Industrial on-line chromatograph based on helium ionization detector

Abstract

The present invention discloses an industrial online chromatograph based on a helium ionization detector, which relates to the field of component detection. It includes a chromatograph body and an auxiliary sampling mechanism arranged on the chromatograph body. The auxiliary sampling mechanism includes a bracket arranged on the chromatograph body, and a syringe is slidably arranged on the bracket; a passive injection assembly is arranged between the bracket and the syringe. During the process of inserting the syringe into the sampling part, the passive injection assembly injects the sample inside the syringe into the inside of the sampling part. The industrial online chromatograph based on a helium ionization detector provided by the present invention, during the process of the syringe sliding downward along the bracket to insert the syringe needle into the sampling part, the sample in the syringe is passively injected into the inside of the sampling part through the passive injection assembly, so that the sampling process of the sample can be simplified.

Description

Technical Field

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

[0002] As is well known, a gas chromatograph is an analytical instrument used to separate a mixture of compounds. It uses the principle of gas chromatography to separate sample molecules between a stationary phase and a mobile phase, and then measures the relative concentrations of each component through a detector. When injecting a sample into the chromatograph, usually an automatic injection or a manual injection method is adopted. However, the automatic injection device is expensive and not flexible to use. Therefore, most users still choose manual injection when using a gas chromatograph. However, when manually injecting, if the needle does not enter the injection part vertically, the tip of the needle will collide with the side wall of the injection part, thus easily causing damage to the needle. Therefore, an auxiliary device needs to be designed to help the needle enter the injection part vertically.

[0003] For example, in the Chinese patent document with the publication number CN106770846A, the publication date of May 31, 2017, and the title of "Manual Injection Auxiliary Device for an Injection Syringe of a Gas Chromatograph", it 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 holding member fixedly connected to the sliding member; the sliding member is arranged to be able to move up and down along the outer side wall of the main body bracket so as to drive the syringe holding member to move up and down inside the bracket at the same time; the needle positioning part is located inside the main body bracket and below the syringe holding member; the positioning base is located below the needle positioning part, and the positioning base includes an injection part positioning part. This application can always vertically align the needle of the injection syringe with the center of the injection part of the gas chromatograph, thereby preventing the syringe needle from being bent when hitting the injection part metal and the influence on the sample caused by heat transfer when the finger holds the syringe barrel.

[0004] The disadvantages of the above-mentioned prior art are that after the sliding member drives the syringe to move down to insert the needle into the injection part, it is necessary to manually press the piston rod of the syringe to inject the sample inside the syringe into the injection part, and the process is relatively cumbersome. Summary of the Invention

[0005] The purpose 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] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An industrial online chromatograph based on a helium ionization detector, comprising a chromatograph body and an auxiliary injection mechanism arranged on the chromatograph body. The auxiliary injection mechanism includes a bracket arranged on the chromatograph body, and a syringe is slidably arranged on the bracket. A passive injection component is arranged between the bracket and the syringe. During the process of inserting the syringe into the injection part, the passive injection component injects the sample inside the syringe into the injection part.

[0008] For the above-mentioned industrial online chromatograph based on a helium ionization detector, an installation groove is formed on the bracket, a slide rail is arranged inside the installation groove, a sliding part is arranged on the slide rail, and the syringe is arranged on the sliding part.

[0009] For the above-mentioned industrial online chromatograph based on a helium ionization detector, the sliding part includes a slider slidably connected to the slide rail. A first mounting plate is arranged on the slider, and a second mounting plate is slidably arranged on the first mounting plate.

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

[0011] For the above-mentioned industrial online chromatograph based on a 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 clamping ring is arranged on the second mounting plate.

[0012] For the above-mentioned industrial online chromatograph based on a helium ionization detector, it further includes a first power component for driving the syringe to slowly descend and a second power component for driving the syringe to instantaneously ascend.

