outer tube body is located outside the cavity, and the other end passes through the positioning component and extends into the cavity.

[0008] An inner tube assembly, comprising an inner tube body, the inner tube body being disposed in the chamber, and at least a portion of the inner tube body being slidably sleeved in the outer tube body along a length direction of the outer tube body;

[0009] The pushing assembly includes a push rod, a moving block and a limiting member. The moving block is slidably connected to one end of the inner tube body away from the outer tube body in the chamber. The limiting member is detachably connected to the other end of the base body, and the limiting member has a through hole for the push rod. One end of the push rod is located outside the chamber, and the other end extends through the through hole into the chamber and is fixedly connected to the moving block; and

[0010] A reset member is provided on one side of the moving block close to the inner tube body, one end of the reset member abuts against the positioning component, and the other end abuts against the moving block; wherein,

[0011] When the push rod pushes the moving block to approach the outer tube body along the length direction of the chamber, the reset component has a restoring force to push the moving block away from the outer tube body.

[0012] By adopting the above-mentioned technical solution, the pushing assembly for linking the movement of the inner tube assembly in the solid-phase microextractor provided in this embodiment includes a push rod, a moving block and a limiting component. During installation, the push rod, the moving block and the limiting component can be assembled in sequence first, and then the push rod and the moving block can be installed on the base using the limiting component, which makes installation more convenient. The use of the limiting component can prevent the moving block from slipping out of the cavity of the base during movement, and its stability is better.

[0013] In addition, a reset component is provided on the side of the moving block close to the inner tube body. When the inner tube body is pressed and the sampling work is completed, the reset component can automatically link the moving block and drive the inner tube body to reset through the restoring force of the reset component, without the need for manual operation again, and it is more convenient to use.

[0014] In addition, since the limiting member is detachably connected to the other end of the base, when the reset member needs to be replaced or removed, the reset member can be easily taken out by removing the limiting member, which is beneficial to improving the overall assemblability of the solid phase microextractor.

[0015] Therefore, the solid phase microextractor provided in this embodiment can further improve the working stability and assemblability of the solid phase microextractor on the basis of improving the convenience of use.

[0016] According to another embodiment of the present invention, a solid-phase microextractor is provided, wherein a guide groove extending along the length direction of the substrate is formed on the side wall of the substrate, and a plurality of positioning grooves extending along the circumference of the substrate are formed on the side wall of the substrate, wherein the plurality of positioning grooves are connected to the guide groove and are spaced apart along the length direction of the substrate; and the guide groove and the positioning groove both penetrate the side wall of the substrate in the radial direction of the substrate; and

[0017] The moving block is fixedly connected with a clamping portion, and at least a portion of the clamping portion is selectively slidably connected to the guide groove or clamped to the positioning groove.

[0018] The above technical solution provides a smoother movement of the clamping portion by providing a guide groove. Positioning grooves are formed on the sides of the guide grooves. This allows the user to manipulate the clamping portion to engage within the corresponding positioning grooves when the inner tube body is moved to a desired position, thereby achieving positioning. In this structure, since the positioning grooves extend circumferentially along the sidewalls of the base, the positioning grooves can exert a significant limiting force on the clamping portion without requiring additional components, further enhancing the operational stability of the solid-phase microextractor.

[0019] According to another embodiment of the present invention, the solid phase microextractor is provided, wherein the plurality of positioning grooves are staggered and distributed in sequence on both sides of the guide groove along the length direction of the base relative to the guide groove.

[0020] By adopting the above technical solution, by staggering the plurality of positioning grooves relative to the guide groove on both sides of the guide groove along the length direction of the base body, the user can conveniently position the engaging portion in both directions. In addition, the staggered distribution method can also avoid the situation where multiple positioning grooves are concentrated on the same side of the guide groove, which would affect the structural strength of the base body.

[0021] According to another embodiment of the present invention, the solid phase microextractor provided, the clamping portion includes a screw threadedly connected to the outer wall surface of the moving block.

[0022] With the above technical solution, since the screw can be rotated to adjust its height, when in use, even if the clamping portion is located in the guide groove, the user can still position the clamping portion by tightening the screw. In other words, the solution provided by this embodiment can achieve positioning of the inner tube body at any position.

[0023] According to another embodiment of the present invention, in the solid phase microextractor, the reset member is configured as a coil spring, and the outer diameter of the coil spring is smaller than the inner diameter of the other end of the chamber.

