A calibration and control method for a long-term storage stability testing system for explosives.

Abstract

This invention provides a calibration and control subsystem for a long-term storage stability testing system for explosives. The subsystem includes a main control module connected to a furnace temperature measurement module, a furnace temperature control module, a pressure measurement module, a calibration module, a communication module, and a status alarm module. A power supply module is connected to each of these modules. This calibration and control subsystem enables dynamic monitoring of the decomposition pressure of samples in 32 reaction vessels across four furnaces at different temperatures throughout the entire process. The subsystem employs a high-accuracy platinum resistance temperature sensor and a segmented PID temperature control algorithm to achieve low overshoot, rapid, and long-term high-stability constant temperature control across the four furnaces, providing a stable temperature field environment for sample decomposition.

Description

Technical Field

[0001] This invention belongs to the field of explosives technology and relates to explosives performance testing, specifically to a calibration and control method for a long-term storage stability testing system for explosives. Background Technology

[0002] Explosives are a major strategic resource and security foundation for the nation, as well as a significant potential source of danger for national security, public safety, and environmental safety. Their fundamental characteristics include easy decomposition, flammability, explosiveness, and sympathetic detonation. Explosives decompose upon heating and are prone to chain reactions leading to explosion. Stability refers to the ability of explosives to maintain their performance within permissible ranges under certain conditions, delaying decomposition, hydrolysis, oxidation, and autocatalytic reactions. It is a key technical indicator for evaluating the safety of explosives during research, production, transportation, storage, and use. Accurately understanding and evaluating the stability of explosives is crucial for developing safety control measures, effectively preventing and reducing industry safety risks, and ensuring the safe research, development, production, and use of explosive products.

[0003] The current domestic technical system and standard methods for evaluating the stability of explosives were established in the 1960s and 70s based on the imported color-changing test paper method. Explosives R&D, production, storage, and user units currently use methyl violet and Vieri color-changing test paper methods as standard methods for stability testing. This technical and methodological system is at the level of qualitative testing and semi-quantitative criteria, lagging behind advanced quantitative stability evaluation technologies abroad and mismatched with the development of advanced explosives technology in my country, leading to problems such as misjudgment and inability to evaluate. The domestic gas-based stability evaluation method mainly uses vacuum stability testing. This method is a typical two-point discontinuous result method, evaluating stability based on the starting and ending states. The discontinuous testing process makes it impossible to grasp the decomposition process and laws of explosives; measuring thermal decomposition under vacuum conditions does not match the actual state of the product; and it cannot measure volatile samples. Currently, there are no domestic methods and instruments for evaluating the long-term storage stability of explosives based on dynamic pressure monitoring, and corresponding calibration and control methods have not been reported. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a calibration and control method for a long-term storage stability testing system for explosives, thereby solving the technical problem that the accuracy of stability testing in the existing technology needs to be further improved.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A calibration and control method for a long-term storage stability testing system for explosives, comprising the following steps: Step 1, Temperature Calibration: During temperature calibration, the default settings are a minimum temperature of 40℃, a maximum temperature of 160℃, and a total of 9 calibrations. After calibration begins, the furnace body is heated sequentially from low to high: 40℃, 55℃, 70℃, 85℃, 100℃, 115℃, 130℃, 145℃, and 160℃. The time-temperature curve of the furnace body is plotted in real time. The working state of the calibration and control subsystem is "waiting for constant temperature". Once the difference between the detection results of the test temperature sensor and the detection results of the calibration device temperature sensor stabilizes, the working state of the calibration and control subsystem is "system constant temperature".

[0006] The calibration and measurement and control subsystem maintains a constant temperature at the current temperature point for 30 minutes, and takes the average data within 30 minutes as the furnace body temperature and calibration temperature at the current temperature point. The furnace body temperature and calibration temperature at the 9 temperature points are listed in a table. The calibration algorithm is used to calculate the temperature calibration coefficient. Based on the calibration results, the calibration coefficient is either discarded or issued. After the calibration coefficient is issued, subsequent tests are conducted to calibrate the measured temperature based on the calibration coefficient.

