An automatic calibration device for gas chromatograph and a special anti-leakage device for zero gas input pipe

Abstract

The invention discloses an automatic calibration device for a gas chromatograph and a special anti-leakage device for a zero gas input pipe, the special anti-leakage device for a zero gas input pipe comprises a zero gas input pipe and a sealing slide pipe, an outer pipe is arranged on the outer side of the zero gas input pipe, a gap is arranged between the outer pipe and the zero gas input pipe, a locking button is arranged on the outer side of the sealing slide pipe, a sealing rope is fixedly arranged on the lower side of the locking button, two ends of the sealing rope are fixed on the lower side of the locking button to form a circle, the zero gas input pipe is sleeved by the circle-shaped sealing rope, both ends of the sealing rope pass through the sealing slide pipe, two locking buttons are symmetrically arranged on one sealing slide pipe, after the operator finds the leakage position, the sealing slide pipe is moved to the leakage point position on the zero gas input pipe, the locking button is rotated, and the sealing rope is tightened to make the zero gas input pipe and the sealing slide pipe tightly connected, so as to achieve the effect of preventing and controlling zero gas leakage.

Description

Technical Field

[0001] The invention relates to the technical field of gas phase analysis and instruments, and in particular to an automatic calibration device applied to a gas chromatograph and a special anti-leakage device for a zero gas input pipe. Background Art

[0002] Gas chromatograph is an instrument that uses chromatographic separation and detection technology to conduct qualitative and quantitative analysis of complex multi-component mixtures. It can usually be used to analyze organic matter in soil that is thermally stable and has a boiling point not exceeding 500°C, such as volatile organic matter, organochlorine, organophosphorus, polycyclic aromatic hydrocarbons, phthalates, etc.

[0003] The existing equipment needs to replace the silicone drying tube after being used for a period of time. When replacing, the connection port of the silicone drying tube needs to be loosened, and then the silicone drying tube needs to be removed for replacement. The replacement process is relatively troublesome, and during replacement, since the pipeline is not connected, impurities from the outside may enter the pipeline, which may cause the instrument to malfunction.

[0004] If the zero gas inlet pipe leaks in existing equipment, serious consequences will occur.

[0005] Therefore, it is necessary to provide an automatic calibration device for gas chromatograph and a gas chromatograph to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide an automatic calibration device for gas chromatograph and a gas chromatograph, so as to solve the problem that the existing automatic calibration device for gas chromatograph and the gas chromatograph in the above-mentioned background technology are inconvenient to replace the drying tube, and the leakage of the zero gas input pipe will produce serious consequences.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A special anti-leakage device for a zero gas input pipe comprises a zero gas input pipe and a sealing slide pipe, an outer pipe is arranged on the outer side of the zero gas input pipe, a gap is arranged between the outer pipe and the zero gas input pipe, a locking button is arranged on the outer side of the sealing slide pipe, a sealing rope is fixedly arranged on the lower side of the locking button, both ends of the sealing rope are fixed on the lower side of the locking button to form a circle, the zero gas input pipe is sleeved by the circle-shaped sealing rope, both ends of the sealing rope pass through the sealing slide pipe, two locking buttons are symmetrically arranged on one sealing slide pipe, after the operator finds the leakage position, the sealing slide pipe is moved to the leakage point position on the zero gas input pipe, the locking button is rotated, and the sealing rope is tightened to make the zero gas input pipe and the sealing slide pipe tightly connected, so as to achieve the effect of preventing and controlling zero gas leakage.

[0009] Preferably, colored zero gas is injected into the gap, and the colored zero gas helps users to find the leakage position on the zero gas input pipe more quickly.

[0010] Preferably, the sealing sliding pipe is sealed at the position where the sealing rope passes through.

[0011] Preferably, the sealing rope is made of steel.

