CN116196994A - Self-adaptive oscillating drip breaking needle head assembly - Google Patents
Self-adaptive oscillating drip breaking needle head assembly Download PDFInfo
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- CN116196994A CN116196994A CN202310489017.7A CN202310489017A CN116196994A CN 116196994 A CN116196994 A CN 116196994A CN 202310489017 A CN202310489017 A CN 202310489017A CN 116196994 A CN116196994 A CN 116196994A
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- drip
- needle
- needle head
- dropping
- hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0241—Drop counters; Drop formers
- B01L3/0244—Drop counters; Drop formers using pins
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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
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
- G01N35/1016—Control of the volume dispensed or introduced
-
- 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
- G01N35/1065—Multiple transfer devices
- G01N35/1074—Multiple transfer devices arranged in a two-dimensional array
-
- 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
- G01N35/1081—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices characterised by the means for relatively moving the transfer device and the containers in an horizontal plane
- G01N35/109—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices characterised by the means for relatively moving the transfer device and the containers in an horizontal plane with two horizontal degrees of freedom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/02—Drop detachment mechanisms of single droplets from nozzles or pins
- B01L2400/022—Drop detachment mechanisms of single droplets from nozzles or pins droplet contacts the surface of the receptacle
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Clinical Laboratory Science (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the technical field of sampling equipment for analytical instruments, and discloses a self-adaptive oscillation drip breaking needle head assembly, which comprises the following components: a bearing frame, a plurality of drip needles arranged on the bearing frame; a plurality of oscillating pieces which are arranged on the bearing frame and are in one-to-one corresponding contact with the drip needles; a controller; the dropping needle head drops the reagent at gradually reduced dropping speed under the control of the controller, and when the real-time dropping speed of the dropping needle head is lower than a set threshold value, the controller controls the oscillating piece to drive the dropping needle head to oscillate reciprocally so as to break up and crush the reagent drops until the dropping speed of the dropping needle head is reduced to zero. The needle head assembly can break up and crush needle head liquid drops through oscillation when the dropping speed of the reagent is lower than a set threshold value, and is used in reagent sample injection operation based on PID algorithm control, and can break up and crush the liquid drops automatically when the difference between a sample injection target value and an actual value is smaller than a certain value, so that the phenomenon of hanging the liquid drops is avoided, and more precise liquid injection action is realized.
Description
Technical Field
The invention relates to the technical field of sampling equipment for analytical instruments, in particular to a self-adaptive oscillation drip breaking needle head assembly.
Background
In the traditional chemical analysis experiment, the laboratory staff needs to use a pipette or other reagent filling tools to manually operate, and certain dangers exist in the process, so that the reagent addition with different proportions in a large batch is very complicated. With the continuous development of detection technology, samples for analysis and detection are more diversified, and higher requirements are put forward on the performances of a sample injection system in terms of sample injection quantity accuracy, sample injection flow smoothness, biosafety and the like.
Therefore, an automatic liquid sample injection system has recently been developed, which controls a peristaltic pump to work according to a set quality target value, drives a liquid reagent in a corresponding reagent bottle to be conveyed into a sample bottle placed on a balance, and generally adopts a liquid dropping needle at the conveying end to drop the liquid reagent into the bottle according to a certain speed until the weighing value of the balance reaches the target value, thereby completing sample injection work. However, due to the existence of the surface tension of the liquid reagent, the phenomenon of hanging liquid easily occurs to the liquid dropping needle head in the liquid dropping process, and particularly when the liquid dropping speed is low, the liquid dropping speed has an influence on the liquid feeding precision, so that the sample injection system cannot be suitable for sample injection work with high precision requirement.
Disclosure of Invention
The invention aims to provide a self-adaptive oscillation drip breaking needle head assembly, which solves the problem that the sampling precision is reduced due to the fact that the existing drip breaking needle head is easy to generate a liquid hanging phenomenon.
The invention realizes the above purpose through the following technical scheme:
an adaptively oscillatable droplet breaking needle assembly, said assembly comprising:
a bearing frame is arranged on the bearing frame,
a plurality of drip needles movably mounted on the bearing frame;
a plurality of oscillating pieces which are arranged on the bearing frame and are in one-to-one corresponding contact with the drip needles;
a controller;
the controller controls the oscillating piece to drive the drip needle to oscillate reciprocally to break up and crush the reagent liquid drops until the drip acceleration of the drip needle is reduced to zero.
