Sampling needle
By wrapping the sampling needle with a thickened needle wall and fitting it into the connecting seat to form a mechanical transmission chain, the vibration problem of the sampling needle during high-speed start-up, shutdown, or direction switching is solved, thus achieving stable liquid delivery and convenient sampling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-27
AI Technical Summary
Existing sampling needles are prone to vibration during high-speed start-up, shutdown, or directional switching, causing liquid to be ejected from the needle tip.
A thickened needle wall is wrapped around the outside of the needle, and a connector is embedded in one end, while the other end is separated from the needle tip to form a mechanical transmission chain, which enhances rigidity and disperses inertial force.
It effectively prevents vibration of the sampling needle during high-speed start-up, shutdown, or direction switching, avoids liquid splashing, maintains sampling convenience, and reduces the risk of resonance.
Smart Images
Figure CN224051687U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sampling technical field, concretely relates to a sampling needle. BACKGROUND
[0002] The liquid sample processing workstation is an automatic laboratory equipment, which can be used for distribution, mixing, dilution and other related operations of liquid sample. Among them, the sampling needle is an essential basic component of the liquid sample processing workstation, which is used for extracting or injecting liquid and moving by the mechanical arm control. However, the existing sampling needle is usually thin and long, and the rigidity is insufficient, when the mechanical arm controls the high-speed start-stop or direction switching of the sampling needle, the needle body is easy to vibrate, and the liquid at the needle tip opening is easy to be thrown out. SUMMARY
[0003] The utility model discloses a kind of sampling needles, thick needle wall is set by wrapping outside needle body, and one end of thick needle wall is embedded into connecting seat, the other end is kept interval distance with needle tip section, so it can effectively improve the rigidity of needle body, so as to prevent sampling needle from vibrating when high-speed start-stop or direction switching, avoid the liquid at the needle tip opening being thrown out.
[0004] The utility model provides a kind of sampling needle, the sampling needle includes needle body, one end of the needle body is provided with connecting seat, the other end of the needle body is formed with needle tip section, the connecting seat, the needle body and the needle tip section are communicated;Thick needle wall is set by wrapping outside the needle body, one end of thick needle wall is embedded into the connecting seat, and there is interval between the other end of thick needle wall and the needle tip section.
[0005] Specifically, the wall thickness of the needle body is H1, the wall thickness of the thick needle wall is H2, and the constraint relationship between H1 and H2 is 2H1≤H2≤3H1.
[0006] Specifically, the wall thickness of the needle body is in the range of 0.5-1.0 mm, and the wall thickness of the thick needle wall is in the range of 1.0-3.0 mm.
[0007] Specifically, the needle body and the needle tip section are connected based on a conical transition section.
[0008] Specifically, the distance from the thick needle wall to the conical transition section is in the range of 1.0-1.5 cm.
[0009] Specifically, the length of the needle body is L1, the length of the needle tip section is L2, and the constraint relationship between L1 and L2 is 5L2≤L1≤6L2.
[0010] Specifically, the length of the needle body is in the range of 10-18 cm, and the length of the needle tip section is in the range of 2-3 cm.
[0011] Specifically, the inner diameter of the needle body ranges from 2.5mm to 3.5mm, and the inner diameter of the needle tip section ranges from 1.0mm to 1.5mm.
[0012] Specifically, the connecting seat extends towards the needle tip section to form a reinforced handle seat, the length of the reinforced handle seat ranges from 2cm to 3cm, and the thickness of the reinforced handle seat ranges from 3mm to 5mm.
[0013] Specifically, the sampling needle is a stainless steel needle.
