Sample injection device and method for liquid chromatograph detection

Abstract

The invention discloses a sample injection device and method for liquid chromatograph detection, and belongs to the technical field of chromatographic instruments. 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 rotating disc is arranged in 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, and 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 pipe is fixedly arranged on one side of the mounting block, a protection plate is arranged on the mounting block, and a sample injection opening is formed in the sample injection box. When sample injection is not needed, the protective plate is used for protecting the sampling tube, and the protective plate can preferably bear collision force when the sampling tube is accidentally collided with the outside, so that the sampling tube is prevented from being in contact with an external object, the risks of deformation and breakage of the sampling tube caused by collision are reduced, and the service life of the device is prolonged.

Description

Technical Field

[0001] This invention relates to an injection device and method for detection in a liquid chromatograph, belonging to the field of chromatograph technology. Background Technology

[0002] In the field of liquid chromatography (LC) detection technology, the injection device is a crucial link in sample detection, and its stability and reliability directly affect the accuracy of the detection results and the service life of the equipment. During the injection process of an LC instrument, the sampling tube, as the core component that directly contacts the sample, usually requires frequent sampling and pipetting operations. However, existing sampling tubes, when not in use, are exposed to the external environment for extended periods, making them susceptible to accidental impacts such as collisions and accidental contact, leading to problems such as deformation and breakage, thus reducing their service life. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sample injection device and method for detection in liquid chromatography, which solves the problem in the prior art that when the sampling tube is not in operation, it is exposed to the external environment for a long time and is easily subjected to external collisions, accidental touches and other accidental impacts, which leads to deformation and breakage of the sampling tube and reduces its service life.

[0004] The technical problem to be solved by the present invention is achieved by the following technical solution: a sample injection device and method for detection in a liquid chromatograph, comprising a sample injection chamber, a sample injection plate on the sample injection chamber, a plurality of sample tubes on the sample injection plate, a first driving structure for driving the sample injection plate to move on the sample injection chamber, a rotating disk inside the sample injection chamber, a second driving structure for driving the rotating disk to move on the sample injection chamber, a connecting plate on one side of the rotating disk, an adjusting structure for adjusting the position of the connecting plate on the rotating disk, two limiting plates fixedly mounted on one side of the connecting plate, an installation block between the two limiting plates, a limiting block on the limiting plate, a limiting groove on the installation block, a moving structure for pushing the limiting block to insert into the limiting groove on the limiting plate, a sampling tube fixedly mounted on one side of the installation block, a protective plate on the installation block, a pushing structure for pushing the protective plate on the installation block, and a sample inlet inside the sample injection chamber.

[0005] By adopting the above technical solution, when no sample is needed, the sampling tube is protected by the protective plate. When subjected to accidental external impact, the protective plate can preferentially withstand the impact force, preventing the sampling tube from contacting external objects. This reduces the risk of deformation and breakage of the sampling tube due to impact, and improves the service life of the device.

[0006] The present invention is further configured such that: the first driving structure includes a first placement slot, a first motor and a first rotating shaft, the first placement slot is formed on the sample injection box, the first motor is fixedly disposed inside the first placement slot, the first rotating shaft is poweredly connected to the first motor, and one end of the first rotating shaft extends to the outside of the sample injection box and is fixedly connected to the sample injection plate.

[0007] The present invention is further configured such that: the second driving structure includes a second placement slot, a second motor and a second rotating shaft, the second placement slot is opened on the sample injection box, the second motor is fixedly installed inside the second placement slot, the second rotating shaft is poweredly connected to the second motor, and one end of the second rotating shaft extends into the interior of the sample injection box and is fixedly connected to the rotating disk.

[0008] The invention is further configured such that: the adjustment structure includes a third motor, a threaded rod, a sample inlet, a disc, and a telescopic rod; the third motor is fixedly mounted on the rotating disc; the threaded rod is poweredly connected to the third motor and threadedly connected to the connecting plate; the sample inlet is opened on the inner wall of the sample inlet box; the disc is slidably mounted inside the sample inlet; one end of the threaded rod away from the third motor extends into the sample inlet and is rotatably connected to the disc; the telescopic rod is fixedly mounted on the rotating disc; and the telescopic end of the telescopic rod is fixedly connected to the connecting plate.

