Industrial online chromatograph based on helium ionization detector

Abstract

The invention discloses an industrial on-line chromatograph based on a helium ionization detector, and relates to the field of component detection, the industrial on-line chromatograph comprises a chromatograph body and an auxiliary sample introduction mechanism arranged on the chromatograph body, the auxiliary sample introduction mechanism comprises a support arranged on the chromatograph body, and an injector is slidably arranged on the support; a passive injection assembly is arranged between the support and the injector, and in the process that the injector is inserted into the sample introduction part, the passive injection assembly injects a sample in the injector into the sample introduction part. According to the industrial on-line chromatograph based on the helium ionization detector, in the process that the injector slides downwards along the support to insert the needle of the injector into the sample injection part, the sample in the injector is passively injected into the sample injection part through the passive injection assembly, and therefore the sample injection process of the sample can be simplified.

Description

Technical Field

[0001] The invention relates to the field of component detection, and in particular to an industrial online chromatograph based on a helium ionization detector. Background Art

[0002] As is known, a gas chromatograph is an analytical instrument for separating compound mixtures. It uses the principle of gas chromatography to separate sample molecules between the stationary phase and the mobile phase, and then measures the relative concentration of each component through a detector. When injecting samples into the chromatograph, automatic injection or manual injection is usually used, but the automatic injection device is expensive and inflexible to use. Therefore, most users still choose manual injection when using a gas chromatograph. However, during manual injection, if the needle does not enter the injection part vertically, the needle tip will collide with the side wall of the injection part, which can easily cause damage to the needle. Therefore, it is necessary to design an auxiliary device to help the needle enter the injection part vertically.

[0003] For example, the Chinese patent document with publication number CN106770846A, publication date 2017-05-31, and titled "Manual injection auxiliary device for gas chromatograph injection syringe", includes a main body bracket, a sliding part, a needle positioning part and a positioning base; the main body bracket is installed on the positioning base; the sliding part includes a sliding member and a syringe holder fixedly connected to the sliding member; the sliding member is configured to be able to move up and down along the outer wall of the main body bracket to simultaneously drive the syringe holder to move up and down inside the bracket; the needle positioning part is located inside the main body bracket and below the syringe holder; the positioning base is located below the needle positioning part, and the positioning base includes an injection part positioning part. This application can always align the needle of the injection syringe vertically with the center of the injection part of the gas chromatograph, thereby preventing the syringe needle from being bent by touching the metal of the injection part and the influence of heat transfer on the sample when the fingers hold the syringe.

[0004] The disadvantages of the above-mentioned prior art are that after the slide member drives the syringe downward to insert the needle into the injection part, the piston rod of the syringe needs to be manually pressed to inject the sample inside the syringe into the injection part, which is a cumbersome process. Summary of the invention

[0005] The object of the present invention is to provide an industrial online chromatograph based on a helium ionization detector to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An industrial online chromatograph based on a helium ionization detector comprises a chromatograph body and an auxiliary injection mechanism arranged on the chromatograph body, wherein the auxiliary injection mechanism comprises a bracket arranged on the chromatograph body, on which a syringe is slidably arranged; a passive injection component is arranged between the bracket and the syringe, and when the syringe is inserted into the injection part, the passive injection component injects the sample inside the syringe into the injection part.

[0008] In the above-mentioned industrial online chromatograph based on helium ionization detector, a mounting groove is provided on the bracket, a slide rail is provided inside the mounting groove, a sliding member is provided on the slide rail, and the injector is provided on the sliding member.

[0009] In the above-mentioned industrial online chromatograph based on helium ionization detector, the sliding member includes a sliding block slidably connected to the sliding rail, a first mounting plate is arranged on the sliding block, and a second mounting plate is slidably arranged on the first mounting plate.

[0010] In the above-mentioned industrial online chromatograph based on helium ionization detector, a first spring is arranged between the first mounting plate and the second mounting plate.

[0011] In the above-mentioned industrial online chromatograph based on helium ionization detector, a first limiting frame is arranged on the first mounting plate, a second limiting frame is arranged on the second mounting plate, and a retaining ring is arranged on the second mounting plate.

[0012] The above-mentioned industrial online chromatograph based on helium ionization detector also includes a first power component for driving the injector to slowly descend and a second power component for driving the injector to instantly ascend.

