CN110361493B - Multi-position automatic sample injection device - Google Patents
Multi-position automatic sample injection device Download PDFInfo
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- CN110361493B CN110361493B CN201910724282.2A CN201910724282A CN110361493B CN 110361493 B CN110361493 B CN 110361493B CN 201910724282 A CN201910724282 A CN 201910724282A CN 110361493 B CN110361493 B CN 110361493B
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- 238000002347 injection Methods 0.000 title claims abstract description 8
- 239000007924 injection Substances 0.000 title claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 116
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 25
- 244000273256 Phragmites communis Species 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 15
- 230000000712 assembly Effects 0.000 description 9
- 238000000429 assembly Methods 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 9
- 238000003795 desorption Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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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
- G01N30/24—Automatic injection systems
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- Automatic Analysis And Handling Materials Therefor (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a multi-position automatic sample injection device which comprises a sample tray assembly, a sampling assembly, a bracket and sample tubes, wherein the sample tray assembly and the sampling assembly are arranged on the bracket, a rotating shaft of a sample tray is in a horizontal direction, a plurality of sample tubes are uniformly distributed along the inner circle and the outer circle of the circumference of the sample tray assembly and are horizontally placed in parallel with the axial direction, and the sample tray assembly drives the sample tubes to move along the circumferential direction when rotating around the axis of the sample tray assembly. The sampling assembly is located below the sample tray assembly and is provided with a vertical lifting drive and an opening and closing drive along the axis of the sample tube. The sample tray assembly comprises a turntable, a turntable motor, a turntable drive and reeds, wherein a rotating shaft of the turntable is supported and installed on a support through a bearing, the turntable motor is also installed on the support, the turntable motor is connected with the rotating shaft of the turntable through turntable drive transmission, a plurality of reeds are arranged on the circumference of the turntable, and the reeds clamp a sample tube.
Description
Technical Field
The invention relates to the field of analytical instruments, in particular to a multi-position automatic sample injection device.
Background
The thermal desorption sample feeding technology is that a solid sample or an adsorption tube adsorbed with an object to be detected is placed in a thermal desorption device, the device is directly connected with a chromatograph (also provided with an independently installed model), and carrier gas enters a sample inlet of the chromatograph through the adsorption tube of the thermal desorption device. When the temperature of the thermal desorption device is increased, volatile components are released from the solid sample or the adsorbent and enter a gas chromatographic system along with carrier gas for analysis and measurement.
In the prior art, an automatic sample injection system of a thermal desorption instrument generally adopts a sample tube to pass through an upper sample disc and be fixed on a lower sample disc along the vertical direction (the lower sample disc is opened and is small Kong Fangbian for sampling and needling, but the sample tube cannot pass through the lower sample disc), and the upper sample disc and the lower sample disc are fixed on a shaft of a stepping motor through a connecting shaft. When the sample tray rotates by a certain angle under the drive of the stepping motor, and the upper and lower interfaces of the sample tube are just aligned with the upper and lower sampling needles (the upper and lower sampling needles are respectively arranged on the upper and lower electric push rods), the upper and lower electric push rods are started to sample
These sampling methods have the following disadvantages:
1. The sample tube is vertically arranged, and the filling material in the sample tube is quickly compacted under the action of gravity, so that a gap appears above the sample tube, and the sampling efficiency and the sampling flow are influenced uniformly;
2. sampling by adopting a needle-punched sealing gasket, wherein the sealing gasket of the sample tube is easy to be punched to cause air leakage of the sample tube, so that analysis accuracy is affected, and the sealing gasket of the sample tube needs to be replaced frequently;
3. the sample tubes are placed in the upper sample tray and the lower sample tray, and the holes of the upper sample tray and the lower sample tray are larger, so that the sample tubes are not firmly positioned on the sample trays, and the sampling is not easy;
4. the upper and lower sampling needles are respectively provided with an electric push rod, two motors are used, the occupied space is large, the energy consumption is high, and the use cost is high;
5. the sample tray is horizontally arranged, and the equipment occupies a large laboratory plane space.
Disclosure of Invention
The invention aims to provide a multi-position automatic sample injection device so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides a multiposition autosampler, includes sample dish subassembly, sampling subassembly, support and sample tube, and sample dish subassembly and sampling subassembly are installed on the support, and the rotation axis of sample dish is the horizontal direction, and a plurality of sample tubes are along the circumference inner circle and the outer lane evenly distributed of sample dish subassembly, be on a parallel with axis direction level and place, drive the sample tube and remove along the circumferencial direction when the sample dish subassembly rotates around its self axis. The sampling assembly is located below the sample tray assembly and is provided with a vertical lifting drive and an opening and closing drive along the axis of the sample tube.