[0014] Compared with the prior art, the sampling needle has the following beneficial effects:
[0015] The sampling needle of the utility model, through setting up thickened needle wall to wrap needle body, can directly and effectively improve the rigidity of needle body, thereby can effectively prevent sampling needle from vibrating when starting or stopping at high speed or switching direction, avoids liquid at needle tip opening being thrown out, moreover, through the embedded connection of connecting seat and thickened needle wall, forming mechanical transmission chain, can disperse and conduct inertia force generated when starting or stopping at high speed or switching direction from needle tip section to connecting seat, thereby is favorable for reducing the vibration of needle tip section, also avoids liquid at needle tip opening being thrown out, simultaneously, the interval design of thickened needle wall and needle tip section can make needle tip section keep slender state, thereby guarantees the sampling convenience of sampling needle. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.
[0017] Figure 1 It is the overall cross-sectional structure schematic diagram of the sampling needle in the embodiment of the utility model;
[0018] Figure 2 It is the local cross-sectional structure schematic diagram of the sampling needle in the embodiment of the utility model.
[0019] In the drawings, 100, needle body;101, flow channel;110, round blunt convex;200, connecting seat;210, reinforced handle seat;300, needle tip section;400, thickened needle wall;500, conical transition section. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.
[0021] The utility model provides a sampling needle, Figure 1 The utility model discloses a whole cross section structure schematic diagram of sampling needle is shown, the sampling needle is including needle body 100, one end of needle body 100 is provided with connecting seat 200, the other end of needle body 100 is shaped and has needle tip section 300, connecting seat 200, needle body 100 with needle tip section 300 intercommunication, needle body 100 is wrapped up and is provided with thickened needle wall 400, one end of thickened needle wall 400 is embedded into connecting seat 200, and there is interval between the other end of thickened needle wall 400 and needle tip section 300.
[0022] The utility model discloses a sampling needle, by setting up thickened needle wall 400 and wrapping needle body 100, can directly effectively improve the rigidity of needle body 100, thereby can effectively prevent sampling needle from vibrating when high speed starts or direction switches, avoids the liquid at needle tip mouth to be thrown out, and moreover, through the embedded connection of connecting seat 200 and thickened needle wall 400, forms the mechanical transmission chain, can disperse the inertial force generated when high speed starts or direction switches from needle tip section 300 to connecting seat 200, thereby is favorable to reduce the vibration of needle tip section 300, also avoids the liquid at needle tip mouth to be thrown out, thickened needle wall 400 and needle tip section 300 interval design can make needle tip section 300 keep the state of being slender, thereby guarantee the sampling convenience of sampling needle.
[0023] In some specific embodiments, the wall thickness of the needle body 100 is H1, the wall thickness of the thickened needle wall 400 is H2, and the constraint relationship between H1 and H2 is 2H1≤H2≤3H1. This wall thickness constraint relationship between the needle body 100 and the thickened needle wall 400 can suppress vibration under a typical mechanical arm acceleration of 500-1000 mm / s 2 , and can also avoid excessive thickness of the thickened needle wall 400 increasing the mass burden of the sampling needle.
[0024] Specifically, the wall thickness of the needle body 100 is in the range of 0.5-1.0 mm, ensuring that the needle body 100 has sufficient basic strength to wrap the thickened needle wall 400. The wall thickness of the thickened needle wall 400 is in the range of 1.0-3.0 mm, which can effectively improve the rigidity of the needle body 100, so that the sampling needle can cope with the working strength of the existing liquid sample processing work station.
[0025] In some embodiments, referring to Figure 1 The needle body 100 and the needle tip section 300 are connected based on the tapered transition section 500, which can avoid stress concentration caused by a right-angle connection and reduce the risk of metal fatigue, and can change the resonance frequency to avoid the motion frequency range of the mechanical arm and avoid resonance between the sampling needle and the moving mechanical arm.
[0026] In addition, the thickened needle wall 400, the needle body 100, the tapered transition section 500, and the needle tip section 300 form a gradient region with gradually decreasing diameters, which enhances the stiffness of the needle body 100 while ensuring the convenience of sampling of the needle tip section 300.