[0013] In the above-mentioned industrial online chromatograph based on helium ionization detector, the first power assembly includes a cylinder fixedly connected to the bracket, and an abutment block is elastically provided on the first mounting plate. When the syringe descends, the output end of the cylinder abuts against the abutment block.

[0014] In the above-mentioned industrial online chromatograph based on helium ionization detector, an abutment rod is arranged on the chromatograph body, and the abutment rod is located on the movement stroke of the abutment block.

[0015] In the above-mentioned industrial online chromatograph based on helium ionization detector, the second power assembly further includes a driving spring, an abutment plate is provided on the first mounting plate, and the driving spring is provided between the abutment plate and the chromatograph body.

[0016] In the above-mentioned industrial online chromatograph based on helium ionization detector, a locking block is elastically provided inside the first mounting plate, a locking portion is elastically provided on the locking block, a locking hole matched with the locking portion is opened on the second mounting plate, and the locking block abuts against the abutment block.

[0017] In the above technical scheme, the industrial online chromatograph based on the helium ionization detector provided by the present invention, when the syringe slides downward along the bracket to insert the syringe needle into the injection part, the sample in the syringe is passively injected into the injection part through the passive injection component, thereby simplifying the sample injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the overall structure of the auxiliary injection mechanism provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a partial cross-sectional structure of a first mounting plate provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a partial cross-sectional structure of a first mounting plate provided by an embodiment of the present invention from another perspective;

[0023] Figure 5 An exploded schematic diagram provided for another embodiment of the present invention;

[0024] Figure 6 for Figure 2 A is an enlarged schematic diagram of the local structure at center A;

[0025] Figure 7 A schematic diagram of the overall structure provided for yet another embodiment of the present invention;

[0026] Figure 8 A schematic diagram of the connection structure between the transmission rod and the detection plate provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Chromatograph body; 2. Bracket; 3. Injector; 4. Mounting slot; 5. Slide rail; 6. Slider; 7. First mounting plate; 8. Second mounting plate; 9. Slide bar; 10. First limit frame; 11. Second limit frame; 12. Snap ring; 13. First spring; 14. Cylinder; 15. Abutment block; 16. Square hole; 17. Movable slot; 18. Second spring; 19. Abutment rod; 20. Drive spring; 21. Abutment plate; 22. Locking block; 23. L-shaped rod; 24. Locking part; 25. Locking hole; 26. Monitoring plate; 27. Transmission rod; 28. Third spring; 29. ​​Gear; 30. Tooth plate; 31. Rotating frame; 32. Abutment part; 33. Injection part; 34. Detection port. DETAILED DESCRIPTION

[0029] 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.

[0030] In the description of the present invention, it is necessary to understand that the position of the cylinder 14 relative to the abutment rod 19 in the figure is upper, and vice versa. The terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Reference Figure 1-8 The industrial online chromatograph based on the helium ionization detector provided in the embodiment of the present invention comprises a chromatograph body 1 and an auxiliary injection mechanism arranged on the chromatograph body 1, wherein the auxiliary injection mechanism comprises a bracket 2 arranged on the chromatograph body 1, and a syringe 3 is slidably arranged on the bracket 2; a passive injection component is arranged between the bracket 2 and the syringe 3, and when the syringe 3 is inserted into the injection part 33, the passive injection component injects the sample inside the syringe 3 into the injection part 33.