[0013] For the above-mentioned industrial online chromatograph based on a helium ionization detector, the first power component includes a cylinder fixedly connected to the bracket. An abutting block is elastically arranged on the first mounting plate. When the syringe descends, the output end of the cylinder abuts against the abutting block.

[0014] For the above-mentioned industrial online chromatograph based on a helium ionization detector, a butting rod is arranged on the chromatograph body, and the butting rod is located on the moving stroke of the abutting block.

[0015] For the above-mentioned industrial online chromatograph based on a helium ionization detector, the second power component further includes a driving spring. A butting plate is arranged on the first mounting plate, and the driving spring is arranged between the butting plate and the chromatograph body.

[0016] The above-mentioned industrial on-line chromatograph based on a helium ionization detector, the inside of the first mounting plate is elastically provided with a locking block, the locking block is elastically provided with a locking portion, the second mounting plate is provided with a locking hole adapted to the locking portion, and the locking block abuts against the abutting block.

[0017] In the above technical solution, for the industrial on-line chromatograph based on a helium ionization detector provided by the present invention, during the process that the syringe slides downward along the bracket to insert the syringe needle into the sampling part, the sample in the syringe is passively injected into the inside of the sampling part through the passive injection assembly, so that the sampling process of the sample can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure provided by the embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the auxiliary sampling mechanism provided by the embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the partial sectional structure of the first mounting plate provided by the embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the partial sectional view of the first mounting plate from another perspective provided by the embodiment of the present invention;

[0023] Figure 5 It is an explosion diagram provided by another embodiment of the present invention;

[0024] Figure 6 For Figure 2 The enlarged schematic diagram of the partial structure at A in

[0025] Figure 7 It is a schematic diagram of the overall structure provided by still another embodiment of the present invention;

[0026] Figure 8 It is a schematic diagram of the connection structure between the transmission rod and the detection plate provided by the embodiment of the present invention.

[0027] Description of the reference numerals:

[0028] 1. Chromatograph body; 2. Bracket; 3. Syringe; 4. Installation groove; 5. Slide rail; 6. Slide block; 7. First mounting plate; 8. Second mounting plate; 9. Slide bar; 10. First limiting frame; 11. Second limiting frame; 12. Snap ring; 13. First spring; 14. Cylinder; 15. Contact block; 16. Square hole; 17. Activity groove; 18. Second spring; 19. Contact rod; 20. Driving spring; 21. Contact 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. Rack; 31. Rotating frame; 32. Contact part; 33. Sampling part; 34. Detection port. Detailed implementation manner

[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 should be understood that with the position of the cylinder 14 relative to the contact rod 19 in the figure as the upper, and vice versa as the lower, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] Refer to Figure 1-8 , the industrial online chromatograph based on a helium ionization detector provided by an embodiment of the present invention includes a chromatograph body 1 and an auxiliary sampling mechanism provided on the chromatograph body 1. The auxiliary sampling mechanism includes a bracket 2 provided on the chromatograph body 1, and a syringe 3 is slidably provided on the bracket 2; a passive injection assembly is provided between the bracket 2 and the syringe 3. During the process of inserting the syringe 3 into the sampling part 33, the passive injection assembly injects the sample inside the syringe 3 into the sampling part 33.

