CN114152703A

CN114152703A - Thermal desorption binary channels sample cell transfer system

Info

Publication number: CN114152703A
Application number: CN202010926034.9A
Authority: CN
Inventors: 何启发; 何洪志; 舒铜; 罗阳兴
Original assignee: Chengdu Colin Analysis Technology Co ltd
Current assignee: Chengdu Colin Analysis Technology Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2022-03-08

Abstract

The invention discloses a thermal desorption double-channel sample tube transmission system, which solves the problems of uncapping, capping, loading and transmission of a multi-channel sample tube. The manipulator rotates to enable the centre of the pipe clamp installed on the manipulator to rotate to the straight line of the connecting line of the rotation centre of the pipe clamp and the centre of the sample plate.

Description

Thermal desorption binary channels sample cell transfer system

Technical Field

The invention relates to the transfer of a substance to be detected through a thermal desorption sample tube filled with an adsorbent.

Background

The thermal desorption is also called thermal desorption and is important pretreatment equipment for detecting air quality, and volatile and semi-volatile organic compounds in air by using a gas chromatograph. Because the content of volatile and semi-volatile organic compounds in the air is very low, the sensitivity of a general gas chromatograph cannot meet the requirement, but people breathe at any time although the content is very low, the accumulated amount is very large, and the detection is necessary. Therefore, a sample tube filled with an adsorbent is needed to adsorb and concentrate a substance to be detected, and then sample injection is carried out through thermal desorption, but the sample tube has a large volume, the speed of directly desorbing a component to be detected is slow, the resolution of an obtained chromatographic peak is low, the requirement of the resolution of a capillary chromatographic column cannot be met, the component of the sample tube needs to be desorbed and then enters a low-temperature cold trap tube for focusing, desorption and sample injection, and the resolution of the chromatographic peak is obtained.

Because the quality of the inside filler of sample tube is very big to sampling and testing result influence, require to protect inside filler also to guarantee the testing result simultaneously when desorbing the sample tube, need at first sweep sample tube inside air and moisture, so the sample tube gets into the gas circuit connection at desorption passageway and both ends and is very important, generally has two kinds of modes on the market: a kind of time sample tube is inserted into the gas circuit interface of both ends, the exit end is heated to the whole sample introduction flow path, both ends adopt the O-ring seal, the carrier gas passes the exit end and backflows the sample tube, can clear away the intraductal air well, make the intraductal packing of sample not oxidized under the high temperature; the other method is that the two ends of the sample tube are sealed by rubber pads relatively simply, and the needles are inserted from the two ends to ventilate and sweep air, so that the air between the needles and the inner wall of the tube is difficult to sweep completely, the high temperature of the sample tube filler is directly damaged, the service life is shortened, and the cost is increased. Of course, there is a connection mode in which the two ends of the sample tube are provided with one-way valves, and this mode has the disadvantages of complicated inside of the one-way valve, difficulty in heating, large interference and high residue.

Disclosure of Invention

The invention aims to provide a thermal desorption double-channel sample tube transmission system with uncapping and capping functions and a transmission function.

The purpose of the invention is realized as follows:

a thermal desorption dual-channel sample tube transmission system is characterized in that at least one sample tube output interface 4-1 is arranged on one side of a sample plate 1 and is opposite to a lifting tube seat interface 6-7 coaxial with the sample tube output interface and the lifting tube seat interface, the sample tube output interface and the lifting tube seat interface are connected with an air path of the sample tube output interface, a horizontal in-and-out space of a sample tube heater 5-1 is arranged between the sample tube output interface and the lifting tube seat interface, the sample tube heater 5-1 is horizontally connected with a driver 5-2 in a transmission manner, a manipulator 3 rotation center 9 is arranged on the other side of the sample tube heater 5-1, a tube clamp 3-4 of the manipulator rotates anticlockwise for an angle and is vertically coaxial with a tube cap clamp of a cap removing and wearing cap rack 2, a tube taking position of the manipulator is set on an intersection point of a connecting line of two points of the manipulator rotation center 9 and the sample plate center 10 and the circumference where a sample tube on the sample plate is located, the manipulator 3 rotates to enable the center of the tube clamp 3-4 installed on the manipulator 3 to rotate to enable the rotation center 9 to be vertical coaxial with the sample plate 1 On a straight line connected with the center 10, the pipe clamps 3-4 are opened and closed to clamp the sample pipes 1-2 on the sample plate 1, the manipulator 3 rotates anticlockwise to a position between the upper fixing plate 2-2 and the lower fixing plate 2-3 of the uncapping and cap-wearing frame 2, the driving cylinder 2-7 is in transmission connection with the upper fixing plate 2-2 and the lower fixing plate 2-3, the distance between the upper fixing plate and the lower fixing plate is limited by two limiting rings 2-6 on the driving cylinder 2-7, the sample pipes 1-2 with the upper sealing caps 1-1 and the lower sealing caps 1-3 can enter the opened pipe cap clamps 2-8 on the upper fixing plate and the lower fixing plate, the pipe cap clamps 2-8 shrink to clamp the upper pipe caps and the lower pipe caps of the sample pipes 1-2, the upper fixing plate 2-2 and the lower fixing plate 2-3 of the uncapping and cap-wearing frame 2 are in transmission connection with the driving cylinder 2-7, the driving cylinder 2-7 extends vertically upwards and downwards, the upper fixing plate 2-2 and the lower fixing plate 2-3 slide to the upper limit ring 2-10 and the lower limit ring 2-11 along the sliding rod 2-1, the upper tube cap 1-1 and the lower tube cap 1-3 with elastic sealing rings slide along the sample tube 1, the sample tube 1-2 is separated from the sample tube to realize uncapping, the sample tube 1-2 rotates clockwise to the position of a sample tube output interface 4 after uncapping is finished, a driver 6-5 of a tube lifting seat interface is fixedly connected with a rail 6-4 and is in transmission connection with a tube lifting seat slider 6-3, the tube lifting seat interface is fixedly connected with the tube lifting seat slider 6-3, the tube lifting driver 6-1 is in transmission connection with the rail 6-4 through the rod 6-2, the tube lifting seat is driven to the middle position in the vertical direction to insert the sample tube into the tube lifting seat interface, the interfaces of the tube lifting seats are internally provided with respective sealing and retaining O-shaped rings, a tube clamp 3-4 of a manipulator 3 is opened, the manipulator retracts, a tube lifting driver 6-1 drives a sliding rod 6-2, a tube lifting seat sliding rail 6-4 and a tube lifting sliding block 6-3 to drive the interfaces 6-7 of the tube lifting seats to ascend, so that a sample tube is inserted into the output interface 4-1 of the sample tube, the output interface 4-1 of the sample tube is provided with an elastic sealing ring to seal the sample tube, and therefore the desorption pipeline connection including the sample tube is realized.