The sample tube is horizontally arranged on the sample tray assembly, so that the phenomenon that samples in the sample tube are unevenly stacked due to the action of gravity can be prevented, and the desorption sample outlet effect during analysis is affected. When the sample tube reaches the lowest position along with the rotation of the sample tray, the sampling assembly ascends and clamps the sample tube from two ends, the sample tube is taken down and placed in the heating device, and then sample gas in the sample tube is led to the analyzer through the gas circuit. The sample tray is provided with the mounting positions of tens of sample tubes, and after the sample tubes are analyzed below, the sample tubes which are analyzed can be conveniently taken down and placed into new sample tubes for continuous analysis when the sample tubes are gradually rotated to the upper position along with the sample tray, so that continuous analysis of infinite number of samples is realized, and the convenience of a sample preparation process is greatly improved.
Further, the sample dish subassembly includes carousel, carousel motor, carousel drive and reed, and the pivot of carousel is supported through the bearing and is installed on the support, and the carousel motor is also installed on the support, and the carousel motor passes through carousel drive transmission with the pivot of carousel and is connected, is equipped with a plurality of reeds on the circumference of carousel, and the sample pipe is held to the reed.
The reed fixed on the circumference of the turntable clamps the sample tube, and in order to better utilize the space, the reed is provided with two staggered layers along the circumference of the turntable, so that the structure is compact. The sample tube is clamped by adopting the reed structure, and the process of putting in and taking out can be realized by overcoming the elastic force of the reed, so that the sample tube is very convenient. The turntable is driven to rotate by the turntable motor, and turntable driving between the turntable motor and the turntable motor can be in the form of a group of gears or worm gears, or in the form of a coupling, wherein the direction of an output shaft of the turntable motor can be changed by the installation mode of the worm gears or the bevel gears, so that the space requirement along the axial direction of the turntable can be saved in the design of the device, and the structure is compact.
Further, the sampling assembly comprises a bottom plate, a lifting driving assembly, a lifting seat plate, a clamping driving assembly, clamping plates, sampling head assemblies and a heating device, wherein the bottom plate is installed on a support through fasteners, the lifting driving assembly is connected with the bottom plate and the lifting seat plate, the lifting driving assembly drives the lifting seat plate to lift, the clamping driving assembly is connected with the lifting seat plate and the clamping plates, the clamping driving assembly drives the clamping plates to move along the axis of a sample tube, the sampling head assemblies are installed on the clamping plates, the sampling head assemblies are located on two sides of the sample tube in the axis direction of the sample tube, the heating device is installed on the bottom plate, and the heating device is located under the connecting line of the two sampling head assemblies.
As optimization, the heating device can be provided with a heat insulation layer outside.
The bottom plate is the basic mounting panel of other parts in the sampling subassembly, the bottom plate can be a part of support, the lifting drive subassembly that installs on the bottom plate drives the lifting seat board together with the part on it and carries out elevating movement, splint are connected to the lifting seat board through the centre gripping drive subassembly, not only obtain the elevating movement characteristic of lifting seat board, also can drive by the centre gripping drive subassembly, remove along the axis that parallels with the sample tube axis, splint lift and open and shut linkage, let the sample head subassembly rise to the both ends of carousel lowermost sample tube, the sample head subassembly is later in mutual proximity, grip sample tube both ends, then lift drive subassembly starts, take down the sample tube from the sample dish, let the sample tube descend to heating device on, afterwards heating device starts to heat the sample tube, the sample absorbed in the sample tube volatilizes and leaves the sample head subassembly and send to the analysis appearance through the plenum at both ends, after the analysis, the sample tube is held by the sample head subassembly, lift drive subassembly starts again, lift the structure of pushing back the sample dish again, then the sample head subassembly is kept away from each other, the sample tube is driven to the sample tube, lift drive subassembly descends together with the sample plate on it together with the upper plate, the sample tube is gone down to complete one time analysis cycle.
The movement limit positions of the lifting driving assembly and the clamping driving assembly can be determined in a limit switch mode, and the limit positions can be positioned by accurately controlling the running strokes of the lifting driving assembly and the clamping driving assembly because the structural sizes of the turntable and the sampling assembly of the device are already determined.
