Extraction head switching device and extraction head switching method

Abstract

The present invention relates to an extraction head switching device, comprising: a motion mechanism, the motion mechanism comprising a frame and a motion component, the motion component is mounted on the frame, and a picking portion is provided on the motion component; a first tray and a second tray, the first tray and the second tray are installed on the frame at intervals, the first tray is used to place the extraction head, and the second tray is used to place the injection piece; a switching component, the picking portion can be used to switchably pick up the switching component and the injection piece, the motion component is used to drive the switching component to grab the extraction head on the first tray to the second tray, and the motion component is also used to drive the picking portion to pick up the injection piece equipped with the extraction head on the second tray. The extraction head switching device can automatically select and switch the extraction head, is simple to operate, and is conducive to improving the automation and intelligence of the detection process.

Description

Technical Field

[0001] The present invention relates to the technical field of solid phase microextraction, and in particular to an extraction head switching device and an extraction head switching method. Background Art

[0002] With the development of solid-phase extraction technology, solid-phase microextraction (SPME) technology has emerged. SPME is a new solvent-free sample microextraction technology that integrates sampling, extraction, concentration and injection. Compared with solid-phase extraction technology, SPME is simpler to operate, more convenient to carry, and has lower operating costs.

[0003] The traditional SPME extraction device looks like a microinjection needle, which consists of a handle and an extraction head to complete the extraction and injection work. The handle part functions like a syringe, with a movable push rod; the extraction head is a stainless steel needle, with a slender telescopic rod inside the needle, and a fused quartz fiber is connected to the telescopic rod, and the surface is coated with a polymer adsorption material. The telescopic rod can be extended and retracted in the stainless steel needle with the push rod, and the front adsorption material is adsorbed and extracted. When performing SPME extraction analysis, it is necessary to select a suitable extraction head according to the extraction object.

[0004] The SPME extraction device in the prior art cannot realize automatic replacement of the SPME extraction head, and the manual switching method is complicated to operate, which is not conducive to the automation and intelligence of the detection process. Summary of the invention

[0005] Based on this, it is necessary to provide an extraction head switching device and an extraction head switching method, which can effectively realize the automatic switching of SPME extraction heads, are simple to operate, and are conducive to the automation and intelligence of the detection process.

[0006] An extraction head switching device comprises: a motion mechanism, the motion mechanism comprises a frame and a motion component, the motion component is movably mounted on the frame, and a picking portion is provided on the motion component; a first tray and a second tray, the first tray and the second tray are installed on the frame at an interval, the motion component can move back and forth between the first tray and the second tray, the first tray is used to place the extraction head, and the second tray is used to place the sample injection piece; a switching component, the picking portion can be used to switchably pick up the switching component and the sample injection piece, the motion component is used to drive the switching component to grab the extraction head on the first tray to the second tray, and the motion component is also used to drive the picking portion to pick up the sample injection piece equipped with the extraction head on the second tray.

[0007] In the installation process of the extraction head switching device, the motion component is first installed on the frame; then the first tray and the second tray are installed on the frame. During use, different types of extraction heads are placed on the first tray; and then the sample injection part is placed on the second tray. In this way, after the extraction head switching device is started, the motion component can move on the frame. When the extraction head switching operation is required, the motion component first drives the pickup part to pick up the switching component; then the motion component drives the switching component to move to the first tray, and drives the switching component to grab the extraction head on the first tray to the sample injection part on the second tray, so that the extraction head is loaded into the sample injection part; then, the motion component drives the pickup part to release the switching component; then the motion component drives the pickup part to pick up the sample injection part with the extraction head on the second tray to perform solid phase microextraction operation. The extraction head switching device can automatically select and switch the extraction head. When analyzing multiple types of samples or a large number of samples continuously, there is no need to stop the machine to manually replace the extraction head, and the extraction heads between different extraction devices can be freely switched. The operation is simple, which is conducive to improving the automation and intelligence of the detection process. At the same time, it can also reduce or even avoid errors in manual switching of extraction heads that may lead to deviations in experimental results, thereby improving the reliability of experimental results.