[0012] An automatic calibration device for a gas chromatograph comprises a special anti-leakage device for a zero gas input pipe, a vaporization chamber, a chromatographic column and a detector. The vaporization chamber is connected with a zero gas input pipe, a calibration gas input pipe and a sampling pipe. The vaporization chamber is connected with the detector through the chromatographic column. A replacement device is provided on the zero gas input pipe. A plurality of telescopic drying tubes are provided in the replacement device. The zero gas transmission pipe is connected with one of the telescopic drying tubes. The telescopic drying tube is separated from the zero gas input pipe after shrinkage. The replacement device shrinks the telescopic drying tube by squeezing and moves and replaces the telescopic drying tube by pushing.

[0013] Preferably, the zero air input pipe includes a first zero air pipe and a second zero air pipe, the replacement device includes an upper box body, a lower box body, a pushing mechanism, a compression mechanism and a connecting pipe, the lower box body is fixedly installed on the bottom end of the upper box body, and the upper box body is connected to the lower box body, connecting pipes are fixedly installed on two opposite side walls of the upper box body, the first zero air pipe is connected to one of the connecting pipes, the second zero air pipe is connected to the other connecting pipe, both ends of one of the telescopic drying tubes are respectively connected to the two connecting pipes, the pushing mechanism is arranged at the top of the inner cavity of the upper box body, two compression mechanisms are provided, the two compression mechanisms are respectively fixedly installed on the two opposite side walls of the upper box body, and the two compression mechanisms are respectively located directly above the two connecting pipes.

[0014] Preferably, the connecting pipe is configured to be trumpet-shaped, and a sealing ring is fixedly installed on the inner wall of the connecting pipe.

[0015] Preferably, the pushing mechanism includes a push rod, a slide plate, a first spring, a push plate and a pressure plate. The slide plate is slidably installed on the top of the inner cavity of the upper box body, the push rod is fixedly installed on the top of the slide plate, the top of the push rod extends to the top of the upper box body, and the pressure plate is fixedly installed on the top of the push rod, the first spring is fixedly installed on the bottom end of the slide plate, and the bottom end of the first spring is fixedly connected to the push plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the gas chromatograph of the present invention;

[0018] Figure 2 It is a schematic diagram of the automatic calibration device of the present invention;

[0019] Figure 3 It is a schematic cross-sectional structure diagram of the automatic calibration device of the present invention;

[0020] Figure 4 The present invention Figure 3 A schematic diagram of the enlarged structure at point A;

[0021] Figure 5 The present invention Figure 3 A schematic diagram of the enlarged structure at B;

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure of the telescopic drying tube of the present invention;

[0023] Figure 7 is a schematic cross-sectional structure diagram of the elastic connector of the present invention;

[0024] Figure 8 It is a schematic diagram of the side cross-sectional structure of the gas chromatograph of the present invention;

[0025] Fig. 9 The present invention Figure 8 A schematic diagram of the enlarged structure at C;

[0026] Fig.10 The present invention Fig. 9 A schematic diagram of the structure at D of FIG.

[0027] Fig.11 It is a schematic diagram of the main structure of the special anti-leakage device for zero gas input pipe of the present invention;

[0028] Fig.12 2. It is a front view of the special anti-leakage device for the zero gas input pipe of the present invention;

[0029] Fig.13 is a cross-sectional view of the connection between the outer tube and the zero gas input tube of the present invention;

[0030] Fig.14 It is a cross-sectional view of the connection between the zero gas input pipe and the special anti-leakage device of the zero gas input pipe of the present invention.

[0031] In the figure: 1, gasification chamber; 2, zero gas input pipe; 21, first zero gas pipe; 22, second zero gas pipe; 3, replacement device; 31, upper box body; 32, lower box body; 33, pushing mechanism; 331, push rod; 332, slide plate; 333, first spring; 334, push plate; 335, pressure plate; 336, first piston cylinder; 34, compression mechanism; 341, second piston cylinder; 342, pressure plate; 343, gas pipe; 35, connecting pipe; 36, sealing ring; 4, chromatographic column; 5, detector; 6, telescopic drying tube; 61, first drying tube; 62, second Drying tube; 63, flexible tube; 64, elastic connector; 641, sleeve; 642, second spring; 643, guide column; 65, upper support plate; 66, lower support plate; 7, standard gas input tube; 8, sample injection tube; 9, switch; 10, housing; 11, first baffle; 12, second baffle; 13, motor; 14, rope wheel; 15, traction rope; 16, V-shaped rod; 17, hinge; 18, special anti-leakage device for zero gas input tube; 1801, sealing slide tube; 1802, locking button; 1803, sealing rope; 1804, outer tube; 1805, gap. DETAILED DESCRIPTION

