An automatic oil chromatography gas sample injection device

Abstract

The present invention relates to an automatic oil chromatographic gas sample injection device, comprising an injector operating handle and a chromatographic instrument injection port connection guide device, the injector operating handle is mainly composed of a housing, a built-in syringe arranged in the housing, and an electromagnetic force driving device, the built-in syringe comprises a syringe, an injection needle arranged at the front end of the syringe, and a piston push rod arranged in the syringe, the electromagnetic force driving device is connected to the piston push rod to drive it to move forward and backward, the injection needle passes through the front end outlet of the injector operating handle, and the chromatographic instrument injection port connection guide device comprises an injection port connection guide male head installed at the chromatographic instrument injection port and an injection port connection guide female head installed at the front end outlet of the injector operating handle to position and guide the injection needle so that it can be quickly and accurately connected with the chromatographic instrument injection port. The device not only improves the automation of oil chromatographic gas sample injection, can quickly and accurately perform gas sample injection, but also is convenient to use and has a wide range of applications.

Description

Technical Field

[0001] The invention relates to the field of electric power oil chromatography test, and in particular to an oil chromatography gas sample automatic injection device. Background Art

[0002] In the electric oil chromatography test, the operation of injecting the gas sample separated from the insulating oil into the gas chromatograph is directly related to the accuracy of the oil chromatography test results.

[0003] The gas sample injection method for conventional oil chromatography tests is: the tester uses a 1mL glass syringe with a sampling needle, manually pulls and pushes out the syringe core about twenty times, "cleans" the inside of the syringe with air, and then inserts the syringe with all the air exhausted into the 5mL syringe containing the gas sample to be measured, accurately extracts 1mL of the gas sample to be measured, and pinches the syringe core. Then quickly insert the syringe needle into the sampling port of the chromatograph, and quickly push the syringe core with your fingers to quickly push the gas sample to be measured into the chromatograph to complete the injection operation. Each time the gas sample is injected, the speed of inserting the needle, pushing the needle, and pulling the needle, as well as the volume of the injected gas sample, must be completely consistent, otherwise a large test error will occur.

[0004] This operation mode makes the accuracy of oil chromatography test completely rely on the personal feeling and reaction speed of the tester. Since there is still a carrier gas pressure of 0.4Mpa inside the chromatograph, its injection port is sealed with a silicone pad. During the gas sample injection process, the tester must accurately insert the syringe needle into the injection port and pierce the silicone pad before injecting the gas sample. During the injection process, if the needle is pierced off-center, the force is uneven, or the operation is slightly hesitant, it is very easy to cause injection errors such as the syringe needle being pierced off-center, the syringe core being lifted off by the carrier gas pressure, the injection speed being inconsistent, and the gas sample being lost, which seriously affects the detection accuracy of the oil chromatography test.

[0005] Therefore, it is necessary to develop a special gas sample automatic injection device that meets the requirements of power insulating oil chromatography test to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide an automatic oil chromatogram gas sample injection device, which not only improves the automation level of oil chromatogram gas sample injection, can quickly and accurately perform gas sample injection, but also is easy to use and has a wide range of applications.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an automatic oil chromatographic gas sample injection device, including an injector operating handle and a chromatograph injection port connection guide device, the injector operating handle is mainly composed of a shell, a built-in syringe and an electromagnetic force driving device arranged in the shell, the built-in syringe includes a syringe, an injection needle arranged at the front end of the syringe and a piston push rod arranged in the syringe, the electromagnetic force driving device is connected to the piston push rod of the built-in syringe to drive it to move back and forth, the injection needle passes through the front end outlet of the injector operating handle, the chromatograph injection port connection guide device includes an injection port connection guide male head and an injection port connection guide female head that can be matched and connected to each other, the injection port connection guide male head is installed on the chromatograph injection port, and the injection port connection guide female head is installed at the front end outlet of the injector operating handle to position and guide the injection needle so that it can be quickly and accurately connected to the chromatograph injection port.

