CN115494188A - Multi-channel sample injection valve - Google Patents
Multi-channel sample injection valve Download PDFInfo
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- CN115494188A CN115494188A CN202211315713.8A CN202211315713A CN115494188A CN 115494188 A CN115494188 A CN 115494188A CN 202211315713 A CN202211315713 A CN 202211315713A CN 115494188 A CN115494188 A CN 115494188A
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- switching
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- sample injection
- injection valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
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Abstract
The invention relates to a multi-channel sample injection valve, which comprises: the inner side of the mounting valve body is coaxially provided with a speed change cavity, a detection cavity and a switching cavity; the power source is fixedly arranged on one side of the installation valve body and used for providing power; the speed regulating component is detachably inserted into the inner side of the speed changing cavity, and the power source can drive the speed regulating component to rotate; the detection part is rotatably arranged in the detection cavity, is connected with the output end of the speed regulation part and is used for detecting the rotating angle; and the switching seat part can be rotatably arranged on the inner side of the switching cavity, and the speed regulating part can drive the switching seat part to intermittently rotate to switch the flow channel. The invention has the advantages of high design precision, effective prevention of sample liquid leakage and liquid mixing, sensitive action and high sample introduction precision.
Description
Technical Field
The invention relates to the technical field of analytical instruments, in particular to a multi-channel sample injection valve.
Background
The sample injection valve is one of the key components for liquid injection of analytical instruments, and particularly in the field of chromatographic analysis, the sample injection valve is used for feeding a sample into a mobile phase of a high-pressure liquid flow or for flushing different component parts or for switching among a plurality of separation systems. The sample injection valve is used as an important component of a chromatographic analysis device, and the design and manufacturing precision, the automation degree and the reliability of the sample injection valve directly influence the analysis result. However, the prior sample injection valve still has the following technical problems:
1) The pressure resistance is poor, so that liquid leakage and liquid mixing phenomena occur;
2) When the sampling valve is used, the action sensitivity is poor, and the sampling fails because the valve is not in place;
3) When the material is blocked, the motor is very easy to damage.
In view of this, it is necessary to design a multi-channel sampling valve with good sealing performance, liquid leakage prevention, long service life and high reliability to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides the multi-channel sample injection valve which adopts full-automatic control, has high design precision, can effectively prevent sample leakage and liquid leakage from mixing, and has sensitive action, high sample injection precision, long service life and high reliability.
The technical scheme of the invention is as follows: a multi-channel sample injection valve, comprising:
the inner side of the mounting valve body is coaxially provided with a speed change cavity, a detection cavity and a switching cavity;
the power source is fixedly arranged on one side of the installation valve body and used for providing power;
the speed regulating component is detachably inserted into the inner side of the speed changing cavity, and the power source can drive the speed regulating component to rotate;
the detection part is rotatably arranged in the detection cavity, is connected with the output end of the speed regulation part and is used for detecting the rotating angle; and
the switching seat part is rotatably arranged on the inner side of the switching cavity, and the speed regulating part can drive the switching seat part to intermittently rotate to switch the flow channel;
wherein: the speed regulating component comprises an inner gear ring and a speed changing wheel group which is rotatably arranged on the inner side of the inner gear ring.
Wherein: the switching seat part comprises an upper cover, a compression ring, a stator element, a rotor seat, a valve core shaft, a bearing element, a butterfly spring, a shaft sleeve and a second bearing element which are coaxially arranged; the upper cover is locked on the mounting valve body through a compression ring; adjacent to the upper cover 、 The stator element, the rotor element and the rotor seat are connected in a positioning mode through a first positioning pin; the rotor seat is inserted into one end of the valve core shaft; the adjacent butterfly springs are symmetrically arranged and sleeved on the valve core shaft; the upper and lower sides of the stator element and the rotor element are closely attachedA piezoelectric ceramic piece is attached; when in switching, a circuit controls the piezoelectric ceramic piece to generate an electric field to contract, so that the power source can drive the rotor element to rotate and switch; when the piezoelectric ceramic piece is stable, a circuit controls the piezoelectric ceramic piece to generate an opposite electric field to expand the piezoelectric ceramic piece, so that the upper cover is ensured 、 A sealing connection between the stator element and the rotor element.
Wherein: a first elongated switching slot is arranged on the rotor element; a feeding runner is arranged in the middle of the upper cover; at least 10 inclined discharging channels are arranged along the circumferential side of the feeding channel in a circumferential array manner; a first annular groove is formed in the valve core shaft; the first annular groove is sleeved with a spacer bush which can be deformed in a telescopic mode, and the spacer bush is in sealing contact with the inner side of the detection cavity.