[0032] A zero gas input pipe special anti-leakage device, comprising a zero gas input pipe 2 and a sealing slide pipe 1801, an outer tube 1804 is arranged on the outer side of the zero gas input pipe 2, a gap 1805 is arranged between the outer tube 1804 and the zero gas input pipe 2, a locking button 1802 is arranged on the outer side of the sealing slide pipe 1801, a sealing rope 1803 is fixedly arranged on the lower side of the locking button 1802, and both ends of the sealing rope 1803 are fixed to the lower side of the locking button 1802 from The zero gas input pipe 2 is circled and is covered with the circled sealing rope 1803. Both ends of the sealing rope 1803 pass through the sealing sliding tube 1801. Two locking buttons 1802 are symmetrically arranged on one sealing sliding tube 1801. After the operator finds the leakage position, the sealing sliding tube is moved to the leakage point on the zero gas input pipe, and the locking button is rotated to tighten the sealing rope so that the zero gas input pipe is tightly connected with the sealing sliding tube to achieve the effect of preventing and controlling zero gas leakage.

[0033] Specifically, colored zero gas is injected into the gap 1805, and the colored zero gas helps users to find the leakage position on the zero gas input pipe more quickly.

[0034] Specifically, the sealing sliding pipe 1801 is sealed at the position where the sealing rope 1803 passes through.

[0035] Preferably, the sealing rope 1803 is made of steel.

[0036] An automatic calibration device for a gas chromatograph comprises a zero gas input pipe special anti-leakage device 18, a vaporization chamber 1, a chromatographic column 4 and a detector 5. The vaporization chamber 1 is connected with a zero gas input pipe 2, a calibration gas input pipe 7 and an injection pipe 8. The vaporization chamber 1 is connected with the detector 5 through the chromatographic column 4. The zero gas input pipe 2 is provided with a replacement device 3. A plurality of telescopic drying tubes 6 are provided in the replacement device 3. The telescopic drying tubes 6 can be separated from the zero gas input pipe 2 after contraction. The replacement device 3 replaces the telescopic drying tubes 6 by squeezing and pushing.

[0037] When used specifically, the components in the zero gas can be separated by the chromatographic column 4, and the components in the zero gas can be detected by the detector 5. During calibration, firstly, zero gas is input into the vaporization chamber 1, and the zero gas is input into the detector 5 through the chromatographic column 4. Since the zero gas does not contain the detection component, the data detected by the detector 5 should be zero. Then, standard gas is input into the detector 5. The standard gas is a gas containing specific components. The data detected by the detector 5 should be consistent with the values ​​of the contents of each component in the standard gas. When the detection values ​​of the zero gas and the standard gas are accurate, the calibration of the gas chromatograph is completed. When the detection values ​​are inaccurate, the parameters of the detector 5 are adjusted to be consistent. The moisture in the zero gas can be dried by the telescopic drying tube 6, and the telescopic drying tube 6 can be replaced by the replacement device 3. When replacing, the telescopic drying tube 6 in use and the telescopic drying tube 6 above it are first compressed by the replacement device 3, and then all the telescopic drying tubes 6 are pushed by the replacement device 3. The telescopic drying tube 6 in use is pushed out of the working position to separate it from the zero gas input pipe 2, and the telescopic drying tube 6 above it is pushed into the working position to connect it with the zero gas input pipe 2, so as to realize the rapid replacement of the telescopic drying tube 6 and avoid the impurities entering the zero gas input pipe 2 and causing instrument failure due to the long replacement time of the telescopic drying tube 6.