[0009] The invention is further configured such that: a mounting groove is provided on the mounting block, an electric push rod is fixedly installed inside the mounting groove, and the output end of the electric push rod extends into the interior of the sampling tube and is fixedly installed with a piston.

[0010] The invention is further configured such that: the pushing structure includes a storage groove, a positioning groove, a positioning block, an inner groove, a lever, a fixing groove, and a first spring; the storage groove is formed on the mounting block; the protective plate is slidably disposed inside the storage groove; the positioning groove is formed on the mounting block and communicates with the storage groove; the positioning block is slidably disposed inside the positioning groove; one side of the positioning block extends into the storage groove and is fixedly connected to the protective plate; the inner groove is formed on the positioning block; the lever is slidably disposed inside the inner groove; one end of the lever away from the positioning block extends to the outside of the mounting block; the fixing groove is formed on the mounting block and communicates with the positioning groove; the lever can abut against the fixing groove; the first spring is disposed between the positioning block and the positioning groove; and both ends of the first spring are fixedly connected to the inner walls of the positioning block and the positioning groove, respectively.

[0011] By adopting the above technical solution, the positioning block is slid in the positioning groove by pushing the dial plate, so that the positioning block moves the protective plate in the receiving groove toward the sampling tube. During the movement, the positioning block gradually compresses the first spring. When the protective plate moves to the appropriate position, the dial plate is flush with the fixing groove. At this time, the dial plate is pushed to slide in the inner groove, so that the dial plate moves into the inside of the fixing groove, thereby limiting the position of the protective plate.

[0012] The invention is further configured such that the movable structure includes a protrusion, a sliding groove, a guide groove, a sliding block, a guide block, a second spring, and a handle. The protrusion is fixedly mounted on a limiting plate. The sliding groove is formed on the limiting plate and extends into the interior of the protrusion. The sliding block is slidably mounted inside the sliding groove. The guide groove is formed on the limiting plate and communicates with the sliding groove. The guide block is slidably mounted inside the guide groove. The limiting block is fixedly connected to the guide block. The limiting block can extend to the outside of the limiting plate and insert into the limiting groove. One end of the sliding block extends into the interior of the guide groove and is fixedly connected to the guide block. The handle is fixedly mounted 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. The second spring is disposed between the sliding groove and the sliding block. The two ends of the second spring are fixedly connected to the inner walls of the sliding block and the sliding groove, respectively.

[0013] The present invention is further configured such that: a first assembly groove communicating with a guide groove is provided on the limiting plate, a second assembly groove is provided on the guide block, and an assembly plate is fixedly provided on the protective plate, one end of the assembly plate extending to the outside of the mounting block and being able to be inserted into the first assembly groove and the second assembly groove.

[0014] By adopting the above technical solution, the protective plate synchronously drives the assembly plate to move away from the second assembly groove in the first assembly groove during the movement, realizing the separation of the assembly plate and the second assembly groove from the first assembly groove. At this time, the limiting of the guide block can be cancelled. Then, pulling the handle drives the sliding block to slide in the sliding groove, so that the sliding block synchronously drives the guide block to slide in the guide groove. During the sliding process, the sliding block compresses the second spring. At this time, the guide block drives the limiting block to move away from the limiting groove, realizing the separation of the limiting block from the limiting groove, thereby cancelling the limiting of the limiting plate and the mounting block. Then the mounting block can be disassembled, thus completing the disassembly of the sampling tube. By being able to remove the sampling tube, it is convenient for the staff to maintain and care for the sampling tube. By removing the sampling tube under the protection of the protective plate, it is effective to prevent accidental collisions or accidental contact from the outside, avoiding damage to the sampling tube due to accidental contact during the disassembly operation, and further improving the safety performance of the device.

[0015] The present invention is further configured such that: a sample slot is provided on the sample injection plate, a sample tube is placed inside the sample slot, and a connecting slot communicating with the sample slot is also provided on the sample injection plate. A push rod is slidably arranged inside the connecting slot. One end of the push rod extends into the sample slot and a tray is fixedly arranged thereon. The sample tube can abut against the tray. The other end of the push rod extends to the outside of the sample injection plate.

