CN219320195U

CN219320195U - Sample injection needle cleaning module and automatic sample injector

Info

Publication number: CN219320195U
Application number: CN202221883899.2U
Authority: CN
Inventors: 李�浩; 朱恒; 崔强
Original assignee: Dehe Chuangrui Scientific Instruments Qingdao Co ltd
Current assignee: Dehe Chuangrui Scientific Instruments Qingdao Co ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2023-07-07
Anticipated expiration: 2032-07-22

Abstract

The utility model discloses a sample injection needle cleaning module and an automatic sample injector, wherein the sample injection needle cleaning module comprises a sample injection needle, a peristaltic pump, a waste liquid container, a pure water container and a cleaning seat, and the sample injection needle, the peristaltic pump and the pure water container are sequentially connected; the top of the cleaning seat is provided with a groove, the bottom of the groove is provided with a blind hole and a liquid draining hole, and the blind hole is configured for the insertion of the sample injection needle; wherein, pure water in the pure water container is discharged into the blind hole from the sampling needle via the peristaltic pump, and water overflowed from the blind hole flows into the waste liquid container via the liquid draining hole. The sample injection needle cleaning module is used for improving the cleaning effect on the inside and the outside of the sample injection needle and reducing the using amount of the cleaning liquid in the sample injection needle cleaning process so as to reduce the using cost.

Description

Sample injection needle cleaning module and automatic sample injector

Technical Field

The utility model relates to the technical field of machinery, in particular to a sample injection needle cleaning module and an automatic sample injector.

Background

In the use process of the ion chromatograph, the ion chromatograph is usually matched with a sample injector to carry out automatic sample injection. Currently, commonly used autosamplers are typically configured with a sample injection needle for insertion into a sample bottle and a peristaltic pump that is then activated to draw the sample from the sample bottle through the sample injection needle. And before the liquid in one of the sample bottles is extracted and the sample bottle is replaced for cleaning, the sample injection needle needs to be cleaned. In the conventional technology, a sample injection needle is inserted into a cleaning liquid, and a peristaltic pump is started to suck the cleaning liquid through the sample injection needle to clean. However, in the actual operation process, the liquid level can gradually drop along with the suction operation, so that the outer wall of the sample injection needle is not cleaned, the whole cleaning liquid can be polluted after the sample injection needle is inserted into the cleaning liquid, and a new cleaning liquid needs to be replaced when the sample injection needle is cleaned next time, so that the use amount of the cleaning liquid is increased, and the use cost is increased. In view of this, it is an object of the present utility model to design a technique for improving the cleaning effect and reducing the usage amount of the cleaning liquid to reduce the usage cost.

Disclosure of Invention

The utility model provides a sample injection needle cleaning module and an automatic sample injector, which are used for improving the cleaning effect on the inside and the outside of a sample injection needle and reducing the using amount of cleaning liquid in the process of cleaning the sample injection needle through the sample injection needle cleaning module so as to reduce the using cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a sample injection needle cleaning module which comprises a sample injection needle, a peristaltic pump, a waste liquid container, a pure water container and a cleaning seat, wherein the sample injection needle, the peristaltic pump and the pure water container are sequentially connected; the top of the cleaning seat is provided with a groove, the bottom of the groove is provided with a blind hole and a liquid draining hole, and the blind hole is configured for the insertion of the sample injection needle;

wherein, pure water in the pure water container is discharged into the blind hole from the sampling needle via the peristaltic pump, and water overflowed from the blind hole flows into the waste liquid container via the liquid draining hole.

Further, the upper portion of the cleaning seat is further provided with a cover plate, the cover plate is provided with a through hole, the cover plate covers the groove, and the through hole and the blind hole are oppositely arranged.

Further, the waste liquid container is arranged below the cleaning seat; the drain hole is arranged opposite to the inlet of the waste liquid container, or the drain hole is communicated with the inlet of the waste liquid container.

Further, the peristaltic pump is a bidirectional pump;

the peristaltic pump is selectively connected with the waste liquid container and the pure water container through a reversing valve, and the sampling valve, the peristaltic pump, the reversing valve and the capacitive proximity switch are respectively and electrically connected with the controller.

The utility model also provides an automatic sample injector, which comprises a base, a rotating disc, a sample injection needle cleaning module and a cleaning seat, wherein a plurality of jacks are arranged on the rotating disc, the rotating disc is rotatably arranged on the base, the sample injection needle cleaning module is arranged above the rotating disc, and the cleaning seat is arranged on the base and is positioned on one side of the rotating disc.

Further, the sample injection valve, the peristaltic pump and the reversing valve are arranged on the front panel of the base.