[0038] Specifically, the zero gas input pipe 2 includes a first zero gas pipe 21 and a second zero gas pipe 22, the replacement device 3 includes an upper box body 31, a lower box body 32, a pushing mechanism 33, a compression mechanism 34 and a connecting pipe 35, the lower box body 32 is fixedly installed at the bottom end of the upper box body 31, and the upper box body 31 is connected to the lower box body 32, and the two opposite side walls of the upper box body 31 are fixedly installed with connecting pipes 35, the first zero gas pipe 21 is connected to one of the connecting pipes 35, and the second zero gas pipe 22 is connected to the other connecting pipe 35, and the two ends of one of the telescopic drying tubes 6 are respectively connected to the two connecting pipes 35, the pushing mechanism 33 is arranged at the top of the inner cavity of the upper box body 31, and two compression mechanisms 34 are provided, and the two compression mechanisms 34 are respectively fixedly installed on the two opposite side walls of the upper box body 31, and the two compression mechanisms 34 are respectively located directly above the two connecting pipes 35.

[0039] The connecting pipe 35 is configured to be trumpet-shaped, and a sealing ring 36 is fixedly installed on the inner wall of the connecting pipe 35 .

[0040] The pushing mechanism 33 includes a push rod 331, a slide plate 332, a first spring 333, a push plate 334, a pressure plate 335 and a first piston cylinder 336. The slide plate 332 is slidably mounted on the top of the inner cavity of the upper box body 31. The top of the slide plate 332 is fixedly mounted with a push rod 331, the top of the push rod 331 extends to the top of the upper box body 31, and the top of the push rod 331 is fixedly mounted with a pressure plate 335. The bottom end of the slide plate 332 is fixedly mounted with a first spring 333, the bottom end of the first spring 333 is fixedly connected to the push plate 334, two first piston cylinders 336 are provided, and the first piston cylinders 336 are fixedly mounted on the top of the push plate 334, and the output end of the first piston cylinder 336 is fixedly connected to the bottom end of the slide plate 332.

[0041] The compression mechanism 34 includes a second piston cylinder 341, a pressure plate 342 and an air pipe 343. The second piston cylinder 341 is fixedly installed on the side wall of the upper box body 31, and the second piston cylinder 341 is located directly above the connecting pipe 35. The output end of the second piston cylinder 341 passes through the side wall of the upper box body 31, and the pressure plate 342 is fixedly installed on the output end of the second piston cylinder 341. One end of the air pipe 343 is connected to the end of the second piston cylinder 341 away from the pressure plate 342, and the other end of the air pipe 343 is connected to the bottom of the first piston cylinder 336. The output end of the first piston cylinder 336 is opposite to the output end of the second piston cylinder 341 in telescopic state, that is, when the output end of the first piston cylinder 336 is telescopic, the output end of the second piston cylinder 341 is in a contracted state, and when the output end of the first piston cylinder 336 is extended, the output end of the second piston cylinder 341 is in an extended state.

[0042] During specific use, when the telescopic drying tube 6 needs to be replaced, the pressure plate 335 is first pressed. The pressure plate 335 drives the slide plate 332 to move downward through the push rod 331. When the slide plate 332 moves downward, it drives the first spring 333 to be compressed. At the same time, it drives the output end of the first piston cylinder 336 to contract, so that the gas in the first piston cylinder 336 is input into the second piston cylinder 341 through the gas pipe 343, so that the output end of the second piston cylinder 341 extends, thereby pushing the pressure plate 342 to move. The two pressure plates 342 compress the telescopic drying tube 6 between them. At the same time, when the telescopic drying tube 6 is compressed, it drives the telescopic drying tube 6 below it to be compressed. After compression, the telescopic drying tube 6 below is separated from the two connecting tubes 35. After the telescopic drying tube 6 is separated from the connecting tube 35, the elastic force of the first spring 333 Under the action, the push plate 334 moves downward, thereby pushing all the telescopic drying tubes 6 to move downward, so that the telescopic drying tube 6 located in the working position falls into the lower box body 32, and the telescopic drying tube 6 above it moves between the two connecting tubes 35, and stretches under the action of its own elastic force, so that its two ends enter the connecting tube 35, thereby connecting the two connecting tubes 35. At the same time, when the push plate 334 moves downward, the output end of the first piston cylinder 336 extends out, so that the gas in the second piston cylinder 341 is sucked into the first piston cylinder 336 through the air supply pipe 343, so that the output end of the second piston cylinder 341 contracts, thereby realizing the resetting of the pressure plate 342. The telescopic drying tube 6 can be compressed and pushed only by pressing the pressure plate 335. The operation is simple, and the replacement speed of the telescopic drying tube 6 is improved.

