Full-automatic intelligent calibration online oil chromatograph

Abstract

The invention discloses a full-automatic intelligent calibration on-line oil chromatograph, and relates to the chromatographic instrument detection technology, the full-automatic intelligent calibration on-line oil chromatograph comprises a chromatographic instrument body and a sample injection needle used for extracting a sample, a rotating disc is rotatably installed above the chromatographic instrument body, the rotating disc is provided with a sample injection driving assembly, and the sample injection needle is driven by the sample injection driving assembly to complete sample injection; after sample introduction is completed, the rotating disc is driven to rotate, so that the needle head of the sample introduction needle faces upwards, and gas is exhausted through the sample introduction driving assembly; the invention provides a full-automatic intelligent calibration on-line oil chromatograph which comprises a sample injection needle and a sample injection driving assembly for driving the sample injection needle to extract a sample, during sample injection, a needle head of the sample injection needle faces to be inserted into a sampling bottle for sampling, after sample injection is completed, a rotating disc is driven to rotate to enable the needle head of the sample injection needle to face upwards, and at the moment, the needle head of the sample injection needle faces upwards. And the gas in the sample injection needle is discharged upwards, so that the posture of the sample injection needle can be adjusted to simulate the condition of manual exhaust, and the air is prevented from being discharged into the chromatographic instrument to influence the analysis result.

Description

Technical Field

[0001] The invention relates to a chromatograph detection technology, in particular to a full-automatic intelligent calibration online oil chromatograph. Background Art

[0002] Oil chromatograph is an important device for analyzing dissolved gases in oil. By analyzing the types and contents of dissolved gases in oil, it can effectively monitor the operating status of equipment such as transformers and detect potential faults in a timely manner. Traditional oil chromatography analysis methods mainly rely on manual operation for sampling, which has problems such as cumbersome operation, high error and low efficiency. In the existing technology, automatic samplers have been mostly used for sampling. The existing automatic samplers can accurately control the sampling parameters, thereby improving the accuracy and convenience of repeated operations.

[0003] For example, the patent with the authorization announcement number CN116429961B and the authorization announcement date November 7, 2023, and the name of the patent is an oil chromatography analysis instrument and its detection method. Specifically, it relates to an oil chromatography analysis instrument and its detection method. The problem solved by the present invention is: the problem of insufficient positioning accuracy of the oil chromatography analysis instrument during automatic sampling. In order to solve the above problem, an embodiment of the present invention provides an oil chromatography analysis instrument, and the analysis instrument includes: an analysis device, and the analysis device is provided with an injection port; a placement device, and the placement device is arranged on the side of the analysis device close to the injection port, and the placement device includes a lifting rod and a rotating table, and the lifting rod is connected to the rotating table in a cooperative manner. The lifting rod can drive the rotating table to move up and down and change the distance between the rotating table and the injection port, a pushing device, and the pushing device is fixedly connected to the rotating table, and an injection device, and the injection device is arranged above the rotating table, and at least part of the injection device can move toward the injection port.

[0004] Another example is the patent with the authorization announcement number CN112858544B, the authorization announcement date is October 15, 2024, and the name is a patent for an automatic sampler for gas chromatography analysis, which relates to the technical field of experimental auxiliary equipment, including a sample injection box, a human-machine interaction module and a control module are arranged on the sample injection box, an X-axis moving component is arranged at the bottom of the sample injection box, a sample tray is arranged on the X-axis moving component, a sampling device is arranged directly above the sample tray, the sampling device is connected to a Y-axis moving component arranged inside the sample injection box, the sampling device includes a Z-axis moving component, a grabbing component, a sampling needle and a conveying flow path, the conveying flow path is connected to an extraction component, and the extraction component includes a sampling flow path, a sampling flow path, a quantitative flow path and a valve group; a photoelectric encoder is arranged on the X-axis moving component, the Y-axis moving component and the Z-axis moving component; an elastic component is arranged between the grabbing component and the Z-axis moving component. The present invention has the advantages of realizing automatic and reliable sampling, high accuracy and high stability.

