A sample injection device and method for liquid chromatography detection

Abstract

The application discloses a sample feeding device and method for liquid chromatograph detection and belongs to the technical field of chromatographs. The device comprises a sample feeding box, a sample feeding disc is arranged on the sample feeding box, a plurality of sample tubes are arranged on the sample feeding disc, a rotating disc is arranged in the sample feeding box, a connecting plate is arranged on one side of the rotating disc, an adjusting structure for adjusting the position of the connecting plate is arranged on the rotating disc, two limiting plates are fixedly arranged on one side of the connecting plate, a mounting block is arranged between the two limiting plates, a limiting block is arranged on the limiting plate, a limiting groove is formed in the mounting block, a sampling tube is fixedly arranged on one side of the mounting block, a protective plate is arranged on the mounting block, and a sample inlet is arranged in the sample feeding box. When the sample feeding device is not in use, the protective plate can protect the sampling tube, and when the sampling tube is subjected to external accidental collision, the protective plate can preferentially bear the collision force, so that the sampling tube is prevented from being in contact with external objects, the risk of deformation and breakage of the sampling tube caused by collision is reduced, and the service life of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to a sample injection device and method for liquid chromatograph detection and belongs to the technical field of chromatographs. BACKGROUND

[0002] In the technical field of liquid chromatograph detection, a sample injection device is a key link for sample detection, and the stability and reliability of the sample injection device directly affect the accuracy of the detection result and the service life of the equipment. During the sample injection process of the liquid chromatograph, a sampling tube is a core component directly contacting the sample, and usually needs to be frequently operated for sampling and pipetting. However, the existing sampling tube is exposed to the external environment for a long time in a non-working state, is easily subjected to external collision, accidental touch and other accidental impacts, and is deformed and broken, thereby reducing the service life. SUMMARY

[0003] The application aims to solve the problem that the existing sampling tube is exposed to the external environment for a long time in a non-working state, is easily subjected to external collision, accidental touch and other accidental impacts, is deformed and broken, and the service life is reduced.

[0004] The application adopts the following technical scheme to solve the above technical problem: a sample injection device and method for liquid chromatograph detection, comprising a sample injection box, a sample injection disc is arranged on the sample injection box, a plurality of sample tubes are arranged on the sample injection disc, a first driving structure for driving the sample injection disc to move is arranged on the sample injection box, a rotating disc is arranged in the sample injection box, a second driving structure for driving the rotating disc to move is arranged on the sample injection box, a connecting plate is arranged on one side of the rotating disc, an adjusting structure for adjusting the position of the connecting plate is arranged on the rotating disc, two limiting plates are fixedly arranged on one side of the connecting plate, a mounting block is arranged between the two limiting plates, a limiting block is arranged on the limiting plate, a limiting groove is formed in the mounting block, a moving structure for inserting the limiting block and the limiting groove is arranged on the limiting plate, a sampling tube is fixedly arranged on one side of the mounting block, a protective plate is arranged on the mounting block, and a pushing structure for pushing the protective plate is arranged on the mounting block. A sample injection port is arranged in the sample injection box.

[0005] By adopting the above technical scheme, the sampling tube is protected by the protective plate when no sample injection is needed, and the protective plate can preferentially bear the collision force when the sampling tube is subjected to external accidental collision, so that the sampling tube is prevented from contacting external objects, the risk of deformation and breakage of the sampling tube caused by collision is reduced, and the service life of the device is improved.

[0006] The application is further provided with: the first driving structure comprises a first placing groove, a first motor and a first rotating shaft, the first placing groove is arranged on the sample feeding box, the first motor is fixedly arranged in the first placing groove, the first rotating shaft is in power connection with the first motor, and one end of the first rotating shaft extends to the outside of the sample feeding box and is fixedly connected with the sample feeding disc.

[0007] The application is further provided with: the second driving structure comprises a second placing groove, a second motor and a second rotating shaft, the second placing groove is arranged on the sample feeding box, the second motor is fixedly arranged in the second placing groove, the second rotating shaft is in power connection with the second motor, and one end of the second rotating shaft extends to the inside of the sample feeding box and is fixedly connected with the rotating disc.

[0008] The application is further provided with: the adjusting structure comprises a third motor, a threaded rod, a sample feeding groove, a disc and an extension rod, the third motor is fixedly arranged on the rotating disc, the threaded rod is in power connection with the third motor, the threaded rod is in threaded connection with the connecting plate, the sample feeding groove is arranged on the inner wall of the sample feeding box, the disc is slidingly arranged in the sample feeding groove, one end of the threaded rod, away from the third motor, extends to the inside of the sample feeding groove and is in rotational connection with the disc, and the extension rod is fixedly arranged on the rotating disc and the extension rod is fixedly connected with the connecting plate at the extension end.

