CN110927301A - Automatic injection system for oil chromatography gas sample and working method thereof - Google Patents

Abstract

The invention relates to an automatic injection system of oil chromatogram gas sample and a working method thereof, the system comprises an injector operating handle, an injector control host, a chromatograph sample inlet connecting and guiding device and a control signal line, the injector operating handle consists of a shell, a built-in injector and a driving device, the built-in injector and the driving device are arranged in the shell, the driving device is connected with a piston push rod of the built-in injector to drive the built-in injector to move back and forth, a sample injection needle head penetrates out from an outlet at the front end of the injector operating handle, the chromatograph sample inlet connecting and guiding device comprises a sample inlet connecting and guiding male head arranged at the chromatograph sample inlet and a sample inlet connecting and guiding female head arranged at the outlet at the front end of the injector operating handle to position and guide the sample injection needle head, and the injector control host is electrically connected. The system and the working method thereof not only improve the automation degree of the oil chromatogram gas sample injection, can quickly and accurately inject the gas sample, but also have convenient use and wide application range.

Description

Automatic injection system for oil chromatography gas sample and working method thereof

Technical Field

The invention relates to the field of electric power oil chromatography tests, in particular to an automatic injection system of an oil chromatography gas sample and a working method thereof.

Background

In the power oil chromatography test work, the measured gas sample separated from the insulating oil is injected into the operation link of the gas chromatograph, and the accuracy of the oil chromatography test result is directly related.

The gas sample injection mode of the conventional oil chromatographic test is as follows: the tester uses a 1mL glass syringe with a sample inlet needle to manually and rapidly pull and push out the syringe core for twenty times, uses air to 'clean' the inside of the syringe, then inserts the syringe with exhausted air into a 5mL syringe filled with the gas sample to be tested, accurately extracts 1mL of the gas sample to be tested, and pinches the syringe core. And then the syringe needle is quickly inserted into the sample inlet of the chromatograph, and the finger quickly pushes the syringe core to quickly push the measured gas sample into the chromatograph to complete the injection operation. The speed of needle insertion, needle pushing and needle pulling and the volume of the injected gas sample are required to be completely consistent every time the gas sample is injected, otherwise, larger test errors can be generated.

This mode of operation makes the accuracy of the oil chromatography test completely dependent on the individual perception and reaction speed of the test person. Because the inside of the chromatograph still has the carrier gas pressure of 0.4Mpa, the injection port is sealed by a silica gel pad. During the injection process of the gas sample, a tester needs to accurately insert the syringe needle into the sample inlet and pierce the silica gel pad to inject the gas sample. In the injection process, if the needle is pricked to be deviated, the force is not uniform or the operation is slightly delayed, the needle of the injector is pricked to be deviated and bent, the core of the injector is jacked to fly by the pressure of carrier gas, the injection speed is inconsistent, the gas sample is lost and other sample injection faults occur very easily, and the detection accuracy of the oil chromatography test is seriously influenced.

Disclosure of Invention

The invention aims to provide an automatic injection system of an oil chromatogram gas sample and a working method thereof, which not only improve the automation degree of the injection of the oil chromatogram gas sample, can quickly and accurately inject the gas sample, but also have convenient use and wide application range.

In order to achieve the purpose, the invention adopts the technical scheme that: an automatic injection system of oil chromatogram gas sample comprises an injector operating handle, an injector control host, a chromatograph sample inlet connection guiding device and a control signal line, wherein the injector operating handle mainly comprises a shell, a built-in injector and a driving device, the built-in injector comprises an injection tube, a sample injection needle arranged at the front end of the injection tube and a piston push rod arranged in the injection tube, the driving device is connected with the piston push rod of the built-in injector to drive the front and back movement of the drive device, the sample injection needle penetrates out from the front end outlet of the injector operating handle, the chromatograph sample inlet connection guiding device comprises a sample inlet connection guiding male head and a sample inlet connection guiding female head which can be mutually matched and connected, the sample inlet connection guiding male head is arranged on the sample injection port, the sample inlet connection guiding female head is arranged at the front end outlet of the injector operating handle, the injector control host is electrically connected with the driving device through a control signal line so as to control the driving device to work.

Further, drive arrangement is electromagnetic force drive arrangement, electromagnetic force drive arrangement includes drive connecting rod, syringe tail connector, goes up driving electromagnet and lower driving electromagnet, the drive connecting rod is connected with the rear end of the piston push rod of built-in syringe through syringe tail connector, go up driving electromagnet and lower driving electromagnet subtend set up in drive connecting rod upper and lower both sides, drive connecting rod upper and lower part is equipped with the drive polar plate that can be by upper and lower driving electromagnet actuation respectively, upper and lower driving electromagnet is respectively through control signal line and injector control host computer electric connection to control upper and lower driving electromagnet and gain electricity in turn and produce magnetic force, through attracting corresponding drive polar plate, drive connecting rod up-and-down motion to drive piston push rod seesaw through syringe tail connector.

