Piercing seal structure for use in a moisture meter

Abstract

The application provides a puncture sealing structure for a water content tester, which comprises: an air inlet needle puncture support, a double-drive puncture support, a first lead screw sliding table and a second lead screw sliding table, the air inlet needle puncture support is fixed to the first lead screw sliding table, and the double-drive puncture support is fixed to the second lead screw sliding table; an air outlet needle fixing part, an air outlet needle and a sealing gasket are sequentially assembled to the air outlet needle fixing part; a pressing cap, a guide rod is assembled to the pressing cap, a switch fixing part and a micro switch are sequentially assembled to the pressing cap; an air inlet needle fixing part is assembled to the air inlet needle puncture support, a sample inlet needle passes through the air inlet needle fixing part and a fine needle sealing part, and the fine needle sealing part is assembled to the air outlet needle fixing part.

Description

Technical Field

[0001] This application relates to the field of moisture determination technology, and in particular to a bronchoscope support and a puncture sealing structure for use in a moisture analyzer. Background Technology

[0002] The current structure used for puncturing water-containing sample vials involves a lead screw motor driving the injection needle and the vent needle to puncture the vial pad. However, this structure has certain drawbacks: (1) When the injection needle punctures the vial pad, the continuous blowing of air may cause water leakage from the sample vial. (2) Due to the inconsistent solid state inside the sample vial, there are different requirements for the distance the vent needle enters the sample vial, and the current structure cannot meet the needs of different samples. (3) It cannot be adapted to sample vials of different heights. Utility Model Content

[0003] The purpose of this application is to provide a puncture sealing structure for a moisture analyzer to solve or alleviate the problems existing in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A puncture seal structure for use in a moisture analyzer, comprising:

[0006] An air-inlet needle puncture bracket and a dual-drive puncture bracket are respectively adapted to a first lead screw slide and a second lead screw slide. The air-inlet needle puncture bracket is fixed to the first lead screw slide, and the dual-drive puncture bracket is fixed to the second lead screw slide.

[0007] An air needle fixing component is assembled on the dual-drive puncture bracket, and the air needle and sealing gasket are sequentially assembled to the air needle fixing component;

[0008] A pressure cap and a guide rod are assembled to the pressure cap, and a switch fixing component and a micro switch are assembled to the pressure cap in sequence;

[0009] An air inlet needle fixing component is assembled on the air inlet needle puncture bracket. The injection needle passes through the air inlet needle fixing component and the fine needle seal. The fine needle seal is assembled to the air outlet needle fixing component.

[0010] The technical solution provided in this application adopts a timing design of "the venting needle punctures first, followed by the inlet needle." The venting needle is mounted on a dual-drive puncture bracket and, driven by the second screw slide, punctures the sample vial gasket first. At this time, the inlet needle has not yet begun puncture, avoiding the situation in traditional structures where the puncture and blowing of the injection needle occur simultaneously. Simultaneously, the sealing gasket on the venting needle fixture tightly adheres to the sample vial opening after puncture, working in conjunction with the fine needle seal to seal the interface between the injection needle and the venting needle fixture, forming a double sealing barrier and significantly reducing the possibility of moisture leakage. Furthermore, the first screw slide independently drives the inlet needle puncture bracket, allowing for precise control of the puncture depth of the injection needle based on the sample's solid state. Operators can preset different depth parameters to meet diverse sample testing needs, overcoming the limitation of traditional structures where the injection needle and venting needle are linked, preventing independent depth adjustment. The feedback mechanism consisting of the pressure cap, guide rod, and microswitch plays a crucial role. When the second lead screw slide moves the dual-drive puncture support downwards, the pressure cap first contacts the sample vial. As the support continues to descend, the guide rod slides relative to the dual-drive puncture support until the microswitch is triggered by the support, and the second lead screw slide stops operating. During this process, regardless of the sample vial height, the triggering mechanism of the microswitch ensures that the puncture depth of the vent needle remains consistent, achieving adaptive adaptation to sample vials of different heights. Attached Figure Description

[0011] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0012] Figure 1 This is an exploded structural diagram of a puncture sealing structure used in a moisture analyzer according to an embodiment of this application.

[0013] Figure 2 This is a cross-sectional schematic diagram of a puncture sealing structure used in a moisture analyzer according to an embodiment of this application. Detailed Implementation

[0014] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0015] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0016] Figure 1 This is an exploded structural diagram of a puncture sealing structure used in a moisture analyzer according to an embodiment of this application. Figure 2 This is a cross-sectional schematic diagram of a puncture sealing structure used in a moisture analyzer according to an embodiment of this application.