[0007] Step 2, Pressure Calibration: Pressure calibration involves simultaneously calibrating eight sealed reactors within a single furnace. The default settings range from a minimum pressure of 5 kPa to a maximum of 300 kPa, with 13 calibration points. After calibration begins, the pressure is increased sequentially from low to high: 5 kPa, 10 kPa, 20 kPa, 50 kPa, 100 kPa, 125 kPa, 150 kPa, 175 kPa, 200 kPa, 225 kPa, 250 kPa, 275 kPa, and finally 300 kPa. The pressure of the eight sealed reactors and the calibration pressure are monitored in real time. Once the difference between the test pressure and the calibration pressure stabilizes, the test pressure and calibration pressure at the current pressure point are recorded. This process continues until all 13 pressure points have been tested. The calibration algorithm is then used to calculate the pressure calibration coefficient. Based on the calibration results, the calibration coefficient can be either discarded or issued. After the calibration coefficient is issued, subsequent tests calibrate the measured pressure according to the calibration coefficient.

[0008] Step 3, Temperature Control and Pressure Measurement: First, select the furnace to be tested. Based on the testing requirements, set up to five different temperature points and sample program heating control processes for different durations. Set the test duration and temperature, maximum safe temperature and maximum safe pressure, and pressure sampling interval. Then, begin the long-term storage stability test of the explosives, recording and mapping the pressure-time curves corresponding to the furnace temperature and the pressure values ​​of the eight sealed reactors. After the test, the calibration and control subsystem will display a "Test Completed" status and save the test data.

[0009] The present invention also has the following technical features: Specifically, the calibration and control subsystem includes a main control module, which is connected to a furnace temperature measurement module, a furnace temperature control module, a pressure measurement module, a calibration module, a communication module, and a status alarm module. The power supply module is connected to the main control module, the furnace temperature measurement module, the furnace temperature control module, the pressure measurement module, the calibration module, the communication module, and the status alarm module, respectively.

[0010] The main control module is used to receive instructions from the host computer and simultaneously call various modules to control, measure, and process data.

[0011] The furnace temperature measurement module is used to measure the furnace body temperature through a platinum resistance temperature sensor, and the furnace temperature is measured using a resistance ratio temperature measurement method.

[0012] The furnace temperature control module is used to control the heater through a segmented PID temperature control method, reducing temperature overshoot, shortening temperature stabilization time, and achieving rapid and long-term stable control of the furnace temperature.

[0013] The pressure measurement module is used to measure the gas pressure inside the constant-volume reaction vessel via a pressure sensor.

[0014] The calibration module is used to perform temperature and pressure calibration. It uses the measured values ​​of a more accurate standard temperature sensor and the stable air pressure value output by the pressure controller as the standard for temperature and pressure, and compares and calibrates them with the measured values ​​of the calibration and measurement and control subsystem.

[0015] The aforementioned communication module is used for communication between the host computer and the main control module, as well as between various modules.

[0016] The aforementioned status alarm module is used to issue an alarm when the furnace body overheats to above 200°C, indicating a dangerous condition.

[0017] The power module is used to supply power to each module and provide a reference voltage.

[0018] Specifically, the long-term storage stability testing system for explosives includes a pressure measurement module, which includes at least one reactor and at least one pressure measurement transmission tube. One end of each pressure measurement transmission tube is connected to the gas outlet at the top of the reactor, and the other end of each pressure measurement transmission tube is connected to the measurement port of a pressure sensor.

[0019] It also includes a constant temperature heating module, which includes an outer shell, an inner stainless steel sleeve, a furnace support plate at the bottom of the stainless steel sleeve, a furnace body mounted on the furnace support plate via a furnace body bracket, a heater for heating the furnace body mounted on the furnace support plate, and at least one reactor heating chamber installed inside the furnace body. Each reactor heating chamber is coaxially provided with a movable insulation sleeve, the top of which extends to the top of the outer shell. The reactor can enter the reactor heating chamber through the movable insulation sleeve and be heated by the constant temperature heating module.

[0020] Compared with the prior art, the present invention has the following technical effects: (I) The calibration and control method of the present invention provides a dedicated measurement and control and calibration method for the long-term storage stability tester of explosives.

[0021] (II) The calibration and control method of the present invention realizes the integration of dynamic monitoring of the decomposition pressure of samples in 32 reaction vessels of 4 heating furnaces at different temperatures and temperature and pressure calibration functions, which is convenient for users to operate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the long-term storage stability testing system for explosives.

[0023] Figure 2 This is a schematic diagram of the internal structure of a long-term storage stability testing system for explosives.

