Method for collecting gas signal in vacuum closed cavity of energetic material kneading process

Abstract

The invention belongs to the technical field of safety of energetic materials, and particularly relates to a method for acquiring a gas signal in a vacuum closed cavity of an energetic material kneading process, which comprises the following steps: a sampling stage: opening a gas inlet valve, a gas pump and a gas exhaust valve, and extracting a gas sample from a top gas phase space of a vacuum kneading pot through the gas pump to enter a sampling pipeline; an analysis and exhaust stage: increasing the pressure in the sampling cavity of the gas detection device to an optimal working pressure range through the gas pump, analyzing the sample gas in the sampling pipeline by using the gas detection device, closing the gas inlet valve after the analysis is completed, and pushing the sample gas back into the vacuum kneading pot through the exhaust valve; in the reset stage, after exhausting is completed, the exhaust valve is closed. According to the method, real-time, accurate, reliable and safe monitoring on the concentration of the volatile solvent such as ethyl acetate can be realized under the high-vacuum closed extreme working condition, so that an indispensable technical guarantee is provided for refined and safe production of energetic materials.

Description

Technical Field

[0001] This invention belongs to the field of energetic materials safety technology, specifically relating to a method for collecting gas signals in a vacuum-sealed cavity during the kneading process of energetic materials. Background Technology

[0002] The kneading process of energetic materials such as propellants and explosives is a core step in their production, directly determining the energy performance, mechanical structure, and safety reliability of the final product. This process is typically carried out in a twin-paddle kneader, where a pair of meshing paddles subject a high-viscosity slurry containing solid oxidizers, metallic fuels, polymer binders, and functional additives to intense shearing, compression, and folding to ensure uniform molecular-level distribution of all components. Due to the stringent requirements for bubble reduction, impurities, and process consistency in energetic materials, the kneading process must be conducted under high vacuum, combined with heating, to efficiently remove ethyl acetate from the slurry. During this process, real-time and accurate monitoring of the gas concentration inside the vacuum kneading vessel is crucial for determining the process endpoint and ensuring safe production. However, reliably acquiring ethyl acetate gas signals under the unique vacuum and sealed conditions of energetic material kneading presents a more severe challenge than in ordinary chemical processes. The large pressure difference between the vacuum chamber and the outside environment can damage, deform, or leak sensors under these conditions, leading to inaccurate measurements or physical damage.

[0003] Therefore, there is an urgent need to design a gas collection method for a vacuum chamber specifically for the kneading process of energetic materials, in order to overcome the extreme working conditions of high vacuum and achieve real-time, accurate, reliable and safe monitoring of the concentration of volatile solvents such as ethyl acetate, thereby providing an indispensable technical guarantee for the refined and safe production of energetic materials. Summary of the Invention

[0004] This invention provides a method for acquiring gas signals in a vacuum-sealed cavity during the kneading process of energetic materials. This method can achieve real-time, accurate, reliable and safe monitoring of the concentration of volatile solvents such as ethyl acetate under extreme high-vacuum sealing conditions, thus providing an indispensable technical guarantee for the refined and safe production of energetic materials.

[0005] To achieve the above objectives, the present invention adopts the following specific technical solution: First, this invention provides a method for acquiring gas signals within a vacuum-sealed cavity during the kneading process of energetic materials. This signal acquisition method includes the following steps: Sampling stage: Open the air inlet valve, air pump and exhaust valve, and use the air pump to draw gas samples from the top gas phase space of the vacuum kneading pot and enter the sampling pipeline. Analysis and backflow stage: The pressure in the sampling chamber of the gas detection device is increased to the optimal working pressure range by the air pump, and the sample gas in the sampling pipeline is analyzed by the gas detection device. After the analysis is completed, the air inlet valve is closed, and the sample gas is pushed back into the vacuum kneading pot through the exhaust valve. Reset phase: After venting is complete, close the vent valve.