[0032] Specifically, the chromatograph body 1 is an instrument for component analysis. When it works, a sample is injected into the sample inlet part 33 (in this application, the sample inlet part 33 is a general term for structures such as a sample inlet and a vaporization chamber) through a micro syringe 3. The sample is transformed into a gas by the high temperature of the sample inlet part 33, and then an inert gas such as helium or nitrogen is introduced into the sample inlet part 33, so that the vaporized sample enters the chromatographic column to separate each component in the sample. Then, the detector converts the concentration of each component separated by the chromatographic column into an electrical signal, thereby drawing a chromatogram. When injecting the sample, in order to make the needle of the syringe 3 vertically enter the sample inlet part 33, a device with the publication number CN106770846A is used to assist in sample injection. This is the prior art and will not be elaborated. One of the core innovative points of the embodiment of the present invention is that an auxiliary injection mechanism is provided at the position of the sample inlet 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 trapezoid, and it is fixedly connected to the upper surface of the chromatograph body 1 through components such as bolts. The syringe 3 (which includes a rod-shaped pushing part, a cylindrical containing part, and a needle-shaped puncturing part) can vertically move on the vertical surface of the bracket 2. It has an installation position away from the sample inlet part 33 and an injection position inserted into the interior of the sample inlet part 33. The passive injection component can be a reciprocating driving component such as an electric push rod, and its output end is connected to the pushing part. The function of such a setting is that before injection, the syringe 3 is set at the installation position, and then a downward acting force on the syringe 3 is provided, so that the puncturing part is inserted into the interior of the sample inlet part 33, that is, at this time the syringe 3 is in the injection position. At this time, the passive injection component provides the power for the pushing part to slide towards the interior of the containing part, so that the sample in the containing part can be injected into the sample inlet part 33, thus completing the sample injection operation, and thereby simplifying the sample injection process.

[0033] Preferably, an installation groove 4 is formed on the bracket 2, a slide rail 5 is arranged inside the installation groove 4, and a sliding member is arranged on the slide rail 5. The syringe 3 is arranged on the sliding member. Specifically, the installation groove 4 is vertically arranged on the vertical surface of the bracket 2, the slide rail 5 is embedded in the installation groove 4, the sliding member is a structure matching the slide rail 5, and it can vertically move along the slide rail 5. The syringe 3 can be arranged on the sliding member through structures such as bolts. In this way, the switching of the syringe 3 between the installation position and the injection position is realized by the sliding of the sliding member along the slide rail 5.

[0034] Preferably, the sliding member includes a slider 6 slidably connected to the slide rail 5. A first mounting plate 7 is provided on the slider 6, and a second mounting plate 8 is slidably arranged 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. Slide holes adapted to the sliding rods 9 are formed in the second mounting plate 8. The sliding rods 9 are connected to the slide holes, and a limiting structure for preventing them from separating from each other is provided therebetween, so that the second mounting plate 8 can slide relative to the first mounting plate 7 in the vertical direction.

[0035] Further, 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 at the top of the pushing portion, the radial dimension of the first flange portion is greater than the radial dimension of the top of the pushing portion, a card slot adapted to the end of the first flange portion is provided on the first limiting frame 10, a second flange portion is provided at the top of the containing portion, the second flange portion protrudes from the outer peripheral surface of the containing portion, a second card slot adapted to 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, which is composed of two arc-shaped plates, and a limiting space adapted to the containing portion is formed between the two arcs, and the snap ring 12 is made of an elastic material. The function of such a setting is that when fixing the syringe 3, first adjust the position of the first flange portion and the position of the first card slot to the same vertical height, and adjust the position of the second flange portion and the position of the second card slot to the same vertical height. At this time, the containing portion is located on the side of the open end of the snap ring 12, and then press the containing portion. Since the snap ring 12 is made of an elastic material, the snap ring 12 is expanded. When the containing portion enters the inner space of the snap ring 12, the snap ring 12 automatically resets under the action of its own elastic force to limit the containing portion in its inner space to achieve the horizontal limit of the containing portion. At the same time, the first flange portion is inserted into the first card slot, and the second flange portion is inserted into the second card slot. Through the insertion action of the first flange portion and the first card slot, the vertical limit of the pushing portion can be achieved. Through the insertion action of the second flange portion and the second card slot, the vertical limit of the containing portion can be achieved. In this way, the syringe 3 can be fixed on the sliding member as a whole. When the syringe 3 is switched from the installation position to the injection position, at this time, the first mounting plate 7 and the second mounting plate 8 move vertically downward, and drive the puncturing portion into the sample introduction 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, control the first mounting plate 7 to continue to move downward. At this time, the first mounting plate 7 moves downward relative to the second mounting plate 8, that is, at this time, the pushing portion slides toward the containing portion to squeeze the space inside the containing portion, so as to inject the sample into the sample introduction portion 33 to achieve passive injection of the sample. When the injection is completed, when controlling the syringe 3 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 portion slides outward of the containing portion, and drives the second mounting plate 8 to lift upward under the action of the limiting structure between the sliding rod 9 and the sliding hole. After the puncturing portion is withdrawn from the sample introduction portion 33, the automatic reset of the syringe 3 is completed, and then provide a force for the syringe 3 to move away from the second mounting plate 8 direction, so as to remove the syringe 3 from the snap ring 12.