The further improvement is that the specific process of controlling the dropping speed of the dropping needle head by the controller is as follows: and obtaining a real-time mass value of the dripping reagent, and performing PID calculation on a difference value between the real-time mass value and a set target mass value to obtain the continuously adjusted dripping acceleration of the dripping needle head, so that the dripping acceleration is gradually reduced until the dripping acceleration is zero.
The further improvement lies in, set up a plurality of first through-hole that runs through on the bearing frame, the side of every first through-hole all expands and is equipped with the second through-hole, the dropping liquid syringe needle is installed in first through-hole and with pore wall clearance fit, the vibration piece is located the second through-hole and is connected with the laminating of dropping liquid syringe needle lateral wall.
The liquid dropping needle head is characterized by further comprising a cylindrical needle seat and a conical needle head communicated with the bottom of the cylindrical needle seat, wherein the cylindrical needle seat is positioned in the first through hole, an air sac body is embedded at the upper part of a gap between the cylindrical needle seat and the first through hole, a limit body is embedded at the lower part of the gap between the cylindrical needle seat and the first through hole, the upper part of the cylindrical needle seat is in flexible contact with the wall of the first through hole through the air sac body, the lower part of the cylindrical needle seat is in rigid contact with the wall of the first through hole through the limit body, and the oscillating piece is in fit connection with the side wall of the upper part of the cylindrical needle seat;
when the oscillating piece drives the upper part of the cylindrical needle seat to oscillate reciprocally, the tail end of the conical needle head oscillates reciprocally with the same frequency and larger amplitude under the leverage of the limiting body.
The further improvement is that the air bag body and the limiting body are annular with notches, and the cross section of the limiting body is circular with the diameter equal to the gap width between the cylindrical needle seat and the first through hole.
The pipeline rack is provided with a plurality of perforations, conveying hoses are inserted in the perforations, and the conveying hoses are communicated with the liquid dropping needles in a one-to-one correspondence mode.
The improvement is that a protective shell is arranged outside the pipeline frame.
A further improvement is that the assembly further comprises a bundling tube, inside which all conveying hoses are inserted centrally.
The invention has the beneficial effects that: the needle head assembly can break up and crush needle head liquid drops through oscillation when the dropping speed of the reagent is lower than a set threshold value, and is used in reagent sample injection operation based on PID algorithm control, and can break up and crush the liquid drops automatically when the difference value between a sample injection target value and an actual value is smaller than a certain value, so that the phenomenon of hanging the liquid drops is avoided, more precise liquid adding action is realized, and experiments prove that the single sample dropping precision can reach 0.001g.
Drawings
FIG. 1 is a schematic overall structure of embodiment 1 of the present invention;
FIG. 2 is a schematic view illustrating the installation of a carrier and related structures in embodiment 1 of the present invention;
FIG. 3 is a schematic top view of a carrier according to embodiment 1 of the present invention;
FIG. 4 is a schematic view showing the installation of a drip needle in example 2 of the present invention;
FIG. 5 is a cross-sectional view of the position of the carriage in embodiment 2 of the present invention;
in the figure: 1. a carrier; 11. a first through hole; 12. a second through hole; 2. a dropping needle; 21. a cylindrical needle seat; 22. a conical needle; 3. an oscillating piece; 4. an air bag body; 5. a limiting body; 6. a pipe rack; 61. perforating; 7. a conveying hose; 8. a protective shell; 9. and (5) bundling the pipes.
Detailed Description
The following detailed description of the present application is provided in conjunction with the accompanying drawings, and it is to be understood that the following detailed description is merely illustrative of the application and is not to be construed as limiting the scope of the application, since numerous insubstantial modifications and adaptations of the application will be to those skilled in the art in light of the foregoing disclosure.
Example 1
Referring to fig. 1-3, an adaptable oscillating droplet breaking needle assembly is shown, the assembly comprising:
a carrying frame 1 is provided with a plurality of supporting frames,
a plurality of drip needles 2 movably mounted on the carrier 1;
a plurality of oscillating pieces 3 (for example, oscillating motors with eccentric vibrators) which are arranged on the bearing frame 1 and are in one-to-one corresponding contact with the drip needles 2;
a controller;
the liquid dropping needle head 2 drops the reagent with gradually reduced dropping speed under the control of the controller, and when the real-time dropping speed of the liquid dropping needle head 2 is lower than a set threshold value, the controller controls the oscillating piece 3 to drive the liquid dropping needle head 2 to oscillate reciprocally so as to break up and crush the reagent liquid drops until the dropping speed of the liquid dropping needle head 2 is reduced to zero. Therefore, the phenomenon of hanging drop can be avoided, more precise liquid adding action is realized, and experiments prove that the single drop sample precision can reach 0.001g.