[0006] Furthermore, the sampling phase also includes: The air pressure in the sampling pipeline between the air inlet valve and the air pump is monitored in real time using an air pressure monitoring device. The real-time air pressure is compared with the preset vacuum air pressure threshold. When the real-time air pressure is greater than or equal to the preset vacuum air pressure threshold, the analysis and backflow stage begins.

[0007] Furthermore, when the real-time air pressure is lower than the preset vacuum air pressure threshold, the intake valve, exhaust valve, and air pump are immediately shut off.

[0008] Furthermore, a preparation stage is included before the sampling stage: closing the inlet and outlet valves and isolating the gas detection device from the vacuum kneading pot.

[0009] In addition, the present invention also provides a gas signal acquisition system in a vacuum-sealed cavity for performing the above-mentioned method of kneading energetic materials, characterized in that it includes an inlet valve, an air pump, a gas detection device, an exhaust valve, and a control module. Both the inlet valve and the outlet valve are connected to the main cavity of the vacuum kneading pot; the inlet valve, the air pump, the gas detection device, and the outlet valve are connected in sequence through pipelines to form a sampling pipeline; the outlet valve is used to discharge the detected gas in the sampling pipeline back into the main cavity of the vacuum kneading pot; The gas detection device is used to detect the target gas and convert the concentration of the detected target gas into an electrical signal; The control module is used to control the opening and closing of the intake valve, the air pump, the gas detection device, and the exhaust valve.

[0010] Furthermore, it also includes a pressure monitoring device that is signal-connected to the control module; The air pressure monitoring device is used to monitor the air pressure in the sampling pipeline between the air inlet valve and the air pump in real time. The control module is used to compare the real-time air pressure monitored by the air pressure monitoring device with a preset vacuum air pressure threshold. When the real-time air pressure is less than the preset vacuum air pressure threshold, the control module controls the intake valve, the exhaust valve and the air pump to close.

[0011] Furthermore, it also includes a display unit that is signal-connected to the control module; The display unit is used to display gas concentration and pressure information.

[0012] Furthermore, the gas detection device is equipped with a sensor chip for detecting the target gas and converting the concentration of the detected target gas into an electrical signal.

[0013] Furthermore, it also includes a power supply module for providing 12-24VDC power; The power supply module is electrically connected to the air pump, the air inlet valve, the air outlet valve, the gas detection device, the control module, the display unit, and the air pressure monitoring device.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: 1. It can fundamentally protect the probe of the gas detection device. The inlet and outlet valves are only opened during the sampling stage, so that the probe is in an isolated and protected state for more than 95% of the time. This completely avoids long-term exposure to vacuum, high temperature, high humidity and material contamination environment, and greatly extends the service life.

[0015] 2. Accurate and reliable measurement: The pressure in the sampling chamber of the gas detection device is increased to the optimal working pressure range by an air pump, so that the measurement is carried out in a stable environment close to atmospheric pressure, eliminating the influence of vacuum negative pressure on the performance of the gas detection device and ensuring measurement accuracy and consistency.

[0016] 3. Fast and lag-free response: Due to the small volume of the sampling chamber of the gas detection device and its proximity to the sampling point, sampling can be completed quickly through the gas pump. The gas signal response speed is much faster than the traditional long pipeline indirect sampling method.

[0017] 4. To ensure system safety, the sampling pipeline and the main cavity of the vacuum kneading pot form a closed loop design, preventing organic solvent gas from leaking into the working environment; at the same time, real-time and reliable data provide a solid basis for safe production and process control.

[0018] 5. The system features intelligent self-protection. Through the air pressure monitoring device, real-time air pressure monitoring and control module safety interlocking logic enable the signal acquisition system to have self-diagnosis and self-protection capabilities.