[0005] The disadvantage of the prior art is that when an automatic sampler is used for injection, the needle of the injection needle always points downward, and the posture of the injection needle cannot be adjusted to simulate artificial exhaust. If air is inhaled and discharged into the chromatograph during injection, it may affect the analysis results. Summary of the invention

[0006] The object of the present invention is to provide a fully automatic intelligent calibration online oil chromatograph to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A fully automatic intelligent calibration online oil chromatograph comprises a chromatograph body and a sampling needle for extracting samples, a rotating disk is rotatably mounted above the chromatograph body, a sampling drive assembly is arranged on the rotating disk, and the sampling needle is driven by the sampling drive assembly to complete the sampling;

[0009] When the injection is completed, the rotating disk is driven to rotate so that the injection needle tip faces upward and the gas is exhausted through the injection drive assembly.

[0010] The above-mentioned fully automatic intelligent calibration online oil chromatograph has a mounting side plate fixed on the upper end of the chromatograph body, and multiple fixed shafts are fixed on the mounting side plate. Limit rollers are rotatably mounted on the fixed shafts. The multiple limit rollers are on the same virtual circle and are used to limit the rotation of the rotating disk. A circular hole is also opened on the mounting side plate, and the center of the circular hole coincides with the center of the rotating disk.

[0011] The above-mentioned fully automatic intelligent calibration online oil chromatograph has an automatic sample changer rotatably mounted on the upper end surface of the chromatograph body, and a sample injection bottle is arranged on the automatic sample changer, and the automatic sample changer is used to move the required sample injection bottle to just below the injection needle.

[0012] The above-mentioned fully automatic intelligent calibration online oil chromatograph, the injection drive assembly includes a through groove opened on the rotating disk, a connecting block is slidably installed in the through groove, a mounting plate is fixed at the front end of the connecting block, and an injection needle is detachably installed on the mounting plate.

[0013] In the above-mentioned fully automatic intelligent calibration online oil chromatograph, a mounting bracket is fixed to the upper end of the mounting plate, an electric push rod is installed on the mounting bracket, and the movable end of the electric push rod is connected to the push rod of the injection needle in a detachable manner.

[0014] In the above-mentioned fully automatic intelligent calibration online oil chromatograph, a driving block is formed at the rear end of the connecting block, a first servo motor is installed at the rear end of the rotating disk, a first lead screw is connected to the output shaft of the first servo motor, and the first lead screw is threaded through the driving block.

[0015] In the above-mentioned fully automatic intelligent calibration online oil chromatograph, an inner gear ring is fixed on the rear end of the rotating disk, a second servo motor is installed on the mounting side plate, a driving gear is connected to the output shaft of the second servo motor, and the driving gear and the inner gear ring are meshed with each other.

[0016] In the above-mentioned fully automatic intelligent calibration online oil chromatograph, a stop block is formed at the front end of the fixed shaft, and the stop block is attached to the front end of the rotating disk to prevent the rotating disk from falling out.

[0017] In the above-mentioned fully automatic intelligent calibration online oil chromatograph, a placer is fixed on the top of the mounting side plate, an exhaust bottle is clamped in the placer, and the exhaust bottle is used to exhaust the injection needle.

[0018] The above-mentioned fully automatic intelligent calibration online oil chromatograph, the injection needle has two working modes, namely, injection mode and exhaust mode;

[0019] In the injection mode, the injection needle is inserted downward into the injection bottle for injection;

[0020] In exhaust mode, the injection needle is inserted upward into the exhaust bottle to exhaust.

[0021] In the above technical scheme, the present invention provides a fully automatic intelligent calibration online oil chromatograph, including an injection needle and an injection drive assembly that drives the injection needle to extract samples. During injection, the injection needle is oriented to be inserted into a sampling bottle for sampling. After the injection is completed, the rotating disk is driven to rotate so that the injection needle is facing upward. At this time, the gas in the injection needle is discharged upward through the injection drive assembly. In this way, the posture of the injection needle can be adjusted to simulate the situation of artificial exhaust, thereby avoiding the influence of air discharge into the chromatograph on the analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a fully automatic intelligent calibration online oil chromatograph from a first perspective provided by an embodiment of the present invention.

[0024] Figure 2 For the present invention Figure 1 A local enlarged view of point X.