[0016] An injection method for an injection device used in liquid chromatography detection, the injection method comprising: S1: First, place the sample tube on the sample inlet tray; S2: The first driving structure drives the injection disk to rotate, causing the injection disk to move the sample tube to below the sampling tube; S3: The connecting plate is moved by adjusting the structure, so that the connecting plate can drive the sampling tube to be inserted into the sample tube for sampling; S4: After sampling is completed, the connecting plate is moved away from the sample tube by adjusting the structure again, so that the connecting plate can separate the sampling tube from the sample tube. S5: The second drive structure drives the rotating disk to rotate, and the rotating disk drives the connecting plate and the sampling tube to rotate during the rotation, so that the sampling tube is aligned with the inlet. S6: The connecting plate is moved by adjusting the structure, so that the connecting plate can drive the sampling tube to be inserted into the sample inlet and transport the sample into the sample inlet; S7: After the injection is completed, the connecting plate is moved away from the injection port by adjusting the structure again, so that the connecting plate drives the sampling tube to separate from the injection port; S8: The second drive structure drives the rotating disk to rotate. During the rotation of the rotating disk, the connecting plate and the sampling tube rotate, so that the sampling tube is aligned with the sample tube, and the sample injection can be completed.

[0017] The beneficial effects of this invention are: when no sample is needed, the sampling tube is protected by a protective plate. In the event of an accidental external impact, the protective plate can preferentially withstand the impact force, preventing the sampling tube from contacting external objects. This reduces the risk of deformation and breakage of the sampling tube due to impact. Furthermore, by removing the sampling tube under the protection of the protective plate, accidental external impacts or accidental contact are effectively prevented, avoiding damage to the sampling tube due to accidental contact during disassembly. This further improves the safety performance of the device and extends its service life. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic cross-sectional view of the mounting block in this invention; Figure 6 This is a schematic diagram of the exploded structure of the present invention; Figure 7 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 8 This is a three-dimensional structural diagram of the present invention; Figure 9 For the present invention Figure 8Enlarged diagram of point A in the middle.

[0019] In the diagram: 1. Sample inlet box; 2. Sample inlet tray; 3. Sample tube; 4. Rotating disk; 5. Connecting plate; 6. Limiting plate; 7. Mounting block; 8. Sampling tube; 9. Protective plate; 10. Limiting block; 11. Limiting groove; 12. Sample inlet; 1011. First placement slot; 1012. First motor; 1013. First rotating shaft; 1021. Second placement slot; 1022. Second motor; 1023. Second rotating shaft; 1031. Third motor; 1032. Threaded rod; 1033. Sample inlet slot; 1034. Disc; 1035. Telescopic rod; 1041. Mounting slot; 1042. Electric... 1043. Push rod; 1051. Piston; 1052. Storage slot; 1053. Positioning slot; 1054. Positioning block; 1055. Inner groove; 1056. Paddle plate; 1057. Fixing groove; 1061. First spring; 1062. Protrusion; 1063. Sliding groove; 1064. Guide groove; 1065. Sliding block; 1066. Guide block; 1067. Second spring; 1068. Handle; 1071. First assembly slot; 1072. Second assembly slot; 1073. Assembly plate; 1081. Sample slot; 1082. Connecting slot; 1083. Push rod; 1084. Tray. Detailed Implementation

[0020] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific illustrations.

[0021] like Figures 1 to 4 As shown, a sample injection device and method for detection in a liquid chromatograph includes a sample injection chamber 1 connected to an external chromatograph. The sample injection chamber 1 has a sample injection disk 2 with several sample tubes 3. A first driving structure for moving the sample injection disk 2 is also provided on the sample injection chamber 1. A rotating disk 4 is located inside the sample injection chamber 1, and a second driving structure for moving the rotating disk 4 is also provided on the sample injection chamber 1. A connecting plate 5 is located on one side of the rotating disk 4, and an adjustment structure for adjusting the position of the connecting plate 5 is provided on the rotating disk 4. Two limiting plates 6 are fixedly installed on one side of the connecting plate 5. An installation block 7 is provided between the two limiting plates 6. Each of the two limiting plates 6 is provided with a limiting block 10. A limiting groove 11 is provided on the installation block 7. The limiting plates 6 are respectively provided with a moving structure for pushing the limiting block 10 and the limiting groove 11 to insert into each other. A sampling tube 8 is fixedly provided on one side of the installation block 7. A protective plate 9 is provided on the installation block 7. There are two protective plates 9. The protective plates 9 are used to protect the sampling tube 8. The installation block 7 is also provided with a pushing structure for pushing the protective plate 9. The pushing structure corresponds to the protective plate 9. An injection port 12 is provided inside the injection box 1. The injection port 12 is connected to the injection tube on the external chromatograph.