[0032] Specifically, the chromatograph body 1 is an instrument for component analysis. When it is working, the sample is injected into the injection part 33 (in this application, the injection part 33 is a general term for structures such as the injection port and the vaporization chamber) through the micro-injector 3, and the sample is converted into gas by the high temperature of the injection part 33, and then an inert gas such as helium or nitrogen is introduced into the injection part 33, so that the vaporized sample enters the chromatographic column to separate the various components in the sample, and then the concentrations of the various components separated by the chromatographic column are converted into electrical signals through the detector, so as to draw a chromatogram. When the sample is injected, in order to make the needle of the syringe 3 vertically enter the injection part 33, it adopts a device such as the publication number CN106770846A to assist the sample injection. This is a prior art and will not be repeated. One of the core innovations of the embodiment of the present invention is that an auxiliary injection mechanism is provided at the position of the injection part 33 of the chromatograph body 1, and the auxiliary injection mechanism includes a bracket 2 The cross section of the bracket 2 is a right-angled trapezoid, which is fixed to the upper surface of the chromatograph body 1 by bolts and other components. The syringe 3 (which includes a rod-shaped pushing portion, a cylindrical holding portion and a needle-shaped puncture portion) can move vertically on the vertical plane of the bracket 2. It has a mounting position away from the injection portion 33 and an injection position inserted into the injection portion 33. The passive injection component can be a reciprocating drive component such as an electric push rod, and its output end is connected to the pushing portion. The purpose of such a setting is that before injection, the syringe 3 is set on the mounting position, and then a vertical downward force is provided to the syringe 3, so that the puncture portion is inserted into the injection portion 33. That is, the syringe 3 is in the injection position at this time. At this time, the passive injection component provides the pushing portion with power to slide toward the inside of the holding portion, so that the sample inside the holding portion can be injected into the injection portion 33, so that the sample injection operation is completed, thereby simplifying the sample injection process.

[0033] Preferably, the bracket 2 is provided with a mounting groove 4, a slide rail 5 is provided inside the mounting groove 4, a sliding member is provided on the slide rail 5, and the syringe 3 is provided on the sliding member. Specifically, the mounting groove 4 is vertically arranged on the vertical surface of the bracket 2, the slide rail 5 is embedded in the mounting groove 4, the sliding member is a structure that cooperates with the slide rail 5, and can move vertically along the slide rail 5, and the syringe 3 can be provided on the sliding member by a structure such as a bolt, so that the syringe 3 can be switched between the mounting position and the injection position by sliding the sliding member along the slide rail 5.

[0034] Preferably, the sliding member includes a slider 6 slidably connected with the slide rail 5, a first mounting plate 7 is provided on the slider 6, and a second mounting plate 8 is slidably provided on the first mounting plate 7. Specifically, the first mounting plate 7 is fixedly connected to the slider 6, and two sliding rods 9 are fixedly connected to the lower surface of the first mounting plate 7, and a sliding hole matching the sliding rod 9 is provided on the second mounting plate 8, the sliding rod 9 is connected to the sliding hole, and a limiting structure for preventing the two from being separated from each other is provided between the two, so that the second mounting plate 8 can slide relative to the first mounting plate 7 in the vertical direction.

[0035] Furthermore, a first limiting frame 10 is provided on the first mounting plate 7, a second limiting frame 11 is provided on the second mounting plate 8, and a snap ring 12 is provided on the second mounting plate 8. Specifically, a first flange portion is provided on the top of the pushing portion, and the radial dimension of the first flange portion is larger than the radial dimension of the top of the pushing portion. A clamping groove matching the end of the first flange portion is provided on the first limiting frame 10, and a second flange portion is provided on the top of the containing portion, and the second flange portion protrudes from the outer peripheral surface of the containing portion. A second clamping groove matching the second flange portion is provided on the second limiting frame 11. There are two groups of snap rings 12, and both are provided on the second mounting plate 8. It is composed of two arc-shaped plates, and a limiting space matching the containing portion is formed between the two arcs, and the snap ring 12 is made of elastic material. The purpose of such a setting is that when fixing the syringe 3, the first The position of the first flange portion and the position of the first slot are adjusted to the same vertical height, and the position of the second flange portion and the position of the second slot are adjusted to the same vertical height. At this time, the receiving portion is located on the side of the open end of the snap ring 12, and then the receiving portion is pressed. Since the snap ring 12 is made of elastic material, the snap ring 12 is stretched open. When the receiving portion enters the internal space of the snap ring 12, the snap ring 12 automatically resets under the action of its own elastic force to limit the receiving portion in its internal space to achieve the horizontal limitation of the receiving portion. At the same time, the first flange portion is inserted into the first slot, and the second flange portion is inserted into the second slot. Through the plug-in connection of the first flange portion and the first slot By using the second mounting plate 7 and the second slot, the pushing portion can be limited in the vertical direction. By plugging the second flange portion and the second slot, the containing portion can be limited in the vertical direction. In this way, the syringe 3 can be fixed on the sliding member as a whole. When the syringe 3 is switched from the mounting position to the injection position, the first mounting plate 7 and the second mounting plate 8 move vertically downward and drive the puncture portion to enter the injection portion 33. When the lower surface of the second mounting plate 8 abuts against the chromatograph body 1, the second mounting plate 8 cannot move downward. At this time, the first mounting plate 7 is controlled to continue to move downward. At this time, the first mounting plate 7 moves downward relative to the second mounting plate 8, that is, the pushing portion slides toward the containing portion to The space inside the containing part is squeezed, so that the sample is injected into the injection part 33 to realize passive injection of the sample. When the injection is completed, the syringe 3 is controlled to switch from the injection position to the installation position. At this time, the first mounting plate 7 moves upward first, so that the first mounting plate 7 moves upward relative to the second mounting plate 8, so that the pushing part slides toward the outside of the containing part, and the second mounting plate 8 is driven to be lifted upward under the action of the limiting structure between the slide rod 9 and the slide hole. When the puncture part is pulled out of the injection part 33, the automatic resetting of the syringe 3 is completed, and then a force is provided to the syringe 3 in the direction away from the second mounting plate 8, so that the syringe 3 is removed from the retaining ring 12.