[0019] 6. The measurement process is controllable. By controlling air pressure as a key process parameter, it is ensured that each sampling analysis is carried out under preset safe and ideal pressure conditions, thereby further guaranteeing the reliability and repeatability of the data. Attached Figure Description

[0020] Figure 1 This is a flowchart of the gas signal acquisition method in a vacuum-sealed cavity during the kneading process of energetic materials according to the present invention. Figure 2This is a schematic diagram of the signal acquisition system for the gas signal acquisition method in a vacuum-sealed cavity during the kneading process of energetic materials, as described in this invention.

[0021] Figure label: 1-Signal acquisition system, 11-Inlet valve, 12-Air pump, 13-Gas detection device, 14-Exhaust valve, 15-Air pressure monitoring device, 16-Display unit, 17-Sampling pipeline, 18-Power supply module. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 This embodiment provides a method for acquiring gas signals within a vacuum-sealed cavity during the kneading process of energetic materials, such as... Figure 1 and Figure 2 As shown, this signal acquisition method is implemented using signal acquisition system 1 and includes the following steps: Preparation Phase: Close the inlet valve 11 and the exhaust valve 14 to isolate the gas detection device 13 from the vacuum kneading pot. During most of the kneading process, especially during stages where the material is subjected to strong shearing and high risk of splashing, both the inlet valve 11 and the exhaust valve 14 remain closed. At this time, the probe of the gas detection device 13 and its connected sampling pipeline 17 form a sealed, pressure-resistant sampling chamber isolated from the main cavity of the vacuum kneading pot, fundamentally protecting the precision probe and completely avoiding damage from vacuum, material contamination, and mechanical impact.

[0024] Sampling Stage: The inlet valve 11, air pump 12, and exhaust valve 14 are opened. Gas samples are drawn from the top gas phase space of the vacuum kneading pot using air pump 12 and introduced into sampling pipeline 17. The gas pressure monitoring device 15 monitors the gas pressure within sampling pipeline 17 between inlet valve 11 and air pump 12 in real time. The monitored real-time gas pressure is compared with a preset vacuum pressure threshold. If the real-time gas pressure is greater than or equal to the preset vacuum pressure threshold, the analysis and exhaust stage begins. If the real-time gas pressure is less than the preset vacuum pressure threshold, inlet valve 11, exhaust valve 14, and air pump 12 are immediately closed. When gas concentration needs to be measured, the control module starts sequentially. First, air pump 12 and inlet valve 11 are opened to draw gas samples from the top gas phase space of the vacuum kneading pot. During this process, the gas pressure monitoring device 15 monitors the gas pressure in sampling pipeline 17 in real time. When the gas pressure in the gas path is detected to be lower than the preset vacuum pressure threshold, it indicates that the vacuum inside the vacuum kneading pot is too high or there may be a leak in the gas path. The control module will immediately trigger the safety interlock logic: immediately close the inlet valve 11 and the exhaust valve 14, and stop the operation of the air pump 12, thereby effectively preventing damage to the air pump 12 that may be caused by continuous extraction of high vacuum gas, and avoiding the probe sensing element from being subjected to extreme vacuum conditions beyond its design range.

[0025] Analysis and backflow stage: The pressure in the sampling chamber of the gas detection device 13 is increased to the optimal working pressure range by the air pump 12, and the sample gas in the sampling pipeline 17 is analyzed by the gas detection device 13. After the analysis is completed, the inlet valve 11 is closed, and the sample gas is pushed back into the vacuum kneading pot through the exhaust valve 14. If the gas pressure monitoring device 15 monitors the gas pressure in the sampling pipeline 17 in real time and finds it to be normal, the air pump 12 continues to work, quickly increasing the pressure in the sampling chamber to the optimal working pressure range of the sensor. Subsequently, the probe performs rapid and accurate analysis of the sample gas under ideal conditions. After the analysis is completed, the inlet valve 11 is closed, the exhaust valve 14 is opened, and the sample gas is pushed back into the vacuum kneading pot to ensure the system is sealed.

[0026] Reset Phase: After venting is complete, close vent valve 14. The control module resets all components, and the probe is once again in an isolated protection state, awaiting the next measurement cycle.