Further, the device further comprises a motion installation mechanism, the motion installation mechanism comprises a stand column, a lifting seat and an installation arm, the stand column is vertically arranged on the base and arranged on one side of the rotating disc, the lifting seat is arranged on the stand column in a vertically sliding mode, the installation arm is transversely arranged and rotatably arranged on the lifting seat, and the sample injection needle is vertically arranged and arranged on the free end portion of the installation arm.

Further, the waste liquid container is internally arranged in the base, a socket is arranged on the base, and a liquid discharge pipe of the waste liquid container is inserted in the socket.

Compared with the prior art, the technical scheme of the utility model has the following technical effects: the cleaning seat is configured to assist in cleaning the sample injection needle, the blind hole is formed in the cleaning seat and is used for the sample injection needle to be inserted into the blind hole when the sample injection needle is cleaned, the peristaltic pump sucks the pure water container and outputs the pure water from the sample injection needle so as to realize cleaning of an internal flow path of the sample injection needle, and pure water output from the sample injection needle is discharged into the blind hole so that the water level in the blind hole is quickly increased to submerge the sample injection needle, and further the outer wall of the sample injection needle is cleaned; in addition, in the cleaning process, pure water in the pure water container always keeps a clean state, and the volume of the blind hole is smaller, so that the use amount of pure water is greatly reduced in the cleaning process, the cleaning effect on the inside and outside of the sample injection needle is improved, the use amount of cleaning liquid is reduced, and the use cost is reduced.

Drawings

FIG. 1 is a schematic view of an autoinjector according to the present utility model in a closed operating state;

FIG. 2 is a schematic view of an automatic injector of the present utility model in an open state;

FIG. 3 is a schematic view of the partial structure of FIG. 1 with the housing removed;

FIG. 4 is a cross-sectional view of FIG. 1 with the housing removed;

FIG. 5 is one of the assembly views of the rotating disk, sample injection needle and motion mounting mechanism of FIG. 1;

FIG. 6 is a second assembled view of the rotating disk, sample injection needle and motion mounting mechanism of FIG. 1;

FIG. 7 is an assembly view of the sample injection needle and kinematic mount of FIG. 1;

FIG. 8 is an assembled cross-sectional view of the sample injection needle and kinematic mount mechanism of FIG. 1;

FIG. 9 is a schematic flow diagram of an autoinjector according to the present utility model;

FIG. 10 is a schematic view of the front panel of FIG. 1;

FIG. 11 is a schematic view of the cleaning seat in FIG. 1;

fig. 12 is a cross-sectional view of the purge seat of fig. 1.

Reference numerals:

the device comprises a base 1, a front panel 10, a second motor 11, a third photoelectric sensor 12, a fourth photoelectric sensor 13, a capacitive proximity switch 14, a panel cover 15 and a socket 16;

a mounting port 101, a first bracket 102, a second bracket 103;

the rotary disc 2, the jack 21, the second rotary shaft 22, the second fluted disc 23 and the limiting rod 24;

the sample injection needle 3, the first baffle plate 31, the sample injection valve 32, the quantitative ring 33, the peristaltic pump 34, the reversing valve 35, the waste liquid container 36 and the pure water container 37;

the motion installation mechanism 4, the upright post 41, the lifting seat 42, the installation arm 43, the buffer component 44, the needle frame 45 and the guide component 46;

the device comprises a screw 411, a stepping motor 412, a first motor 421, a first photoelectric sensor 422, a second photoelectric sensor 423, a first rotating shaft 431, a first fluted disc 432, a limiting plate 433, a first limiting part 434, a first photoelectric sensor 435, a second photoelectric sensor 436, a guide sleeve 441, a flanging structure 4411, a spring 442, a support rod 461, a guide frame 462, a guide hole 463, a second baffle 464 and a U-shaped frame 465;

a housing 5 and a door body 51;

the cleaning seat 6, the groove 61, the blind hole 62, the liquid discharge hole 63, the cover plate 64 and the through hole 65;

sample bottle 100.

Description of the embodiments

The present utility model provides an autosampler, the disk autosampler generally comprising: the device comprises a sample injection needle, a rotating disc, a peristaltic pump, a motion installation mechanism and various electric control valves.

Wherein, to mechanical structure, be provided with the jack on the rolling disc and place the sample bottle, the rolling disc can rotate in order to switch different sample bottles and be in sampling station. The sample injection needle is arranged on the motion installation mechanism, so that the sample in the sample bottle can be collected by lifting the sample injection needle through the motion installation mechanism. The components such as the sample injection needle, the peristaltic pump and the sample injection valve are connected through the pipeline to form a liquid flow path, and in the use process, the liquid flow path can meet the requirements of liquid flow in the operation processes such as sampling, cleaning and the like.