[0008] Furthermore, the electromagnetic force driving device includes a transmission connecting rod, a syringe tail connector, an upper driving electromagnet and a lower driving electromagnet. The transmission connecting rod is connected to the rear end of the piston push rod of the built-in syringe via the syringe tail connector. The upper driving electromagnet and the lower driving electromagnet are arranged on the upper and lower sides of the transmission connecting rod opposite to each other. The upper and lower parts of the transmission connecting rod are respectively provided with driving pole plates that can be attracted by the upper and lower driving electromagnets. The upper and lower driving electromagnets are respectively electrically connected to the control device to control the upper and lower driving electromagnets to alternately obtain electricity to generate magnetic force, and drive the transmission connecting rod to move up and down by attracting the corresponding driving pole plates, thereby driving the piston push rod to move forward and backward through the syringe tail connector.

[0009] Furthermore, a drive device slide groove for guiding the up and down movement of the transmission connecting rod is provided in the shell of the injector operating handle, and a roller is hinged on the edge of the drive plate in contact with the drive device slide groove to reduce friction.

[0010] Furthermore, the upper and lower driving electromagnets are installed on the driving device slideway, and the installation positions can be adjusted up and down to adapt to different injection volumes.

[0011] Furthermore, a photoelectric position sensor is provided on the side of the front end of the syringe, and the photoelectric position sensor is electrically connected to the control device, so that when the infrared light is blocked by the piston push rod, the upper driving electromagnet is controlled by the control device to be energized, and when the infrared light is turned on, the upper driving electromagnet is controlled by the control device to be energized, thereby attracting the driving plate to drive the transmission connecting rod to move upward.

[0012] Furthermore, the chromatograph injection port connection guide device is provided with an injection trigger micro switch on the injection port connection guide female head, and the injection trigger micro switch will be triggered by the injection port connection guide male head when the injection port connection guide male head and the injection port connection guide female head are matched and connected. The injection trigger micro switch is electrically connected to the control device, so that when the injection trigger micro switch is triggered, the driving electromagnet is energized under the control of the control device, attracting the driving electrode plate to drive the transmission connecting rod to move downward.

[0013] Furthermore, the injection port connection guide female head is mainly composed of a telescopic positioning sleeve, a guide ring and an expansion positioning spring. The telescopic positioning sleeve is a conical multi-layer stacking structure with a guide through hole in the middle, one end of which is fixed on the front end outlet of the injector operating handle, and the other end is connected to the guide ring. The expansion positioning spring is arranged in the conical multi-layer stacking structure, and is used to expand the front part of the stacking structure so that it always remains parallel to the injection needle. The middle part of the guide ring is provided with a needle outlet hole, and the side is provided with a guide hole; the injection port connection guide male head is mainly composed of a sealing base and a guide rod. The lower end of the sealing base is installed on the chromatograph injection port, and the upper end is connected to the guide rod. The guide rod is adapted to the guide hole so that the injection port connection guide male head and the injection port connection guide female head can be matched and connected.

[0014] Furthermore, a fixing slot for positioning the built-in syringe is provided in the shell, and a transparent observation window is provided on the surface of the shell to observe the condition of the built-in syringe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the function of automatically injecting the gas sample to be tested in the oil chromatography test into the chromatograph is realized. Through the application of this device, the manual injection operation errors of the oil chromatography can be avoided to the greatest extent, the error of the oil chromatography test can be effectively reduced, the accuracy of the oil chromatography test can be improved, and the misjudgment can be avoided. At the same time, the device can also standardize the operation process of the oil chromatography test and reduce the operation difficulty of the oil chromatography test. The electromagnetic force attraction drive design of the device makes the operation speed of injecting the gas sample basically consistent with the conventional manual injection, ensuring that the volume of the injected gas sample to be tested is also basically consistent, avoiding the phenomenon of gas sample loss caused by the "recoil" of the carrier gas pressure, and reducing the reproducibility deviation caused by the injection. In addition, the chromatograph injection port connection guide device design adopted by the device effectively solves the problem of injection errors caused by the injection needle being easily pierced. At the same time, the problem of mutual interference and contamination of residues of different samples is also solved through the automatic control of the "cleaning" function. The device is easy to install and use, does not change the original operating procedures, does not make any destructive modifications to the oil chromatograph, and does not change the performance of the oil chromatograph. It can be used on various oil chromatographs and is very suitable for use in power oil chromatography tests. It has strong practicality and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of the appearance of an embodiment of the present invention.