[0008] In one embodiment, the moving assembly includes a driving member and a moving arm, the moving arm is mounted on the frame through the driving member, the picking part is arranged on the moving arm, the driving member drives the moving arm to move along a first direction, and the moving arm drives the picking part to move along a second direction, and the first direction intersects with the second direction.

[0009] In one embodiment, a hanging hole is provided on the first tray, and the hanging hole is used for the extraction head to pass through and allow the extraction head to be hung on the first tray.

[0010] In one embodiment, there are more than two hanging holes, and the more than two hanging holes are arranged at intervals along the length direction of the first tray.

[0011] In one of the embodiments, a protrusion is provided between two adjacent hanging holes, and a cross-sectional area S of the protrusion decreases from an end of the protrusion close to the first tray to an end of the protrusion away from the first tray.

[0012] In one embodiment, the switching assembly includes a switching body and a gripper structure, wherein the gripper structure is mounted on the switching body, the switching body is detachably connected to the picking portion, and the gripper structure is used to grab and place the extraction head.

[0013] In one embodiment, the gripper structure includes a gripper and a transmission member, wherein the transmission member and the gripper are both mounted on the switching body, and the gripper moves away from or toward the transmission member. When the gripper is in contact with the transmission member, the gripper is in an open state, and when the gripper is out of contact with the transmission member, the gripper is in a closed state. The gripper is used to grasp and place the extraction head.

[0014] In one of the embodiments, a connecting portion is provided on the switching body, and the connecting portion is detachably connected to the picking portion.

[0015] A method for switching an extraction head, using the above extraction head switching device, comprises the following steps:

[0016] Start the motion component to drive the picking part to pick up the switching component;

[0017] The moving component drives the switching component to move to the first tray position, and the switching component grabs the extraction head on the first tray;

[0018] After grabbing, the switching assembly is moved to the second tray position by the moving assembly, and the extraction head is loaded onto the sample injection part;

[0019] After loading, the switching assembly is moved away from the second tray and the switching assembly is released;

[0020] After release, the picking-up part is moved to the second tray position by the moving assembly, and the picking-up part picks up the sample injection part equipped with the extraction head to perform subsequent solid phase microextraction operations.

[0021] In the above extraction head switching method, during the installation process, the motion component is first installed on the rack; then the first tray and the second tray are installed on the rack. During use, different types of extraction heads are placed on the first tray; and then the sample injection part is placed on the second tray. In this way, after the extraction head switching device is started, the motion component can move on the rack. When the extraction head switching operation is required, the motion component first drives the pickup part to pick up the switching component; then the motion component drives the switching component to move to the first tray, and drives the switching component to grab the extraction head on the first tray to the sample injection part on the second tray, so that the extraction head is loaded into the sample injection part; then, the motion component drives the pickup part to release the switching component; then the motion component drives the pickup part to pick up the sample injection part with the extraction head on the second tray to perform solid phase microextraction operation. The extraction head switching device can automatically select and switch the extraction head. When analyzing multiple types of samples or a large number of samples continuously, there is no need to stop the machine to manually replace the extraction head, and the extraction head between different extraction devices can be freely switched. The operation is simple, which is conducive to improving the automation and intelligence of the detection process. At the same time, it can also reduce or even avoid errors in manual switching of extraction heads that may lead to deviations in experimental results, thereby improving the reliability of experimental results.

[0022] In one embodiment, the step of starting the motion component to drive the picking part to pick up the switching component includes:

[0023] Starting the driving member, and driving the moving arm to move along the first direction through the driving member, so that the picking portion is located above the switching assembly;

[0024] The moving arm is started, and the picking portion is driven to move along the second direction by the moving arm, so that the picking portion contacts the switching component and the connection is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a schematic structural diagram of an extraction head switching device described in an embodiment;

[0028] Figure 2 is a schematic structural diagram of a first tray described in an embodiment;

[0029] Figure 3 is a schematic diagram of the structure of a switching component described in an embodiment;

[0030] Figure 4 The extraction head switching method described in one embodiment is as follows Figure 1 ;

[0031] Figure 5 The extraction head switching method described in one embodiment is as follows Figure 2 .