[0009] The application is further provided with: the mounting block is provided with a mounting groove, and an electric push rod is fixedly arranged in the mounting groove, and an output end of the electric push rod extends to the inside of the sampling pipe and is fixedly provided with a piston.

[0010] The application is further provided with: the pushing structure comprises a receiving groove, a positioning groove, a positioning block, an inner groove, a push plate, a fixing groove and a first spring, the receiving groove is arranged on the mounting block, the protection plate is slidingly arranged in the receiving groove, the positioning groove is arranged on the mounting block and is in communication with the receiving groove, the positioning block is slidingly arranged in the positioning groove, one side of the positioning block extends to the inside of the receiving groove and is fixedly connected with the protection plate, the inner groove is arranged on the positioning block, the push plate is slidingly arranged in the inner groove, one end of the push plate, away from the positioning block, extends to the outside of the mounting block, the fixing groove is arranged on the mounting block and is in communication with the positioning groove, the push plate can abut against the fixing groove, and the first spring is arranged between the positioning block and the positioning groove, and the two ends of the first spring are fixedly connected with the inner wall of the positioning block and the positioning groove respectively.

[0011] By adopting the above technical scheme, the positioning block is driven to slide in the positioning groove by pushing the push plate, the positioning block drives the protection plate to move in the receiving groove towards the sampling pipe, the positioning block is compressed in the moving process, and when the protection plate moves to the appropriate position, the push plate is flush with the fixing groove, the push plate is slidingly arranged in the inner groove, the push plate is moved to the inside of the fixing groove, and the protection plate is limited.

[0012] The mobile structure comprises a protruding block, a sliding groove, a guide groove, a sliding block, a guide block, a second spring and a handle, the protruding block is fixedly arranged on the limiting plate, the sliding groove is arranged on the limiting plate and extends to the inside of the protruding block, the sliding block is slidingly arranged in the inside of the sliding groove, the guide groove is arranged on the limiting plate and communicates with the sliding groove, the guide block is slidingly arranged in the inside of the guide groove, the limiting block is fixedly connected with the guide block, the limiting block can extend to the outside of the limiting plate and is inserted with the limiting groove, one end of the sliding block extends to the inside of the guide groove and is fixedly connected with the guide block, the handle is fixedly arranged on the side of the sliding block away from the guide block, one end of the handle extends to the outside of the limiting plate, and the second spring is arranged between the sliding groove and the sliding block, and the two ends of the second spring are fixedly connected with the sliding block and the inner wall of the sliding groove respectively.

[0013] The limiting plate is provided with a first assembly groove in communication with the guide groove, the guide block is provided with a second assembly groove, the protective plate is fixedly provided with an assembly plate, one end of the assembly plate extends to the outside of the mounting block and can be inserted through the first assembly groove and the second assembly groove.

[0014] By adopting the above technical scheme, the protective plate drives the assembly plate to move in the first assembly groove away from the second assembly groove during movement, so that the assembly plate and the second assembly groove are separated from the first assembly groove, at this time, the limiting of the guide block can be cancelled, at this time, the handle is pulled to drive the sliding block to slide in the sliding groove, so that the sliding block drives the guide block to slide in the guide groove, the sliding block is compressed during sliding, at this time, the guide block drives the limiting block to move away from the limiting groove, so that the limiting block is separated from the limiting groove, thereby cancelling the limiting of the limiting plate and the mounting block, and then the mounting block can be disassembled, so that the sampling tube is disassembled, the sampling tube is maintained and maintained by the staff, the sampling tube is disassembled under the protection of the protective plate, external accidental collision or accidental touch is effectively blocked, damage of the sampling tube due to accidental contact during disassembly operation is avoided, and the safety performance of the device is further improved.

[0015] The sampling disc is provided with a sample groove, the sample tube is arranged in the inside of the sample groove, the sampling disc is further provided with a connecting groove in communication with the sample groove, a push rod is slidingly arranged in the connecting groove, one end of the push rod extends to the inside of the sample groove and is fixedly provided with a tray, the sample tube can abut against the tray, and the other end of the push rod extends to the outside of the sampling disc.