The sliding rod 2-1 is a left sliding rod 2-1-1 and a right sliding rod 2-1-2, the upper fixing plate 2-2 and the lower fixing plate 2-3 are respectively fixedly connected with a piston rod and a cylinder base of a driving cylinder 2-7, the left end and the right end of the upper fixing plate 2-2 and the lower fixing plate 2-3 are respectively provided with a sliding block which is respectively connected with the left sliding rod 2-1-1 and the right sliding rod 2-1-2, when a sample tube with a tube cap enters an upper uncapping tube clamp 2-8-1 and an upper uncapping tube clamp 2-8-2 of an uncapping frame and a lower uncapping tube clamp 2-8-6 and a lower uncapping tube clamp 2-8-7, the uncapping tube clamp contracts left and right to clamp the tube cap 1-1 and the tube cap 1-3, and then the uncapping clamp 2-8 fixed on the upper uncapping clamp fixing plate 2-2 and the lower uncapping clamp fixing plate 2-3 is respectively pulled upwards and downwards under the driving of the driving cylinder 2-7, the uncapping fixed plate 2-2 is fixed on a piston rod of a driving cylinder 2-7, the lower uncapping clamp fixed plate 2-3 is fixed on a cylinder seat of the cylinder 2-7, the fixed plates 2-2 and 2-3 are respectively fixed with a 1 st sliding block 2-12-1, a 2 nd sliding block 2-12-2, a 3 rd sliding block 2-12-3 and a 4 th sliding block 2-12-4 which slide along the left sliding rod 2-1-1 and the right sliding rod 2-1-2 of the uncapping frame, because the restraint rings 2-10 and 2-11 fixed on the sliding rod are arranged on the sliding rod, even if the pipe caps are not taken off at the same time due to inconsistent up-down force, the sliding block which reaches the restraint position at the other end stops moving, and the driving cylinder 2-7 is used for continuously extending to take off the other pipe cap. The distance between the two restraint rings 2-10 and 2-11 on the same slide bar is exactly the longest distance that the driving cylinder 2-7 extends out to drive the upper fixing plate 2-2 and the lower fixing plate 2-3 to drive the slide block to reach.

