CN210863648U

CN210863648U - Multi-position automatic sample introduction device

Info

Publication number: CN210863648U
Application number: CN201921267978.9U
Authority: CN
Inventors: 余青霓; 焦任鹏; 王际定; 赵小琴; 王志攀
Original assignee: Changzhou Panyu Instrument Co ltd
Current assignee: Changzhou Panyu Instrument Co ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-06-26
Anticipated expiration: 2029-08-07

Abstract

The utility model discloses a many autoinjectors, including sample dish subassembly, sampling subassembly, support and sample cell, sample dish subassembly and sampling unit mount are on the support, and the rotation axis of sample dish is the horizontal direction, and a plurality of sample cells are placed along the circumference inner circle and the outer lane evenly distributed of sample dish subassembly, be on a parallel with axis direction level, and the sample dish subassembly drives the sample cell and removes along the circumferencial direction when rotating around its self axis. The sampling assembly is positioned 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 rotary tray, a rotary tray motor, a rotary tray drive and reeds, wherein a rotary shaft of the rotary tray is supported and installed on the support through a bearing, the rotary tray motor is also installed on the support, the rotary tray motor is in transmission connection with the rotary shaft of the rotary tray through the rotary tray drive, a plurality of reeds are arranged on the circumference of the rotary tray, and the reeds clamp the sample tubes.

Description

Multi-position automatic sample introduction device

Technical Field

The utility model relates to an analytical instrument field specifically is a multiposition autoinjection device.

Background

The thermal desorption sampling technology is that a solid sample or an adsorption tube which adsorbs an object to be detected is placed in a thermal desorption device, the device is directly connected with a chromatograph (the device also has 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, the volatile components are released from the solid sample or the adsorbent and enter a gas chromatographic system along with the carrier gas for analysis and determination.

In the prior art, an automatic sample introduction system of a thermal desorption instrument generally adopts a sample tube to penetrate through an upper sample plate and be fixed on a lower sample plate along the vertical direction (a small hole is formed in the lower sample plate to facilitate sampling and needle pricking, but the sample tube cannot penetrate through the lower sample plate), and the upper sample plate and the lower sample plate are fixed on a shaft of a stepping motor through a connecting shaft. When the sample plate rotates by a certain angle under the drive of the stepping motor to make the upper and lower interfaces of the sample tube just align 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, the filler in the sample tube is quickly compacted under the action of gravity, and a gap is formed above the filler, so that the sampling efficiency is influenced and the sampling flow is uniform;

2. sampling is carried out by adopting a needle pricking sealing gasket mode, the sealing gasket of the sample tube is easy to be pricked to cause air leakage of the sample tube, so that the analysis accuracy is influenced, and therefore the sealing gasket of the sample tube needs to be frequently replaced;

3. the sample tubes are arranged in the upper sample plate and the lower sample plate, and the sample tubes are not firmly positioned on the sample plates due to the larger holes of the upper sample plate and the lower sample plate, so that the sampling is difficult;

4. the upper sampling needle and the lower sampling needle are respectively provided with an electric push rod, and two motors are used, so that the device occupies large space, has high energy consumption and is high in use cost;

5. the sample tray is horizontally arranged, and the equipment occupies a large plane space of a laboratory.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multiposition autoinjection device to solve the problem among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a many autoinjectors, includes sample dish subassembly, sampling subassembly, support and sample cell, 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 cells 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, and the sample dish subassembly drives the sample cell and removes along the circumferencial direction when rotatory around its self axis. The sampling assembly is positioned 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 disc component, so that the phenomenon that the samples in the sample tube are unevenly accumulated due to the action of gravity and the sample desorption effect is influenced during analysis can be prevented. When the sample tube reaches the lowest position along with the rotation of the sample tray, the sampling assembly ascends, clamps the sample tube from two ends, takes down the sample tube and places the sample tube in the heating device, and then leads the sample gas in the sample tube to the analyzer through the gas circuit. The sample tray is provided with dozens of sample tubes, and the sample tubes can be conveniently taken down and put into new sample tubes for continuous analysis after being analyzed below and gradually rotated to the upper position along with the sample tray, so that the continuous analysis of infinite-digit samples is realized, and the convenience of the sample preparation process is greatly improved.