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

[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 sliding rods 9. The elastic force of the first spring 13 is greater than the gravity of the second mounting plate 8. The purpose of this setting is that under the action of 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 relative sliding between the first mounting plate 7 and the second mounting plate 8 as much as possible during the sliding process of the sliding part. Also, 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 space inside the containing part can be avoided being squeezed by the pushing part as much as possible, thereby reducing the loss of the sample. And under the connection action of the first spring 13, the second mounting plate 8 can be lifted without moving the sliding rod 9 to the maximum distance, reducing the overall movement stroke of the sliding part.

[0038] It should be noted that when injecting the sample, when the syringe 3 is inserted into the injection part 33, to avoid the syringe 3 being inserted obliquely, the movement of the syringe 3 from the installation position to the injection position is slow. However, after the sample injection is completed, 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. Furthermore, it also includes a first power component for driving the syringe 3 to slowly descend and a second power component for driving the syringe 3 to instantaneously ascend. Specifically, the first power component can be a reciprocating driving component such as a ball screw, and the second power component can be in the form of elastic instantaneous driving. The purpose of this setting is that when the syringe 3 switches from the installation position to the injection position, the first power component drives the sliding part and the syringe 3 to descend, and stores energy for the second power component during the descending process. When the sample in the syringe 3 is injected, the first power component is disconnected from the sliding part. At this time, the elastic force stored by the second power component is instantaneously released, so that the puncture part can be instantaneously 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 fixedly connected to the bracket 2. An abutting block 15 is elastically arranged on the first mounting plate 7. When the syringe 3 descends, the output end of the cylinder 14 abuts against the abutting block 15. Specifically, the cylinder 14 is vertically arranged on the bracket 2. A square hole 16 is formed in the first mounting plate 7, and a movable groove 17 is formed in the side wall of the square hole 16. The abutting block 15 is provided with a wedge surface. There are two abutting blocks 15, which are respectively inverted in the two movable grooves 17. The abutting block 15 is slidably connected to the movable groove 17. The elastic arrangement means that a second spring 18 is arranged between the abutting block 15 and the movable groove 17. The elastic force of the second spring 18 makes one end of the abutting block 15 with the wedge surface inserted into the square hole 16. The function of such an arrangement is that when the output end of the cylinder 14 extends, it will abut against the horizontal surface of the abutting block 15, so that the abutting 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 installation position to the injection position.