[0024] Figure 3 This is a schematic diagram of the overall structure of the reactor.

[0025] Figure 4 This is a schematic diagram of the gas pressure measurement transmission tube.

[0026] Figure 5 This is a schematic diagram showing the connection between the gas pressure measurement transmission tube, the reactor, and the pressure sensor.

[0027] Figure 6 This is a schematic diagram of the external structure of the movable insulation sleeve.

[0028] Figure 7 This is a schematic diagram of the internal structure of the movable insulation sleeve.

[0029] Figure 8 This is a schematic diagram of the calibration and measurement and control subsystem.

[0030] Figure 9 This is a flowchart illustrating the calibration and measurement control methods.

[0031] Figure 10 This is a flowchart illustrating the long-term storage stability test method for explosives.

[0032] Figure 11 yes Figure 10 Pressure-time curves of typical explosive samples at 110℃ in the method.

[0033] The meanings of the labels in the diagram are as follows: 1-reactor, 2-pressure measurement and transmission pipe, 3-pressure sensor, 4-outer shell, 5-furnace support, 6-furnace body, 7-heater, 8-reactor heating chamber, 9-movable insulation sleeve, 10-glass fiber outer insulation cylinder, 11-glass fiber inner insulation cylinder, 12-stainless steel sleeve, 13-top ceramic insulation plate, 14-furnace body support plate.

[0034] 101-Volume reaction tube, 102-Fastening nut, 103-Gas guide head, 104-Sealing ring, 105-Capillary pressure transmission tube, 106-Reinforcing layer, 107-Heat sink, 108-Connecting hole, 109-Fastening screw.

[0035] 201-Pressure transmission sleeve, 202-Pressure probe, 203-Connector, 204-Connecting nut, 205-Protective sleeve, 206-Sheath tube, 207-Screw.

[0036] 901-Fixed base, 902-Insulation sleeve, 903-Metal cover, 904-Annular heat insulation cover, 905-Reactor through cavity.

[0037] 90101-Inner cylinder, 90102-Annular support base, 90103-First lower boss, 90104-First upper boss.

[0038] 90401 - Second lower boss, 90402 - Second upper boss.

[0039] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, all components and equipment in this invention are based on components and equipment known in the prior art.

[0041] The principle of the long-term storage stability testing system for explosives based on dynamic pressure monitoring is to characterize the thermal decomposition reaction process of explosives within a highly sealed reaction vessel by continuously and in real-time measuring the change in gas pressure generated by the thermal decomposition of explosives under isothermal conditions over time, thereby achieving the stability evaluation of explosives. The testing instrument can be divided into three functional modules: a constant-temperature furnace module, a reaction testing module, and a calibration and control subsystem module. The constant-temperature furnace module provides a constant temperature environment for sample stability testing; the reaction testing module provides a sealed, constant-volume environment and pressure transmission measurement channel for sample testing; and the calibration and control subsystem module is the core of the testing instrument, controlling the overall measurement, temperature control, and external communication. The testing instrument includes four furnaces, each containing eight reactor heating chambers for holding eight sealed reaction vessels, which are connected to a pressure measurement unit. The calibration and control subsystem of the long-term storage stability test system for explosives based on dynamic pressure monitoring proposed in this invention has the following advantages for evaluating the long-term storage stability of explosives using the gas-based method: 1. Accurate temperature measurement and control; 2. Real-time and accurate measurement of pressure inside the reaction vessel during the test process; 3. Simultaneous monitoring of 32 samples from 4 furnaces.

[0042] To address the current lack of domestic methods for evaluating the stability of explosives using the gas-volume method with continuous real-time pressure monitoring, a calibration and control subsystem was established. This subsystem comprises a power supply module, a main control module, a communication module, a furnace temperature control module, a furnace temperature measurement module, a pressure measurement module, a status alarm module, and a calibration module. Design and control methods for this subsystem were proposed. A segmented PID temperature control method was employed to control the heater, and a resistance ratio temperature measurement method was used for temperature control and measurement. This enabled rapid and accurate control and measurement of different constant temperatures of samples in 32 reaction vessels across four furnaces during explosive stability testing. Furthermore, it allowed for independent, real-time, and continuous monitoring of the gas pressures generated by the decomposition of the 32 samples, ensuring no interference between them. This lays the foundation for understanding the decomposition process and patterns of explosives using the gas-volume method.

