CN115876408A

CN115876408A - Gas chromatograph with protection architecture

Info

Publication number: CN115876408A
Application number: CN202211712139.XA
Authority: CN
Inventors: 冯学龙; 陈凯; 向雪
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-03-31

Abstract

The invention discloses a gas chromatograph with a protection structure, which comprises a hydrogen generator, a chromatograph and a first communication pipe, wherein the hydrogen generator is communicated with the chromatograph through the first communication pipe, a valve is arranged on the first communication pipe, the hydrogen generator is used for providing hydrogen for the chromatograph, the first sensor and the second sensor are flow velocity sensors, a support plate is provided with a detection mechanism, the detection mechanism comprises a lifting assembly and a detection barrel, the lifting assembly comprises a motor I, a screw rod, a first guide pillar, a first guide sleeve and a second guide sleeve, the motor I drives the detection barrel to move downwards, so that the detection barrel and the communication pipe are coaxially arranged, then a rubber pad at the opening end of the detection barrel is matched and arranged in a containing groove at the exhaust end part of the first communication pipe, so that the detection barrel is communicated with the first communication pipe, the sealing performance of the connection between the detection barrel and the first communication pipe can be ensured when the rubber pad is arranged in the containing groove, and a detection assembly for detecting the gas leakage part of the first communication pipe is arranged in the detection barrel.

Description

Gas chromatograph with protection architecture

Technical Field

The invention relates to the technical field of gas chromatographs, in particular to a gas chromatograph with a protection structure.

Background

The gas chromatograph is an instrument for qualitatively and quantitatively analyzing a multi-component complex mixture by using a chromatographic separation technology and a detection technology, can be generally used for analyzing organic matters which are thermally stable in soil and have boiling points not higher than 500 ℃, such as volatile organic matters, organic chlorine, organic phosphorus, polycyclic aromatic hydrocarbons, phthalate ester and the like, has various types and different functions, but has similar basic structures, generally consists of a gas path system, a sample introduction system, a separation system, a detection and temperature control system and a recording system, is a chromatographic analysis method taking gas as a mobile phase and is mainly used for separating and analyzing volatile substances, becomes one of extremely important separation and analysis methods, and is widely applied in the fields of medicine and health, petrochemical industry, environmental monitoring, biochemistry and the like, and has the following characteristics that: high sensitivity, high efficiency, high selectivity, fast analysis speed, less required sample amount, wide application range and the like. The gas chromatograph needs the hydrogen generator to provide hydrogen, but the vent pipe of the hydrogen generator is easy to leak after being used for a long time, and the leak of the vent pipe needs to be repaired, so that the gas chromatograph is protected from leaking.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a gas chromatograph with a protection structure.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.

A gas chromatograph with a protective structure, comprising:

the hydrogen generator is communicated with the chromatograph through a first communicating pipe, a valve is arranged on the first communicating pipe, the hydrogen generator is used for providing hydrogen for the chromatograph, a first sensor and a second sensor are arranged in the first communicating pipe, the first sensor and the second sensor are respectively close to an air inlet end and an air outlet end of the first communicating pipe, the first sensor and the second sensor are flow velocity sensors, the air outlet end of the first communicating pipe extends into the chromatograph, a supporting plate is vertically arranged in the chromatograph, a detection mechanism is arranged on the supporting plate and comprises a lifting assembly and a detection barrel body, the lifting assembly comprises a first motor, a first lead screw, a first guide pillar, a first guide sleeve and a second guide sleeve, the first motor is installed at the top of the supporting plate, an output shaft of the first motor is vertically downward, the detection barrel is horizontally arranged, the bottom of the first guide sleeve and the wall of the detection barrel are fixedly connected, the top of the first guide sleeve vertically extends upward, one end of the lead screw is coaxially and fixedly connected with an output shaft end of the first motor, the other end of the lead screw extends into the first guide sleeve, the first guide pillar is arranged on one side of the lead screw in parallel, the end portion of the first guide pillar extends into the second guide sleeve, one end of the detection barrel is opened, the other end of the detection barrel is provided with a blocking plate in a matched mode and is a closed end, the caliber of the detection barrel is identical to that of the first communication pipe, the central axis of the detection barrel is parallel to the central axis of the first communication pipe, the central axis of the detection barrel is located right above the central axis of the first communication pipe, the open end of the detection barrel is close to the exhaust end of the first communication pipe, the exhaust end of the first communication pipe is provided with a containing groove, the open end of the detection barrel is provided with a rubber pad matched with the containing groove, and a detection assembly for detecting the air leakage position of the first communication pipe.