Furthermore, a driving device sliding groove used for guiding the up-and-down movement of the transmission connecting rod is arranged in the shell of the operating handle of the injector, and an idler wheel is hinged to the edge of the driving polar plate, which is in contact with the driving device sliding groove, so that the friction force is reduced.

Furthermore, a photoelectric position sensor is arranged beside the front end of the injection tube and electrically connected with the injector control host through a control signal line, so that when infrared light is blocked by the piston push rod, the driving electromagnet is not powered on under the control of the injector control host, and when the infrared light is powered on, the driving electromagnet is powered on under the control of the injector control host, and the driving polar plate is attracted to drive the transmission connecting rod to move upwards.

Further, the guider is connected to the chromatograph inlet is equipped with the appearance on the female head of inlet connection direction and triggers micro-gap switch, the appearance triggers micro-gap switch and can be connected the public head of direction and trigger by the inlet when the public head of inlet connection direction is connected the female head cooperation of inlet connection direction and is connected, the appearance triggers micro-gap switch through control signal line and injector control host electric connection to when the appearance triggers micro-gap switch and is triggered, drive electro-magnet is electrified under the control of injector control host, attracts the drive polar plate to drive the drive connecting rod downstream.

Furthermore, the sample inlet connecting and guiding female head mainly comprises a telescopic positioning sheath, a guide ring and an expansion positioning spring, wherein the telescopic positioning sheath is a cone-shaped multi-layer nested structure with a guide through hole in the middle, one end of the telescopic positioning sheath is fixed on an outlet at the front end of an operating handle of the injector, the other end of the telescopic positioning sheath is connected with the guide ring, the expansion positioning spring is arranged in the cone-shaped multi-layer nested structure and is used for expanding the front part of the nested structure to enable the front part of the nested structure to be always kept in a direction parallel to a sample injection needle head, a needle outlet hole is arranged in the middle of the; the public head of introduction port connection direction mainly comprises seal base and guide bar, the seal base lower extreme is installed on the chromatograph introduction port, and the upper end is connected with the guide bar, the guide bar suits with the guiding hole to make the public head of introduction port connection direction and the female head cooperation of introduction port connection direction be connected.

Furthermore, a fixing clamping groove for positioning the built-in injector is formed in the shell, and a transparent observation window is formed in the surface of the shell so as to observe the condition of the built-in injector.

The invention also provides a working method of the automatic injection system of the oil chromatogram gas sample, which comprises the following steps:

s1) respectively installing the sample inlet connection guide male head and the female head on the sample inlet of the chromatograph and an injector operating handle, installing and fixing the built-in injector in the injector operating handle, enabling a sample inlet needle head to penetrate out of the sample inlet connection guide female head, and enabling a piston push rod of the built-in injector to be connected with a driving device;

s2), starting the system, entering a preparation state, controlling the driving device to drive the piston push rod to reciprocate up and down in the built-in injector by the injector control host, sucking and discharging external air into and out of the built-in injector, and finishing cleaning the inside of the built-in injector; after the piston push rod reciprocates for a set number of times, the injector control host controls the driving device to drive the piston push rod to move downwards to the inner lower dead point of the built-in injector, and then the injector stops moving, so that the system is prepared;

s3) after the tested gas sample is injected into the built-in injector, the system enters a state of preparing injection;

s4) connecting the sample inlet connecting and guiding female head with the sample inlet connecting and guiding male head in a matching way, pressing down the operating handle of the injector to ensure that the operating handle of the injector is accurately butted with the chromatograph, and inserting the sample injection needle head into the sample inlet of the chromatograph;

s5) the injector control host controls the driving device to drive the piston push rod to move downwards to the lower dead center in the built-in injector, then the movement is stopped, the measured gas sample is injected into the chromatograph, and the gas sample injection is finished;

s6) the injector operating handle is pulled out, and the system operation is completed.

Further, in the step S3, the sample injection needle of the injector operating handle is inserted into the gas sample injector containing the gas sample to be detected, and the gas sample injector is pushed to inject the gas sample to be detected into the built-in injector; the injection air pressure pushes the piston push rod to displace so that a photoelectric signal is switched on, and the photoelectric position sensor sends a detection signal to the injector control host; the injector control host controls the driving device to drive the piston push rod to move upwards to a preset position in the built-in injector, then the movement is stopped, and the system enters a state of preparing injection;

in step S5, the injector control host controls the driving device to drive the piston rod to move downward to the bottom dead center of the internal syringe, so that the photoelectric signal is blocked, the photoelectric position sensor sends the detection signal to the injector control host, and the injector control host controls the piston rod to stop moving through the driving device.