As optimization, the lifting driving assembly and the clamping driving assembly are driven in a screw rod mode;
The lifting driving assembly comprises a lifting motor, a lifting drive, a lifting screw nut and a lifting screw rod, wherein the lifting motor is arranged on the bottom plate or the bracket, two ends of the lifting screw rod are supported by bearings and vertically arranged on the bottom plate or the bracket, the lifting screw rod is screwed with the lifting screw nut, the lifting screw nut is fixedly connected with the lifting seat plate, and the lifting motor drives the lifting screw rod to rotate through the lifting drive;
The clamping driving assembly comprises a clamping motor, clamping transmission, clamping screw nuts and a clamping screw rod, the clamping motor is arranged on the lifting seat plate, two ends of the clamping screw rod are arranged on the lifting seat plate through bearing supports, the axis of the clamping screw rod is parallel to the axis of the sample tube, the clamping screw rod is screwed with two clamping screw nuts with opposite rotation directions, the clamping screw nuts are fixedly connected with the two clamping plates respectively, and the clamping motor drives the clamping screw rod to rotate through clamping transmission;
The lifting drive and the clamping drive are synchronous belt drive.
The driving of the screw rod form is compact in structural arrangement, and space is saved. During operation, the rotation of the lifting motor is transmitted to the lifting screw rod through lifting driving, the rotation of the lifting screw rod drives the lifting of the lifting screw rod nut to finish conversion of motion forms, and the rotation of the clamping screw rod is simultaneously transmitted to the two clamping screw rod nuts with opposite rotation directions, so that the rotation of the clamping screw rod can drive the two clamping plates to open and close. The transmission in the form of a screw pair also has a self-locking function, and only the screw can rotate to drive the screw nut to move, so that the screw nut cannot move reversely. In order to prevent loosening after long-time use or adjusting the installation distance during installation, a group of tensioning wheels can be added for tensioning.
As an optimization, the lifting motor and the clamping motor are stepping motors with worm and gear reducers. The lifting screw rod and the clamping screw rod do not need great speed, the motor is required to be decelerated, the stepping motor with the worm and gear reducer is convenient and accurate to control the movement stroke, a self-locking point is added at the motor, and the lifting seat plate and the clamping plate are prevented from being deviated after the motor stops moving.
As optimization, the clamping driving assembly further comprises a guide rod, two ends of the guide rod are connected to the lifting seat plate, the guide rod penetrates through the clamping plate, and a sliding sleeve or a linear bearing is arranged on the contact surface of the guide rod and the clamping plate; the lifting screw rod nut, the lifting screw rod, the clamping screw rod nut and the clamping screw rod are all ball screw pairs.
The guide rod enables the translation of the clamping plate to be smooth, and compared with a common threaded screw pair, the ball screw pair also operates more smoothly.
Further, the sample tube comprises a tube body and end caps arranged at two ends of the tube body, and the end caps are sealed by adopting a plug-in type disconnection structure: the end cap comprises an end cap, a spiral cover, a pin button and a spring, wherein the end cap is sleeved at two ends of the pipe body, a sealing ring is arranged on the circumferential contact surface of the pipe body and the end cap, a plurality of air passing holes are formed in the axial wall surface of the end cap, which is close to the pipe body, one end of the end cap, which is away from the pipe body, is a section of straight pipe, the straight pipe is internally provided with the pin button and the spring through the pin button, the outer wall of the straight pipe is screwed with the spiral cover, the spiral cover is internally provided with a stepped hole, the largest hole of the stepped hole is screwed with the end cap, the spiral cover and the end cap are provided with the sealing ring at the screwed position, the bottom of the stepped hole is outwards provided with a sampling hole, the pin button comprises a pin rod and a round table fixedly connected with one end of the pin rod, the pin rod faces the pipe body and is inserted into the center of the end cap, the round table is away from the pipe body, the spring is sleeved on the pin rod and is positioned between the round table and the end cap, the sealing ring is arranged between the bottom of the stepped hole and the round table of the spiral cover, the pin button is positioned in the stepped hole of the spiral cover under the reset state of the spring, and the sealing ring between the round table and the inner surface of the sampling hole is pressed tightly pressed under the reset state of the spring;
The sampling head assembly comprises a sampling tube, a sampling sealing ring and a tube holder, the tube holder is fixed on the clamping plate, the sampling tube comprises a column head, the sampling tube is inserted into the tube holder, the column head faces the sampling tube, an air guide hole extending from the surface to the center is formed in the column head, the sampling sealing ring is further sleeved on the column head, and the diameter of the column head is smaller than that of the sampling hole.
The end of the sample tube is sealed by adopting a pin button, a spring and a plurality of sealing rings, when sampling is carried out, a column head is inserted into a sampling hole and pushes a pin button round table to extrude the spring, the pin button round table and the sealing rings at the inner periphery of the sampling hole are separated, sample gas in the tube body can pass through a gas hole and bypass the pin button to contact with the column head, then reaches the end of the sampling tube from a gas guide hole on the surface of the column head and is guided to an analyzer through a subsequent pipeline, and when the sampling is carried out, the sampling sealing rings simultaneously abut against a spiral cover and the sampling tube, so that the sample gas is prevented from leaking out from a gap between the sampling hole and the column head.