[0036] It should be noted that since the detection time of the chromatograph body 1 is generally 5-8 minutes, during this time, the syringe 3 containing another sample can be fixed in the installation position in advance through the retaining ring 12 and the limit frame and other structures. When the chromatograph body 1 is cleaned, the syringe 3 is controlled to switch from the installation position to the injection position, and another sample can be directly injected, thereby improving the sample injection efficiency.

[0037] Furthermore, a first spring 13 is provided between the first mounting plate 7 and the second mounting plate 8. There are two first springs 13, and the two first springs 13 are respectively sleeved on the two slide bars 9, and the elastic force of the first spring 13 is greater than the gravity of the second mounting plate 8. The effect of such a setting is that, under the elastic force of the first spring 13, the distance between the first mounting plate 7 and the second mounting plate 8 can be flexibly fixed to avoid the relative sliding of the first mounting plate 7 and the second mounting plate 8 during the sliding process of the sliding member as much as possible. Since the pushing part is connected to the first mounting plate 7 and the containing part is connected to the second mounting plate 8, the pushing part can be prevented from squeezing the space inside the containing part as much as possible, thereby reducing the loss of the sample, and under the connection of the first spring 13, the second mounting plate 8 can be lifted without moving the slide bar 9 up to the maximum distance to reduce the overall movement stroke of the sliding member.

[0038] It should be noted that when the sample is injected, the syringe 3 is inserted into the injection part 33, in order to avoid the syringe 3 from being inserted crooked, so the process of the syringe 3 moving from the installation position to the injection position is slow, but when the sample is injected, in order to avoid air entering the injection part 33 as much as possible, the syringe 3 needs to be quickly withdrawn from the injection part 33, and further, it also includes a first power assembly for driving the syringe 3 to slowly descend and a second power assembly for driving the syringe 3 to rise instantly. Specifically, the first power assembly can be a reciprocating drive assembly such as a ball screw, and the second power assembly can be an elastic instantaneous drive. The effect of such a setting is that when the syringe 3 is switched from the installation position to the injection position, the first power assembly drives the slide and the syringe 3 to descend, and accumulates power for the second power assembly during the descent process. When the sample in the syringe 3 is injected, the first power assembly is disconnected from the slide, and the elastic force accumulated by the second power assembly is released instantly, so that the puncture part can be instantly withdrawn from the injection part 33 to avoid air entering the injection part 33 as much as possible.

[0039] Preferably, the first power assembly includes a cylinder 14 fixed to the bracket 2 , and an abutment block 15 is elastically provided on the first mounting plate 7 , and when the syringe 3 descends, the output end of the cylinder 14 abuts against the abutment block 15 . Specifically, the cylinder 14 is vertically arranged on the bracket 2, a square hole 16 is opened on the first mounting plate 7, and a movable groove 17 is opened on the side wall of the square hole 16, a wedge-shaped surface is arranged on the abutment block 15, and the abutment block 15 has two, and is respectively inverted in the two movable grooves 17, the abutment block 15 is slidably connected with the movable groove 17, and an elastic setting, that is, a second spring 18 is arranged between the abutment block 15 and the movable groove 17, and the elastic force of the second spring 18 makes the end of the abutment block 15 with the wedge-shaped surface inserted into the square hole 16. The effect of such a setting is that when the output end of the cylinder 14 is extended, it will abut against the horizontal surface of the abutment block 15, so that the abutment block 15, the first mounting plate 7 and the second mounting plate 8 move vertically downward to provide a driving force for the syringe 3 to stably switch from the mounting position to the injection position.

