Oxygen index testing device

Abstract

The utility model provides an oxygen index testing device which comprises a combustion cylinder, a nitrogen storage tank, an oxygen storage tank and a computer control system, and the oxygen storage tank and the nitrogen storage tank are connected with a first gas guide pipe and a second gas guide pipe respectively. The end, away from the oxygen storage tank, of the first gas-guide pipe and the end, away from the nitrogen storage tank, of the second gas-guide pipe are connected with the bottom of the combustion cylinder. A first mass flow controller is arranged on the first gas guide pipe, and a second mass flow controller is arranged on the second gas guide pipe; a sample bracket is arranged in the combustion cylinder, and a clamping device is arranged at the upper end of the sample bracket; a camera is arranged on one side of the combustion cylinder; an igniter is arranged on the combustion cylinder; and an automatic feeding device is arranged on one side of the combustion cylinder. By means of the automatic feeding device, continuous automatic feeding of a plurality of samples can be achieved, no operator is needed in the feeding process, the automation degree is high, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of fabric detection, in particular to an oxygen index testing device. Background Art

[0002] Oxygen index refers to the minimum oxygen concentration that just maintains the combustion of the material when a mixture of oxygen and nitrogen is introduced under specified test conditions, expressed as a volume fraction. The oxygen index is a common method used to evaluate the relative flammability of plastics, fibers and other polymer materials. The test principle and process are as follows: a sample is vertically fixed in a transparent combustion tube with an upward flow of oxygen and nitrogen mixed gas, the top of the sample is ignited, and the combustion characteristics of the sample are observed. The continuous combustion time or the length of the sample combustion is compared with the given criterion, and the minimum value of the oxygen concentration is estimated through a series of tests under different oxygen concentrations.

[0003] The existing oxygen index testers on the market have the following main problems: 1. Each time a test is performed, the operator is required to manually fix the sample in the combustion tube, which is not automated enough and is cumbersome to operate. 2. In the traditional operation method, during the combustion test, the operator is required to observe and record the burning conditions of the flame in real time, which is inconvenient to operate. Furthermore, since the test is conducted only by the operator's naked eye, it is impossible to leave first-hand pictures and video materials, which can easily cause controversy over the test results. Summary of the invention

[0004] The utility model aims to solve the deficiencies of the prior art and provide an oxygen index testing device.

[0005] The purpose of the utility model is achieved through the following technical solutions: an oxygen index testing device, comprising a combustion tube, a nitrogen storage tank, an oxygen storage tank, and a computer control system, wherein the oxygen storage tank and the nitrogen storage tank are respectively connected with a first air guide pipe and a second air guide pipe, and an end of the first air guide pipe away from the oxygen storage tank and an end of the second air guide pipe away from the nitrogen storage tank are simultaneously connected to the bottom of the combustion tube; a first mass flow controller is provided on the first air guide pipe, and a second mass flow controller is provided on the second air guide pipe;

[0006] The upper end of the combustion tube is open, a sample holder is arranged in the combustion tube, and a clamping device for clamping the sample is arranged at the upper end of the sample holder; a camera is arranged on one side of the combustion tube; an igniter for igniting the sample is arranged on the combustion tube;

[0007] An automatic loading device for automatically placing the sample into the combustion tube is arranged on one side of the combustion tube.

[0008] Preferably, an exhaust device is provided above the combustion tube, an air duct is connected to the exhaust device, and a smoke analysis device is provided at one end of the air duct away from the exhaust device.

[0009] Preferably, the combustion tube is equipped with glass beads, a metal mesh is provided above the glass beads, and the metal mesh is located below the clamping device.

[0010] Preferably, the automatic loading device includes a vertical telescopic device, which is located on one side of the combustion tube; a motor is provided at the upper end of the vertical telescopic device, a turntable is connected to the output shaft of the motor, the turntable is horizontally arranged, and a plurality of horizontal telescopic devices are provided in the circumferential direction of the turntable, the horizontal telescopic device is arranged along the radial direction of the turntable, a connecting rod is provided on the horizontal telescopic device, and a clamping component is provided at the lower end of the connecting rod.

[0011] Preferably, at least 15 horizontal telescopic devices are arranged on the turntable.

[0012] Preferably, the vertical telescopic device and the horizontal telescopic device are both electric push rods.

[0013] Preferably, the clamping device is an electric clamping device.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model can realize continuous automatic loading of multiple samples through the automatic loading device. During the loading process, no operator participation is required, the degree of automation is high, and time and labor are saved.

[0016] 2. The utility model accurately controls the flow rates of oxygen and nitrogen through the first mass flow controller and the second mass flow controller, thereby improving the reliability of the test results.

[0017] 3. The utility model records the entire combustion process of the sample in the combustion tube through a camera, and transmits the test process to the computer control system. The operator can observe the entire test process at the remote computer control end, and the test process can be saved in the computer as a favorable support for the test results.