Further, in step S4, when the sample inlet connection guide female head is connected with the sample inlet connection guide male head in a matching manner, the injector operating handle is pressed down to trigger the sample injection trigger microswitch, the sample injection trigger microswitch sends a trigger signal to the injector control host, and the injector control host controls the driving device to drive the piston push rod to move downwards to inject the gas sample.

Compared with the prior art, the invention has the following beneficial effects: the function of automatically injecting the measured gas sample into the chromatograph in the oil chromatography test is realized, the manual sample injection misoperation of the oil chromatography can be avoided to the greatest extent by applying the system, the error of the oil chromatography test is effectively reduced, the accuracy of the oil chromatography test is improved, and the misjudgment is avoided. Meanwhile, the system can also standardize the operation flow of the oil chromatography test and reduce the operation difficulty of the oil chromatography test. The electromagnetic force attraction driving design of the system ensures that the operation speed of injecting the gas sample is basically consistent with that of the conventional manual sample injection, ensures that the volume of the injected measured gas sample is also basically consistent, avoids the phenomenon of gas sample loss caused by the 'recoil' of carrier gas pressure, and reduces the repeatability deviation caused by sample injection. And the design of the chromatograph sample inlet connection guiding device adopted by the system effectively solves the problem of sample introduction error caused by easy pricking of the sample introduction needle head. Meanwhile, the problems of mutual interference and pollution of different sample residues are solved by automatically controlling the cleaning function. The system is convenient to install and use, does not change the original operation flow, does not perform any destructive transformation on the oil chromatograph, does not change the service performance of the oil chromatograph, can be universally used on various oil chromatographs, is very suitable for being used in power oil chromatographic tests, and has strong practicability and wide application prospect.

Drawings

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

Figure 2 is a schematic diagram of the structure of the operating handle of the injector in an embodiment of the present invention.

Figure 3 is a schematic external view of the operating handle of the injector in an embodiment of the present invention.

Fig. 4 is a control loop diagram of an embodiment of the present invention.

In the figure, 1-an injector operating handle, 101-a fixed clamping groove, 102-a driving device sliding groove, 103-an observation window, 104-a shell, 2-an injector control host, 3-a control signal line, 4-a chromatograph sample inlet connecting guide device, 401-a sample inlet connecting guide female head, 4011-a telescopic positioning sheath, 4012-a guide ring, 4013-an expansion positioning spring, 402-a sample inlet triggering micro switch, 403-a sample inlet connecting guide male head, 4031-a guide rod, 4032-a sealing base, 5-a gas chromatograph, 501-a chromatograph sample inlet, 6-a built-in injector, 601-a piston push rod, 602-a sample inlet needle, 603-a syringe, 7-a photoelectric position sensor and 8-an electromagnetic force driving device, 801-upper driving electromagnet, 802-driving polar plate, 803-roller, 804-transmission connecting rod, 805-injector tail connector and 806-lower driving electromagnet.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

The invention provides an automatic injection system of an oil chromatographic gas sample, which adopts the principle of electromagnetic force forward and reverse attraction drive, utilizes the electromagnetic force to drive a piston push rod of a built-in injector, and completes the operations of 'cleaning', gas sample transfer, automatic gas sample injection and the like before a test, thereby realizing the purpose of automatically injecting a tested gas sample into an oil chromatograph for detection.

The invention relates to an automatic injection system of an oil chromatogram gas sample, which comprises an injector operating handle 1, an injector control host 2, a chromatograph sample inlet connecting and guiding device 4 and a control signal line 3, wherein the injector operating handle 1 mainly comprises a shell 104, a built-in injector 6 arranged in the shell 104 and an electromagnetic force driving device 8, the built-in injector 6 comprises an injection tube 603, a sample injection needle 602 arranged at the front end of the injection tube 603 and a piston push rod 601 arranged in the injection tube, the electromagnetic force driving device 8 is connected with the piston push rod 601 of the built-in injector 6 to drive the built-in injector to move back and forth, the sample injection needle 602 penetrates out from an outlet at the front end of the injector operating handle 1, the sample chromatograph inlet connecting and guiding device 4 comprises a sample inlet connecting and guiding male head 403 and a sample inlet connecting and guiding female head 402 which can be mutually matched and connected, the public head 403 of introduction port connection direction is installed on chromatograph inlet 501, the female head 402 of introduction port connection direction is installed in injector operating handle 1 front end exit to location direction syringe needle 602 makes its and chromatograph inlet 501 quick accurate connection, injector main control system 2 is through control signal line 3 and the 8 electric connection of electromagnetic force drive arrangement, with the work of control electromagnetic force drive arrangement 8.