[0025] Figure 3 A schematic diagram of the three-dimensional structure of a fully automatic intelligent calibration online oil chromatograph from a second perspective provided by an embodiment of the present invention.

[0026] Figure 4 A partial front view of a pressure welding mechanism provided in another embodiment of the present invention.

[0027] Figure 5 A partial three-dimensional structural schematic diagram of a pressure welding mechanism from a first perspective provided in yet another embodiment of the present invention.

[0028] Figure 6 For the present invention Figure 5 A partial enlarged view of point Y.

[0029] Figure 7 A partial three-dimensional structural schematic diagram of a pressure welding mechanism from a second perspective provided in yet another embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Chromatograph body; 11. Mounting side plate; 12. Fixed shaft; 13. Limit roller; 14. Round hole; 15. Stopper; 16. Automatic sample changer; 17. Round turntable; 171. Fan-shaped opening; 18. Placer; 19. Exhaust bottle; 2. Injection needle; 3. Rotating disk; 31. Internal gear ring; 32. Second servo motor; 33. Driving gear; 4. Injection drive assembly; 41. Through slot; 43. Mounting plate; 44 , mounting bracket; 45, electric push rod; 46, driving block; 47, first servo motor; 48, first lead screw; 49, second lead screw; 50, movable bracket; 51, spring rod; 52, driving platform; 53, connecting groove; 54, sliding part; 55, sliding through groove; 56, movable side plate; 57, limit spring; 58, limit rod; 59, contact piece; 60, blocking rod; 61, third servo motor; 62, driving disk. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] like Figure 1-7 As shown, the fully automatic intelligent calibration online oil chromatograph provided by the embodiment of the present invention includes a chromatograph body 1 and an injection needle 2 for extracting samples, a rotating disk 3 is rotatably installed above the chromatograph body 1, and an injection drive assembly 4 is arranged on the rotating disk 3, and the injection needle 2 is driven by the injection drive assembly 4 to complete the injection; when the injection is completed, the rotating disk 3 is driven to rotate so that the needle head of the injection needle 2 faces upward and the gas is discharged through the injection drive assembly 4.

[0034] Specifically in this embodiment, the chromatograph is mainly used to separate and quantitatively analyze the components in the sample mixture. The working principle of the chromatograph is based on the difference in the physicochemical properties of the substances. The separation and analysis of the samples are mainly achieved through gas chromatography and liquid chromatography. The chromatograph generally includes an injection system (equivalent to the injection needle and the injection drive assembly 4 in this embodiment), an infusion system, a separation system (including a chromatographic column and a thermostat), a detection system and a data processing system. In this embodiment, the chromatograph body 1 includes the infusion system, the separation system, the detection system and the data processing system. The upper end of the chromatograph body 1 is also provided with a sample placement port (not shown in the figure), and the sample placement port is used to receive the sample output by the injection needle 2; in addition, in this embodiment, the infusion system The sample needle 2 and the injection drive assembly 4 are located directly above the chromatograph body 1. The sample needle 2 includes a needle tube, a needle and a push rod. The sample needle 2 is mainly used to absorb and transport the sample solution. The sample needle 2 takes samples from the needle tube through the push rod and pushes the sample out of the needle tube through the needle. This is the prior art and will not be repeated. Preferably, the sample needle 2 is arranged in the middle position of the rotating disk 3. In the initial state, that is, when preparing for injection, the sample needle 2 is arranged vertically. When the sample needle 2 is in the vertical state, the sample placement port is located directly below the sample needle 2. In the prior art, after the sample needle 2 completes the injection, the needle will be directly inserted into the sample placement port through the injection drive assembly 4 and the sample solution will be squeezed out. In this embodiment, after the sample needle 2 completes the injection, the rotating disk 3 is rotated. , the injection needle 2 is rotated 180 degrees and then exhausted. After the exhaust is completed, it is inserted into the sampling port and the sample solution is squeezed out; the upper end of the chromatograph body 1 is a horizontal plane, and the rotating disk 3 is arranged vertically and is located directly above the chromatograph body 1 when sampling. The rotating disk 3 is a circular plate structure and can be rotated or turned when driven. When exhausting, the rotating disk 3 rotates 180 degrees so that the injection needle 2 also rotates synchronously and the needle faces upward; the injection drive component 4 is mainly used to drive the needle tube (that is, the injection needle 2 as a whole) and the push rod to move respectively to perform sampling work. When sampling is required, the injection drive component 4 drives the injection needle 2 to move downward as a whole and drives the needle to insert into the sample solution, and then drives the push rod to pull outward to inhale the sample Solution; the injection needle 2 has three working modes, namely, injection mode, exhaust mode and sample placement mode. In the injection mode, the needle of the injection needle 2 is directed downward and arranged vertically by the movement of the rotating disk 3, and then the injection drive assembly 4 drives the injection needle 2 to move downward for injection, and then enters the exhaust mode, the needle of the injection needle 2 is directed upward and arranged vertically by the rotation of the rotating disk 3, and then the push rod is driven to move by the injection drive assembly 4 to squeeze out the air in the needle tube upward, and at the same time, the solution in the needle tube can be slightly adjusted. After the exhaust is completed, it enters the sample placement mode, at this time, the rotation of the rotating disk 3 drives the injection needle 2 to reset and point the needle downward, and then the injection drive assembly 4 drives the injection needle 2 to move downward so that the needle is inserted into the sample placement port for sample placement;Through the above technical solution, the posture of the injection needle 2 can be adjusted to simulate the situation of artificial exhaust, so as to avoid the exhaust of air into the chromatograph and affect the analysis results. In addition, when the needle is facing upward, the amount of sample solution in the needle tube can be fine-tuned. Compared with the fine-tuning of the sample solution amount when the injection needle 2 is facing downward, the fine-tuning at this time can make the sample solution squeeze out more slowly, which is conducive to controlling the amount of sample solution in the needle tube. ;