Furthermore, the sample tray assembly comprises a rotary tray, a rotary tray motor, a rotary tray drive and reeds, a rotary shaft of the rotary tray is supported and installed on the support through a bearing, the rotary tray motor is also installed on the support, the rotary tray motor is in transmission connection with the rotary shaft of the rotary tray through the rotary tray drive, a plurality of reeds are arranged on the circumference of the rotary tray, and the reeds clamp the sample tubes.

The reeds fixed on the circumference of the turntable clamp the sample tube, and in order to better utilize the space, the reeds are provided with two staggered layers along the circumferential direction of the turntable, so that the structure is compact. The reed structure is adopted to clamp the sample tube, and the process of putting in and taking out can be realized only by overcoming the elastic force of the reed, so that the clamp is very convenient. The rotary table is driven to rotate by the rotary table motor, the rotary table between the rotary table and the rotary table can be driven to rotate by a group of gears or worm gears and the like, and can also be in a coupling mode, the direction of an output shaft of the rotary table motor can be changed by the installation mode of the worm gears or a pair of bevel gears, the space requirement along the axial direction of the rotary table can be saved in the design of the device, and the compact structure is facilitated.

Further, the sampling subassembly includes the bottom plate, the lift drive assembly, the lift bedplate, centre gripping drive assembly, splint, sampling head subassembly and heating device, the bottom plate uses the fastener to install on the support, lift drive assembly connects bottom plate and lift bedplate, lift drive assembly drive lift bedplate goes up and down, centre gripping drive assembly connects lift bedplate and splint, centre gripping drive assembly drive splint move along the sample tube axis, install the sampling head subassembly on the splint, the sampling head subassembly is located the sample tube both sides on the sample tube axis direction, heating device installs on the bottom plate, heating device is located two sampling head subassembly lines under.

As optimization, the heat insulation layer can be arranged outside the heating device.

The bottom plate is a basic mounting plate for other parts in the sampling assembly, the bottom plate can be a part of a bracket, a lifting driving assembly arranged on the bottom plate drives a lifting seat plate to carry out lifting motion together with the parts on the lifting seat plate, the clamping plates are connected to the lifting seat plate through a clamping driving assembly, the lifting motion characteristics of the lifting seat plate can be obtained, the lifting seat plate can also be driven by the clamping driving assembly to move along an axis parallel to the axis of the sample tube, the clamping plates are in lifting and opening and closing linkage, the sampling head assembly can be lifted to two ends of the sample tube at the lowest part of the turntable, the sampling head assembly is close to each other to clamp two ends of the sample tube, then the lifting driving assembly is started, the sample tube is taken down from the sample plate, the sample tube is lowered onto a heating device, then the heating device is started to heat the sample tube, and the sample adsorbed in the sample tube is volatilized to leave the sampling, after the analysis is finished, the heating device is closed, the sampling head assembly clamps the sample tube, the lifting driving assembly is started again, the sample tube is lifted and pushed back to the reed structure of the sample tray again, then the sampling head assemblies are mutually far away, the sample tube is loosened, and the lifting driving assembly drives the lifting base plate to descend together with the upper part of the lifting base plate, so that an analysis period is completed.