The outside column head only needs to be inserted into the sampling hole to guide out the sample gas in the sample tube, and the sample tube can be pulled out after the operation is finished, and the plug-in connection does not damage the end sealing piece of the sample tube, so that the sample tube can be repeatedly used without worrying about the problem of the decline of the end sealing property.
Compared with the prior art, the invention has the beneficial effects that: the invention comprises the following steps:
1. The sample tube is horizontally arranged, so that the phenomena of uneven filling, void generation and the like of the filling caused by gravity and air flow impact under the condition of vertical placement are avoided;
2. The end cover of the sample tube adopts a novel disconnection mechanism, is not sealed by adopting a common sealing gasket mode, is sealed by adopting a sealing ring and a pin button mode, and can conveniently convert the sealed state into a sampling ventilation state when the sealing reliability is improved: when the pipeline is disconnected, the seal is automatically formed, and after the sampling pipeline is inserted, the spring is extruded to automatically form a gas passage;
3. The sample tube is arranged on the left reed and the right reed of the turntable, the sample tube is clamped by adopting a reed structure, and the automatic operation process of the sample tube placing and taking-out actions is convenient and reliable;
4. the left sampling tube and the right sampling tube are respectively arranged on screw nuts of the positive and negative teeth and driven by a worm gear and worm reduction stepping motor, and the left sampling tube and the right sampling tube easily enter two ends of the sampling tube for sampling;
5. the driving force of the screw rod adopts a stepping motor with a worm gear reducer. The driving mechanism has a self-locking function, can keep the moment unchanged in the state of power failure of the driving mechanism, and cannot leak air due to power failure;
6. the rotary table has a plurality of sample grades, the spaces are mutually independent, when the rotary table rotates to a certain angle, the sample tube which is analyzed is rotated to the upper part, an operator can take down the sample tube which is analyzed at any time, and replace a new sample tube, so that continuous analysis of infinite number is realized, and the efficiency is high;
7. the device is compact in whole, occupies small laboratory space and has large capacity.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a structural outline view of the present invention;
FIG. 2 is a schematic view of the structure of the sample tray assembly of the present invention;
FIG. 3 is a schematic diagram of a sampling assembly according to the present invention;
FIG. 4 is a schematic view of the mounting structure of the sample head assembly, heating device and sample tube of the present invention;
FIG. 5 is view A-A of FIG. 4;
Fig. 6 is a schematic view of the sample head assembly and sample tube of fig. 5 during sampling.
In the figure: 1-sample tray assembly, 11-carousel, 12-carousel motor, 13-carousel drive, 14-reed, 2-sampling assembly, 21-base plate, 22-lift drive assembly, 221-lift motor, 222-lift drive, 223-lift lead screw nut, 224-lift lead screw, 23-lift seat plate, 24-clamp drive assembly, 241-clamp motor, 242-clamp drive, 243-clamp lead screw nut, 244-clamp lead screw, 245-guide bar, 25-clamp plate, 26-sampling head assembly, 261-sampling tube, 2611-column head, 2612-air vent, 262-sampling seal ring, 263-tube holder, 27-heating device, 3-bracket, 9-sample tube, 91-tube body, 92-end cap, 921-air vent, 93-screw cap, 931-sampling hole, 94-pin knob, 95-spring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the multi-position automatic sample injection device comprises a sample tray assembly 1, a sampling assembly 2, a bracket 3 and sample tubes 9, wherein the sample tray assembly 1 and the sampling assembly 2 are arranged on the bracket 3, a plurality of sample tubes 9 are mutually parallel and horizontally arranged on the sample tray assembly 1, the part of the sample tray assembly 1, where the sample tubes 9 are arranged, can rotate around a horizontal axis parallel to the axis of the sample tubes 9, the sampling assembly 2 is positioned below the sample tray assembly 1, and the sampling assembly 2 is provided with a vertical lifting drive and an opening and closing drive along the axis of the sample tubes 9.
The sample tube 9 is horizontally arranged on the sample tray assembly 1, so that the sample in the sample tube 9 can be prevented from being piled up tightly due to the action of gravity, and the desorption sample outlet effect during analysis is influenced. When the sample tube 9 placed on the sample tray assembly 1 is rotated to the lowest position, the sampling assembly 2 is lifted and clamps the sample tube 9 from both ends, and then the sample gas in the sample tube 9 is led to the analyzer through the gas path. The rotating turntable can place a plurality of sample tubes 9 on the circumference, and after the sample tubes 9 are analyzed below, the analyzed tubes can be taken from above and placed into new sample tubes 9 for continuous analysis without stopping, so that the use efficiency is high.
