Electrostatic sensitivity judgment system for liquid energetic material

Abstract

The utility model discloses an electrostatic sensitivity judgment system for a liquid energetic material. Comprising a closed-structure experiment cabin with a visual window on one side, a sample loading groove fixed in the middle of an inner cavity of the experiment cabin through a lower supporting assembly, electrostatic discharge equipment fixed at the upper part of the inner cavity of the experiment cabin through an upper supporting assembly, and a high-frame-rate camera arranged outside the experiment cabin, and the control module is connected with the high-frame-rate camera and the electrostatic discharge equipment through data lines. According to the judgment system, interference caused by evaporation of a liquid material when a residual sample and other methods are used for judgment is effectively avoided, as long as the liquid material participates in a reaction, fire lights with different colors are inevitably generated at the moment of discharge and in two frames after the discharge, and the system response judgment accuracy is high. The judging system provided by the utility model can be used for evaluating the safety risk of the liquid energetic material under the action of electrostatic discharge.

Description

Technical Field

[0001] This utility model relates to an electrostatic sensitivity determination system for liquid energetic materials, belonging to the field of electrostatic discharge safety evaluation of liquid energetic materials. Background Technology

[0002] For solid energetic materials, existing standard systems can be used to characterize parameters such as mechanical sensitivity, friction sensitivity, shock wave sensitivity, and thermal sensitivity during transportation, thus establishing a relatively complete safe transportation system. Nitroglycerin, a liquid energetic material, may carry electrostatic charges during flow and rotation due to its fluidity, volatility, and unique hazards. When these charges accumulate to an excessive level, electrostatic discharge may occur. If the energy of this discharge exceeds the critical stimulation level of the nitroglycerin, it may ignite, causing combustion or a combustion accident. Most existing standard systems, such as "Test Methods for Explosives" and "Test Methods for Pyrotechnics," are not applicable, lacking a comprehensive system of hazard parameter standards. Therefore, the understanding of the static safety threshold of nitroglycerin is incomplete. Given the current severe safety situation in the explosives industry, the expanding application areas of nitroglycerin, and the numerous and complex stimuli affecting safety, explosions may occur due to the coupling of multiple factors. To eliminate safety risks in specific processes, it is urgent to strengthen research on the static safety characteristics of nitroglycerin, providing safety thresholds and control methods for safe production and use.

[0003] Current electrostatic sensitivity testing primarily relies on GJB772A-1997 for ignition criteria, judging from sample residue, presence of decomposition, sound, and flame. However, most liquid materials are volatile, and after being placed in the electrostatic sensitivity testing device for a period of time, it's impossible to determine whether the sample reduction is due to evaporation or partial decomposition or reaction. This makes it impossible to effectively determine whether a response has occurred based on the amount of residual sample. Furthermore, the decomposition or combustion products of liquid samples are generally gaseous, with few solid residues, making it difficult to judge based on reaction residues. During the electrostatic ignition test, especially in discharge modes with low discharge resistance, the electrostatic discharge itself produces significant sound and light, potentially masking the sound and flame of liquid material combustion or explosion. Moreover, manual observation, especially of instantaneous processes, is inherently subjective and prone to error. Therefore, manually observing sound and flame is not an effective method for response determination.

[0004] In summary, to assess the safety risks of liquid energetic materials under electrostatic discharge, it is necessary to conduct electrostatic sensitivity tests on liquid materials and to design and develop an effective response determination system. Utility Model Content

[0005] The purpose of this invention is to provide a system for determining the electrostatic sensitivity of liquid energetic materials in order to assess the safety risks of liquid energetic materials under electrostatic discharge.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] This utility model discloses an electrostatic sensitivity determination system for liquid energetic materials, comprising a closed experimental chamber with a viewing window on one side, a sample loading slot fixed in the middle of the inner cavity of the experimental chamber by a lower support assembly, an electrostatic discharge device fixed in the upper part of the inner cavity of the experimental chamber by an upper support assembly, a high frame rate camera set outside the experimental chamber, and a control module connected to the high frame rate camera and the electrostatic discharge device by a data cable.

[0008] The sample container is used to hold energetic materials in the liquid to be tested.

[0009] The electrostatic discharge device is used to apply test static electricity to liquid energetic materials;

[0010] The high frame rate camera is used to capture images of liquid energetic materials during discharge;

[0011] The control module is used to control the electrostatic discharge device to apply test static electricity and to receive images taken by the high frame rate camera after electrostatic discharge.

