CN112345784A - Sample adding needle, needle withdrawing mechanism used for sample adding needle and needle installing and withdrawing method - Google Patents
Sample adding needle, needle withdrawing mechanism used for sample adding needle and needle installing and withdrawing method Download PDFInfo
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- CN112345784A CN112345784A CN202011136044.9A CN202011136044A CN112345784A CN 112345784 A CN112345784 A CN 112345784A CN 202011136044 A CN202011136044 A CN 202011136044A CN 112345784 A CN112345784 A CN 112345784A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
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Abstract
The invention relates to a sample adding needle, a needle withdrawing mechanism used for the sample adding needle and a mounting and needle withdrawing method, belonging to the technical field of sample adding needles.
Description
Technical Field
The invention relates to a sample adding needle, a needle withdrawing mechanism used for the sample adding needle and a needle installing and withdrawing method, and belongs to the technical field of sample adding needles.
Background
The application of sample needle is the more commonly used part in biochemical analysis appearance, mainly used moves and gets a small amount or trace liquid, generally adopt two kinds of modes during the installation of electrically conductive application of sample needle among the prior art, one kind is utilizing the motor to clamp the application of sample needle with the compression of O type circle, another kind is inserting the application of sample needle directly hard into, it is fixed to the application of sample needle to lean on the frictional force between O type circle and the application of sample needle, in addition, generally adopt the motor to loosen the O type circle when withdrawing the needle to this application of sample needle and realize dismantling the application of sample needle, or directly rely on the motor to push down the application of sample needle hard, above-mentioned two kinds of structures have O type circle tight structure complicated, with high costs, easily take place not hard up and drop, direct hard cartridge is unloaded power greatly, cause the defect of impact to the pipettor move, and produce the equipment damage life weak point easily.
Disclosure of Invention
The invention provides a sample adding needle, a needle withdrawing mechanism for the sample adding needle and a mounting and needle withdrawing method aiming at the defects in the prior art, and aims to solve the technical problems that the sample adding needle and the needle withdrawing mechanism in the prior art are large in loading and unloading force and poor in safety and sealing performance due to the fact that the structure is easy to damage.
The technical scheme for solving the technical problems is as follows: the utility model provides a sample adding needle, includes needle body and needle cap, needle body and needle cap all set up to the tubulose, the internal diameter of needle cap is greater than the internal diameter of needle body, and the connecting portion of needle cap and needle body set up to the back taper, set up a plurality of through-hole on the needle cap lateral wall, installation elasticity portion in this through-hole, the body of elasticity portion sets up to platelike, the top of body and the roof integrated into one piece of through-hole, and the bottom of body is inside the needle cap for free end and body along the projection of needle cap axis direction.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the included angle between the elastic part and the outer circumferential tangent plane of the needle cap is 9-13 degrees.
Further, the quantity of through-hole is three, and is the annular array about the central axis of application of sample needle, and conductive plastic is chooseed for use to the material of this application of sample needle, the needle body bottom sets up to the toper.
The utility model provides a move back needle mechanism for application of sample needle, this move back needle mechanism and be used for moving back the needle to the application of sample needle, move back needle mechanism and include the axle sleeve subassembly, install buckle syringe needle, the concentric installation in axle sleeve subassembly bottom move back the needle bar and slidable mounting at the outside elastic needle bar of moving back the needle bar of axle sleeve subassembly, this buckle syringe needle sets up the sealing washer mounting groove that is used for installing the sealing washer and the back taper platform that is used for moving back the needle bar with the elasticity portion joint of application of sample needle, and the back taper platform is located sealing washer mounting groove top, and the biggest external diameter of this back taper platform is less than the internal diameter of needle cap, is greater than the diameter of elasticity portion bottommost along axis projection place minimum circle and moves back the internal diameter of needle bar bottom, the bottom external diameter of moving back the needle bar is less than the needle cap external diameter.