As shown in fig. 2, the sample tray assembly 1 comprises a turntable 11, a turntable motor 12, a turntable drive 13 and reeds 14, wherein the rotating shaft of the turntable 11 is supported and installed on the bracket 3 through a bearing, the turntable motor 12 is also installed on the bracket 3, the turntable motor 12 is in transmission connection with the rotating shaft of the turntable 11 through the turntable drive 13, a plurality of reeds 14 are arranged on the circumference of the turntable 11, and the reeds 14 clamp the sample tube 9.
The reed 14 fixed on the circumference of the turntable 11 clamps the sample tube 9, for installation more firmly, the reed 14 is provided with two staggered layers on the radius of the turntable 11, as shown in fig. 2, the structure is compact, the space utilization rate is high, two or more reeds 14 are arranged at two ends of the sample tube 9 for clamping, the clamping mode of the reed 14 mode is very convenient for putting in and taking out, the turntable 11 can be driven to rotate by overcoming the elastic force only, the turntable motor 12 can drive the turntable 11 to rotate, the turntable drive 13 between the reeds can be in the mode of a group of gears or worm gears or the like, and can also be in the mode of a coupling, wherein the installation mode of the worm gears or a pair of bevel gears can change the output shaft direction of the turntable motor 12, the space requirement along the axial direction of the turntable 11 can be saved in the device design, and the structure is beneficial to compactness.
As shown in fig. 3, the sampling assembly 2 comprises a bottom plate 21, a lifting driving assembly 22, a lifting seat plate 23, a clamping driving assembly 24, clamping plates 25, sampling head assemblies 26 and a heating device 27, wherein the bottom plate 21 is installed on the support 3 by using fasteners, the lifting driving assembly 22 is connected with the bottom plate 21 and the lifting seat plate 23, the lifting driving assembly 22 drives the lifting seat plate 23 to lift, the clamping driving assembly 24 is connected with the lifting seat plate 23 and the clamping plates 25, the clamping driving assembly 24 drives the clamping plates 25 to move along the axis of the sample tube 9, the clamping plates 25 are provided with the sampling head assemblies 26, the sampling head assemblies 26 are located on two sides of the sample tube 9 in the axis direction of the sample tube 9, the heating device 27 is installed on the bottom plate 21, and the heating device 27 is located under the connecting line of the two sampling head assemblies 26.
The bottom plate 21 is a basic mounting plate of the rest parts in the sampling assembly 2, the bottom plate 21 can be a part of the bracket 3, the lifting driving assembly 22 arranged on the bottom plate 21 drives the lifting seat plate 23 to lift together with the parts on the lifting seat plate 23, the clamping plate 25 is connected to the lifting seat plate 23 through the clamping driving assembly 24, not only the lifting movement characteristics of the lifting seat plate 23 can be obtained, but also the clamping driving assembly 24 can drive the lifting seat plate to move along the axis parallel to the axis of the sample tube 9, the clamping plate 23 is in lifting and opening-closing linkage, the sampling head assembly 26 can be lifted to the two ends of the sample tube 9 at the lowest part of the turntable 11, the sampling head assembly 26 is mutually close after the sampling head assembly 26, the two ends of the sample tube 9 are clamped, then the lifting driving assembly 22 is started, the sample tube 9 is taken down, the sample tube 9 is lowered onto the heating device 27, then the heating device 27 is started to heat the sample tube 9, samples in the suction tube are separated from the sampling head assembly 26 through the air supply channels at the two ends and are sent to the analyzer, after analysis, the sampling head assembly 26 is closed, the sample tube 9 is clamped again, the lifting driving assembly 22 is started again, the sample tube 9 is lifted and the sample tube is lifted and moved to the sample tube 9 is completely and the sample tube 9 is lifted and moved to the sample tube 9 after the sample tube is completely and the sample tube is separated from the sample tube 9.
The movement limit positions of the lifting drive assembly 22 and the clamping drive assembly 24 can be determined by a limit switch, and the limit positions can be positioned by precisely controlling the running strokes of the lifting drive assembly 22 and the clamping drive assembly 24 because the structural sizes of the turntable 11 and the sampling assembly 2 of the device are already determined.