[0027] The above signal acquisition method enables real-time, accurate, reliable and safe monitoring of the concentration of volatile solvents such as ethyl acetate under extreme working conditions of high vacuum and sealing, thus providing an indispensable technical guarantee for the refined and safe production of energetic materials.

[0028] Example 2 This invention provides a gas signal acquisition system 1 for a vacuum-sealed cavity in an energetic material kneading process, used to perform the gas signal acquisition method in the vacuum-sealed cavity of the energetic material kneading process described in Embodiment 1 above. Figure 2As shown, the signal acquisition system 1 includes an inlet valve 11, an air pump 12, a gas detection device 13, an exhaust valve 14, a gas pressure monitoring device 15, a display unit 16, a power supply module 18, and a control module. The air pump 12 and the inlet valve 11, connected by pipelines between the vacuum kneading pot and the gas detection device 13, constitute a gas sampling unit. The gas detection device 13 constitutes a signal acquisition and processing unit, specifically a probe, which integrates a sensor chip suitable for detecting target gases (such as ethyl acetate) to convert gas concentration into an electrical signal. The exhaust valve 14, connected to the outlet of the gas detection device 13, constitutes a gas return and purification unit, which can return the detected gas to the vacuum chamber of the vacuum kneading pot (connected to the "exhaust" port).

[0029] Both the intake valve 11 and the exhaust valve 14 are connected to the main cavity of the vacuum kneading pot, such as Figure 2 The air inlet and exhaust positions both represent the main cavity of the vacuum kneading pot; the air inlet valve 11, air pump 12, gas detection device 13 and exhaust valve 14 are connected in sequence through pipelines to form sampling pipeline 17; the exhaust valve 14 is used to discharge the detected gas in the sampling pipeline 17 back into the main cavity of the vacuum kneading pot.

[0030] The gas detection device 13 is used to detect the target gas and convert the concentration of the detected target gas into an electrical signal. The gas detection device 13 is equipped with a sensor chip for detecting the target gas and converting the concentration of the detected target gas into an electrical signal. The gas detection device 13 can be a gas sensor or a probe.

[0031] The air pressure monitoring device 15 is connected to the control module via signal; the air pressure monitoring device 15 is used to monitor the air pressure in the sampling pipeline 17 between the air inlet valve 11 and the air pump 12 in real time, and the air pressure monitoring device 15 can be a gas pressure sensor.

[0032] The display unit 16 is connected to the control module and is used to display gas concentration and pressure information locally or remotely. The display unit 16 can be a display or a display terminal.

[0033] The power supply module 18 provides 12-24VDC power to the entire signal acquisition system 1. The power supply module 18 is electrically connected to the air pump 12, the inlet valve 11, the exhaust valve 14, the gas detection device 13, the control module, the display unit 16, and the air pressure monitoring device 15. The control module can control the power supply to switch the air pump 12, the inlet valve 11, and the exhaust valve 14 on and off.

[0034] The control module is used to control the opening and closing of the intake valve 11, the air pump 12, the gas detection device 13 and the exhaust valve 14. It is also used to compare the real-time air pressure monitored by the air pressure monitoring device 15 with the preset vacuum air pressure threshold. When the real-time air pressure is less than the preset vacuum air pressure threshold, the control module controls the intake valve 11, the exhaust valve 14 and the air pump 12 to close.

[0035] The signal acquisition method and system 1 described above fundamentally protect the probe of the gas detection device 13. The inlet valve 11 and exhaust valve 14 are only opened during the sampling phase, ensuring the probe is in isolation protection for over 95% of the time. This completely avoids long-term exposure to vacuum, high temperature, high humidity, and material contamination environments, significantly extending its service life. The air pump 12 raises the pressure within the sampling chamber of the gas detection device 13 to its optimal operating pressure range, allowing measurement in a stable environment close to atmospheric pressure. This eliminates the impact of vacuum negative pressure on the performance of the gas detection device 13, ensuring measurement accuracy and consistency. Because the sampling chamber of the gas detection device 13 is small and close to the sampling point, sampling can be completed quickly via the air pump 12, resulting in a gas signal response speed far faster than traditional long-pipeline indirect sampling methods. The sampling pipeline 17 forms a closed-loop design with the main cavity of the vacuum kneading pot, preventing organic solvent gas from leaking into the working environment. Simultaneously, real-time and reliable data provides a solid basis for safe production and process control. The real-time air pressure monitoring and control module uses the air pressure monitoring device 15 to implement safety interlocking logic, enabling the signal acquisition system 1 to have self-diagnosis and self-protection capabilities.