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

[0041] Further, the second power assembly further includes a driving spring 20. A butting plate 21 is arranged on the first mounting plate 7, and the driving spring 20 is arranged between the butting plate 21 and the chromatograph body 1. Specifically, the butting plate 21 is a plate-like structure extending from both ends of the first mounting plate 7. One end of the driving spring 20 is fixedly connected to the lower surface of the butting 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 function of such a setting is that when the first power assembly drives the syringe 3 and the sliding member to move downward, the driving spring 20 will be compressed, thereby producing a buffering effect on the syringe 3 and storing energy for the driving spring 20. When the output end of the cylinder 14 is inserted into the gap between the two butting blocks 15, its limiting effect on the butting blocks 15 in the vertical direction disappears. At this time, the elastic force of the driving spring 20 is instantly released, causing the first mounting plate 7 to move upward rapidly, thereby driving the second mounting plate 8 and the syringe 3 to move upward rapidly, so that the puncturing part can be quickly withdrawn from the sample injection part 33. When the first mounting plate 7 moves upward to the maximum value, under the action of the repeated expansion and contraction of the driving spring 20, a shaking effect will be generated on the syringe 3, so that the sample attached to the surface of the syringe 3 can be shaken off, thereby reducing the subsequent cleaning difficulty 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 the driving spring 20 will cause the first mounting plate 7 to move upward first, and then the second mounting plate 8 can be driven to move upward under the connection action of the first spring 13. During this process, the pushing part will move upward relative to the containing part, thereby generating a suction effect on the internal space of the containing part. During this period, part of the sample that has been injected into the sample introduction part 33 will be drawn out of the sample introduction part 33 by the syringe 3, resulting in waste of the sample. As another embodiment of the present invention, a locking block 22 is elastically arranged inside the first mounting plate 7, a locking part 24 is elastically arranged on the locking block 22, a locking hole 25 adapted to the locking part 24 is formed on the second mounting plate 8, and the locking block 22 is in contact with the abutting block 15.Specifically, the locking block 22 is also slidably arranged in the movable groove 17. In this embodiment, one end of the second spring 18 is fixed to the side wall of the movable groove 17, and the other end is fixed to the locking block 22. An L-shaped rod 23 is provided at the bottom of the locking block 22, and 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 provided 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 surface is also provided on the locking block 22, and one end of the abutting block 15 located inside the movable groove 17 abuts against the wedge surface of the locking block 22. Under the action of 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 assembly is switched to the second power assembly. Second, in this process, it will abut against the wedge-shaped surface of the locking block 22, causing the locking block 22 to slide toward the outside of the movable groove 17 and stretch the second spring 18, thereby driving the L-shaped rod 23 and the locking portion 24 to move downward while moving toward the direction of the second mounting plate 8. In this process, the end of the locking portion 24 will abut against the side surface of the second mounting plate 8, so that the locking portion 24 moves toward the direction of the locking block 22. When the abutment block 15 and the abutment rod 19 are completely abutted, the locking block 22 coincides with the locking hole 25, 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. As a result, 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. In this way, 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 of the sampling portion 33, a suction effect will not be generated inside the sampling portion 33, so as to reduce the waste of the sample. After switching to the installation position under the action of 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. This process has the following benefits: first, it drives the locking portion 24 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] There is a detection port 34 provided on the chromatograph body 1. Before detecting a sample, it is necessary to ignite the inside of the detector, and then use a light plate or other structure to be placed at the position of the detection port 34. By observing whether there is fog on the light plate, it can be judged whether the ignition is successful. However, during the process of sample detection, the ignition situation is usually not monitored, so it is impossible to ensure the smooth progress of 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, and a toothed plate 30 is provided on the transmission rod 27, and the gear 29 meshes with the toothed plate 30. Specifically, the monitoring plate 26 is located on 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, a rotating shaft is provided on the rotating frame 31, the monitoring plate 26 and the gear 29 are respectively fixedly connected to both ends of the rotating shaft. A sliding portion is provided at the bottom of the transmission rod 27, a sliding groove adapted to the sliding portion is opened on the chromatograph body 1, and the third spring 28 is provided between the sliding portion and the side wall of the sliding groove. An abutting portion 32 and a toothed plate 30 are respectively provided at both ends of the transmission rod 27, and a wedge-shaped surface is provided on the abutting portion 32. When the syringe 3 is in the installation position, the wedge-shaped surface of the abutting portion 32 is on the movement stroke of the abutting plate 21. When the syringe 3 is in the injection position, the abutting plate 21 abuts against the side surface of the abutting portion 32. The toothed plate 30 is located above the gear 29 and meshes with the gear 29. The function of such a setting is that when the syringe 3 is switched from the installation position to the injection position, it will drive the abutting plate 21 to abut against the wedge-shaped surface of the abutting portion 32, so as to drive the transmission rod 27 and the toothed plate 30 to slide towards the monitoring plate 26, and store energy in the third spring 28, thereby driving the gear 29, the rotating shaft and the monitoring plate 26 to passively rotate towards the detection port 34, so that the monitoring plate 26 rotates to the side of the detection port 34 to monitor the ignition situation. During the subsequent downward movement of the abutting plate 21, it always abuts against the side surface of the abutting portion 32, so that the monitoring plate 26 is kept on the side of the detection port 34. When the syringe 3 is switched from the injection position to the installation position, the abutting plate 21 will move upward. When the abutting plate 21 moves above the abutting portion 32, the elastic force of the third spring 28 is released, thereby driving the transmission rod 27, the abutting portion 32 and the toothed plate 30 to move away from the detection port 34, thereby driving the monitoring plate 26 to rotate in the reverse direction to realize the reset of the monitoring plate 26.