[0035] In another embodiment provided by the present invention, a mounting side plate 11 is fixed to the upper end of the chromatograph body 1, and the mounting side plate 11 is a square plate structure. A plurality of fixed shafts 12 are fixed on the mounting side plate 11, and a limiting roller 13 is rotatably installed on the fixed shaft 12. The plurality of limiting rollers 13 are used to limit the rotation (i.e., rotation) of the rotating disk 3 on the same virtual circle. The number of limiting rollers 13 is preferably three and they are evenly arranged. The rotation of the rotating disk 3 is limited by the limiting rollers 13 in order to facilitate the installation of the sample injection drive assembly 4 in the middle of the rotating disk 3. A circular hole 14 is also provided on the mounting side plate 11, and the center of the circular hole 14 coincides with the center of the rotating disk 3. The purpose of providing the circular hole 14 is to facilitate the installation of the sample injection drive assembly 4 on the rotating disk 3.

[0036] In another embodiment provided by the present invention, an automatic sample changer 16 is rotatably installed on the upper end surface of the chromatograph body 1, and the automatic sample changer 16 includes a circular turntable 17. A plurality of plug-in slots are opened circumferentially on the circular turntable 17, and injection bottles are inserted in the plug-in slots. The injection bottles contain sample solutions for detection. The circular turntable 17 is also provided with a fan-shaped opening 171, and the fan-shaped opening 171 is used to insert the injection needle 2 into the sample placement port. During injection or exhaust, a certain injection bottle on the circular turntable 17 is located directly above the sample placement port. During sample placement, the automatic sample changer 16 is driven and the fan-shaped opening 171 moves to directly below the injection needle 2 in a vertical state. At this time, the sample placement port corresponds to the injection needle 2, and the injection needle 2 can be inserted into the sample placement port by moving downward. The automatic sample changer 16 is a prior art, which is mainly used to move the required injection bottle to directly below the injection needle 2, and no further details will be given.