[0024] According to another embodiment of the present invention, the solid phase microextractor is provided, and the moving block is configured as a stepped structure, and the large diameter end of the stepped structure is located close to the inner tube body, and the small diameter end of the stepped structure is located close to the push rod and is threadedly connected to the push rod.

[0025] By adopting the above technical solution, by setting the moving block as a stepped structure, when in use, only the large diameter end of the moving block contacts the inner wall of the chamber, which has the advantages of small contact area and small friction, and is conducive to reducing the damping of the moving block during movement.

[0026] According to another embodiment of the present invention, a solid phase microextractor is provided, wherein a countersunk hole is formed at the large diameter end of the stepped structure, and an end of the inner tube body away from the outer tube body is embedded in the countersunk hole;

[0027] An external thread is formed on the small-diameter end of the step structure, a threaded hole is formed on one end of the push rod located in the chamber, and the moving block is connected to the threaded hole of the push rod through the external thread.

[0028] By adopting the above technical solution, by forming a countersunk hole at the large diameter end of the stepped structure, the end of the inner tube body can be always embedded in the countersunk hole, which can prevent the inner tube body from deflecting and affecting the overall working performance of the solid phase microextractor.

[0029] According to another embodiment of the present invention, the solid phase microextractor provided, the limiting member includes a rear end cover, and the rear end cover is snap-connected or threadedly connected to the other end of the base.

[0030] According to another embodiment of the present invention, the solid phase microextractor provided, the positioning component includes a front end cover and a positioning block; wherein,

[0031] The positioning block is at least partially disposed in the chamber and is threadedly connected relative to the inner wall surface of the chamber;

[0032] The front end cover is detachably mounted on one end of the base body; and

[0033] The front end cover and the positioning block are both provided with mutually communicating passages, and the portion of the outer tube body that passes through the positioning component is fixedly arranged in the passage.

[0034] According to another embodiment of the present invention, the solid phase microextractor provided has a base configured as a cylindrical structure, and an outer wall surface of the base is provided with scales distributed along the length direction of the base.

[0035] The beneficial effects of the present invention are:

[0036] A solid-phase microextractor is provided, comprising a base, an outer tube assembly, an inner tube assembly, and a pushing assembly. The pushing assembly comprises a push rod, a moving block, and a limiting member. During installation, the push rod, the moving block, and the limiting member can be assembled in sequence first, and then the push rod and the moving block can be mounted on the base using the limiting member, making installation more convenient. The limiting member can also prevent the moving block from sliding out of the chamber of the base during movement, thus improving its stability. A reset member is provided on the side of the moving block close to the inner tube body. The reset member can automatically link the moving block and drive the inner tube body to reset when the inner tube body is pressed and the sampling work is completed, without the need for manual re-operation, making it more convenient to use. Furthermore, since the limiting member is detachably connected to the other end of the base, when the reset member needs to be replaced or disassembled, the reset member can be easily taken out by removing the limiting member, which is conducive to improving the overall assemblability of the solid-phase microextractor.

[0037] Therefore, the solid phase microextractor provided by the present invention can further improve the working stability and assemblability of the solid phase microextractor on the basis of improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a partial cross-sectional structure of a solid phase microextractor provided in an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the three-dimensional structure of a solid phase microextractor provided in an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the partial three-dimensional structure of a solid-phase microextractor provided in an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 100, matrix;

[0043] 110, chamber; 120, guide groove; 130, positioning groove;

[0044] 200, outer tube assembly;

[0045] 210, outer tube body;

[0046] 220, positioning components;

[0047] 221, front end cover; 222, positioning block;

[0048] 300, inner tube assembly;

[0049] 310. Inner tube body;

[0050] 400, push component;

[0051] 410, Putting;

[0052] 411, threaded hole;

[0053] 420, moving blocks;

[0054] 421, countersunk hole; 422, external thread;

[0055] 430, limiting member;

[0056] 440, reset member;

[0057] 450. Snap-fit ​​portion. DETAILED DESCRIPTION

[0058] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0059] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0060] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0061] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0062] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0063] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0064] The embodiment of the present invention discloses a solid phase microextractor, such as Figure 1 and Figure 2 As shown, it includes a base 100 , an outer tube assembly 200 , an inner tube assembly 300 and a pushing assembly 400 .