[0044] ​It should be noted that the reason for not always fixing the monitoring board 26 at 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 board 26. On the one hand, when the ignition device malfunctions, the fog on the surface of the monitoring board 26 cannot disperse immediately, so it is easy to cause a lag in the monitoring results. On the other hand, when too much fog accumulates, water droplets will be generated, and after the generated water droplets flow into the detector, it is easy to cause damage to the detector.

[0045] Only some exemplary embodiments of the present invention have been described above by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different 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 on-line chromatograph based on a helium ionization detector, comprising a chromatograph body and an auxiliary sampling mechanism arranged on the chromatograph body, characterized in that, The auxiliary sample injection mechanism includes a bracket arranged on the chromatograph body, and a syringe is slidably arranged on the bracket; A passive injection component is arranged between the bracket and the syringe. During the process of inserting the syringe into the sample injection part, the passive injection component injects the sample inside the syringe into the inside of the sample injection part; An installation groove is formed on the bracket, a slide rail is arranged inside the installation groove, a sliding member is arranged on the slide rail, and the syringe is arranged on the sliding member; The sliding member includes a slider slidably connected to the slide rail; A first mounting plate is fixedly connected to the slider, and two slide bars are fixedly connected to the lower surface of the first mounting plate. Slide holes adapted to the slide bars are formed on the second mounting plate, and the slide bars are connected to the slide holes; 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; The syringe includes a rod-shaped pushing part, a cylindrical containing part and a needle-shaped puncturing part. A first flange part is arranged at the top end of the pushing part, and the radial dimension of the first flange part is larger than the radial dimension of the top end of the pushing part. A clamping groove adapted to the end part of the first flange part is formed on the first limiting frame. A second flange part is arranged at the top end of the containing part, and the second flange part protrudes from the outer peripheral surface of the containing part. A second clamping groove adapted to the second flange part is formed on the second limiting frame; It further includes a first power component for driving the syringe to slowly descend and a second power component for driving the syringe to instantaneously ascend; The first power component includes a cylinder fixedly connected to the bracket. An abutting block is elastically arranged on the first mounting plate. When the syringe descends, the output end of the cylinder abuts against the abutting block; An abutting rod is arranged on the chromatograph body, and the abutting rod is located on the movement stroke of the abutting block; The abutting block is provided with a wedge-shaped surface, and there are two abutting blocks. Two wedge-shaped surfaces are symmetrically arranged at the end of the abutting rod, and the wedge-shaped surface of the abutting rod is located on the movement stroke of the wedge-shaped surface of the abutting block; The second power component further includes a driving spring. An abutting plate is arranged on the first mounting plate, and the driving spring is arranged between the abutting plate and the chromatograph body.

2. The industrial on-line chromatograph based on a helium ionization detector according to claim 1, wherein A first spring is arranged between the first mounting plate and the second mounting plate.

3. The industrial on-line chromatograph based on a helium ionization detector according to claim 1, wherein A locking block is elastically arranged inside the first mounting plate, a locking part is elastically arranged on the locking block, a locking hole adapted to the locking part is formed on the second mounting plate, and the locking block abuts against the abutting block.

Images