Liquid separation mechanism and sample pretreatment equipment

Abstract

The utility model discloses a liquid separation mechanism and sample pretreatment equipment, the liquid separation mechanism comprises: a mounting rack, which comprises a liquid receiving part and a correction part, the liquid receiving part is used for limiting a subpackaging bottle to a liquid receiving position, and the subpackaging bottle is used for accommodating a subpackaging sample; the liquid separation assembly comprises a liquid separation part, the liquid separation part is used for containing and transferring a sample and injecting the sample into the subpackaging bottle at the liquid receiving position, the liquid receiving position and the correction part are fixed on the mounting rack at the relative position, and after the position of the liquid separation part is corrected by the correction part, the sample is injected into the subpackaging bottle at the liquid receiving position. In the process of filling samples into the subpackaging bottle through the liquid separation part, the position of the liquid separation part is calibrated through the correction part, and the liquid separation part is driven through the accurate relative position of the correction part and the liquid receiving position, so that the error in the process of moving the liquid separation part to the liquid receiving position is reduced, and the accuracy of sample filling is improved. And the accuracy of the process of injecting liquid into the split charging bottle by the liquid separation part is improved.

Description

Technical Field

[0001] This utility model relates to the field of sample detection technology, and in particular to a liquid separation mechanism and a sample pretreatment device. Background Technology

[0002] In the process of sample dispensing of liquid materials, dispensing equipment, such as syringes, is usually required to aspirate, transfer, and dispense the sample. After transfer, the dispensing equipment needs to move to a preset position to dispense the sample into the corresponding dispensing bottle. This process is the basis for accurate sample dispensing. However, due to differences in dispensing components and the repeated actions of the sample dispensing process, current dispensing equipment may experience positioning discrepancies between the dispensing equipment and the preset dispensing bottle. This can lead to liquid leakage or even collisions and interference between the dispensing equipment and the dispensing bottle, resulting in sample dispensing failure. In severe cases, it may be necessary to stop the equipment for maintenance and calibration, thus affecting production efficiency.

[0003] Therefore, how to improve the accuracy of liquid material sample dispensing process is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a liquid dispensing mechanism to improve the accuracy of liquid material sample dispensing process.

[0005] Another objective of this invention is to provide a sample pretreatment device that includes the above-mentioned liquid separation mechanism.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A liquid dispensing mechanism, comprising:

[0008] The mounting bracket includes a liquid receiving part and a straightening part. The liquid receiving part is used to limit the dispensing bottle to the liquid receiving position, and the dispensing bottle is used to contain the dispensing sample.

[0009] The dispensing assembly includes a dispensing section for holding and transferring a sample and injecting the sample into the dispensing bottle at the receiving position. The receiving position and the relative position of the calibration section on the mounting frame are fixed. After the dispensing section is calibrated by the calibration section, it adds the sample into the dispensing bottle at the receiving position.

[0010] Preferably, in the above-mentioned liquid dispensing mechanism, the liquid receiving part includes a support platform and a gripper disposed on the support platform. The support platform can be located at the liquid receiving position, and the gripper is used to clamp the dispensing bottle circumferentially and limit the dispensing bottle to the liquid receiving position.

[0011] Preferably, the above-mentioned liquid dispensing mechanism further includes a fixed seat, on which a slide rail is provided, and the support platform is slidably disposed on the slide rail and passes through the liquid receiving position, and the support platform is limited by the fixed seat at the liquid receiving position.

[0012] Preferably, in the above-mentioned dispensing mechanism, the dispensing mechanism includes a capping section, and the support platform passes through the capping position on the guide path of the slide. The capping section is used to transport the dispensing bottle to the capping position and to open the capping bottle after the gripper clamps the dispensing bottle.

[0013] Preferably, in the above-mentioned dispensing mechanism, multiple sets of slides are arranged at intervals to accommodate dispensing bottles of different specifications. Each set of slides is arranged in parallel, and each set of slides has a liquid receiving position.

[0014] Preferably, in the above-mentioned dispensing mechanism, each set of slides is provided with at least one pair of positioning sensors and liquid level sensors. The positioning sensors are used to detect that the dispensing bottle at the liquid receiving position has moved into place, and the liquid level sensors are used to detect the filling liquid level in the dispensing bottle.