The electromagnetic force driving device 8 comprises a transmission connecting rod 804, an injector tail connector 805, an upper driving electromagnet 801 and a lower driving electromagnet 806, the transmission connecting rod 804 is connected with the rear end of the piston push rod 601 of the built-in injector 6 through an injector tail connector 805, the upper driving electromagnet 801 and the lower driving electromagnet 806 are oppositely arranged on the upper side and the lower side of the transmission connecting rod 804, the upper and lower parts of the transmission connecting rod 804 are respectively provided with a driving polar plate 802 which can be sucked by an upper and a lower driving electromagnets, the upper and lower driving electromagnets are respectively and electrically connected with the injector control host 2 through control signal wires 3, so as to control the upper driving electromagnet 801 and the lower driving electromagnet 806 to be alternately electrified to generate magnetic force, by attracting the corresponding drive pad 802, the drive link 804 is driven up and down, thereby driving the plunger rod 601 back and forth via the syringe tail connector 805.

The inside of the casing 104 of the injector operating handle 1 is provided with a driving device sliding groove 102 for guiding the up-and-down movement of the transmission connecting rod 804, and the edge of the driving pole plate 802 contacting with the driving device sliding groove 102 is hinged with a roller 803 to reduce the friction force of the relative movement. The upper driving electromagnet 801 and the lower driving electromagnet 806 are both mounted on the driving device chute 102, and the mounting positions can be adjusted up and down to adapt to different sample volumes. The shell 104 is also internally provided with a fixed clamping groove 101 for positioning the built-in injector 6, and the surface of the shell is provided with a transparent observation window 103 for observing the condition of the built-in injector 6.

The side of the front end of the injection tube 603 is provided with a photoelectric position sensor 7, the photoelectric position sensor 7 is electrically connected with the injector control host 2 through a control signal line 3, so that when infrared light is blocked by the piston push rod 601, the injector control host 2 controls the upper driving electromagnet 801 to be not electrified, and when the infrared light is switched on, the injector control host 2 controls the upper driving electromagnet 801 to be electrified, and the suction driving polar plate 802 drives the transmission connecting rod 804 to move upwards.

Chromatograph introduction port connection guider 4 is equipped with the introduction and triggers micro-gap switch 402 on introduction port connection direction female head 401, the introduction triggers micro-gap switch 402 can be triggered by introduction port connection direction male head 403 when introduction port connection direction male head 403 is connected with the introduction port connection direction female head 401 cooperation and is connected, the introduction triggers micro-gap switch 402 through control signal line 3 and 2 electric connection of injector main control system to when introduction triggers micro-gap switch 402 and is triggered, drive electro-magnet 806 gets electricity under the control of injector main control system 2, attracts drive polar plate 802 to drive transmission connecting rod 804 downstream. Specifically, female head 401 of direction is connected to the introduction port mainly comprises flexible location sheath 4011, guide ring 4012 and expansion positioning spring 4013, flexible location sheath 4011 has the cone shape multilayer intussusception structure of guide through-hole for the middle part, and one end is fixed on the export of injector operating handle 1 front end, and the other end is connected with guide ring 4012, expansion positioning spring 4013 locates in the cone shape multilayer intussusception structure for the front portion of expansion intussusception structure makes it remain throughout with introduction syringe needle 602 parallel direction, the guide ring middle part is equipped with out the pinhole, and the side is equipped with the guiding hole. The male head 403 of injection port connection guide mainly comprises sealed base 4032 and guide bar 4031, sealed base 4032 lower extreme is installed on chromatograph inlet 501, and the upper end is connected with guide bar 4031, guide bar 4031 suits with the guiding hole to make the male head 403 of injection port connection guide and the female head 401 of injection port connection guide cooperate and be connected.

In this embodiment, the casing 104 of the operating handle of the injector is made of PVC material, and is mainly used for holding and mounting the components of the injector during sample injection.

The built-in injector 6 is a conventional 1mL blue core glass injector, a blue opaque glass piston push rod is arranged in the built-in injector, and a #5 sample injection needle with the length of 50mm is arranged at the front end of the built-in injector and is used for storing and injecting an oil chromatogram gas sample.

The upper driving electromagnet 801 and the lower driving electromagnet 806 both adopt 24V direct current sucker type electromagnets and 12N attraction force to generate electromagnetic force to attract driving pole plates on the transmission connecting rod and drive the transmission connecting rod to move up and down.