[0017] like Figure 1-2 As shown, an exemplary description is provided of the puncture sealing structure for a moisture analyzer provided in the embodiments of this application.

[0018] This application provides a puncture sealing structure for a moisture analyzer, comprising:

[0019] The air-inlet needle puncture bracket 2 and the dual-drive puncture bracket 8 are respectively adapted to the first lead screw slide 20 and the second lead screw slide 21. The air-inlet needle puncture bracket 2 is fixed to the first lead screw slide 20, and the dual-drive puncture bracket 8 is fixed to the second lead screw slide 21.

[0020] The air needle fixing component 11 is assembled on the dual-drive puncture bracket 8, and the air needle 12 and the sealing gasket 13 are sequentially assembled to the air needle fixing component 11.

[0021] A pressure cap 17 and a guide rod 16 are assembled to the pressure cap 17, and a switch fixing component 18 and a micro switch 19 are sequentially assembled to the pressure cap 17;

[0022] An air inlet needle fixing component 4 is assembled on the air inlet needle puncture bracket 2. The injection needle 6 passes through the air inlet needle fixing component 4 and the fine needle seal 7. The fine needle seal 7 is assembled to the air outlet needle fixing component 11.

[0023] The second lead screw slide 21 drives the dual-drive puncture bracket 8 downward, so that the pressure cap 17 first contacts the sample bottle 22, and the air outlet needle 12 first punctures the sample bottle pad. After the sample bottle 22 continues to move downward to the bottom, the pressure cap 17 and the guide rod 16 stop. The dual-drive puncture bracket 8 continues to move with the second lead screw slide 21 until the micro switch 19 is triggered by the dual-drive puncture bracket 8, and the second lead screw slide 21 stops. Then the first lead screw slide 20 drives the air inlet needle downward to the set depth.

[0024] Specifically, see the above. Figure 1 and Figure 2 The first lead screw slide 20 and the second lead screw slide 21 are arranged in parallel and vertically, forming the "longitudinal motion support skeleton" of the structure. The air inlet needle puncture bracket 2 is horizontally fixed on the slide of the first lead screw slide 20, and the dual-drive puncture bracket 8 is horizontally fixed on the slide of the second lead screw slide 21. The two are at the same horizontal height and can move up and down independently along the length direction (vertical direction) of the lead screw slide.

[0025] The air needle fixing component 11 penetrates vertically through the central area of ​​the dual-drive puncture bracket 8 and is rigidly connected to the dual-drive puncture bracket 8 by means of screws / slots, etc. Its axis coincides with the vertical movement direction of the dual-drive puncture bracket 8 and the driving direction of the second lead screw slide.

[0026] The vent needle 12 is inserted and fixed from the lower end of the fixing part along the axial direction of the vent needle fixing part 11. The sealing gasket 13 is sleeved on the upper part of the vent needle 12 and the lower end face of the vent needle fixing part 11, forming a coaxial assembly structure of "fixing part - sealing gasket - vent needle", and the axes of the three are aligned with the center of the bottle mouth of the sample bottle 22.

[0027] The pressure cap 17 is located directly below the dual-drive puncture bracket 8 and has a "bowl-shaped" or "disc-shaped" structure. A through hole is opened in the central area of ​​the pressure cap 17. The upper end of the guide rod 16 is rigidly connected to the bottom center of the pressure cap 17 (such as by threading or welding), and the lower end passes through the guide hole on the dual-drive puncture bracket 8 to form a vertical guide constraint of "pressure cap - guide rod - dual-drive puncture bracket" to ensure that the movement direction of the pressure cap is parallel to the axis of the air outlet needle.

[0028] The switch holder 18 has an "L-shaped" or "plate-shaped" structure. The horizontal section is fixed to the side edge of the pressure cap 17 (e.g., by screw fastening), and the vertical section extends upward. The micro switch 19 is fixed to the vertical section of the switch holder 18 by a snap / screw, and the trigger contact of the micro switch faces upward, opposite to the lower surface of the dual-drive puncture bracket 8, forming a trigger link of "pressure cap - switch holder - micro switch".

[0029] The air inlet needle fixing component 4 penetrates vertically through the central area of ​​the air inlet needle puncture bracket 2 and is rigidly connected to the air inlet needle puncture bracket 2 by screws / slots. Its axis coincides with the vertical movement direction of the first lead screw slide 20 and is parallel to the axis of the air outlet needle fixing component 11. The spacing is adapted to the size of the sample bottle.

[0030] The injection needle 6 is inserted and fixed from the lower end of the inlet needle fixing part 4 along the axial direction of the inlet needle fixing part 4. The fine needle seal 7 is an "annular sealing structure" and is sleeved on the upper part of the injection needle 6 and the lower end face of the inlet needle fixing part 4. The outer side of the fine needle seal 7 is connected to the side wall of the outlet needle fixing part 11 by threads / clamps, forming a cross-component sealing connection of "inlet needle fixing part - fine needle seal part - outlet needle fixing part".