As the further improvement of this technical scheme, the determine module includes motor two, the apparatus further comprises a rotating shaft, bevel gear one, the extension board, the flabellum, bevel gear two, the lantern ring, centrifugal telescopic link, motor two is installed in the wall portion that detects the barrel, the output shaft of motor two is the level and arranges, the one end of pivot and the coaxial fixed connection of output shaft end of motor two, the other end pass detect the wall portion of barrel and with detect between the wall portion of barrel rotate and be connected, extension board vertical fixation sets up in detecting the barrel, the flabellum rotates and installs on the extension board, the central shaft end of flabellum is located to the coaxial fixed cover of bevel gear two, bevel gear one meshes with bevel gear two, the tip of pivot is located to the lantern ring fixed cover, centrifugal telescopic link connects on the anchor ring of the lantern ring, centrifugal telescopic link is provided with a plurality ofly and evenly encircles on the anchor ring of the lantern ring.

As a further improvement of the technical scheme, a first through hole is formed in a plugging plate for detecting the closed end of the barrel body, a wall portion for detecting the barrel body is provided with an opening and closing assembly, the opening and closing assembly comprises a second guide pillar, a push plate, a connecting plate and a baffle plate, the second guide pillar is vertically arranged on the wall portion for detecting the barrel body, the second guide pillar is provided with two guide pillars and is arranged in parallel, the top of the second guide pillar is provided with an external step, the push plate is horizontally arranged and is located on one side of the detection barrel body, the push plate is sleeved on the second guide pillar through the connecting plate, a first spring is sleeved on the second guide pillar, one end of the first spring is in contact with the external step at the top of the second guide pillar, the other end of the first spring is in contact with the plate surface of the connecting plate, the baffle plate is vertically connected to the end of the push plate, the baffle plate is tightly attached to the plugging plate for detecting the closed end of the barrel body, the baffle plate is a rubber plate, a second through hole is formed in the position below the first through hole, and the bottom of the push plate is in contact with the end of a centrifugal telescopic rod.

As a further improvement of the technical scheme, a connecting shell is arranged above the detection barrel, the connecting shell is a cuboid shell with one open end and the other closed end, the connecting shell is communicated with the detection barrel through a communicating pipe, a storage shell is arranged above the connecting shell, the storage shell is communicated with the connecting shell through a communicating pipe, the communicating pipe is close to one end of the connecting shell in the length direction, the communicating pipe is close to the other end of the connecting shell in the length direction, a feeding component is arranged in the connecting shell and comprises a support block, a feeding block and a guide pillar III, the support block is arranged on the wall of the connecting shell and close to the open end of the connecting shell, one end of the guide pillar III is fixedly connected with the support block, the other end of the guide pillar III is provided with an external step, the guide pillar III is parallel to the connecting shell in the length direction, the feeding block is inserted into the connecting shell in a matching mode, one end of the feeding block is sleeved on the guide pillar III through a connecting lug, a spring II is sleeved on the guide pillar III, one end of the spring II is in contact with the support block, the other end of the feeding block is in contact with a connecting lug on the feeding block, a feeding groove is formed in the feeding groove, the feeding groove is located right above the colored gas storage shell, and the colored gas storage shell.

As a further improvement of the technical scheme, the upper plate surface of the push plate is fixedly provided with a push block, and the upper end surface of the push block is obliquely arranged and is contacted with the end part of the feeding block.

Compared with the prior art, the invention has the advantages that in the using process, when hydrogen is required to be provided for the chromatograph, the valve is opened, the hydrogen circulates through the first communicating pipe, when the first communicating pipe is subjected to gas leakage detection, the first motor drives the detection cylinder to move downwards, so that the detection cylinder and the first communicating pipe are coaxially arranged, then the rubber pad at the opening end of the detection cylinder is matched and arranged in the accommodating groove at the exhaust end part of the first communicating pipe, so that the detection cylinder is communicated with the first communicating pipe, the circulation of the hydrogen is kept, two hydrogen flow rates are monitored through the first sensor and the second sensor, if the hydrogen flow rate monitored by the second sensor is smaller than the hydrogen flow rate monitored by the first sensor, the first communicating pipe has a gas leakage phenomenon, then the gas leakage part of the first communicating pipe is detected, and colored gas can be dispersed through the gas leakage part on the wall part of the detection cylinder when the detection cylinder circulates, so that the gas leakage part of the detection cylinder can be conveniently observed, and the gas leakage part of the detection cylinder is timely maintained and protected for the gas chromatograph.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the hydrogen generator and chromatograph of the present invention.