The disk-type autoinjector of the present utility model is improved in many ways for each functional portion, and is described below with reference to the accompanying drawings.

In order to solve the problem in the prior art that the range of a sample collection bottle is limited due to the fact that a sample injection needle can only lift, the carrying capacity of the sample bottle is small.

As shown in fig. 1 to 6, in order to solve the above-mentioned technical problems, the autoinjector of the present embodiment includes a base 1, a rotating disc 2, a sampling needle 3 and a movement mounting mechanism 4, the rotating disc 2 is rotatably disposed on the base 1, a plurality of circles of insertion holes 21 are disposed on the rotating disc 2 in a surrounding manner, the movement mounting mechanism 4 includes a stand column 41, a lifting seat 42 and a mounting arm 43, the stand column 41 is vertically disposed on the base 1 and disposed on one side of the rotating disc 2, the lifting seat 42 is slidably disposed on the stand column 41 up and down, the mounting arm 43 is laterally disposed and rotatably disposed on the lifting seat 42, and the sampling needle 3 is vertically disposed and disposed on a free end portion of the mounting arm 43.

Specifically, the motion mounting mechanism 4 in the present embodiment can meet the requirement of lifting and lowering the sample needle 3 by the lifting base 42, and in addition, the sampling position of the sample needle 3 can be adjusted by rotatably mounting the arm 43. Thus, in the actual use process, for sample bottles placed at different radial positions, the mounting arm 43 is rotated to enable the sample injection needle 3 to be located at different radial sampling stations, and then the lifting seat 42 moves up and down, so that sample bottles at different sampling stations can be sampled.

Further, in order to facilitate the up-down accurate movement of the lifting seat 42, the upright post 41 is provided with a vertically arranged and rotatable screw 411, the lifting seat 42 is provided with a threaded hole (not shown), and the screw 411 is in threaded connection with the threaded hole.

Specifically, the screw 411 disposed on the upright 41 may be driven by a stepper motor 412 or a servo motor, and the screw 411 may be rotated to drive the lifting seat 42 to move up and down accurately, so as to drive the sampling needle to perform sampling operation.

Still further, in order to improve the safety in the sampling process, the automatic sampler further comprises a housing 5, the housing 5 is provided with a door body 51 which can be opened and closed, the housing 5 is arranged on the base 1, and the rotating disc 2, the sampling needle 3 and the movement mounting mechanism 4 are positioned in the housing 5.

Specifically, by disposing the housing 5 on the base 1, the housing 5 can cover the rotating disc 2, the sample injection needle 3 and the motion mounting mechanism 4, so that the moving sampling needle is not affected by external factors in the sampling process, and the sampling needle or other moving parts can be prevented from being touched by a user due to misoperation, so that the use reliability is improved.

In some embodiments, the lifting base 42 is provided with a first motor 421, the mounting arm 43 is provided with a first rotating shaft 431 arranged vertically, the first rotating shaft 431 is rotatably disposed on the lifting base 42, and the first motor 421 is in transmission connection with the first rotating shaft 431.

Specifically, for the mounting arm 43, it is rotatably mounted on the lifting base 42 by the first rotation shaft 431, and the first rotation shaft 431 enables the mounting arm 43 to horizontally rotate with respect to the lifting base 42. The first motor 421 can drive the first rotation shaft 431 to rotate through a belt transmission mode, so as to drive the mounting arm 43 to rotate.

Wherein, in order to precisely control the rotation angle of the mounting arm 43, the mounting arm 43 is further provided with a first fluted disc 432, the lifting seat 42 is provided with a first photoelectric sensor 422, and the first photoelectric sensor 422 forms a first detection area for detecting teeth on the first fluted disc 432.

Specifically, in the process of driving the mounting arm 43 to rotate by the first motor 421, the first toothed disc 432 rotates along with the mounting arm 43, and the teeth on the rotating first toothed disc 432 can be detected by the first photoelectric sensor 422, so as to determine the rotation angle of the mounting arm 43 according to the detected number of teeth.

In addition, in order to limit the rotation amplitude of the mounting arm 43, the mounting arm 43 is further provided with a limiting plate 433, the limiting plate 433 is horizontally arranged, and the limiting plate 433 is provided with at least two first limiting parts 434 extending outwards; the lifting seat 42 is provided with a second photoelectric sensor 423, and the second photoelectric sensor 423 forms a second detection area for detecting the first limit portion 434.