The movement limit positions of the lifting driving component and the clamping driving component can be determined through the form of a limit switch, and the limit position positioning can be carried out by accurately controlling the running strokes of the lifting driving component and the clamping driving component because the structural sizes of the turntable and the sampling component of the device are 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 driver, a lifting screw nut and a lifting screw rod, the lifting motor is installed on the bottom plate or the support, two ends of the lifting screw rod are supported by bearings and are vertically installed on the bottom plate or the support, 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 driver;

the clamping driving assembly comprises a clamping motor, a clamping transmission, a clamping screw nut and a clamping screw rod, the clamping motor is installed on the lifting seat plate, two ends of the clamping screw rod are supported and installed on the lifting seat plate through bearings, the axis of the clamping screw rod is parallel to the axis of the sample tube, the clamping screw rod is screwed with the 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 the clamping transmission;

the lifting drive and the clamping drive are synchronous belt drive.

The screw rod type driving is compact in structural arrangement, and space is saved. When the clamping device runs, the rotation of the lifting motor is transmitted to the lifting screw rod through the lifting drive, the lifting screw rod rotates to drive the lifting screw rod nut to lift, the motion form conversion is completed, and similarly, the rotation of the clamping screw rod is transmitted to the two clamping screw rod nuts rotating in opposite directions simultaneously, so that the rotation of the clamping screw rod can drive the two clamping plates to open and close. The transmission of the screw pair form also has a self-locking function, only the screw can rotate to drive the screw nut to move, and the screw nut cannot move reversely. The synchronous belt transmission can be tensioned by adding a set of tension wheels in order to prevent looseness after long-time use or adjustment of installation distance during installation.

Preferably, 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 to be very high in speed, the motor needs to be decelerated, the step motor with the worm gear reducer is convenient and accurate in movement stroke control, a self-locking point is additionally arranged at the motor, and the lifting seat plate and the clamping plate are prevented from being shifted 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 rod pairs.

The guide rod enables the clamp plate to move more stably and smoothly, and the ball screw pair also runs more smoothly compared with a common threaded screw pair.

Further, the sample cell includes body and the end cap of setting at the body both ends, and the end cap adopts plug-in to disconnect the structure and seals: the end cap comprises an end cover, a rotary cover, a pin button and a spring, the end cover is sleeved at two ends of the tube body, a sealing ring is arranged on the circumferential contact surface of the tube body and the end cover, a plurality of air passing holes are arranged on the axial wall surface of the end cover close to the tube body, one end of the end cover, which is far away from the tube body, is a section of straight tube, the pin button and the spring pass through the straight tube, the rotary cover is screwed on the outer wall of the straight tube, a stepped hole is arranged in the rotary cover, the largest hole of the stepped hole is screwed on the end cover, the sealing ring is arranged at the screwed part of the rotary cover and the end cover, a sampling hole is arranged at the bottom of the stepped hole outwards, the pin button comprises a pin rod and a round platform fixedly connected with one end of the pin rod, the pin rod faces the center of, under the reset state of the spring, the round pin knob platform is positioned in the screw cap stepped hole, and the sealing ring between the round pin knob platform and the inner surface end face of the sampling hole is compressed;

the sampling head subassembly includes sampling pipe, sampling sealing washer and conduit saddle, and the conduit saddle is fixed on splint, and the sampling pipe includes the column cap, and the sampling pipe inserts conduit saddle, column cap orientation sample cell, sets up the gas guide hole that extends to the center from the surface on the column cap, still overlaps on the column cap to be equipped with the sampling sealing washer, and the column cap diameter is less than the sampling hole diameter.

The tip of sample cell adopts the round pin button, spring and some sealing washers are used for sealing, when the sampling, the column cap inserts in the sampling hole and promotes round pin button round platform extrusion spring, round pin button round platform and the inboard outlying sealing washer of sampling hole throw off, sample gas in the barrel can be in order to pass through the gas pocket and walk around round pin button and column cap contact, then the tip that reaches the sampling tube from the gas guide hole on the column cap surface leads to the analysis appearance through follow-up pipeline, during the sampling, the sampling sealing washer supports simultaneously and leans on spiral cover and sampling tube, prevent that sample gas from leaking away from the gap department of sampling hole and column cap.