The transmission connecting rod is in an I shape, the upper part and the lower part of the I shape are respectively an iron disc 802 with the diameter of 15mm, the edge of the disc is attached with a plurality of small rollers 803, a T-shaped metal rod 804 is welded in the middle of the two discs, and the T-shaped metal rod is connected with a connector 805 at the tail part of the injector, so that the piston push rod 601 can synchronously move with the driving polar plate 802.

The injector tail connector 805 is a semi-concave cylinder with the diameter of 12mm welded on a T-shaped metal rod 804, a concave part of the cylinder is sleeved on the tail of the piston push rod 601, and the side of the cylinder is punched to fasten the tail of the piston push rod by using a self-tapping bolt.

The injector control host 2 mainly comprises an alternating current 220V power switch, a 220V/24V alternating current-direct current power converter, a PLC programmable controller, a voice alarm and the like, and is used for providing a control loop direct current working power supply, driving electromagnet working current, sample injection trigger control, acousto-optic voice signals and the like. The connection mode of the upper driving electromagnet 801, the lower driving electromagnet 806, the photoelectric position sensor 7 and the control loop of the sample injection trigger microswitch 402 is shown in fig. 4.

The photoelectric position sensor 7 is composed of a miniature infrared light emitter and a photosensitive receiver, which are relatively embedded on the outer walls of the two sides of the front end of the built-in injector 6 and mainly provide action signals for the upper driving electromagnet 801. When the piston push rod 601 is at the 'injection completion' position, infrared light of the sensor 7 is blocked by the piston push rod 601, and the upper driving electromagnet 801 is not electrified. When the gas sample to be measured is transferred into the built-in injector 6, the piston rod 601 is moved by being pushed by the pressure of the gas sample to be measured, the infrared light of the sensor 7 is turned on, the upper driving electromagnet 801 is electrified to attract the driving pole plate 802 to move upwards, and the gas sample can be smoothly transferred from the 5mL gas sample injector into the built-in injector 6.

The sample inlet connection guide male head 403 is made of stainless steel materials according to the specification of a sample inlet of a chromatograph, the lower part of the sample inlet connection guide male head is a sealing base 4032, and a sealing silica gel pad is placed inside the sample inlet connection guide male head and is installed on a sample inlet 501 of the chromatograph for sealing the sample inlet. The upper part of the sealing base 4032 is provided with a circular platform with the diameter of 30mm, the circular platform is provided with four stainless steel guide rods 4031 with the length of 20mm and the diameter of 2mm according to diagonal distribution respectively, and the guide rods are used for guiding the injector sample injection needle 602 to move forwards according to a correct motion track and be inserted into the sample injection port 501 of the chromatograph, so that the needle is prevented from being pricked and deflected during sample injection.

In the female head 401 of direction is connected to the introduction port, flexible location sheath 4011 middle part is a diameter 1mm, length 45 mm's guide through-hole for guide syringe needle direction of advancing prevents that the syringe needle from taking place the skew. The guide ring 4012 is a metal disc with a diameter of 30mm and a thickness of 4mm, the center of the disc is provided with a needle outlet hole, and four guide holes with a diameter of 2.5mm are distributed on the disc surface in diagonal directions and correspond to guide rods of the sample inlet connection guide male heads.

The sample injection trigger microswitch 402 is a push travel switch that provides an actuation signal to the lower drive electromagnet 806. The device is arranged on the side surface of a telescopic positioning sheath 4011 and vertically corresponds to a guide rod 4031 connected with a guide male head of a sample inlet, when the telescopic positioning sheath 4011 is pressed to shrink, the front end of the guide rod 4031 touches a pressing travel switch to send an action signal, so that a lower driving electromagnet 806 is electrified, a driving polar plate 802 is attracted to move downwards quickly, the driving polar plate 802 is always adsorbed on the lower driving electromagnet 806 as long as a sample introduction trigger microswitch is always switched on, and the loss of a measured gas sample caused by the fact that a carrier gas pressure in a chromatograph flushes a syringe core is prevented.

The invention also provides a working method of the automatic injection system of the oil chromatogram gas sample, which comprises the following steps:

s1) respectively installing the sample inlet connection guide male head and the female head on the sample inlet of the chromatograph and the operation handle of the injector, installing and fixing the built-in injector in the operation handle of the injector, enabling the sample inlet needle head to penetrate out of the sample inlet connection guide female head, and enabling the piston push rod to be connected with the driving device.

S2), starting the system, entering a preparation state, controlling the driving device to drive the piston push rod to reciprocate up and down in the built-in injector by the injector control host, sucking and discharging external air into and out of the built-in injector, and finishing cleaning the inside of the built-in injector; and after the piston push rod reciprocates for a set number of times, the injector control host controls the driving device to drive the piston push rod to move downwards to the inner lower dead point of the built-in injector, and then the injector stops moving, so that the system is prepared.