[0018] 4. The utility model is provided with a flue gas analysis device, which can analyze the flue gas after the sample is burned, and is helpful for analyzing the chemical composition of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0021] Figure 3 This is a schematic diagram of the utility model when the sample is automatically placed into the combustion tube through the automatic loading device.

[0022] In the figure: 1. base, 2. computer control system, 3. oxygen storage tank, 4. first air duct, 5. first mass flow controller, 6. nitrogen storage tank, 7. second air duct, 8. second mass flow controller, 9. combustion tube, 10. sample holder, 11. clamping device, 12. metal mesh, 13. igniter, 14. glass beads, 15. exhaust device, 16. air duct, 17. flue gas analysis device, 18. turntable, 19. horizontal telescopic device, 20. sample, 21. connecting rod, 22. clamping component, 23. vertical telescopic device, 24. motor, 25. camera, 26. camera holder. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0024] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0025] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0026] like Figures 1 to 3As shown, an oxygen index testing device includes a combustion tube 9, a nitrogen storage tank 6, an oxygen storage tank 3, and a computer control system 2. The combustion tube 9, the nitrogen storage tank 6, and the oxygen storage tank 3 are all arranged on a base 1. Nitrogen and oxygen are stored in the nitrogen storage tank 6 and the oxygen storage tank 3, respectively. The oxygen storage tank 3 and the nitrogen storage tank 6 are respectively connected with a first air guide pipe 4 and a second air guide pipe 7. The end of the first air guide pipe 4 away from the oxygen storage tank 3 and the end of the second air guide pipe 7 away from the nitrogen storage tank 6 are simultaneously connected to the bottom of the combustion tube 9. A first mass flow controller 5 is provided on the first air guide pipe 4, and a second mass flow controller 8 is provided on the second air guide pipe 7. The first mass flow controller 5 is used to accurately control the flow rate of oxygen, and the second mass flow controller 8 is used to accurately control the flow rate of nitrogen. Through the accurate control of the flow rates of oxygen and nitrogen by the first mass flow controller 5 and the second mass flow controller 8, the mixing ratio of oxygen and nitrogen introduced into the combustion tube 9 can be accurately controlled. The first mass flow controller 5 and the second mass flow controller 8 are both electrically connected to the computer control system 2.

[0027] The combustion tube 9 is cylindrical, and the upper end of the combustion tube 9 is open. A sample holder 10 is provided in the combustion tube 9, and a clamping device 11 for clamping the sample 20 is provided at the upper end of the sample holder 10. In the utility model, the clamping device 11 is an electric clamping device 11, and the computer control system 2 can control the electric clamping device 11 to clamp or release the sample 20.

[0028] The combustion tube 9 is equipped with glass beads 14, and a metal mesh 12 is arranged above the glass beads 14, and the metal mesh 12 is located below the clamping device 11. After being introduced from the bottom of the combustion tube 9, oxygen and nitrogen will flow upward, and will pass through the gaps between the glass beads 14 during the upward flow. Since the gaps between the glass beads 14 are randomly distributed, the two gases will be fully mixed when passing through the gaps between the randomly distributed glass beads 14.

[0029] A camera 25 is provided on one side of the combustion tube 9. The camera 25 is set on a camera bracket 26. The camera 25 is electrically connected to the computer system. The camera 25 is used to record the entire process of the combustion test of the sample 20 and transmit the video or picture to the computer control system 2.

[0030] The combustion tube 9 is provided with an igniter 13 for igniting the sample 20. The igniter 13 uses a gas such as butane or propane as fuel and generates a flame, and the flame of the igniter 13 is used to ignite the upper end of the sample 20.

[0031] An exhaust device 15 is provided above the combustion tube 9 , and an air duct 16 is connected to the exhaust device 15 . A smoke analysis device 17 is provided at one end of the air duct 16 away from the exhaust device 15 .

[0032] An automatic loading device for automatically placing the sample 20 into the combustion tube 9 is provided on one side of the combustion tube 9. The automatic loading device includes a vertical telescopic device 23, which is located on one side of the combustion tube 9. A motor 24 is provided at the upper end of the vertical telescopic device 23, and a turntable 18 is connected to the output shaft of the motor 24. The turntable 18 is arranged horizontally and driven to rotate by the motor 24. Several horizontal telescopic devices 19 are provided in the circumferential direction of the turntable 18, and the horizontal telescopic devices 19 are arranged along the radial direction of the turntable 18. In the utility model, at least 15 horizontal telescopic devices 19 are provided on the turntable 18. A connecting rod 21 is provided on the horizontal telescopic device 19, and the connecting rod 21 is arranged along the vertical direction. A material clamping component 22 is provided at the lower end of the connecting rod 21. Among them, the material clamping component 22 is an ordinary clamp, and the material clamping component 22 clamps the upper end of the sample 20 with a certain clamping force. When the sample 20 is subjected to a certain pulling force downward, it will break away from the material clamping component 22. In the present invention, the vertical telescopic device 23 and the horizontal telescopic device 19 are both electric push rods.