[0015] Preferably, in the above-mentioned dispensing mechanism, at least one set of the positioning sensors corresponding to the slide is inclined, and the slide is adapted to two specifications of dispensing bottles with the same outer diameter but different heights.

[0016] Preferably, the above-mentioned dispensing mechanism further includes a support frame disposed on one side of the mounting frame. The support frame is used to carry the dispensing bottle, and the capping part clamps the dispensing bottle at the position of the support frame and transports it to the capping position on the slide.

[0017] Preferably, in the above-mentioned liquid dispensing mechanism, the calibration part is a closed frame structure and a first sensor and a second sensor are provided on the inner wall of the frame. The first sensor and the second sensor are linear sensors and their sensing paths intersect. The outer diameter of the liquid injection end of the dispensing part is smaller than that of the closed frame and is calibrated at the intersection of the first sensor and the second sensor.

[0018] Preferably, in the above-mentioned liquid dispensing mechanism, the corrector is a rectangular frame structure, and the sensing paths of the first sensor and the second sensor are perpendicular.

[0019] A sample pretreatment device includes the liquid separation mechanism described in any of the above embodiments.

[0020] As can be seen from the above technical solution, the dispensing mechanism provided by this utility model calibrates the dispensing section by a calibration section before adding the sample into the dispensing bottle. This ensures that the dispensing section has a precise position on the mounting frame. By utilizing the fixed relative position of the calibration section and the receiving position on the mounting frame, the dispensing section can move to a position directly above the receiving position and add the sample to the dispensing bottle located at the receiving position after calibration by the calibration section. Compared with the current direct-drive dispensing method, this method has a more precise calibration process. Moreover, the dispensing section can be calibrated by the calibration section on the mounting frame each time it moves to the receiving position. For dispensing conditions with a thin dispensing tip and a small diameter dispensing bottle, this method can improve the accuracy of the dispensing section and reduce the risk of sample dispensing failure. Attached Figure Description

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.

[0022] Figure 1 This is a partial structural diagram of the liquid dispensing mechanism provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the corrector section;

[0024] Figure 3 A schematic diagram showing the structure of the support platform on the slide rail;

[0025] Figure 4 This is a structural diagram of the mounting frame and the support frame;

[0026] Figure 5 A schematic diagram of the sample pretreatment equipment provided in an embodiment of this utility model.

[0027] Among them, 10-mounting bracket; 110-liquid receiving part; 1110-support platform; 1120-gripper; 1130-fixed seat; 1140-slide rail; 1150-positioning sensor; 120-correction part; 1210-first sensor; 1220-second sensor; 20-dispensing assembly; 210-dispensing part; 220-cap opening part; 30-carrying frame; 310-dispensing bottle; 100-dispensing mechanism. Detailed Implementation

[0028] The core of this invention lies in disclosing a liquid dispensing mechanism to improve the accuracy of liquid material sample dispensing.

[0029] Another objective of this invention is to provide a sample pretreatment device that includes the above-mentioned liquid separation mechanism.

[0030] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention as described in the claims.

[0031] like Figure 1 As shown, the liquid dispensing mechanism provided in this embodiment of the present invention mainly includes a mounting frame 10 and a liquid dispensing assembly 20. The mounting frame 10 is a support structure for supporting the dispensing bottle 310, which is a container component in the sample dispensing process. The mounting frame 10 includes a liquid receiving part 110 and a straightening part 120. The liquid receiving part 110 is used to limit and lock the dispensing bottle 310 in the liquid receiving position so that the liquid receiving part 110 remains stable and can receive the sample added by the liquid dispensing assembly 20. The calibration part 120 is used for calibrating the dispensing assembly 20. It should be noted that since the liquid receiving position is defined by the liquid receiving part 110, and both the liquid receiving part 110 and the calibration part 120 are provided on the mounting frame 10, the liquid receiving part 110 and the calibration part 120 can have a precise relative position when the mounting frame 10 is stable. Before dispensing liquid, the dispensing assembly 20 can be calibrated based on the calibration part 120, so that the dispensing assembly 20 has a more precise position relative to the liquid receiving part 110 based on the mounting frame 10. Then, by driving again, the dispensing assembly 20 can be accurately moved to the position of the liquid receiving part 110.