Wherein: arc-shaped object protrusions are symmetrically arranged on the peripheral side of the inner gear ring; the inner side of the inner gear ring is provided with a cavity for accommodating a speed change wheel set; a bottom plate is inserted at one side of the inner gear ring.
Wherein: the speed change wheel set comprises an upper fluted disc; a first gear is arranged on one side of the upper fluted disc in a circumferential array mode, and a second gear is arranged on the other side of the upper fluted disc in a circumferential array mode; a motor gear is meshed with the middle position of the first gear arranged in the circumferential array; and a rotating gear is meshed with the middle position of the second gear arranged in the circumferential array.
Wherein: an accommodating cavity is arranged in the middle of the rotating gear; the inner side surface of the accommodating cavity is coated with an insulating layer; the inner side of the accommodating cavity is filled with electrorheological fluid; electrodes are oppositely arranged on the inner walls of the two sides of the accommodating cavity, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid: when the power is on, the electrorheological fluid is solidified, and at the moment, the power source drives the switching seat component to rotate through the speed changing wheel group to complete switching.
Wherein: when the switching seat component is made of metal, the switching seat component can be selected as a positive electrode or a negative electrode in the electrode.
Wherein: the power source is a servo motor; the servo motor is fixedly arranged on the mounting valve body through a fastener.
Wherein: the detection part comprises an encoder and a light sensor; the encoder is fixedly arranged on a valve core shaft in the switching seat component through a clamping ring; the light sensor is inserted on the mounting valve body and extends into the inner side of the detection cavity.
Wherein: the multichannel sample injection valve also comprises a control module, and the control module is in insulated connection with the installation valve body; and the control module is in circuit connection with the power source, the speed regulating part, the detection part and the switching seat part.
Compared with the prior art, the invention has the following beneficial effects:
1) According to the multichannel sample injection valve provided by the invention, the power source is controlled to rotate through the control module to drive the switching seat component, specifically, the rotor component and the stator component are driven to rotate relatively in the rotating process, so that the switching of a liquid flow path is realized, the whole design effectively improves the design precision, the leakage and the liquid mixing of a sample are effectively prevented, and the action is sensitive, so that the sample injection precision is high, and in order to prolong the service life, the important stator component and the rotor component in the multichannel sample injection valve are not easily damaged due to the surface contact sealing fit, the wear resistance is improved, and the multichannel sample injection valve is made of ceramics, so that the service life is effectively prolonged, and particularly, the multichannel sample injection valve can be switched continuously for 5000000 times;
2) According to the multichannel sample injection valve provided by the invention, the plane thrust ball bearing and the disc spring are arranged in the valve body, the disc spring, the rotating shaft and the plane thrust ball bearing interact to provide a supporting pressing force for the rotating shaft, so that the rotor is pressed, the dynamic sealing of the rotor and the stator is realized, and then the piezoelectric ceramic piece is controlled to axially deform by controlling the on-off of the piezoelectric ceramic piece under the control of a circuit, so that the static sealing effect among a stator element, an upper cover and the rotor element is better, and the leakage and the liquid mixing of a sample are further effectively prevented;
4) The multichannel sample injection valve provided by the invention is positioned by arranging the detection component, specifically, the encoder is fixedly arranged on a valve core shaft in the switching seat component through a clamping ring, the light sensor is inserted into the mounting valve body and extends into the inner side of the detection cavity, the encoder and the light sensor are matched to detect the rotation angle and direction of the motor when in use, and then the rotation angle and direction of the motor can be accurately controlled through the control module and the detection component, so that the high precision and high sensitivity of flow path switching control are realized;
5) The invention arranges a containing cavity in the middle of the rotating gear; the inner side surface of the accommodating cavity is coated with an insulating layer; the inner side of the accommodating cavity is filled with electrorheological fluid; electrodes are oppositely arranged on the inner walls of the two sides of the accommodating cavity, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid, specifically, the electrorheological fluid is solidified when the power supply is electrified, and the power supply drives the switching seat component to rotate through the speed change wheel set to complete switching; when a phenomenon of jamming occurs in the rotating process, the control module immediately stops supplying power to the electrorheological fluid, the electrorheological fluid is instantly restored to be in a liquid state, the switching seat component stops rotating at the moment, and the power source continues to rotate, so that the motor is prevented from being damaged; the service life is further prolonged;
6) According to the invention, the rotating gear is provided with the accommodating cavity in the middle, and the inner side of the accommodating cavity is filled with the electrorheological fluid; when the switching is in place, the switching seat component can be immediately stopped rotating only by cutting off the power supply, the overlarge rotating angle caused by inertia is prevented, and the use precision is further improved.
