Automatic sample injection continuous combustion tester and use method thereof

Abstract

The invention provides an automatic sample injection continuous combustion tester and a use method thereof, and relates to the field of combustion testers, the automatic sample injection continuous combustion tester comprises a combustion tester body, a combustion table, an ignition assembly, a gas supply assembly, a sample supply assembly, a sample injection pipe and a plane adjusting assembly, and the sample injection pipe is fixedly connected with the output end of the plane adjusting assembly; the sample injection pipe is communicated with the output end of the sample supply assembly, the surface of the sample injection pipe is slidably connected with a sealing cover, the sealing cover is buckled on the combustion table, the surface of the sample injection pipe is further fixedly connected with a blocking lifting plate, the top of the blocking lifting plate is attached to the inner side of the top of the sealing cover, and a combustion groove is formed in the top of the combustion table; the dynamic sample injection pipe is designed to extend below the combustion liquid level or just contact with the liquid level for injection instead of spraying above the liquid level, so that the liquid is prevented from being atomized or volatilized in the falling process, and for volatile liquid, the injection amount can be ensured to be the weighing amount, the mass conservation is ensured, and the working efficiency is improved. Meanwhile, the distance between the sample injection pipe and the liquid level is kept consistent during each sample injection.

Description

Technical Field

[0001] This invention relates to the field of combustion testing apparatus, and more particularly to an automatic sample-feeding continuous combustion testing apparatus and its method of use. Background Technology

[0002] In the grand scheme of industrial production, hazardous materials transportation, and consumer product safety supervision, combustion performance testing is undoubtedly the "last line of defense" in protecting life and property. Whether it is the determination of the flash point and ignition point of chemical liquids or the assessment of the sustained combustion stability of ignition devices such as lighters, the accuracy of the data is directly related to the graded management of fire risks, the breakthrough of international trade barriers, and the success or failure of new material research and development.

[0003] The existing publication number CN223154957U discloses a liquid continuous combustion tester, including an instrument body, a detection module fixedly installed on the top of the instrument body, a sample plate movably installed on the top of the instrument body located on the right side of the detection module, a sample groove opened on the top of the sample plate, a handle fixedly installed on the top of the sample plate, and an ignition needle fixedly installed on the top of the instrument body. In daily use, the operator places the sample plate on the test platform, then uses a 10mL syringe to take 6mL of test liquid and places it inside the sample groove. The sample is then prepared. The sample groove is divided into an aluminum alloy sample groove and a stainless steel sample groove. The aluminum alloy sample groove has good thermal conductivity, while the stainless steel sample groove is used to hold samples with high viscosity to meet the testing needs of different liquids.

[0004] However, the aforementioned combustion test instrument is limited to recording a single parameter and lacks adjustment based on ambient air pressure and temperature. For example, in high-altitude, low-pressure environments, if the test temperature cannot be automatically corrected, the combustion judgment will be meaningless. At the same time, it cannot maintain a consistent liquid supply height, which easily leads to volatilization and inaccurate test results.

[0005] Therefore, it is necessary to provide a new automatic sample-injection continuous combustion test instrument and its usage method to solve the above-mentioned technical problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides an automatic sample-feeding continuous combustion test instrument and its usage method.

[0007] The automatic sample-injection continuous combustion test apparatus provided by the present invention includes a combustion instrument body, a combustion platform, an ignition assembly, a gas supply assembly, a sample supply assembly, a sample injection tube, and a plane adjustment assembly for moving the sample injection tube in the up, down, left, and right directions. The combustion platform, ignition assembly, gas supply assembly, sample supply assembly, and plane adjustment assembly are all located on one side of the top of the combustion instrument body. The sample injection tube is fixedly connected to the output end of the plane adjustment assembly and communicates with the output end of the sample supply assembly. A cover is slidably connected to the surface of the sample injection tube and is fastened to the combustion platform. A sealing lifting plate is also fixedly connected to the surface of the sample injection tube, and the top of the sealing lifting plate is in contact with the inner side of the top of the cover. A combustion groove is provided on the top of the combustion platform. The ends of both the ignition assembly and the gas supply assembly are located inside the cover. The ignition assembly includes a spark plug, a mounting plate, a power supply, a transformer, a capacitor, an ignition coil, and a conductive wire. The spark plug is fixedly installed inside the cover. The mounting plate is fixedly installed on one side of the burner body. The power supply, transformer, and capacitor are respectively fixedly installed on the mounting plate. The output terminal of the power supply is connected to one end of the ignition coil. One end of the ignition coil is connected to the transformer. One end of the capacitor is electrically connected to the transformer. One end of the conductive wire is connected to the transformer, and the other end of the conductive wire is connected to one end of the spark plug.