The external column cap can guide out the sample gas in the sample tube only by being inserted into the sampling hole, and the sample gas can be pulled out after the operation is finished.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses:

1. the sample tube is horizontally arranged, so that the phenomena of nonuniform filling, gap generation and the like of the filler caused by gravity and airflow impact under the condition of vertical placement are avoided;

2. the sample cell end cover adopts new disconnected mechanism, does not adopt common gasket mode to seal, seals with sealing washer and round pin button form, when increasing the sealing reliability, and the sample cell can conveniently be converted into the sampling state of ventilating from the encapsulated situation: when the pipeline is disconnected, the sealing is automatically formed, and the sampling pipeline is inserted to extrude the spring to automatically form a gas passage;

3. the sample tube is arranged on the left and right spring plates of the turntable, the sample tube is clamped by adopting a spring plate structure, and the automatic operation process of the sample tube placing and taking actions is convenient and reliable;

4. the left and right sampling tubes are respectively arranged on the screw rod nuts of the positive and negative teeth and are driven by a worm and gear speed reduction stepping motor, and the left and right sampling tubes can easily enter the two ends of the sample tubes for sampling;

5. the driving force of the screw rod adopts a stepping motor with a worm gear speed reducer. The driving mechanism has a self-locking function, can keep the moment unchanged in the power-off state of the driving mechanism, and cannot leak air due to power-off;

6. the rotary disc has a plurality of sample grades, the spaces are mutually independent, when the rotary disc rotates to a certain angle, the sample tube which completes analysis is rotated to the upper part, an operator can take down the analyzed sample tube at any time and replace the sample tube with a new sample tube, the infinite number continuous analysis is realized, and the efficiency is high;

7. the device is compact as a whole, occupies small laboratory space and has large capacity.

Drawings

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

FIG. 1 is a structural outline view of the present invention;

FIG. 2 is a schematic diagram of a sample tray assembly according to the present invention;

fig. 3 is a schematic structural diagram of the sampling assembly of the present invention;

FIG. 4 is a schematic view of the mounting structure of the sampling head assembly, the heating device and the sample tube according to the present invention;

FIG. 5 is view A-A of FIG. 4;

fig. 6 is a schematic structural diagram of the sampling head assembly and the sample tube in the sampling process in fig. 5.

In the figure: 1-sample disk assembly, 11-rotary disk, 12-rotary disk motor, 13-rotary disk transmission, 14-reed, 2-sampling assembly, 21-bottom plate, 22-lifting driving assembly, 221-lifting motor, 222-lifting transmission, 223-lifting screw nut, 224-lifting screw, 23-lifting seat plate, 24-clamping driving assembly, 241-clamping motor, 242-clamping transmission, 243-clamping screw nut, 244-clamping screw, 245-guide rod, 25-clamping plate, 26-sampling head assembly, 261-sampling tube, 2611-column cap, 2612-air guide hole, 262-sampling sealing ring, 263-tube holder, 27-heating device, 3-bracket, 9-sample tube, 91-tube body, tube body, 92-end cover, 921-air passing hole, 93-screw cover, 931-sampling hole, 94-pin button and 95-spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, the multi-position automatic sample feeding device comprises a sample tray assembly 1, a sampling assembly 2, a support 3 and sample tubes 9, wherein the sample tray assembly 1 and the sampling assembly 2 are mounted on the support 3, a plurality of sample tubes 9 are parallel to each other and horizontally arranged on the sample tray assembly 1, the parts of the sample tray assembly 1 for placing the sample tubes 9 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 stacked tightly and compactly under the action of gravity, and the sample desorption effect is prevented when the 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 holds 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 at the lower part, the analyzed tubes can be taken from the upper part and new sample tubes 9 can be placed in the sample tubes, and the continuous analysis is carried out without stopping, so that the use efficiency is high.