[0043] Specifically, the telescopic drying tube 6 includes a first drying tube 61, a second drying tube 62, a flexible tube 63 and an elastic connector 64. The first drying tube 61 and the second drying tube 62 are preferably silicone drying tubes. The first drying tube 61 and the second drying tube 62 are connected through the flexible tube 63. The ends of the first drying tube 61 and the second drying tube 62 away from the flexible tube 63 are both set to be sharp. A plurality of elastic connectors 64 are connected between the first drying tube 61 and the second drying tube 62. Upper support plates 65 are fixedly installed at the top ends of the first drying tube 61 and the second drying tube 62. Lower support plates 66 are fixedly installed at the bottom ends of the first drying tube 61 and the second drying tube 62. The distance between the two upper support plates 65 away from the side walls of the flexible tube 63 is smaller than the distance between the two lower support plates 66 close to the side walls of the flexible tube 63.

[0044] The elastic connecting member 64 includes a sleeve 641, a second spring 642 and a guide column 643. The second spring 642 is fixedly installed in the sleeve 641, and the guide column 643 is slidably installed in the sleeve 641. One end of the guide column 643 located in the sleeve 641 is fixedly connected to the second spring 642, one end of the sleeve 641 away from the second drying tube 62 is fixedly connected to the first drying tube 61, and one end of the guide column 643 away from the first drying tube 61 is fixedly connected to the second drying tube 62.

[0045] During specific use, under the action of the flexible tube 63 and the elastic connector 64, the first drying tube 61 and the second drying tube 62 can be close to or away from each other, and when the first drying tube 61 and the second drying tube 62 are close to each other due to an external force, the elastic connector 64 is in a compressed state. After the external force is lost, under the elastic force of the elastic connector 64, the first drying tube 61 and the second drying tube 62 are away from each other. Since the two upper support plates 65 are located between the two nearest lower support plates 66, the telescopic drying tube 6 above can drive the telescopic drying tube 6 below to shrink synchronously when it shrinks.

[0046] Specifically, a gas chromatograph comprises a shell 10 and the above-mentioned automatic calibration device, wherein the automatic calibration device is fixedly installed on one side of the top of the shell 10, a first baffle 11 is rotatably installed on the top of the front wall of the shell 10, and a second baffle 12 is rotatably installed on the side wall of the shell 10 close to the first baffle 11, a motor 13 is fixedly installed in the shell 10, the motor 13 is located between the first baffle 11 and the second baffle 12, and the height of the motor 13 is higher than the height of the first baffle 11 and the second baffle 12, a rope winding wheel 14 is fixedly installed on the output end of the motor 13, the rope winding wheel 14 is drivingly connected to the second baffle 12 through a traction rope 15, and a V-shaped rod 16 is fixedly installed on the side wall of the rope winding wheel 14 away from the motor 13, and the end of the V-shaped rod 16 away from the rope winding wheel 14 is drivingly connected to the first baffle 11 through a hinge 17.

[0047] A switch 9 is fixedly mounted on the top of the housing 10 , and the switch 9 is electrically connected to the motor 13 . The pressure plate 335 is located above the housing 10 , and the switch 9 is located below the pressure plate 335 .