[0027] In some embodiments, the distance from the thickened needle wall 400 to the tapered transition section 500 ranges from 1.0 to 1.5 cm. If the distance from the thickened needle wall 400 to the tapered transition section 500 is less than 1.0 cm, the thickened needle wall 400 is likely to interfere with the work of the needle tip section 300 and hinder the needle tip section 300 from deepening into the container. If the distance from the thickened needle wall 400 to the tapered transition section 500 is greater than 1.5 cm, it will increase the risk of vibration of the needle tip section 300.
[0028] In some embodiments, the length of the needle body 100 is L1, and the length of the needle tip section 300 is L2, and the constraint relationship between L1 and L2 is 5L2≤L1≤6L2. This length constraint relationship between the needle body 100 and the needle tip section 300 can ensure the dominant position of the needle body 100 region in stiffness, while limiting the mass concentration of the needle tip section 300 to avoid excessive inertia of the needle tip section 300, which can effectively prevent the needle tip section 300 from vibrating during high-speed start-stop or direction switching.
[0029] Specifically, the length of the needle body 100 ranges from 10 to 18 cm, and the length of the needle tip section 300 ranges from 2 to 3 cm, which can make the natural frequency of the sampling needle avoid the driving frequency of the liquid sample processing workstation, further avoiding resonance between the sampling needle and the mechanical arm.
[0030] In some embodiments, the inner diameter of the needle body 100 ranges from 2.5 to 3.5 mm, and the inner diameter of the needle tip section 300 ranges from 1.0 to 1.5 mm. The 2.5-3.5 mm inner diameter of the needle body 100 controls the shear rate in the range of 100-1000 s -1 The 1.0-1.5 mm inner diameter of the needle tip section 300 produces appropriate flow resistance (50-150 kPa·s / m3), which is beneficial to prevent shear denaturation of biological samples.
[0031] In some embodiments, referring to Figure 1The connecting seat 200 extends to the direction of the needle tip section 300 to form a reinforcing handle seat 210, the length of the reinforcing handle seat 210 ranges from 2cm to 3cm, and the thickness of the reinforcing handle seat 210 ranges from 3mm to 5mm; the reinforcing handle seat 210 forms a mechanical interference fit through the extension length of 2cm to 3cm and the thickness of 3mm to 5mm, so that the pull-off force of the connecting part is increased from 50N in the traditional design to 200N, which not only effectively ensures the connecting strength of the connecting seat 200 and the thickened pipe wall, but also effectively reduces the vibration risk of the needle body 100.
[0032] In some specific embodiments, the sampling needle is a stainless steel needle, which is solid and durable. Specifically, the outer surface of the stainless steel needle is plated with a titanium alloy layer, which can further improve the corrosion resistance of the sampling needle
[0033] In some specific embodiments, the outer surface of the connecting seat 200 is formed with straight grain knurling, which increases the surface friction of the connecting seat 200, prevents slipping, and facilitates people to hold the connecting seat 200 to install the sampling needle into the liquid sample processing work station.
[0034] Specifically, the inner surface of the connecting seat 200 is formed with internal threads, which can be tightened on the corresponding joint, and has good installation stability.
[0035] In some specific embodiments, the end of the needle tip section 300 is flat, which avoids puncturing the container.
[0036] In some specific embodiments, the gap between the thickened needle wall 400 and the needle body 100 is filled with nickel-based filler, which prevents liquid from entering the inside of the thickened needle wall 400.
[0037] Figure 2 A partial cross-sectional structure schematic view of the sampling needle in the embodiment of the utility model is shown, the needle body 100 is formed with a flow channel 101, at least one round blunt protrusion 110 is formed in the flow channel 101, the round blunt protrusion 110 can destroy the laminar boundary layer, can reduce the adhesion of liquid on the inner wall of the flow channel 101, thereby being beneficial to reducing the residue of high viscosity liquid (such as high molecular solution).