[0016] A sampling method of a sampling device for liquid chromatograph detection, the sampling method comprises:

[0017] S1: first, place the sample tube on the sampling disc;

[0018] S2: the first drive structure drives the sample disc to rotate, so that the sample disc drives the sample tube to move to the lower side of the sampling tube;

[0019] S3: the adjusting structure drives the connecting plate to move, so that the connecting plate drives the sampling tube to be inserted into the sample tube for sampling;

[0020] S4: after sampling, the adjusting structure drives the connecting plate to move away from the sample tube, so that the connecting plate drives the sampling tube to separate from the sample tube;

[0021] S5: the second drive structure drives the rotating disc to rotate, so that the rotating disc drives the connecting plate and the sampling tube to rotate, and the sampling tube is aligned with the sample inlet;

[0022] S6: the adjusting structure drives the connecting plate to move, so that the connecting plate drives the sampling tube to be inserted into the sample inlet, and the sample is transported into the sample inlet;

[0023] S7: after sampling, the adjusting structure drives the connecting plate to move away from the sample inlet, so that the connecting plate drives the sampling tube to separate from the sample inlet;

[0024] S8: the second drive structure drives the rotating disc to rotate, so that the rotating disc drives the connecting plate and the sampling tube to rotate, and the sampling tube is aligned with the sample tube, that is, the sampling is completed.

[0025] The beneficial effects of the present application are: when there is no need for sampling, the sampling tube is protected by the protective plate, and when an external accidental collision occurs, the protective plate can preferentially bear the collision force, avoiding contact between the sampling tube and external objects, thereby reducing the risk of deformation and rupture of the sampling tube due to collision, and the sampling tube is removed under the protection of the protective plate, effectively blocking external accidental collision or accidental touch, avoiding damage to the sampling tube due to accidental contact during disassembly operation, further improving the safety performance of the device and prolonging the service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0027] Figure 2 is a schematic diagram of the cross-sectional structure of the present application;

[0028] Figure 3 is a schematic diagram of the local structure of the present application;

[0029] Figure 4 is a schematic diagram of the Figure 3 is an enlarged schematic diagram of position A in the present application;

[0030] Figure 5 is a schematic diagram of the cross-sectional structure of the mounting block in the present application;

[0031] Figure 6 Schematic diagram of the explosion structure of the present application;

[0032] Figure 7 Schematic diagram of the explosion structure of the present application; Figure 7 Schematic diagram of the explosion structure of the present application;

[0033] Figure 8 Schematic diagram of the explosion structure of the present application;

[0034] Figure 9 Schematic diagram of the explosion structure of the present application; Figure 8 Schematic diagram of the explosion structure of the present application.

[0035] In the figure: 1, sample box; 2, sample disc; 3, sample tube; 4, rotating disc; 5, connecting plate; 6, limiting plate; 7, mounting block; 8, sample tube; 9, protective plate; 10, limiting block; 11, limiting groove; 12, sample inlet; 1011, first placement groove; 1012, first motor; 1013, first rotating shaft; 1021, second placement groove; 1022, second motor; 1023, second rotating shaft; 1031, third motor; 1032, threaded rod; 1033, sample slot; 1034, disc; 1035, telescopic rod; 1041, mounting groove; 1042, electric push rod; 1043, piston; 1051, storage groove; 1052, positioning groove; 1053, positioning block; 1054, inner groove; 1055, push plate; 1056, fixed groove; 1057, first spring; 1061, protruding block; 1062, sliding groove; 1063, guide groove; 1064, sliding block; 1065, guide block; 1066, second spring; 1067, handle; 1071, first assembly groove; 1072, second assembly groove; 1073, assembly plate; 1081, sample slot; 1082, connecting groove; 1083, push rod; 1084, tray. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific figures.

[0037] As Figures 1 to 4As shown in the figure, a sample injection device and method for liquid chromatograph detection, comprising a sample injection box 1 connected with an external chromatograph, a sample injection tray 2 is arranged on the sample injection box 1, a plurality of sample tubes 3 are arranged on the sample injection tray 2, a first driving structure for driving the sample injection tray 2 to move is arranged on the sample injection box 1, a rotating disc 4 is arranged inside the sample injection box 1, a second driving structure for driving the rotating disc 4 to move is arranged on the sample injection box 1, a connecting plate 5 is arranged on one side of the rotating disc 4, an adjusting structure for adjusting the position of the connecting plate 5 is arranged on the rotating disc 4, two limiting plates 6 are fixedly arranged on one side of the connecting plate 5, an installation block 7 is arranged between the two limiting plates 6, limiting blocks 10 are arranged on the two limiting plates 6, a limiting groove 11 is formed on the installation block 7, moving structures are arranged on the limiting plates 6 respectively for inserting the limiting blocks 10 and the limiting groove 11, a sampling tube 8 is fixedly arranged on one side of the installation block 7, protective plates 9 are arranged on the installation block 7, the protective plates 9 are used for protecting the sampling tube 8, pushing structures are arranged on the installation block 7 for pushing the protective plates 9, the pushing structures correspond to the protective plates 9 respectively, a sample injection port 12 is arranged inside the sample injection box 1, and the sample injection port 12 is connected with a sample injection tube on the external chromatograph.

