Thermal desorption dual-channel sample tube transfer system

Abstract

The present invention is a thermal desorption dual-channel sample tube transfer system, which solves the problems of decapping, capping, loading and transfer of multi-channel sample tubes. At least one sample tube output interface is provided on one side of the sample tray, which is opposite to the coaxial tube lifting seat interface below it, and the tube lifting seat interface is connected to its gas path. There is a horizontal inlet and outlet space of the sample tube heater between the sample tube output interface and the tube lifting seat interface, and the sample tube heater is horizontally connected to the driver. A manipulator rotation center is provided on one side of the sample tube heater. After the manipulator rotates 90 degrees counterclockwise, its tube clamp is vertically coaxial with the tube cap clamp of the decapping and capping rack. The manipulator tube taking position is set at the intersection of the line connecting the manipulator rotation center and the sample tray center and the circumference of the sample tube on the sample tray. The manipulator rotates so that the center of the tube clamp installed on the manipulator rotates to the straight line connecting its rotation center and the center of the sample tray.

Description

Technical Field

[0001] The present invention relates to the transfer of a thermal desorption sample tube filled with an adsorbent through which a substance to be detected will pass. Background Art

[0002] The thermal desorption mentioned here, also called thermal desorption, is an important pretreatment device for gas chromatographs for detecting air quality and volatile and semi-volatile organic compounds in the air. Since the content of volatile and semi-volatile organic compounds in the air is very low, the sensitivity of general gas chromatographs cannot meet the requirements. However, although the content is very low, people are breathing it all the time, and its cumulative amount is very large, so there is a need for detection. Therefore, it is necessary to adsorb and concentrate the substance to be detected through a sample tube filled with an adsorbent and then desorb and inject the sample through thermal desorption. However, the sample tube is relatively large in volume, the speed of directly desorbing the components to be detected is slow, and the resolution of the obtained chromatographic peak is relatively low, which cannot meet the requirements of the capillary chromatographic column resolution. It is necessary to desorb the sample tube components and then enter a cryogenic cold trap tube for focusing and then desorb and inject the sample to obtain a high chromatographic peak resolution.

[0003] Since the quality of the internal packing of the sample tube has a great influence on the sampling and detection results, it is required to protect the internal packing well during the desorption of the sample tube and at the same time ensure the detection results. It is necessary to first purge the air and moisture inside the sample tube. Therefore, the connection of the sample tube to the gas path at both ends when entering the desorption channel is very important. Generally, there are two main methods on the market: One is to insert the sample tube into the gas path interfaces at both ends, and the outlet end to the entire injection flow path is heated. O-rings are used for sealing at both ends, and the carrier gas blows back the sample tube through the outlet end, which can well remove the air inside the tube and prevent the internal packing of the sample tube from being oxidized at high temperatures; the other is a relatively simple method of sealing both ends of the sample tube with rubber gaskets and inserting needles from both ends to purge the air. A big problem is that it is very difficult to completely purge the air between the needles and the inner wall of the tube, which directly leads to the high-temperature damage of the sample tube packing, shortened service life, and increased cost. Of course, there is also a connection method with check valves at both ends of the sample tube. The disadvantage of this method is that the inside of the check valve is complex, not easy to be heated, has a large interference, and a high residue. Summary of the Invention

[0004] The object of the present invention is to provide a thermal desorption dual-channel sample tube transfer system with a decapping and capping function and a transfer function.

[0005] The object of the present invention is achieved as follows:

[0006] The thermal desorption dual-channel sample tube transfer system has at least one sample tube output interface 4-1 on one side of the sample tray 1, which is opposite to the coaxial tube lifting seat interface 6-7 below it. The sample tube output interface and the tube lifting seat interface are connected to their gas path. There is a horizontal entry and exit space for a sample tube heater 5-1 between the sample tube output interface and the tube lifting seat interface. The sample tube heater 5-1 is horizontally driven and connected to a driver 5-2. The other side of the sample tube heater 5-1 has a rotation center 9 of a manipulator 3. After the manipulator rotates counterclockwise at an angle, its tube clamp 3-4 is vertically coaxial with the tube cap clamp of the capping and removing stand 2. The manipulator tube taking position is set at a point where the line connecting the manipulator rotation center 9 and the sample tray center 10 is parallel to the sample. At the intersection of the circumference of the sample tube on the disk, the manipulator 3 rotates to rotate the center of the tube clamp 3-4 installed on the manipulator 3 to the straight line connecting its rotation center 9 and the center 10 of the sample disk 1, and the tube clamp 3-4 opens and closes the sample tube 1-2 clamped on the sample disk 1. The manipulator 3 rotates counterclockwise to between the upper and lower fixed plates 2-2 and 2-3 of the capping and capping rack 2, and the driving cylinder 2-7 is connected to the upper and lower fixed plates 2-2 and 2-3. The distance between the upper and lower fixed plates is limited by the two limiting rings 2-6 on the driving cylinder 2-7. The sample tube 1-2 with the upper and lower sealing caps 1-1 and 1-3 can enter the opened tube cap clamp 2- 8, the first tube cap clamp 2-8 contracts and clamps the upper and lower tube caps of the sample tube 1-2, the upper and lower fixed plates 2-2 and 2-3 of the capping and capping rack 2 are transmission connected with the driving cylinder 2-7, the driving cylinder 2-7 extends vertically upward and downward, the upper and lower fixed plates 2-2 and 2-3 slide along the sliding rod 2-1 to the upper limit ring 2-10 and the lower limit ring 2-11 position, the upper and lower tube caps 1-1 and 1-3 with elastic sealing rings slide along the sample tube 1, leave the sample tube 1-2 to realize the capping, the sample tube 1-2 is rotated clockwise to the position of the sample tube output interface 4 after the capping is completed, the driver 6-5 of the tube lifting seat interface is fixedly connected with the track 6-4, and the tube lifting seat slider 6-3 is transmission connected. The lifting seat interface is connected dynamically, and the lifting seat slide block 6-3 is fixedly connected. The lifting seat driver 6-1 is connected to the track 6-4 through the rod 6-2, and drives the lifting seat to the middle position in the vertical direction so that the sample tube is inserted into the lifting seat interface. The lifting seat interface has its own sealing O-ring. The tube clamp 3-4 of the manipulator 3 is opened and the manipulator is retracted. The lifting seat driver 6-1 drives the slide bar 6-2, the track 6-4, and the lifting seat slide block 6-3 to drive the lifting seat interface 6-7 to rise, so that the sample tube is inserted into the sample tube output interface 4-1. The sample tube output interface 4-1 has an elastic sealing ring to achieve sealing of the sample tube, thereby realizing the connection of the desorption pipeline including the sample tube.

[0007] The sliding rod 2-1 consists of left and right sliding rods 2-1-1 and 2-1-2. The upper and lower fixing plates 2-2 and 2-3 are respectively fixedly connected to the piston rod and the cylinder block of the driving cylinder 2-7. There are sliders at the left and right ends of the upper and lower fixing plates 2-2 and 2-3, which are slidably connected to the left and right sliding rods 2-1-1 and 2-1-2 respectively. After the sample tube with a tube cap enters the upper de-capping tube clamps 2-8-1 and 2-8-2 and the lower de-capping tube clamps 2-8-6 and 2-8-7 of the de-capping rack, the de-capping tube clamps contract left and right to clamp the upper and lower sealing caps 1-1 and 1-3. Then, the first de-capping clamps 2-8 fixed on the upper de-capping clamp fixing plate 2-2 and the lower de-capping clamp fixing plate 2-3 are respectively pulled upward and downward under the extension drive of the driving cylinder 2-7. Here, the de-capping fixing plate 2-2 is fixed on the piston rod of the driving cylinder 2-7, and the lower de-capping clamp fixing plate 2-3 is fixed on the cylinder block of the cylinder 2-7. Two first and second sliders 2-12-1 and the second slider 2-12-2, the third slider 2-12-3 and the fourth slider 2-12-4 that slide along the left sliding rod 2-1-1 and the right sliding rod 2-1-2 of the de-capping rack are respectively fixed on the fixing plates 2-2 and 2-3. Since there are restraint rings 2-10 and 2-11 fixed on the sliding rods, even if the up and down forces are inconsistent and the tube caps are not pulled out simultaneously, the slider that reaches the restraint position first at the other end will stop moving, so that the driving cylinder 2-7 can continue to extend to pull off the other tube cap. The distance between the two restraint rings 2-10 and 2-11 on the same sliding rod is exactly the maximum distance that the driving cylinder 2-7 extends to drive the upper fixing plate 2-2 and the lower fixing plate 2-3 and thus drive the sliders to reach.

[0008] On one side of the sample tray 1, the first and second sample tube output interfaces 4-1 and 4-2 are opposite to the first and second tube lifting seat interfaces 6-7 and 6-6 coaxial with them below. The first and second tube lifting seat interfaces 6-6 and 6-7 are in the lowest position. The first and second tube lifting seat interfaces 6-6 and 6-7 are two loading interfaces arranged horizontally and axially as a whole, and are respectively connected to their respective gas paths. There is a horizontal access space for the sample tube heater between the first and second sample tube output interfaces and the first and second tube lifting seat interfaces coaxial with them below. There is a rotation center 9 of the manipulator on the horizontal axis of the sample tube heater. After the manipulator rotates counterclockwise by 90 degrees, its tube clamp 3-4 is vertically coaxial with the first tube cap clamp 2-8 or the second tube cap clamp 2-9 of the de-capping and capping rack 2. The tube picking position of the manipulator is set at the intersection of the line connecting the rotation center 9 of the manipulator and the sample tray center 10 and the circumference where the sample tubes on the sample tray are located.