[0031] The sample bottle 22 is placed in the support area (such as the stage) directly below the pressure cap 17, with the bottle mouth facing upwards. The center of the bottle mouth is aligned with the center of the vent needle 12 and the pressure cap 17, ensuring that the pressure cap contacts the bottle mouth first and the vent needle accurately punctures the bottle gasket.

[0032] When the second lead screw slide 21 drives the dual-drive puncture bracket 8 downward, the pressure cap 17 first contacts the sample bottle 22. Since the sample bottle is supported (such as by the stage), the pressure cap and guide rod are blocked by the sample bottle and stop moving. The dual-drive puncture bracket 8 continues to move downward with the second lead screw slide 21 until the micro switch 19 is triggered on the lower surface of the dual-drive puncture bracket 8. When the first lead screw slide 20 drives the air inlet needle puncture bracket 2 downward, the injection needle 6 punctures into the sample bottle along its own axis. The depth is controlled by the stroke of the first lead screw slide.

[0033] Optionally, it also includes an air tube connection assembly, which includes a conical washer 3 and a fixing nut 1 connected to the air inlet needle fixing member 4, and a conical washer 10 and a fixing nut 9 connected to the air outlet needle fixing member 11, for fixing the air tube to establish an air passage.

[0034] Specifically, the conical washer 3 is a "conical sealing ring" that is fitted onto the outer side of the upper end of the air intake needle fixing part 4, with its conical surface facing the top end face of the air intake needle fixing part 4, forming a "conical surface fit" pre-sealing structure with the outer wall of the air intake needle fixing part 4. The fixing nut 1 is a "hexagonal nut" or "round locking nut" that is screwed onto the upper external thread of the air intake needle fixing part 4. When tightened downwards, it compresses the conical surface of the conical washer 3, causing the conical washer 3 to undergo elastic deformation and tightly fit the outer wall of the air intake needle fixing part 4 and the inner wall of the air pipe (the air pipe is fitted onto the upper end of the air intake needle fixing part), forming a sealed air passage connection of "fixing nut - conical washer - air intake needle fixing part", and the three are coaxially assembled, with their axes coinciding with the axis of the air intake needle fixing part 4.

[0035] The conical washer 10 is a "conical sealing ring" that is fitted onto the outer side of the upper end of the air outlet needle fixing part 11. Its conical surface faces the top end face of the air outlet needle fixing part 11, forming a "conical surface fit" pre-sealing structure with the outer wall of the air outlet needle fixing part 11. The fixing nut 9 is a "hexagonal nut" or "round locking nut" that is screwed onto the upper external thread of the air outlet needle fixing part 11. When tightened downwards, it compresses the conical surface of the conical washer 10, causing the conical washer 10 to undergo elastic deformation and tightly fit the outer wall of the air outlet needle fixing part 11 and the inner wall of the air tube (the air tube is fitted onto the upper end of the air outlet needle fixing part), forming a sealed air passage connection of "fixing nut - conical washer - air outlet needle fixing part". All three are coaxially assembled, and their axes coincide with the axis of the air outlet needle fixing part 11.

[0036] The tracheal connection assembly (conical washer, fixing nut) is located at the upper end of the air inlet needle fixing part 4 and the air outlet needle fixing part 11, in the area above the dual-drive puncture bracket 8 and the air inlet needle puncture bracket 2 (as shown in the attached figure, it belongs to the "top air passage interface" of the structure). It is spatially vertically separated from the puncture moving parts below (pressure cap, air outlet needle, injection needle, etc.) to avoid interference between the trachea and the moving parts during puncture.

[0037] The inlet needle side air passage is used to deliver gas (such as carrier gas, drying gas, etc.) into the sample bottle, while the outlet needle side air passage is used to exit the moisture detection mixed gas in the sample bottle. The air tube connection assembly uses a sealing structure of "conical washer + fixing nut" to ensure the airtightness of the air passage during the puncture process (especially when the outlet needle punctures the bottle gasket first and the inlet needle punctures later), thus preventing moisture leakage from affecting the detection accuracy.

[0038] Optionally, it also includes a lead screw motor mounting plate 5, which is installed to the dual-drive puncture bracket 8 by screws for mounting the lead screw motor (not shown in the figure).