As shown in fig. 2, the sample tray assembly 1 includes a rotary tray 11, a rotary tray motor 12, a rotary tray driver 13 and reeds 14, a rotating shaft of the rotary tray 11 is supported and mounted on the bracket 3 through a bearing, the rotary tray motor 12 is also mounted on the bracket 3, the rotary tray motor 12 is in transmission connection with the rotating shaft of the rotary tray 11 through the rotary tray driver 13, a plurality of reeds 14 are arranged on the circumference of the rotary tray 11, and the reeds 14 hold the sample tube 9.

The reeds 14 fixed on the circumference of the turntable 11 clamp the sample tube 9, in order to be more stable in installation, the reeds 14 are 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 modes of the reeds 14 are convenient to put in and take out, only elastic force needs to be overcome, the turntable 11 is driven to rotate by the turntable motor 12, the turntable drive 13 between the reeds can be in the form of a group of gears or worm gears and the like, and can also be in the form of a coupling, wherein the installation mode of the worm gears or a pair of bevel gears can change the direction of an output shaft of the turntable motor 12, the space requirement along the axial direction of the turntable 11.

As shown in fig. 3, the sampling assembly 2 includes a bottom plate 21, a lifting driving assembly 22, a lifting seat plate 23, a clamping driving assembly 24, a clamping plate 25, a sampling head assembly 26 and a heating device 27, the bottom plate 21 is mounted on the bracket 3 by using a fastener, 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 plate 25, the clamping driving assembly 24 drives the clamping plate 25 to move along the axis of the sample tube 9, the sampling head assembly 26 is mounted on the clamping plate 25, the sampling head assembly 26 is located on two sides of the sample tube 9 in the axis direction of the sample tube 9, the heating device 27 is mounted on the bottom plate 21, and the heating device 27 is.

The bottom plate 21 is a basic mounting plate for the rest of the components in the sampling assembly 2, the bottom plate 21 can be a part of the bracket 3, the lifting driving assembly 22 mounted on the bottom plate 21 drives the lifting seat plate 23 to perform lifting motion together with the components thereon, the clamping plate 25 is connected to the lifting seat plate 23 through the clamping driving assembly 24, not only the lifting motion characteristic of the lifting seat plate 23 is obtained, but also the lifting driving assembly 24 can be driven to move along an axis parallel to the axis of the sample tube 9, the clamping plate 23 is lifted and opened and closed in linkage, so that the sampling head assembly 26 can be lifted to two ends of the sample tube 9 at the lowest part of the turntable 11, the sampling head assemblies 26 are close to each other to clamp two ends of the sample tube 9, then the lifting driving assembly 22 is started to take down the sample tube 9, the sample tube 9 is lowered onto the heating device 27, and then the heating device 27 is started to heat, desorbing the sample in the tube, leaving the sampling head assembly 26 through the air supply channels at two ends and sending the sample to the analyzer, after the analysis is finished, closing the heating device 27, clamping the sample tube 9 by the sampling head assembly 26, starting the lifting driving assembly 22 again, sending the sample tube 9 back to the turntable 11 again, then keeping the sampling head assemblies 26 away from each other, loosening the sample tube 9, and driving the lifting seat plate 23 to descend together with the upper part of the lifting seat plate 22 by the lifting driving assembly 22 to finish an analysis period.

The movement limit positions of the lifting drive assembly 22 and the clamping drive assembly 24 can be determined by the form of limit switches, and since the structural dimensions of the rotary disk 11 and the sampling assembly 2 of the device are determined, the limit position positioning can also be carried out by accurately controlling the running strokes of the lifting drive assembly 22 and the clamping drive assembly 24.