[0065] Specifically, in this embodiment, a chamber 110 is formed inside the base 100, extending along the length direction of the base 100 and communicating with the outside; the outer tube assembly 200 includes an outer tube body 210 and a positioning component 220, the positioning component 220 is detachably connected to one end of the base 100, and the outer tube body 210 is fixedly connected to the positioning component 220, and one end of the outer tube body 210 is located outside the chamber 110, and the other end passes through the positioning component 220 and extends into the chamber 110; the inner tube assembly 300 includes an inner tube body 310, which is disposed in the chamber 110. And the inner tube body 310 is at least partially slidably sleeved in the outer tube body 210 along the length direction of the outer tube body 210; the pushing assembly 400 includes a push rod 410, a moving block 420 and a limiting member 430, the moving block 420 is slidably connected to the chamber 110 and is located at one end of the inner tube body 310 away from the outer tube body 210, the limiting member 430 is detachably connected to the other end of the base 100, and the limiting member 430 has a through hole for the push rod 410, one end of the push rod 410 is located outside the chamber 110, and the other end extends through the through hole into the chamber 110 and is fixedly connected to the moving block 420.

[0066] Furthermore, in this embodiment, a reset member 440 is provided on one side of the moving block 420 close to the inner tube body 310 . One end of the reset member 440 abuts against the positioning component 220 , and the other end abuts against the moving block 420 .

[0067] During use, when the push rod 410 pushes the moving block 420 toward the outer tube body 210 along the length direction of the chamber 110 , the restoring member 440 has a restoring force that pushes the moving block 420 away from the outer tube body 210 .

[0068] Based on the above structure, it can be seen that the pushing assembly 400 for linking the movement of the inner tube assembly 300 in the solid-phase microextractor provided in this embodiment includes a push rod 410, a moving block 420 and a limiting member 430. During installation, the push rod 410, the moving block 420 and the limiting member 430 can be assembled in sequence first, and then the push rod 410 and the moving block 420 can be installed on the base 100 using the limiting member 430, which makes installation more convenient; and the use of the limiting member 430 can prevent the moving block 420 from sliding out of the chamber 110 of the base 100 during movement, and its stability is better.

[0069] Furthermore, a reset member 440 is provided on one side of the moving block 420 close to the inner tube body 310. The reset member 440 can automatically link the moving block 420 and drive the inner tube body 310 to reset when the inner tube body 310 is pressed and the sampling work is completed through the restoring force of the reset member 440, without the need for manual operation again, and it is more convenient to use.

[0070] Furthermore, since the limiting member 430 is detachably connected to the other end of the base 100, when the reset member 440 needs to be replaced or removed, the limiting member 430 can be removed to conveniently take out the reset member 440, which is beneficial to improving the overall assemblability of the solid phase microextractor.

[0071] Therefore, the solid phase microextractor provided in this embodiment can further improve the working stability and assemblability of the solid phase microextractor on the basis of improving the convenience of use.

[0072] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 2 and Figure 3 As shown, a guide groove 120 extending along the length direction of the base 100 is formed on the side wall of the base 100, and a plurality of positioning grooves 130 extending along the circumference of the base 100 are formed on the side wall of the base 100. Figure 3 As shown, this embodiment is illustrated with five positioning grooves 130, and the five positioning grooves 130 are all connected to the guide groove 120 and are spaced apart along the length direction of the base 100; and the guide groove 120 and the positioning groove 130 both pass through the side wall of the base 100 in the radial direction of the base 100; a clamping portion 450 is fixedly connected to the moving block 420, and the clamping portion 450 is at least partially selectively slidably connected to the guide groove 120 or clamped to the positioning groove 130, and the part of the clamping portion 450 located in the guide groove 120 can be slidably connected to the guide groove 120 when the moving block 420 moves, and when the inner tube body 310 moves to the desired position and the moving block 420 needs to be fixed, the part of the clamping portion 450 located in the positioning groove 130 is clamped to the positioning groove 130.

[0073] Specifically, in this embodiment, the guide groove 120 is provided to make the clamping portion 450 more stable during movement, and the positioning groove 130 is formed on the side of the guide groove 120. In this way, when the inner tube body 310 is moved to the desired position, the user can operate the clamping portion 450 to make it clamped in the corresponding positioning groove 130, thereby realizing the positioning groove 130. In this structure, because the positioning groove 130 extends along the circumference of the side wall of the base 100, it is possible to achieve that the positioning groove 130 can apply a large limiting force to the clamping portion 450 without the need for additional components, which is conducive to further improving the operating stability of the solid-phase microextractor.

[0074] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 3 As shown, the five positioning grooves 130 are staggered and distributed in sequence on both sides of the guide groove 120 along the length direction of the base 100 relative to the guide groove 120 .