[0009] The loading of the sample tube starts from the front position set by the thermal desorption method, and two sample tubes are loaded continuously. Among the two sample tubes, the first sample tube is first placed in the loading position of the robot's extended position. When the loading tube command is received, the robot 3 rotates so that the center of the tube clamp 3-4 installed on the robot 3 rotates to the straight line connecting its rotation center 9 and the center 10 of the sample tray 1, and then the tube clamp 3-4 is extended and opened, and the first sample tube 11 clamped on the sample tray 1 is closed. The cylinder 3-1 of the robot shrinks to the initial position. When the robot 3 rotates counterclockwise to the line connecting the robot's rotation center 9 and the sample tube output interface 4, the cylinder 3-1 of the robot 3 extends and continues to rotate between the upper and lower fixed plates 2-2 and 2-3 of the capping and capping rack 2, and the driving cylinder The distance between the upper and lower fixed plates 2-2 and 2-3 driven by 2-7 is limited by the limit ring 2-6, and the first sample tube with the upper and lower sealing caps 1-1 and 1-3 can enter the opened first tube cap clamp 2-8 on the upper and lower fixed plates. The first tube cap clamp 2-8 is located at the extended position of the manipulator, and the second tube cap clamp 2-9 is located at the retracted position of the manipulator. The first tube cap clamp 2-8 retracts and clamps the upper and lower tube caps 1-1 of the first sample tube 1-2. The upper and lower driving plates 2-2 and 2-3 of the capping and capping rack 2 are transmission-connected with the driving cylinder 2-7, and the driving cylinder 2-7 extends vertically up and down. The upper and lower driving plates 2-2 and 2-3 slide along the sliding rod 2-1 to the upper limit ring 2-10 and the lower limit ring 2-11, and the upper and lower sealing caps with elastic sealing rings are 1-1, 1-3 slide along the first sample tube 1-2, leave the first sample tube 1-2 to realize uncapping, when the first sample tube 1-2 completes uncapping, it rotates clockwise, and its trajectory is on the arc 7 of the extended tube clamp 3-4 of the manipulator, to the position of the sample tube output interface 4, the driver 6-5 of the tube lifting seat interface pushes the first and second tube lifting seat interfaces 6-6 and 6-7 to move to the second tube lifting seat interface 6-7. The center of the interface is at the position of circle 7, that is, the position where the manipulator 3 is extended, and then the tube lifting driver 6-1 drives the first and second tube lifting seats 6-7, 6-6 to the middle position in the vertical direction to insert the sample tube 1-2 into the first tube lifting seat interface 6-7. Each tube lifting seat interface has its own sealing retaining O-ring. At this time, the sample tube heater 5 is turned on. The robot 3 is moved to the tube taking position, and the tube clamp 3-4 of the robot 3 is opened, the robot is retracted, and the tube lifting seat is driven vertically back to the initial position to prepare for the loading of the second sample tube. The tube lifting seat interface driver 6-5 is retracted to the initial position, and the first and second tube lifting seat interfaces are fixed on the tube lifting seat slider 6-3 of the tube lifting seat, which can slide along the track 6-4. The robot 3 continues to rotate clockwise to the direction of the tube taking position of the sample tray and waits for the sample tray to rotate the second sample tube to the tube taking position. The tube clamp 3-4 of the robot 3 is opened, the robot is extended to the tube taking position, and then the tube clamp 3-4 is closed to clamp the sample tube. The robot 3 is retracted, and the robot 3 rotates counterclockwise to the capping and uncapping rack position. At this time, the capping and uncapping rack returns to the initial position after completing the uncapping of the first sample tube.And the second tube cap clamp 2-9 of the cap-on and cap-off rack is in the open state. The second sample tube 1-2 with the upper and lower sealing caps 1-1 and 1-3 is exactly at the center position of the second tube clamp 2-9 of the cap-on and cap-off rack. Then the second tube cap clamp 2-9 contracts to clamp the upper and lower sealing caps 1-1 and 1-3 of the second sample tube. Then the cap-on and cap-off rack slides along a pair of slide bars 2-1, driving the second tube cap clamp 2-9 of the cap-on and cap-off rack to move the upper and lower sealing caps 1-1 and 1-3 away from the second sample tube 1-2 in the vertical direction to achieve cap-off. Then the manipulator 3 rotates clockwise. The trajectory of the sample tube 1-1 is on the trajectory circle 8 of the tube clamp 3-4 at the contracted position of the manipulator. It stops in the direction of the line connecting the rotation center of the manipulator 3 and the sample tube output interface 4, and then extends. At this time, the second sample tube is exactly at the center of the second tube lifting seat interface 6-7. The tube lifting driver 6-1 drives the slide bar 6-2 to drive the entire tube lifting seat to rise to the middle position. The second sample tube 1-2 is inserted into the second tube lifting seat interface 6-7. Then the tube clamp 3-4 of the manipulator 3 opens and retracts to the initial position to wait for tube picking. The first and second sample tubes are inserted into the first and second tube lifting seat interfaces 6-6 and 6-7. At this time, the tube lifting driver 6-1 drives the slide bar 6-2, the rail head 6-4, and the tube lifting seat slider 6-3 to drive the first and second tube lifting seat interfaces 6-6 and 6-7 to rise, so that the two sample tubes are inserted into the first and second sample tube interfaces 4-2 and 4-1. The first and second sample tube interfaces 4-2 and 4-1 are both provided with elastic sealing rings to achieve the sealing of the sample tubes, thereby realizing the connection of the desorption pipeline including the sample tubes, realizing tube loading during stacking. The process of putting on the cap of the sample tube is opposite to the process of taking off the cap, and the sample tube is placed back to its original position on the sample tray.,