As shown in fig. 3, the lift drive assembly 22 and the clamp drive assembly 24 are both driven in the form of a lead screw;
The lifting driving assembly 22 comprises a lifting motor 221, a lifting driving 222, a lifting screw nut 223 and a lifting screw rod 224, wherein the lifting motor 221 is arranged on the bottom plate 21 or the bracket 3, two ends of the lifting screw rod 224 are supported by bearings and vertically arranged on the bottom plate 21 or the bracket 3, the lifting screw rod 224 is screwed with the lifting screw nut 223, the lifting screw nut 223 is fixedly connected with the lifting seat plate 23, and the lifting motor 221 drives the lifting screw rod 224 to rotate through the lifting driving 222;
The clamping driving assembly 24 comprises a clamping motor 241, a clamping transmission 242, a clamping screw nut 243 and a clamping screw 244, wherein the clamping motor 241 is arranged on the lifting seat plate 23, two ends of the clamping screw 244 are arranged on the lifting seat plate 23 through bearing supports, the axis of the clamping screw 244 is parallel to the axis of the sample tube 9, two clamping screw nuts 243 with opposite rotation directions are screwed on the clamping screw 244, the clamping screw nuts 243 are fixedly connected with the two clamping plates 25 respectively, and the clamping motor 241 drives the clamping screw 244 to rotate through the clamping transmission 242;
The lifting drive 222 and the clamping drive 242 are synchronous belt drives.
The driving of the screw rod form is compact in structural arrangement, space is saved, in operation, the rotation of the lifting motor 221 is transmitted to the lifting screw rod 224 through the lifting driving 222, the rotation of the lifting screw rod 224 drives the lifting screw rod nut 223 to lift, the conversion of the movement form is completed, and the rotation of the clamping screw rod 244 is simultaneously transmitted to the two clamping screw rod nuts 243 with opposite rotation directions, so that the rotation of the clamping screw rod 244 can drive the two clamping plates 25 to open and close. The transmission in the form of a screw pair also has a self-locking function, and only the screw can rotate to drive the screw nut to move, so that the screw nut cannot move reversely. In order to prevent loosening after long-time use or adjusting the installation distance during installation, a group of tensioning wheels can be added for tensioning.
The lift motor 221 and the clamp motor 241 are stepper motors with worm and gear reducers. The lifting screw rod 224 and the clamping screw rod 244 do not need to have large rotating speed, the motor needs to be decelerated, and the stepping motor with the worm and gear reducer is convenient and accurate to control the movement stroke, and a self-locking point is added at the motor to prevent the lifting seat plate 23 and the clamping plate 25 from shifting after the motor stops running.
As shown in fig. 3, the clamping driving assembly 24 further comprises a guide rod 245, two ends of the guide rod 245 are connected to the lifting seat plate 23, the guide rod 245 passes through the clamping plate 25, and a sliding sleeve or a linear bearing is arranged on the contact surface between the guide rod 245 and the clamping plate 25; the lifting screw nut 223 and the lifting screw 224, the clamping screw nut 243 and the clamping screw 244 are ball screw pairs.
The guide rod 245 allows the translation of the clamping plate 25 to be smoother and smoother, and the ball screw pair operates more smoothly than a common screw pair.
As shown in fig. 4 to 6, the sample tube 9 includes a tube body 91 and end caps disposed at two ends of the tube body 91, and the end caps are sealed by adopting a plug-in disconnection structure: the end cap comprises an end cap 92, a spiral cap 93, a pin button 94 and a spring 95, wherein the end cap 92 is sleeved at two ends of the tube body 91, a sealing ring is arranged on the circumferential contact surface of the tube body 91 and the end cap 92, the end cap 92 is abutted against the axial wall surface of the tube body 91, a plurality of air passing holes 921 are arranged on the axial wall surface of the pin rod, one end of the end cap 92, which is far away from the tube body 91, is a section of straight tube, the straight tube is internally provided with the spiral cap 93 through the pin button 94 and the spring 95, the outer wall of the straight tube is screwed with the spiral cap 93, a stepped hole is arranged in the spiral cap 93, the largest hole of the stepped hole is screwed with the end cap 92, the screwed position of the spiral cap 93 and the end cap 92 is provided with the sealing ring, the bottom of the stepped hole is outwards provided with a sampling hole 931, the pin button 94 comprises a pin rod and a round table fixedly connected with one end of the pin rod, the pin rod faces the center of the end cap 92, the round table is deviated from the tube body 91, the spring 95 is sleeved on the pin rod and is positioned between the round table and the end cap 92, the sealing ring is arranged between the bottom of the stepped hole and the pin button 94, and the round table of the round table is positioned in the round table 931 under reset state of the spring 95;
the sampling head assembly 26 comprises a sampling tube 261, a sampling sealing ring 262 and a tube holder 263, the tube holder 263 is fixed on the clamping plate 25, the sampling tube 261 comprises a column head 2611, the sampling tube 261 is inserted into the tube holder 263, the column head 2611 faces to the sample tube 9, an air guide hole 2612 extending from the surface to the center is formed in the column head 2611, the sampling sealing ring 262 is further sleeved on the column head 2611, and the diameter of the column head 2611 is smaller than that of the sampling hole 931.