Furthermore, the bottom of the needle withdrawing rod is provided with a step platform, a spring is sleeved on the step platform, and the elastic needle rod is slidably mounted on the step platform and is contacted with the bottom of the spring.
Further, move back needle bar bottom lateral wall and set up at least one rectangular hole groove, the bullet needle bar lateral wall runs through fixed mounting bullet needle cover round pin, bullet needle cover round pin slidable mounting in rectangular hole groove.
Further, the shaft sleeve assembly comprises a first assembly and a second assembly which are both arranged as pipe fittings, and the bottom of the first assembly is in interference fit with the top of the second assembly and is in adhesive connection with the top of the second assembly.
Further, the side wall sets up the recess that is used for placing the conductor wire on the subassembly one, subassembly one adopts stainless steel material, subassembly two adopts non-conductive material to make.
Furthermore, the bottom of the second component is in threaded connection with the top of the buckling needle.
A method for installing and withdrawing a sample adding needle comprises the following steps: (1) installation: the needle cap of the sample adding needle concentrically slides upwards along the bottom of the buckle needle head, the inverted cone of the buckle needle head stretches the free end of the elastic part outwards until the free end of the elastic part slides to the upper part of the inverted cone, the elastic part is restored and clamped on the upper surface of the inverted cone, the sealing ring on the buckle needle head is pressed against the connecting part of the needle cap and the needle body, the top of the needle cap extrudes the elastic needle rod to enable the elastic needle rod to slide upwards along the needle withdrawing rod, and the spring is compressed to realize the installation and fixation of the sample adding needle; (2) withdrawing the needle: the top of axle sleeve subassembly is fixed, moves back the needle pole and slides downwards under the effect of external force, acts on elasticity portion and outwards struts its back taper platform until elasticity portion breaks away from the buckle syringe needle, and under the effect of spring elasticity, the bullet needle pole slides downwards along the rectangular hole groove of moving back the needle bar through bullet needle cover round pin, and the bullet needle of playing the sample needle leaves the buckle syringe needle to accomplish the action of moving back the needle of sample needle.
The invention has the beneficial effects that: the elastic part is arranged on the needle cap of the sample adding needle, so that the rapid installation and disassembly of the sample adding needle are facilitated, the structure is convenient to process and manufacture, the complexity and the cost of a production process are reduced, the connecting part is convenient to be tightly matched with a sealing ring on a buckle needle head during installation, the sealing safety is improved, the maximum elasticity of the elastic part is facilitated to be exerted by adopting a specific angle, the rapid installation and disassembly of the sample adding needle are achieved, and the assembly and disassembly efficiency is improved; by arranging the needle withdrawing mechanism, the needle withdrawing rod acts on the elastic part to realize the quick disassembly of the sample adding needle during needle withdrawing by virtue of the needle withdrawing rod and the elastic needle rod, and the elastic needle rod and the spring are utilized to realize the quick rebound of the elastic needle rod; the elastic needle rod and the needle withdrawing rod provide a guiding function for the reciprocating motion of the elastic needle rod through the elastic needle sleeve pin, so that the safety and the stability of the operation are improved; through setting up the axle sleeve subassembly, assemble subassembly one and subassembly two, adopt different materials respectively, realize respective function, the installation of being convenient for.
Drawings
FIG. 1 is a front view of a sample addition needle;
FIG. 2 is a perspective view of a loading needle;
FIG. 3 is a front view of the present invention;
FIG. 4 is a right side view of the present invention;
FIG. 5 is a schematic sectional view of the sample injection needle installed at A-A in FIG. 4;
FIG. 6 is a schematic view of FIG. 5 with the loading needle removed;
FIG. 7 is an enlarged partial view of FIG. 5 at B;
FIG. 8 is an enlarged partial view at C of FIG. 6;
fig. 9 is a schematic partial cross-sectional view taken at D-D in fig. 3.