Specifically, during the rotation process of the mounting arm 43, when the second photoelectric sensor 423 detects the first limiting portion 434, the first motor 421 is triggered to stop rotating or reversely rotate, so as to limit the maximum rotation angle of the mounting arm 43, and further avoid the excessive rotation angle of the mounting arm 43 from striking on other components.

Likewise, the limiting plate 433 can also trigger the second photoelectric sensor 423 by adopting a notch setting manner, that is, the limiting plate 433 is in a disc structure, a notch is formed at the edge of the disc structure, and when the limiting plate follows the mounting arm 43 to rotate, the notch is located in the second detection area of the second photoelectric sensor 423, so that the first motor 421 can be triggered to stop rotating or reversely rotate.

Further, a second rotating shaft 22 is vertically arranged on the rotating disc 2, the second rotating shaft 22 is rotatably arranged on the base 1, a second motor 11 is further arranged on the base 1, and the second motor 11 is in transmission connection with the second rotating shaft 22.

Specifically, the rotating disc 2 is disposed on the base 1 through the second rotating shaft 22, and then, the third motor can drive the second rotating shaft 22 to rotate through the belt, so as to drive the rotating disc 2 to rotate.

Correspondingly, in order to precisely control the rotation angle of the rotating disc 2 so that the sample bottle at the corresponding position is located at the sampling station, a second fluted disc 23 is arranged on the second rotating shaft 22, a third photoelectric sensor 12 is arranged on the base 1, and the third photoelectric sensor 12 forms a third detection area for detecting teeth on the second fluted disc 23.

Specifically, in the rotation process of the rotating disc 2, the third photoelectric sensor 12 can detect teeth on the second fluted disc 23, so as to obtain the rotation angle of the rotating disc 2, so as to accurately control the rotation angle of the rotating disc 2.

Correspondingly, a limiting rod 24 is arranged on the second rotating shaft 22, a fourth photoelectric sensor 13 is arranged on the base 1, and the fourth photoelectric sensor 13 forms a fourth detection area for detecting the free end part of the limiting rod 24.

Specifically, the fourth photoelectric sensor 13 can detect the position of the stop lever 24, and after detecting the stop lever 24, the second motor 11 can be triggered to stop rotating or reversing.

For the automatic sampler, an electric control board is configured to meet the requirement of connecting an external power supply for power supply, and a controller is integrated on the electric control board so as to be electrically connected with a peristaltic pump, an electric control valve, a sensor and a motor through the controller, so that electric control is realized, wherein a performance entity of the controller can be a single chip microcomputer and other conventional control devices, and a specific control process can refer to a control mode of the conventional automatic sampler, so that limitation and redundant description are omitted.

Through adopting can wobbling installation arm to install the sample introduction needle, in the use, the installation arm can drive the sample introduction needle and rotate according to the jack position of the corresponding circle of sample bottle place on the rolling disc, so that the sample introduction needle can aim at the sample bottle of below and accomplish the sample introduction, and, because the installation arm can rotate, so that the sample introduction needle can satisfy the sample introduction requirement of the sample bottle of rolling disc radial direction on the incessant position department, realize that the sample introduction needle on the autosampler can drive the swing by the installation arm according to the sample position, and then increase the sample sampling scope, the sample bearing capacity of autosampler has been improved.

In the second embodiment, in order to improve the use reliability of the sample injection needle, the pricking bending of the sample injection needle caused by the skew of the placing posture of the sample bottle is reduced.

As shown in fig. 1-8, the motion mounting mechanism 4 in this embodiment further includes a buffer assembly 44 and a needle frame 45, the needle frame 45 is disposed at a free end of the mounting arm 43, the buffer assembly 44 includes a guide sleeve 441 and a spring 442, the guide sleeve 441 is vertically disposed and slidably disposed on the needle frame 45, an upper end of the injection needle 3 is disposed on the guide sleeve 441, and the spring 442 is disposed between the guide sleeve 441 and the needle frame 45. Wherein, the sample injection needle 3 and the motion installation mechanism 4 form a sample injection device.

Specifically, in the actual use process, when the sample bottle on the rotating disc is placed askew, the mounting arm 43 drives the sample injection needle 3 to move downwards, the sample injection needle 3 is inserted into the bottle cap of the sample bottle, and the bottle cap is harder so that the sample injection needle 3 cannot be pricked.