[0032] Description of reference numerals:

[0033] 100. Extraction head switching device, 110. Moving mechanism, 111. Frame, 112. Moving assembly, 1121. Driving member, 1122. Moving arm, 113. Picking portion, 120. First tray, 121. Extraction head, 122. Hanging hole, 123. Protrusion, 124. Clamp-shaped fixing seat, 130. Second tray, 131. Sample injection member, 140. Switching assembly, 141. Switching body, 1411. Connecting portion, 142. Gripper structure, 1421. Gripper, 1422. Transmission member. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] In one embodiment, see Figures 1 to 3, an extraction head switching device 100, comprising: a motion mechanism 110, a first tray 120, a second tray 130 and a switching assembly 140. The motion mechanism 110 comprises a frame 111 and a motion assembly 112, the motion assembly 112 is movably mounted on the frame 111, and a picking portion 113 is provided on the motion assembly 112. The first tray 120 and the second tray 130 are spaced apart and mounted on the frame 111, and the motion assembly 112 can move back and forth between the first tray 120 and the second tray 130, the first tray 120 is used to place the extraction head 121, and the second tray 130 is used to place the sample injection part 131. The picking portion 113 can be used to switchably pick up the switching component 140 and the sample injection piece 131, the motion component 112 is used to drive the switching component 140 to grab the extraction head 121 on the first tray 120 to the second tray 130, and the motion component 112 is also used to drive the picking portion 113 to pick up the sample injection piece 131 equipped with the extraction head 121 on the second tray 130.

[0041] During the installation of the extraction head switching device 100, the moving assembly 112 is first installed on the frame 111, and then the first tray 120 and the second tray 130 are installed on the frame 111. During use, different types of extraction heads 121 are placed on the first tray 120, and then the sample injection part 131 is placed on the second tray 130. In this way, after the extraction head switching device 100 is started, the moving assembly 112 can move on the frame 111. When the extraction head 121 needs to be switched, first the motion component 112 drives the picking part 113 to pick up the switching component 140; then the motion component 112 drives the switching component 140 to move to the first tray 120, and drives the switching component 140 to grab the extraction head 121 on the first tray 120 to the sample injection part 131 on the second tray 130, so that the extraction head 121 is loaded into the sample injection part 131; then, the motion component 112 drives the picking part 113 to release the switching component 140; then the motion component 112 drives the picking part 113 to pick up the sample injection part 131 on the second tray 130 with the extraction head 121, and performs the solid phase microextraction operation. The extraction head switching device 100 can automatically select and switch the extraction head 121. When analyzing multiple types of samples or continuously analyzing a large number of samples, there is no need to stop the machine to manually replace the extraction head 121, and the extraction head 121 between different extraction devices can be freely switched. The operation is simple, which is conducive to improving the automation and intelligence of the detection process. At the same time, it can also reduce or even avoid errors in manual switching of extraction heads that may lead to deviations in experimental results, thereby improving the reliability of experimental results.

[0042] Specifically, the motion component 112 is movably connected to the frame 111 via a guide rail. In this way, the motion component 112 can move regularly along the guide rail on the frame 111, which is beneficial to improving the motion stability of the motion component 112, facilitating the real-time acquisition of the real-time position coordinates of the motion component 112, and effectively ensuring the motion accuracy of the motion component 112 under program control, thereby improving the automation of the extraction head switching device 100.

[0043] Optionally, the motion component 112 may be a two-axis motion platform, a three-axis motion platform, a four-axis motion platform, a manipulator or other motion devices.