[0008] Furthermore, the planar adjustment assembly includes a fixed frame, a first slider, a first drive mechanism for moving the first slider laterally, a second slider, and a second drive mechanism for moving the second slider vertically. The fixed frame is fixedly installed on one side of the top of the burner body. The first drive mechanism is fixedly installed on the fixed frame. The output end of the first drive mechanism is connected to the first slider. The inner side of the second slider is in contact with one side of the first slider. The second drive mechanism is fixedly installed on the top of the first slider. The output end of the second drive mechanism is connected to one end of the second slider. A connecting plate is also provided on one side of the second slider. The connecting plate is fixedly connected to the surface of the sample inlet tube.

[0009] Furthermore, the sample supply assembly includes a fixing plate, a liquid combustion sample supply box, a supply pump, a liquid extraction tube, and a liquid supply tube. The fixing plate is fixedly installed on one side of the combustion instrument body, the liquid combustion sample supply box is fixedly installed on the fixing plate, and the supply pump is fixedly installed inside the combustion instrument body. The two ends of the supply pump are respectively connected to the liquid extraction tube and the liquid supply tube. One end of the liquid extraction tube is connected to the inner cavity of the liquid combustion sample supply box, and one end of the liquid supply tube is connected to one end of the sample inlet tube.

[0010] Furthermore, the gas supply assembly includes a gas storage tank, a gas supply pipe, and a solenoid valve. The gas storage tank is fixedly installed on one side of the burner body. One end of the gas supply pipe is connected to the gas storage tank and is located inside the cover. The solenoid valve is fixedly installed on the surface of the gas supply pipe and is located above the combustion chamber of the combustion platform.

[0011] Furthermore, a lead wire assembly is also provided on one side of the top of the burner body; The lead wire assembly includes a guide frame, a connecting sleeve, a connecting rod, and a sliding sleeve. The guide frame is fixedly installed on the top of the burner body, the sliding sleeve is slidably installed on the guide frame, one end of the connecting rod is fixedly connected to the sliding sleeve, and the other end of the connecting rod is connected to the bottom ball joint of the connecting sleeve. The surface of the connecting sleeve is slidably connected to the liquid supply pipe and the conductive wire, respectively.

[0012] Furthermore, the drive mechanism includes a mounting base, a drive motor, a threaded screw, and a guide rod. The mounting base is fixedly mounted on one side of the fixed frame, the drive motor is fixedly mounted on the mounting base, the output end of the drive motor is fixedly connected to one end of the threaded screw, the threaded screw is rotatably mounted on the fixed frame, the surface of the threaded screw is threadedly connected to one end of the slider, and the guide rod is fixedly mounted on the fixed frame, the surface of the guide rod is slidably connected to one end of the slider.

[0013] Furthermore, the second driving mechanism includes a second mounting base, a second driving motor, and a second threaded screw. The second mounting base is fixedly mounted on the top of the first slider, the second driving motor is fixedly mounted on the second mounting base, the output end of the second driving motor is fixedly connected to one end of the second threaded screw, and the second threaded screw is threadedly connected to the middle of the second slider.

[0014] Furthermore, the surface of the liquid supply pipe is provided with a second solenoid valve, and both the first solenoid valve and the second solenoid valve are electromagnetic check valves.

[0015] Another aspect of the present invention provides a method for using an automated sample-feeding continuous combustion test apparatus, the method comprising the following steps.