S3) injecting the gas sample to be tested into the built-in injector, and then the system enters a state of preparing for injection. The specific method comprises the following steps: inserting a sample injection needle of an injector operating handle into a gas sample injector filled with a gas sample to be detected, and pushing the gas sample injector to inject the gas sample to be detected into the built-in injector; the injection air pressure pushes the piston push rod to displace so that a photoelectric signal is switched on, and the photoelectric position sensor sends a detection signal to the injector control host; the injector control host controls the driving device to drive the piston push rod to move upwards to a preset position in the built-in injector, then the movement is stopped, and the system enters a state of preparing injection.

S4) connecting the female head with the male head, pressing down the operating handle of the injector to make the operating handle of the injector accurately butt joint with the chromatograph, and inserting the injection needle into the injection port of the chromatograph. When the sample inlet connection guide female head is matched and connected with the sample inlet connection guide male head, the sample injection trigger microswitch is triggered by pressing down the injector operating handle, the sample injection trigger microswitch sends a trigger signal to the injector control host, and the injector control host controls the driving device to drive the piston push rod to move downwards to inject a gas sample.

S5) the injector control host controls the driving device to drive the piston push rod to move downwards to the inner bottom dead center of the built-in injector, then the movement is stopped, the measured gas sample is injected into the chromatograph, and the gas sample injection is completed. The specific method comprises the following steps: the injector control host controls the driving device to drive the piston push rod to move downwards to the inner bottom dead center of the built-in injector, so that after the photoelectric signal is blocked, the photoelectric position sensor sends the detection signal to the injector control host, and the injector control host controls the piston push rod to stop moving through the driving device.

S6) the injector operating handle is pulled out, and the system operation is completed.

The working method of the automatic injection system for oil chromatography gas samples of the invention is further explained by combining with the specific embodiment.

Before use, the original rubber gasket cover of the chromatograph injection port 501 is detached, and the injection port connection guide male head 403 is installed on the chromatograph injection port 501, so that good sealing is ensured. The sample inlet connection guide female head 401 is mounted on the injector operating handle 1. A1 mL built-in syringe 6 with a sampling needle is arranged on a fixed clamping groove 101 in an injector operating handle 1, the installation and fixation are firm, and the sampling needle 602 protrudes out of a guide ring 4012 by 5mm after passing through a guide through hole of a telescopic positioning sheath 4011. The syringe tail connector 805 is mechanically connected to the plunger rod 601 to adjust the position of the up and down drive electromagnets 801 and 806 to the appropriate sample size.

The working power supply is switched on, the system is started, the injector control host 2 enters a 'ready' state, the injector control host 2 is electrified on the electromagnetic force driving device 8, and the driving pole plate 802 starts to rapidly move between the two driving electromagnets 801 and 806 by alternately changing the current passing through the upper driving electromagnet 801 and the lower driving electromagnet 806. The piston rod 601 connected to the drive link 804 is synchronously reciprocated inside the internal syringe 6 to suck or discharge the external air into or out of the internal syringe 6, thereby completing the "cleaning" of the inside of the internal syringe 6. After the piston rod 601 moves up and down to clean twenty times, the injector control host disconnects the current of the upper driving electromagnet 801, the driving pole plate 802 is attracted and moves to the lower driving electromagnet 806 by the electromagnetic force of the lower driving electromagnet 806, and the injector control host 2 disconnects the current of the lower driving electromagnet 806 and sends out a sound-light voice signal of 'preparation completion'.

Degassing the tested oil sample by a conventional mechanical oscillation degassing method, and pumping the removed tested gas sample into a 5mL glass gas sample injector. The injector operating handle 1 is taken up, the needle tip of the sample injection needle 602 protruding from the front end of the injector operating handle 1 is inserted into a 5mL syringe containing a gas sample, and the 5mL syringe core is pushed to inject the gas sample to be detected into the built-in syringe 6. When the gas sample to be measured is injected into the built-in injector 6, the piston push rod 601 is moved and displaced by the pushing action of the injection gas pressure, and when the photoelectric position sensor 7 captures a displacement signal of the piston push rod 601, the injector control host 2 applies current to the upper driving electromagnet 801 to attract the driving pole plate 802 to the upper driving electromagnet 801 to keep still. At this time, the piston rod 601 also reaches the sample volume setting position, and the transfer of the gas sample to be measured from the 5mL syringe to the built-in syringe 6 is completed. At this time, the injector control main body 2 sends out an acousto-optic voice signal of "ready for injection".