[0010] The advantages of the present invention are as follows:

[0011] To ensure that the sample tube is in a sealed state before analysis, to protect the sample tube packing and ensure the analysis quality, the best way is to place the sample tube with a sealing cap on the instrument sample tray. When analysis is required, the manipulator automatically picks up the sample tube and sends it to the cap-off mechanism to take off the cap, then sends it to the loading mechanism for loading, and then performs a series of sample processing procedures for analysis. It has been proven that this method is the best sample tube transfer connection method for thermal desorption so far. It is the transfer process of one or two sample tubes.

[0012] The sample tube transfer system with cap-on and cap-off functions can provide quality assurance for subsequent sample processing. The single-channel thermal desorption processes one sample at a time, and the entire detection system obtains one detection result. If a dual-channel processing method is adopted, the entire analysis efficiency can be increased by 50%, and the cost is greatly reduced, especially for the analysis of total volatile organic compounds with a very long analysis time, the effect is even greater.

[0013] The present invention realizes the stack - type tube loading of transferring and loading two sample tubes with a single - channel sample tube transfer system having capping and uncapping functions. According to this method, the uncapping loading and unloading capping of multiple sample tubes can be achieved.

[0014] The present invention uses the docking of a moving tube seat and a manipulator to reduce the requirements for complex hardware, providing convenience for realizing automation and intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the present invention.

[0016] Figure 2 is Figure 1 the top view of

[0017] Figure 3 is Figure 1 the right view of

[0018] Figure 4 is Figure 2 the A - A view of

[0019] Figure 5 is the bottom view and A - A view of the cap clip 2 - 8.

[0020] Figure 6 is the layout diagram of the air gripper.

[0021] Figure 7 is Figure 7 is Figure 2 the C - C sectional view of DETAILED DESCRIPTION OF THE INVENTION

[0022] The sample tray is a disc with multiple clamping clips, driven by a motor and controlled in position by a controller;

[0023] The manipulator is a device that can be rotated by a controller, with a telescopic robotic arm and a tube clip at one end of the robotic arm;

[0024] The uncapping rack is mainly composed of two vertical sliding rods, a driver that can move the uncapping plate for fixing the upper and lower uncapping clips up and down, and a limiter

[0025] The tube - lifting seat can move up and down and stay in an intermediate state, and can also move at the interface position with the two connecting tube outlets along the direction of the telescopic robotic arm;

[0026] The structure of the double - sample - tube heater is shown in the patent number ZL 2013 1 0023569.5, the thermal desorption primary sample - tube heater.

[0027] Thermal desorption dual-channel sample tube transfer system. On one side of the sample tray 1, there is a sample tube loading and output interface 4 opposite to the tube lifting seat interfaces 6-6 and 6-7 below it. There is a sample tube heater between them. One horizontal axial side of the sample tube heater is opposite to the manipulator 3 arranged in a non-horizontal plane. After the manipulator rotates 90 degrees, it is opposite to the cap removing and putting-on rack 2.

[0028] The tube picking position of the manipulator is set on the straight line connecting the two points of the rotation center 9 of the manipulator and the center 10 of the sample tray. And after the manipulator extends, the center of the tube clamp rotates around the rotation center of the manipulator to the tangent point of the circumference where the sample tube on the sample tray is located.

[0029] The loading of the sample tubes starts from the foremost position set by the thermal desorption method, and 2 sample tubes are continuously loaded. Among these two sample tubes, the first tube is placed at the loading position where the manipulator extends, and the corresponding cap removing and putting-on positions are also at the distal end.