[0016] S1. Instrument preparation and initial positioning: Place the combustion platform on top of the combustion instrument body, and adjust the initial position of the sample inlet tube through the plane adjustment component so that the sample inlet tube is directly above the combustion chamber of the combustion platform, and ensure that the spark plug of the ignition component, the gas outlet of the gas supply component, and the liquid outlet of the sample supply component are all in standby mode. S2. Sealing and Space Enclosure: By operating the plane adjustment component, the injection tube is moved downwards, causing the sealing plate fixed to the surface of the injection tube to move downwards with the injection tube until the sealing cover is fastened to the combustion platform, enclosing the combustion chamber, the end of the ignition component, and the end of the gas supply component. At this time, the injection tube remains relatively sealed and can slide inside the sealing cover. S3. Automatic sample injection below the liquid surface: When the sample supply component is started, the supply pump draws liquid sample from the liquid combustion sample supply box through the liquid extraction pipe and delivers it to the injection pipe through the liquid supply pipe. Driven by the plane adjustment component, the injection pipe extends into the combustion chamber of the combustion platform, and the end of the injection pipe is below the combustion liquid surface or just in contact with the liquid surface, and the liquid sample is directly injected below the liquid surface. S4. Continuous Combustion and Ignition Test: Turn on the gas supply component. The gas in the gas tank enters the sealed enclosure through the gas supply pipe and solenoid valve, located above the combustion chamber. Start the ignition component. The power supply outputs electrical energy, which is boosted by the ignition coil. In conjunction with the oscillating circuit composed of a transformer and capacitor, the high voltage is transmitted to the spark plug inside the enclosure through the conductive wire. The spark plug generates an electric spark in the sealed space. If the vapor concentration above the liquid surface reaches the flammability limit, it will be ignited. The temperature at this time is recorded by the sensor, which is the flash point or ignition point. S5. Reset and Exhaust: After the test, the sample inlet tube and the cover are lifted by the plane adjustment component, the combustion exhaust gas is discharged, the cover is separated from the combustion platform, and the test is ready for the next test. S6. Secondary Sample Supply and Ignition: Activate the sample supply component and inject the liquid sample directly below the liquid surface. Continue to fine-tune the plane adjustment component to ensure that the inner side of the top of the cover fits tightly with the top of the sealing plate, forming a relatively sealed test space. Let the combustion platform and the cover stand for a standard period of time to allow the combustion liquid to evaporate naturally in the sealed space, so that the vapor concentration above the liquid surface reaches the saturated vapor pressure at that temperature. Activate the gas supply component and the ignition component to ignite the liquid and conduct continuous testing.

[0017] Compared with related technologies, the automatic sample-injection continuous combustion test apparatus and its usage method provided by the present invention have the following beneficial effects: 1. Under the action of the plane adjustment component, the injection tube of this invention extends into the combustion chamber of the combustion platform, and the end of the injection tube is below or just in contact with the combustion liquid surface. The liquid is directly injected below the liquid surface, rather than sprayed in the air. The dynamic injection tube is designed to be injected below or just in contact with the combustion liquid surface, rather than sprayed above the liquid surface, to avoid the liquid atomizing or evaporating during the fall. For volatile liquids, this ensures that the injected amount is the weighed amount, ensuring mass conservation, and at the same time, keeping the distance between the injection tube and the liquid surface consistent each time the sample is injected.

[0018] 2. This invention outputs electrical energy from a power supply, which is boosted by an ignition coil. A transformer and capacitor-based oscillating circuit then transmit the high-voltage electricity to the spark plug inside the enclosure via a conductive wire. The spark plug generates an electric spark, igniting the liquid within the sealed space. If the vapor concentration above the liquid surface reaches the flammability limit, it will be ignited. Before secondary combustion ignition, the combustion platform and the enclosure are left to stand for a standard period, allowing the burning liquid to evaporate naturally within the sealed space, ensuring the vapor concentration above the liquid surface reaches the saturated vapor pressure at that temperature. Therefore, the measured flash point or ignition point is the true value at that temperature, rather than a false negative result caused by airflow disturbance carrying away vapor.

[0019] 3. During the up-and-down movement or vibration of the injection tube, the connecting sleeve connected to the liquid supply tube and the conductive wire will move accordingly. At the same time, the vertical displacement is absorbed by the sliding sleeve on the guide frame. The liquid supply tube and the conductive wire pass through the connecting sleeve, so that the pipeline will not be excessively pulled, bent or tangled due to the frequent up-and-down adjustment of the injection tube, thus protecting the precision pipeline and wires, and reducing the interference of mechanical vibration on the ignition accuracy. Attached Figure Description

[0020] Figure 1 Schematic diagram of the overall structure of the automatic sample-injection continuous combustion test apparatus provided by the present invention Figure 1 ; Figure 2 for Figure 1 The enlarged structural diagram at point A is shown below; Figure 3 Schematic diagram of the overall structure of the automatic sample-injection continuous combustion test apparatus provided by the present invention Figure 2 ; Figure 4 This is a schematic diagram of the internal structure of the combustion device body provided by the present invention; Figure 5 A cross-sectional structural schematic diagram of the automatic sample-feeding continuous combustion test apparatus provided by the present invention; Figure 6 for Figure 5 The enlarged structural diagram at point B is shown below; Figure 7 This is a schematic diagram of the structure of the planar adjustment component and the sample supply component provided by the present invention; Figure 8 for Figure 7 The enlarged structural diagram at point C is shown below; Figure 9 A flowchart illustrating the method of using the automatic sample-injection continuous combustion test apparatus provided by the present invention.