Next, the front end of the injector operating handle 1 is connected with the guide ring 4012 of the guide female head 401, and is vertically sleeved downwards into the four guide rods 4031 of the sample inlet connection guide male head 403, and the front end of the whole injector is lightly pressed downwards along with the force to make the two planes coincide. The sample inlet is connected with the telescopic positioning sheath 4011 of the guiding female head 401 under pressure to retract, the sample injection needle 602 continues to advance, and the needle point pierces through the silica gel pad and is inserted into the sample inlet 501 of the chromatograph. When the top end of the guide bar 4031 touches the sample injection trigger microswitch 402, the contact 1J1 is switched on, and the injector control host 2 sends out a sample injection acousto-optic voice signal. Meanwhile, the lower driving electromagnet 806 of the electromagnetic driving system is electrified, the upper driving electromagnet 801 is powered off, and the polar plate 802 is driven under the action of electromagnetic force to drive the piston push rod 601 to move down rapidly until the lower driving electromagnet 801, so that the gas sample to be detected in the built-in injector 6 is injected into the sample inlet 501 of the chromatograph rapidly. When the piston push rod 601 is in place, the signal of the photoelectric position sensor 7 is blocked by the piston push rod 601, so that the injector control host 2 sends an acousto-optic voice signal of 'injection completion'. At this time, the whole operating handle 1 of the injector is pulled upwards, and the operation process of injecting the gas sample is completed. Because each time the trigger signal and the injection process are automatically completed by the injector control host 2, the measured gas sample volume injected into the sample inlet 501 of the chromatograph at each time can be kept consistent, and errors caused by improper sample injection operation are effectively avoided.

When the injection of the current tested gas sample is finished, the injector control host 2 immediately and automatically enters a 'preparation' state, and the built-in injector 6 is cleaned again to prepare for the next sample injection. Thus, the operation processes of automatic gas sample injection, cleaning of the built-in injector and preparation before sample injection of the injector are completed through the processes, and the operation processes are completely consistent with the manual sample injection operation process.

The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.

Claims (10)

1. An automatic injection system of oil chromatogram gas sample is characterized in that the automatic injection system comprises an injector operating handle, an injector control host, a chromatograph sample inlet connecting guide device and a control signal line, the injector operating handle mainly comprises a shell, a built-in injector and a drive device, the built-in injector comprises an injection tube, a sample injection needle head arranged at the front end of the injection tube and a piston push rod arranged in the injection tube, the drive device is connected with the piston push rod of the built-in injector to drive the front and back movement of the drive device, the sample injection needle head penetrates out from the front end outlet of the injector operating handle, the chromatograph sample inlet connecting guide device comprises a sample inlet connecting guide male head and a sample inlet connecting guide female head which can be mutually matched and connected, the sample inlet connecting guide male head is arranged on the chromatograph sample inlet, the sample inlet connecting guide female head is arranged at the front end outlet of the injector operating handle, the injector control host is electrically connected with the driving device through a control signal line so as to control the driving device to work.

2. The automatic injection system of oil chromatography gas sample of claim 1, the driving device is an electromagnetic force driving device which comprises a transmission connecting rod, an injector tail connector, an upper driving electromagnet and a lower driving electromagnet, the transmission connecting rod is connected with the rear end of a piston push rod of the built-in injector through an injector tail connector, the upper driving electromagnet and the lower driving electromagnet are oppositely arranged on the upper side and the lower side of the transmission connecting rod, the upper part and the lower part of the transmission connecting rod are respectively provided with a driving polar plate which can be sucked by the upper driving electromagnet and the lower driving electromagnet, the upper and lower driving electromagnets are electrically connected with the injector control host through control signal lines respectively to control the upper and lower driving electromagnets to be alternately electrified to generate magnetic force, the transmission connecting rod is driven to move up and down by attracting the corresponding driving polar plate, so that the piston push rod is driven to move back and forth by the connector at the tail part of the injector.

3. The automatic oil chromatography gas sample injection system according to claim 2, wherein a driving device chute for guiding the up-and-down movement of the transmission connecting rod is arranged in the casing of the injector operating handle, and a roller is hinged to the edge of the driving polar plate, which is in contact with the driving device chute, so as to reduce friction.

4. The automatic oil chromatography gas sample injection system according to claim 2, wherein a photoelectric position sensor is disposed beside the front end of the injection cylinder, the photoelectric position sensor is electrically connected to the injector control host via a control signal line, so that when the infrared light is blocked by the piston rod, the injector control host controls the upper driving electromagnet to be not powered, and when the infrared light is powered on, the injector control host controls the upper driving electromagnet to be powered, and the driving pole plate is attracted to drive the transmission link to move upward.