[0037] In another embodiment provided by the present invention, the injection drive assembly 4 includes a through slot 41 provided on the rotating disk 3, and the through slot 41 is preferably a square structure. When sampling or exhausting, the through slot 41 is arranged vertically, and a connecting block is slidably installed in the through slot 41. A mounting plate 43 is fixedly provided at the front end of the connecting block (close to the automatic sample changer 16), and the injection needle 2 is detachably installed on the mounting plate 43; a mounting bracket 44 is fixed to the upper end of the mounting plate 43, and an electric push rod 45 is installed on the mounting bracket 44, and the movable end of the electric push rod 45 is detachably connected to the push rod of the injection needle 2; a driving block 46 is formed at the rear end of the connecting block (away from the automatic sample changer 16), and a first servo motor 47 is installed at the rear end of the rotating disk 3, and a first screw is connected to the output shaft of the first servo motor 47 48, the first lead screw 48 is threadedly arranged on the driving block 46, and the driving block 46 and the connecting block are driven to slide by the rotation of the first lead screw 48, thereby driving the mounting plate 43, the injection needle 2 and the electric push rod 45 to slide as a whole; during injection, the first lead screw 48 is driven to rotate by the first servo motor 47, and since the connecting block is slidably installed in the through groove 41, the first lead screw 48 drives the driving block 46 to move radially and drives the injection needle 2 to move downward and insert into the injection bottle. At this time, the push rod is pulled upward by the electric push rod 45 so that the solution in the injection bottle is sucked into the needle tube, thus completing the injection; during exhaust, the rotating disk 3 rotates 180 degrees to make the needle head of the injection needle 2 face upward. At this time, the push rod is pushed to move by the electric push rod 45 to squeeze out the gas in the needle tube, and at the same time squeeze out part of the solution, so as to fine-tune the amount of solution in the needle tube.

[0038] In another embodiment provided by the present invention, an inner gear ring 31 is fixed at the rear end of the rotating disk 3, and the inner gear ring 31 has the same diameter as the rotating disk 3. A second servo motor 32 is installed on the mounting side plate 11, and a driving gear 33 is connected to the output shaft of the second servo motor 32. The driving gear 33 and the inner gear ring 31 are meshed with each other. In this way, the driving gear 33 is driven to rotate by the second servo motor 32, thereby controlling the rotation of the inner gear ring 31 and the rotating disk 3. Driving the rotating disk 3 to rotate in this way is also to free up the middle part of the rotating disk 3, so that the sampling drive assembly 4 can drive the sampling needle 2 to move.

[0039] In another embodiment of the present invention, a stop block 15 is formed at the front end of the fixed shaft 12. The stop block 15 is a square structure. The stop block 15 is attached to the front end of the rotating disk 3 to prevent the rotating disk 3 from falling out.

[0040] A placer 18 is fixed on the top of the mounting side plate 11, and an exhaust bottle 19 is clamped in the placer 18. The injection bottle and the exhaust bottle 19 are both commonly used glass bottles in chromatographs and will not be described in detail. The exhaust bottle 19 is used to exhaust the injection needle 2. The exhaust bottle 19 is inverted. When exhausting, the needle of the injection needle 2 faces upward, and the needle of the injection needle 2 is driven to be inserted into the exhaust bottle 19 by the injection drive assembly 4. At this time, the injection needle 2 is exhausted by the injection drive assembly 4, but a small amount of sample solution will be squeezed out during this process. A small amount of sample solution enters the exhaust bottle 19 and will not drip.

[0041] The injection needle 2 has two working modes, namely, an injection mode and an exhaust mode; in the injection mode, the injection needle 2 is inserted downward into the injection bottle for injection; in the exhaust mode, the injection needle 2 is inserted upward into the exhaust bottle 19 for exhaust; preferably, the upward end of the exhaust bottle 19 is connected to the external environment (such as a through hole is provided at the upward end of the exhaust bottle 19), so as to prevent gas from entering the exhaust bottle 19 and squeezing out the solution in the exhaust bottle 19.