[0032] Furthermore, the dispensing assembly 20 includes a dispensing section 210, which is used for sample placement and transfer, and injects the sample into the dispensing bottle 310 at the receiving position. It should be noted that the dispensing section 210 can be a syringe, which can achieve sample aspiration and discharge through expansion and contraction. After the dispensing section 210 aspirates in the sample placement area, it is calibrated at the position of the calibration section 120 by the transfer movement of the dispensing assembly 20, and after calibration, it moves directly above the receiving section 110 and discharges the sample inside, thus completing the injection of the sample into the dispensing bottle. In some embodiments of this utility model, the dispensing section 210 is a syringe structure, and the calibration section 120 is used to calibrate the syringe barrel area so that the syringe barrel can smoothly move directly above the receiving position.

[0033] It should be noted that the accurate calibration of the dispensing section 210 by the calibration section 120 is the basis for the accurate positioning of the dispensing section 210 at the liquid receiving position. The calibration section 120 can be an L-shaped beam structure with intersections in two directions. The area on the dispensing section 210 that needs to be calibrated, such as the syringe structure of a syringe, first moves to the area that contacts one of the beam structures of the calibration section 120, and then aligns with the other beam structure of the calibration section 120 until it comes into contact with the two beam structures, that is, it is located inside the intersection of the L-shaped beams, thus achieving the accurate positioning of the dispensing section 210.

[0034] To avoid further errors between the dispensing section 210 and the corrector section 120 during rigid collisions, in some embodiments of this invention, such as... Figure 1 and Figure 2 As shown, the correction section 120 is a closed frame structure, while the outer diameter of the liquid injection end on the dispensing section 210 is smaller than the end of the closed frame used for outputting the sample, so that the liquid injection end of the dispensing section 210 can pass through the inside of the closed frame of the correction section 120. Meanwhile, the inner wall of the closed frame is provided with at least a first sensor 1210 and a second sensor 1220 to provide position feedback for the dispensing section 210. Specifically, the first sensor 1210 and the second sensor 1220 are linear sensors and their sensing paths intersect. Taking the example that both the first sensor 1210 and the second sensor 1220 are laser sensors, when the dispensing end on the dispensing section 210 passes through the frame structure of the straightening section 120 and moves, it will first block the laser path of one of the first sensor 1210 and the second sensor 1220. Taking the first sensor 1210 as an example, after the dispensing end moves to the laser path of the first sensor 1210, the first sensor 1210 is blocked and feeds back to the driving component of the dispensing end. The driving component further drives the dispensing end to run along the laser path direction of the first sensor 1210 until it runs to the intersection of the laser paths of the first sensor 1210 and the second sensor 1220. At this time, the laser path of the second sensor 1220 is also blocked, and the dispensing end is adjusted into position. Based on this, the liquid receiving part 110 limits the liquid receiving position of the dispensing bottle 310 to be set with reference to the intersection of the laser paths of the first sensor 1210 and the second sensor 1220, so that after the liquid dispensing end reaches the intersection of the laser paths of the first sensor 1210 and the second sensor 1220, it can move a preset distance to reach directly above the liquid receiving position.

[0035] The above embodiments, by setting the first sensor 1210 and the second sensor 1220, enable the dispensing part 210 to achieve calibration and positioning without physical collision with the calibration part 120, thereby further improving the accuracy of the dispensing part 210 in moving towards the liquid receiving position. Furthermore, in some embodiments of this invention, the calibration part 120 is designed as a regular rectangular frame structure, and the first sensor 1210 and the second sensor 1220 are disposed on two adjacent inner walls of the rectangular frame. Simultaneously, the sensing paths of the first sensor 1210 and the second sensor 1220 are vertically arranged, enabling them to compare a point within the closed frame of the calibration part 120 in a cross-shaped structure. Based on this, the driving process of the dispensing part 210 is simpler and more accurate, i.e., it moves along the laser path of the cross-shaped structure, simplifying the adjustment process and reducing the risk of errors.