One side of the sample plate 1 is provided with a 1 st sample tube output interface 4-1, a 2 nd sample tube output interface 4-1, a 4-2 st sample tube output interface opposite to a 1 st tube lifting tube base interface 6-7 and a 2 nd tube lifting tube base interface 6-7 which are coaxial below the sample plate 1, the 1 st tube lifting tube base interface 6-6 and the 2 nd tube lifting tube base interface 6-7 are at the lowest positions, the 1 st tube lifting tube base interface, the 2 nd tube lifting tube base interface 6-6 and the 6-7 th tube lifting tube base interface are two loading interfaces which are integrated and are horizontally and axially arranged and are respectively connected with respective gas circuits, a sample tube heater is horizontally arranged between the 1 st sample tube output interface and the 1 st tube lifting tube base interface and the 2 nd tube lifting tube base interface which are coaxial below the sample tube output interface 1 and the 2 nd tube lifting tube base interface, a manipulator 3 rotation center 9 is arranged on a horizontal axis of the sample tube heater, the manipulator rotates 90 degrees anticlockwise, a tube clamp 3-4 of the manipulator is vertically coaxial with a 1 st tube clamp 2-8 th tube cap-8 or a 2 nd tube clamp 2-9, and a manipulator cap-9, and a manipulator taking position is set at a manipulator rotation center 9, On the intersection point of the connecting line of two points of the center 10 of the sample tray and the circumference of the sample tube on the sample tray, 2 sample tubes are loaded continuously from the foremost position set by the thermal desorption method, in the two sample tubes, the 1 st sample tube is firstly placed at the loading position of the extending position of the manipulator, when the command of loading the sample tubes is received, the manipulator 3 rotates to enable the center of a tube clamp 3-4 arranged on the manipulator 3 to rotate to the straight line of the connecting line of the rotating center 9 of the manipulator 3 and the center 10 of the sample tray 1, then the tube clamp 3-4 extends out and opens, the 1 st sample tube 11 clamped on the sample tray 1 is closed, the cylinder 3-1 of the manipulator retracts to the initial position, the manipulator 3 rotates anticlockwise to the connecting line of the rotating center 9 of the manipulator and the sample tube output interface 4, the cylinder 3-1 of the manipulator 3 extends out and continues to rotate to the upper part of the uncapping and capping rack 2, The distance between the upper fixing plate 2-2 and the lower fixing plate 2-3 driven by the driving cylinder 2-7 and the lower fixing plate 2-2 and the lower fixing plate 2-3 is limited by the limiting ring 2-6, the 1 st sample tube with the upper sealing cap 1-1 and the lower sealing cap 1-3 can enter the 1 st tube cap clamp 2-8 opened on the upper fixing plate and the lower fixing plate, the 1 st tube cap clamp 2-8 is positioned at the extending position of the manipulator, the 2 nd tube cap clamp 2-9 is positioned at the contracting position of the manipulator, the 1 st tube cap clamp 2-8 contracts to clamp the upper tube cap 1-1 and the lower tube cap 1-2 of the 1 st sample tube 1-2, the upper driving plate 2-2 and the lower driving plate 2-2 and 2-3 of the uncapping and hating rack 2 are in transmission connection with the driving cylinder 2-7, the driving cylinder 2-7 vertically extends, the upper driving plate 2-2 and the lower driving plate 2-2, 2-3 slides to the upper limit ring 2-10 and the lower limit ring 2-11 along the sliding rod 2-1, the upper and lower pipe caps 1-1, 1-3 with elastic sealing rings slide along the 1 st sample pipe 1-2, leave the 1 st sample pipe 1-2 to realize uncapping, when the 1 st sample pipe 1-2 finishes uncapping, the track rotates clockwise on the circular arc 7 of the extension pipe clamp 3-4 of the manipulator to the position of the sample pipe output interface 4, the driver 6-5 of the lifting pipe seat interface pushes the 1 st, 2 lifting pipe seat interfaces 6-6 and 6-7 to move to the position of the 2 lifting pipe seat interface 6-7 at the center of the circle 7, namely the position just extending out of the manipulator 3, and then the lifting pipe driver 6-1 drives the 1 st, 2 lifting pipe seats 6-7, 6-6 to the middle position in the vertical direction, the sample tube 1-2 is inserted into the 1 st tube lifting seat interface 6-7, each tube lifting seat interface is internally provided with a respective sealing and retaining O-shaped ring, at the moment, the sample tube heater 5 is opened without influencing the extension and retraction of the manipulator 3, then the tube clamp 3-4 of the manipulator 3 is opened, the manipulator retracts, the tube lifting seat is vertically driven to the initial position to prepare for loading the 2 nd sample tube, the tube lifting seat interface driver 6-5 retracts to the initial position, the 1 st and 2 nd tube lifting seat interfaces are fixed on a movable sliding block 6-3 of the tube lifting seat and can slide along a sliding block track 6-4, the manipulator 3 continuously rotates clockwise to the tube taking position of the sample plate to wait for the sample plate to rotate the 2 nd sample tube to the tube taking position, the tube clamp 3-4 of the manipulator 3 is opened, The manipulator extends out to a tube taking position, then the tube clamps 3-4 are closed to clamp the sample tubes, the manipulator 3 is retracted, the manipulator 3 rotates anticlockwise to a position where the cap is put on and taken off the cap frame, at the moment, the cap is put on and taken off the cap frame and returns to an initial position after the 1 st sample tube is taken off the cap, and the 2 nd tube clamp 2-9 of the hat-wearing and uncapping stand is in an open state, the 2 nd sample tube 1-2 with the sealing caps 1-1 and 1-3 is just positioned at the central position of the 2 nd tube clamp 2-9 of the hat-wearing and uncapping stand, then the 2 nd tube cap clamp 2-9 contracts to clamp the upper and lower sealing caps 1-1 and 1-3 of the 2 nd sample tube, then the cap-wearing and uncapping frame slides along the pair of slide bars 2-1, and the 2 nd cap-wearing pipe clamp 2-9 of the cap-wearing and uncapping frame is driven to vertically enable the upper sealing cap 1-1 and the lower sealing cap 1-3 to leave the 2 nd sample tube 1-2 to realize uncapping. Then the manipulator 3 rotates clockwise, the track 1-1 of the sample tube stops on the track circle 8 of the tube clamp 3-4 at the contraction position of the manipulator, the sample tube stops in the direction of the connecting line of the rotation center of the manipulator 3 and the sample tube output interface 4, then the sample tube 2 extends out, the sample tube 2 is right at the center of the 2 nd tube lifting seat interface 6-7, the tube lifting driver 6-1 drives the slide rod 6-2 to drive the whole tube lifting seat to ascend to the middle position, the sample tube 2 1-2 is inserted into the 2 nd tube lifting seat interface 6-7, then the tube clamp 3-4 of the manipulator 3 is opened and retracted to the initial position to wait for taking the tube, the sample tube 1 and the sample tube 2 are inserted into the tube lifting seat interfaces 1, 2, 6-6 and 6-7, at the time, the tube lifting driver 6-1 drives the slide rod 6-2 and the tube lifting seat slide rail 6-4, The tube lifting slide block 6-3 drives the 1 st and 2 nd tube lifting seat interfaces 6-6 and 6-7 to ascend, so that two sample tubes are inserted into the 1 st and 2 nd sample tube interfaces 4-2 and 4-1, the 1 st and 2 nd sample tube interfaces 4-2 and 4-1 have elastic sealing rings, the sample tubes are sealed, desorption pipeline connection including the sample tubes is achieved, tube loading during stacking is achieved, the process of capping the sample tubes is opposite to the process of uncapping, and the sample tubes are placed back to the original positions of the sample plates.