[0030] Figure 5 Yes Figure 3 It is the bottom view of the upper cap clamp 2-8 and the A-A view of the two clamps of the cap clamp. The gripper cylinder 2-8-3 is a commercial gripper cylinder. The two cap clamps 2-8-1 and 2-8-2 are respectively fixed on the grippers 2-8-4 and 2-8-5. The gripper cylinder 2-8-3 can drive the grippers 2-8-4 and 2-8-5 to drive the cap clamps 2-8-1 and 2-8-2 to open and close left and right. The figure shows the state of contraction and closure. As shown in the A-A view, the cap clamps 2-8-1 and 2-8-2 have two arc-shaped surfaces, and the diameter of the upper arc surface is the same as the diameter of the cap column surface, and the diameter of the lower arc surface is smaller than the diameter of the cap column surface. Before the sample tube with a cap enters the cap removing rack 2, the gripper cylinder 2-8-3 drives the grippers 2-8-4 and 2-8-5 to open left and right. When the sample tube with a cap enters the cap removing rack 2 (as Figure 6 ), the gripper cylinder 2-8-3 drives the grippers 2-8-4 and 2-8-5 to contract left and right to drive the cap clamps 2-8-1 and 2-8-2 to close and clamp the cap.

[0031] The sample tube cap removing rack works as follows: Figure 7 Yes Figure 2 C-C sectional view of

[0032] When the sample tube with a tube cap enters the upper tube cap removal clamps 2-8-1 and 2-8-2 and the lower tube cap removal clamps 2-8-6 and 2-8-7 of the cap removal rack, the tube cap removal clamps contract left and right to clamp the upper and lower sealing caps 1-1 and 1-3, and then the first tube cap clamps 2-8 on the upper tube cap removal clamp fixing plate 2-2 and the lower tube cap removal clamp fixing plate 2-3 are respectively pulled upward and downward under the extension drive of the driving cylinder 2-7. Here, the upper tube cap removal fixing plate 2-2 is fixed on the piston rod of the driving cylinder 2-7, and the lower tube cap removal clamp fixing plate 2-3 is fixed on the cylinder block of the cylinder 2-7. Two sliders 2-12-1 and 2-12-2, 2-12-3 and 2-12-4 that slide along the cap removal rack slide rods 2-1-1 and 2-1-2 are fixed on the fixing plates 2-2 and 2-3 respectively. Since there are restraint rings 2-10 and 2-11 fixed on the slide rods, even if the upper and lower forces are inconsistent and the tube caps are not pulled out simultaneously, the slider that reaches the restraint position first at the other end will stop moving. Taking this as a fulcrum, the driving cylinder 2-7 continues to extend to pull off the other tube cap. The distance between the two restraint rings 2-10 and 2-11 on the same slide rod is exactly the maximum distance that the driving cylinder 2-7 extends to drive the upper and lower tube cap removal fixing plates 2-2 and 2-3 and thus drive the sliders to reach.

[0033] The capping process is the opposite of this.

[0034] When receiving the command to load the tube, the manipulator 3 rotates so that the center of the tube clamp 3-4 mounted on the manipulator 3 rotates to the straight line connecting its rotation center 9 and the center 10 of the sample tray 1. Then, the tube clamp 3-4 is extended and opened, and then closed to clamp the sample tube 11 on the sample tray 1. The cylinder 3-1 of the manipulator contracts to the initial position. When the manipulator 3 rotates counterclockwise to the line connecting the rotation center 9 of the manipulator and the sample tube loading output interface 4, the cylinder 3-1 of the manipulator 3 extends, and then continues to rotate to the position between the upper and lower fixing plates 2-2 and 2-3 of the cap removing and capping rack 2. The distance between the upper and lower fixing plates 2-2 and 2-3 driven by the driving cylinder 2-7 is limited by the limiting ring 2-6. Just the sample tube with the upper and lower sealing caps 1-1 and 1-3 can enter the opened first and second tube cap clamps 2-8 and 2-9 on the upper and lower fixing plates. The first tube cap clamp 2-8 is located at the extended position of the manipulator, and the second tube cap clamp 2-9 is located at the contracted position of the manipulator. Then, the first tube cap clamp 2-8 contracts to clamp the cap 1-1 of the first sample tube 1-2. At this time, the first sample tube with the sealing cap 1-1 is at the distal position where the manipulator extends. In the vertical direction, the upper and lower driving plates 2-2 and 2-3 of the cap removing and capping rack 2 are driven by the driving cylinder 2-7 to extend and slide along the sliding rod 2-1 to the upper limiting ring 2-10 and the lower limiting ring 2-11. Due to the upper and lower constraint limits, the upper and lower tube caps 1-1 and 1-3 with elastic sealing rings slide along the first sample tube 1-2 and leave the first sample tube 1-2 to achieve cap removal. At this time, the first sample tube 1-2 is clamped on the tube clamp 3-4 of the manipulator and remains stationary in the vertical direction. The first and second tube lifting seat interfaces 6-6 and 6-7 are at the lowest position. The first and second tube lifting seat interfaces 6-6 and 6-7 are two loading interfaces arranged horizontally axially as a whole and are respectively connected to their respective gas paths. When the first sample tube 1-2 completes cap removal, it rotates clockwise, and its trajectory is on the arc 7 of the extended tube clamp 3-4 of the manipulator to the loading position - the position of the sample tube output interface 4. Then, the driver 6-5 of the tube lifting seat interface pushes the first and second tube lifting seat interfaces 6-6 and 6-7 to move to the position where the center of the second tube lifting seat interface 6-7 is on the circle 7, that is, exactly at the position where the manipulator 3 extends. Then, the tube lifting cylinder 6-1 drives the first and second tube lifting seats 6-6 and 6-7 to the middle position in the vertical direction so that the sample tube 1-2 is inserted into the first tube lifting seat interface 6-6. Each tube lifting seat interface has its own sealing retaining O-ring. At this time, the sample tube heater 5 is turned on, which does not affect the extension and retraction of the manipulator 3. Then, the tube clamp 3-4 of the manipulator 3 is opened, the manipulator retracts, and the vertical drive of the tube lifting seat returns to the initial position to prepare for the loading of the second sample tube. The driver 6-5 of the tube lifting seat interface contracts to the initial position. The first and second tube lifting seat interfaces are fixed on the tube lifting seat slider 6-3 of the tube lifting seat and can slide along the track 6-4.