[0036] Furthermore, in the liquid dispensing mechanism provided in this embodiment of the present invention, the liquid receiving part 110 specifically includes a support platform 1110 and a gripper 1120 disposed on the support platform 1110. Specifically, the gripper 1120 is used to clamp and fix the dispensing bottle 310 circumferentially. In some embodiments, the gripper 1120 includes two sections in its axial direction, namely a partially open structure and a partially closed annular structure. The dispensing bottle 310 can be inserted into the gripper 1120 and clamped through the area of ​​the open structure. The support platform 1110 is used to support the gripper 1120. The support platform 1110 can be located at the liquid receiving position and can be precisely positioned by the gripper 1120, thereby keeping the dispensing bottle 310 fixed at the liquid receiving position.

[0037] Based on the above embodiments, and considering the transportation needs of the dispensing bottles 310, such as Figure 3 As shown, the liquid receiving part 110 also includes a fixed seat 1130, which is a fixedly installed load-bearing structure. The fixed seat 1130 is provided with a slide rail 1140 structure, and the support platform 1110 is slidably installed on the slide rail 1140 so that it can move under the guide path of the slide rail 1140. It should be noted that the support platform 1110 can be provided with a protrusion or a pulley or other structure to slide in cooperation with the slide rail 1140, and can be driven by a motor or cylinder, etc. The conventional sliding and driving cooperation is used and will not be described in detail here. Specifically, the guide path of the slide 1140 passes through the liquid receiving position, and the support platform 1110 can pass through the liquid receiving position during its operation along the slide 1140. At the same time, the support platform 1110 is limited by the fixed seat 1130 at the liquid receiving position, which can be achieved by setting a protruding locking component. Similarly, in some embodiments of this utility model, the support platform 1110 is located at one end of the slide 1140 when it is in the liquid receiving position, and is thus limited by the end of the path of the slide 1140.

[0038] It should be noted that the setting of the fixed seat 1130 and the slide 1140 increases the freedom of setting the dispensing bottle 310. The dispensing bottle 310 can be set at any position on the guide path of the slide 1140. The dispensing bottle 310 is clamped by the gripper 1120 on the guide path of the slide 1140, and can reach the liquid receiving position through the sliding action of the support platform 1110 to realize the subsequent sample filling of the dispensing part 210.

[0039] Furthermore, in some embodiments of this utility model, the dispensing mechanism also includes a capping part 220, and correspondingly, the fixed base 1130 is also provided with a capping position for opening the dispensing bottle 310. The capping position is set on the guide path of the slide 1140, so that the support platform 1110 can drive the gripper 1120 to the capping position on the slide 1140 during the sliding process of the slide 1140. Meanwhile, the capping part 220 is used to transport and open the dispensing bottle 310. Since the dispensing bottle 310 needs to maintain its cleanliness, the dispensing bottle 310 is a bottle-shaped structure with a cap. The capping part 220 is used to clamp the cap area of ​​the dispensing bottle 310 so as to drive the dispensing bottle 310 to move. The capping part 220 moves the dispensing bottle 310 to the capping position so as to place the dispensing bottle 310 on the support platform 1110 located at the capping position. After the support platform 1110 clamps the dispensing bottle 310 with the gripper 1120, the main structure of the dispensing bottle 310 remains stationary. At this time, the capping part 220 can realize the capping action of the dispensing bottle 310 by rotating.

[0040] It should be noted that in the above structure, by setting the movement path of the support platform 1110, the dispensing bottles 310 in other areas can be moved to the opening position on the slide 1140 through the opening part 220, and the main body of the dispensing bottle 310 is clamped by the gripper 1120 located at the opening position. Then, the opening part 220 rotates to unscrew the cap of the dispensing bottle 310. The open dispensing bottle 310 is carried by the support platform 1110 and moves along the slide 1140 to the liquid receiving position to receive the sample added by the dispensing part 210. After the dispensing bottle 310 completes the sample reception, the support platform 1110 carries the dispensing bottle 310 back to the capping position. At this time, the cap temporarily stored in the capping part 220 is locked with the dispensing bottle 310 by the rotation of the capping part 220. The gripper 1120 is released and the capping part 220 drives the dispensing bottle 310 to move to other placement positions, thus completing a single cycle of the dispensing bottle 310.