[0039] Specifically, the lead screw motor mounting plate 5 is a "flat" or "mounted boss" structural component. Its lower surface is in contact with the upper surface of the dual-drive puncture bracket 8, and the two are connected by at least two (usually 2-4 symmetrically distributed) screws to ensure the rigid fixation of the mounting plate and the bracket. The lead screw motor mounting plate 5 is located in the upper area of ​​the dual-drive puncture bracket 8 and belongs to the "middle-layer support component" of the structure. The upper part is used to install the lead screw motor (the drive motor of the second lead screw slide), and the lower part is connected to the air needle fixing component 11, the pressure cap trigger assembly, etc. through the dual-drive puncture bracket 8, forming a transmission link of "motor-mounting plate-bracket-puncture component".

[0040] The lead screw motor of the second lead screw slide 21 (the motor that drives the dual-drive puncture support to move up and down) has its motor base fixed to the upper surface of the lead screw motor mounting plate 5 by bolts / locating pins. The mounting plate has reserved motor mounting holes (such as circular through holes or threaded holes) to ensure that the motor output shaft is coaxial with the lead screw of the second lead screw slide, so as to achieve precise linkage of "motor drive - lead screw transmission - support movement".

[0041] The edge contour of the screw motor mounting plate 5 avoids the vertical projection area of ​​the air outlet needle fixing part 11 (from the perspective of the three-dimensional view, the mounting plate is a "avoidance" design, or the space for the air outlet needle fixing part to pass through is reserved in the central area), ensuring that the air outlet needle fixing part 11 can vertically penetrate the dual drive puncture bracket 8 without being blocked by the mounting plate, and maintaining the coaxial puncture relationship between the "air outlet needle and sample bottle".

[0042] The mounting plate acts as a "transitional connector" between the motor and the dual-drive puncture support. By increasing the contact area between the motor and the support (compared to directly mounting the motor on the support), it disperses the vibration load during motor operation, improves the stability of the linkage process of "the second lead screw slide table drives the dual-drive puncture support to descend - the pressure cap contacts the sample bottle - the vent needle punctures the bottle gasket - triggering the micro switch", and avoids the puncture position shift caused by motor vibration.

[0043] When replacing different specifications of lead screw motors (such as differences in power and size), the lead screw motor mounting plate 5 can be adjusted by adjusting the mounting hole position and adapting to different motor seats to achieve compatible assembly of "the same set of dual-drive puncture brackets + different motors", thereby improving the versatility of the structure.

[0044] Optionally, it also includes a fixing nut 14, which is fitted to the air outlet needle fixing member 11 to fix the air outlet needle 12.

[0045] Specifically, the air vent needle fixing part 11 is a "cylindrical structure with external threads", and its lower part (near the air vent needle assembly end) is machined with an external thread section; the fixing nut 14 is a "hexagonal nut" or "circular locking nut", which is screwed onto the external thread section of the air vent needle fixing part 11, and the two form a "threaded pair" connection, with the axis coinciding with the axis of the air vent needle fixing part 11.

[0046] The air-ejecting needle 12 is a "slender needle body". It is inserted into the internal through hole of the air-ejecting needle fixing part 11 along the axial direction. After the fixing nut 14 is tightened, its upper end face contacts the limiting step of the air-ejecting needle 12 (or the mating end face of the air-ejecting needle and the fixing part). Through axial clamping force, the air-ejecting needle 12 is fixed in the air-ejecting needle fixing part 11, ensuring that the air-ejecting needle 12 and the fixing part are coaxial and avoiding needle body deviation during puncture.

[0047] The fixing nut 14 is located at the lower end of the vent needle fixing component 11. The sealing gasket 13 is sleeved on the vent needle 12 and is located in the area between the fixing nut 14 and the sample bottle 22. When the fixing nut 14 is tightened, it fixes the vent needle 12 on the one hand, and on the other hand, through the indirect compression (or direct contact, depending on the design) of the "nut-vent needle fixing component end face-sealing gasket", it helps to strengthen the pre-tightening force of the sealing gasket 13, improves the sealing performance after the vent needle punctures the bottle gasket, and reduces the risk of moisture leakage.

[0048] The outer diameter of the fixing nut 14 is smaller than the diameter of the mounting hole of the air needle fixing part 11 on the dual-drive puncture bracket 8, ensuring that the fixing nut 14 will not interfere with the dual-drive puncture bracket 8 after assembly. When the dual-drive puncture bracket 8 drives the air needle fixing part 11 downward, the fixing nut 14 also moves downward, with its lower end face close to the bottle mouth of the sample bottle 22, providing "short-range support" for the air needle 12 to puncture the bottle gasket, while avoiding collision with components such as the pressure cap 17 and the guide rod 16.