[0048] During specific use, after the telescopic drying tube 6 stored in the upper box body 31 is used up, the pressure plate 335 is pressed down so that the pressure plate 335 just contacts the switch 9. After the switch 9 is pressed, the motor 13 is turned on. The output end of the motor 13 drives the rope winding wheel 14 to rotate, so that the traction rope 15 is wound around the rope winding wheel 14. The traction rope 15 pulls the second baffle 12 to open. At the same time, the rotation of the rope winding wheel 14 drives the V-shaped rod 16 to rotate. When the V-shaped rod 16 rotates, the first baffle 11 is pushed open by the hinge 17. Then a new telescopic drying tube 6 can be placed in the upper box body 31. Through this structure, the first baffle 11 and the second baffle 12 can be automatically opened after the telescopic drying tube 6 stored in the upper box body 31 is used up, so as to avoid forgetting to add the telescopic drying tube 6, thereby improving the convenience of use.

[0049] Working principle: When the telescopic drying tube 6 needs to be replaced, first press the pressure plate 335, and the pressure plate 335 drives the slide plate 332 to move downward through the push rod 331. When the slide plate 332 moves downward, it drives the first spring 333 to be compressed, and at the same time, drives the output end of the first piston cylinder 336 to contract, so that the gas in the first piston cylinder 336 is input into the second piston cylinder 341 through the gas pipe 343, so that the output end of the second piston cylinder 341 extends, thereby pushing the pressure plate 342 to move, and the two pressure plates 342 compress the telescopic drying tube 6 between them. At the same time, when the telescopic drying tube 6 is compressed, the telescopic drying tube 6 below it is compressed. After the telescopic drying tube 6 below is compressed, it is separated from the two connecting tubes 35. After the telescopic drying tube 6 is separated from the connecting tube 35 Under the elastic force of the first spring 333, the push plate 334 moves downward, thereby pushing all the telescopic drying tubes 6 to move downward, so that the telescopic drying tube 6 located at the working position falls into the lower box body 32, and the telescopic drying tube 6 above it moves between the two connecting tubes 35 and stretches under the action of its own elastic force, so that its two ends enter the connecting tube 35, thereby connecting the two connecting tubes 35. At the same time, when the push plate 334 moves downward, the output end of the first piston cylinder 336 extends out, thereby sucking the gas in the second piston cylinder 341 into the first piston cylinder 336 through the gas supply pipe 343, so that the output end of the second piston cylinder 341 contracts, thereby realizing the reset of the pressing plate 342. Under the action of the flexible tube 63 and the elastic connector 64, the first dry The drying tube 61 and the second drying tube 62 can be close to or away from each other, and when the first drying tube 61 and the second drying tube 62 are close to each other due to external force, the elastic connector 64 is in a compressed state. After the external force is lost, the first drying tube 61 and the second drying tube 62 are away from each other under the elastic force of the elastic connector 64. Since the two upper support plates 65 are located between the two nearest lower support plates 66, the upper telescopic drying tube 6 can drive the telescopic drying tube 6 below to shrink synchronously when it shrinks. When the telescopic drying tube 6 stored in the upper box body 31 is used up, the pressure plate 335 is pressed down and just contacts the switch 9. After the switch 9 is pressed, the motor 13 is turned on, and the output end of the motor 13 drives the rope wheel 14 to rotate, so that the traction rope 15 is wound On the rope wheel 14, the traction rope 15 pulls the second baffle 12 to open. At the same time, the rotation of the rope wheel 14 drives the V-shaped rod 16 to rotate. When the V-shaped rod 16 rotates, the first baffle 11 is pushed open by the hinge 17. Then the new telescopic drying tube 6 can be placed in the upper box body 31. Through this structure, the first baffle 11 and the second baffle 12 can be automatically opened after the telescopic drying tube 6 stored in the upper box body 31 is used up, so as to avoid forgetting to add the telescopic drying tube 6 and improve the convenience of use. When the zero gas input pipe leaks, the operator finds the leaking position, moves the sealing slide pipe to the leaking point on the zero gas input pipe, rotates the locking button, and tightens the sealing rope to make the zero gas input pipe and the sealing slide pipe tightly connected, so as to achieve the effect of preventing and controlling zero gas leakage.