[0018] Figure 3 Schematic diagram of the use status of an embodiment of the present invention.

[0019] Figure 4 4 is a control circuit diagram of an embodiment of the present invention.

[0020] In the figure, 1-injector operating handle, 101-fixed card slot, 102-drive device slide slot, 103-observation window, 104-housing, 2-control device, 3-control signal line, 4-chromatographic instrument injection port connecting guide device, 401-injection port connecting guide female head, 4011-telescopic positioning sleeve, 4012-guide ring, 4013-expansion positioning spring, 402-injection trigger micro switch, 403-injection port connecting guide male head, 4031-guide rod, 4032-sealing base, 5-gas chromatograph, 501-chromatograph injection port, 6-built-in syringe, 601-piston push rod, 602-injection needle, 603-syringe, 7-photoelectric position sensor, 8-electromagnetic force driving device, 801-upper driving electromagnet, 802-driving plate, 803-roller, 804-transmission connecting rod, 805-syringe tail connector, 806-lower driving electromagnet. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The present invention provides an automatic gas sample injection device for oil chromatography, which adopts the electromagnetic force positive and negative attraction driving principle, utilizes the electromagnetic force to drive the piston push rod of the built-in syringe, completes the operations such as "cleaning" before the test, gas sample transfer, and automatic gas sample injection, thereby realizing the purpose of automatically injecting the gas sample to be tested into the oil chromatograph for detection.

[0023] The oil chromatography gas sample automatic injection device of the present invention is as follows Figure 1 , 23, comprising an injector operating handle 1 and a chromatograph injection port connecting guide device 4, the injector operating handle 1 is mainly composed of a housing 104 and a built-in syringe 6 and an electromagnetic force driving device 8 arranged in the housing 104, the built-in syringe 6 comprises a syringe 603, an injection needle 602 arranged at the front end of the syringe 603 and a piston push rod 601 arranged in the syringe, the electromagnetic force driving device 8 is connected to the piston push rod 601 of the built-in syringe 6 to drive it to move back and forth, the injection needle 602 passes through the front end outlet of the injector operating handle 1, the chromatograph injection port connecting guide device 4 comprises an injection port connecting guide male head 403 and an injection port connecting guide female head 402 which can be matched and connected to each other, the injection port connecting guide male head 403 is installed on the chromatograph injection port 501, and the injection port connecting guide female head 402 is installed at the front end outlet of the injector operating handle 1 to position and guide the injection needle 602 so that it can be quickly and accurately connected to the chromatograph injection port 501.

[0024] The electromagnetic force driving device 8 includes a transmission connecting rod 804, a syringe tail connector 805, an upper driving electromagnet 801 and a lower driving electromagnet 806. The transmission connecting rod 804 is connected to the rear end of the piston push rod 601 of the built-in syringe 6 via the syringe tail connector 805. The upper driving electromagnet 801 and the lower driving electromagnet 806 are arranged on the upper and lower sides of the transmission connecting rod 804 in opposite directions. The upper and lower parts of the transmission connecting rod 804 are respectively provided with driving pole plates 802 that can be attracted by the upper and lower driving electromagnets. The upper and lower driving electromagnets are electrically connected to the control device 2 via the control signal line 3 to control the upper driving electromagnet 801 and the lower driving electromagnet 806 to alternately generate magnetic force, and drive the transmission connecting rod 804 to move up and down by attracting the corresponding driving pole plates 802, thereby driving the piston push rod 601 to move forward and backward through the syringe tail connector 805.