FIG. 3 is a schematic view of the detection mechanism of the present invention.

FIG. 4 is a schematic view of the detection cartridge installation of the present invention.

FIG. 5 is a schematic view of a detection assembly of the present invention.

Fig. 6 is a schematic view of the baffle installation of the present invention.

Fig. 7 is a schematic view of the attachment housing of the present invention.

FIG. 8 is a schematic view of a feed assembly of the present invention.

Fig. 9 is a schematic view of the baffle plate and the plugging plate of the present invention.

Fig. 10 is a schematic view of the baffle and the plugging plate of the present invention.

Labeled as:

10. a hydrogen generator; 110. a first communicating pipe; 111. a first sensor; 112. a second sensor; 113. a containing groove; 120. a valve;

20. a chromatograph; 210. a support plate;

30. a detection mechanism; 310. a lifting assembly; 311. a first motor; 312. a screw rod; 313. a first guide post; 314. a first guide sleeve; 315. a second guide sleeve; 320. detecting the cylinder; 321. a rubber pad; 322. a plugging plate; 323. a first through hole; 330. a detection component; 331. a second motor; 332. a rotating shaft; 333. a first bevel gear; 334. a support plate; 335. a fan blade; 336. a second bevel gear; 337. a collar; 338. a centrifugal telescopic rod; 340. an opening and closing assembly; 341. a second guide post; 342. pushing the plate; 343. a connecting plate; 344. a baffle plate; 345. a second through hole; 346. a push block; 350. a storage housing; 360. connecting the shell; 361. a second communicating pipe; 362. a third communicating pipe; 370. a feeding assembly; 371. supporting a block; 372. a feeding block; 373. a feed chute; 374. and a third guide pillar.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between components, is to be understood broadly, for example, as being either fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-10, a gas chromatograph with a protective structure includes:

the hydrogen generator 10, the chromatograph 20 and the first communicating pipe 110 are communicated with the chromatograph 20 through the first communicating pipe 110, the first communicating pipe 110 is provided with a valve 120, the hydrogen generator 10 is used for providing hydrogen to the chromatograph 20, the first communicating pipe 110 is internally provided with a first sensor 111 and a second sensor 112, the first sensor 111 and the second sensor 112 are respectively close to an air inlet end and an air outlet end of the first communicating pipe 110, the first sensor 111 and the second sensor 112 are flow velocity sensors, the air outlet end of the first communicating pipe 110 extends into the chromatograph 20, the chromatograph 20 is vertically provided with a support plate 210, the support plate 210 is provided with a detection mechanism 30, the detection mechanism 30 comprises a lifting assembly 310 and a detection cylinder 320, the lifting assembly 310 comprises a first motor 311, a screw 312, a first guide pillar 313, a first guide sleeve 314 and a second guide sleeve 315, the first motor 311 is mounted at the top of the support plate 210, the output shaft of the first motor 311 is vertically downward, the detection cylinder 320 is horizontally arranged, the bottoms of the first guide sleeve 314 and the second guide sleeve 315 are fixedly connected with the wall part of the detection cylinder 320, the top of the first guide sleeve 314 and the second guide sleeve 315 vertically extends upward, one end of the screw rod 312 is coaxially and fixedly connected with the output shaft end of the first motor 311, the other end of the screw rod 312 extends into the first guide sleeve 314, the first guide post 313 is arranged on one side of the screw rod 312 in parallel, the end part of the first guide post 313 extends into the second guide sleeve 315, one end of the detection cylinder 320 is opened, the other end of the detection cylinder 320 is provided with a blocking plate 322 in a matching manner and is a closed end, the caliber of the detection cylinder 320 is the same as that of the first communication pipe 110, the central axis of the detection cylinder 320 is parallel to the central axis of the first communication pipe 110, the central axis of the detection cylinder 320 is positioned right above the central axis of the first communication pipe 110, the open end of the detection cylinder 320 is close to the exhaust end of the first communication pipe 110, and the exhaust end part of the first communication pipe 110 is provided with an accommodating groove 113, the containing groove 113 is an annular groove, the open end of the detection cylinder 320 is provided with a rubber pad 321 matched with the containing groove 113, the motor one 311 drives the detection cylinder 320 to move downwards, so that the detection cylinder 320 and the communication pipe one 110 are coaxially arranged, then the rubber pad 321 at the open end of the detection cylinder 320 is matched and arranged in the containing groove 113 at the exhaust end part of the communication pipe one 110, so that the detection cylinder 320 is communicated with the communication pipe one 110, the sealing performance of the communication between the detection cylinder 320 and the communication pipe one 110 can be ensured when the rubber pad 321 is arranged in the containing groove 113, and the detection assembly 330 for detecting the gas leakage part of the communication pipe one 110 is arranged in the detection cylinder 320.