[0022] like Figure 2 As shown, the first drive structure includes a first placement slot 1011, a first motor 1012 and a first rotating shaft 1013. The first placement slot 1011 is vertically opened on the sample injection box 1. The first motor 1012 is fixedly installed inside the first placement slot 1011. The first rotating shaft 1013 is poweredly connected to the first motor 1012. One end of the first rotating shaft 1013 extends to the outside of the sample injection box 1 and is fixedly connected to the sample injection plate 2.

[0023] like Figure 2 As shown, the second drive structure includes a second placement slot 1021, a second motor 1022, and a second rotating shaft 1023. The second placement slot 1021 is vertically opened on the sample injection box 1. The second motor 1022 is fixedly installed inside the second placement slot 1021. The second rotating shaft 1023 is poweredly connected to the second motor 1022. One end of the second rotating shaft 1023 extends into the interior of the sample injection box 1 and is fixedly connected to the rotating disk 4.

[0024] like Figure 2 As shown, the adjustment structure includes a third motor 1031, a threaded rod 1032, a sample inlet 1033, a disc 1034, and a telescopic rod 1035. The third motor 1031 is fixedly mounted on the rotating disc 4. The threaded rod 1032 is poweredly connected to the third motor 1031 and threadedly connected to the connecting plate 5. The sample inlet 1033 is located on the inner wall of the sample inlet box 1. The sample inlet 1033 is circular and has the same center as the rotating disc 4. The disc 1034 is slidably mounted inside the sample inlet 1033. The threaded rod 1032... One end of the motor 1031 extends into the sample inlet 1033 and is rotatably connected to the disc 1034. A telescopic rod 1035 is fixedly mounted on the rotating disc 4. The telescopic rod 1035 is fixedly connected to the connecting plate 5. The telescopic rod 1035 is divided into two sections, each fixedly connected to the rotating disc 4 and the connecting plate 5 respectively. The telescopic end of the telescopic rod 1035 is fixedly mounted to the connecting plate 5. When the connecting plate 5 moves, the telescopic rod 1035 moves synchronously, thus limiting and guiding the connecting plate 5 and preventing deviation. The first motor 1012, the second motor 1022, and the third motor 1031 are connected to an external power source, which provides power to them.

[0025] like Figure 5 and Figure 6 As shown, the mounting block 7 has a mounting groove 1041, which is vertically opened. An electric push rod 1042 is fixedly installed inside the mounting groove 1041. The electric push rod 1042 is connected to an external power source, which provides power to the electric push rod 1042. The output end of the electric push rod 1042 extends into the interior of the sampling tube 8 and is fixedly installed with a piston 1043. The piston 1043 is slidably connected to the interior of the sampling tube 8.

[0026] like Figure 6 As shown, the pushing structure includes a storage groove 1051, a positioning groove 1052, a positioning block 1053, an inner groove 1054, a lever 1055, a fixing groove 1056, and a first spring 1057. The storage groove 1051 is formed on the mounting block 7, and the opening direction of the storage groove 1051 is the same as the opening direction of the mounting groove 1054. The protective plate 9 is slidably disposed inside the storage groove 1051, and the protective plate 9 slides along the opening direction of the storage groove 1051. The positioning groove 1052 is formed on the mounting block 7 and communicates with the storage groove 1051. The opening direction of the positioning groove 1052 is the same as the opening direction of the storage groove 1051. The positioning block 1053 is slidably disposed inside the positioning groove 1052. One side of the positioning block 1053 extends into the interior of the storage groove 1051 and is fixedly connected to the protective plate 9. When the positioning block 1053 moves, it synchronously drives the protective plate 9 to move. The inner groove 1054... 4. A horizontally opened position block 1053 is provided. A lever 1055 is slidably disposed inside the inner groove 1054. One end of the lever 1055 away from the position block 1053 extends to the outside of the mounting block 7. A fixing groove 1056 is opened on the mounting block 7 and communicates with the positioning groove 1052. The lever 1055 can abut against the fixing groove 1056. The lever 1055 can move along the opening direction of the inner groove 1054 and abut against the fixing groove 1056. A first spring 1057 is disposed between the position block 1053 and the positioning groove 1052. The two ends of the first spring 1057 are fixedly connected to the inner walls of the position block 1053 and the positioning groove 1052, respectively. When the first spring 1057 is not under force, it is in a tensioned state. At this time, the protective plate 9 is located inside the storage groove 1051. When the first spring 1057 is under force, it is in a compressed state. At this time, one end of the protective plate 9 extends to the outside of the storage groove 1051.