[0043] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0044] Example 1: This embodiment provides a calibration and control subsystem for a long-term storage stability testing system for explosives, such as... Figure 8 As shown, the calibration and measurement and control subsystem includes a main control module, which is connected to a furnace temperature measurement module, a furnace temperature control module, a pressure measurement module, a calibration module, a communication module, and a status alarm module. The power supply module is connected to the main control module, the furnace temperature measurement module, the furnace temperature control module, the pressure measurement module, the calibration module, the communication module, and the status alarm module, respectively.

[0045] The main control module receives instructions from the host computer and calls various modules for control, measurement, and data processing. In this embodiment, the main control module uses an STM32 DRM processor. Through program logic control, it receives parameter setting instructions from the host computer and calls various modules for control, measurement, and data processing. This includes calling the power supply module and status alarm module to cut off the power and trigger audible and visual alarms in emergency situations; calling the communication module to complete communication requests from the host computer and send measurement data to the host computer; calling the furnace temperature control module to raise the furnace body to the temperature set by the host computer; calling the furnace temperature measurement module to measure the furnace body temperature in real time; calling the pressure measurement module to measure the pressure inside the reaction vessel in real time; and calling the calibration module to calibrate the temperature and pressure measurements before the experiment.

[0046] The furnace temperature measurement module measures the furnace body temperature using a platinum resistance temperature sensor, employing a resistance ratio method. In this embodiment, a PT100 platinum resistance temperature sensor is used. The resistance ratio method uses a voltage divider circuit composed of a platinum resistance resistor and a reference resistor to measure the voltage ratio rather than the absolute voltage value, eliminating circuit drift and improving accuracy. Finally, based on the relationship between resistance and temperature, the measured temperature value is calculated through resistance value transformation.

[0047] In this embodiment, the furnace temperature measurement module uses a PT100 platinum resistance temperature sensor with an accuracy class of 1 / 10B in the range of 0–300℃ to measure the furnace body temperature. Temperature measurement is achieved using a resistance ratio method. A voltage divider circuit is composed of a platinum resistance resistor and a reference resistor, measuring the voltage ratio rather than the absolute voltage value to eliminate circuit drift and improve accuracy. Finally, the temperature is determined by measuring the change in resistance value. The resistance of the PT100 changes with temperature according to the following relationship: Where A = 3.9083 × 10 -3 ℃ -1 B = -5.775 × 10 -7 ℃ -2 R0 = 100Ω. In this invention, the constant current source outputs 1mA. Based on the system's temperature measurement range of 50℃~150℃, the platinum resistance varies from 119.40Ω to 157.33Ω, resulting in a voltage signal range of 119.40mV~157.33mV. A metal foil resistor with an accuracy of 0.1% and a temperature drift coefficient of ±2ppm / °C is used as the reference resistor. Furthermore, an amplifier ZJA3601, meeting the high-precision differential amplification requirements of the platinum resistance signal, amplifies the voltage across the platinum resistance and the reference resistor to obtain the reference resistor R0. REF The voltage value V across the platinum resistance thermometer PT ,according to The resistance value of the platinum resistance sensor is measured and calculated. Finally, an 8-channel 24-bit analog-to-digital converter is used to convert the signal from analog to digital and transmit the data to the main control module. An interpolation algorithm is then used to calculate the temperature, which is then used as the real-time temperature of each furnace.

[0048] The furnace temperature control module controls the heater using a segmented PID temperature control method, reducing temperature overshoot, shortening temperature stabilization time, and achieving rapid and long-term stable temperature control of the furnace body. In this embodiment, when the difference between the user-set control temperature and the temperature measured by the temperature sensor is different, the furnace body is heated at different heating rates: when the temperature difference is large, the maximum heating rate is used for rapid heating; when the temperature difference is small, the heating rate is reduced to reduce temperature overshoot, and a larger proportional term is used for temperature control; when the temperature difference is very small, a smaller proportional term is used to further reduce temperature overshoot and quickly stabilize to the set temperature until the temperature stabilizes at the set temperature.