The end of the sample tube 9 adopts a pin button 94, a spring 95 and a plurality of sealing rings for sealing, as shown in fig. 6, when sampling is performed, the column cap 2611 is inserted into the sampling hole 931 and pushes the pin button 94 to press the spring 95 in a round table, the round table of the pin button 94 and the sealing rings at the inner periphery of the sampling hole 931 are separated, the sample gas in the tube body 91 can pass through the air passing hole 921 and bypass the pin button 94 to contact with the column cap 2611, then reaches the end of the sampling tube 261 from the air guide hole 2612 on the surface of the column cap 2611 and is guided to the analyzer through a subsequent pipeline, and when sampling is performed, the sampling sealing rings 262 simultaneously abut against the spiral cover 93 and the sampling tube 261, so that the sample gas is prevented from leaking out from a gap between the sampling hole 931 and the column cap 2611.
The outside column head 2611 only needs to be inserted into the sampling hole 931 to guide out the sample gas in the sample tube 9, and the sample tube 9 can be pulled out after the operation is finished, and the plug-in connection does not damage the end sealing piece of the sample tube 9, so that the sample tube 9 can be reused for multiple times without worrying about the problem of the decline of the end sealing property.
The complete use process of the device is as follows: the operator manually puts a plurality of sample tubes 9 on the turntable 11, the turntable motor 12 is started, the turntable 11 is rotated by an angle to enable the sample tube 9 to be analyzed to reach the lowest position, then the lifting motor 221 is started, the lifting motor 221 is stopped when the sampling head assembly 26 is flush with the sample tube 9 on the turntable 11, the clamping motor 241 is started, the two sampling head assemblies 26 are mutually close, the column head 2611 is inserted into the sampling hole 931, the clamping motor 241 is started and stopped, the lifting motor 221 is started again, the sampling head assembly 26 descends, the sample tube 9 is taken off from the reed 14 and enters the heating device 27, the heating device 27 is started to heat the sample tube 9, sample gas leaves the device from the end of the sampling tube 261 and is led to a subsequent analyzer, after analysis, the heating device 27 is closed, the lifting motor 221 is started to enable the sample tube 9 to ascend and return to the turntable 11, the lifting motor 221 is stopped, the clamping motor 241 is started to enable the sampling head assembly 26 to loosen the sample tube 9, then the lifting motor 221 drives the sampling head assembly 26 to descend, and one analysis cycle is completed. At the same time of analysis, the operator can replace the sample tube 9 on the turntable 11 except at the lowermost position.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. A multiposition automatic sample feeding device is characterized in that: the automatic sample injection device comprises a sample disc assembly (1), a sampling assembly (2), a support (3) and sample tubes (9), wherein the sample disc assembly (1) and the sampling assembly (2) are arranged on the support (3), a rotating shaft of the sample disc assembly (1) is in a horizontal direction, a plurality of sample tubes (9) are parallel to the rotating shaft direction and uniformly placed in the circumference and on the outer ring of the sample disc assembly (1), the sample disc assembly (1) drives the sample tubes (9) to displace along the circumference direction of the sample disc when rotating around the axis of the sample disc assembly (1), the sampling assembly (2) is positioned below the sample disc assembly (1), and the sampling assembly (2) is provided with vertical lifting driving and opening and closing driving along the axis of the sample tubes (9);
The sample tray assembly (1) comprises a rotary tray (11), a rotary tray motor (12), a rotary tray drive (13) and reeds (14), wherein a rotating shaft of the rotary tray (11) is supported and installed on the support (3) through a bearing, the rotary tray motor (12) is also installed on the support (3), the rotary tray motor (12) is in transmission connection with the rotating shaft of the rotary tray (11) through the rotary tray drive (13), a plurality of reeds (14) are arranged on the circumference of the rotary tray (11), and the reeds (14) clamp the sample tube (9);
sampling subassembly (2) include bottom plate (21), lift drive assembly (22), lift bedplate (23), centre gripping drive assembly (24), splint (25), sampling head subassembly (26) and heating device (27), bottom plate (21) use the fastener to install on support (3), bottom plate (21) and lift bedplate (23) are connected to lift drive assembly (22), lift bedplate (23) are gone up and down in lift drive assembly (22), lift bedplate (23) and splint (25) are connected to centre gripping drive assembly (24), and centre gripping drive assembly (24) drive splint (25) move along sample cell (9) axis, install sampling head subassembly (26) on splint (25), sampling head subassembly (26) are located sample cell (9) both sides in sample cell (9) axis direction, heating device (27) are installed on bottom plate (21), and heating device (27) are located under two sampling head subassemblies (26) line.