[0044] Specifically, see Figure 1 The moving assembly 112 includes a driving member 1121 and a moving arm 1122. The moving arm 1122 is mounted on the frame 111 through the driving member 1121, and the picking portion 113 is disposed on the moving arm 1122. The driving member 1121 drives the moving arm 1122 to move along a first direction, and the moving arm 1122 drives the picking portion 113 to move along a second direction, and the first direction intersects with the second direction. Driven by the driving member 1121, the moving arm 1122 moves on the frame 111. In this way, the structure of the moving assembly 112 is simple, so that the movement of the moving assembly 112 is more stable; at the same time, it can also improve the accuracy requirements for automatically picking up the extraction head 121, which is beneficial to saving the research and development and production costs of the extraction head switching device 100. In addition, designing the motion component 112 as a driving member 1121 and a motion arm 1122 is also conducive to simplifying the control program of the automatic control, reducing the probability of automatic control failure, improving the reliability of the operation of the extraction head switching device 100, and further improving the operating efficiency of the extraction head switching device 100. This embodiment only provides one implementation of the motion component 112, but is not limited thereto.

[0045] It should be noted that the picking-up portion 113 can be used to switchably pick up the switching component 140 and the sample injection component 131, which should be understood as the driving member 1121 serving as a power source to provide driving force to the moving arm 1122, and the picking-up portion 113 can pick up the switching component 140 driven by the moving arm 1122; at the same time, the picking-up portion 113 can also pick up the sample injection component 131 driven by the moving arm 1122.

[0046] In order to further explain and understand that the moving arm 1122 moves along the first direction and the moving arm 1122 drives the picking portion 113 to move along the second direction, Figure 1 For example, the first direction is the direction indicated by any arrow in S1; the second direction is the direction indicated by any arrow in S2.

[0047] Specifically, the first direction and the second direction are perpendicular to each other in the plane.

[0048] For further information, see Figure 1 , the moving component 112 can move back and forth between the first tray 120 and the second tray 130. It should be understood that the first tray 120 and the second tray are arranged on the frame 111 with an interval, and the moving component 112 can move along the length direction of the frame 111, so that the moving component 112 can move back and forth between the first tray 120 and the second tray 130.

[0049] In order to further explain and understand the movement along the length direction of the frame 111, Figure 1 For example, the length direction of the rack 111 is the direction indicated by any arrow S3.

[0050] Further, specifically, the first direction, the second direction and the length direction of the rack 111 are perpendicular to each other in space.

[0051] In one embodiment, see Figure 2 , a hanging hole 122 is provided on the first tray 120. The hanging hole 122 is used for the extraction head 121 to pass through, and the extraction head 121 is hung on the first tray 120. The provision of the hanging hole 122 is conducive to the vertical suspension of the extraction head 121, so that the first tray 120 can accommodate more extraction heads 121 and arrange them in an orderly manner, so that the movement trajectory of the picking part 113 is more streamlined, and it is convenient for the switching component 140 to grab and switch between different extraction heads 121, which is conducive to simplifying the control program of the automatic control, reducing the probability of automatic control failure, and improving the reliability of the operation of the extraction head switching device 100, thereby improving the operating efficiency of the extraction head switching device 100.

[0052] Optionally, the shape of the hanging hole 122 can be circular, square, rectangular, triangular or other shapes.

[0053] Specifically, the hanging hole 122 is circular. This helps to improve the stability of the first tray 120 fixing the extraction head 121, facilitates the switching assembly 140 to grab and switch between different extraction heads 121, improves the reliability of the extraction head switching device 100, and further improves the operating efficiency of the extraction head switching device 100. This embodiment only provides a shape selection of the hanging hole 122, but is not limited thereto.

[0054] In one embodiment, see Figure 1 and Figure 2, there are more than two hanging holes 122. The more than two hanging holes 122 are arranged at intervals along the length direction of the first tray 120. In this way, the more than two hanging holes 122 enable the first tray 120 to hang multiple extraction heads 121; at the same time, the extraction heads 121 are arranged in an orderly manner on the first tray 120, so that the movement trajectory of the picking part 113 is more streamlined, which facilitates the switching component 140 to grab and switch between different extraction heads 121, which is conducive to simplifying the control program of the automatic control, reducing the probability of automatic control failure, and improving the reliability of the operation of the extraction head switching device 100, thereby improving the operating efficiency of the extraction head switching device 100.