[0021] The diagram is labeled as follows: 1. Combustion apparatus body; 2. Combustion platform; 3. Sample inlet tube; 4. Sealing cover; 5. Sealing lifting plate; 6. Combustion chamber; 7. Spark plug; 8. Mounting plate; 9. Power supply; 10. Transformer; 11. Capacitor; 12. Ignition coil; 13. Conductive wire; 14. Fixing frame; 15. Slider one; 16. Slider two; 17. Connecting plate; 18. Fixing plate; 19. Liquid combustion sample supply box; 20. Supply pump; 21. Liquid extraction tube; 22. Liquid supply tube; 23. Gas storage tank; 24. Gas supply tube; 25. Solenoid valve one; 26. Guide frame; 27. Connecting sleeve; 28. Connecting rod; 29. ​​Sliding sleeve; 30. Mounting seat one; 31. Drive motor one; 32. Threaded screw one; 33. Guide rod; 34. Mounting seat two; 35. Drive motor two; 36. Threaded screw two; 37. Solenoid valve two. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please refer to the following: Figures 1-9 ,in, Figure 1 Schematic diagram of the overall structure of the automatic sample-injection continuous combustion test apparatus provided by the present invention Figure 1 ; Figure 2 for Figure 1 The enlarged structural diagram at point A is shown below; Figure 3 Schematic diagram of the overall structure of the automatic sample-injection continuous combustion test apparatus provided by the present invention Figure 2 ; Figure 4 This is a schematic diagram of the internal structure of the combustion device body provided by the present invention; Figure 5 A cross-sectional structural schematic diagram of the automatic sample-feeding continuous combustion test apparatus provided by the present invention; Figure 6 for Figure 5 The enlarged structural diagram at point B is shown below; Figure 7 This is a schematic diagram of the structure of the planar adjustment component and the sample supply component provided by the present invention; Figure 8 for Figure 7 The enlarged structural diagram at point C is shown below; Figure 9 A flowchart illustrating the method of using the automatic sample-injection continuous combustion test apparatus provided by the present invention.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] Example 1 In the specific implementation process, such as Figures 1-8 As shown, the continuous combustion test apparatus includes a combustion body 1, a combustion platform 2, an ignition assembly, a gas supply assembly, a sample supply assembly, a sample inlet tube 3, and a plane adjustment assembly for moving the sample inlet tube 3 in the up, down, left, and right directions. The combustion platform 2, ignition assembly, gas supply assembly, sample supply assembly, and plane adjustment assembly are all located on one side of the top of the combustion body 1. The sample inlet tube 3 is fixedly connected to the output end of the plane adjustment assembly and is connected to the output end of the sample supply assembly. A cover 4 is slidably connected to the surface of the sample inlet tube 3 and is fastened to the combustion platform 2. A sealing lifting plate 5 is also fixedly connected to the surface of the sample inlet tube 3. The top of the sealing lifting plate 5 is in contact with the inner side of the top of the cover 4. A combustion groove 6 is provided on the top of the combustion platform 2. The sealing plate 5, which is fixed on the surface of the injection tube 3, moves down with the injection tube 3 until the cover 4 is fastened to the combustion stage 2. The position of the sealing plate 5 is adjusted by the plane adjustment component. The inner side of the top of the cover 4 is tightly fitted with the top of the sealing plate 5 to form a relatively sealed space, which encloses the combustion chamber 6, the end of the ignition component and the end of the gas supply component. At this time, the injection tube 3 slides relatively inside the cover 4 but remains sealed.

[0027] The ends of both the ignition assembly and the gas supply assembly are located inside the enclosure 4; The ignition assembly includes a spark plug 7, a mounting plate 8, a power supply 9, a transformer 10, a capacitor 11, an ignition coil 12, and a conductive wire 13. The spark plug 7 is fixedly installed inside the cover 4. The mounting plate 8 is fixedly installed on one side of the burner body 1. The power supply 9, transformer 10, and capacitor 11 are respectively fixedly installed on the mounting plate 8. The output terminal of the power supply 9 is connected to one end of the ignition coil 12, one end of the ignition coil 12 is connected to the transformer 10, one end of the capacitor 11 is electrically connected to the transformer 10, and one end of the conductive wire 13 is connected to the transformer 10. The other end of 13 is connected to one end of spark plug 7. Power supply 9 outputs electrical energy, which is boosted by ignition coil 12. In conjunction with the oscillation circuit composed of transformer 10 and capacitor 11, the high voltage is transmitted to spark plug 7 inside the cover 4 through conductive wire 13. Spark plug 7 generates an electric spark and ignites in the sealed space. If the vapor concentration above the liquid surface reaches the flammability limit, it will be ignited. The instrument records the temperature at this time through a sensor (such as a flame detector or a temperature change sensor), which is the flash point or ignition point. After the test, the cover 4 is lifted, the combustion exhaust gas is discharged, and the test is prepared for the next test.