Drawings
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
FIG. 1 is an exploded view of a multi-channel sample injection valve according to the present invention;
FIG. 2 is an exploded view of the timing member of the present invention;
FIG. 3 is a front view of the rotary gear of the present invention;
FIG. 4 is a circuit schematic of the control module of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Referring to fig. 1 to 4, a multi-channel sample injection valve includes: mounting valve body 1 、 Power source 2 、 Speed regulating part 3 、 Detecting member 5 、 The seat member 4 is switched. Wherein: a speed change cavity 11, a detection cavity 12 and a switching cavity 13 which are coaxially provided with columns are arranged at the inner side of the mounting valve body 1 and are used as a power source 2 、 Speed regulating part 3 、 Detecting part 4 、 The mounting of the switch seat part 5 provides support; the mounting valve body 1 comprises a first connecting part of a square object; one side of the first connecting part extends outwards to form a ring-shaped object bulge; an inwards concave sensor mounting groove is formed in the first connecting part; the power source 2 is fixedly arranged on the inner side of the first connecting part for installing the valve body and is used for providing power required during switching; the speed regulating component 3 is detachably inserted into the inner side of the speed changing cavity and used for reducing the rotating speed output at high speed to facilitate subsequent switching control, and the power source 2 can drive the speed regulating component 3 to rotate; the detection part 5 is rotatably arranged in the detection cavity 12, is connected with the output end of the speed regulation part 3 and is used for detecting the rotating angle; the switching seat part 4 is rotatably arranged inside the switching cavity 13, the speed regulating part 3 can drive the switching seat part 4 to intermittently rotate to change a flow passage, elements in the switching seat part are axially outwards protruded and deformed by electrifying when the switching seat part is switched in place during working so as to improve the sealing effect, and reverse voltage is applied during switching so as to generate an axial inwards concave shapeAnd the gap between the two parts is enlarged, so that the switching is convenient. Control the power supply through control module and rotate, drive and switch a seat part, it is concrete, rotate the in-process and rotate with stator component relatively through driving rotor element, realized the switching of liquid flow path, whole design has effectively improved the design accuracy, effectually prevents sample weeping, cluster liquid, and the action is sensitive simultaneously for it is high to advance the kind accuracy.
On the basis of the above embodiment, the switching seat section 4 includes the upper cover 41, the compression ring 42, the stator element 43, the rotor element 44, the rotor seat 45, the spool shaft 46, the bearing element 47, the disc spring 48, the shaft sleeve 49, and the second bearing element 410, which are coaxially disposed; the upper cover 41 is locked on the mounting valve body 1 through a compression ring 42; adjacent to the upper cover 41 、 The stator element 43, the rotor element 44 and the rotor seat 45 are connected in a positioning way through a first positioning pin; the rotor seat 45 is inserted into one end of the valve plug shaft 46; the butterfly springs 48 adjacent to each other are symmetrically arranged and sleeved on the valve core shaft 46; piezoelectric ceramic plates 7 are closely attached to the upper side and the lower side of the stator element 43 and the rotor element 44; when in switching, a circuit controls the piezoelectric ceramic piece 7 to generate an electric field to contract, so that the power source can drive the rotor element to rotate and switch; when the piezoelectric ceramic plate 7 is stable, a circuit controls the piezoelectric ceramic plate 7 to generate an opposite electric field to expand the piezoelectric ceramic plate so as to ensure that the upper cover is covered 、 A sealing connection between the stator element and the rotor element. In the embodiment, a bearing element 47 (a plane thrust ball bearing) and a disc spring are arranged in the valve body, the disc spring interacts with the rotating shaft and the plane thrust ball bearing to provide supporting pressing force for the rotating shaft, so that the rotor is pressed, the dynamic sealing between the rotor and the stator is realized, and then the piezoelectric ceramic piece is controlled to axially deform by controlling the on-off of the piezoelectric ceramic piece under the control of a circuit, so that the static sealing effect among the stator element, the upper cover and the rotor element is better, and the leakage and the liquid crossing of a sample are further effectively prevented. In order to prolong the service life, the important stator element and the rotor element are in surface contact sealing fit, are not easy to damage, improve the wear resistance, are made of ceramics, and effectively realize long service life, particularly continuous switching for 5000000 times.
On the basis of the above embodiment, a feeding channel is centrally arranged on the upper cover 41; at least 10 inclined discharging channels are arranged along the circumferential side of the feeding channel in a circumferential array manner; the rotor element 44 is provided with a first concave and non-penetrating elongated switching groove for connecting different discharging channels and feeding channels; a first annular groove is formed on the valve core shaft 46; the first annular groove is sleeved with a spacer bush which can be deformed in a telescopic mode, and the spacer bush is in sealing contact with the inner side of the detection cavity to guarantee sealing performance during working.