[0035] Then the manipulator 3 continues to rotate clockwise to wait in the direction of the tube-taking position of the sample tray for the sample tray to rotate the second sample tube to the tube-taking position. The tube clamp 3-4 of the manipulator 3 opens, the manipulator extends to the tube-taking position, then the tube clamp 3-4 closes to clamp the sample tube, the manipulator 3 retracts, and the manipulator 3 rotates counterclockwise to the position of the cap-on / cap-off rack. At this time, the cap-on / cap-off rack has returned to the initial position after completing the decapping of the first sample tube, and the second tube cap clamp 2-9 of the cap-on / cap-off rack is in the open state. The second sample tube 1-2 with the upper and lower sealing caps 1-1 and 1-3 is exactly at the center position of the second tube cap clamp 2-9 of the cap-on / cap-off rack. Then the second tube cap clamp 2-9 contracts to clamp the upper and lower sealing caps 1-1 and 1-3 of the second sample tube. Then the cap-on / cap-off rack slides along a pair of slide bars 2-1, driving the second cap-on tube clamp 2-9 of the cap-on / cap-off rack to move the upper and lower sealing caps 1-1 and 1-3 away from the second sample tube 1-2 in the vertical direction to achieve decapping. Then the manipulator 3 rotates clockwise. The trajectory of the sample tube 1-1 is on the trajectory circle 8 of the tube clamp 3-4 at the retracted position of the manipulator and stops in the direction of the line connecting the rotation center of the manipulator 3 and the sample tube output interface 4. Then it extends. At this time, the second sample tube is exactly at the center of the second tube lifting seat interface 6-7. The tube lifting driver 6-1 drives the slide bar 6-2 to drive the entire tube lifting seat to rise to the middle position. The second sample tube 1-2 is inserted into the second tube lifting seat interface 6-7. Then the tube clamp 3-4 of the manipulator 3 opens and retracts to the initial position to wait for tube-taking.

[0036] Now the first and second sample tubes are inserted into the first and second tube lifting seat interfaces 6-6 and 6-7. At this time, the tube lifting driver 6-1 drives the slide bar 6-2, the track 6-4, and the tube lifting seat slider 6-3 to drive the first and second tube lifting seat interfaces 6-6 and 6-7 to rise, so that the two sample tubes are inserted into the first and second sample tube interfaces 4-2 and 4-1. The first and second sample tube interfaces 4-2 and 4-1 are both provided with elastic sealing rings to achieve the sealing of the sample tubes, thereby realizing the connection of the desorption pipeline including the sample tubes and realizing the tube loading during stacking.

[0037] Also affecting the transfer of the sample tube here is the tube heater. Its existence does not allow the manipulator to rotate directly in the horizontal direction when loading or taking the sample tube. Therefore, the tube lifting seat must be movable to make way.

[0038] The process of taking the tube and putting on the cap is the reverse process of the tube loading method, and the sample tube is put back to its original position on the sample tray.