After the sample injection needle 3 touches the bottle cap of the sample bottle, the sample injection needle 3 is blocked by the bottle cap and cannot move downwards, the upper end of the sample injection needle 3 is arranged in the guide sleeve 441, and the guide sleeve 441 can slide relative to the needle frame 45. The injection needle 3 is transferred to the guide sleeve 441 so that the guide sleeve 441 moves relative to the needle holder 45 against the elastic force of the spring 442. In this way, the requirement that the mounting arm 43 continues to move downwards after the sample injection needle 3 abuts against the bottle cap of the sample bottle can be met, so that the sample injection needle 3 is prevented from bending.

Wherein, in order to install the positioning spring 442 conveniently, the guide sleeve 441 is provided with a flanging structure 4411, and the spring 442 is clamped between the flanging structure 4411 and the needle frame 45. Specifically, the lower end of the spring 442 abuts against the burring 4411, and the upper end of the spring 442 abuts against the needle holder 45, so that the spring 442 can be compressed during the upward movement of the guide sleeve 441. And, in the case that the sample bottle is placed in a correct posture, the sample needle 3 can be inserted into the sample bottle against the film on the bottle cap of the sample bottle by using the elastic force provided by the spring 442 to the guide sleeve 441.

Further, in order to prevent the sample needle 3 from touching the bottle cap of the sample bottle and the mounting arm 43 from continuously moving downwards after the sample bottle is tilted, the upper end portion of the sample needle 3 is further provided with the first baffle 31, the mounting arm 43 is further provided with the first photoelectric sensor 435, and the first photoelectric sensor 435 forms a first detection area for detecting the first baffle 31.

Specifically, after the sample needle 3 is pricked on the bottle cap of the sample bottle, the sample needle 3 and the guide sleeve are fixed relative to the sample bottle, and the mounting arm 43 drives the first photoelectric sensor 435 to move downwards, at this time, the first blocking piece 31 in the first detection area of the first photoelectric sensor 435 is gradually separated, so that the first blocking piece 31 is detected by the first photoelectric sensor 435 to leave the first detection area to determine that the sample needle 3 is blocked from moving downwards, and then the controller controls the mounting arm 43 not to move continuously.

Furthermore, in order to enable the sample injection needle 3 to stably and reliably puncture the film on the bottle cap of the sample bottle and insert the film into the sample bottle in the normal sample injection process. The automatic sampler further comprises a guide assembly 46, the guide assembly 46 comprises a support rod 461 and a guide frame 462, a guide hole 463 is formed in the guide frame 462, the support rod 461 is vertically arranged and slidably arranged on the mounting arm 43, the guide frame 462 is arranged at the lower end part of the support rod 461, and the lower end part of the sampling needle 3 penetrates through the guide hole 463.

Specifically, the support rod 461 is provided on the mounting arm 43 and is disposed to extend downward, the guide frame 462 is provided at the lower end portion of the support rod 461, and the sample injection needle 3 is inserted into the guide hole 463. Thus, during the downward movement of the needle 3, the guide assembly 46 follows the mounting arm 43. The guide frame 462 will touch the bottle cap of the sample bottle, at this time, the guide frame 462 will be attached to the sample bottle and will not move downwards, the mounting arm 43 will drive the sample needle 3 to move continuously, the sample needle 3 is inserted into the guide hole 463, and then the sample needle 3 is guided and supported by the guide hole 463 of the guide frame 462 in the process of inserting the sample needle 3 into the sample bottle, so as to improve the use reliability of the sample needle 3.

Further, a second baffle 464 is disposed at the upper end of the support rod 461, and a second photoelectric sensor 436 is disposed on the mounting arm 43, where the second photoelectric sensor 436 forms a second detection area for detecting the second baffle.

Specifically, during actual use, when the mounting arm 43 moves downward, the guide frame 462 in the guide assembly 46 will abut against the sample bottle, so that the second baffle plate moves relative to the mounting arm 43, and the second baffle plate 464 will be separated from the second detection area formed by the second photoelectric sensor 436, which indicates that the sample bottle is placed in the jack 21 corresponding to the rotating disc, so that normal sample injection can be performed.

Since there is a possibility that some of the receptacles 21 on the rotating disc will not receive a sample bottle, and when the receptacles 21 move to the sample introduction station below the sample introduction needle 3, the guide frame 462 will continue to move downward along with the mounting arm 43, and the second shutter 464 will also be located in the detection area two formed by the second photoelectric sensor 436. If the descending distance of the mounting arm 43 reaches the set value and the second baffle 464 is always located in the second detection area formed by the second photoelectric sensor 436, it is determined that the sample bottle is not placed in the jack 21, at this time, an alarm can be given, or the rotating disc is triggered to rotate to switch the other jack 21 to move to the sample feeding station.