2. The multi-bit autosampler of claim 1, wherein: the lifting driving component (22) and the clamping driving component (24) are driven in a screw rod mode,
The lifting driving assembly (22) comprises a lifting motor (221), a lifting driving assembly (222), a lifting screw nut (223) and a lifting screw rod (224), wherein the lifting motor (221) is arranged on the bottom plate (21) or the bracket (3), two ends of the lifting screw rod (224) are supported by bearings and vertically arranged on the bottom plate (21) or the bracket (3), the lifting screw nut (223) is screwed on the lifting screw rod (224), the lifting screw nut (223) is fixedly connected with the lifting seat plate (23), and the lifting motor (221) drives the lifting screw rod (224) to rotate through the lifting driving assembly (222);
the clamping driving assembly (24) comprises a clamping motor (241), a clamping transmission (242), a clamping screw nut (243) and a clamping screw (244), wherein the clamping motor (241) is arranged on the lifting seat plate (23), two ends of the clamping screw (244) are arranged on the lifting seat plate (23) through bearing supports, the axis of the clamping screw (244) is parallel to the axis of the sample tube (9), two clamping screw nuts (243) with opposite rotation directions are screwed on the clamping screw (244), the clamping screw nuts (243) are fixedly connected with the two clamping plates (25) respectively, and the clamping motor (241) drives the clamping screw (244) to rotate through the clamping transmission (242);
the lifting drive (222) and the clamping drive (242) are gear drive or synchronous belt drive.
3. The multi-bit autosampler of claim 2, wherein: the lifting motor (221) and the clamping motor (241) are motors with worm and gear reducers.
4. The multi-bit autosampler of claim 2, wherein: the clamping driving assembly (24) further comprises a guide rod (245), two ends of the guide rod (245) are connected to the lifting seat plate (23), the guide rod (245) penetrates through the clamping plate (25), and a sliding sleeve or a linear bearing is arranged on the contact surface of the guide rod (245) and the clamping plate (25); the lifting screw nut (223) and the lifting screw (224), the clamping screw nut (243) and the clamping screw (244) are all ball screw pairs.
5. The multi-bit autosampler of claim 1, wherein: the sample tube (9) comprises a tube body (91) and end caps arranged at two ends of the tube body (91), and the end caps are sealed by adopting a plug-in type disconnection structure: the end cap comprises an end cap (92), a spiral cap (93), a pin button (94) and a spring (95), wherein the end cap (92) is sleeved at two ends of the tube body (91), a sealing ring is arranged on the circumferential contact surface of the tube body (91) and the end cap (92), a plurality of air passing holes (921) are formed in the axial wall surface of the end cap (92) close to the tube body (91), one end of the end cap (92) deviating from the tube body (91) is a section of straight tube, the straight tube is internally provided with the spiral cap (93) through the pin button (94) and the spring (95), a stepped hole is formed in the spiral cap (93), the largest hole of the stepped hole is screwed with the end cap (92), a sealing ring is arranged at the screwed position of the spiral cap (93) and the end cap (92), a sampling hole (931) is formed at the bottom of the stepped hole, the pin button (94) comprises a pin rod and a round table fixedly connected to one end of the pin rod, the pin rod faces the tube body (91) and is inserted into the center of the end cap (92), the round table (91) deviating from the tube body (91), the spring (95) is sleeved on the pin rod and is located between the pin rod and the end cap (92), the stepped hole is located between the spiral cap and the spiral cap (93) and the spiral cap and the end cap (92), the spiral cap is located at the bottom of the stepped hole (93) and the bottom of the spiral cap (93) and the circular cap (95), the sealing ring between the round table of the pin button (94) and the inner surface of the sampling hole (931) is pressed tightly;
Sampling head subassembly (26) are including sampling pipe (261), sampling sealing washer (262) and pipe support (263), pipe support (263) are fixed on splint (25), sampling pipe (261) are including column cap (2611), and sampling pipe (261) are inserted pipe support (263), column cap (2611) are towards sample pipe (9), have seted up on column cap (2611) from surface extension to gas vent (2612) in center, still overlap on column cap (2611) and are equipped with sampling sealing washer (262), and column cap (2611) diameter is less than sampling hole (931) diameter.
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| CN111381008B (en) * | 2020-04-27 | 2020-12-25 | 江西农业大学 | Sample introduction method of multi-position automatic sample introduction device |
| CN116183792B (en) * | 2023-04-25 | 2023-07-04 | 河北普润环境工程有限公司 | Full-automatic thermal desorption device of rim plate material loading formula |
| CN117269385B (en) * | 2023-09-27 | 2024-05-14 | 济南铭域医学检验实验室有限公司 | Sample injection plate of liquid chromatograph tandem mass spectrometer |
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