Claims

1. Thermal desorption dual-channel sample tube transfer system, characterized in that, At least one sample tube output interface (4-1) is provided on one side of the sample tray (1) and is opposite to a coaxial tube lifting seat interface (6-7) below the sample tray. The sample tube output interface and the tube lifting seat interface are connected to the gas path. A horizontal inlet and outlet space of a sample tube heater (5-1) is provided between the sample tube output interface and the tube lifting seat interface. The sample tube heater (5-1) is connected to a driver (5-2) by transmission. A manipulator (3) rotation center (9) is provided on one side of the sample tube heater. After the manipulator rotates an angle, its tube clamp (3-4) is vertically coaxial with the tube cap clamp of the cap removing and putting-on rack (2). The position of the manipulator taking the tube is set at the manipulator rotation center (9), the sample tray center (10 ) and the intersection of the circle where the sample tube on the sample tray is located, the manipulator rotates so that the center of the tube clamp installed on the manipulator rotates to the straight line connecting its rotation center and the center (10) of the sample tray, the tube clamp (3-4) extends and opens, closes and clamps the sample tube (1-2) on the sample tray, and then retracts, the manipulator rotates counterclockwise to between the upper and lower fixing plates (2-2), (2-3) of the capping and capping rack (2), the driving cylinder (2-7) is connected to the upper and lower fixing plates, the distance between the upper and lower fixing plates is limited by the two limiting rings (2-6) on the driving cylinder, and the upper and lower sealing caps (1-1), (1-3) are provided. The sample tube (1-2) can enter the opened first tube cap clamp (2-8) on the upper and lower fixed plates, and the tube cap clamp shrinks to clamp the upper and lower tube caps of the sample tube. The upper and lower fixed plates of the cap removal and capping rack are connected to the driving cylinder, and the driving cylinder extends vertically upward and downward. The upper and lower fixed plates slide along the sliding rod (2-1) to the position of the upper limit ring (2-10) and the lower limit ring (2-11). The upper and lower tube caps with elastic sealing rings slide along the sample tube and leave the sample tube to realize cap removal. After the sample tube is completely removed from the cap, it rotates clockwise to the position of the sample tube output interface (4). The driver (6-5) of the tube lifting seat interface is fixedly connected to the track (6-4) and connected to the tube lifting seat. The slide block (6-3) is connected by transmission, the tube lifting seat interface is fixedly connected to the tube lifting seat slide block, the tube lifting driver (6-1) is connected by transmission with the track (6-4) through the slide bar (6-2), drives the tube lifting seat to the middle position in the vertical direction so that the sample tube is inserted into the tube lifting seat interface, and the tube lifting seat interface has its own sealing O-ring, the tube clamp (3-4) of the manipulator is opened, the manipulator is retracted, and the tube lifting driver (6-1) drives the slide bar (6-2), the track (6-4), and the tube lifting seat slide block (6-3) to drive the tube lifting seat interface (6-7) to rise, so that the sample tube is inserted into the sample tube output interface (4-1), and the sample tube output interface has an elastic sealing ring. The sliding rod (2-1) consists of left and right sliding rods (2-1-1) and (2-1-2). The upper and lower fixing plates are fixedly connected to the piston rod and cylinder block of the driving cylinder (2-7) respectively. There are sliders at the left and right ends of the upper and lower fixing plates, which are slidably connected to the left and right sliding rods. When the sample tube with a tube cap enters the first and second upper de-capping tube clamps (2-8-1) and (2-8-2), and the first and second lower de-capping tube clamps (2-8-6) and (2-8-7) of the de-capping rack, the de-capping tube clamps contract left and right to clamp the upper and lower sealing caps (1-1) and (1-3). Then, the first tube cap clamp (2-8) fixed on the upper and lower fixing plates is pulled upward and downward respectively under the extension drive of the driving cylinder. Here, the upper fixing plate 2 is fixed on the piston rod of the driving cylinder, and the lower fixing plate is fixed on the cylinder block of the cylinder. There are two first sliders (2-12-1), second sliders (2-12-2), third sliders (2-12-3) and fourth sliders (2-12-4) fixed at both ends of the upper and lower fixing plates 2 and sliding along the left sliding rod (2-1-1) and right sliding rod (2-1-2). Since there are the first and second restraint rings (2-10) and (2-11) fixed on the sliding rod, even if the upper and lower forces are inconsistent and the tube caps are not pulled out simultaneously, the slider that reaches the restraint position first at the other end will stop moving, so as to drive the driving cylinder to continue to extend to pull off the other tube cap. The distance between the two restraint rings on the same sliding rod is exactly the longest distance that the driving cylinder drives the upper and lower fixing plates and thus drives the sliders to reach after extension. On one side of the sample tray (1), the first and second sample tube output interfaces (4-1) and (4-2) are opposite to the first and second tube lifting seat interfaces (6-7) and (6-6) coaxial with them below. The first and second tube lifting seat interfaces are at the lowest position. The first and second tube lifting seat interfaces are two loading interfaces arranged horizontally axially as a whole, and are respectively connected to their respective gas paths. There is a horizontal access space for the sample tube heater between the first and second sample tube output interfaces and the first and second tube lifting seat interfaces coaxial with them below. The sample tube heater has a rotation center (9) of the manipulator in the horizontal direction. After the manipulator rotates counterclockwise by 90 degrees, its tube clamp (3-4) is vertically coaxial with the first tube cap clamp (2-8) or the second tube cap clamp (2-9) of the de-capping and capping rack. The tube picking position of the manipulator is set at the intersection of the line connecting the rotation center of the manipulator and the center of the sample tray and the circumference where the sample tubes on the sample tray are located.