More specifically, the detecting component 330 includes a second motor 331, a rotating shaft 332, a first bevel gear 333, a support plate 334, a fan blade 335, a second bevel gear 336, a lantern ring 337, and a centrifugal telescopic rod 338, where the second motor 331 is installed on the wall of the detecting cylinder 320, the output shaft of the second motor 331 is horizontally arranged, one end of the rotating shaft 332 is coaxially and fixedly connected with the output shaft end of the second motor 331, the other end of the rotating shaft passes through the wall of the detecting cylinder 320 and is rotatably connected with the wall of the detecting cylinder 320, the support plate 334 is vertically and fixedly disposed in the detecting cylinder 320, the fan blade 335 is rotatably installed on the support plate 334, the second bevel gear 336 is coaxially and fixedly sleeved on the central shaft end of the fan blade 335, the first bevel gear 333 is engaged with the second bevel gear 336, the lantern ring 337 is fixedly sleeved on the end of the rotating shaft 332, the centrifugal telescopic rod 338 is connected to the annular surface of the lantern ring 337, and the centrifugal telescopic rod 338 is provided with a plurality of blades and uniformly wound around the annular surface of the lantern ring 337.

More specifically, a first through hole 323 is formed in the blocking plate 322 at the closed end of the detection cylinder 320, a second opening and closing assembly 340 is arranged on the wall of the detection cylinder 320, the opening and closing assembly 340 includes a second guide pillar 341, a push plate 342, a connecting plate 343 and a baffle 344, the second guide pillar 341 is vertically arranged on the wall of the detection cylinder 320, the second guide pillar 341 is provided with two parallel guide pillars, the top of the second guide pillar 341 is provided with an external step, the push plate 342 is horizontally arranged and located at one side of the detection cylinder 320, the push plate 342 is sleeved on the second guide pillar 341 through the connecting plate 343, the second guide pillar 341 is sleeved with a first spring, one end of the first spring is in contact with the external step at the top of the second guide pillar 341, the other end of the connecting plate 343 is vertically connected to the end of the push plate 342, the baffle 344 is tightly attached to the blocking plate 322 at the closed end of the detection cylinder 320, the baffle 344 is a rubber plate, and a second through hole 345 is formed in the baffle 344, the second through hole 345 is located below the first through hole 323, the bottom of the push plate 342 contacts with the end of the centrifugal telescopic rod 338, when hydrogen needs to be provided to the chromatograph 20, the valve 120 is opened, the hydrogen circulates through the first communication pipe 110, and when gas leakage detection is performed on the first communication pipe 110, the first motor 311 drives the detection cylinder 320 to move down, so that the detection cylinder 320 and the first communication pipe 110 are coaxially arranged, then the rubber gasket 321 at the opening end of the detection cylinder 320 is arranged in the accommodating groove 113 at the exhaust end of the first communication pipe 110 in a matching manner, so that the detection cylinder 320 is communicated with the first communication pipe 110, the second motor 331 is started, the output shaft of the second motor 331 rotates to drive the rotating shaft 332 to rotate, so that the first bevel gear 333 rotates, then the second bevel gear 336 and the fan blade 335 rotate, so that hydrogen in the hydrogen generator 10 is extracted, the rotating shaft 332 rotates to drive the lantern ring 337 to rotate, so that the centrifugal telescopic rod 338 is driven to extend, the second through hole 345 on the baffle 344 is overlapped with the first through hole 323 on the blocking plate 322, so that hydrogen circulation is kept, the hydrogen flow rate is monitored through the first sensor 111 and the second sensor 112, if the hydrogen flow rate monitored by the second sensor 112 is smaller than the hydrogen flow rate monitored by the first sensor 111, it is indicated that the first communicating pipe 110 has a gas leakage phenomenon, and then the gas leakage position of the first communicating pipe 110 is checked.