Wherein, in order to improve the stable reliability of the guide assembly 46 in the use, the guide assembly 46 includes two parallel arranged support rods 461, the guide frame 462 is disposed between the lower ends of the two support rods 461, and the sample injection needle 3 is disposed between the two support rods 461.

Specifically, the two support rods 461 can stably and reliably support the guide frame 462 installed below, and the two support rods 461 are mutually matched and can slide up and down more stably relative to the installation arm 43.

In addition, a U-shaped bracket 465 is connected between the upper ends of the two support rods 461, and the second blocking piece is provided on the U-shaped bracket 465.

Specifically, the upper ends of the two support rods 461 are connected together through the U-shaped frame 465, on the one hand, the U-shaped frame 465 can connect the two support rods 461 together, and on the other hand, the U-shaped frame 465 also plays a role in fixedly mounting the second baffle.

The fixed sampling needle is installed through the motion installation mechanism, the motion installation mechanism is provided with the buffer assembly to install the sampling needle on the installation arm, and in the use process, when the sampling needle cannot be inserted into the sample bottle due to the skew of the sample bottle, the sampling needle is propped against the bottle cap of the sample bottle and cannot continue to move downwards, and the installation arm can continue to move downwards, at the moment, the downward movement action of the installation arm is met by the spring, the sampling needle is kept at the original position and cannot be pricked and bent, the effect that the sampling device has the pricking and bending prevention function is achieved, the pricking and bending phenomenon of the sampling needle is reduced, and the use reliability of the automatic sampling device is improved.

In the third embodiment, in the actual sampling process, an empty sample bottle is easily placed on the rotating disc due to operator error, so that the automatic sampler idles under the condition that the sample is not collected by the sample injection needle, and the detection is invalid, so that the use reliability of the automatic sampler is reduced.

As shown in fig. 1-9, in order to solve the above technical problem, a capacitive proximity switch 14 may be configured in the auto-sampler, and the capacitive proximity switch 14 is used to detect whether there is a liquid flowing in a pipeline connected to a peristaltic pump 34 in the auto-sampler, so as to prevent the auto-sampler from idling, and improve the reliability of use of the auto-sampler.

Specifically, the liquid flow path in the automatic sampler generally comprises a sample injection needle 3, a sample injection valve 32, a quantitative ring 33, a peristaltic pump 34, a reversing valve 35, a waste liquid container 36 and a pure water container 37; the sample injection needle 3 is connected with the peristaltic pump 34 through the sample injection valve 32, the quantitative ring 33 is connected on the sample injection valve 32, the peristaltic pump 34 is selectively connected with the waste liquid container 36 and the pure water container 37 through the reversing valve, the capacitive proximity switch 14 is arranged on one side of a pipeline between the peristaltic pump 34 and the reversing valve, the capacitive proximity switch 14 is configured to detect whether liquid flows in the pipeline, and the sample injection valve 32, the peristaltic pump 34, the reversing valve 35 and the capacitive proximity switch 14 are respectively electrically connected with the controller.

In actual use, after insertion of the sample needle 3 into the sample bottle, the peristaltic pump 34 is activated to aspirate the sample from the sample bottle through the sample needle 3 and flow into the dosing ring 33 via the sample valve 32, while excess sample flows from the reversing valve 35 into the waste container 36 via the peristaltic pump 34. While the liquid flows in the connecting line between peristaltic pump 34 and reversing valve 35, it is detected by capacitive proximity switch 14 on one side; conversely, when peristaltic pump 34 is activated and no fluid flow is detected by capacitive proximity switch 14, no sample collection inflow is deemed, and the controller may be configured to stop peristaltic pump 34 from continuing to rotate in response to a no sample alarm.

Further, as shown in fig. 10, in order to facilitate the installation of the respective components, the sample valve 32, the peristaltic pump 34, the reversing valve 35 and the capacitive proximity switch 14 are disposed on the front panel 10 of the base 1, and the capacitive proximity switch 14 is located between the peristaltic pump 34 and the reversing valve 35.

Specifically, the front panel 10 of the base 1 is used for installing the sample injection valve 32, the peristaltic pump 34, the reversing valve 35, the capacitive proximity switch 14 and other components, and meanwhile, connecting pipelines among the sample injection valve 32, the peristaltic pump 34 and the reversing valve 35 can also be positioned through the front panel 10. The components are mounted on the front panel 10, so that on one hand, an operator can conveniently connect all the components in the liquid flow path through the connecting pipeline, and on the other hand, the components are convenient to disassemble, assemble and maintain in the later period.

In order to improve the use safety, a switchable panel cover 15 may be further disposed on the base 1, where the panel cover 15 covers the sample valve 32, the peristaltic pump 34, the reversing valve 35, and the capacitive proximity switch 14 in a closed state.