In this embodiment, the specific process of controlling the dropping speed of the dropping needle 2 by the controller is as follows: and obtaining a real-time mass value of the dripping reagent, and performing PID calculation on a difference value between the real-time mass value and a set target mass value to obtain the continuously adjusted dripping needle head 2 dripping acceleration, so that the dripping acceleration is gradually reduced until the dripping acceleration is zero. In practical applications, the assembly can be used in a reagent sample injection system based on PID algorithm control, and the sample injection system generally comprises a peristaltic pump for driving reagent delivery and a weighing piece for acquiring a sample injection real-time value. The controller obtains a real-time quality value of sample injection based on a PID algorithm, performs PID calculation on a difference value between the real-time quality value and a set target quality value to obtain a real-time conveying rate of the peristaltic pump, and controls the peristaltic pump to convey the reagent through the dropping needle head 2 at the real-time conveying rate. Therefore, after the sample injection target value is set, when the difference value between the target value and the real-time value is larger, the conveying speed of the peristaltic pump is high, and when the difference value is smaller, the conveying speed of the peristaltic pump is low, so that the dripping acceleration of the reagent is adjusted in real time according to the difference value between the target value and the real-time value, and the dripping acceleration of the reagent in the dripping needle head 2 is gradually reduced along with the reduction of the difference value between the sample injection target value and the real-time value. When the difference between the sample injection target value and the real-time value is smaller than a certain value, the dripping speed of the reagent in the dripping needle head 2 is smaller than a set threshold value, at the moment, an oscillation scattering program can be automatically started, and the oscillating piece 3 is controlled to drive the dripping needle head 2 to oscillate reciprocally so as to scatter the reagent droplets until the reagent sample injection of the target value is completed.
In this embodiment, preferably, the carrier 1 is provided with a plurality of first through holes 11 penetrating through, the side edge of each first through hole 11 is provided with a second through hole 12 in an expanding manner, the drip needle 2 is installed in the first through hole 11 and is in clearance fit with the hole wall, the oscillating piece 3 is located in the second through hole 12 and is attached to the side wall of the drip needle 2, and the oscillating piece 3 drives the drip needle 2 to oscillate reciprocally in the first through hole 11.
In this embodiment, preferably, the carrier 1 is provided with a pipe frame 6, a plurality of perforations 61 are formed in the pipe frame 6, and a conveying hose 7 is inserted in the perforations 61, so that interference fit can be adopted between the conveying hose 7 and the perforations 61 to prevent sliding, and the conveying hose 7 is correspondingly communicated with the drip needles 2 one by one, so that even if gaps exist between the drip needles 2 and the walls of the first through holes 11, the position stability of the drip needles 2 can be ensured.
In addition, the outside of pipeline frame 6 is equipped with protective housing 8, and open is seted up at protective housing 8 top for conveying hose 7 passes through. The assembly further comprises a bundling tube 9, wherein the bundling tube 9 is internally used for intensively penetrating all conveying hoses 7, so that the disorder of the pipelines is avoided.
Example 2
Referring again to fig. 4-5, embodiment 2 is further based on the structure of embodiment 1: the liquid dropping needle head 2 comprises a cylindrical needle seat 21 and a conical needle head 22 communicated with the bottom of the cylindrical needle seat 21, the cylindrical needle seat 21 is positioned in the first through hole 11, an air sac body 4 is embedded at the upper part of a gap between the cylindrical needle seat 21 and the first through hole 11, a limit body 5 is embedded at the lower part of the gap between the cylindrical needle seat 21 and the first through hole 11, the upper part of the cylindrical needle seat 21 is in flexible contact with the wall of the first through hole 11 through the air sac body 4, the lower part of the cylindrical needle seat 21 is in rigid contact with the wall of the first through hole 11 through the limit body 5, and the oscillating piece 3 is in fit connection with the side wall of the upper part of the cylindrical needle seat 21;
because the length of the conical needle head 22 is larger, and the distance between the tail end of the conical needle head 22 and the limiting body 5 is larger than the distance between the attaching position of the oscillating piece 3 and the limiting body 5, when the oscillating piece 3 drives the upper part of the cylindrical needle seat 21 to oscillate reciprocally, the tail end of the conical needle head 22 oscillates reciprocally with the same frequency and larger amplitude under the leverage of the limiting body 5. The design has the advantages that aiming at the problem of limited oscillation amplitude of the oscillation motor, on the premise of unchanged oscillation frequency, the oscillation amplitude and the moving speed of the tail end of the conical needle head 22 are increased, so that liquid drops can be better scattered and thrown off, and the sampling precision is further increased.