[0055] In one embodiment, see Figure 2 , a protrusion 123 is provided between two adjacent hanging holes 122. The cross-sectional area S of the protrusion 123 decreases from the end of the protrusion 123 close to the first tray 120 to the end of the protrusion 123 away from the first tray 120. In this way, when the picking portion 113 places the extraction head 121 on the hanging hole 122 of the first tray 120, the extraction head 121 can enter the hanging hole 122 more smoothly. At the same time, the setting of the protrusion 123 is also conducive to the calibration of the trajectory of the moving component 112, thereby ensuring the positioning accuracy of the moving arm 1122, and improving the reliability and working efficiency of the extraction head switching device 100.

[0056] Optionally, the first tray 120 and the frame 111 may be connected by bolt connection, snap connection, threaded connection, welding, bonding or other connection methods.

[0057] Specifically, see Figure 2 , the first tray 120 is connected to the frame 111 through the clamp-shaped fixing seat 124. In this way, the connection stability between the first tray 120 and the frame 111 can be effectively improved; at the same time, the clamp-shaped fixing seat 124 is conducive to the convenience of installation and removal of the first tray 120, making the position adjustment of the first tray 120 more convenient and quick, which is conducive to improving the overall quality and user experience of the extraction head switching device 100, thereby improving the reliability and operating efficiency of the extraction head switching device 100. This embodiment only provides a connection method between the first tray 120 and the frame 111, but is not limited to this.

[0058] The cross-sectional area S is the area S obtained by making a cross section of the protrusion 123 parallel to the first tray 120 .

[0059] In one embodiment, see Figure 3The switching assembly 140 includes a switching body 141 and a gripping structure 142. The gripping structure 142 is mounted on the switching body 141, and the switching body 141 is detachably connected to the picking portion 113. The gripping structure 142 is used to grab and place the extraction head 121. The modular design is conducive to improving the connection stability between the switching assembly 140 and the picking portion 113. On the one hand, by grabbing and placing the extraction head 121 through the gripping structure 142, the structure of the switching assembly 140 can be effectively simplified, which is conducive to the maintenance and replacement of the switching assembly 140; on the other hand, it makes the operation of grabbing and placing the extraction head 121 simpler and faster, which is conducive to improving the overall quality and user experience of the extraction head switching device 100.

[0060] Optionally, the gripper structure 142 can grip and place the extraction head 121 by switching the body 141 to drive the gripper structure 142, so that the gripper structure 142 can be opened and closed, thereby enabling the gripper structure 142 to grip and place the extraction head 121. Alternatively, the switching assembly 140 is provided with a transmission member 1422, and after the switching assembly 140 is connected to the picking portion 113, the picking portion 113 drives the transmission member 1422 under the driving action of the moving arm 1122, so that the transmission member 1422 drives the gripper structure 142 to grip and place the extraction head 121. Alternatively, other gripping and placing methods are provided.

[0061] Specifically, see Figure 3 The gripper structure 142 includes a gripper 1421 and a transmission member 1422. The transmission member 1422 and the gripper 1421 are both mounted on the switching body 141, and the gripper 1421 moves away from or towards the transmission member 1422. When the gripper 1421 and the transmission member 1422 are in contact with each other, the gripper 1421 is in an open state. When the gripper 1421 and the transmission member 1422 are out of contact, the gripper 1421 is in a closed state. The gripper 1421 is used to grab and place the extraction head 121. In this way, the switching component 140 does not need to be provided with a power source itself through the transmission effect of the transmission member 1422, which is conducive to simplifying the structure of the switching component 140, improving the reliability of the switching component 140, and thus improving the operating reliability and operating efficiency of the extraction head switching device 100. At the same time, such a setting makes the switching component 140 easy to maintain and can also effectively save the production cost of the switching component 140. This embodiment only provides a way for the gripping structure 142 to grip and place the extraction head 121 , but the invention is not limited thereto.