Specifically, during normal use, the panel cover 15 is in a closed state, and further, electrical components such as the sample injection valve 32, the peristaltic pump 34, the reversing valve 35, the capacitive proximity switch 14 and the like arranged on the front panel 10 are protected by the panel cover 15.

In addition, in order to facilitate the assembly of operators, a plurality of mounting ports 101 are provided on the front panel of the base 1, and the sample valve 32, peristaltic pump 34, reversing valve 35 and capacitive proximity switch 14 are inserted into the corresponding mounting ports 101. In the case of the sample injection valve 32, a first bracket 102 may be disposed on the front panel 10, the first bracket 102 being disposed on the back surface of the front panel 10, and the sample injection valve 32 being disposed on the first bracket 102. The sample valve 32 is firmly and reliably mounted on the front panel 10 through the first bracket 102. Similarly, in order to improve the mounting reliability of the reversing valve 35, a second bracket 103 may be provided on the front surface of the front panel 10 of the base 1, and the reversing valve 35 may be provided on the second bracket 103.

The peristaltic pump and the reversing valve are connected through a pipeline, the peristaltic pump is connected with the reversing valve through a pipeline, a liquid in the pipeline is detected to flow through the reversing valve, the peristaltic pump is started, the liquid in the sample bottle can be pumped through the sampling needle after the peristaltic pump is started, the liquid can be detected by the capacitive proximity switch to be normally used after flowing through the pipeline between the peristaltic pump and the reversing valve, and the controller of the automatic sampler can control the peristaltic pump to stop working when the liquid does not flow through the capacitive proximity switch after the peristaltic pump is started for a period of time, so that the peristaltic pump is prevented from idling for a long time and being damaged, further whether the liquid flows or not is automatically detected to prevent the automatic sampler from idling, and the use reliability of the automatic sampler is improved.

In order to improve the cleaning effect of the sample injection needle 3 and reduce the usage amount of the cleaning liquid to reduce the use cost, the automatic sample injector of the present embodiment improves the cleaning manner of the sample injection needle 3 as follows.

As shown in fig. 1 to 12, in order to satisfy the cleaning operation of the sample injection needle 3, the automatic sample injector is additionally provided with a cleaning seat 6, and the sample injection needle 3, the peristaltic pump 34, the waste liquid container 36, the pure water container 37 and the cleaning seat 6 constitute a sample injection needle cleaning module. Wherein, the top of the cleaning seat 6 is provided with a groove 61, the bottom of the groove 61 is provided with a blind hole 62 and a liquid discharging hole 63, and the blind hole 62 is configured for the insertion of the sample injection needle 3. The sample injection needle 3 is connected with a peristaltic pump 34 through a sample injection valve 32, and the peristaltic pump 34 is selectively connected with a waste liquid container 36 and a pure water container 37 through a reversing valve 35. In addition, the pure water in the pure water container 37 is discharged from the sample injection needle 3 into the blind hole 62 via the peristaltic pump 34, and the overflowed water from the blind hole 62 flows into the waste liquid container 36 via the drain hole 63.

In the actual use process, in the sample injection process of the sample injection needle, the peristaltic pump 34 rotates forward to perform sample injection, the reversing valve 35 switches the peristaltic pump 34 to communicate with the waste liquid container 36, and the specific sample injection process can refer to the description of the third embodiment, which is not repeated herein.

When the sample injection needle needs to be cleaned, the peristaltic pump 34 rotates reversely, and meanwhile, the reversing valve 35 switches the peristaltic pump 34 to be communicated with the pure water container 37. At the same time, the sample injection needle is driven to move and insert into the blind hole 62 by the movement mounting mechanism 4. The water in the pure water container 37 is sucked out and finally discharged from the sample injection needle into the blind hole 62, the liquid level in the blind hole 62 gradually rises along with the increase of the cleaning time, so that the outer wall of the sample injection needle can be cleaned, and excessive water overflows from the blind hole 62 and is discharged from the liquid discharge hole 63 to be conveyed into the waste liquid container 36. In the course of the water in the pure water container 37 being transported in the liquid flow path, the sample injection needle 3, the sample injection valve 32, the dosing ring 33, the peristaltic pump 34, and the reversing valve 35 are cleaned.

Because the aperture of the blind hole 62 is smaller, a smaller amount of water can fill the blind hole 62 to clean the outer wall of the sample injection needle. Also, during the cleaning process, the water in the pure water container 37 is not contaminated by any influence.