5. The system of claim 2, wherein the chromatograph sample inlet connection guide device is provided with a sample inlet connection guide female head with a sample inlet trigger micro-switch, the sample inlet trigger micro-switch is triggered by the sample inlet connection guide male head when the sample inlet connection guide male head is in fit connection with the sample inlet connection guide female head, and the sample inlet trigger micro-switch is electrically connected with the injector control host through a control signal line, so that when the sample inlet trigger micro-switch is triggered, the electromagnet is driven to be powered on under the control of the injector control host, and the drive polar plate is attracted to drive the transmission link to move downwards.

6. The automatic injection system of oil chromatography gas sample according to claim 1, wherein the injection port connection guide female head mainly comprises a telescopic positioning sheath, a guide ring and an expansion positioning spring, the telescopic positioning sheath is a cone-shaped multi-layer nested structure with a guide through hole in the middle, one end of the telescopic positioning sheath is fixed on the front end outlet of the operation handle of the injector, the other end of the telescopic positioning sheath is connected with the guide ring, the expansion positioning spring is arranged in the cone-shaped multi-layer nested structure and is used for expanding the front part of the nested structure to keep the same in a parallel direction with the injection needle all the time, the middle part of the guide ring is provided with a needle outlet hole, and the side of the guide ring is provided with a; the public head of introduction port connection direction mainly comprises seal base and guide bar, the seal base lower extreme is installed on the chromatograph introduction port, and the upper end is connected with the guide bar, the guide bar suits with the guiding hole to make the public head of introduction port connection direction and the female head cooperation of introduction port connection direction be connected.

7. The automatic injection system of an oil chromatography gas sample as claimed in claim 1, wherein a fixing slot for positioning the built-in injector is arranged in the housing, and a transparent observation window is arranged on the surface of the housing to observe the condition of the built-in injector.

8. A working method of an oil chromatogram gas sample automatic injection system is characterized by comprising the following steps:

s1) respectively installing the sample inlet connection guide male head and the female head on the sample inlet of the chromatograph and an injector operating handle, installing and fixing the built-in injector in the injector operating handle, enabling a sample inlet needle head to penetrate out of the sample inlet connection guide female head, and enabling a piston push rod of the built-in injector to be connected with a driving device;

s2), starting the system, entering a preparation state, controlling the driving device to drive the piston push rod to reciprocate up and down in the built-in injector by the injector control host, sucking and discharging external air into and out of the built-in injector, and finishing cleaning the inside of the built-in injector; after the piston push rod reciprocates for a set number of times, the injector control host controls the driving device to drive the piston push rod to move downwards to the inner lower dead point of the built-in injector, and then the injector stops moving, so that the system is prepared;

s3) after the tested gas sample is injected into the built-in injector, the system enters a state of preparing injection;

s4) connecting the sample inlet connecting and guiding female head with the sample inlet connecting and guiding male head in a matching way, pressing down the operating handle of the injector to ensure that the operating handle of the injector is accurately butted with the chromatograph, and inserting the sample injection needle head into the sample inlet of the chromatograph;

s5) the injector control host controls the driving device to drive the piston push rod to move downwards to the lower dead center in the built-in injector, then the movement is stopped, the measured gas sample is injected into the chromatograph, and the gas sample injection is finished;

s6) the injector operating handle is pulled out, and the system operation is completed.

9. The operating method of the automatic injection system of the oil chromatography gas sample as claimed in claim 8, wherein in the step S3, the sample injection needle of the operating handle of the injector is inserted into the gas sample injector containing the gas sample to be tested, and the gas sample injector is pushed to inject the gas sample to be tested into the built-in injector; the injection air pressure pushes the piston push rod to displace so that a photoelectric signal is switched on, and the photoelectric position sensor sends a detection signal to the injector control host; the injector control host controls the driving device to drive the piston push rod to move upwards to a preset position in the built-in injector, then the movement is stopped, and the system enters a state of preparing injection;

in step S5, the injector control host controls the driving device to drive the piston rod to move downward to the bottom dead center of the internal syringe, so that the photoelectric signal is blocked, the photoelectric position sensor sends the detection signal to the injector control host, and the injector control host controls the piston rod to stop moving through the driving device.

10. The operating method of the automatic oil chromatography gas sample injection system according to claim 8, wherein in step S4, when the female sample inlet connection guide head is in fit connection with the male sample inlet connection guide head, the injector operating handle is pressed down to trigger the sample injection trigger micro switch, the sample injection trigger micro switch sends a trigger signal to the injector control host, and the injector control host controls the driving device to drive the piston push rod to move downward to inject the gas sample.

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