[0049] The fixing nut 14 secures the vent needle 12 by axially pressing it, eliminating the gap between the vent needle 12 and the fixing component and preventing the needle from "wobbling" during puncture. Especially during the action of the vent needle 12 piercing the sample bottle pad first, the rigid constraint provided by the fixing nut 14 ensures that the vent needle 12 accurately pierces the bottle pad, and maintains the stability of the needle body and prevents it from deviating as the sample bottle 22 continues to move downward.

[0050] When the air outlet needle 12 needs to be replaced (e.g., due to needle wear or blockage), the old needle can be pulled out and the new needle inserted by loosening the fixing nut 14, and then the nut can be tightened to complete the fixation. There is no need to disassemble the complex air circuit or bracket structure, which improves the equipment maintenance efficiency. This convenience also relies on the "external thread engagement" position design of the fixing nut 14 and the air outlet needle fixing part 11.

[0051] Optionally, a guide ring 15 is provided between the guide rod 16 and the dual-drive puncture bracket 8. The guide ring 15 is threaded to the dual-drive puncture bracket 8 to provide motion guidance for the guide rod 16.

[0052] Specifically, the dual-drive puncture bracket 8 is machined with a "through hole with internal threads", and the guide ring 15 is an annular structure with "external threads on the outside and a smooth guide hole on the inside". It is screwed into the through hole of the dual-drive puncture bracket 8 by thread engagement, with the axes of the two coinciding. The external thread of the guide ring 15 is compatible with the internal thread of the bracket through hole (such as M series standard thread or custom thread).

[0053] The guide rod 16 is a slender rod-shaped structure. Its upper end is rigidly connected to the pressure cap 17 (e.g., by thread or welding), and its lower end passes through the smooth inner hole of the guide ring 15, forming a sliding pair of "guide rod-guide ring". The outer diameter of the guide rod 16 is slightly smaller than the inner hole diameter of the guide ring 15 (usually with a clearance fit, the clearance is 0.05-0.2mm, to ensure smooth sliding without obvious wobble), and the axes of the two coincide, which is consistent with the movement direction (vertical direction) of the dual-drive puncture support 8.

[0054] The guide ring 15 is located in the lower region of the dual-drive puncture support 8 (on the side near the pressure cap 17). The guide rod 16 passes through the guide ring and extends downward to connect with the pressure cap 17. When the dual-drive puncture support 8 drives the guide ring 15 downward, the guide rod 16 moves vertically under the constraint of the guide ring, ensuring that the pressure cap 17 always moves towards / away from the sample vial 22 in a vertical direction, avoiding horizontal displacement of the pressure cap 17, which would affect the accuracy of the action of "pressure cap first contacts sample vial - vent needle punctures vial gasket".

[0055] The outer thread of the guide ring 15 engages with the through-hole thread of the dual-drive puncture bracket 8, and its inner guide hole and the air needle fixing component 11 are "misaligned" in the horizontal direction (from the perspective of the three-dimensional view, the guide ring and the air needle fixing component belong to different areas of the dual-drive puncture bracket), ensuring that the movement of the guide rod 16 will not interfere with the air needle fixing component 11, the air needle 12 and other components, and maintaining the spatial compactness of the puncture structure.

[0056] During the process of "the second lead screw slide driving the dual-drive puncture stent downwards", the guide ring 15 ensures that the movement direction of the pressure cap 17 is strictly vertical by constraining the movement trajectory of the guide rod 16. In particular, when the pressure cap 17 contacts the sample bottle 22, the guide rod 16 stops due to the obstruction of the sample bottle. When the dual-drive puncture stent 8 continues to descend, the guide ring 15 slides along the guide rod 16, providing a "vertical movement reference" for the dual-drive puncture stent 8, preventing the stent from tilting during descent, and ensuring the accuracy of the action of "microswitch triggered - second lead screw slide stops".

[0057] The guide ring 15 is threadedly connected to the dual-drive puncture support 8. The vertical position of the guide ring 15 can be finely adjusted by adjusting the thread insertion depth to accommodate guide rods 16 or pressure caps 17 of different lengths. At the same time, the constraint of the guide ring 15 on the guide rod 16 distributes the horizontal load when the pressure cap 17 contacts the sample vial, preventing deformation of the pressure cap 17 and guide rod 16 due to uneven stress, and improving the long-term stability of the entire puncture structure.

[0058] Optionally, the air outlet needle fixing component 11 and the air inlet needle fixing component 4 are made of metal to ensure the stability of the puncture process.

[0059] Specifically, the specific metal materials that can be used for the air outlet needle fixing member 11 and the air inlet needle fixing member 4 include:

[0060] Stainless steel: such as 304 stainless steel, has good corrosion resistance and mechanical strength, can adapt to the water vapor environment that may exist in the moisture analyzer, and has excellent processing performance. It can be made into a high-precision assembly structure through precision turning, drilling and other processes to ensure the assembly stability of the air outlet needle and air inlet needle.