[0025] The housing 104 of the injector operating handle 1 is provided with a drive device chute 102 for guiding the up and down movement of the transmission connecting rod 804. The edge of the drive plate 802 in contact with the drive device chute 102 is hinged with a roller 803 to reduce the friction of relative movement. The upper drive electromagnet 801 and the lower drive electromagnet 806 are both installed on the drive device chute 102, and the installation position can be adjusted up and down to adapt to different injection volumes. The housing 104 is also provided with a fixed card slot 101 for positioning the built-in syringe 6, and the surface of the housing is provided with a transparent observation window 103 to observe the situation of the built-in syringe 6.

[0026] A photoelectric position sensor 7 is provided on the side of the front end of the injection cylinder 603, and the photoelectric position sensor 7 is electrically connected to the control device 2 via the control signal line 3, so that when the infrared light is blocked by the piston push rod 601, the upper driving electromagnet 801 is controlled by the control device 2 to be powered off, and when the infrared light is turned on, the upper driving electromagnet 801 is controlled by the control device 2 to be powered, thereby attracting the driving plate 802 to drive the transmission connecting rod 804 to move upward.

[0027] The chromatograph injection port connection guide device 4 is provided with an injection trigger micro switch 402 on the injection port connection guide female head 401. The injection trigger micro switch 402 will be triggered by the injection port connection guide male head 403 when the injection port connection guide male head 403 is matched with the injection port connection guide female head 401. The injection trigger micro switch 402 is electrically connected to the control device 2 via the control signal line 3, so that when the injection trigger micro switch 402 is triggered, the driving electromagnet 806 is energized under the control of the control device 2, attracting the driving electrode plate 802 to drive the transmission connecting rod 804 to move downward. Specifically, the injection port connection guide female head 401 is mainly composed of a telescopic positioning sleeve 4011, a guide ring 4012 and an expansion positioning spring 4013. The telescopic positioning sleeve 4011 is a conical multilayer stacking structure with a guide through hole in the middle, one end of which is fixed on the front end outlet of the injector operating handle 1, and the other end is connected to the guide ring 4012. The expansion positioning spring 4013 is arranged in the conical multilayer stacking structure, and is used to expand the front part of the stacking structure so that it always keeps a parallel direction with the injection needle 602. The middle part of the guide ring is provided with a pin hole, and the side is provided with a guide hole. The injection port connection guide male head 403 is mainly composed of a sealing base 4032 and a guide rod 4031. The lower end of the sealing base 4032 is installed on the chromatograph injection port 501, and the upper end is connected to the guide rod 4031. The guide rod 4031 is adapted to the guide hole so that the injection port connection guide male head 403 and the injection port connection guide female head 401 are matched and connected.

[0028] In this embodiment, the housing 104 of the injector operating handle is made of PVC material and is mainly used for grasping and installing various components of the injector during injection.

[0029] The built-in syringe 6 is a conventional 1 mL blue core glass syringe, which is provided with a blue opaque glass piston push rod inside and a 50 mm long #5 injection needle at the front end for storing and injecting oil chromatographic gas samples.

[0030] The upper driving electromagnet 801 and the lower driving electromagnet 806 are both 24V DC suction cup electromagnets with an attraction force of 12N to generate electromagnetic force to attract the driving pole plate on the transmission connecting rod, driving the transmission connecting rod to move up and down.

[0031] The transmission connecting rod is in the shape of an "I" character, and the upper and lower parts of the "I" character are respectively an iron disc 802 with a diameter of 15 mm, and a number of small rollers 803 are attached to the edge of the disc. A "T"-shaped metal rod 804 is welded in the middle of the two discs. The "T"-shaped metal rod is connected to the connector 805 at the tail of the syringe, so that the piston push rod 601 can move synchronously with the driving plate 802.

[0032] The syringe tail connector 805 is a semi-concave cylinder with a diameter of 12 mm welded on a "T"-shaped metal rod 804. The concave part of the cylinder is sleeved on the tail of the piston push rod 601. A hole is punched on the side of the cylinder and a self-tapping bolt is used to fasten the tail of the piston push rod.