[0028] In some embodiments, the planar adjustment assembly includes a fixed frame 14, a slider 15, a drive mechanism 1 for moving slider 15 laterally, a slider 2 16, and a drive mechanism 2 for moving slider 2 16 vertically. The fixed frame 14 is fixedly installed on one side of the top of the burner body 1. The drive mechanism 1 is fixedly installed on the fixed frame 14. The output end of the drive mechanism 1 is connected to slider 15. The inner side of slider 2 16 is in contact with one side of slider 15. The drive mechanism 2 is fixedly installed on the top of slider 15. The output end of the drive mechanism 2 is connected to one end of slider 2 16. A connecting plate 17 is also provided on one side of slider 2 16. The connecting plate 17 is fixedly connected to the surface of the sample inlet tube 3. It should be noted that the drive mechanism includes a mounting base 30, a drive motor 31, a threaded screw 32, and a guide rod 33. The mounting base 30 is fixedly mounted on one side of the mounting frame 14. The drive motor 31 is fixedly mounted on the mounting base 30. The output end of the drive motor 31 is fixedly connected to one end of the threaded screw 32. The threaded screw 32 is rotatably mounted on the mounting frame 14. The surface of the threaded screw 32 is threadedly connected to one end of the slider 15. The guide rod 33 is fixedly mounted on the mounting frame 14. The surface of the guide rod 33 is slidably connected to one end of the slider 15.

[0029] It should be noted that the second drive mechanism includes a second mounting base 34, a second drive motor 35, and a second threaded screw 36. The second mounting base 34 is fixedly mounted on the top of the first slider 15, and the second drive motor 35 is fixedly mounted on the second mounting base 34. The output end of the second drive motor 35 is fixedly connected to one end of the second threaded screw 36. The second threaded screw 36 is threadedly connected to the middle of the second slider 16. The first drive motor 31 drives the first threaded screw 32 to rotate. The first slider 15 moves laterally under the thread action of the first threaded screw 32 and the limiting of the guide rod 33. The second drive motor 35 drives the second threaded screw 36 to rotate. The second slider 16 moves vertically under the thread action of the second threaded screw 36, thereby realizing the fine adjustment of the sample inlet tube 3 in the horizontal and vertical directions.

[0030] When the sample supply component is activated, the supply pump 20 draws liquid sample from the liquid combustion sample supply box 19 through the liquid extraction pipe 21, and delivers it to the injection pipe 3 through the liquid supply pipe 22. Driven by the plane adjustment component, the injection pipe 3 extends into the combustion tank 6 of the combustion platform 2, and the end of the injection pipe 3 is below or just in contact with the liquid surface. The liquid is directly injected below the liquid surface, rather than sprayed in the air. The dynamic injection pipe 3 is designed to be injected below (or just in contact with) the liquid surface, rather than sprayed above the liquid surface, to avoid the liquid from atomizing or evaporating during the fall. For volatile liquids, this ensures that the injected amount is the weighed amount, ensuring mass conservation, and at the same time, keeping the distance between the injection pipe 3 and the liquid surface consistent each time a sample is injected. Before secondary combustion ignition, the combustion platform 2 and the cover 4 are left to stand for a standard time, such as 5 minutes, to allow the burning liquid to evaporate naturally in the closed space, so that the vapor concentration above the liquid surface reaches the saturated vapor pressure at that temperature. This allows for control of ignition at different initial temperatures, so that the measured flash point or ignition point is the true value at that temperature, rather than a false negative result caused by airflow disturbance carrying away the vapor.

[0031] In some embodiments, the sample supply assembly includes a fixing plate 18, a liquid combustion sample supply box 19, a supply pump 20, a suction pipe 21, and a supply pipe 22. The fixing plate 18 is fixedly installed on one side of the burner body 1, the liquid combustion sample supply box 19 is fixedly installed on the fixing plate 18, the supply pump 20 is fixedly installed inside the burner body 1, the two ends of the supply pump 20 are respectively connected to the suction pipe 21 and the supply pipe 22, one end of the suction pipe 21 is connected to the inner cavity of the liquid combustion sample supply box 19, one end of the supply pipe 22 is connected to one end of the sample inlet pipe 3, and a solenoid valve 37 is provided on the surface of the supply pipe 22.