[0042] For further information, see Figure 5-7In order to ensure the accuracy of the detection, the injection and placement of the injection needle 2 need to be completed at a faster speed (fast injection and placement can reduce the time the sample solution stays in the injection needle 2 and reduce the loss of volatile samples), but when exhausting, the exhaust speed needs to be slowed down. This is mainly to avoid accidentally discharging too much solution when discharging bubbles, and can also accurately adjust the amount of solution in the injection needle 2. To this end, this embodiment provides a further solution to solve the above technical problems; it should be noted that the difference between this embodiment and the above embodiment is that the electric push rod 45 is no longer used to control the movement of the push rod, and the electric push rod 45 is no longer directly connected to the push rod; in this embodiment, the injection drive assembly 4 also includes a second screw 49 rotatably mounted on the upper end of the mounting bracket 44, and a movable bracket 50 is threadedly connected to the second screw 49, and the lower end of the movable bracket 50 is detachably connected to the push rod, and a spring rod 51 is fixed to the top of the second screw 49, and the spring rod 51 is fixed to the top of the second screw 49. A driving platform 52 is fixedly arranged on the top of the rod 51. The driving platform 52 is a truncated cone structure and the diameter of the upper end surface is smaller than the diameter of the lower end surface. A connecting groove 53 is also provided on the rotating disk 3. Preferably, the extending direction of the connecting groove 53 is parallel to the extending direction of the through groove 41. A sliding portion 54 is slidably installed in the connecting groove 53. The sliding portion 54 is a square block structure. A sliding through groove 55 is provided on the sliding portion 54. A movable side plate 56 is slidably penetrated in the sliding through groove 55. In this case, the sliding groove 55 is arranged horizontally, and a limit spring 57 is connected between the movable side plate 56 and the connecting groove 53. The limit spring 57 is used to limit the position of the movable side plate 56. A limit rod 58 is formed on the movable side plate 56. The limit rod 58 is slidably penetrated on the mounting bracket 44. The function of the limit rod 58 is to enable the movable side plate 56 to follow the mounting bracket 44 to move in the vertical direction and ensure that the movable side plate 56 can also move in the horizontal direction.An L-shaped contact piece 59 is formed at the rear end of the movable side plate 56, and a blocking rod 60 is installed on the side wall of the circular hole 14. The blocking rod 60 and the contact piece 59 are correspondingly arranged. When the rotating disk 3 rotates 180 degrees (from injection to exhaust), the contact piece 59 contacts the blocking rod 60, and the blocking rod 60 pushes the contact piece 59 and the movable side plate 56 to slide in the connecting groove 53, and the sliding direction of the movable side plate 56 is to slide in the direction away from the second lead screw 49. The elastic coefficient of the limit spring 57 is greater than the elastic coefficient of the spring rod 51. A third servo motor 61 is installed at the front end of the movable side plate 56, and a driving disk 62 is installed on the rotating shaft of the third servo motor 61. The side wall of the driving disk 62 is inclined and the inclination angle is consistent with the inclination angle of the side wall of the driving platform 52. This is to facilitate the contact between the driving disk 62 and the driving platform 52 to be more stable. Under the elastic action of the limit spring 57, the driving disk 62 is pressed tightly against the outer surface of the driving platform 52. On the side wall, the drive disk 62 and the drive platform 52 are driven by friction; in the injection mode, the drive disk 62 contacts the top of the drive platform 52, and the rotation speed of the drive platform 52 is the fastest (this is because the diameter of the contact position between the drive platform 52 and the rotating disk is the smallest, and the number of rotations of the drive platform 52 when the drive disk 62 rotates one circle is also the largest), the spring rod 51 is in a compressed state, and the drive platform 52 also has a tendency to move away from the second lead screw 49, but the drive platform 52 is blocked by the drive disk 62, so the drive platform 52 and the drive disk 62 are closely attached to each other; when the injection mode is switched to the exhaust mode, the drive disk 62 contacts the bottom of the drive platform 52, and the rotation speed of the drive platform 52 is the slowest, and the spring rod 51 is still in a compressed state, and the drive platform 52 and the drive disk 62 are also closely attached to each other; in summary, it can be seen that at the same rotation speed of the third servo motor 61, the injection speed of the injection needle 2 is much greater than the exhaust speed of the injection needle 2. ;