As shown in fig. 3, the lifting driving assembly 22 and the clamping driving assembly 24 are driven by screw rods;

the lifting driving assembly 22 comprises a lifting motor 221, a lifting driver 222, a lifting screw nut 223 and a lifting screw 224, wherein the lifting motor 221 is installed on the bottom plate 21 or the bracket 3, two ends of the lifting screw 224 are supported by bearings and are vertically installed on the bottom plate 21 or the bracket 3, the lifting screw nut 223 is screwed on the lifting screw 224, the lifting screw nut 223 is fixedly connected with the lifting seat plate 23, and the lifting motor 221 drives the lifting screw 224 to rotate through the lifting driver 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, the clamping motor 241 is installed on the lifting seat plate 23, two ends of the clamping screw 244 are supported and installed on the lifting seat plate 23 through bearings, 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 respectively and fixedly connected with the two clamping plates 25, and the clamping motor 241 drives the clamping screw 244 to rotate through the clamping transmission 242;

the elevation drive 222 and the clamping drive 242 are synchronous belt drives.

The screw type drive is compact in structural arrangement, space is saved, when the lifting screw is in operation, the rotation of the lifting motor 221 is transmitted to the lifting screw 224 through the lifting drive 222, the rotation of the lifting screw 224 drives the lifting screw nut 223 to lift, the motion form conversion is completed, similarly, the rotation of the clamping screw 244 is transmitted to the two clamping screw nuts 243 with opposite rotation directions, and therefore the rotation of the clamping screw 244 can drive the two clamping plates 25 to open and close. The transmission of the screw pair form also has a self-locking function, only the screw can rotate to drive the screw nut to move, and the screw nut cannot move reversely. The synchronous belt transmission can be tensioned by adding a set of tension wheels in order to prevent looseness after long-time use or adjustment of installation distance during installation.

The lifting motor 221 and the clamping motor 241 are stepping motors with worm gear reducers. The lifting screw rod 224 and the clamping screw rod 244 do not need to rotate at a large speed and need to reduce the speed of the motor, and the stepping motor with the worm gear reducer not only can conveniently and accurately control the movement stroke, but also can increase a self-locking point at the position of 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 includes 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 a contact surface of the guide rod 245 and the clamping plate 25; the elevation screw nut 223 and the elevation screw 224, and the clamping screw nut 243 and the clamping screw 244 are all ball screw pairs.

The guide rods 245 allow the clamping plate 25 to translate more smoothly and smoothly, and the ball screw pair also operates more smoothly than a conventional threaded screw pair.

As shown in fig. 4-6, 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 adopt a plug-in disconnection structure for sealing: the end cap comprises an end cover 92, a rotary cover 93, a pin knob 94 and a spring 95, wherein the end cover 92 is sleeved at two ends of a pipe body 91, a sealing ring is arranged on the circumferential contact surface of the pipe body 91 and the end cover 92, a plurality of air passing holes 921 are arranged on the axial wall surface of the end cover 92 close to the pipe body 91, one end of the end cover 92, which is far away from the pipe body 91, is a straight pipe, a pin knob 94 and the spring 95 pass through the straight pipe, the rotary cover 93 is screwed on the outer wall of the straight pipe, a stepped hole is arranged in the rotary cover 93, the largest hole of the stepped hole is screwed with the end cover 92, the sealing ring is arranged at the screwed position of the rotary cover 93 and the end cover 92, a sampling hole 931 is arranged at the bottom of the stepped hole outwards, the pin knob 94 comprises a pin rod and a circular table fixedly connected with one end of the pin rod, the pin rod faces the pipe body 91 and is inserted into the center, in the reset state of the spring 95, the circular truncated cone of the pin knob 94 is positioned in the stepped hole of the screw cap 93, and the sealing ring between the circular truncated cone of the pin knob 94 and the inner surface end face of the sampling hole 931 is pressed;

the sampling head assembly 26 comprises a sampling tube 261, a sampling sealing ring 262 and a tube support 263, wherein the tube support 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 support 263, the column head 2611 faces the sampling tube 9, an air guide hole 2612 extending from the surface to the center is formed in the column head 2611, the column head 2611 is further sleeved with the sampling sealing ring 262, and the diameter of the column head 2611 is smaller than that of the sampling hole 931.