[0033] The control device 2 for controlling the electromagnetic force driving device 8 is mainly composed of an AC 220V power switch, a 220V / 24V AC / DC power converter, a PLC programmable controller, a voice alarm, etc., and is used to provide a control circuit DC working power supply, a driving electromagnet working current, a sample injection trigger control, an acoustic and optical voice signal, etc. The control circuit connection mode of the control device 2 with the upper driving electromagnet 801, the lower driving electromagnet 806, the photoelectric position sensor 7, and the sample injection trigger micro switch 402 is as follows: Figure 4 shown.

[0034] 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 on both sides of the front end of the built-in syringe 6, and mainly provide action signals for the upper driving electromagnet 801. When the piston push rod 601 is in the "injection completed" position, the infrared light of the sensor 7 is blocked by the piston push rod 601, and the upper driving electromagnet 801 is not charged. When the measured gas sample is transferred into the built-in syringe 6, the piston push rod 601 is pushed by the pressure of the measured gas sample to move, the infrared light of the sensor 7 is turned on, and the upper driving electromagnet 801 is charged to attract the driving plate 802 to move upward, so that the gas sample can be smoothly transferred from the 5mL gas sample syringe to the built-in syringe 6.

[0035] The injection port connecting guide male head 403 is made of stainless steel material according to the specifications of the chromatograph injection port, and its lower part is a sealing base 4032, in which a sealing silicone pad is placed, which is installed on the chromatograph injection port 501 for injection port sealing. The upper part of the sealing base 4032 is a circular platform with a diameter of 30mm, and the circular platform is equipped with four stainless steel guide rods 4031 with a length of 20mm and a diameter of 2mm, which are diagonally distributed, and are used to guide the syringe injection needle 602 to move forward and insert into the chromatograph injection port 501 according to the correct movement trajectory to prevent the needle from being pierced during injection.

[0036] In the injection port connecting guide female connector 401, the middle of the telescopic positioning sheath 4011 is a guide through hole with a diameter of 1 mm and a length of 45 mm, which is used to guide the forward direction of the syringe injection needle to prevent the injection needle from deviating. The guide ring 4012 is a metal disc with a diameter of 30 mm and a thickness of 4 mm. The center of the disc is the needle hole, and four guide holes with a diameter of 2.5 mm are distributed diagonally on the disc surface, corresponding to the guide rod of the injection port connecting guide male connector.

[0037] The injection trigger micro switch 402 is a press stroke switch, which mainly provides an action signal for the lower driving electromagnet 806. It is installed on the side of the telescopic positioning sheath 4011, and vertically corresponds to the guide rod 4031 connected to the guide male head of the injection port. When the telescopic positioning sheath 4011 is pressed and contracted, the front end of the guide rod 4031 touches the press stroke switch, and sends an action signal to make the lower driving electromagnet 806 charged, attracting the driving plate 802 to move downward quickly. As long as the injection trigger micro switch is always turned on, the driving plate 802 is always adsorbed on the lower driving electromagnet 806, preventing the internal carrier gas pressure of the chromatograph from flushing the syringe core and causing the loss of the measured gas sample.

[0038] The working method of the oil chromatography gas sample automatic injection device of the present invention is described below in conjunction with the accompanying drawings.

[0039] Before use, remove the original rubber pad cover of the chromatograph injection port 501, install the injection port connecting guide male head 403 on the chromatograph injection port 501, and ensure good sealing. Install the 1mL glass syringe 6 with the injection needle into the fixed card slot 101 inside the injector operating handle 1, fix it firmly, and the injection needle 602 protrudes 5mm outside the guide ring 4012 after passing through the guide hole of the telescopic positioning sheath 4011. Then mechanically connect the syringe tail connector 805 with the piston push rod 601, and adjust the upper and lower driving electromagnets 801 and 806 to the appropriate injection volume.