[0033] The sample 20 of the present invention can be a textile with a certain hardness, or a plastic sheet.

[0034] The method of using the utility model is as follows: the operator fixes a plurality of samples 20 to be tested on the clamping member 22 in advance, and clamps the upper end of the sample 20 through the clamping member 22; when loading, the clamping device 11 in the combustion tube 9 is first in an open state, and the motor 24 drives the turntable 18 to rotate, and one of the samples 20 is rotated to correspond to the combustion tube 9, and then the horizontal telescopic device 19 is extended and the sample 20 is moved to the top of the combustion tube 9, and then the vertical telescopic device 23 is lowered to make the sample 20 enter the combustion tube 9, and the lower end of the sample 20 is located at the clamping position of the clamping device 11, and after the clamping device 11 clamps the lower end of the sample 20, the vertical telescopic device 23 rises and resets, and the horizontal telescopic device 19 shrinks to the initial state;

[0035] The upper end of the sample 20 is ignited by the igniter 13, and at the same time, the first mass flow controller 5 and the second mass flow controller 8 control oxygen and nitrogen to pass into the combustion tube 9 at a set flow rate. The camera 25 captures the combustion state of the sample 20 in the combustion tube 9 and sends the entire test process in the form of a video to the computer control system 2. The operator can observe the entire test process at the computer control end and record the experimental process; the test process video obtained by the camera 25 will be saved in the computer control system 2 as a strong support for the test structure; during the combustion test, the smoke generated by the combustion will enter the smoke analysis device 17 through the exhaust device 15, and the smoke analysis device 17 can analyze the gas types in the smoke, which is helpful to study the chemical composition of the test material.

[0036] After the test of the current sample 20 is completed, the motor 24 drives the turntable 18 to rotate a certain angle so that the next sample 20 to be tested is aligned with the combustion tube 9, and then the sample 20 is placed in the combustion tube 9 in the same way.

[0037] The utility model has the following beneficial effects:

[0038] 1. The utility model can realize continuous automatic loading of multiple samples 20 through the automatic loading device. No operator is required to participate in the loading process, with a high degree of automation, saving time and labor.

[0039] 2. The utility model uses the first mass flow controller 5 and the second mass flow controller 8 to accurately control the flow of oxygen and nitrogen, thereby improving the reliability of the test results.

[0040] 3. The utility model records the entire combustion process of the sample 20 in the combustion tube 9 through the camera 25, and transmits the test process to the computer control system 2. The operator can observe the entire test process at the remote computer control end, and the test process can be saved in the computer as a favorable support for the test results.

[0041] 4. The utility model is provided with a flue gas analysis device 17 , which can analyze the flue gas after the combustion of the sample 20 , and is helpful for analyzing the chemical composition of the sample 20 .

[0042] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. An oxygen index testing device, characterized in that: It includes a combustion tube, a nitrogen storage tank, an oxygen storage tank, and a computer control system. The oxygen storage tank and the nitrogen storage tank are respectively connected with a first air guide pipe and a second air guide pipe. One end of the first air guide pipe away from the oxygen storage tank and one end of the second air guide pipe away from the nitrogen storage tank are both connected to the bottom of the combustion tube. The first air guide pipe is provided with a first mass flow controller, and the second air guide pipe is provided with a second mass flow controller. The upper end of the combustion tube is open, a sample holder is arranged in the combustion tube, and a clamping device for clamping the sample is arranged at the upper end of the sample holder; a camera is arranged on one side of the combustion tube; an igniter for igniting the sample is arranged on the combustion tube; An automatic loading device for automatically placing the sample into the combustion tube is arranged on one side of the combustion tube.

2. The oxygen index testing device according to claim 1, characterized in that: An exhaust device is provided above the combustion tube, and an air duct is connected to the exhaust device. A smoke analysis device is provided at one end of the air duct away from the exhaust device.

3. The oxygen index testing device according to claim 1, characterized in that: The combustion tube is provided with glass beads, a metal net is arranged above the glass beads, and the metal net is located below the clamping device.

4. The oxygen index testing device according to claim 1, characterized in that: The automatic loading device includes a vertical telescopic device, which is located on one side of the combustion tube; a motor is provided at the upper end of the vertical telescopic device, a turntable is connected to the output shaft of the motor, the turntable is horizontally arranged, and a plurality of horizontal telescopic devices are provided in the circumferential direction of the turntable, the horizontal telescopic device is arranged along the radial direction of the turntable, a connecting rod is provided on the horizontal telescopic device, and a clamping component is provided at the lower end of the connecting rod.

5. The oxygen index testing device according to claim 4, characterized in that: At least 15 horizontal telescopic devices are arranged on the turntable.

6. The oxygen index testing device according to claim 4, characterized in that: The vertical telescopic device and the horizontal telescopic device are both electric push rods.

7. The oxygen index testing device according to claim 1, characterized in that: The clamping device is an electric clamping device.

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