[0038] As shown in the figure, Figure 2 The first driving structure comprises a first placing groove 1011, a first motor 1012 and a first rotating shaft 1013, the first placing groove 1011 is vertically formed on the sample injection box 1, the first motor 1012 is fixedly arranged inside the first placing groove 1011, the first rotating shaft 1013 is power-connected with the first motor 1012, and one end of the first rotating shaft 1013 extends to the outside of the sample injection box 1 and is fixedly connected with the sample injection tray 2.

[0039] As shown in the figure, Figure 2 The second driving structure comprises a second placing groove 1021, a second motor 1022 and a second rotating shaft 1023, the second placing groove 1021 is vertically formed on the sample injection box 1, the second motor 1022 is fixedly arranged inside the second placing groove 1021, the second rotating shaft 1023 is power-connected with the second motor 1022, and one end of the second rotating shaft 1023 extends to the inside of the sample injection box 1 and is fixedly connected with the rotating disc 4.

[0040] As shown in the figure, Figure 2As shown, the adjusting structure includes a third motor 1031, a threaded rod 1032, a sample inlet groove 1033, a disc 1034 and an extension rod 1035, the third motor 1031 is fixedly arranged on the rotating disc 4, the threaded rod 1032 is in power connection with the third motor 1031, the threaded rod 1032 is in threaded connection with the connecting plate 5, the sample inlet groove 1033 is arranged on the inner wall of the sample box 1, the sample inlet groove 1033 is circular, the sample inlet groove 1033 has the same center as the rotating disc 4, the disc 1034 is slidably arranged in the sample inlet groove 1033, the threaded rod 1032 extends to the inside of the sample inlet groove 1033 and is in rotational connection with the disc 1034 at the end away from the third motor 1031, the extension rod 1035 is fixedly arranged on the rotating disc 4, the extension rod 1035 is in fixed connection with the connecting plate 5, the extension rod 1035 is divided into two sections, the two sections of the extension rod 1035 are in fixed connection with the rotating disc 4 and the connecting plate 5 respectively, the extension end of the extension rod 1035 is fixedly arranged with the connecting plate 5, the extension rod 1035 moves synchronously with the connecting plate 5 when the connecting plate 5 moves, thereby limiting and guiding the connecting plate 5 and avoiding deviation. The first motor 1012, the second motor 1022 and the third motor 1031 are connected with an external power source, and the external power source provides power for the first motor 1012, the second motor 1022 and the third motor 1031.

[0041] As shown in Figure 5 and Figure 6 As shown, the mounting groove 1041 is vertically arranged on the mounting block 7, the electric push rod 1042 is fixedly arranged in the mounting groove 1041, the electric push rod 1042 is connected with an external power source, the external power source provides power for the electric push rod 1042, the output end of the electric push rod 1042 extends to the inside of the sampling tube 8 and is fixedly arranged with a piston 1043, and the piston 1043 is in sliding connection with the inside of the sampling tube 8.

[0042] As shown in Figure 6As shown, the pushing structure comprises a receiving groove 1051, a positioning groove 1052, a positioning block 1053, an inner groove 1054, a push plate 1055, a fixing groove 1056 and a first spring 1057. The receiving groove 1051 is arranged on the mounting block 7, and the arrangement direction of the receiving groove 1051 is the same as that of the mounting groove 1041. The protective plate 9 is slidingly arranged in the receiving groove 1051, and slides along the arrangement direction of the receiving groove 1051. The positioning groove 1052 is arranged on the mounting block 7 and communicates with the receiving groove 1051. The arrangement direction of the positioning groove 1052 is the same as that of the receiving groove 1051. The positioning block 1053 is slidingly arranged in the positioning groove 1052. One side of the positioning block 1053 extends to the inside of the receiving groove 1051 and is fixedly connected with the protective plate 9. The positioning block 1053 moves synchronously to drive the protective plate 9 to move. The inner groove 1054 is horizontally arranged on the positioning block 1053. The push plate 1055 is slidingly arranged in the inner groove 1054. One end of the push plate 1055 away from the positioning block 1053 extends to the outside of the mounting block 7. The fixing groove 1056 is arranged on the mounting block 7 and communicates with the positioning groove 1052. The push plate 1055 can abut against the fixing groove 1056. The push plate 1055 can move along the arrangement direction of the inner groove 1054 to abut against the fixing groove 1056. The first spring 1057 is arranged between the positioning block 1053 and the positioning groove 1052. Both ends of the first spring 1057 are fixedly connected with the inner wall of the positioning block 1053 and the positioning groove 1052, respectively. The first spring 1057 is in a tension state when not under stress. At this time, the protective plate 9 is located in the receiving groove 1051. The first spring 1057 is in a compression state when under stress. At this time, one end of the protective plate 9 extends to the outside of the receiving groove 1051.