In the figure, 1, a component I, 2, a needle withdrawing rod, 3, a component II, 4, a spring, 5, a needle ejecting rod, 6, a buckle needle head, 7, a sealing ring, 8, a sample adding needle, 9, a needle ejecting sleeve pin, 10, a long strip hole groove, 11, a groove, 12, an inverted cone, 81, a needle body, 82, a needle cap, 83, an elastic part, 84, a through hole and 85 are connected.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The utility model provides a sample adding needle, includes needle body 81 and needle cap 82, needle body 81 and needle cap 82 all set up to the tubulose, the internal diameter of needle cap 82 is greater than the internal diameter of needle body 81, and the connecting portion 85 of needle cap 82 and needle body 81 sets up to the back taper, set up three through-hole 84 on the needle cap 82 lateral wall, and be annular array about the central axis of sample adding needle, electrically conductive plastics are chooseed for use to the material of this sample adding needle, needle body 81 bottom sets up to the toper, installation elasticity portion 83 in this through-hole 84, and the body of elasticity portion 83 sets up to platelike, and the top of body and the roof integrated into one piece of through-hole 84, and the bottom of body is inside needle cap 82 for free end and body along the projection of needle. The contained angle between the outer circumference tangent plane of elasticity portion 83 and needle cap 82 is 9-13, through set up elasticity portion 83 on the needle cap 82 at the application of sample needle, be favorable to realizing quick installation and the dismantlement of application of sample needle, the structure is convenient for manufacturing, reduce production technology complexity and cost, through setting up connecting portion 85, closely cooperate with sealing washer 7 on the buckle syringe needle 6 when being convenient for install, improve sealed security, through adopting specific angle, be favorable to exerting the biggest elasticity of elasticity portion 83, realize the fast loading and unloading of application of sample needle, improve handling efficiency.
A needle withdrawing mechanism for the sample adding needle is used for withdrawing the needle of the sample adding needle and comprises a shaft sleeve component, a buckle needle head 6 arranged at the bottom of the shaft sleeve component, a needle withdrawing rod 2 concentrically arranged outside the shaft sleeve component and a needle ejecting rod 5 slidably arranged outside the needle withdrawing rod 2, wherein the buckle needle head 6 is provided with a sealing ring mounting groove for mounting a sealing ring 7 and an inverted cone 12 clamped with an elastic part 83 of the sample adding needle, the inverted cone 12 is positioned above the sealing ring mounting groove, the maximum outer diameter of the inverted cone 12 is smaller than the inner diameter of the needle cap 82 and is larger than the diameter of the smallest circle where the elastic part 83 is projected along the axis and the inner diameter of the bottom of the needle withdrawing rod 2, the outer diameter of the bottom of the needle withdrawing rod 2 is smaller than the outer diameter of the needle cap 82 of the sample adding needle, a sealing ring 7 is arranged between the mounting groove of the buckle needle head 6 and a connecting part 85 of the, through setting up the needle withdrawing mechanism, by withdrawing needle bar 2 and bullet needle pole 5, withdraw needle bar 2 and act on the quick dismantlement that elasticity portion 83 realized the application of sample needle when withdrawing the needle, utilize bullet needle bar 5 and spring 4 to realize springback fast of bullet needle bar 5.
The bottom of the needle withdrawing rod 2 is provided with a step platform, the step platform is sleeved with a spring 4, and the needle ejecting rod 5 is slidably mounted on the step platform and is contacted with the bottom of the spring 4. Move back 2 bottom lateral walls of needle bar and set up two rectangular hole grooves 10, the 5 lateral walls of needle bar of bullet run through fixed mounting bullet needle cover round pin 9, bullet needle cover round pin 9 slidable mounting in rectangular hole groove 10, and bullet needle bar 5 and move back to provide the guide effect for the reciprocating motion of bullet needle bar 5 through bullet needle cover round pin 9 between the needle bar 2, improve the safety and stability nature of operation.