[0049] In this embodiment, specifically, when the difference ∆T between the user-set temperature Ta and the current furnace body temperature Tc measured by the PT100 temperature sensor is greater than 5℃, the temperature control system rapidly heats the furnace body with the highest heating power of 400W (corresponding to a temperature rise rate of 5℃ / min); when ∆T is less than 5℃, the actual temperature difference ∆T is used as the control input of the PID controller, and a larger proportional term is used when ∆T is greater than 1℃, and a smaller proportional term is used when ∆T is between 0℃ and 1℃, ensuring that the power supplemented is smaller as the difference between the set temperature and the current temperature becomes smaller, thereby effectively reducing overshoot, especially in the process of constant temperature control, which can effectively reduce temperature fluctuations.

[0050] The pressure measurement module is used to measure the gas pressure inside the constant-volume reaction vessel via a pressure sensor, which employs a high-precision miniature pressure transmitter. In this embodiment, to meet the requirement of simultaneously, in real-time, and accurately measuring the pressure inside eight reaction vessels from a single furnace, an eight-channel signal acquisition circuit is used for each furnace, and eight sets of pressure sensor signals are acquired and measured sequentially using a time-division multiplexing method.

[0051] Specifically, in this embodiment, the pressure measurement module uses a high-precision micro-pressure transmitter to measure the gas pressure inside the constant-volume reaction vessel. To meet the requirement of simultaneously measuring the pressure inside eight reaction vessels in real time from a single furnace body, and to satisfy the accuracy requirements of pressure measurement, an 8-channel 24-bit low-power Σ-Δ signal acquisition circuit DD7172 is used to convert the pressure signal. The eight sets of pressure sensor signals are acquired and measured sequentially using a time-division multiplexing method, and a voltage regulator is used to limit the amplitude of the pressure sensor signals, thereby protecting the high-precision signal acquisition circuit.

[0052] The calibration module is used for temperature and pressure calibration. It uses the measured values ​​of a more accurate standard temperature sensor and the stable air pressure value output by the pressure controller as the standard for temperature and pressure, and compares and calibrates them with the measured values ​​of the calibration and measurement and control subsystem.

[0053] Specifically, in this embodiment, temperature calibration uses a higher-precision second-class standard platinum resistance temperature sensor as the standard temperature meter to accurately measure the furnace temperature controlled by the stability tester and calibrate the temperature deviation. Pressure calibration uses a high-accuracy pressure controller to generate stable air pressure as the standard input value, records the air pressure measurement error of the stability tester, and calibrates the error.

[0054] The communication module is used for communication between the host computer and the main control module, as well as between other modules. In this embodiment, the communication module adopts an RS232 serial communication circuit, which is used for the physical communication link between the host computer and the main control module, the sending of parameter setting commands from the host computer to the slave computer, and the uploading of measurement data from the slave computer to the host computer. It has the advantages of strong anti-interference ability, stable and reliable data transmission, and fast transmission speed.

[0055] The status alarm module is used to alarm when the furnace body overheats to above 200°C, indicating a dangerous situation. In this embodiment, based on different abnormal conditions identified by the main control module, two solutions are adopted: setting the relay's PWM wave signal to a low level throughout the entire cycle to deactivate the heater, and directly cutting off the physical connection between the 220V power supply and the heater.

[0056] Specifically, in this embodiment, the status alarm module primarily addresses the dangerous situation of the furnace body overheating to above 200°C by displaying indicator flashes and buzzer alarms, and providing emergency handling. To address the furnace body overheating problem caused by a damaged temperature sensor failing to accurately measure the furnace body temperature, multiple temperature sensors are used to monitor the furnace body temperature in real time. When the temperature sensor measures a furnace body temperature higher than the set safe temperature threshold, the STM32 will set the PWM wave signal of the control relay to a low level throughout its entire cycle, deactivating the heater and thus reporting the cause of the temperature exceeding the threshold while ensuring the normal operation of the test system control circuit. To address the furnace body overheating problem caused by an STM32 embedded software crash leading to a failure of the temperature control program and continuous high-level output, or by a solid-state relay failing due to unpredictable reasons and remaining in a conducting state, a ceramic thermal protector is connected to the live wire of the heater's power supply and directly fixed to the furnace body. When the furnace body temperature exceeds the safe temperature threshold, the ceramic thermal protector directly opens its internal bimetallic strip, cutting off the physical connection between the 220V power supply and the heater.

[0057] The power supply module is used to power each module and provide a reference voltage. In this embodiment, the power supply module is based on a high-precision linear power supply, supplemented by a high-performance linear buck LDO (Low Dropout Regulator) chip to power each module. At the same time, a low-noise, high-precision reference voltage circuit is used to provide a stable reference voltage for the analog-to-digital converter and constant current source circuit.