On the basis of the above embodiment, the speed adjusting component 3 includes the inner gear ring 31 and the speed changing wheel group 32 rotatably disposed inside the inner gear ring. Arc-shaped object protrusions are symmetrically arranged on the peripheral side of the inner gear ring 31 and used for positioning during installation and preventing the inner gear ring from rotating along with the inner gear ring during work; a cavity is arranged on the inner side of the inner gear ring 31 and used for accommodating a speed changing wheel group 32; a bottom plate 311 is inserted at one side of the inner ring gear 31 for protecting the transmission gear set 32 from falling.
On the basis of the above embodiment, the transmission pulley set 32 includes the upper toothed disc 321; a first gear 322 is arranged on one side of the upper fluted disc 321 in a circumferential array, and a second gear 323 is arranged on the other side of the upper fluted disc in a circumferential array; a motor gear 324 is meshed with the central position of the first gear arranged in the circumferential array; and a rotating gear 325 is engaged with the central position of the second gear arranged in the circumferential array.
On the basis of the above embodiment, the rotating gear 325 is centrally provided with an accommodating cavity 8; the inner side surface of the accommodating cavity 8 is coated with an insulating layer 81; the inner side of the accommodating cavity 81 is filled with electrorheological fluid 82; electrodes 83 are oppositely arranged on the inner walls of the two sides of the accommodating cavity 81, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes 83; one end of the switching seat part 4 is inserted into the electrorheological fluid: when the power source is electrified, the electrorheological fluid is solidified, and at the moment, the power source drives the switching seat component to rotate through the speed changing wheel set to complete switching. In the embodiment, an accommodating cavity is arranged in the center of the rotating gear; the inner side surface of the accommodating cavity is coated with an insulating layer; the inner side of the accommodating cavity is filled with electrorheological fluid; electrodes are oppositely arranged on the inner walls of the two sides of the accommodating cavity, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid, specifically, the electrorheological fluid is solidified when the power supply is electrified, and the power supply drives the switching seat component to rotate through the speed changing wheel group to complete switching; when the phenomenon of owner blockage occurs in the rotating process, the control module immediately stops supplying power to the electrorheological fluid, the electrorheological fluid is instantly restored to be in a liquid state, the switching seat component stops rotating at the moment, the power source continues to rotate, and the motor is guaranteed against being damaged; further improving the service life.
On the basis of the above embodiment, the switching seat member may be selected as a positive electrode or a negative electrode of the electrode when the switching seat member is made of a metal material.
On the basis of the above embodiment, the power source 2 is a servo motor; the servo motor is fixedly arranged on the mounting valve body through a fastener, and of course, in other embodiments, the power source 2 may also be a hydraulic or pneumatic or other mechanical structure that performs rotary motion, which is not limited in detail here.
On the basis of the above embodiment, the detecting part 5 includes the encoder 51 and the light sensor 52; the encoder 51 is fixedly arranged on a valve core shaft in the switching seat component 4 through a snap ring; the light sensor 52 is inserted into the valve body and extends into the detection cavity. The encoder is fixedly arranged on a valve core shaft in the switching seat component through a clamping ring, the light sensor is inserted into the mounting valve body and extends into the inner side of the detection cavity, the encoder is matched with the light sensor to detect the rotation angle and the direction of the motor during use, and then the rotation angle and the direction of the motor can be accurately controlled through the control module and the detection component, so that the high precision and the high sensitivity of flow path switching control are realized.
On the basis of the embodiment, the multi-channel sample injection valve further comprises a control module 9, and the control module is in insulated connection with the installation valve body; and the control modules are all in circuit connection with the power source, the speed regulating component, the detection component and the switching seat component.
In conclusion, the matching of all parts of the invention improves the design precision, prevents the sample from leaking and mixing liquid, and has sensitive action, thereby leading the sampling precision to be high.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multichannel sampling valve which is characterized in that: this multichannel sampling valve includes:
the inner side of the mounting valve body is coaxially provided with a speed change cavity, a detection cavity and a switching cavity;
the power source is fixedly arranged on one side of the installation valve body and used for providing power;
the speed regulating component is detachably inserted into the inner side of the speed changing cavity, and the power source can drive the speed regulating component to rotate;
the detection part is rotatably arranged in the detection cavity, is connected with the output end of the speed regulation part and is used for detecting the rotating angle; and
the switching seat part can be rotatably arranged on the inner side of the switching cavity, and the speed regulating part can drive the switching seat part to intermittently rotate to switch a flow channel;
wherein: the speed regulating component comprises an inner gear ring and a speed changing wheel group which is rotatably arranged on the inner side of the inner gear ring.