The shaft sleeve assembly comprises a first assembly 1 and a second assembly 3 which are both arranged as pipe fittings, and the bottom of the first assembly 1 is in interference fit with the top of the second assembly 3 and is in adhesive connection with the top of the second assembly. The side wall sets up the recess 11 that is used for placing the conductor wire on subassembly 1, subassembly 1 adopts stainless steel material, subassembly two 3 adopt non-conductive material to make, and the preferred PEEK (polyether ether ketone) of non-conductive material. The bottom of the second component 3 is in threaded connection with the top of the buckle needle 6, the first component 1 and the second component 3 are assembled by arranging the shaft sleeve component, different materials are adopted respectively, respective functions are realized, and the installation is convenient.
A method for installing and withdrawing a sample adding needle comprises the following steps: (1) installation: the needle cap 82 of the sample adding needle concentrically slides upwards along the bottom of the buckle needle head 6, the reverse cone 12 of the buckle needle head 6 expands the free end of the elastic part 83 outwards until the free end of the elastic part 83 slides to the upper part of the reverse cone 12, the elastic part 83 is restored and clamped on the upper surface of the reverse cone 12, the sealing ring 7 on the buckle needle head 6 is pressed on the connecting part 85 of the needle cap 82 and the needle body 81, the top of the needle cap 82 extrudes the elastic needle rod 5 to enable the elastic needle rod to slide upwards along the needle withdrawing rod 2, and the spring 4 is compressed to realize the installation and fixation of the sample adding needle; (2) withdrawing the needle: the top of axle sleeve subassembly is fixed, moves back needle bar 2 and slides down under the effect of external force, acts on elasticity portion 83 and outwards struts its back taper platform 12 that breaks away from buckle syringe needle 6 until elasticity portion 83, and under the effect of spring 4 elasticity, the bullet needle bar 5 slides down along the rectangular hole groove 10 of moving back needle bar 2 through bullet needle cover round pin 9, and bullet needle 8 is kept away from buckle syringe needle 6 to the bullet needle 8 that accomplishes the application of sample needle moves back.
By adopting the sample adding needle structure and combining the needle withdrawing mechanism for the sample adding needle 8, the complex structure of the traditional sample adding needle is abandoned, the production process cost is reduced, the rapid assembly and disassembly are realized, the defects that the O-shaped ring tensioning structure is complex, the cost is high, the O-shaped ring tensioning structure is easy to loosen and fall, the direct hard insertion and disassembly force is large, the impact is caused to a pipettor, the equipment is easy to damage, the service life is short, the sealing effect is poor and the liquid leakage is easy to occur in the traditional structure are avoided, and the technical effects are more beneficial.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A sample addition needle, comprising: including needle body and needle cap, needle body and needle cap all set up to the tubulose, the internal diameter of needle cap is greater than the internal diameter of needle body, and the connecting portion of needle cap and needle body set up to the back taper, set up a plurality of through-hole on the needle cap lateral wall, installation elasticity portion in this through-hole, the body of elasticity portion sets up to platelike, the top of body and the roof integrated into one piece of through-hole, and the bottom of body is inside the needle cap for free end and body along the projection of needle cap axis direction.
2. A sample addition needle according to claim 1, wherein: the included angle between the elastic part and the outer circumferential tangent plane of the needle cap is 9-13 degrees.
3. A sample addition needle according to claim 2, wherein: the quantity of through-hole is three, and is the annular array about the central axis of application of sample needle, and conductive plastic is chooseed for use to the material of this application of sample needle, the needle body bottom sets up to the toper.
4. A needle withdrawing mechanism for a sample application needle, for withdrawing the sample application needle according to any one of claims 1 to 3, characterized in that: move back needle mechanism and include the axle sleeve subassembly, install the buckle syringe needle in axle sleeve subassembly bottom, install with one heart that moves back the needle bar and slidable mounting in moving back the outside spring needle bar of needle bar outside at axle sleeve subassembly outside, this buckle syringe needle sets up the back taper platform that is used for installing the sealing washer mounting groove and is used for the elasticity portion joint with the application of sample needle, and back taper platform is located sealing washer mounting groove top, and the biggest external diameter of this back taper platform is less than the internal diameter of needle cap, is greater than the diameter of elasticity portion bottommost along axis projection place minimum circle and moves back the internal diameter of needle bar bottom, the bottom external diameter that moves back the needle bar is less than the needle cap external diameter of application of sample needle, install the sealing washer between the sealing washer mounting groove of buckle.