[0061] Aluminum alloys, such as 6061 aluminum alloy, have a high strength-to-weight ratio, are lightweight and have moderate hardness. After anodizing, the surface wear resistance and corrosion resistance can be improved, making them suitable for scenarios where the overall structural weight is required, while also meeting the structural strength requirements of the fasteners during puncture.

[0062] Brass: It has excellent machinability and electrical conductivity, and its smooth surface results in a low coefficient of friction when assembled with other parts, which can reduce the impact of assembly stress on the precision of fasteners. At the same time, brass has good oxidation resistance and can maintain structural stability for a long time, making it suitable as a material for precision fasteners.

[0063] Optionally, the sealing gasket 13 is made of elastic rubber, which can help maintain the sealing of the sample vial after the venting needle 12 punctures it.

[0064] Therefore, the rubber material has an extremely high elastic modulus. When the venting needle 12 punctures the sample vial gasket, the sealing gasket is squeezed between the lower end face of the venting needle fixing part 11 and the sample vial opening. At this time, the coiled structure of the rubber molecular chains is stretched, producing reversible deformation. Its surface can tightly adhere to the rough surface of the sample vial opening and the outer wall of the venting needle 12, filling the annular gap between the needle body and the gasket formed by puncture, forming a physical barrier layer to prevent gas or moisture inside the vial from leaking out through the gap. The rubber generates a lasting rebound force under pressure, which ensures that the sealing gasket always maintains contact pressure on the sample vial opening and the outer wall of the venting needle. Even if the sample vial shifts position due to vibration or slight displacement during the puncture process, the elastic rebound energy of the rubber can quickly respond and adjust the contact posture, maintaining the effective pressure of the sealing surface and avoiding seal failure caused by sudden pressure drop. Elastic rubber (such as nitrile rubber and fluororubber) has the characteristics of chemical corrosion resistance and aging resistance. It will not swell or degrade when in contact with media such as water vapor and organic solvents that may be present in the sample vial, ensuring structural stability during long-term use. At the same time, when the hole formed by the puncture needle 12 shrinks due to the elasticity of the rubber, the rubber will achieve a tiny "self-repair" through the peristalsis of the molecular chains, further reducing the gap and strengthening the sealing effect.

[0065] Optionally, it also includes a protective component surrounding the outside of the puncture-related component to prevent external debris from interfering with the puncture process.

[0066] Specifically, the protective assembly adopts a combined structure of "split frame + transparent baffle": the main frame is a U-shaped frame made of lightweight alloy (such as aluminum alloy) or high-strength engineering plastic (such as ABS). The bottom of the frame has mounting holes that fit the equipment base and is fixed to the base of the puncture mechanism with bolts. The frame height covers the vertical range from the middle of the lead screw slide to the sample bottle support platform, and the side walls and rear wall form a semi-enclosed space. The transparent baffle is made of 3mm thick acrylic sheet and is connected to the open side of the U-shaped frame by a slot or hinge. It can be opened and closed flexibly (e.g., with a magnetic lock), which facilitates the handling of sample bottles during operation and provides fully enclosed protection during puncture.

[0067] The protective components primarily surround the outer side of the following puncture-related core components:

[0068] Longitudinal coverage: Starting from the lower middle part of the first lead screw slide 20 and the second lead screw slide 21, extending downward to the bearing area of ​​the sample bottle 22, completely surrounding the puncture interaction area of ​​the air inlet needle puncture bracket 2, the dual-drive puncture bracket 8, the air outlet needle 12, the injection needle 6 and the sample bottle 22.

[0069] Lateral isolation: The inner wall of the frame maintains a safe gap of 5-10mm with the puncture components to avoid interference with the moving stent (such as when the dual-drive puncture stent is descending). At the same time, the exposed parts of the endotracheal connection components (conical washers, fixing nuts) are also included in the protection range to prevent external debris from falling at the airway interface.

[0070] The three-dimensional space formed by the enclosed frame and the transparent baffle can prevent dust in the air and fine particles in the operating environment (such as sample powder and fiber impurities) from falling directly into the puncture contact point between the air outlet needle 12 and the sample bottle 22, as well as the needle tip area of ​​the injection needle 6, thus avoiding puncture position displacement or needle blockage caused by impurity adhesion.

[0071] Inclined guide ribs can be installed on the inner wall of the frame. When the protective components are closed, a relatively stable airflow environment is formed inside, reducing the movement of debris caused by external airflow disturbance. Especially in the laboratory environment of the moisture analyzer, it can effectively isolate the dust airflow brought by the ventilation system.