[0040] Press the power switch QF1 to turn on the working power supply, start the control device 2 and make it enter the "ready" state. The control device 2 energizes the electromagnetic force driving device 8, and by alternately changing the currents of the upper and lower driving electromagnets 801 and 806, the driving plate 802 starts to move rapidly between the two driving electromagnets 801 and 806 by electromagnetic attraction. The piston push rod 601 connected to it through the transmission connecting rod 804 makes synchronous reciprocating motion in the built-in syringe 6, sucking or discharging the external air into or out of the built-in syringe 6, and completing the "cleaning" of the inside of the built-in syringe 6. After the piston push rod 601 moves up and down for "cleaning" twenty times, the control device disconnects the current of the upper driving electromagnet 801, and the driving plate 802 is attracted by the electromagnetic force of the lower driving electromagnet 806 and moves to the lower driving electromagnet 806. The control device 2 disconnects the current of the lower driving electromagnet 806 and sends out an acousto-optic voice signal of "ready completed".

[0041] The oil sample to be tested is degassed by conventional mechanical oscillation degassing method, and the degassed gas sample to be tested is drawn into a 5mL glass gas sample syringe. Pick up the injector operating handle 1, insert the tip of the injection needle 602 protruding from the front end of the injector operating handle 1 into the 5mL syringe containing the gas sample, and push the 5mL syringe core to inject the gas sample to be tested into the built-in syringe 6. After the gas sample to be tested is injected into the built-in syringe 6, the piston push rod 601 is moved and displaced by the driving effect of the injection air pressure. When the photoelectric position sensor 7 captures the displacement signal of the piston push rod 601, the control device 2 applies current to the upper drive electromagnet 801, and attracts the drive plate 802 to the upper drive electromagnet 801 and keeps it still. At this time, the piston push rod 601 also reaches the injection volume setting position, thereby completing the transfer of the gas sample to be tested from the 5mL syringe to the built-in syringe 6. At this time, the control device 2 sends an audio-visual voice signal of "ready to inject".

[0042] Next, the guide ring 4012 of the injection port connecting guide female head 401 of the injector operating handle 1 is vertically inserted into the four guide rods 4031 of the injection port connecting guide male head 403, and the entire front end of the injector is gently pressed downward to make the two planes overlap. Under pressure, the telescopic positioning sheath 4011 of the injection port connecting guide female head 401 retracts, and the injection needle 602 continues to move forward, and the needle tip pierces the silicone pad and inserts into the chromatograph injection port 501. When the top of the guide rod 4031 touches the injection trigger micro switch 402, its contact 1J1 is connected, and the control device 2 sends a "sample injection" sound and light voice signal. At the same time, the electromagnetic drive system drives the lower drive electromagnet 806 to be charged, and the upper drive electromagnet 801 is powered off. Under the action of electromagnetic force, the driving plate 802 drives the piston push rod 601 to move down quickly until the lower drive electromagnet 801 is at, so that the measured gas sample in the built-in syringe 6 is quickly injected into the chromatograph injection port 501. 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 control device 2 sends out an audio-visual voice signal of "injection completed". At this time, the entire injector operating handle 1 is pulled upward to complete the operation process of injecting the gas sample. Since each trigger signal and injection process are automatically completed by the control device 2, it is ensured that the volume of the measured gas sample injected into the chromatograph injection port 501 can be kept consistent each time, effectively avoiding the error caused by improper injection operation.

[0043] When the injection of the current gas sample is completed, the control device 2 automatically enters the "ready" state immediately and re-cleans the built-in syringe 6 to prepare for the next injection. Through the above process, the operation process of the injector automatically injecting gas samples, cleaning the built-in syringe, and preparing for injection is completed, which is completely consistent with the manual injection operation process.

[0044] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions do not exceed the scope of the technical solution of the present invention, belong to the protection scope of the present invention.