As shown in fig. 6-10, a connecting housing 360 is disposed above the detecting cylinder 320, the connecting housing 360 is a rectangular parallelepiped housing with an open end and a closed end, the connecting housing 360 is communicated with the detecting cylinder 320 via a third communicating pipe 362, a storage housing 350 is disposed above the connecting housing 360, the storage housing 350 is communicated with the connecting housing 360 via a second communicating pipe 361, the second communicating pipe 361 is close to one end of the connecting housing 360 in the length direction, the third communicating pipe 362 is close to the other end of the connecting housing 360 in the length direction, a feeding assembly 370 is disposed in the connecting housing 360, the feeding assembly 370 includes a support block 371, a feeding block 372 and a guide post 374, the support block 371 is disposed on the wall of the connecting housing 360 and close to the open end of the connecting housing 360, one end part of the guide post III 374 is fixedly connected with the support block 371, the other end of the guide post III 374 is provided with an external step, the guide post III 374 is parallel to the length direction of the connecting shell 360, the feeding block 372 is inserted into the connecting shell 360 in a matching mode, one end part of the feeding block 372 is arranged on the guide post III 374 through the connecting lug in a sleeved mode, a spring II is sleeved on the guide post III 374, one end of the spring II is in contact with the support block 371, the other end of the spring II is in contact with the connecting lug at the end part of the feeding block 372, a feeding groove 373 is formed in the feeding block 372, the feeding groove 373 is close to the other end part of the feeding block 372, the feeding groove 373 penetrates through the thickness of the feeding block 372, the feeding groove 373 is located right above the communicating pipe III 362, and colored gas is filled in the storage shell 350.

More specifically, the fixed ejector pad 346 that is provided with of last face of push pedal 342, the up end face of ejector pad 346 is slope arrangement and contacts with the tip of feedblock 372, push pedal 342 moves up along guide pillar two 341 time drive ejector pad 346 and shifts up, the up end of ejector pad 346 conflicts the tip of feedblock 372 after that, thereby make feedblock 372 move along connecting casing 360, after that, the chute 373 of feedblock 372 tip moves to communicating pipe two 361 under, colored gas in storage casing 350 gets into in the chute 373 after that, valve 120, motor two 331 close, baffle 344 resets and seals through-hole 323 on shutoff board 322, feedblock 372 resets, colored gas in the chute 373 gets into in detecting barrel 320 through communicating pipe three 362, colored gas can spill through the gas leakage department that detects barrel 320 wall portion when detecting barrel 320 circulation, thereby be convenient for observe the gas leakage department that detects barrel 320, thereby in time maintain the protection to the gas chromatograph.

The working principle is as follows:

in the use process of the invention, when hydrogen needs to be provided to the chromatograph 20, the valve 120 is opened, the hydrogen circulates through the first communication pipe 110, and when gas leakage detection is performed on the first communication pipe 110, the first motor 311 drives the detection cylinder 320 to move downwards, so that the detection cylinder 320 and the first communication pipe 110 are coaxially arranged, then the rubber pad 321 at the opening end of the detection cylinder 320 is matched and arranged in the accommodating groove 113 at the exhaust end part of the first communication pipe 110, so that the detection cylinder 320 is communicated with the first communication pipe 110, the second motor 331 is started, the output shaft of the second motor 331 rotates to drive the rotating shaft 332 to rotate, so that the first bevel gear 333 rotates, then the second bevel gear 336 and the fan blade 335 rotate, so that the hydrogen in the hydrogen generator 10 is extracted, the rotating shaft 332 drives the lantern ring 337 to rotate during rotation, so that the centrifugal 338 is driven to extend, so that the push plate 342 collides with the second guide pillar 341 to move upwards, and then the baffle 344 is driven to move upwards, so that the second through hole 345 on the baffle 344 coincides with the first through hole 323 on the blocking plate 322 to keep the hydrogen gas flowing, the hydrogen flow rate is monitored by the first sensor 111 and the second sensor 112, if the hydrogen flow rate monitored by the second sensor 112 is less than the hydrogen flow rate monitored by the first sensor 111, it is indicated that the first communication pipe 110 has gas leakage, then the gas leakage position of the first communication pipe 110 is checked, the push plate 342 moves up along the second guide pillar 341 to drive the push block 346 to move up, then the upper end face of the push block 346 abuts against the end of the feed block 372, so that the feed block 372 moves along the connecting shell 360, then the feed groove 373 at the end of the feed block 372 moves right below the second communication pipe 361, then the colored gas in the storage shell 350 enters the feed groove 373, then the valve 120 and the second motor 331 are closed, the baffle 344 resets and blocks the first through hole 323 on the blocking plate 322, the pay-off block 372 resets, and coloured gas in the chute 373 enters into in detecting the barrel 320 through three communicating pipes 362, and coloured gas can spill through the gas leakage department that detects barrel 320 wall portion when detecting the circulation of barrel 320 to be convenient for observe the gas leakage department that detects the barrel 320, thereby carry out timely maintenance protection to the gas chromatograph.