[0043] As Figures 5 to 7As shown, the moving structure comprises a protruding block 1061, a sliding groove 1062, a guide groove 1063, a sliding block 1064, a guide block 1065, a second spring 1066 and a handle 1067, the protruding block 1061 is fixedly arranged on the limiting plate 6 away from the mounting block 7, the sliding groove 1062 is horizontally arranged on the limiting plate 6 and extends to the inside of the protruding block 1061, the sliding block 1064 is slidingly arranged in the sliding groove 1062, the sliding block 1064 slides along the arrangement direction of the sliding groove 1062, the guide groove 1063 is arranged on the limiting plate 6 and communicates with the sliding groove 1062, the guide groove 1063 is arranged as a one-way opening, the guide block 1065 is slidingly arranged in the guide groove 1063, the limiting block 10 is fixedly connected with the guide block 1065, the guide block 1065 moves synchronously with the sliding block 1064, one end of the limiting block 10 away from the guide block 1065 can extend to the outside of the limiting plate 6 and is inserted with the limiting groove 11, one side of the guide block 1065 away from the limiting block 10 can move to the outside of the limiting plate 6 through the one-way opening, one end of the sliding block 1064 extends to the inside of the guide groove 1063 and is fixedly connected with the guide block 1065, the handle 1067 is fixedly arranged on one side of the sliding block 1064 away from the guide block 1065, one end of the handle 1067 extends to the outside of the limiting plate 6, the second spring 1066 is arranged between the sliding groove 1062 and the sliding block 1064, both ends of the second spring 1066 are fixedly connected with the sliding block 1064 and the inner wall of the sliding groove 1062 respectively, the second spring 1066 is in a tension state when not under stress, at this time, the limiting block 10 and the limiting groove 11 are in an inserted state, the second spring 1066 is in a compressed state when under stress, at this time, the limiting block 10 and the limiting groove 11 are in a separated state.

[0044] As shown in Figure 6 , a first assembly groove 1071 is vertically arranged on the limiting plate 6 and communicates with the guide groove 1063, a second assembly groove 1072 is arranged on the guide block 1065, the limiting block 10 and the limiting groove 11 are in an inserted state, at this time, the first assembly groove 1071 is aligned with the second assembly groove 1072, an assembly plate 1073 is fixedly arranged on the protective plate 9, the assembly plate 1073 is L-shaped, one end of the assembly plate 1073 extends to the outside of the mounting block 7 and can be inserted through the first assembly groove 1071 and the second assembly groove 1072.

[0045] As shown in Figure 8 and Figure 9As shown, the sample tray 2 is provided with sample grooves 1081, and the sample grooves 1081 are provided with a plurality of sample grooves 1081 arranged in a circular array along the circumference of the sample tray 2. The sample tube 3 is arranged in the sample groove 1081. The sample tray 2 is also provided with a connecting groove 1082 communicating with the sample groove 1081. The connecting groove 1082 is slidably provided with a push rod 1083. One end of the push rod 1083 extends into the sample groove 1081 and is fixedly provided with a tray 1084. The sample tube 3 can abut against the tray 1084. The other end of the push rod 1083 extends to the outside of the sample tray 2.

[0046] When the sample is not needed, the positioning block 1053 is slid in the positioning groove 1052 by pushing the dial plate 1055, so that the positioning block 1053 drives the protective plate 9 to move in the storage groove 1051 towards the sampling tube 8. The positioning block 1053 compresses the first spring 1057 during the movement. When the protective plate 9 moves to the appropriate position, the dial plate 1055 is flush with the fixed groove 1056 at this time. At this time, the dial plate 1055 is slid in the inner groove 1054, so that the dial plate 1055 moves to the inside of the fixed groove 1056, thereby limiting the protective plate 9. The protective plate 9 protects the sampling tube 8. When an external accidental collision occurs, the protective plate 9 can preferentially bear the collision force, thereby avoiding the sampling tube 8 from contacting external objects, reducing the risk of deformation and rupture of the sampling tube 8 caused by collision, and improving the service life of the device.