[0040] Furthermore, an abutment rod 19 is provided on the chromatograph body 1 , and the abutment rod 19 is located on the movement stroke of the abutment block 15 . Specifically, the abutment rod 19 is arranged vertically and is located below the square hole 16. Two wedge-shaped surfaces are symmetrically arranged at the end of the abutment rod 19, and the wedge-shaped surface of the abutment rod 19 is located on the movement stroke of the wedge-shaped surface of the abutment block 15. The purpose of such a setting is that when the first power component drives the first mounting plate 7 and other components to move downward through the abutment block 15, the wedge-shaped surface of the abutment block 15 will abut against the wedge-shaped surface at the top of the abutment rod 19, so that the two abutment blocks 15 slide synchronously toward the inside of the movable groove 17 and squeeze the second spring 18 to achieve avoidance. When the gap between the two abutment blocks 15 is equal to the radial dimension of the output end of the cylinder 14 (at this time, the pushing part slides to the maximum distance relative to the containing part, that is, at this time, the sample inside the containing part has been almost completely injected into the injection part 33), it will be inserted into the gap. At this time, the power at the output end of the cylinder 14 will no longer continue to be transmitted to the first mounting plate 7, so that the first power component is disconnected from the sliding member.

[0041] Furthermore, the second power assembly also includes a driving spring 20. An abutment plate 21 is provided on the first mounting plate 7. The driving spring 20 is provided between the abutment plate 21 and the chromatograph body 1. Specifically, the abutment plate 21 is a plate-shaped structure extending from the first mounting plate 7 to both ends. One end of the driving spring 20 is fixedly connected to the lower surface of the abutment plate 21, and the other end abuts against the upper surface of the chromatograph body 1. There are two driving springs 20, and the two driving springs 20 are symmetrically arranged with respect to the first mounting plate 7. The effect of such an arrangement is that when the first power assembly drives the syringe 3 and the sliding member to move downward, the driving spring 20 will be squeezed, thereby producing a buffering effect on the syringe 3 and accumulating force on the driving spring 20. When the output end of the cylinder 14 is inserted into the two abutment blocks 15, its limiting effect on the abutment block 15 in the vertical direction disappears. At this time, the elastic force of the driving spring 20 is released instantly, so that the first mounting plate 7 moves up quickly, thereby driving the second mounting plate 8 and the syringe 3 to move up quickly, so that the puncture part is quickly withdrawn from the injection part 33. When the first mounting plate 7 moves up to the maximum value, under the repeated expansion and contraction force of the driving spring 20, the syringe 3 will produce a shaking effect, so that the sample attached to the surface of the syringe 3 can be shaken off, so as to reduce the difficulty of subsequent cleaning of the syringe 3.