[0058] The calibration and measurement and control subsystem of this invention enables dynamic monitoring of the decomposition pressure of samples in 32 reaction vessels across 4 furnaces at different temperatures throughout the entire process.

[0059] The calibration and measurement control subsystem of this invention uses a platinum resistance temperature sensor with high measurement accuracy and a segmented PID temperature control algorithm to achieve low overshoot, fast, long-term high stability constant temperature control for four furnaces, providing a stable temperature field environment for sample decomposition.

[0060] The calibration and control subsystem of this invention uses a platinum resistance temperature sensor with high measurement accuracy and the resistance ratio method, and applies a high-precision, low-temperature-drift reference resistor to achieve accurate measurement of the body temperature of four furnaces.

[0061] The calibration and measurement and control subsystem of this invention uses a high-precision micro pressure transmitter and an 8-channel 24-bit low-power Σ-Δ signal acquisition circuit to achieve real-time and high-accuracy acquisition of the pressure inside 32 reaction vessels of 4 furnaces.

[0062] Example 2: This embodiment provides a calibration and control method for a long-term storage stability testing system for explosives. This method uses the calibration and control subsystem of the long-term storage stability testing system for explosives given in Embodiment 1.

[0063] like Figure 9 As shown, the method includes the following steps: Step 1, Temperature Calibration: In this embodiment, the system undergoes temperature and pressure calibration at the factory, and is subsequently calibrated at fixed intervals during use. It communicates with a host computer via a communication module.

[0064] In this embodiment, temperature calibration mode is used for temperature calibration, and the temperature calibration mode is available for users to select in the form of a tab.

[0065] During temperature calibration, the default settings are a minimum temperature of 40℃, a maximum temperature of 160℃, and a total of 9 calibrations. After calibration begins, the furnace body is heated sequentially from low to high: 40℃, 55℃, 70℃, 85℃, 100℃, 115℃, 130℃, 145℃, and 160℃. The time-temperature curve of the furnace body is plotted in real time. The working state of the calibration and control subsystem is "waiting for constant temperature". Once the difference between the detection results of the test temperature sensor and the detection results of the calibration device temperature sensor stabilizes, the working state of the calibration and control subsystem is "system constant temperature".

[0066] The calibration and measurement and control subsystem maintains a constant temperature at the current temperature point for 30 minutes, and takes the average data within 30 minutes as the furnace body temperature and calibration temperature at the current temperature point. The furnace body temperature and calibration temperature at the 9 temperature points are listed in a table. The calibration algorithm is used to calculate the temperature calibration coefficient. Based on the calibration results, the calibration coefficient is either discarded or issued. After the calibration coefficient is issued, subsequent tests are conducted to calibrate the measured temperature based on the calibration coefficient.

[0067] In this embodiment, the calibration algorithm used is a commonly known calibration algorithm in the art.

[0068] In this embodiment, specifically during temperature calibration, the main control module receives temperature calibration control parameters from the user, including furnace serial number, number of temperatures, series temperature values, and temperature control duration. The main control module calls the furnace temperature control module to control the furnace temperature rise according to the first temperature value parameter of the first furnace. The furnace maintains a stable temperature value within the temperature control duration. During the temperature stabilization process, the main control module calls the furnace temperature measurement module to simultaneously collect the temperature measurement value of the platinum resistance temperature sensor and the temperature standard value of the second-class standard platinum resistance temperature sensor of the standard temperature meter, and sends them to the host computer to calculate and record the temperature difference between the two. The main control module calls the furnace temperature control module to control the furnace temperature rise according to the second temperature value parameter, and repeats the above operation until all the set series temperature values ​​are measured and recorded. The measurement error of the platinum resistance temperature sensor at the series temperature corresponding to the first furnace and its drift coefficient over time are obtained and compensated for. In this way, the temperature calibration is completed for the remaining three furnaces, realizing the temperature calibration of the four constant temperature furnaces of the stability tester.

[0069] Step 2, Pressure Calibration: In this embodiment, pressure calibration mode is used for pressure calibration, and the pressure calibration mode is available for users to select in the form of a tab.