[0032] In some embodiments, the gas supply assembly includes a gas storage tank 23, a gas supply pipe 24, and a solenoid valve 25. The gas storage tank 23 is fixedly installed on one side of the burner body 1. One end of the gas supply pipe 24 is connected to the gas storage tank 23 and is located inside the cover 4. The solenoid valve 25 is fixedly installed on the surface of the gas supply pipe 24. The gas supply pipe 24 is located above the combustion chamber 6 of the combustion platform 2. Both the solenoid valve 25 and the solenoid valve 37 are electromagnetic check valves. The gas in the gas storage tank 23 enters the cover 4 through the gas supply pipe 24 and the solenoid valve 25, and is located above the combustion chamber 6.

[0033] Example 2 In some specific implementations, a guide frame 26, a connecting sleeve 27, a connecting rod 28, and a sliding sleeve 29 are also provided on one side of the top of the burner body 1. The guide frame 26 is fixedly installed on the top of the burner body 1, and the sliding sleeve 29 is slidably installed on the guide frame 26. One end of the connecting rod 28 is fixedly connected to the sliding sleeve 29, and the other end of the connecting rod 28 is connected to the bottom ball joint of the connecting sleeve 27. The surface of the connecting sleeve 27 is slidably connected to the liquid supply pipe 22 and the conductive wire 13, respectively. During the up-and-down movement or vibration of the sample injection pipe 3, the connecting sleeve 27 connected to the liquid supply pipe 22 and the conductive wire 13 will move accordingly. At the same time, the vertical displacement is absorbed by the sliding of the sliding sleeve 29 on the guide frame 26. The liquid supply pipe 22 and the conductive wire 13 pass through the connecting sleeve 27, so that the pipeline will not be excessively pulled, bent, or tangled due to the frequent up-and-down adjustment of the sample injection pipe 3, thus protecting the precision pipeline and wires and reducing the interference of mechanical vibration on the ignition accuracy.

[0034] Example 3 In some specific implementation processes, refer to Figure 9 As shown, a method for using an automatic sample-injection continuous combustion test apparatus includes the following steps.

[0035] S1. Instrument preparation and initial positioning: Place the combustion platform 2 on top of the combustion instrument body 1, and adjust the initial position of the sample inlet tube 3 through the plane adjustment component so that the sample inlet tube 3 is directly above the combustion chamber 6 of the combustion platform 2, and ensure that the spark plug 7 of the ignition component, the gas outlet of the gas supply component and the liquid outlet of the sample supply component are all in standby mode. S2, Sealing and Space Enclosure of Cover 4: By operating the plane adjustment component, the sample inlet tube 3 is moved downward, so that the sealing lifting plate 5 fixed on the surface of the sample inlet tube 3 moves downward with the sample inlet tube 3 until the cover 4 is fastened on the combustion platform 2, enclosing the combustion chamber 6, the end of the ignition component and the end of the gas supply component. At this time, the sample inlet tube 3 is relatively sealed and can slide inside the cover 4. S3. Automatic sample injection below the liquid surface: Start the sample supply component, and the supply pump 20 draws liquid sample from the liquid combustion sample supply box 19 through the liquid extraction pipe 21. The sample is then transported to the injection pipe 3 through the liquid supply pipe 22. Driven by the plane adjustment component, the injection pipe 3 extends into the combustion tank 6 of the combustion platform 2, and the end of the injection pipe 3 is below the combustion liquid surface or just in contact with the liquid surface. The liquid sample is directly injected below the liquid surface. S4. Continuous Combustion and Ignition Test: Turn on the gas supply component. The gas in the gas tank 23 enters the interior of the cover 4 through the gas supply pipe 24 and the solenoid valve 25, located above the combustion chamber 6. Start the ignition component. The power supply 9 outputs electrical energy, which is boosted by the ignition coil 12. With the help of the oscillation circuit composed of the transformer 10 and the capacitor 11, the high voltage is transmitted to the spark plug 7 inside the cover 4 through the conductive wire 13. The spark plug 7 generates an electric spark in the sealed space. If the vapor concentration above the liquid surface reaches the flammability limit, it will be ignited. The temperature at this time is recorded by the sensor, which is the flash point or ignition point. S5. Reset and exhaust: After the test, lift the sample inlet tube 3 and the cover 4 through the plane adjustment component, the combustion exhaust gas is discharged, the cover 4 is separated from the combustion platform 2, and the test is ready for the next test. S6. Secondary Sample Supply and Ignition: Start the sample supply component and inject the liquid sample directly below the liquid surface. Continue to fine-tune the plane adjustment component to ensure that the inner top of the cover 4 is tightly fitted with the top of the sealing lifting plate 5, forming a relatively sealed test space. Let the combustion platform 2 and the cover 4 stand still for a standard time to allow the combustion liquid to evaporate naturally in the sealed space, so that the vapor concentration above the liquid surface reaches the saturated vapor pressure at that temperature. Turn on the gas supply component and the ignition component to ignite the liquid and conduct continuous testing.