[0042] The above-mentioned method of driving the syringe 3 to switch from the injection position to the installation position by driving the spring 20 will cause the first mounting plate 7 to move up first, and then the second mounting plate 8 can be driven to move up under the connecting action of the first spring 13. In this process, the pushing part will move upward relative to the containing part, thereby producing a suction effect on the internal space of the containing part, during which part of the sample that has been injected into the injection part 33 will be extracted from the injection part 33 by the syringe 3, thereby causing the sample to be wasted. As another embodiment of the present invention, a locking block 22 is elastically provided inside the first mounting plate 7, and a locking part 24 is elastically provided on the locking block 22. A locking hole 25 compatible with the locking part 24 is opened on the second mounting plate 8, and the locking block 22 abuts against the abutment block 15.Specifically, the locking block 22 is also slidably arranged in the movable groove 17. In the present embodiment, one end of the second spring 18 is fixedly connected to the side wall of the movable groove 17, and the other end is fixedly connected to the locking block 22. An L-shaped rod 23 is arranged at the bottom of the locking block 22. The locking portion 24 is slidably sleeved on the end of the L-shaped rod 23, and an elastic member such as a spring is arranged between the two. The locking hole 25 is located on the movement stroke of the locking portion 24. In order to facilitate the insertion of the locking portion 24 and the locking hole 25, the radial dimension of the locking hole 25 is slightly larger than the radial dimension of the locking portion 24. A wedge-shaped surface is also arranged on the locking block 22. One end of the abutting block 15 located inside the movable groove 17 abuts against the wedge-shaped surface of the locking block 22. Under the abutment of the locking block 22 and the elastic force of the second spring 18, the abutting block One end of the wedge-shaped surface 15 is inserted into the square hole 16. The effect of such a setting is that when the output end of the cylinder 14 drives the wedge-shaped surface of the abutting block 15 to abut against the wedge-shaped surface of the abutting rod 19, it has the following advantages. First, when the abutting block 15 slides toward the inside of the movable groove 17, the first power component is switched to the second power component. Second, in this process, it will abut against the wedge-shaped surface of the locking block 22, so that the locking block 22 slides toward the outside of the movable groove 17 and stretches the second spring 18, thereby driving the L-shaped rod 23 and the locking part 24 to move downward and toward the direction of the second mounting plate 8. In this process, the end of the locking part 24 will abut against the side of the second mounting plate 8, so that the locking part 24 moves in the direction of the locking block 22. When the abutment block 15 and the abutment rod 19 are completely abutted, the locking block 22 and the locking hole 25 coincide with each other, that is, the limiting effect of the second mounting plate 8 on the locking portion 24 disappears, and the elastic force of the elastic member is released, so that the locking portion 24 is instantly inserted into the locking hole 25, so that under the action of the locking block 22 and the locking portion 24, a locking effect is generated on the first mounting plate 7 and the second mounting plate 8 in the vertical direction, so that in the early stage of the upward movement of the first mounting plate 7, the second mounting plate 8 will move synchronously with the first mounting plate 7, so that in the process of the puncture portion being drawn out from the sampling portion 33, a suction effect will not be generated on the inside of the sampling portion 33, so as to reduce the waste of the sample, and when the syringe 3 is driven After switching to the installation position under the elastic force of the spring 20, the output end of the control cylinder 14 contracts. When the bottom end of the output end of the cylinder 14 moves to the top of the abutment block 15, the elastic force of the second spring 18 is released, thereby driving the locking block 22 to slide toward the inside of the movable groove 17. In this process, there are the following benefits. First, the locking portion 24 is driven to be withdrawn from the locking hole 25 to release the locking effect between the first mounting plate 7 and the second mounting plate 8. At this time, the elastic force of the first spring 13 is released, thereby causing the second mounting plate 8 to move downward to drive the second mounting plate 8 to automatically reset. Second, the wedge surface of the locking block 22 abuts against the abutment block 15, thereby causing the abutment block 15 to slide toward the inside of the square hole 16 to achieve automatic reset of the abutment block 15.

[0043] A detection port 34 is provided on the chromatograph body 1. Before detecting the sample, it is necessary to ignite the inside of the detector, and then a light plate or other structure is placed at the detection port 34. Whether the ignition is successful is judged by observing whether there is fog on the light plate. However, during the sample detection process, the ignition condition is usually not monitored, thereby being unable to ensure the smooth progress of the sample detection. As another embodiment of the present invention, a monitoring plate 26 is rotatably provided on the chromatograph body 1, a transmission rod 27 is slidably provided on the chromatograph body 1, and a third spring 28 is provided between the transmission rod 27 and the chromatograph body 1, a gear 29 is provided on the monitoring plate 26, a tooth plate 30 is provided on the transmission rod 27, and the gear 29 is meshed with the tooth plate 30. Specifically, the monitoring plate 26 is located at the side of the detection port 34, and the surface close to the detection port 34 is a smooth surface. A rotating frame 31 is provided on the chromatograph body 1, and a rotating shaft is provided on the rotating frame 31. The monitoring plate 26 and the gear 29 are respectively fixed to the two ends of the rotating shaft. A sliding portion is provided at the bottom of the transmission rod 27, and a sliding groove adapted to the sliding portion is provided on the chromatograph body 1. The third spring 28 is provided between the sliding portion and the side wall of the sliding groove. An abutment portion 32 and a toothed plate 30 are respectively provided at both ends of the transmission rod 27. A wedge-shaped surface is provided on the abutment portion 32. When the syringe 3 is in the installation position, the wedge-shaped surface of the abutment portion 32 is located on the movement stroke of the abutment plate 21. When the syringe 3 is in the injection position, the abutment plate 21 abuts against the side of the abutment portion 32. The toothed plate 30 is located above the gear 29 and meshes with the gear 29. The effect of such a setting is that when the syringe 3 is switched from the installation position to the injection position, it will drive The abutment plate 21 abuts against the wedge-shaped surface of the abutment portion 32, thereby driving the transmission rod 27 and the toothed plate 30 to slide in the direction of the monitoring plate 26, and accumulating force on the third spring 28, thereby driving the gear 29, the rotating shaft and the monitoring plate 26 to passively rotate in the direction of the detection port 34, so that the monitoring plate 26 rotates to the side of the detection port 34 to monitor the ignition condition. In the subsequent downward movement of the abutment plate 21, it always abuts against the side of the abutment portion 32, so that the monitoring plate 26 remains on the side of the detection port 34. When the syringe 3 switches from the injection position to the installation position, the abutment plate 21 will move up. When the abutment plate 21 moves above the abutment portion 32, the elastic force of the third spring 28 is released, thereby driving the transmission rod 27, the abutment portion 32 and the toothed plate 30 to move in the direction away from the detection port 34, thereby driving the monitoring plate 26 to rotate in the opposite direction to achieve the resetting of the monitoring plate 26.