Further, in order to avoid splashing of the water output from the sample injection needle into the blind hole 62 during the cleaning process, a cover plate 64 may be further disposed on the upper portion of the cleaning seat 6, a through hole 65 is disposed on the cover plate 64, the cover plate 64 covers the groove 61, and the through hole 65 is disposed opposite to the blind hole 62.

Specifically, the cover plate 64 covers the upper portion of the groove 61 provided on the cleaning seat 6, during the cleaning process, the injection needle is inserted into the blind hole 62 through the through hole 65, and the water sprayed into the blind hole 62 by the injection needle can be blocked by the cover plate 64 at the top, so as to reduce the water splashing.

Still further, a waste liquid container 36 is arranged below the washing seat 6; the drain hole 63 is disposed opposite to the inlet of the waste liquid container 36, or the drain hole 63 communicates with the inlet of the waste liquid container 36.

Specifically, in order to facilitate the discharge of the waste liquid, the waste liquid container 36 may be disposed under the washing base 6, and the waste liquid discharged from the drain hole 63 of the washing base 6 flows into the waste liquid container 36 by gravity. In the case where the inlet size of the waste liquid container 36 is large, the drain hole 63 may be arranged directly above the inlet of the waste liquid container 36, or in the case where the inlet size of the waste liquid container 36 is small, communication may be performed between the drain hole 63 and the inlet of the waste liquid container 36 through a water pipe.

Further, for convenience of assembly, the waste liquid container 36 may be built in the base 1, the base 1 is provided with the socket 16, and the drain pipe of the waste liquid container 36 is inserted in the socket 16.

Specifically, the waste liquid container 36 is built in the base 1, and the drain pipe of the waste liquid container 36 is inserted in the socket 16, so that the user can conveniently drain the waste liquid by externally connecting a water pipe on the drain pipe.

The cleaning seat is configured to assist in cleaning the sample injection needle, the blind hole is formed in the cleaning seat and is used for the sample injection needle to be inserted into the blind hole when the sample injection needle is cleaned, the peristaltic pump sucks the pure water container and outputs the pure water from the sample injection needle so as to realize cleaning of an internal flow path of the sample injection needle, and pure water output from the sample injection needle is discharged into the blind hole so that the water level in the blind hole is quickly increased to submerge the sample injection needle, and further the outer wall of the sample injection needle is cleaned; in addition, in the cleaning process, pure water in the pure water container always keeps a clean state, and the volume of the blind hole is smaller, so that the use amount of pure water is greatly reduced in the cleaning process, the cleaning effect on the inside and outside of the sample injection needle is improved, the use amount of cleaning liquid is reduced, and the use cost is reduced.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. The sample injection needle cleaning module is characterized by comprising a sample injection needle, a peristaltic pump, a waste liquid container, a pure water container and a cleaning seat, wherein the sample injection needle, the peristaltic pump and the pure water container are sequentially connected; the top of the cleaning seat is provided with a groove, the bottom of the groove is provided with a blind hole and a liquid draining hole, and the blind hole is configured for the insertion of the sample injection needle;

2. The sample needle cleaning module according to claim 1, wherein a cover plate is further arranged on the upper portion of the cleaning seat, a through hole is formed in the cover plate, the cover plate covers the groove, and the through hole is arranged opposite to the blind hole.

3. The sample needle washing module of claim 1, wherein the waste container is disposed below the washing seat; the drain hole is arranged opposite to the inlet of the waste liquid container, or the drain hole is communicated with the inlet of the waste liquid container.

4. The sample needle cleaning module of claim 1, further comprising a controller, a sample valve, a capacitive proximity switch, and a reversing valve, the peristaltic pump being a bi-directional pump, the capacitive proximity switch being disposed on one side of a tubing between the peristaltic pump and the reversing valve, the capacitive proximity switch being configured to detect whether liquid is flowing in the tubing;

5. An automatic sampler comprising a base and a rotating disc, wherein a plurality of jacks are arranged on the rotating disc, and the rotating disc is rotatably arranged on the base.

6. The autoinjector of claim 5, wherein the sample injection valve, peristaltic pump, and reversing valve in the sample injection needle cleaning module are disposed on a front panel of the base.

7. The autoinjector of claim 5, further comprising a kinematic mounting mechanism including a post upstanding from the base and disposed on one side of the turn plate, a lifting seat slidably disposed up and down on the post, and a mounting arm laterally disposed and rotatably disposed on the lifting seat, the injection needle upstanding from and disposed on a free end of the mounting arm.

8. The autosampler according to claim 5, wherein the waste liquid container is built in the base, a socket is provided on the base, and a drain pipe of the waste liquid container is inserted in the socket.