[0038] Specifically, the height of the round blunt protrusion 110 ranges from 1mm to 1.5mm, if the height of the round blunt protrusion 110 is less than 1mm, the round blunt protrusion 110 cannot play a role; if the height of the round blunt protrusion 110 is greater than 1.5mm, the round blunt protrusion 110 is difficult to process.
[0039] Further, referring to Figure 2 Two round blunt protrusions 110 are provided, the two round blunt protrusions 110 are distributed in an interlaced manner, and the round blunt protrusions 110 have a good effect of destroying the laminar boundary layer.
[0040] The sampling needle of the utility model, through setting up the thickened needle wall 400 to wrap the needle body 100, can directly and effectively improve the rigidity of the needle body 100, thereby can effectively prevent the sampling needle from vibrating when starting or stopping at high speed or switching direction, avoids the liquid at the needle tip opening being thrown out; moreover, through the embedded type connection of the connecting seat 200 and the thickened needle wall 400, the mechanical transmission chain is formed, the inertia force generated when starting or stopping at high speed or switching direction can be dispersed and conducted from the needle tip section 300 to the connecting seat 200, thereby is favorable for reducing the vibration of the needle tip section 300, also avoids the liquid at the needle tip opening being thrown out; simultaneously, the interval design of the thickened needle wall 400 and the needle tip section 300 can make the needle tip section 300 keep the state of being thin, thereby guarantees the sampling convenience of the sampling needle.
[0041] In addition, the inherent frequency of the sampling needle of the utility model can avoid the driving frequency of the liquid sample processing work station, thereby avoids the resonance of the sampling needle and the mechanical arm.
[0042] The above has carried out the detailed introduction to the sampling needle provided by the utility model embodiment, the principle and implementation mode of the utility model have been described in this paper by using specific examples, the above embodiment is only for helping understanding the method and core idea of the utility model; simultaneously, for the general technical personnel in the art, according to the idea of the utility model, the specific implementation mode and application range will have the change, and the above-mentioned, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A sampling needle characterized by, The sampling needle comprises a needle body, one end of the needle body is provided with a connecting seat, the other end of the needle body is shaped with a needle tip section, the connecting seat, the needle body and the needle tip section are communicated; the needle body is wrapped with a thickened needle wall, one end of the thickened needle wall is embedded into the connecting seat, and the other end of the thickened needle wall is spaced from the needle tip section.
2. The sampling needle of claim 1, wherein, The wall thickness of the needle body is H1, the wall thickness of the thickened needle wall is H2, and the constraint relationship between H1 and H2 is 2H1≤H2≤3H1.
3. The sampling needle of claim 1 or 2, wherein, The wall thickness of the needle body ranges from 0.5 to 1.0 mm, and the wall thickness of the thickened needle wall ranges from 1.0 to 3.0 mm.
4. The sampling needle of claim 1, wherein, The needle body and the needle tip section are connected based on a conical transition section.
5. The sampling needle of claim 4, wherein, The distance of the thickened needle wall to the conical transition section ranges from 1.0 to 1.5 cm.
6. The sampling needle of claim 1, wherein, The length of the needle body is L1, the length of the needle tip section is L2, and the constraint relationship between L1 and L2 is 5L2≤L1≤6L2.
7. The sampling needle of claim 1 or 6, wherein, The length of the needle body ranges from 10 to 18 cm, and the length of the needle tip section ranges from 2 to 3 cm.
8. The sampling needle of claim 1, wherein, The inner diameter of the needle body ranges from 2.5 to 3.5 mm, and the inner diameter of the needle tip section ranges from 1.0 to 1.5 mm.
9. The sampling needle of claim 1, wherein, The connecting seat extends towards the needle tip section to form a reinforced handle seat, the length of the reinforced handle seat ranges from 2 to 3 cm, and the thickness of the reinforced handle seat ranges from 3 to 5 mm.
10. The sampling needle of claim 1, wherein, The sampling needle is a stainless steel needle.