The invention has the following advantages:

to ensure the sample tube is in a closed state before analysis, to protect the sample tube packing and to ensure the quality of analysis, the best method is to place the sample tube with a sealing cap on the sample plate of the instrument, when the analysis is needed, the sample tube is automatically sampled by a mechanical arm and sent to a uncapping mechanism to be uncapped, then sent to a loading mechanism to be loaded, and then a series of sample processing processes of analysis are carried out. This has proven to be the best sample tube transfer connection for thermal desorption to date. Is the transfer process of one or two sample tubes.

The sample tube transfer system with uncapping and capping functions can provide quality assurance for subsequent sample processing. A single-channel thermal desorption process one sample at a time, and the whole detection system obtains one detection result. If a double-channel processing mode is adopted, the whole analysis efficiency can be improved by 50 percent, the cost is greatly reduced, and especially the analysis effect of the total volatile organic compounds with long analysis time is larger.

The invention realizes the transmission and loading of two sample tubes by using a set of single-channel sample tube transmission system with the functions of uncapping and capping, and the stack type tube loading with tube taking and capping can realize uncapping, loading and unloading capping of a plurality of sample tubes according to the method.

The invention adopts the butt joint of the movable tube seat and the manipulator, reduces the requirement on complex hardware and provides convenience for realizing automation and intellectualization.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a right side view of fig. 1.

Fig. 4 is a view a-a of fig. 2.

Fig. 5 is a bottom view and a-a view of the cap clip 2-8.

FIG. 6 is a view showing the arrangement of the gas claw.

Fig. 7 is a cross-sectional view of fig. 7 taken along line C-C of fig. 2.

Detailed Description

The sample disc is a disc provided with a plurality of clamps with clamping functions and is driven by a motor and the position of the sample disc is controlled by a controller;

the manipulator is a device which is controlled by a controller to rotate, can stretch and retract, and is provided with a pipe clamp at one end of the manipulator;

the uncapping stand mainly comprises two vertical slide rods, a driver which can lead the uncapping plate which is fixed and uncapped up and down to move up and down, and a limiting stopper

The tube lifting seat can move up and down and stay at an intermediate state, and can also move at the position of a connector of the outlets of the two connecting tubes along the telescopic direction of the mechanical arm;

the structure of the double-sample-tube heater is disclosed in patent No. ZL 201310023569.5, and the structure of the thermal desorption first-stage sample-tube heater.

A thermal desorption double-channel sample tube transfer system is characterized in that a sample tube loading output interface 4 is arranged on one side of a sample disc 1 and is opposite to lifting tube seat interfaces 6-6 and 6-7 below the sample disc, a sample tube heater is arranged between the sample tube loading output interface and the lifting tube seat interfaces, one horizontal axial side of the sample tube heater is opposite to a manipulator 3 which is not arranged on a horizontal plane, the manipulator is opposite to a cap-removing and cap-wearing frame 2 after rotating by an angle of 90 degrees,

the tube taking position of the manipulator is set on the straight line of two-point connecting line of the rotation center 9 of the manipulator and the center 10 of the sample plate, and after the manipulator extends out, the tube clamp center rotates to the tangent point of the circumference of the sample tube on the sample plate around the rotation center of the manipulator,

loading of sample tubes 2 sample tubes were loaded consecutively starting from the foremost position set by the thermal desorption method, of which the first tube was first placed in the loading position of the manipulator's extended position, the corresponding uncapping position being also distal,

FIG. 5 is a bottom view of the tube cap clamp 2-8 and an A-A view of the two tube cap clamps of FIG. 3. the pneumatic gripper cylinder 2-8-3 is a commercial pneumatic gripper cylinder and the two tube cap clamps 2-8-1 and 2-8-2 are attached to the pneumatic grippers 2-8-4 and 2-8-5, respectively, and the pneumatic gripper cylinder 2-8-3 is capable of driving the pneumatic grippers 2-8-4 and 2-8-5 to drive the tube cap clamps 2-8-1 and 2-8-2 to open and close left and right, shown in a contracted closed state. As shown in A-A, the tube cap clamps 2-8-1 and 2-8-2 have two arc surfaces, the diameter of the arc surface on the upper surface is the same as that of the cylindrical surface of the tube cap, the diameter of the arc surface on the lower surface is smaller than that of the cylindrical surface of the tube cap, before a sample tube with the tube cap enters the decapping frame 2, the air claw cylinder 2-8-3 drives the air claws 2-8-4 and 2-8-5 to be opened left and right, and after the sample tube with the tube cap enters the decapping frame 2 (shown in figure 6), the air claw cylinder 2-8-3 drives the air claws 2-8-4 and 2-8-5 to be contracted left and right to drive the tube cap clamps 2-8-1 and 2-8-2 to close and clamp the tube cap.