Claims

1. An automatic calibration device for a gas chromatograph, characterized in that: It comprises a special anti-leakage device for a zero gas input pipe, the special anti-leakage device for a zero gas input pipe comprises a zero gas input pipe and a sealing slide pipe, an outer tube is arranged on the outer side of the zero gas input pipe, a gap is arranged between the outer tube and the zero gas input pipe, a locking button is arranged on the outer side of the sealing slide pipe, a sealing rope is fixedly arranged on the lower side of the locking button, both ends of the sealing rope are fixed on the lower side of the locking button to form a circle, the zero gas input pipe is sleeved by the circle-shaped sealing rope, both ends of the sealing rope pass through the sealing slide pipe, and two locking buttons are symmetrically arranged on one sealing slide pipe; Colored zero gas is injected into the gap; The sealing sliding pipe is sealed at the position where the sealing rope passes through; The sealing rope is made of steel; It also includes a vaporization chamber, a chromatographic column and a detector. The vaporization chamber is connected with a zero gas input pipe, a standard gas input pipe and a sampling pipe. The vaporization chamber is connected with the detector through the chromatographic column. A replacement device is provided on the zero gas input pipe. A plurality of telescopic drying tubes are provided in the replacement device. The zero gas input pipe is connected with one of the telescopic drying tubes. The telescopic drying tube is separated from the zero gas input pipe after shrinkage. The replacement device shrinks the telescopic drying tube by squeezing and moves and replaces the telescopic drying tube by pushing. The zero air input pipe includes a first zero air pipe and a second zero air pipe, the replacement device includes an upper box body, a lower box body, a pushing mechanism, a compression mechanism and a connecting pipe, the lower box body is fixedly installed on the bottom end of the upper box body, and the upper box body is connected to the lower box body, and the two opposite side walls of the upper box body are fixedly installed with connecting pipes, the first zero air pipe is connected to one of the connecting pipes, and the second zero air pipe is connected to the other connecting pipe, and the two ends of one of the telescopic drying pipes are respectively connected to the two connecting pipes, the pushing mechanism is arranged at the top of the inner cavity of the upper box body, and the two compression mechanisms are provided, and the two compression mechanisms are respectively fixedly installed on the two opposite side walls of the upper box body, and the two compression mechanisms are respectively located directly above the two connecting pipes; The pushing mechanism includes a push rod, a slide plate, a first spring, a push plate and a pressure plate. The slide plate is slidably mounted on the top of the inner cavity of the upper box body. The top of the slide plate is fixedly mounted with a push rod, the top of the push rod extends to the top of the upper box body, and the top of the push rod is fixedly mounted with a pressure plate. The bottom end of the slide plate is fixedly mounted with a first spring, and the bottom end of the first spring is fixedly connected with the push plate. The pushing mechanism further includes a first piston cylinder, two of which are provided and fixedly mounted on the top of the push plate, and an output end of the first piston cylinder is fixedly connected to the bottom end of the slide plate; The compression mechanism includes a second piston cylinder, a pressure plate and an air supply pipe. The second piston cylinder is fixedly mounted on the side wall of the upper box body, and the second piston cylinder is located directly above the connecting pipe. The output end of the second piston cylinder passes through the side wall of the upper box body, and a pressure plate is fixedly mounted on the output end of the second piston cylinder. One end of the air supply pipe is connected to an end of the second piston cylinder away from the pressure plate, and the other end of the air supply pipe is connected to the bottom of the first piston cylinder. The output end of the first piston cylinder and the output end of the second piston cylinder have opposite telescopic states.

2. The automatic calibration device for gas chromatograph according to claim 1, characterized in that: The connecting pipe is configured to be trumpet-shaped, and a sealing ring is fixedly installed on the inner wall of the connecting pipe.

Images