[0041] To improve the efficiency of the dispensing mechanism provided in this embodiment of the invention during the sample dispensing process, in some embodiments of the invention, multiple sets of slides 1140 are arranged at intervals, so that the dispensing mechanism can simultaneously perform dispensing operations on multiple dispensing bottles 310. It should also be noted that the specifications of the grippers 1120 supported by the support platform 1110 in the multiple sets of slides 1140 can be the same to improve the dispensing efficiency of dispensing bottles 310 of the same specifications; at the same time, the specifications of the grippers 1120 can also be different to adapt to dispensing bottles 310 of different specifications.

[0042] It should be noted that it is preferable that each set of slides 1140 is arranged in parallel so that the structure of the fixing seat 1130 is more regular. At the same time, the lengths of the slides 1140 are equal so that the liquid contact positions on multiple sets of slides 1140 are located on the same straight line. This ensures that the liquid dispensing part 210, after being calibrated by the correction part 120, has the same number of movement directions when moving towards the liquid contact positions on different slides 1140, thereby reducing the error of the liquid dispensing part 210 moving towards different liquid contact positions.

[0043] To further optimize the above technical solution, in the liquid dispensing mechanism provided in this embodiment of the utility model, each set of slides 1140 is correspondingly provided with at least one position sensor 1150 and one liquid level sensor to improve the stability of the working process of the liquid dispensing mechanism. Specifically, the position sensor 1150 is used to detect that the dispensing bottle 310 at the liquid receiving position has moved into place, and preferably the detection range of the position sensor 1150 includes the top opening position of the dispensing bottle 310 to detect the opening state of the dispensing bottle 310. The position sensor 1150 is communicatively connected to the driving mechanism of the liquid dispensing section 210, and when the position sensor 1150 detects that there is no dispensing bottle 310 at the corresponding liquid receiving position, that is, the supply of dispensing bottle 310 fails, or the cap of the dispensing bottle 310 at the corresponding liquid receiving position is not unscrewed, the driving mechanism of the liquid dispensing section 210 is fed back to stop running, thereby avoiding the liquid dispensing section 210 from failing to dispense liquid.

[0044] Meanwhile, a liquid level sensor is used to detect the liquid level in the dispensing bottle 310 at the receiving position. The liquid level sensor is communicatively connected to the drive mechanism of the dispensing unit 210 during the dispensing process. Upon detecting that the sample in the corresponding dispensing bottle 310 has reached the preset liquid level, the sensor signals the drive mechanism to stop moving, and the dispensing unit 210 stops dispensing to prevent sample overflow from the dispensing bottle 310. The liquid level sensor and the position sensor 1150 further improve the operational stability of the dispensing mechanism, preventing mis-dispensing or overflow during sample dispensing.

[0045] Furthermore, it should be noted that, based on the above embodiments, the position sensor 1150 can be set horizontally or tilted to detect the dispensing bottle 310; at the same time, at least one set of position sensors 1150 corresponding to the slide rail 1140 are tilted. The slide rail 1140 is adapted to two or more dispensing bottles 310 with the same outer diameter but different heights, so that the slide rail 1140 has stronger versatility and can meet the use of two or more sizes of dispensing bottles 310, thereby reducing the cost of the fixing seat 1130.

[0046] Furthermore, in some embodiments of this utility model, such as Figure 4 As shown, the dispensing mechanism also includes a support frame 30, which is disposed on one side of the overall structure of the mounting frame 10 for carrying the dispensing bottles 310. The size and accommodating position of the support frame 30 can be designed according to the type and quantity requirements of the dispensing bottles 310. The movement range of the capping part 220 covers the entire area of ​​the support frame 30, so as to clamp the dispensing bottles 310 at any position on the support frame 30 and transport them to the capping position on the slide 1140 for the capping action of the dispensing bottles 310.