[0012] The sample loading tank is made of reflective metal.

[0013] The high frame rate camera is required to have a frame rate of not less than 1000fps, and the width of the sample slot in the image must be not less than 50 pixels.

[0014] Work process

[0015] The energetic material in the liquid to be tested is placed into the sample loading tank. The high frame rate camera is aimed at the sample loading tank and takes pictures, with the width of the sample loading tank in the image being no less than 50 pixels. The control module controls the electrostatic discharge device to apply test static electricity and controls the high frame rate camera to capture video images 10ms before and after the moment of electrostatic discharge. The response of the sample is determined by whether a spark is generated within 2ms after the discharge, based on the images. If a spark is generated, the sample is considered to have responded; if no spark is generated, the sample is considered not to have responded.

[0016] Beneficial effects

[0017] This invention's determination system effectively avoids interference from liquid material evaporation when using methods such as residual samples for determination. As long as liquid material participates in the reaction, different colored flashes will inevitably be generated at the moment of discharge and in the two subsequent frames, resulting in high system response accuracy. This invention's determination system can be used to assess the safety risks of liquid energetic materials under electrostatic discharge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the determination system of this utility model;

[0019] In the diagram, 1-high frame rate camera, 2-experimental chamber, 3-sample loading tank, 4-electrostatic discharge equipment, 5-control module. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example

[0022] like Figure 1 As shown, the present invention provides an electrostatic sensitivity determination system for liquid energetic materials, comprising a closed experimental chamber 2 with a viewing window on one side, a sample loading slot 3 fixed in the middle of the inner cavity of the experimental chamber 2 by a lower support assembly, an electrostatic discharge device 4 fixed in the upper part of the inner cavity of the experimental chamber by an upper support assembly, a high frame rate camera 1 set outside the experimental chamber 2, and a control module 5 connected to the high frame rate camera 1 and the electrostatic discharge device 4 by a data cable.

[0023] The sample container 3 is used to hold the energetic material in the liquid to be tested.

[0024] The electrostatic discharge device 4 is used to apply test static electricity to liquid energetic materials;

[0025] The high frame rate camera 1 is used to capture images of liquid energetic materials during discharge;

[0026] The control module 5 is used to control the electrostatic discharge device 4 to apply test electrostatic discharge and to receive the images taken by the high frame rate camera 1 after electrostatic discharge.

[0027] The sample loading tank 3 is made of reflective metal.

[0028] The high frame rate camera 1 is required to have a frame rate of not less than 1000fps, and the width of the sample tray 3 in the image must be not less than 50 pixels.

[0029] Work process

[0030] The energetic material in the liquid to be tested is placed into the sample loading tank 3. The high frame rate camera 1 is aimed at the sample loading tank 3 and takes a picture, with the width of the sample loading tank 3 in the image not less than 50 pixels. The control module 5 controls the electrostatic discharge device 4 to apply test static electricity and controls the high frame rate camera 1 to capture video images 10ms before and after the instant of electrostatic discharge. The response of the sample is determined by whether a spark is generated within 2ms after the discharge based on the image. If a spark is generated, the sample is considered to have responded; if no spark is generated, the sample is considered not to have responded.

Claims

1. An electrostatic sensitivity determination system for a liquid energetic material, characterized by, The system comprises a closed structure experiment cabin with a visual window on one side, a sample loading groove fixed in the middle of the inner cavity of the experiment cabin through a lower support assembly, an electrostatic discharge device fixed in the upper part of the inner cavity of the experiment cabin through an upper support assembly, a high frame rate camera arranged outside the experiment cabin, and a control module connected with the high frame rate camera and the electrostatic discharge device through data lines. The sample loading groove is used for containing the liquid energetic material to be tested. The electrostatic discharge device is used for applying test static electricity to the liquid energetic material. The high frame rate camera is used for shooting the image of the liquid energetic material during discharge. The control module is used for controlling the electrostatic discharge device to apply test static electricity and receiving the picture shot by the high frame rate camera after electrostatic discharge.

2. A system for determining the electrostatic sensitivity of a liquid energetic material as defined in claim 1, wherein, The sample loading groove is made of a reflective metal.

3. The electrostatic sensitivity determination system for liquid energetic material according to claim 1, wherein the high frame rate camera requires a frame rate of not less than 1000 fps, and the width of the sample loading groove in the picture is not less than 50 pixel points.

Images