The sample tube uncapping rack works as follows: FIG. 7 is a cross-sectional view taken along line C-C of FIG. 2

When a sample tube with a tube cap enters an upper uncapping tube clamp 2-8-1 and 2-8-2 and a lower uncapping tube clamp 2-8-6 and 2-8-7 of an uncapping frame, the uncapping tube clamp contracts left and right to clamp the tube cap 1-1 and 1-3, then the uncapping clamp is fixed on an upper uncapping clamp fixing plate 2-2 and an uncapping clamp fixing plate 2-3 and is respectively pulled upwards and downwards under the driving of the extension of a driving cylinder 2-7, the uncapping fixing plate 2-2 is fixed on a piston rod of the driving cylinder 2-7, the lower uncapping clamp fixing plate 2-3 is fixed on a cylinder seat of the cylinder 2-7, and two sliding blocks 2-12-1 and 2-12-2 which slide on an uncapping sliding rod 2-1-1 and 2-1-2 are respectively fixed on the fixing plates 2-2 and 2-3, 2-12-3 and 2-12-4, because the slide bar is provided with the restraint rings 2-10 and 2-11 fixed on the slide bar, even if the pipe caps are not taken off at the same time due to inconsistent up and down force, the slide block which reaches the restraint position at the other end stops moving, and the air cylinder 2-7 which is taken as a fulcrum continues to extend out to take off the other pipe cap. The distance between the two restraint rings 2-10 and 2-11 on the same slide bar is exactly the longest distance that the cylinder 2-7 extends out to drive the uncapping fixed plates 2-2 and 2-3 so as to drive the slide block to reach.

The process of putting on the cap is opposite.

When receiving a tube loading command, the manipulator 3 rotates to enable the center of a tube clamp 3-4 arranged on the manipulator 3 to rotate to a straight line of a connecting line of a rotating center 9 of the tube clamp and a center 10 of a sample plate 1, then the tube clamp 3-4 extends out and is opened, then a sample tube 11 clamped on the sample plate 1 is closed, a cylinder 3-1 of the manipulator retracts to an initial position, the manipulator 3 rotates anticlockwise to a connecting line of the rotating center 9 of the manipulator and a sample tube loading output interface 4, the cylinder 3-1 of the manipulator 3 extends out, then the manipulator continues to rotate to a position between an upper fixing plate 2-2 and a lower fixing plate 2-3 of a cap removing and wearing frame 2, the distance between the upper fixing plate 2-2 and the lower fixing plate 2-3 driven by a driving cylinder 2-7 is limited by a limiting ring 2-6, and the sample tube just provided with sealing caps 1-1 and 1-3 can enter an opened 1 st fixing plate on the upper fixing plate and the lower fixing plate, 2, in the tube cap clamps 2-8 and 2-9, the 1 st tube cap clamp 2-8 is positioned at the extending position of a manipulator, the 2 nd tube cap clamp 2-9 is positioned at the retracting position of the manipulator, then the 1 st tube cap clamp 2-8 is retracted to clamp the tube cap 1-1 of the 1 st sample tube 1-2, at this time, the 1 st sample tube with the sealed tube cap 1-1 is positioned at the far end position where the manipulator extends, the upper and lower driving plates 2-2 and 2-3 of the uncapping and cap wearing frame 2 in the vertical direction are extended by the driving cylinder 2-7 to drive the upper and lower driving plates 2-1 to slide to the upper limit ring 2-10 and the lower limit ring 2-11 along the rod 2-1, and because of the up and down constraint limit, the upper and lower tube caps 1-1 and 1-3 with the elastic sealing rings slide along the 1 st sample tube 1-2 and leave the 1 st sample tube 1-2 to realize uncapping, at the moment, the 1 st sample tube 1-2 is clamped on the mechanical tube clamp 3-4 and is kept immovable in the vertical direction, the 1 st and 2 nd tube lifting seat interfaces 6-6 and 6-7 are at the lowest positions, the 1 st and 2 nd tube lifting seat interfaces 6-6 and 6-7 are two loading interfaces which are integrated and horizontally and axially arranged and are respectively connected with respective gas circuits, when the 1 st sample tube 1-2 finishes uncapping, the sample tube rotates clockwise along the track on an arc 7 of the mechanical arm extending out of the tube clamp 3-4 to the position of a loading position-sample tube output interface 4, then a driver 6-5 of the tube lifting seat interfaces pushes the 1 st and 2 nd tube lifting seat interfaces 6-6 and 6-7 to move to the position of the 2 nd tube lifting seat interface 6-7 at the center of the circle 7, namely the position just extending out of the mechanical arm 3, then the tube lifting cylinder 6-1 drives the 1 st and 2 nd tube lifting seats 6-6 and 6-7 to the middle position in the vertical direction to insert the sample tubes 1-2 into the 1 st tube lifting seat interface 6-6, each tube lifting seat interface is internally provided with a respective sealing and maintaining O-shaped ring, the sample tube heater 5 is opened at the moment and does not influence the extension and retraction of the manipulator 3, then the tube clamps 3-4 of the manipulator 3 are opened, the manipulator retracts, the tube lifting seats are vertically driven to the initial position to prepare for the loading of the 2 nd sample tubes, the tube lifting seat interface driver 6-5 retracts to the initial position, the 1 st and 2 nd tube lifting seat interfaces are fixed on the moving slide block 6-3 of the tube lifting seats and can slide along the slide block track 6-4,