[0043] Specifically, in the present embodiment, a speed change mode is added. In the complete injection and placement process, the sequence is: injection mode, speed change mode, exhaust mode and placement mode. In the injection mode, the needle of the injection needle 2 faces downward. At this time, the driving disk 62 contacts the top of the driving platform 52, and the first servo motor 47 is started to make the first lead screw 48 rotate synchronously and drive the mounting plate 43 to move downward. The mounting bracket 44 also moves downward and drives the limit rod 58 and the sliding part 54 to move downward. When the injection needle 2 is inserted into the injection bottle, the third servo motor 61 is started. At this time, the driving disk 62 contacts the top of the driving platform 52, and the driving platform is driven by the rotation of the driving disk 62. 52 rotates synchronously (at this time, the rotation speed of the driving platform 52 is the fastest), the second lead screw 49 rotates accordingly and drives the movable bracket 50 to move upward, and the movable bracket 50 drives the push rod to move upward so that the solution enters the injection needle 2; in the speed change mode, after the injection is completed, the injection needle 2 is driven to reset, and then the rotating disk 3 is driven to rotate (clockwise when viewed from the back), so that the injection needle 2, the mounting bracket 44 and the movable side plate 56 also rotate synchronously, and then the contact member 59 also begins to gradually contact with the blocking rod 60, and the blocking rod 60 pushes the contact member 59 to slide in the direction away from the second lead screw 49, so that the movable side plate 56 drives the driving disk 62 and the third servo motor 61 The second guide screw 49 is also moved synchronously in the direction away from the second lead screw 49. At this time, the limit spring 57 is compressed, and the limit rod 58 also rotates accordingly. Under the elastic action of the spring rod 51, the driving platform 52 moves outward and re-attaches to the driving disk 62. At this time, the larger side of the outer wall of the driving platform 52 is directly attached to the driving disk 62. In this way, when the driving disk 62 rotates again, the rotation speed of the driving platform 52 can be reduced, so that the rotation speed of the second lead screw 49 decreases accordingly, thereby reducing the movement speed of the movable bracket 50 and the push rod; when the rotating disk 3 rotates 180 degrees, it stops rotating. At this time, the larger side of the outer wall of the driving platform 52 is already attached to the driving disk 62, and then the injection needle 2 is driven to be inserted into the exhaust After the bottle 19 is removed, the third servo motor 61 is started, so that the driving disk 62 rotates and drives the driving platform 52 to rotate. At this time, since the larger side of the outer wall of the driving platform 52 is already in contact with the driving disk 62, the movement speed of the push rod is also significantly reduced, and the gas in the injection needle 2 can be slowly discharged and the amount of solution in the injection needle 2 can be properly adjusted; in the sample placement mode, the rotating disk 3 is reset according to the original path. At this time, the moving side plate 56 is also reset under the elastic action of the limit spring 57, and the driving disk 62 squeezes the driving platform 52 to reset. In this way, the driving disk 62 contacts the smaller diameter part of the outer wall of the driving platform 52, and the movement speed of the push rod is restored, thereby ensuring the speed of the sample placement process.

[0044] In summary, the speed of the push rod movement can be passively adjusted according to the rotation angle of the rotating disk 3. In the injection mode and the placement mode, the push rod moves at a faster speed, which helps to ensure the accuracy of the chromatograph's detection. In the exhaust mode, the push rod moves at a slower speed, which can slowly squeeze out the bubbles and can also accurately adjust the amount of solution in the injection needle 2.

[0045] Further, see Figure 5-7 According to the cleaning specification of the injection needle 2, the same solution as the sample solution needs to be extracted through the injection needle 2 for cleaning; when the injection needle 2 is cleaned manually, the principle of "slow extraction and fast discharge" needs to be followed and repeated at least three times. The slow extraction during cleaning is to allow the solution to stay on the inner wall of the injection needle 2 for a longer time, fully dissolve and remove the sample residues attached to the inner wall, and at the same time avoid the generation of bubbles. The fast discharge is to quickly remove the residues and avoid the needle from being blocked. When the existing automatic sampler cleans the injection needle 2, the injection needle 2 is directly inserted into the cleaning bottle and cleaned in a slow extraction and fast discharge manner. However, the disadvantage of this cleaning method is that the solution discharged after cleaning is still retained in the cleaning bottle, affecting the cleaning effect; for this reason, based on the above embodiment, a cleaning device is installed on the placement device 18. Bottle (not shown in the figure), the cleaning bottle is filled with the same cleaning solution as the sample solution, and a collecting bottle (not shown in the figure) is inserted on the circular turntable 17; only the operation in the above embodiment is required, with the needle facing upwards, the cleaning solution in the cleaning bottle is slowly extracted (corresponding to the exhaust mode, only the rotation direction of the drive disk 62 needs to be opposite), and when the needle is inserted into the collecting bottle downwards, the solution in the injection needle 2 is quickly discharged (corresponding to the injection mode, only the rotation direction of the drive disk 62 needs to be opposite). That is to say, in this embodiment, the speed of the push rod movement is passively adjusted according to the rotation angle of the rotating disk 3 in the above embodiment, so that the injection drive assembly 4 is not only suitable for fast injection and slow exhaust, but also can be used in the cleaning mode of slow extraction and fast exhaust, thereby improving the utilization rate of the device while ensuring the cleaning effect.