[0044] It should be noted that the reason why the monitoring plate 26 is not always fixed at the position of the detection port 34 is that the detection port 34 continuously generates fog, and the generated fog will accumulate on the surface of the monitoring plate 26. On the one hand, when an abnormality occurs in the ignition device, the fog on the surface of the monitoring plate 26 cannot be dispersed immediately, so it is easy to cause a lag in the monitoring result. On the other hand, when too much fog accumulates, water droplets will be generated. After the generated water droplets flow into the detector, it is easy to cause damage to the detector.

[0045] 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. An industrial online chromatograph based on a helium ionization detector, comprising a chromatograph body and an auxiliary injection mechanism arranged on the chromatograph body, characterized in that: The auxiliary injection mechanism comprises a bracket arranged on the chromatograph body, and a syringe is slidably arranged on the bracket; A passive injection component is arranged between the support and the syringe. When the syringe is inserted into the injection part, the passive injection component injects the sample in the syringe into the injection part.

2. The industrial online chromatograph based on helium ionization detector according to claim 1, characterized in that: The bracket is provided with a mounting groove, a slide rail is arranged inside the mounting groove, a sliding member is arranged on the slide rail, and the syringe is arranged on the sliding member.

3. The industrial online chromatograph based on helium ionization detector according to claim 2, characterized in that: The sliding member comprises a sliding block slidably connected to the sliding rail, a first mounting plate is arranged on the sliding block, and a second mounting plate is slidably arranged on the first mounting plate.

4. The industrial online chromatograph based on helium ionization detector according to claim 3, characterized in that: A first spring is arranged between the first mounting plate and the second mounting plate.

5. The industrial online chromatograph based on helium ionization detector according to claim 3, characterized in that: A first limiting frame is arranged on the first mounting plate, a second limiting frame is arranged on the second mounting plate, and a clamping ring is arranged on the second mounting plate.

6. The industrial online chromatograph based on helium ionization detector according to claim 3, characterized in that: It also includes a first power component for driving the syringe to slowly descend and a second power component for driving the syringe to instantly rise.

7. The industrial online chromatograph based on helium ionization detector according to claim 6, characterized in that: The first power assembly includes a cylinder fixedly connected to the bracket, and an abutment block is elastically provided on the first mounting plate. When the syringe descends, the output end of the cylinder abuts against the abutment block.

8. The industrial online chromatograph based on helium ionization detector according to claim 7, characterized in that: The chromatograph body is provided with an abutment rod, and the abutment rod is located on the movement stroke of the abutment block.

9. The industrial online chromatograph based on helium ionization detector according to claim 8, characterized in that: The second power assembly further includes a driving spring. An abutment plate is disposed on the first mounting plate. The driving spring is disposed between the abutment plate and the chromatograph body.

10. The industrial online chromatograph based on helium ionization detector according to claim 9, characterized in that: A locking block is elastically provided inside the first mounting plate, a locking portion is elastically provided on the locking block, a locking hole matched with the locking portion is provided on the second mounting plate, and the locking block abuts against the abutting block.

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