[0036] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic sample-feeding continuous combustion test apparatus, characterized in that, The device includes a burner body (1), a combustion platform (2), an ignition assembly, a gas supply assembly, a sample supply assembly, a sample inlet tube (3), and a plane adjustment assembly for moving the sample inlet tube (3) up, down, left, and right. The combustion platform (2), ignition assembly, gas supply assembly, sample supply assembly, and plane adjustment assembly are all located on one side of the top of the burner body (1). The sample inlet tube (3) is fixedly connected to the output end of the plane adjustment assembly. The sample inlet tube (3) is connected to the output end of the sample supply assembly. A cover (4) is slidably connected to the surface of the sample inlet tube (3). The cover (4) is fastened to the combustion platform (2). A sealing lifting plate (5) is also fixedly connected to the surface of the sample inlet tube (3). The top of the sealing lifting plate (5) is in contact with the inner side of the top of the cover (4). A combustion groove (6) is provided on the top of the combustion platform (2). The ends of the ignition assembly and the gas supply assembly are both located inside the cover (4); The ignition assembly includes a spark plug (7), a mounting plate (8), a power supply (9), a transformer (10), a capacitor (11), an ignition coil (12), and a conductive wire (13). The spark plug (7) is fixedly installed inside the cover (4). The mounting plate (8) is fixedly installed on one side of the burner body (1). The power supply (9), the transformer (10), and the capacitor (11) are respectively fixedly installed on the mounting plate (8). The output end of the power supply (9) is connected to one end of the ignition coil (12). One end of the ignition coil (12) is connected to the transformer (10). One end of the capacitor (11) is electrically connected to the transformer (10). One end of the conductive wire (13) is connected to the transformer (10). The other end of the conductive wire (13) is connected to one end of the spark plug (7).

2. The automatic sample feeding continuous combustion test apparatus according to claim 1, characterized in that, The planar adjustment assembly includes a fixed frame (14), a slider one (15), a drive mechanism one for driving slider one (15) to move laterally, a slider two (16), and a drive mechanism two for driving slider two (16) to move vertically. The fixed frame (14) is fixedly installed on one side of the top of the burner body (1). The drive mechanism one is fixedly installed on the fixed frame (14). The output end of the drive mechanism one is connected to slider one (15). The inner side of slider two (16) is in contact with one side of slider one (15). The drive mechanism two is fixedly installed on the top of slider one (15). The output end of the drive mechanism two is connected to one end of slider two (16). A connecting plate (17) is also provided on one side of slider two (16). The connecting plate (17) is fixedly connected to the surface of the injection tube (3).

3. The automatic sample feeding continuous combustion test apparatus according to claim 1, characterized in that, The sample supply assembly includes a fixed plate (18), a liquid combustion sample supply box (19), a supply pump (20), a liquid extraction tube (21), and a liquid supply tube (22). The fixed plate (18) is fixedly installed on one side of the burner body (1). The liquid combustion sample supply box (19) is fixedly installed on the fixed plate (18). The supply pump (20) is fixedly installed inside the burner body (1). The two ends of the supply pump (20) are respectively connected to the liquid extraction tube (21) and the liquid supply tube (22). One end of the liquid extraction tube (21) is connected to the inner cavity of the liquid combustion sample supply box (19). One end of the liquid supply tube (22) is connected to one end of the sample inlet tube (3).

4. The automatic sample feeding continuous combustion test apparatus according to claim 1, characterized in that, The gas supply assembly includes a gas storage tank (23), a gas supply pipe (24), and a solenoid valve (25). The gas storage tank (23) is fixedly installed on one side of the burner body (1). One end of the gas supply pipe (24) is connected to the gas storage tank (23). One end of the gas supply pipe (24) is located inside the cover (4). The solenoid valve (25) is fixedly installed on the surface of the gas supply pipe (24). The gas supply pipe (24) is located above the combustion chamber (6) of the combustion platform (2).

5. The automatic sample feeding continuous combustion test apparatus according to claim 1, characterized in that, A lead wire assembly is also provided on one side of the top of the burner body (1); The lead assembly includes a guide frame (26), a connecting sleeve (27), a connecting rod (28), and a sliding sleeve (29). The guide frame (26) is fixedly installed on the top of the burner body (1). The sliding sleeve (29) is slidably installed on the guide frame (26). One end of the connecting rod (28) is fixedly connected to the sliding sleeve (29), and the other end of the connecting rod (28) is connected to the bottom ball joint of the connecting sleeve (27). The surface of the connecting sleeve (27) is slidably connected to the liquid supply pipe (22) and the conductive wire (13).