In this embodiment, the air bag body 4 and the limiting body 5 are preferably ring-shaped with a notch, the cross section of the limiting body 5 is circular with the diameter equal to the gap width between the cylindrical needle seat 21 and the first through hole 11, and the circular arrangement facilitates the swinging of the cylindrical needle seat 21.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. An adaptable oscillating droplet breaking needle assembly, said assembly comprising:
a carrying frame (1),
a plurality of drip needles (2) movably arranged on the bearing frame (1);
a plurality of oscillating pieces (3) which are arranged on the bearing frame (1) and are in one-to-one corresponding contact with the drip needles (2);
a controller;
the liquid dropping needle head (2) is controlled by the controller to drop the reagent at gradually reduced dropping speed, and when the real-time dropping speed of the liquid dropping needle head (2) is lower than a set threshold value, the controller controls the oscillating piece (3) to drive the liquid dropping needle head (2) to oscillate reciprocally so as to break up and crush the reagent liquid drops until the dropping speed of the liquid dropping needle head (2) is reduced to zero.
2. The self-adaptive oscillation drip breaking needle assembly according to claim 1, wherein the specific process of controlling the drip acceleration of the drip needle (2) by the controller is as follows: and obtaining a real-time mass value of the dripping reagent, and performing PID calculation on a difference value between the real-time mass value and a set target mass value to obtain the continuously adjusted dripping acceleration of the dripping needle (2), so that the dripping acceleration is gradually reduced until the dripping acceleration is reduced to zero.
3. The self-adaptive oscillation drip-breaking needle assembly according to claim 1, characterized in that a plurality of first through holes (11) penetrating through are formed in the bearing frame (1), second through holes (12) are formed in the side edges of each first through hole (11) in an expanding mode, the drip needle (2) is installed in the first through holes (11) and in clearance fit with the hole wall, and the oscillating piece (3) is located in the second through holes (12) and is in fit connection with the side wall of the drip needle (2).
4. The self-adaptive oscillation drip-breaking needle assembly according to claim 3, wherein the drip needle (2) comprises a cylindrical needle seat (21) and a conical needle head (22) communicated with the bottom of the cylindrical needle seat (21), the cylindrical needle seat (21) is positioned in the first through hole (11), an air sac body (4) is embedded at the upper part of a gap between the cylindrical needle seat (21) and the first through hole (11), a limit body (5) is embedded at the lower part of the gap between the cylindrical needle seat (21) and the first through hole (11), the upper part of the cylindrical needle seat (21) is in flexible contact with the wall of the first through hole (11) through the air sac body (4), the lower part of the cylindrical needle seat (21) is in rigid contact with the wall of the first through hole (11) through the limit body (5), and the oscillating piece (3) is in fit connection with the upper side wall of the cylindrical needle seat (21).
When the oscillating piece (3) drives the upper part of the cylindrical needle seat (21) to oscillate in a reciprocating manner, the tail end of the conical needle head (22) oscillates in a reciprocating manner with the same frequency and larger amplitude under the leverage of the limiting body (5).
5. The self-adaptive oscillation drip-breaking needle assembly according to claim 4, wherein the air bag body (4) and the limiting body (5) are ring-shaped with notches, and the cross section of the limiting body (5) is circular with the diameter equal to the gap width between the cylindrical needle seat (21) and the first through hole (11).
6. The self-adaptive oscillation drip-breaking needle assembly according to claim 1, wherein the bearing frame (1) is provided with a pipeline frame (6), the pipeline frame (6) is provided with a plurality of perforations (61), conveying hoses (7) are inserted into the perforations (61), and the conveying hoses (7) are communicated with the drip needles (2) in a one-to-one correspondence.
7. An adaptive oscillating droplet breaking needle assembly according to claim 6, characterized in that a protective shell (8) is provided outside the tubing (6).
8. An adaptable oscillating drip-breaking needle assembly according to claim 6, further comprising a bundling tube (9), wherein the bundling tube (9) is internally adapted for concentrated penetration of all delivery hoses (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310489017.7A CN116196994B (en) | 2023-05-04 | 2023-05-04 | Self-adaptive oscillating drip breaking needle head assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310489017.7A CN116196994B (en) | 2023-05-04 | 2023-05-04 | Self-adaptive oscillating drip breaking needle head assembly |
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| CN116196994A true CN116196994A (en) | 2023-06-02 |
| CN116196994B CN116196994B (en) | 2023-07-21 |
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| Publication number | Publication date |
|---|---|
| CN116196994B (en) | 2023-07-21 |
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