Claims

1. An automatic oil chromatography gas sample injection device, characterized in that: It comprises an injector operating handle and a chromatograph injection port connection guide device, the injector operating handle is mainly composed of a shell, a built-in syringe arranged in the shell, and an electromagnetic force driving device, the built-in syringe comprises a syringe, an injection needle arranged at the front end of the syringe, and a piston push rod arranged in the syringe, the electromagnetic force driving device is connected to the piston push rod of the built-in syringe to drive it to move forward and backward, the injection needle passes through the front end outlet of the injector operating handle, the chromatograph injection port connection guide device comprises an injection port connection guide male head and an injection port connection guide female head which can be matched and connected with each other, the injection port connection guide male head is installed on the chromatograph injection port, and the injection port connection guide female head is installed at the front end outlet of the injector operating handle to position and guide the injection needle so that it can be quickly and accurately connected with the chromatograph injection port; The electromagnetic force driving device comprises a transmission connecting rod, a syringe tail connector, an upper driving electromagnet and a lower driving electromagnet. The transmission connecting rod is connected to the rear end of the piston push rod of the built-in syringe via the syringe tail connector. The upper driving electromagnet and the lower driving electromagnet are arranged oppositely on the upper and lower sides of the transmission connecting rod. The upper and lower parts of the transmission connecting rod are respectively provided with driving pole plates that can be attracted by the upper and lower driving electromagnets. The upper and lower driving electromagnets are respectively electrically connected to the control device to control the upper and lower driving electromagnets to alternately generate magnetic force, and drive the transmission connecting rod to move up and down by attracting the corresponding driving pole plates, thereby driving the piston push rod to move forward and backward through the syringe tail connector; The chromatograph injection port connection guide device is provided with an injection trigger micro switch on the injection port connection guide female head, and the injection trigger micro switch is triggered by the injection port connection guide male head when the injection port connection guide male head is matched with the injection port connection guide female head, and the injection trigger micro switch is electrically connected to the control device, so that when the injection trigger micro switch is triggered, the driving electromagnet is energized under the control of the control device, attracting the driving plate to drive the transmission connecting rod to move downward; The injection port connection guide female head is mainly composed of a telescopic positioning sleeve, a guide ring and an expansion positioning spring. The telescopic positioning sleeve is a conical multi-layer stacking structure with a guide through hole in the middle, one end of which is fixed on the front end outlet of the injector operating handle, and the other end is connected to the guide ring. The expansion positioning spring is arranged in the conical multi-layer stacking structure, and is used to expand the front part of the stacking structure so that it always keeps a parallel direction with the injection needle. The middle part of the guide ring is provided with a needle outlet hole, and the side is provided with a guide hole; the injection port connection guide male head is mainly composed of a sealing base and a guide rod. The lower end of the sealing base is installed on the chromatograph injection port, and the upper end is connected to the guide rod. The guide rod is adapted to the guide hole so that the injection port connection guide male head and the injection port connection guide female head can be matched and connected.

2. The oil chromatography gas sample automatic injection device according to claim 1, characterized in that: A drive device slideway for guiding the up and down movement of the transmission connecting rod is arranged in the shell of the injector operating handle, and a roller is hingedly connected on the edge of the drive plate contacting the drive device slideway to reduce friction.

3. The oil chromatography gas sample automatic injection device according to claim 2, characterized in that: The upper and lower driving electromagnets are installed on the driving device slideway, and the installation positions can be adjusted up and down to adapt to different injection volumes.

4. The oil chromatography gas sample automatic injection device according to claim 1, characterized in that: A photoelectric position sensor is provided on the side of the front end of the injection cylinder, and the photoelectric position sensor is electrically connected to the control device so that when the infrared light is blocked by the piston push rod, the control device controls the upper driving electromagnet to be energized, and when the infrared light is turned on, the control device controls the upper driving electromagnet to be energized, thereby attracting the driving plate to drive the transmission connecting rod to move upward.

5. The oil chromatography gas sample automatic injection device according to claim 1, characterized in that: A fixing slot for positioning the built-in syringe is provided in the shell, and a transparent observation window is provided on the surface of the shell to observe the condition of the built-in syringe.

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