[0036] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

[0037] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for acquiring gas signals within a vacuum-sealed cavity during the kneading process of energetic materials, characterized in that, include: Sampling stage: Open the air inlet valve, air pump and exhaust valve, and use the air pump to draw gas samples from the top gas phase space of the vacuum kneading pot and enter the sampling pipeline. Analysis and backflow stage: The pressure in the sampling chamber of the gas detection device is increased to the optimal working pressure range by the air pump, and the sample gas in the sampling pipeline is analyzed by the gas detection device. After the analysis is completed, the air inlet valve is closed, and the sample gas is pushed back into the vacuum kneading pot through the exhaust valve. Reset phase: After venting is complete, close the vent valve.

2. The signal acquisition method as described in claim 1, characterized in that, The sampling phase also includes: The air pressure in the sampling pipeline between the air inlet valve and the air pump is monitored in real time using an air pressure monitoring device. The real-time air pressure is compared with the preset vacuum air pressure threshold. When the real-time air pressure is greater than or equal to the preset vacuum air pressure threshold, the analysis and backflow stage begins.

3. The signal acquisition method as described in claim 2, characterized in that, When the real-time air pressure is lower than the preset vacuum air pressure threshold, the intake valve, exhaust valve, and air pump will be shut off immediately.

4. The signal acquisition method according to any one of claims 1-3, characterized in that, The sampling stage is preceded by a preparation stage: closing the inlet and outlet valves and isolating the gas detection device from the vacuum kneading pot.

5. A gas signal acquisition system for a vacuum-sealed cavity in an energetic material kneading process for performing the method described in any one of claims 1-4, characterized in that, It includes an intake valve, an air pump, a gas detection device, an exhaust valve, and a control module; Both the inlet valve and the outlet valve are connected to the main cavity of the vacuum kneading pot; the inlet valve, the air pump, the gas detection device, and the outlet valve are connected in sequence through pipelines to form a sampling pipeline; the outlet valve is used to discharge the detected gas in the sampling pipeline back into the main cavity of the vacuum kneading pot; The gas detection device is used to detect the target gas and convert the concentration of the detected target gas into an electrical signal; The control module is used to control the opening and closing of the intake valve, the air pump, the gas detection device, and the exhaust valve.

6. The signal acquisition system as described in claim 5, characterized in that, It also includes a pressure monitoring device that is signal-connected to the control module; The air pressure monitoring device is used to monitor the air pressure in the sampling pipeline between the air inlet valve and the air pump in real time. The control module is used to compare the real-time air pressure monitored by the air pressure monitoring device with a preset vacuum air pressure threshold. When the real-time air pressure is less than the preset vacuum air pressure threshold, the control module controls the intake valve, the exhaust valve and the air pump to close.

7. The signal acquisition system as described in claim 6, characterized in that, It also includes a display unit that is signal-connected to the control module; The display unit is used to display gas concentration and pressure information.

8. The signal acquisition system as described in claim 5, characterized in that, The gas detection device is equipped with a sensor chip for detecting target gas and converting the concentration of the detected target gas into an electrical signal.

9. The signal acquisition system as described in claim 7, characterized in that, It also includes a power supply module for providing 12-24VDC power; The power supply module is electrically connected to the air pump, the air inlet valve, the air outlet valve, the gas detection device, the control module, the display unit, and the air pressure monitoring device.

Images