then the manipulator 3 continues to rotate clockwise to the direction of the tube taking position of the sample tray to wait for the sample tray to rotate the 2 nd sample tube to the tube taking position, the tube clamp 3-4 of the manipulator 3 is opened, the manipulator extends to the tube taking position, then the tube clamp 3-4 is closed to clamp the sample tube, the manipulator 3 is retracted, the manipulator 3 rotates anticlockwise to the position of the cap wearing and uncapping rack, at the moment, the cap wearing and uncapping rack returns to the initial position after the 1 st sample tube is uncapped, the 2 nd tube cap clamp 2-9 of the cap wearing and uncapping rack is in an open state, the 2 nd sample tube 1-2 with the sealing caps 1-1 and 1-3 is just at the central position of the 2 nd tube clamp 2-9 of the cap wearing and uncapping rack, then the 2 nd tube cap clamp 2-9 contracts to clamp the upper and lower sealing caps 1-1 and 1-3 of the 2 nd sample tube, then the cap-wearing and uncapping frame slides along the pair of slide bars 2-1, and the 2 nd cap-wearing pipe clamp 2-9 of the cap-wearing and uncapping frame is driven to vertically enable the upper sealing cap 1-1 and the lower sealing cap 1-3 to leave the 2 nd sample tube 1-2 to realize uncapping. Then the manipulator 3 rotates clockwise, the track of the sample tube 1-1 is stopped on a track circle 8 of a tube clamp 3-4 at the contraction position of the manipulator in the direction of a connecting line of the rotation center of the manipulator 3 and the sample tube output interface 4, then the sample tube 2 is stretched out, the sample tube 2 is right at the center of a tube lifting seat interface 6-7, a tube lifting driver 6-1 drives a sliding rod 6-2 to drive the whole tube lifting seat to ascend to the middle position, the sample tube 2 1-2 is inserted into the tube lifting seat interface 6-7, and then the tube clamp 3-4 of the manipulator 3 is opened and retracted to the initial position to wait for taking the tube.

At present, the 1 st and 2 nd sample tubes are inserted into the 1 st and 2 nd lifting tube seat interfaces 6-6 and 6-7, at the moment, the lifting tube driver 6-1 drives the sliding rod 6-2, the lifting tube seat sliding rail 6-4 and the lifting tube sliding block 6-3 to drive the 1 st and 2 nd lifting tube seat interfaces 6-6 and 6-7 to ascend, so that the two sample tubes are inserted into the 1 st and 2 nd sample tube interfaces 4-2 and 4-1, the 1 st and 2 nd sample tube interfaces 4-2 and 4-1 are provided with elastic sealing rings, the sample tubes are sealed, the desorption pipeline connection including the sample tubes is realized, and the tube loading during stacking is realized.

Also affecting the transfer of sample tubes there are tube heaters, the presence of which does not allow the robot to rotate directly in the horizontal direction when loading or removing sample tubes, so that the tube lifting seats must be movable out of the way.

The process of taking the tube and putting the cap is the reverse process of the tube loading method, and the sample tube is put back to the original position of the sample plate.