[0047] Furthermore, such as Figure 5 As shown, this embodiment of the present invention also provides a sample pretreatment device, which includes a dispensing mechanism 100 provided in any of the above embodiments to realize the transportation, capping, and liquid injection of dispensing bottles 310 of different specifications. It should be noted that since the dispensing mechanism 100 possesses the technical effects provided in any of the above embodiments, this sample pretreatment device also possesses the above technical effects, and will not be described in detail here.

[0048] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0049] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0050] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed, and is not intended to limit this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. The scope of this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this utility model.

Claims

1. A liquid dispensing mechanism, characterized in that, include: The mounting bracket (10) includes a liquid receiving part (110) and a straightening part (120), wherein the liquid receiving part (110) is used to limit the dispensing bottle (310) to the liquid receiving position, and the dispensing bottle (310) is used to contain the dispensing sample; The dispensing assembly (20) includes a dispensing section (210) for holding and transferring samples and injecting the samples into the dispensing bottle (310) at the receiving position. The receiving position and the calibration section (120) are fixed in relative position on the mounting bracket (10). After the dispensing section (210) is calibrated by the calibration section (120), the sample is added into the dispensing bottle (310) at the receiving position.

2. The liquid dispensing mechanism as described in claim 1, characterized in that, The liquid receiving part (110) includes a support platform (1110) and a gripper (1120) disposed on the support platform (1110). The support platform (1110) can be located at the liquid receiving position. The gripper (1120) is used to clamp the dispensing bottle (310) circumferentially and can limit the dispensing bottle (310) to the liquid receiving position.

3. The liquid dispensing mechanism as described in claim 2, characterized in that, The liquid receiving part (110) also includes a fixed seat (1130), on which a slide (1140) is provided. The support platform (1110) is slidably disposed on the slide (1140) and passes through the liquid receiving position. The support platform (1110) is limited by the fixed seat (1130) at the liquid receiving position.

4. The liquid dispensing mechanism as described in claim 3, characterized in that, The dispensing mechanism includes a capping section (220), and the support platform (1110) passes through the capping position on the guide path of the slide (1140). The capping section (220) is used to transport the dispensing bottle (310) to the capping position and to open the dispensing bottle (310) after the gripper (1120) clamps the dispensing bottle (310).

5. The liquid dispensing mechanism as described in claim 3, characterized in that, Multiple sets of slides (1140) are arranged at intervals to accommodate dispensing bottles (310) of different specifications. Each set of slides (1140) is arranged in parallel, and each set of slides (1140) has a liquid receiving position.

6. The liquid dispensing mechanism as described in claim 5, characterized in that, Each set of the slides (1140) is provided with at least one pair of position sensors (1150) and liquid level sensors. The position sensors (1150) are used to detect that the dispensing bottle (310) at the liquid receiving position has moved into place, and the liquid level sensors are used to detect the filling liquid level in the dispensing bottle (310).

7. The liquid dispensing mechanism as described in claim 6, characterized in that, At least one set of the slide (1140) is provided with the position sensor (1150) tilted, and the slide (1140) is adapted to two sizes of dispensing bottles (310) with the same outer diameter but different heights.

8. The liquid dispensing mechanism as described in claim 4, characterized in that, It also includes a support frame (30) disposed on one side of the mounting frame (10), the support frame (30) is used to support the dispensing bottle (310), and the cap opening part (220) clamps the dispensing bottle (310) at the position of the support frame (30) and transports it to the cap opening position on the slide (1140).

9. The liquid dispensing mechanism as described in claim 1, characterized in that, The calibration part (120) is a closed frame structure and a first sensor (1210) and a second sensor (1220) are provided on the inner wall of the frame. The first sensor (1210) and the second sensor (1220) are linear sensors and their sensing paths intersect. The outer diameter of the liquid dispensing part (210) is smaller than that of the closed frame and is calibrated at the intersection of the first sensor (1210) and the second sensor (1220).

10. The liquid dispensing mechanism as described in claim 9, characterized in that, The correction part (120) has a rectangular frame structure, and the sensing paths of the first sensor (1210) and the second sensor (1220) are perpendicular.

11. A sample pretreatment device, characterized in that, Includes the liquid dispensing mechanism (100) as described in any one of claims 1-10.

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