The end of the sample tube 9 is sealed by the pin knob 94, the spring 95 and some sealing rings, as shown in fig. 6, during sampling, the column head 2611 is inserted into the sampling hole 931 and pushes the truncated cone of the pin knob 94 to press the spring 95, the truncated cone of the pin knob 94 and the sealing ring on the inner periphery of the sampling hole 931 are disengaged, the sample gas in the tube body 91 can pass through the air passing hole 921 and contact the column head 2611 by the pin knob 94, then the sample gas is guided to the analyzer through the subsequent pipeline from the air guide hole 2612 on the surface of the column head 2611 to the end of the sampling tube 261, and during sampling, the sampling sealing ring 262 simultaneously abuts against the screw cap 93 and the sampling tube 261 to prevent the sample gas from leaking out from the gap between the sampling hole 931 and the column head.

The external column cap 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 gas is pulled out after the operation is finished, and the plug-in connection does not damage the end sealing element of the sample tube 9, so that the sample tube 9 can be repeatedly used for many times without worrying about the problem of end sealing performance reduction.

The complete use process of the device is as follows: an operator manually puts sample tubes 9 on a rotary table 11, a rotary table motor 12 is started, the rotary table 11 is rotated by an angle to enable the sample tubes 9 to be analyzed to reach the lowest position, then a lifting motor 221 is started, a lifting motor 221 is stopped when a sampling head assembly 26 is flush with the sample tubes 9 on the rotary table 11, a clamping motor 241 is started, two sampling head assemblies 26 are close to each other, a column head 2611 is inserted into a 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 tubes 9 are taken down from a reed 14 to a heating device 27, the heating device 27 is started to heat the sample tubes 9, sample gas leaves the device from the end part of a sampling tube 261 and is led to a subsequent analyzer, after analysis is finished, the heating device 27 is closed, the lifting motor 221 is started, the sample tubes 9 are lifted and returned to the rotary table 11, and the lifting motor 221 is stopped, the clamping motor 241 is started to let the sampling head assembly 26 release the sample tube 9, and then the lifting motor 221 drives the sampling head assembly 26 to descend, thereby completing an analysis cycle. While analyzing, the operator can replace the sample tube 9 at a position other than the lowermost position on the turntable 11.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. 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

1. The utility model provides a multiposition autoinjection device which characterized in that: the automatic sampling 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 installed on the support (3), the rotating shaft of the sample disc assembly (1) is in the horizontal direction, a plurality of sample tubes (9) are parallel to the rotating shaft direction and are uniformly placed on the inner ring and the outer ring of the circumference of the sample disc assembly (1), the sample disc assembly (1) drives the sample tubes (9) to displace along the circumferential direction of the sample disc when rotating around the axis of the sample disc assembly (1), the sampling assembly (2) is located below the sample disc 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).

2. The multi-position automatic sample introduction device according to claim 1, wherein: sample disc subassembly (1) is including carousel (11), carousel motor (12), carousel drive (13) and reed (14), the pivot of carousel (11) is passed through the bearing support and is installed on support (3), and carousel motor (12) also installs on support (3), and carousel motor (12) pass through carousel drive (13) transmission with the pivot of carousel (11) and are connected, be equipped with a plurality of reeds (14) on the circumference of carousel (11), sample cell (9) are held in reed (14).

3. The multi-position automatic sample introduction device according to claim 1, wherein: the sampling assembly (2) comprises a bottom plate (21), a lifting driving assembly (22), a lifting seat plate (23), a clamping driving assembly (24), a clamping plate (25), a sampling head assembly (26) and a heating device (27), wherein the bottom plate (21) is installed on a support (3) by using a fastener, 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 plate (25), the clamping driving assembly (24) drives the clamping plate (25) to move along the axis of the sample tube (9), the sampling head assembly (26) is installed on the clamping plate (25), the sampling head assembly (26) is located on two sides of the sample tube (9) in the axis direction of the sample tube (9), and the heating device (27) is installed on the bottom plate (21, the heating device (27) is positioned right below the connecting line of the two sampling head assemblies (26).