[0027] like Figures 5 to 7As shown, the movable structure includes a protrusion 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 protrusion 1061 is fixedly disposed on the limiting plate 6 on the side away from the mounting block 7. The sliding groove 1062 is horizontally opened on the limiting plate 6 and extends into the interior of the protrusion 1061. The sliding block 1064 is slidably disposed inside the sliding groove 1062 and slides along the opening direction of the sliding groove 1062. The guide groove 1063 is opened on the limiting plate 6 and communicates with the sliding groove 1062. The guide groove 1063 is a one-way opening. The guide block 1065 is slidably disposed inside the guide groove 1063. The limiting block 10 is fixedly connected to the guide block 1065. The guide block 1065 moves synchronously with the sliding block 1064. The limiting block 10 moves away from the guide block 1065. One end of the guide block 1065 can extend to the outside of the limiting plate 6 and be inserted into the limiting groove 11. The 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 into the inside of the guide groove 1063 and is fixedly connected to the guide block 1065. The handle 1067 is fixedly set 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 set between the sliding groove 1062 and the sliding block 1064. The two ends of the second spring 1066 are fixedly connected to the inner walls of the sliding block 1064 and the sliding groove 1062, respectively. When the second spring 1066 is not under force, it is in a tensioned state. At this time, the limiting block 10 and the limiting groove 11 are in an inserted state. When the second spring 1066 is under force, it is in a compressed state. At this time, the limiting block 10 and the limiting groove 11 are in a separated state.

[0028] like Figure 6 As shown, the limiting plate 6 has a first assembly groove 1071 vertically opened and communicating with the guide groove 1063, and the guide block 1065 has a second assembly groove 1072 opened. When the limiting block 10 and the limiting groove 11 are in the insertion state, the first assembly groove 1071 and the second assembly groove 1072 are aligned. The protective plate 9 is fixedly provided with an assembly plate 1073. 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.

[0029] like Figure 8 and Figure 9As shown, the sample inlet disk 2 has a sample slot 1081, and there are several sample slots 1081 arranged in a circumferential array along the circumference of the sample inlet disk 2. The sample tube 3 is placed inside the sample slot 1081. The sample inlet disk 2 also has a connecting groove 1082 that communicates with the sample slot 1081. A push rod 1083 is slidably arranged inside the connecting groove 1082. One end of the push rod 1083 extends into the interior of the sample slot 1081 and is fixedly mounted on 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 inlet disk 2.

[0030] When no sample is needed, the positioning block 1053 is slid in the positioning groove 1052 by pushing the lever 1055. This causes the positioning block 1053 to move the protective plate 9 in the receiving groove 1051 toward the sampling tube 8. During the movement, the positioning block 1053 gradually compresses the first spring 1057. When the protective plate 9 moves to the appropriate position, the lever 1055 is flush with the fixing groove 1056. At this time, the lever 1055 is pushed to slide in the inner groove 1054, moving the lever 1055 into the fixing groove 1056, thus limiting the position of the protective plate 9. The protective plate 9 protects the sampling tube 8. In the event of an accidental external collision, the protective plate 9 can preferentially withstand the impact force, preventing the sampling tube 8 from contacting external objects. This reduces the risk of deformation and breakage of the sampling tube 8 due to collision, and improves the service life of the device.

[0031] During the movement of the protective plate 9, the assembly plate 1073 is simultaneously moved away from the second assembly groove 1072 within the first assembly groove 1071, thus separating the assembly plate 1073 and the second assembly groove 1072 from the first assembly groove 1071. At this point, the limiting position on the guide block 1065 can be released. Pulling the handle 1067 then causes the sliding block 1064 to slide within the sliding groove 1062, simultaneously causing the sliding block 1064 to move the guide block 1065 within the guide groove 1063. During the sliding process, the sliding block 1064 compresses the second spring 1066. At this time, the guide block... 1065 drives the limiting block 10 to move away from the limiting groove 11, thereby separating the limiting block 10 from the limiting groove 11 and canceling the limiting of the limiting plate 6 and the mounting block 7. Then the mounting block 7 can be disassembled to complete the disassembly of the sampling tube 8. The ability to disassemble the sampling tube 8 makes it convenient for staff to maintain and care for it. By disassembling the sampling tube 8 under the protection of the protective plate 9, the external accidental collision or accidental contact is effectively blocked, and the sampling tube 8 is prevented from being damaged due to accidental contact during the disassembly operation, further improving the safety performance of the device.