[0072] The transparent baffle's visual design does not affect the observation of the puncture process, and it also reminds the operator to keep the protective components closed during the puncture stage, thus preventing human touch or foreign objects such as pens and paper scraps from falling in, forming a dual protection mechanism.

[0073] Preferably, the protective component is provided with an observation window to facilitate the operator's observation of the puncture operation status. Specifically, the observation window can be located on the aforementioned transparent baffle.

[0074] Optionally, both the first lead screw slide 20 and the second lead screw slide 21 are equipped with position sensors to provide feedback on the slide's running position and to help control the puncture depth.

[0075] Specifically, for the first lead screw slide 20: the position sensor is installed on the side of the lead screw end away from the drive motor, and its detection end is coaxially connected to the non-drive end of the lead screw, or linked with the drive gear of the lead screw through a gear meshing structure; at the same time, a sensing plate is installed on the side of the component that fixes the sliding seat of the slide to the air inlet needle puncture bracket 2, and the sensor body is fixed on the fixed base of the slide, so that the sensing plate is within the detection range of the sensor. For the second lead screw slide 21: the installation position is symmetrical to that of the first lead screw slide, and the position sensor is also assembled on the end of the lead screw or associated with the lead screw through a transmission structure. A sensing plate is correspondingly installed on the side of the sliding seat (connected to the dual-drive puncture bracket 8) to ensure that the sensor can capture the displacement changes of the sliding seat in real time.

[0076] The position sensor preferably uses a magnetic grating sensor or an optical grating sensor, and the specific principle is as follows:

[0077] Magnetic grating sensor: A steel strip with equidistant magnetic signals is installed on the non-drive section of the lead screw or the fixed base of the slide table. The reading head on the slide table has a built-in magnetic sensitive element such as a Hall element. When the slide table is running, the reading head moves relative to the magnetic grating, and the displacement is calculated by identifying the change in the magnetic signal. The accuracy can reach 0.01mm, which can accurately reflect the real-time position of the slide table.

[0078] The grating sensor consists of a grating ruler (a glass ruler with equidistant grating lines) and a grating reading head. The grating ruler is fixed to the slide base, and the reading head is mounted on the slide. When the slide moves, the grating lines generate moiré fringes. The reading head converts the fringe changes into electrical signals through photoelectric elements. After processing, the displacement data is output with an accuracy of up to 0.001 mm, making it suitable for scenarios with extremely high requirements for puncture depth.

[0079] To implement the position feedback mechanism, when the first lead screw slide 20 drives the air inlet needle puncture bracket 2 downward, the position sensor transmits the displacement data of the slide seat to the controller (such as a PLC or microcontroller) in real time. The controller calculates the current puncture depth of the air inlet needle based on the difference between the initial position (slide origin) and the real-time position. Similarly, the second lead screw slide 21 provides real-time feedback on the downward distance of the dual-drive puncture bracket 8, indirectly reflecting the puncture position of the air needle 12.

[0080] To achieve depth control logic, for the air needle 12: the controller presets the slide position threshold when the micro switch 19 is triggered, which is the standard puncture depth of the air needle. When the position sensor detects that the displacement of the second lead screw slide 21 reaches the threshold and the micro switch trigger signal is transmitted synchronously, the controller determines that the air needle has been punctured and immediately stops the slide to avoid over-puncture.

[0081] For the injection needle 6, the operator can preset the required puncture depth through the equipment interface, such as 5mm, 10mm, etc. for different samples. When the first lead screw slide 20 is running, the position sensor provides real-time feedback on the displacement. When the actual depth reaches the preset value, the controller issues a stop command, so that the injection needle stops precisely at the target position.

[0082] The abnormality compensation function will trigger an alarm and stop the puncture action if the position sensor detects that the deviation between the slide displacement and the preset depth exceeds the allowable range (such as ±0.1mm). This will prevent depth loss due to mechanical errors or component wear and further ensure puncture accuracy.

[0083] Optionally, the injection needle 6 is made of hard alloy material to ensure that the puncture accuracy is maintained after multiple punctures.

[0084] Optionally, the micro switch 19 is a waterproof micro switch, suitable for the operating environment of the moisture analyzer.

[0085] Optionally, the inner ring of the guide ring 15 is provided with a lubricating coating to reduce the friction of the guide rod 16 during movement.

[0086] Optionally, the lead screw motor mounting plate 5 is provided with a motor vibration damping pad to reduce the vibration transmission during the operation of the lead screw motor.