[0047] During the movement of the protective plate 9, the assembly plate 1073 is simultaneously driven to move in the first assembly groove 1071 away from the second assembly groove 1072, so that the assembly plate 1073 and the second assembly groove 1072 are separated from the first assembly groove 1071. At this time, the limiting of the guide block 1065 can be cancelled. At this time, the sliding block 1064 is slid in the sliding groove 1062 by pulling the handle 1067, so that the sliding block 1064 simultaneously drives the guide block 1065 to slide in the guide groove 1063. The sliding block 1064 compresses the second spring 1066 during the sliding. At this time, the guide block 1065 drives the limiting block 10 to move away from the limiting groove 11, so that the limiting block 10 is separated from the limiting groove 11, thereby cancelling the limiting of the limiting plate 6 and the mounting block 7. Then, the mounting block 7 can be disassembled, thereby completing the disassembly of the sampling tube 8. The sampling tube 8 can be disassembled, which facilitates the maintenance and maintenance of the sampling tube 8 by the staff. The sampling tube 8 is disassembled under the protection of the protective plate 9, which effectively blocks external accidental collision or accidental touch, avoids damage of the sampling tube 8 caused by accidental contact during disassembly operation, and further improves the safety performance of the device.

[0048] When the sampling tube 8 is installed, first pull the handle 1067 to drive the sliding block 1064 to slide in the sliding groove 1062, so that the sliding block 1064 synchronously drives the guide block 1065 to slide in the guide groove 1063, and the second spring 1066 is compressed in the sliding process. At this time, the guide block 1065 drives the limiting block 10 to move, so that the limiting block 10 is retracted into the guide groove 1063. Then, the mounting block 7 is abutted with the limiting plate 6. At this time, the handle 1067 is released, the second spring 1066 is reset to drive the sliding block 1064 to slide in the sliding groove 1062, so that the sliding block 1064 drives the guide block 1065 to slide in the guide groove 1063. The guide block 1065 synchronously drives the limiting block 10 to move in the direction of the limiting groove 11 in the moving process, so that the limiting block 10 is inserted into the limiting groove 11. The connection of the limiting plate 6 and the mounting block 7 is completed.

[0049] When the sample needs to be taken, the push plate 1055 is pushed to move in the inner groove 1054 away from the fixed groove 1056, so that the abutment and limitation of the push plate 1055 and the fixed groove 1056 are cancelled. At this time, the first spring 1057 is reset to drive the positioning block 1053 to slide in the positioning groove 1052, so that the positioning block 1053 synchronously drives the protective plate 9 to slide into the storage groove 1051 in the moving process, so that the protective plate 9 is stored in the inner part of the storage groove 1051. The protection of the sampling tube 8 is cancelled. The protective plate 9 synchronously drives the assembly plate 1073 to move in the direction of the first assembly groove 1071 in the moving process, so that the assembly plate 1073 passes through the first assembly groove 1071 and is inserted into the second assembly groove 1072. The limiting block 10 is positioned, so as to further limit the position of the limiting block 10. In the working process, the sampling tube 8 is effectively prevented from shaking and deviating due to component displacement in the sampling process, so as to ensure the accuracy of the sampling and sampling operation and improve the stability of the whole device.

[0050] When the sample tube 3 needs to be taken out, the push rod 1083 is pulled to move in the connecting groove 1082, so that the push rod 1083 drives the tray 1084 to move. The tray 1084 pushes the sample tube 3 to move away from the sample groove 1081, so as to facilitate the taking out of the sample tube 3.

[0051] A sampling method of a sampling device for liquid chromatograph detection, the sampling method comprising:

[0052] S1: first, the sample tube 3 to be detected is placed in the sample groove 1081 on the sampling disc 2;

[0053] S2: the first motor 1012 in the first driving structure drives the first rotating shaft 1013 to rotate, so that the first rotating shaft 1013 drives the sampling disc 2 to rotate, and the sampling disc 2 drives the sample tube 3 to move to the lower part of the sampling tube 8;

[0054] S3: The third motor 1031 in the adjusting structure drives the threaded rod 1032 to rotate, the threaded rod 1032 drives the connecting plate 5 to move under the action of the threaded structure, the connecting plate 5 drives the sampling tube 8 to be inserted into the inside of the sample tube 3, then the electric push rod 1042 is started to drive the piston 1043 to slide in the sampling tube 8, and the pressure difference in the sampling tube 8 is changed by the piston 1043 to sample the sample into the inside of the sampling tube 8;

[0055] S4: After sampling is completed, the third motor 1031 in the adjusting structure is started again to drive the threaded rod 1032 to rotate, the threaded rod 1032 drives the connecting plate 5 to move under the action of the threaded structure, the connecting plate 5 drives the sampling tube 8 to move away from the sample tube 3, so that the connecting plate 5 drives the sampling tube 8 to be separated from the sample tube 3.