[0062] In one embodiment, please refer to Figure 3The switching body 141 is provided with a connecting portion 1411, and the connecting portion 1411 is detachably connected to the picking portion 113. In this way, it is convenient to connect the picking portion 113 with the switching assembly 140, and it is convenient for the switching assembly 140 to grab and switch between different extraction heads 121, which is conducive to simplifying the control program of the automatic control, reducing the probability of automatic control failure, improving the reliability of the extraction head switching device 100, and thus improving the operation efficiency of the extraction head switching device 100.

[0063] Optionally, the connection portion 1411 and the picking portion 113 may be detachably connected by means of a snap connection, a threaded connection, a bolt connection, an adhesive connection or other connection methods.

[0064] Specifically, the connecting portion 1411 is connected to the pick-up portion 113 by a bayonet connection. This is beneficial to the integrity of the pick-up portion 113, and also facilitates the connection and disassembly speed of the connecting portion 1411 and the pick-up portion 113, thereby improving the working efficiency of the extraction head switching device 100, reducing the errors in the automated extraction operation caused by the wrong connection between the pick-up portion 113 and the connecting portion 1411, and is beneficial to ensuring the reliability of the extraction head switching device 100, and improving the overall quality and user experience of the extraction head switching device 100. This embodiment only provides a connection method between the connecting portion 1411 and the pick-up portion 113, but is not limited thereto.

[0065] In one embodiment, see Figure 4 A method for switching an extraction head, using the extraction head switching device 100, comprises the following steps:

[0066] S10, starting the motion component 112, driving the picking portion 113 to pick up the switching component 140;

[0067] S20, driving the switching assembly 140 to move to the position of the first tray 120 through the motion assembly 112, and grabbing the extraction head 121 on the first tray 120 through the switching assembly 140;

[0068] S30, after grabbing, the switching assembly 140 is moved to the position of the second tray 130 through the moving assembly 112, and the extraction head 121 is loaded onto the sample injection part 131;

[0069] S40, after loading, move the switching assembly 140 away from the second tray 130, and release the switching assembly 140;

[0070] S50, after release, the picking-up part 113 is moved to the position of the second tray 130 by the moving assembly 112, and the picking-up part 113 picks up the sample injection part 131 equipped with the extraction head 121 to perform subsequent solid phase microextraction operations.

[0071] In the above extraction head switching method, during the installation process, the moving assembly 112 is first installed on the frame 111; then the first tray 120 and the second tray 130 are installed on the frame 111. During use, different types of extraction heads 121 are placed on the first tray 120; and the sample injection part 131 is placed on the second tray 130. In this way, after the extraction head switching device 100 is started, the moving assembly 112 can move on the frame 111. When the extraction head 121 needs to be switched, first the motion component 112 drives the picking part 113 to pick up the switching component 140; then the motion component 112 drives the switching component 140 to move to the first tray 120, and drives the switching component 140 to grab the extraction head 121 on the first tray 120 to the sample injection part 131 on the second tray 130, so that the extraction head 121 is loaded into the sample injection part 131; then, the motion component 112 drives the picking part 113 to release the switching component 140; then the motion component 112 drives the picking part 113 to pick up the sample injection part 131 on the second tray 130 with the extraction head 121, and performs the solid phase microextraction operation. The extraction head switching device 100 can automatically select and switch the extraction head 121. When analyzing multiple types of samples or continuously analyzing a large number of samples, there is no need to stop the machine to manually replace the extraction head 121, and the extraction head 121 between different extraction devices can be freely switched. The operation is simple, which is conducive to improving the automation and intelligence of the detection process. At the same time, it can also reduce or even avoid errors in manual switching of extraction heads that may lead to deviations in experimental results, thereby improving the reliability of experimental results.