[0032] When installing the sampling tube 8, first pull the handle 1067 to move the sliding block 1064 in the sliding groove 1062, so that the sliding block 1064 simultaneously moves the guide block 1065 in the guide groove 1063. During the sliding process, the sliding block 1064 compresses the second spring 1066. At this time, the guide block 1065 moves the limiting block 10, so that the limiting block 10 retracts into the guide groove 1063. Then, the mounting block 7 abuts against the limiting plate 6. At this time, by releasing the handle 1067, the second spring 1066 resets and pushes the sliding block 1064 to slide in the sliding groove 1062, so that the sliding block 1064 moves the guide block 1065 in the guide groove 1063. During the movement, the guide block 1065 simultaneously moves the limiting block 10 towards the limiting groove 11, so that the limiting block 10 is inserted into the limiting groove 11, thus completing the connection between the limiting plate 6 and the mounting block 7.

[0033] When sample injection is required, push the lever 1055 to move away from the fixed groove 1056 within the inner groove 1054, thus releasing the contact limit between the lever 1055 and the fixed groove 1056. At this time, the first spring 1057 resets and pushes the positioning block 1053 to slide within the positioning groove 1052. During the movement, the positioning block 1053 simultaneously drives the protective plate 9 to slide into the receiving groove 1051, so that the protective plate 9 is stored inside the receiving groove 1051, thereby removing the protection of the sampling tube 8. During the movement of plate 9, the assembly plate 1073 is moved synchronously towards the first assembly groove 1071, so that the assembly plate 1073 passes through the first assembly groove 1071 and is inserted into the interior of the second assembly groove 1072, which limits the guide block 1065, thereby further limiting the position of the limiting block 10. This effectively prevents the sampling tube 8 from shaking or shifting due to component displacement during the sampling process, ensuring the accuracy of sampling and injection operations and improving the overall stability of the device.

[0034] When it is necessary to remove the sample tube 3, the push rod 1083 is pulled to move within the connecting groove 1082, causing the push rod 1083 to move the tray 1084. The tray 1084 then pushes the sample tube 3 away from the sample groove 1081, making it easier to remove the sample tube 3.