Claims

1. A thermal desorption double-channel sample tube transfer system is characterized in that at least one sample tube output interface (4-1) is arranged on one side of a sample disc (1) and is opposite to a lifting tube seat interface (6-7) coaxial below the sample tube output interface, the lifting tube seat interface is connected with a gas circuit of the sample tube output interface, a horizontal in-and-out space of a sample tube heater (5-1) is arranged between the sample tube output interface and the lifting tube seat interface, the sample tube heater (5-1) is in transmission connection with a driver (5-2), a manipulator (3) rotation center (9) is arranged on one side of the sample tube heater, a tube clamp (3-4) of the manipulator rotates by an angle and is vertically coaxial with a tube cap clamp of a cap removing and wearing frame (2), and a tube taking position of the manipulator is set on an intersection point of a connecting line of two points of the manipulator rotation center (9) and a sample disc center (10) and the circumference of a sample tube on the sample disc, the manipulator rotates to enable the center of a pipe clamp arranged on the manipulator to rotate to the straight line of the connecting line of the rotating center of the pipe clamp and the center (10) of a sample plate, the pipe clamp (3-4) extends out and opens, the sample pipe (1-2) clamped on the sample plate is closed and then contracts, the manipulator rotates anticlockwise to the position between an upper fixing plate (2-2) and a lower fixing plate (2-3) of a uncapping and cap-wearing frame (2), a driving cylinder (2-7) is in transmission connection with the upper fixing plate and the lower fixing plate, the distance between the upper fixing plate and the lower fixing plate is limited by two limiting rings (2-6) on the driving cylinder, the sample pipe (1-2) with an upper sealing cap (1) and a lower sealing cap (1-3) can enter an opened pipe cap clamp (2-8) on the upper fixing plate and the lower fixing plate, the pipe cap clamp contracts to clamp the upper pipe cap and the lower pipe cap of the sample pipe, the upper fixing plate and the lower fixing plate of the uncapping hat-wearing rack are in transmission connection with a driving cylinder, the driving cylinder extends upwards and downwards in the vertical direction, the upper fixing plate and the lower fixing plate slide to the positions of an upper limiting ring (2-10) and a lower limiting ring (2-11) along a sliding rod (2-1), the upper pipe hat and the lower pipe hat with elastic sealing rings slide along the sample tube, the sample tube leaves the sample tube to be uncapped, the sample tube rotates clockwise to the position of a sample tube output interface (4) after uncapping is completed, a driver (6-5) of a tube lifting seat interface is fixedly connected with a rail (6-4) and is in transmission connection with a tube lifting seat sliding block (6-3), the tube lifting seat interface is fixedly connected with the tube lifting seat sliding block, a tube lifting driver (6-1) is in transmission connection with the rail (6-4) through the sliding rod (6-2), and drives the tube lifting seat to the middle position in the vertical direction to enable the sample tube to be inserted into the tube lifting seat interface, the lifting pipe seat interface is internally provided with respective sealing and maintaining O-shaped rings, a pipe clamp (3-4) of the manipulator is opened, the manipulator retracts, a lifting pipe driver (6-1) drives a sliding rod (6-2), a lifting pipe seat sliding rail (6-4) and a lifting pipe sliding block (6-3) to drive the lifting pipe seat interface (6-7) to ascend, so that the sample pipe is inserted into the sample pipe output interface (4-1), and the sample pipe output interface is provided with an elastic sealing ring.

2. The thermal desorption dual-channel sample tube transfer system according to claim 1 or 2, wherein the sliding rods (2-1) are left and right sliding rods (2-1-1), (2-1-2), the upper and lower fixing plates are respectively fixedly connected with the piston rod and the cylinder base of the driving cylinder (2-7), the left and right ends of the upper and lower fixing plates are respectively connected with the left and right sliding rods by sliding blocks, when the sample tube with the tube cap enters the 1 st and 2 nd upper uncapping tube clamps (2-8-1), (2-8-2), the 1 st and 2 nd lower uncapping tube clamps (2-8-6), (2-8-7) of the uncapping frame, the uncapping tube clamps shrink left and right to clamp the upper and lower tube caps (1-1), (1-3), and then the uncapping clamps (2-8) fixed on the upper fixing plate and the lower fixing plate respectively move up and down under the driving of the driving cylinder Pulling, wherein the upper fixing plate 2 is fixed on a piston rod of the driving cylinder, the lower fixing plate is fixed on a cylinder seat of the cylinder, two 1 st sliding blocks (2-12-1), 2 nd sliding blocks (2-12-2), 3 rd sliding blocks (2-12-3) and 4 th sliding blocks (2-12-4) which slide along the left sliding rod (2-1-1) and the right sliding rod (2-1-2) are respectively fixed at two ends of the upper fixing plate and the lower fixing plate 2, and because the constraint rings 2-10 and 2-11 fixed on the sliding rods are arranged on the sliding rods, even if the pipe caps are not taken off simultaneously due to inconsistent upper and lower forces, the sliding blocks which reach the constraint positions first at the other ends stop moving, so that the driving cylinder continues to extend to take off another pipe cap, and the distance between the two constraint rings on the same sliding rod is just the distance between the driving cylinder and the driving cylinder after the driving cylinder extends to drive the upper fixing plate, The lower fixing plate drives the slide block to reach the longest distance.