5. The needle withdrawing mechanism for the sample adding needle as set forth in claim 1, wherein: the needle withdrawing rod is provided with a step platform at the bottom, a spring is sleeved on the step platform, and the elastic needle rod is slidably mounted on the step platform and is contacted with the bottom of the spring.
6. The needle withdrawing mechanism for the sample adding needle as set forth in claim 1, wherein: move back needle bar bottom lateral wall and set up at least one rectangular hole groove, the bullet needle bar lateral wall runs through fixed mounting bullet needle cover round pin, bullet needle cover round pin slidable mounting in rectangular hole groove.
7. The needle withdrawing mechanism for the sample adding needle as set forth in claim 1, wherein: the shaft sleeve assembly comprises a first assembly and a second assembly which are both arranged as pipe fittings, and the bottom of the first assembly is in interference fit with the top of the second assembly and is in adhesive connection with the top of the second assembly.
8. The needle withdrawing mechanism for the sample adding needle as set forth in claim 1, wherein: the upper side wall of the first component is provided with a groove for placing a conductive wire, the first component is made of stainless steel, and the second component is made of non-conductive materials.
9. The needle withdrawing mechanism for the sample adding needle as set forth in claim 1, wherein: the bottom of the second component is in threaded connection with the top of the buckle needle head.
10. A method for mounting and withdrawing a loading needle, which is applied to the loading needle of any one of claims 1 to 3 and the needle withdrawing mechanism for the loading needle of any one of claims 4 to 9, wherein: the method comprises the following steps: (1) installation: the needle cap of the sample adding needle concentrically slides upwards along the bottom of the buckle needle head, the inverted cone of the buckle needle head stretches the free end of the elastic part outwards until the free end of the elastic part slides to the upper part of the inverted cone, the elastic part is restored and clamped on the upper surface of the inverted cone, the sealing ring on the buckle needle head is pressed against the connecting part of the needle cap and the needle body, the top of the needle cap extrudes the elastic needle rod to enable the elastic needle rod to slide upwards along the needle withdrawing rod, and the spring is compressed to realize the installation and fixation of the sample adding needle; (2) withdrawing the needle: the top of axle sleeve subassembly is fixed, moves back the needle pole and slides downwards under the effect of external force, acts on elasticity portion and outwards struts its back taper platform until elasticity portion breaks away from the buckle syringe needle, and under the effect of spring elasticity, the bullet needle pole slides downwards along the rectangular hole groove of moving back the needle bar through bullet needle cover round pin, and the bullet needle of playing the sample needle leaves the buckle syringe needle to accomplish the action of moving back the needle of sample needle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011136044.9A CN112345784B (en) | 2020-10-22 | 2020-10-22 | Sample adding needle, needle withdrawing mechanism used for sample adding needle and needle installing and withdrawing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011136044.9A CN112345784B (en) | 2020-10-22 | 2020-10-22 | Sample adding needle, needle withdrawing mechanism used for sample adding needle and needle installing and withdrawing method |
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| CN112345784A true CN112345784A (en) | 2021-02-09 |
| CN112345784B CN112345784B (en) | 2021-09-24 |
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| CN210700178U (en) * | 2019-08-09 | 2020-06-09 | 青海迪安医学检验中心有限公司 | Sample adding gun for blood detection |
| CN110801235A (en) * | 2019-11-13 | 2020-02-18 | 淮安易捷科技有限公司 | Puncture appliance capable of realizing continuous single-hand percussion and needle withdrawal |
| CN211505590U (en) * | 2020-02-12 | 2020-09-15 | 北京赛科希德科技股份有限公司 | Application of sample needle buffer stop |
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