[0072] In one embodiment, see Figure 5 S10, the step of starting the motion component 112 and driving the picking portion 113 to pick up the switching component 140 includes:

[0073] S11, starting the driving member 1121, and driving the moving arm 1122 to move along the first direction through the driving member 1121, so that the picking portion 113 is located above the switching assembly 140;

[0074] S12, start the moving arm 1122, and drive the picking portion 113 to move along the second direction through the moving arm 1122, so that the picking portion 113 contacts the switching assembly 140, and the connection is completed.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An extraction head switching device, characterized in that: The extraction head switching device comprises: A motion mechanism, the motion mechanism comprises a frame and a motion component, the motion component is movably mounted on the frame, and a picking portion is provided on the motion component; the motion component comprises a driving member and a motion arm, the motion arm is mounted on the frame through the driving member, and the picking portion is provided on the motion arm, the driving member drives the motion arm to move along a first direction, and the motion arm drives the picking portion to move along a second direction, and the first direction intersects with the second direction; A first tray and a second tray, wherein the first tray and the second tray are installed on the frame at an interval, and the moving assembly can move back and forth between the first tray and the second tray, the first tray is used to place the extraction head, and the second tray is used to place the sample injection piece; A switching assembly, wherein the picking portion can be used to pick up the switching assembly and the sample injection member in a switchable manner, the motion assembly is used to drive the switching assembly to grab the extraction head on the first tray to the second tray, and the motion assembly is also used to drive the picking portion to pick up the sample injection member equipped with the extraction head on the second tray to achieve switching of the extraction head; The switching assembly comprises a switching body and a gripper structure, wherein the gripper structure is mounted on the switching body, the switching body is detachably connected to the picking portion, and the gripper structure is used to grab and place the extraction head.

2. The extraction head switching device according to claim 1, characterized in that: The first tray is provided with a hanging hole, and the hanging hole is used for the extraction head to pass through, so that the extraction head is hung on the first tray.

3. The extraction head switching device according to claim 2, characterized in that: There are more than two hanging holes, and the more than two hanging holes are arranged at intervals along the length direction of the first tray.

4. The extraction head switching device according to claim 3, characterized in that: A protrusion is provided between two adjacent hanging holes, and a cross-sectional area S of the protrusion decreases from an end of the protrusion close to the first tray to an end of the protrusion far from the first tray.

5. The extraction head switching device according to claim 1, characterized in that: The gripper structure includes a gripper and a transmission member, wherein the transmission member and the gripper are both mounted on the switching body, and the gripper moves away from or toward the transmission member. When the gripper is in contact with the transmission member, the gripper is in an open state, and when the gripper is out of contact with the transmission member, the gripper is in a closed state. The gripper is used to grasp and place the extraction head.

6. The extraction head switching device according to claim 5, characterized in that: The switch body is provided with a connecting portion, and the connecting portion is detachably connected to the picking portion.

7. A method for switching an extraction head, characterized in that: The extraction head switching device according to any one of claims 1 to 6 comprises the following steps: Start the motion component to drive the picking part to pick up the switching component; The moving component drives the switching component to move to the first tray position, and the switching component grabs the extraction head on the first tray; After grabbing, the switching assembly is moved to the second tray position by the moving assembly, and the extraction head is loaded onto the sample injection part; After loading, the switching assembly is moved away from the second tray and the switching assembly is released; After release, the picking-up part is moved to the second tray position by the moving assembly, and the picking-up part picks up the sample injection part equipped with the extraction head to perform subsequent solid phase microextraction operations.

8. The extraction head switching method according to claim 7, characterized in that: The steps of starting the motion component and driving the picking part to pick up the switching component include: Starting the driving member, and driving the moving arm to move along the first direction through the driving member, so that the picking portion is located above the switching assembly; The moving arm is started, and the picking portion is driven to move along the second direction by the moving arm, so that the picking portion contacts the switching component and the connection is completed.

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