[0035] An injection method for an injection device used in liquid chromatography detection, the injection method comprising: S1: First, place the sample tube 3 to be tested into the sample slot 1081 on the sample tray 2; S2: The first motor 1012 in the first drive structure drives the first rotating shaft 1013 to rotate, which in turn drives the sample inlet disk 2 to rotate, and the sample inlet disk 2 drives the sample tube 3 to move below the sampling tube 8. S3: The third motor 1031 in the adjustment structure drives the threaded rod 1032 to rotate. Under the action of the threaded structure, the threaded rod 1032 drives the connecting plate 5 to move, so that the connecting plate 5 drives the sampling tube 8 to be inserted into the sample tube 3. Then, the electric push rod 1042 is started to drive the piston 1043 to slide inside the sampling tube 8. The piston 1043 changes the pressure difference inside the sampling tube 8 to draw the sample into the sampling tube 8 for sampling. S4: After sampling is completed, the third motor 1031 in the adjustment structure drives the threaded rod 1032 to rotate again. Under the action of the threaded structure, the threaded rod 1032 drives the connecting plate 5 to move, so that the connecting plate 5 drives the sampling tube 8 to move away from the sample tube 3, thereby causing the connecting plate 5 to separate the sampling tube 8 from the sample tube 3. S5: The second motor 1022 in the second drive structure drives the second rotating shaft 1023 to rotate, which in turn drives the rotating disk 4 to rotate. During the rotation of the rotating disk 4, 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. When the threaded rod 1032 moves, it drives the disc 1034 to slide along the inside of the sample inlet groove 1033. The sample inlet groove 1033 guides and limits the connecting plate 5 and the sampling tube 8, and then aligns the sampling tube 8 with the sample inlet 12. S6: The third motor 1031 in the adjustment structure drives the threaded rod 1032 to rotate. Under the action of the threaded structure, the threaded rod 1032 drives the connecting plate 5 to move, so that the connecting plate 5 drives the sampling tube 8 to be inserted into the sample inlet 12. The electric push rod 1042 is started to drive the piston 1043 to slide inside the sampling tube 8, and the sample is transported into the sample inlet 12. S7: After the injection is completed, the third motor 1031 in the adjustment structure drives the threaded rod 1032 to rotate again. Under the action of the threaded structure, the threaded rod 1032 drives the connecting plate 5 to move away from the injection port 12, thereby causing the connecting plate 5 to separate the sampling tube 8 from the injection port 12. S8: The second motor 1022 in the second drive structure drives the second rotating shaft 1023 to rotate, which in turn drives the rotating disk 4 to rotate. During the rotation of the rotating disk 4, 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. When the threaded rod 1032 moves, it drives the disc 1034 to slide along the inside of the sample inlet groove 1033, so that the sampling tube 8 is aligned with the sample tube 3, and the sample injection is completed.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sample injection device for detection in a liquid chromatograph, characterized in that: The system includes a sample inlet box (1), on which a sample inlet disc (2) is provided. Several sample tubes (3) are provided on the sample inlet disc (2). The sample inlet box (1) also has a first driving structure for driving the sample inlet disc (2) to move. A rotating disc (4) is located inside the sample inlet box (1). The sample inlet box (1) also has a second driving structure for driving the rotating disc (4) to move. A connecting plate (5) is provided on one side of the rotating disc (4). An adjustment structure for adjusting the position of the connecting plate (5) is provided on the rotating disc (4). Two... A limiting plate (6) is provided, and an installation block (7) is provided between the two limiting plates (6). A limiting block (10) is provided on the limiting plate (6), and a limiting groove (11) is provided on the installation block (7). A moving structure is provided on the limiting plate (6) to push the limiting block (10) and the limiting groove (11) to insert. A sampling tube (8) is fixedly provided on one side of the installation block (7). A protective plate (9) is provided on the installation block (7). A pushing structure for pushing the protective plate (9) is also provided on the installation block (7). An inlet (12) is provided inside the sample box (1).

2. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The first drive structure includes a first placement slot (1011), a first motor (1012) and a first rotating shaft (1013). The first placement slot (1011) is opened on the sample injection box (1). The first motor (1012) is fixedly installed inside the first placement slot (1011). The first rotating shaft (1013) is poweredly connected to the first motor (1012). One end of the first rotating shaft (1013) extends to the outside of the sample injection box (1) and is fixedly connected to the sample injection plate (2).

3. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The second drive structure includes a second placement slot (1021), a second motor (1022), and a second rotating shaft (1023). The second placement slot (1021) is opened on the sample injection box (1). The second motor (1022) is fixedly installed inside the second placement slot (1021). The second rotating shaft (1023) is poweredly connected to the second motor (1022). One end of the second rotating shaft (1023) extends into the sample injection box (1) and is fixedly connected to the rotating disk (4).

4. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The adjustment structure includes a third motor (1031), a threaded rod (1032), a sample inlet (1033), a disc (1034), and a telescopic rod (1035). The third motor (1031) is fixedly mounted on the rotating disc (4). The threaded rod (1032) is poweredly connected to the third motor (1031). The threaded rod (1032) is threadedly connected to the connecting plate (5). The sample inlet (1033) is opened on the inner wall of the sample inlet box (1). The disc (1034) is slidably mounted inside the sample inlet (1033). The end of the threaded rod (1032) away from the third motor (1031) extends into the sample inlet (1033) and is rotatably connected to the disc (1034). The telescopic rod (1035) is fixedly mounted on the rotating disc (4). The telescopic end of the telescopic rod (1035) is fixedly connected to the connecting plate (5).

5. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The mounting block (7) has a mounting groove (1041), and an electric push rod (1042) is fixedly installed inside the mounting groove (1041). The output end of the electric push rod (1042) extends into the sampling tube (8) and is fixedly installed with a piston (1043).

6. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The pushing structure includes a storage groove (1051), a positioning groove (1052), a positioning block (1053), an inner groove (1054), a lever (1055), a fixing groove (1056), and a first spring (1057). The storage groove (1051) is formed on the mounting block (7), and the protective plate (9) is slidably disposed inside the storage groove (1051). The positioning groove (1052) is formed on the mounting block (7) and communicates with the storage groove (1051). The positioning block (1053) is slidably disposed inside the positioning groove (1052), and one side of the positioning block (1053) extends into the interior of the storage groove (1051) and is fixedly connected to the protective plate (9). The inner groove (1054) is formed on the positioning block (1053), and the lever (1055) is slidably disposed inside the inner groove (1054). The end of the lever (1055) away from the positioning block (1053) extends to the outside of the mounting block (7). The fixing groove (1056) is formed on the mounting block (7) and communicates with the positioning groove (1052). The lever (1055) can abut against the fixing groove (1056). The first spring (1057) is disposed between the positioning block (1053) and the positioning groove (1052). The two ends of the first spring (1057) are fixedly connected to the inner walls of the positioning block (1053) and the positioning groove (1052), respectively.

7. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The movable structure includes a protrusion (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 protrusion (1061) is fixedly mounted on the limiting plate (6). The sliding groove (1062) is formed on the limiting plate (6) and extends into the interior of the protrusion (1061). The sliding block (1064) is slidably mounted inside the sliding groove (1062). The guide groove (1063) is formed on the limiting plate (6) and communicates with the sliding groove (1062). The guide block (1065) is slidably mounted inside the guide groove (1063). The limiting block (1067)... The limiting block (10) is fixedly connected to the guide block (1065), and 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 inside of the guide groove (1063) and is fixedly connected to the guide block (1065). The handle (1067) is fixedly disposed 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 disposed between the sliding groove (1062) and the sliding block (1064). The two ends of the second spring (1066) are fixedly connected to the inner walls of the sliding block (1064) and the sliding groove (1062), respectively.

8. The sample injection device for detection in a liquid chromatograph according to claim 7, characterized in that: The limiting plate (6) has a first assembly groove (1071) that communicates with the guide groove (1063), the guide block (1065) has a second assembly groove (1072), the protective plate (9) has an assembly plate (1073) fixedly installed, one end of the assembly plate (1073) extends to the outside of the mounting block (7) and can be inserted into the second assembly groove (1072) through the first assembly groove (1071).

9. The sample injection device for detection in a liquid chromatograph according to claim 1, characterized in that: The sample tray (2) is provided with a sample slot (1081), and the sample tube (3) is disposed inside the sample slot (1081). The sample tray (2) is also provided with a connecting slot (1082) that communicates with the sample slot (1081). A push rod (1083) is slidably disposed inside the connecting slot (1082). One end of the push rod (1083) extends into the sample slot (1081) and a tray (1084) is fixedly disposed thereon. 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).

10. The injection method of the injection device for liquid chromatography detection according to any one of claims 1-9, characterized in that: The injection method includes: S1: First, place the sample tube (3) on the sample tray (2); S2: The first driving structure drives the injection disk (2) to rotate, so that the injection disk (2) drives the sample tube (3) to move below the sampling tube (8); S3: By adjusting the structure, the connecting plate (5) is moved so that the connecting plate (5) drives the sampling tube (8) to be inserted into the sample tube (3) for sampling; S4: After sampling is completed, the connecting plate (5) is moved away from the sample tube (3) by adjusting the structure again, so that the connecting plate (5) drives the sampling tube (8) to separate from the sample tube (3); S5: The second drive structure drives the rotating disk (4) to rotate. During the rotation of the rotating disk (4), the connecting plate (5) and the sampling tube (8) rotate, so that the sampling tube (8) is aligned with the inlet (12). S6: By adjusting the structure, the connecting plate (5) is moved, so that the connecting plate (5) drives the sampling tube (8) to be inserted into the sample inlet (12) and the sample is transported into the sample inlet (12); S7: After the injection is completed, the connecting plate (5) is moved away from the injection port (12) by adjusting the structure again, so that the connecting plate (5) drives the sampling tube (8) to separate from the injection port (12); S8: The rotating disk (4) is driven to rotate by the second driving structure. During the rotation of the rotating disk (4), the connecting plate (5) and the sampling tube (8) are driven to rotate, so that the sampling tube (8) is aligned with the sample tube (3) and the sample can be injected.

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