[0046] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fully automatic intelligent calibration online oil chromatograph, comprising a chromatograph body and a sampling needle for extracting samples, characterized in that: A rotating disk is rotatably mounted above the chromatograph body, and an injection drive assembly is disposed on the rotating disk. The injection needle is driven by the injection drive assembly to complete the injection. When the injection is completed, the rotating disk is driven to rotate so that the injection needle tip faces upward and the gas is exhausted through the injection drive assembly.

2. The fully automatic intelligent calibration online oil chromatograph according to claim 1, characterized in that: A mounting side plate is fixed on the upper end of the chromatograph body, and a plurality of fixed shafts are fixed on the mounting side plate. Limit rollers are rotatably mounted on the fixed shafts. The plurality of limit rollers are on the same virtual circle and are used to limit the rotation of the rotating disk. A circular hole is also provided on the mounting side plate, and the center of the circular hole coincides with the center of the rotating disk.

3. The fully automatic intelligent calibration online oil chromatograph according to claim 1, characterized in that: An automatic sample changer is rotatably mounted on the upper end surface of the chromatograph body, and a sample injection bottle is arranged on the automatic sample changer. The automatic sample changer is used to move the required sample injection bottle to the position directly below the sample injection needle.

4. The fully automatic intelligent calibration online oil chromatograph according to claim 1, characterized in that: The injection drive assembly comprises a through slot provided on a rotating disk, a connecting block is slidably mounted in the through slot, a mounting plate is fixedly arranged at the front end of the connecting block, and an injection needle is detachably mounted on the mounting plate.

5. The fully automatic intelligent calibration online oil chromatograph according to claim 4, characterized in that: A mounting bracket is fixed on the upper end of the mounting plate, an electric push rod is mounted on the mounting bracket, and a movable end of the electric push rod is connected to a push rod of the injection needle in a detachable manner.

6. The fully automatic intelligent calibration online oil chromatograph according to claim 5, characterized in that: A driving block is formed at the rear end of the connecting block, a first servo motor is installed at the rear end of the rotating disk, a first lead screw is connected to the output shaft of the first servo motor, and the first lead screw is threadedly disposed on the driving block.

7. The fully automatic intelligent calibration online oil chromatograph according to claim 2, characterized in that: An inner gear ring is fixed on the rear end of the rotating disk, a second servo motor is installed on the mounting side plate, a driving gear is connected to the output shaft of the second servo motor, and the driving gear and the inner gear ring are meshed with each other.

8. The fully automatic intelligent calibration online oil chromatograph according to claim 7, characterized in that: A stop block is formed at the front end of the fixed shaft, and the stop block is attached to the front end of the rotating disk to prevent the rotating disk from falling out.

9. The fully automatic intelligent calibration online oil chromatograph according to claim 1, characterized in that: A placing device is fixed on the top of the mounting side plate, and an exhaust bottle is clamped inside the placing device. The exhaust bottle is used to exhaust the injection needle.

10. The fully automatic intelligent calibration online oil chromatograph according to claim 9, characterized in that: The injection needle has two working modes, namely, injection mode and exhaust mode; In the injection mode, the injection needle is inserted downward into the injection bottle for injection; In exhaust mode, the injection needle is inserted upward into the exhaust bottle to exhaust.

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