6. The automatic sample feeding continuous combustion test apparatus according to claim 1, characterized in that, The drive mechanism includes a mounting base (30), a drive motor (31), a threaded screw (32), and a guide rod (33). The mounting base (30) is fixedly mounted on one side of the fixed frame (14). The drive motor (31) is fixedly mounted on the mounting base (30). The output end of the drive motor (31) is fixedly connected to one end of the threaded screw (32). The threaded screw (32) is rotatably mounted on the fixed frame (14). The surface of the threaded screw (32) is threadedly connected to one end of the slider (15). The guide rod (33) is fixedly mounted on the fixed frame (14). The surface of the guide rod (33) is slidably connected to one end of the slider (15).

7. The automatic sample feeding continuous combustion test apparatus according to claim 2, characterized in that, The second driving mechanism includes a second mounting base (34), a second driving motor (35), and a second threaded screw (36). The second mounting base (34) is fixedly mounted on the top of the first slider (15). The second driving motor (35) is fixedly mounted on the second mounting base (34). The output end of the second driving motor (35) is fixedly connected to one end of the second threaded screw (36). The second threaded screw (36) is threadedly connected to the middle of the second slider (16).

8. The automatic sample feeding continuous combustion test apparatus according to claim 7, characterized in that, The surface of the liquid supply pipe (22) is provided with a second solenoid valve (37), and both the first solenoid valve (25) and the second solenoid valve (37) are electromagnetic check valves.

9. A method of using the automatic sample-feeding continuous combustion test apparatus according to any one of claims 1-8, characterized in that, The method includes the following steps: S1. Instrument preparation and initial positioning: Place the combustion platform (2) on top of the combustion instrument body (1), and adjust the initial position of the sample inlet tube (3) through the plane adjustment component so that the sample inlet tube (3) is directly above the combustion tank (6) of the combustion platform (2), and ensure that the spark plug (7) of the ignition component, the gas outlet of the gas supply component and the liquid outlet of the sample supply component are all in standby mode. S2, Sealing (4) and Space Enclosure: Operate the plane adjustment component to move the injection tube (3) downward, so that the sealing lifting plate (5) fixed on the surface of the injection tube (3) moves down with the injection tube (3) until the sealing (4) is fastened on the combustion platform (2), enclosing the combustion tank (6), the end of the ignition component and the end of the gas supply component. At this time, the injection tube (3) is relatively sealed and can slide inside the sealing (4); S3, Automatic sample injection below the liquid surface: Start the sample supply component, and the supply pump (20) draws liquid sample from the liquid combustion sample supply box (19) through the liquid extraction pipe (21), and delivers it to the sample injection pipe (3) through the liquid supply pipe (22). Driven by the plane adjustment component, the sample injection pipe (3) extends into the combustion tank (6) of the combustion platform (2), and the end of the sample injection pipe (3) is below the combustion liquid surface or just in contact with the liquid surface, and the liquid sample is directly injected below the liquid surface. S4. Continuous combustion and ignition test: Turn on the gas supply component. The gas in the gas storage tank (23) enters the inside of the cover (4) through the gas supply pipe (24) and the solenoid valve (25), located above the combustion chamber (6). Start the ignition component. The power supply (9) outputs electrical energy, which is boosted by the ignition coil (12). With the help of the oscillation circuit composed of the transformer (10) and the capacitor (11), the high voltage is transmitted to the spark plug (7) inside the cover (4) through the conductive wire (13). The spark plug (7) generates an electric spark in the sealed space. If the vapor concentration above the liquid surface reaches the flammability limit, it will be ignited. The temperature at this time is recorded by the sensor, which is the flash point or ignition point. S5. Reset and exhaust: After the test, lift the sample tube (3) and the cover (4) through the plane adjustment component, exhaust gas is discharged, cover (4) is separated from the combustion platform (2), and the next test is prepared. S6. Secondary sample supply and ignition: Start the sample supply component and inject the liquid sample directly below the liquid surface. Continue to fine-tune the plane adjustment component so that the inner side of the top of the cover (4) is tightly attached to the top of the sealing lifting plate (5) to form a relatively closed test space. Let the combustion platform (2) and the cover (4) stand for a standard time to allow the combustion liquid to evaporate naturally in the closed space, so that the vapor concentration above the liquid surface reaches the saturated vapor pressure at that temperature. Turn on the gas supply component and the ignition component to ignite the liquid and conduct continuous testing.

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