[0056] S5: The second motor 1022 in the second driving structure drives the second rotating shaft 1023 to rotate, the second rotating shaft 1023 drives the rotating disc 4 to rotate, the rotating disc 4 drives the third motor 1031, the threaded rod 1032, the disc 1034, the telescopic rod 1035, the connecting plate 5 and the sampling tube 8 to rotate in the rotating process, the threaded rod 1032 drives the disc 1034 to slide along the inside of the sampling groove 1033 when moving, the connecting plate 5 and the sampling tube 8 are guided and limited by the sampling groove 1033, and then the sampling tube 8 is aligned with the sampling inlet 12.

[0057] S6: The third motor 1031 in the adjusting structure drives the threaded rod 1032 to rotate, the threaded rod 1032 drives the connecting plate 5 to move under the action of the threaded structure, the connecting plate 5 drives the sampling tube 8 to be inserted into the inside of the sampling inlet 12, the electric push rod 1042 is started to drive the piston 1043 to slide in the sampling tube 8, and the sample is delivered into the sampling inlet 12.

[0058] S7: After sampling is completed, the third motor 1031 in the adjusting structure is started again to drive the threaded rod 1032 to rotate, the threaded rod 1032 drives the connecting plate 5 to move away from the sampling inlet 12, so that the connecting plate 5 drives the sampling tube 8 to be separated from the sampling inlet 12.

[0059] S8: The second motor 1022 in the second driving structure drives the second rotating shaft 1023 to rotate, the second rotating shaft 1023 drives the rotating disc 4 to rotate, the rotating disc 4 drives the third motor 1031, the threaded rod 1032, the disc 1034, the telescopic rod 1035, the connecting plate 5 and the sampling tube 8 to rotate in the rotating process, the threaded rod 1032 drives the disc 1034 to slide along the inside of the sampling groove 1033 when moving, and the sampling tube 8 is aligned with the sample tube 3, that is, sampling can be completed.

[0060] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and such changes and improvements are all within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A sample introduction device for liquid chromatograph detection, characterized by: The utility model provides an improved sample injection device, which comprises a sample injection box (1) provided with a sample injection disc (2) having a plurality of sample tubes (3), a first driving structure for driving the sample injection disc (2) to move, a rotating disc (4) arranged inside the sample injection box (1), a second driving structure for driving the rotating disc (4) to move, a connecting plate (5) arranged on one side of the rotating disc (4), an adjusting structure for adjusting the position of the connecting plate (5), two limiting plates (6) fixedly arranged on one side of the connecting plate (5), an installation block (7) arranged between the two limiting plates (6), a limiting block (10) arranged on the limiting plate (6), a limiting groove (11) formed in the installation block (7), a moving structure arranged on the limiting plate (6) and used for inserting the limiting block (10) into the limiting groove (11), a sample tube (8) fixedly arranged on one side of the installation block (7), a protective plate (9) arranged on the installation block (7), and a pushing structure arranged on the installation block (7) and used for pushing the protective plate (9); and a sample inlet (12) is arranged inside the sample injection box (1). The moving structure comprises a protruding block (1061), a sliding groove (1062), a guide groove (1063), a sliding block (1064), a guide block (1065), a second spring (1066), and a handle (1067). The protruding block (1061) is fixedly arranged on the limiting plate (6). The sliding groove (1062) is formed in the limiting plate (6) and extends into the interior of the protruding block (1061). The sliding block (1064) is slidingly arranged in the sliding groove (1062). The guide groove (1063) is formed in the limiting plate (6) and communicates with the sliding groove (1062). The guide block (1065) is slidingly arranged in the guide groove (1063). The limiting block (10) is fixedly connected with the guide block (1065). The limiting block (10) can extend to the outside of the limiting plate (6) and be inserted into the limiting groove (11). One end of the sliding block (1064) extends into the guide groove (1063) and is fixedly connected with the guide block (1065). The handle (1067) is fixedly arranged on the side of the sliding block (1064) away from the guide block (1065). One end of the handle (1067) extends to the outside of the limiting plate (6). The second spring (1066) is arranged between the sliding groove (1062) and the sliding block (1064). The two ends of the second spring (1066) are fixedly connected with the sliding block (1064) and the inner wall of the sliding groove (1062), respectively. A first assembly groove (1071) is formed in the limiting plate (6) and communicates with the guide groove (1063), a second assembly groove (1072) is formed in the guide block (1065), and an assembly plate (1073) is fixedly arranged on the protective plate (9) and extends to the outside of the mounting block (7) and can be inserted into the first assembly groove (1071) and the second assembly groove (1072); The pushing structure comprises a receiving groove (1051), a positioning groove (1052), a positioning block (1053), an inner groove (1054), a pushing plate (1055), a fixing groove (1056) and a first spring (1057). The receiving groove (1051) is formed in the mounting block (7), the protective plate (9) is slidingly arranged in the receiving groove (1051), the positioning groove (1052) is formed in the mounting block (7) and communicates with the receiving groove (1051), the positioning block (1053) is slidingly arranged in the positioning groove (1052), one side of the positioning block (1053) extends to the inside of the receiving groove (1051) and is fixedly connected with the protective plate (9), the inner groove (1054) is formed in the positioning block (1053), the pushing plate (1055) is slidingly arranged in the inner groove (1054), one end of the pushing plate (1055) away from the positioning block (1053) extends to the outside of the mounting block (7), the fixing groove (1056) is formed in the mounting block (7) and communicates with the positioning groove (1052), the pushing plate (1055) can abut against the fixing groove (1056), and the first spring (1057) is arranged between the positioning block (1053) and the positioning groove (1052) and is fixedly connected with the inner walls of the positioning block (1053) and the positioning groove (1052) at both ends.