3. The thermal desorption dual-channel sample tube transfer system according to claim 1 or 2, wherein the 1 st and 2 nd sample tube output interfaces (4-1) and (4-2) are arranged on one side of the sample tray (1) and are opposite to the 1 st and 2 nd tube lifting seat interfaces (6-7) and (6-6) which are coaxial below the sample tray, the 1 st and 2 nd tube lifting seat interfaces are at the lowest positions, the 1 st and 2 nd tube lifting seat interfaces are two integrated loading interfaces which are arranged horizontally and axially and are respectively connected with respective gas circuits, a sample tube heater is arranged between the 1 st and 2 nd sample tube output interfaces and the 1 st and 2 nd tube lifting seat interfaces which are coaxial below the 1 st and 2 nd sample tube lifting seat interfaces horizontally and in-out space, the sample tube heater is provided with a rotation center (9) of a manipulator in the horizontal direction, and after the manipulator rotates counterclockwise by an angle of 90 degrees, a tube clamp (3-4) of the manipulator is vertically coaxial with the 1 st tube clamp (2-8) or the 2 nd tube clamp (2-9) of the uncapping rack, the tube taking position of the manipulator is set on the intersection point of the connecting line of the rotation center of the manipulator and two points of the center of the sample tray and the circumference of the sample tube on the sample tray, the loading of the sample tube is started from the foremost position set by the thermal desorption method, 2 sample tubes are continuously loaded, in the two sample tubes, the No. 1 sample tube is firstly placed at the loading position of the extension position of the manipulator, when the command of loading the sample tube is received, the manipulator rotates to enable the tube clamp center arranged on the manipulator to rotate to the straight line of the connecting line of the rotation center of the manipulator and the center of the sample tray 1, then the tube clamp extends out and is opened, the No. 1 sample tube clamped on the sample tray 1 is closed, the cylinder (3-1) of the manipulator retracts to the initial position, when the manipulator rotates anticlockwise to the connecting line of the rotation center of the manipulator and the output interface of the sample tubes, the cylinder of the manipulator extends out and continues to rotate to the uncapping and capping rack, The distance between the upper fixing plate and the lower fixing plate driven by a driving cylinder (2-7) is limited by a limiting ring (2-6), a 1 st sample tube with an upper sealing cap (1-1) and a lower sealing cap (1-3) can enter an opened 1 st tube cap clamp (2-8) on the upper fixing plate and the lower fixing plate, the 1 st tube cap clamp is positioned at the extending position of a manipulator, a 2 nd tube cap clamp (2-9) is positioned at the contracting position of the manipulator, the 1 st tube cap clamp contracts to clamp the upper tube cap (1-1) and the lower tube cap (1-3) of the 1 st sample tube (1-2), the upper fixing plate and the lower fixing plate of the uncapping cap wearing frame are in transmission connection with the driving cylinder, the driving cylinder vertically extends out, the upper fixing plate and the lower fixing plate slide to the positions of the upper limiting ring (2-10) and the lower limiting ring (2-11) along the 1 st sliding rod and the 2-2 sliding rod, the upper and lower pipe caps (1-1), (1-3) with elastic sealing rings slide along the 1 st sample pipe and leave the 1 st sample pipe to realize uncapping, when the 1 st sample pipe finishes uncapping, the pipe caps rotate clockwise, the track of the pipe caps is on an arc (7) of a pipe clamp (3-4) extending out of a manipulator, and reaches the position of a sample pipe output interface (4), a driver (6-5) of a pipe lifting seat interface pushes the 1 st and 2 nd pipe lifting seat interfaces (6-6) and (6-7) to move to the position of the 2 nd pipe lifting seat interface center on the arc, namely the position just extending out of the manipulator, then the pipe lifting driver (6-1) drives the 1 st and 2 th pipe lifting seats to the middle position in the vertical direction to insert the 1 st sample pipe into the 1 st pipe lifting seat interface, and each pipe lifting seat interface is internally provided with a respective sealing and maintaining O-shaped ring, at the moment, a sample tube heater (5) is opened, the expansion and contraction of a manipulator are not influenced, then a tube clamp of the manipulator is opened, the manipulator retracts, a tube lifting seat is vertically driven to return to an initial position to prepare for loading a 2 nd sample tube, a tube lifting seat interface driver retracts to the initial position, a 1 st tube lifting seat interface and a 2 nd tube lifting seat interface are fixed on a movable sliding block (6-3) of the tube lifting seat and can slide along a sliding block track (6-4), the manipulator continues to rotate clockwise to a tube taking position of a sample disc to wait for the sample disc to rotate the 2 nd sample tube to the tube taking position, a tube clamp of the manipulator is opened, the manipulator extends to the tube taking position, then the tube clamp is closed to clamp the 2 nd sample tube, the manipulator retracts, the manipulator rotates anticlockwise to a cap wearing and taking-off rack position, at the moment, the cap wearing and taking-off rack returns to the initial position after the 1 st sample tube is taken off the cap, and a 2 nd tube cap clamp (2-9) of the cap wearing and taking-off rack is in an open state, the 2 nd sample tube with upper and lower sealing caps (1-1), (1-3) is right at the center position of the 2 nd tube cap clamp (2-9) of the cap wearing and uncapping frame, then the 2 nd tube cap clamp (2-9) is contracted to clamp the upper and lower sealing caps of the 2 nd sample tube, then the cap wearing and uncapping frame slides along a pair of sliding rods to drive the 2 nd tube cap wearing and uncapping frame to clamp the upper and lower sealing caps in the vertical direction to separate the 2 nd sample tube for uncapping, then the manipulator rotates clockwise, the track of the sample tube stops on a track circle (8) of a tube clamp (3-4) at the manipulator contraction position to the direction of a connecting line between the manipulator rotation center and a sample tube output interface, then the sample tube extends out, at the moment, the 2 nd sample tube is right at the center of the 2 nd tube lifting interface, a tube lifting driver (6-1) drives the sliding rod (6-2) to drive the whole tube lifting seat to ascend to the middle position, the 2 nd sample tube is inserted into the 2 nd lifting tube seat interface (6-7), then the tube clamp of the manipulator is opened and retracted to the initial position to wait for taking the tube, the 1 st and 2 nd sample tubes are inserted into the 1 st and 2 nd lifting tube seat interfaces (6-6) and (6-7), at the moment, the lifting tube driver drives the slide bar, the lifting tube seat slide rail (6-4) and the lifting tube slide block (6-3) drive the 1 st and 2 nd lifting tube seat interfaces to ascend, so that the two sample tubes are inserted into the 1 st and 2 nd sample tube seats, the 1 st and 2 nd sample tube interfaces are provided with elastic sealing rings to realize the sealing of the sample tubes, thereby realizing the desorption pipeline connection including the sample tubes, realizing tube loading during stacking, the process of putting on the sample tubes is opposite to the process of taking off the caps, and putting the sample tubes back to the original positions of the sample trays.