[0087] Specifically, the motor damping pads are located between the lead screw motor and the lead screw motor mounting plate 5, forming a ring-shaped or symmetrically distributed block structure. Specifically, on the upper surface of the lead screw motor mounting plate 5, corresponding to the mounting holes of the lead screw motor base, damping pads (usually four, arranged in a rectangular or square pattern) are embedded in each hole. Each damping pad has a through hole in its center, aligned with the mounting holes of the mounting plate and motor base. Bolts passing through these through holes sequentially fix the motor, damping pads, and mounting plate, forming an elastic isolation layer between the motor base and the mounting plate. Furthermore, the outer diameter of the damping pads is slightly larger than the diameter of the mounting holes in the motor base, and the thickness is typically 3-5 mm. Its upper and lower surfaces are tightly fitted to the lower surface of the motor base and the upper surface of the mounting plate, respectively. This design ensures that radial and axial vibrations generated during lead screw motor operation are first buffered by the elastic deformation of the damping pads (such as the compression and rebound of rubber), and then transmitted to the dual-drive puncture bracket 8 via the mounting plate, preventing vibration from being directly transmitted to the puncture components through a rigid connection.

[0088] In addition, the distribution of the shock-absorbing pads on the mounting plate must correspond to the center of gravity of the motor, that is, be symmetrically arranged along the motor axis to prevent vibration amplification caused by uneven force. By blocking the rigid vibration transmission path of "motor-mounting plate-bracket", the shock-absorbing pads can effectively attenuate the high-frequency vibration of the lead screw motor during operation, especially reducing the positional displacement of the air outlet needle 12 and the injection needle 6 caused by motor vibration during puncture, thus ensuring puncture accuracy.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A puncture-sealing structure for use in a moisture analyzer, characterized in that, include: The air-inlet needle puncture bracket (2) and the dual-drive puncture bracket (8) are respectively adapted to the first lead screw slide (20) and the second lead screw slide (21). The air-inlet needle puncture bracket (2) is fixed to the first lead screw slide (20), and the dual-drive puncture bracket (8) is fixed to the second lead screw slide (21). An air needle fixing component (11) is assembled on the dual-drive puncture bracket (8), and an air needle (12) and a sealing gasket (13) are sequentially assembled to the air needle fixing component (11). A pressure cap (17) and a guide rod (16) are assembled to the pressure cap (17), and a switch fixing part (18) and a micro switch (19) are assembled to the pressure cap (17) in sequence. An air inlet needle fixing component (4) is assembled on the air inlet needle puncture bracket (2), and a sample injection needle (6) passes through the air inlet needle fixing component (4) and the fine needle seal (7). The fine needle seal (7) is assembled to the air outlet needle fixing component (11).

2. The puncture-sealing structure for a moisture analyzer according to claim 1, characterized in that, It also includes a tracheal connection assembly, which includes a conical washer (3) and a fixing nut (1) connected to the air inlet needle fixing member (4), and a conical washer (10) and a fixing nut (9) connected to the air outlet needle fixing member (11), for fixing the tracheal tube to establish the air passage.

3. The puncture-sealing structure for a moisture analyzer according to claim 1, characterized in that, It also includes a lead screw motor mounting plate (5), which is installed to the dual-drive puncture bracket (8) by screws for fitting and installing the lead screw motor.

4. The puncture-sealing structure for a moisture analyzer according to claim 1, characterized in that, It also includes a fixing nut three (14) which is assembled on the air outlet needle fixing member (11) to fix the air outlet needle (12).

5. The puncture-sealing structure for a moisture analyzer according to claim 1, characterized in that, A guide ring (15) is provided between the guide rod (16) and the dual-drive puncture bracket (8). The guide ring (15) is threaded to the dual-drive puncture bracket (8) to provide motion guidance for the guide rod (16).

6. The puncture-sealing structure for a moisture analyzer according to claim 1, characterized in that, The air outlet needle fixing component (11) and the air inlet needle fixing component (4) are made of metal to ensure the stability of the puncture process.

7. The puncture-sealing structure for a moisture analyzer according to claim 1, characterized in that, The sealing gasket (13) is made of elastic rubber and can help maintain the sealing of the sample bottle after the air needle (12) punctures it.

8. The puncture-sealing structure for a moisture analyzer according to any one of claims 1-7, characterized in that, Also includes: A protective component surrounds the outside of the puncture-related parts to prevent external debris from interfering with the puncture process.

9. The puncture-sealing structure for a moisture analyzer according to claim 8, characterized in that, The protective component is equipped with an observation window, which allows operators to easily check the puncture operation status.

10. The puncture-sealing structure for a moisture analyzer according to any one of claims 1-7, characterized in that, Both the first lead screw slide (20) and the second lead screw slide (21) are equipped with position sensors to provide feedback on the slide's running position and to help control the puncture depth.

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