2. The sample injection device for liquid chromatography detection of claim 1, wherein: The first driving structure comprises a first placing groove (1011), a first motor (1012) and a first rotating shaft (1013). The first placing groove (1011) is formed in the sample feeding box (1), the first motor (1012) is fixedly arranged in the first placing groove (1011), the first rotating shaft (1013) is power-connected with the first motor (1012), and one end of the first rotating shaft (1013) extends to the outside of the sample feeding box (1) and is fixedly connected with the sample feeding disc (2).

3. The sample injection device for liquid chromatography detection of claim 1, wherein: The second driving structure comprises a second placing groove (1021), a second motor (1022) and a second rotating shaft (1023). The second placing groove (1021) is formed in the sample feeding box (1), the second motor (1022) is fixedly arranged in the second placing groove (1021), the second rotating shaft (1023) is power-connected with the second motor (1022), and one end of the second rotating shaft (1023) extends to the inside of the sample feeding box (1) and is fixedly connected with the rotating disc (4).

4. The sample injection device for use in liquid chromatography according to claim 1, wherein: The adjusting structure comprises a third motor (1031), a threaded rod (1032), a sample inlet groove (1033), a disc (1034) and an extension rod (1035), the third motor (1031) is fixedly arranged on the rotating disc (4), the threaded rod (1032) is in power connection with the third motor (1031), the threaded rod (1032) is in threaded connection with the connecting plate (5), the sample inlet groove (1033) is arranged on the inner wall of the sample inlet box (1), the disc (1034) is slidably arranged in the sample inlet groove (1033), the threaded rod (1032) extends to the inside of the sample inlet groove (1033) and is in rotary connection with the disc (1034) at the end away from the third motor (1031), and the extension rod (1035) is fixedly arranged on the rotating disc (4), and the extension rod (1035) is in fixed connection with the connecting plate (5) at the extension end.

5. The sample injection device for use in liquid chromatography according to claim 1, wherein: The mounting groove (1041) is arranged on the mounting block (7), the electric push rod (1042) is fixedly arranged in the mounting groove (1041), and the output end of the electric push rod (1042) extends to the inside of the sampling pipe (8) and is fixedly provided with the piston (1043).

6. The sample injection device for use in liquid chromatography detection of claim 1, wherein: The sample disc (2) is provided with a sample groove (1081), the sample tube (3) is arranged in the sample groove (1081), the sample disc (2) is further provided with a connecting groove (1082) in communication with the sample groove (1081), the push rod (1083) is slidably arranged in the connecting groove (1082), one end of the push rod (1083) extends to the inside of the sample groove (1081) and is fixedly provided with the tray (1084), the sample tube (3) can abut against the tray (1084), and the other end of the push rod (1083) extends to the outside of the sample disc (2).

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