It should be understood that the above-described embodiments are merely preferred embodiments of the invention and the technical principles applied thereto. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, such variations are within the scope of the invention as long as they do not depart from the spirit of the invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims

1. A gas chromatograph having a protective structure, comprising:

2. The gas chromatograph with the protection structure of claim 1, wherein the detection assembly comprises a second motor, a rotating shaft, a first bevel gear, a support plate, a fan blade, a second bevel gear, a sleeve ring, and a centrifugal telescopic rod, the second motor is mounted on a wall of the detection cylinder, an output shaft of the second motor is horizontally arranged, one end of the rotating shaft is coaxially and fixedly connected with an output shaft end of the second motor, the other end of the rotating shaft penetrates through the wall of the detection cylinder and is rotatably connected with the wall of the detection cylinder, the support plate is vertically and fixedly disposed in the detection cylinder, the fan blade is rotatably mounted on the support plate, the second bevel gear is coaxially and fixedly sleeved on a central shaft end of the fan blade, the first bevel gear is meshed with the second bevel gear, the sleeve ring is fixedly sleeved on an end of the rotating shaft, the centrifugal telescopic rod is connected to a ring surface of the sleeve ring, and the centrifugal telescopic rod is provided with a plurality of rings uniformly wound around the ring surface of the sleeve ring.

3. The gas chromatograph with the protection structure as claimed in claim 2, wherein the blocking plate at the closed end of the detection cylinder is provided with a first through hole, the wall of the detection cylinder is provided with an opening and closing assembly, the opening and closing assembly comprises a second guide pillar, a push plate, a connecting plate and a baffle plate, the second guide pillar is vertically arranged on the wall of the detection cylinder, the two guide pillars are arranged in parallel, the top of the second guide pillar is provided with two external steps, the push plate is horizontally arranged and located on one side of the detection cylinder, the push plate is sleeved on the second guide pillar through the connecting plate, the first spring is sleeved on the second guide pillar, one end of the first spring is in contact with the external steps at the top of the second guide pillar, the other end of the first spring is in contact with the plate surface of the connecting plate, the baffle plate is vertically connected to the end of the push plate, the baffle plate is tightly attached to the blocking plate at the closed end of the detection cylinder, the baffle plate is provided with the second through hole, the second through hole is located below the first through hole, and the bottom of the push plate is in contact with the end of the centrifugal telescopic rod.

4. The gas chromatograph with the protection structure as claimed in claim 3, wherein a connection housing is disposed above the detection cylinder, the connection housing is a rectangular housing with one open end and the other closed end, the connection housing is communicated with the detection cylinder through a communication pipe, a storage housing is disposed above the connection housing, the storage housing is communicated with the connection housing through a communication pipe, the communication pipe is close to one end of the connection housing in the length direction, the communication pipe is close to the other end of the connection housing in the length direction, a feeding assembly is disposed in the connection housing, the feeding assembly comprises a support block, a feeding block and a guide pillar III, the support block is disposed on a wall of the connection housing and close to the open end of the connection housing, one end of the guide pillar III is fixedly connected with the support block, the other end of the guide pillar III is provided with an external step, the guide pillar III is parallel to the length direction of the connection housing, the feeding block is inserted into the connection housing in a matching manner, one end of the feeding block is sleeved on the guide pillar III through a connection lug, one end of the guide pillar III is in contact with a connection lug, one end of the spring II, the other end of the spring is in contact with the support block, a feeding groove is disposed in a position above the feeding groove, and a colored gas storage housing is disposed in the feeding groove.

5. The gas chromatograph with the protection structure of claim 4, wherein a push block is fixedly arranged on the upper plate surface of the push plate, and the upper end surface of the push block is obliquely arranged and is in contact with the end of the feed block.