4. A multi-position autosampler device according to claim 3, characterized in that: the lifting driving component (22) and the clamping driving component (24) are in screw rod type transmission,

the lifting driving assembly (22) comprises a lifting motor (221), a lifting driving device (222), a lifting screw nut (223) and a lifting screw rod (224), the lifting motor (221) is installed on the bottom plate (21) or the support (3), two ends of the lifting screw rod (224) are supported through bearings and are vertically installed on the bottom plate (21) or the support (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 device (222);

the clamping driving assembly (24) comprises a clamping motor (241), a clamping transmission (242), a clamping lead screw nut (243) and a clamping lead screw (244), the clamping motor (241) is installed on the lifting seat plate (23), two ends of the clamping lead screw (244) are supported and installed on the lifting seat plate (23) through bearings, the axis of the clamping lead screw (244) is parallel to the axis of the sample tube (9), the clamping lead screw (244) is screwed with the two clamping lead screw nuts (243) with opposite rotation directions, the clamping lead screw nut (243) is fixedly connected with the two clamping plates (25) respectively, and the clamping motor (241) drives the clamping lead 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.

5. The multi-position automatic sample introduction device according to claim 4, wherein: the lifting motor (221) and the clamping motor (241) are motors with worm gear reducers.

6. The multi-position automatic sample introduction device according to claim 4, 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 a contact surface of the guide rod (245) and the clamping plate (25); the lifting screw rod nut (223), the lifting screw rod (224), the clamping screw rod nut (243) and the clamping screw rod (244) are all ball screw pairs.

7. A multi-position autosampler device according to claim 3, characterized in that: sample cell (9) include body (91) and set up the end cap at body (91) both ends, and the end cap adopts plug-in to break and connect the structure and seals: the end cap comprises an end cover (92), a rotary cover (93), a pin button (94) and a spring (95), the end cover (92) is sleeved at two ends of the pipe body (91), a sealing ring is arranged on the circumferential contact surface of the pipe body (91) and the end cover (92), a plurality of air passing holes (921) are formed in the end cover (92) close to the axial wall surface of the pipe body (91), one end, deviating from the pipe body (91), of the end cover (92) is a straight pipe, the straight pipe is internally provided with the pin button (94) and the spring (95) through the pin button (94) and the rotary cover (93) in a screwed mode, a stepped hole is formed in the rotary cover (93), the largest hole of the stepped hole is screwed with the end cover (92), the sealing ring is arranged at the screwed position of the rotary cover (93) and the end cover (92), a sampling hole (931) is outwards arranged at the bottom of the stepped hole, the pin button (94) comprises a pin rod, the round table deviates from the pipe body (91), the spring (95) is sleeved on the pin rod and is positioned between the round table and the end cover (92), a sealing ring is arranged between the bottom of a stepped hole in the screw cover (93) and the round table of the pin knob (94), the round table of the pin knob (94) is positioned in the stepped hole of the screw cover (93) in the reset state of the spring (95), and the sealing ring between the round table of the pin knob (94) and the end surface of the inner surface where the sampling hole (931) is positioned is compressed;

sampling head subassembly (26) are including sampling tube (261), sampling sealing washer (262) and conduit saddle (263), conduit saddle (263) are fixed on splint (25), sampling tube (261) includes column cap (2611), and sampling tube (261) inserts conduit saddle (263), column cap (2611) and faces sample tube (9), sets up on column cap (2611) and extends to the air guide hole (2612) at center from the surface, still overlaps on column cap (2611) to be equipped with sampling sealing washer (262), and column cap (2611) diameter is less than sampling hole (931) diameter.