2. The multi-channel sample injection valve of claim 1, wherein: the switching seat part comprises an upper cover, a compression ring, a stator element, a rotor seat, a valve core shaft, a bearing element, a butterfly spring, a shaft sleeve and a second bearing element which are coaxially arranged; the upper cover is locked on the mounting valve body through a compression ring; adjacent to the upper cover 、 The stator element, the rotor element and the rotor seat are connected in a positioning mode through a first positioning pin; the rotor seat is inserted at one end of the valve plug shaft; the adjacent butterfly springs are symmetrically arranged and sleeved on the valve core shaft; the statorPiezoelectric ceramic plates are closely attached to the upper side and the lower side of the sub-element and the rotor element; when switching, a circuit controls the piezoelectric ceramic piece to generate an electric field to contract the piezoelectric ceramic piece so as to facilitate the power source to drive the rotor element to rotate and switch; when the piezoelectric ceramic piece is stable, a circuit controls the piezoelectric ceramic piece to generate opposite electric fields to enable the piezoelectric ceramic piece to expand, and the upper cover is ensured 、 A sealing connection between the stator element and the rotor element.
3. The multi-channel sample injection valve of claim 2, wherein: a first elongated switching groove is formed in the rotor element; a feeding runner is arranged in the middle of the upper cover; at least 10 inclined discharging channels are arranged along the circumferential side of the feeding channel in a circumferential array manner; the valve core shaft is provided with a first annular groove; the first annular groove is sleeved with a spacer bush which can be deformed in a telescopic mode, and the spacer bush is in sealing contact with the inner side of the detection cavity.
4. The multi-channel sample injection valve of claim 1, wherein: arc-shaped object convex parts are symmetrically arranged on the peripheral side of the inner gear ring; the inner side of the inner gear ring is provided with a cavity for accommodating a speed change wheel set; a bottom plate is inserted at one side of the inner gear ring.
5. The multi-channel sample injection valve of claim 4, wherein: the speed change wheel set comprises an upper fluted disc; a first gear is arranged on one side of the upper fluted disc in a circumferential array mode, and a second gear is arranged on the other side of the upper fluted disc in a circumferential array mode; a motor gear is meshed with the central position of the first gears arranged in the circumferential array; and a rotating gear is meshed with the middle position of the second gear arranged in the circumferential array.
6. The multi-channel sample injection valve of claim 5, wherein: an accommodating cavity is arranged in the middle of the rotating gear; the inner side surface of the accommodating cavity is coated with an insulating layer; the inner side of the accommodating cavity is filled with electrorheological fluid; electrodes are oppositely arranged on the inner walls of the two sides of the accommodating cavity, and an external circuit applies a strong electric field to the electrorheological fluid through the electrodes; one end of the switching seat component is inserted into the electrorheological fluid: when the power source is electrified, the electrorheological fluid is solidified, and at the moment, the power source drives the switching seat component to rotate through the speed changing wheel set to complete switching.
7. The multi-channel sample injection valve of claim 6, wherein: when the switching seat component is made of metal materials, the switching seat component can be selected as a positive electrode or a negative electrode in an electrode.
8. The multi-channel sample injection valve of claim 1, wherein: the power source is a servo motor; the servo motor is fixedly arranged on the mounting valve body through a fastener.
9. The multi-channel sample injection valve of claim 1, wherein: the detection part comprises an encoder and a light sensor; the encoder is fixedly arranged on a valve core shaft in the switching seat component through a clamping ring; the light sensor is inserted on the mounting valve body and extends into the inner side of the detection cavity.
10. The multi-channel sample injection valve of claim 1, wherein: the multichannel sampling valve also comprises a control module, and the control module is in insulated connection with the installation valve body; and the control modules are all in circuit connection with the power source, the speed regulating component, the detection component and the switching seat component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315713.8A CN115494188A (en) | 2022-10-26 | 2022-10-26 | Multi-channel sample injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315713.8A CN115494188A (en) | 2022-10-26 | 2022-10-26 | Multi-channel sample injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115494188A true CN115494188A (en) | 2022-12-20 |
Family
ID=85114743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211315713.8A Pending CN115494188A (en) | 2022-10-26 | 2022-10-26 | Multi-channel sample injection valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115494188A (en) |
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2022
- 2022-10-26 CN CN202211315713.8A patent/CN115494188A/en active Pending
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