[0075] Specifically, in this embodiment, the five positioning grooves 130 are staggered relative to the guide groove 120 on both sides of the guide groove 120 along the length of the base 100, making it easier for the user to position the engaging portion 450 in both directions. Furthermore, the staggered distribution prevents the five positioning grooves 130 from being concentrated on the same side of the guide groove 120, thereby reducing the structural strength of the base 100.

[0076] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, the clamping portion 450 includes a screw threadedly connected to the outer wall surface of the moving block 420 .

[0077] Specifically, in this embodiment, since the height of the screw can be adjusted by rotation, when in use, even if the clamping portion 450 is located in the guide groove 120, the user can still position the clamping portion 450 by tightening the screw. In other words, the solution provided by this embodiment can achieve positioning of the inner tube body 310 at any position.

[0078] Furthermore, in a solid phase microextractor provided in another preferred embodiment of the present invention, the reset member 440 is configured as a coil spring, and the outer diameter of the coil spring is smaller than the inner diameter of the other end of the chamber 110 .

[0079] Preferably, in this embodiment, the outer diameter of the coil spring can be set to 6.5 mm, the length is set to 38 mm, the effective number of turns is set to 15, the material diameter of the spring is set to 0.3 mm, the inner diameter of the chamber 110 is set to 6.5 mm, and the outer diameter of the push rod 410 is set to 6.3 mm.

[0080] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 1 As shown, the moving block 420 is configured as a stepped structure, and the large diameter end of the stepped structure is located near the inner tube body 310 , and the small diameter end of the stepped structure is located near the push rod 410 and is threadedly connected to the push rod 410 .

[0081] Specifically, in this embodiment, by setting the moving block 420 as a stepped structure, when in use, only the large diameter end of the moving block 420 contacts the inner wall of the chamber 110, which has the advantages of small contact area and small friction, and is conducive to reducing the damping of the moving block 420 during movement.

[0082] It should be noted that, in this embodiment, the outer diameter of the large-diameter end of the moving block 420 is preferably set to 5.6 mm, and no requirement is imposed on the small-diameter end.

[0083] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 1As shown, a countersunk hole 421 is formed at the large-diameter end of the stepped structure, and one end of the inner tube body 310 away from the outer tube body 210 is embedded in the countersunk hole 421 .

[0084] Furthermore, an external thread 422 is formed on the small diameter end of the stepped structure, a threaded hole 411 is formed on one end of the push rod 410 located in the chamber 110 , and the moving block 420 is connected to the threaded hole 411 of the push rod 410 via the external thread 422 .

[0085] Specifically, in this embodiment, by forming a countersunk hole 421 at the large diameter end of the stepped structure, the end of the inner tube body 310 can always be embedded in the countersunk hole 421, which can prevent the inner tube body 310 from deflecting and affecting the overall working performance of the solid phase microextractor.

[0086] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 2 and Figure 3 As shown, the limiting member 430 includes a rear end cover, which is snap-fitted or threadedly connected to the other end of the base 100 .

[0087] Specifically, in this embodiment, the rear end cover can be snapped onto the other end of the base 100 or can be threadedly connected to the other end of the base 100. The specific setting can be based on actual requirements and is not required in this embodiment.

[0088] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 1 As shown, the positioning component 220 includes a front end cover 221 and a positioning block 222 .

[0089] Specifically, in this embodiment, the positioning block 222 is at least partially disposed in the chamber 110. For example, half of the positioning block 222 in its length direction is disposed in the chamber 110 and is threadedly connected relative to the inner wall surface of the chamber 110. The front end cover 221 is detachably covered on the outside of one end of the base 100.

[0090] Furthermore, the front end cover 221 and the positioning block 222 are both provided with mutually communicating channels, and the portion of the outer tube body 210 that passes through the positioning component 220 is fixedly disposed in the channel.

[0091] Furthermore, in the solid phase microextractor provided in another preferred embodiment of the present invention, Figure 1-Figure 3 As shown, the base 100 is configured as a cylindrical structure, and scales distributed along the length direction of the base 100 are provided on the outer wall surface of the base 100 .

[0092] Specifically, in this embodiment, the scale may be drawn on the outer wall surface of the base 100 or may be engraved on the outer wall surface of the base 100 .