2. The thermal desorption dual-channel sample tube transfer system according to claim 1, wherein The loading of the sample tube starts from the front position set by the thermal desorption method, and two sample tubes are loaded continuously. Among the two sample tubes, the first sample tube is first placed in the loading position of the robot's extended position. When receiving the tube loading command, the robot rotates so that the center of the tube clamp installed on the robot rotates to the straight line connecting its rotation center and the center of the sample tray 1, and then extends the tube clamp and opens it, closes it and clamps the first sample tube on the sample tray 1, and the cylinder (3-1) of the robot shrinks to the initial position. When the robot rotates counterclockwise to the line connecting the rotation center of the robot and the sample tube output interface, the cylinder of the robot extends and continues to rotate to between the upper and lower fixed plates of the capping and capping rack, and the space between the upper and lower fixed plates driven by the driving cylinder (2-7) is The distance is limited by a limiting ring (2-6), and the first sample tube with upper and lower sealing caps (1-1) and (1-3) can enter the opened first tube cap clamp (2-8) on the upper and lower fixed plates. The first tube cap clamp is located at the extended position of the manipulator, and the second tube cap clamp (2-9) is located at the retracted position of the manipulator. The first tube cap clamp retracts to clamp the upper and lower sealing caps (1-1, 1-3) of the first sample tube (1-2). The upper and lower fixed plates of the cap removal and capping rack are connected to the driving cylinder in a transmission manner. The driving cylinder extends vertically up and down, and the upper and lower fixed plates slide along the first and second sliding rods to the positions of the upper limiting ring (2-10) and the lower limiting ring (2-11). The upper and lower sealing caps (1-1) and (1-3) with elastic sealing rings slide along the first sample tube. The robot moves to leave the first sample tube to remove the cap. When the first sample tube is removed from the cap, it rotates clockwise, and its trajectory is on the arc (7) of the extended tube clamp (3-4) of the manipulator to the position of the sample tube output interface (4). The driver (6-5) of the tube lifting seat interface pushes the first and second tube lifting seat interfaces (6-6) and (6-7) to move to the position of the second tube lifting seat interface center at the arc position, that is, the position where the robot is extended. Then the tube lifting driver (6-1) drives the first and second tube lifting seats to the middle position in the vertical direction so that the first sample tube is inserted into the first tube lifting seat interface. Each tube lifting seat interface has its own sealing retaining O-ring. At this time, the sample tube heater (5) is turned on and does not affect the extension and retraction of the robot. Then the machine The tube clamp of the manipulator opens, the manipulator retracts, and the tube lifting seat is driven vertically back to the initial position to prepare for the loading of the second sample tube. The tube lifting seat interface driver retracts to the initial position. The first and second tube lifting seat interfaces are fixed on the tube lifting seat slider (6-3), which can slide along the track (6-4). The manipulator continues to rotate clockwise to the direction of the tube removal position of the sample tray and waits for the sample tray to rotate the second sample tube to the tube removal position. The tube clamp of the manipulator opens, the manipulator extends to the tube removal position, and then the tube clamp closes to clamp the second sample tube. The manipulator retracts and rotates counterclockwise to the capping and uncapping rack position. At this time, the capping and uncapping rack returns to the initial position after completing the uncapping of the first sample tube, and the second tube cap clamp (2-9) of the capping and uncapping rack is in the open state.The second sample tube with upper and lower sealing caps (1-1) and (1-3) is exactly at the center position of the second tube cap clamp (2-9) of the cap putting-on and taking-off rack. Then, the second tube cap clamp (2-9) contracts to clamp the upper and lower sealing caps of the second sample tube. Then, the cap putting-on and taking-off rack slides along a pair of sliding rods, driving the second cap putting-on tube clamp of the cap putting-on and taking-off rack to move the upper and lower sealing caps away from the second sample tube in the vertical direction to achieve cap taking-off. Then, the manipulator rotates clockwise. The trajectory of the sample tube is on the trajectory circle (8) of the clamp (3-4) at the contracted position of the manipulator and stops at the direction of the connection line between the rotation center of the manipulator and the sample tube output interface. Then, it extends. At this time, the second sample tube is exactly at the center of the second tube lifting seat interface. The tube lifting driver (6-1) drives the sliding rod (6-2) to drive the entire tube lifting seat to rise to the middle position. The second sample tube is inserted into the second tube lifting seat interface (6-7). Then, the clamp of the manipulator opens and retracts to the initial position to wait for tube taking. The first and second sample tubes are inserted into the first and second tube lifting seat interfaces (6-6) and (6-7). At this time, the tube lifting driver drives the sliding rod, track (6-4), and tube lifting seat slider (6-3) to drive the first and second tube lifting seat interfaces to rise, so that the two sample tubes are inserted into the first and second sample tube interfaces. Both the first and second sample tube interfaces are provided with elastic sealing rings to achieve the sealing of the sample tubes, thereby realizing the connection of the desorption pipeline including the sample tubes, realizing tube loading during stacking. The process of putting a cap on the sample tube is opposite to the cap taking-off process, and the sample tube is placed back to its original position on the sample tray.,

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