[0093] The present invention discloses a solid phase microextractor, such as Figure 1-Figure 3 As shown, the push assembly 400 includes a base 100, an outer tube assembly 200, an inner tube assembly 300, and a push assembly 400. The push assembly 400 includes a push rod 410, a moving block 420, and a limiting member 430. During installation, the push rod 410, the moving block 420, and the limiting member 430 can be assembled in sequence first, and then the push rod 410 and the moving block 420 can be installed on the base 100 using the limiting member 430, which makes installation more convenient. The limiting member 430 can also prevent the moving block 420 from sliding out of the cavity 110 of the base 100 during movement, thereby improving stability. A reset member 440 is provided on the side of the movable block 420 near the inner tube body 310. This reset member 440 automatically engages the movable block 420 and resets the inner tube body 310 when the inner tube body 310 is pressed and sampling is complete, eliminating the need for manual operation and enhancing ease of use. Furthermore, because the limiting member 430 is detachably connected to the other end of the base 100, the reset member 440 can be easily removed by removing the limiting member 430 when replacement or removal is necessary, improving the overall assemblability of the solid-phase microextractor.

[0094] Therefore, the solid phase microextractor provided by the present invention can further improve the working stability and assemblability of the solid phase microextractor on the basis of improving the convenience of use.

[0095] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A solid phase microextractor, characterized in that include: a substrate, wherein a cavity is formed inside the substrate and extends along the length direction of the substrate and communicates with the outside; an outer tube assembly, the outer tube assembly comprising an outer tube body and a positioning component, the positioning component being detachably connected to one end of the base, the outer tube body being fixedly connected to the positioning component, one end of the outer tube body being located outside the cavity, and the other end penetrating the positioning component and extending into the cavity; An inner tube assembly, the inner tube assembly comprising an inner tube body, the inner tube body being disposed in the chamber and at least partially slidably sleeved within the outer tube body along a length direction of the outer tube body; A pushing assembly, the pushing assembly comprising a push rod, a moving block and a limiting member, the moving block being slidably connected to one end of the inner tube body located in the chamber away from the outer tube body, the limiting member being detachably connected to the other end of the base, and the limiting member having a through hole for the push rod, one end of the push rod being located outside the chamber, and the other end extending through the through hole into the chamber and fixedly connected to the moving block; and A reset member is provided on one side of the moving block close to the inner tube body, one end of the reset member abuts against the positioning component, and the other end abuts against the moving block; wherein, When the push rod pushes the moving block toward the outer tube body along the length direction of the chamber, the reset member has a restoring force that pushes the moving block away from the outer tube body; a guide groove extending along the length direction of the base is formed on the side wall of the base, and a plurality of positioning grooves extending along the circumference of the base are formed on the side wall of the base, and the plurality of positioning grooves are connected to the guide groove and are spaced apart along the length direction of the base; and the guide groove and the positioning groove both penetrate the side wall of the base in the radial direction of the base; and, The movable block is fixedly connected with a clamping portion, and at least a portion of the clamping portion is selectively slidably connected to the guide groove or clamped to the positioning groove; The moving block is configured as a stepped structure, wherein a large-diameter end of the stepped structure is located close to the inner tube body, and a small-diameter end of the stepped structure is located close to the push rod and is threadedly connected to the push rod; A countersunk hole is formed at the large-diameter end of the stepped structure, and one end of the inner tube body away from the outer tube body is embedded in the countersunk hole.

2. The solid phase microextractor according to claim 1, wherein The plurality of positioning grooves are staggered and distributed in sequence on both sides of the guide groove relative to the guide groove along the length direction of the base.

3. The solid phase microextractor according to claim 1, wherein The clamping portion includes a screw threadedly connected to the outer wall surface of the moving block.

4. The solid phase microextractor according to claim 1, wherein The reset member is configured as a coil spring, and an outer diameter of the coil spring is smaller than an inner diameter of the other end of the chamber.

5. The solid phase microextractor according to claim 1, wherein An external thread is formed on the small-diameter end of the stepped structure, a threaded hole is formed on one end of the push rod located in the chamber, and the moving block is connected to the threaded hole of the push rod through the external thread.

6. The solid phase microextractor according to claim 1, wherein The limiting component includes a rear end cover, and the rear end cover is snap-connected or threadedly connected to the other end of the base.

7. The solid phase microextractor according to any one of claims 1 to 6, wherein The positioning component includes a front end cover and a positioning block; wherein, The positioning block is at least partially disposed in the chamber and is threadedly connected relative to the inner wall surface of the chamber; The front end cover is detachably mounted on one end of the base; and The front end cover and the positioning block are both provided with mutually communicating passages, and the portion of the outer tube body that passes through the positioning component is fixedly arranged in the passages.

8. The solid phase microextractor according to any one of claims 1 to 6, wherein The base is configured as a cylindrical structure, and scales distributed along the length direction of the base are provided on the outer wall surface of the base.

Images