[0070] Pressure calibration involves simultaneously calibrating eight sealed reactors within a single furnace. The default settings range from a minimum pressure of 5 kPa to a maximum of 300 kPa, with 13 calibration points. After calibration begins, the pressure is increased sequentially from low to high: 5 kPa, 10 kPa, 20 kPa, 50 kPa, 100 kPa, 125 kPa, 150 kPa, 175 kPa, 200 kPa, 225 kPa, 250 kPa, 275 kPa, and finally 300 kPa. The pressure of the eight sealed reactors and the calibration pressure are monitored in real time. Once the difference between the test pressure and the calibration pressure stabilizes, the test pressure and calibration pressure at the current pressure point are recorded. This process continues until all 13 pressure points have been tested. The calibration algorithm is then used to calculate the pressure calibration coefficient. Based on the calibration results, the calibration coefficient can be either discarded or issued. After the calibration coefficient is issued, subsequent tests calibrate the measured pressure according to the calibration coefficient.

[0071] In this embodiment, specifically during pressure calibration, the main control module receives pressure calibration control parameters from the user, including the furnace serial number, number of pressures, and series pressure values. The main control module calls the calibration module to control the standard pressure gauge to pressurize the eight reaction vessels according to the first pressure value parameter of the first furnace. The main control module calls the pressure measurement module to collect the pressure measurement values ​​of the corresponding eight pressure sensors and the setting values ​​of the standard pressure gauge, sends them to the host computer to calculate and record the eight pressure differences. The main control module then calls the calibration module to control the pressurization of the eight reaction vessels of the first furnace according to the second pressure value parameter, repeating the above operations until all the set series pressure values ​​are measured. The pressure measurement errors of the eight reaction vessels under the series pressure are recorded and compensated for. This process is repeated for the remaining three furnaces, achieving pressure calibration of the four constant temperature furnaces in the stability tester.

[0072] Step 3, Temperature Control and Pressure Measurement: First, select the furnace to be tested. Based on the testing requirements, set up to five different temperature points and sample program heating control processes for different durations. Set the test duration and temperature, maximum safe temperature and maximum safe pressure, and pressure sampling interval. Then, begin the long-term storage stability test of the explosives, recording and mapping the pressure-time curves corresponding to the furnace temperature and the pressure values ​​of the eight sealed reactors. After the test, the calibration and control subsystem will display a "Test Completed" status and save the test data.

[0073] In this specific embodiment, taking the user-set parameters as follows: Furnace No. 1 operates at a constant temperature of 60℃ for 48 hours, with a temperature anomaly threshold of 200℃ and an ambient temperature of 25℃ as an example. The main control module calls the furnace temperature measurement module to measure the current furnace temperature as 25℃, and feeds back the current temperature value of 25℃ to the main control module. The main control module determines that the difference between 25℃ and the set temperature of 60℃ is greater than 5℃, and calls the furnace temperature control module to heat the furnace from 25℃ to 60℃ at the highest heating power of 400W (corresponding to a temperature rise rate of 5℃ / min) until the temperature measurement value of the furnace temperature measurement module is greater than 55℃. The main control module then uses the actual temperature difference as the control input of the PID method. When the temperature difference is greater than 1℃, a larger proportional term is used for heating; when the temperature difference is between 0℃ and 1℃, a smaller proportional term is used for heating. The above temperature control method is used throughout the 48-hour constant temperature process. When the measurement value of the furnace temperature measurement module is ≥200℃, the main control module calls the status alarm module to disconnect the power supply, stop heating, and simultaneously flash the lights and sound the buzzer alarm.

[0074] In this specific embodiment, we take the pressure change of a sample after decomposition in eight reaction vessels during a 48-hour constant-temperature operation of furnace No. 1 at 60°C, with the sample decomposition temperature at 55°C, as an example. To more clearly describe the complete decomposition process, the pressure values ​​inside the eight reaction vessels are measured in real time as soon as the furnace starts heating, and these pressure values ​​are uploaded to the host computer in real time. When the temperature has not reached the sample decomposition temperature of 55°C, the pressure inside the reaction vessels remains basically at atmospheric pressure. As the temperature continues to rise to 60°C and stabilizes, the pressure inside the reaction vessels shows a significant upward trend as the sample decomposition gas is generated. This pressure value remains basically stable until the sample no longer decomposes and produces gas, at which point the set 48-hour period ends. The test is then completed, and the furnace temperature is automatically lowered to room temperature.

[0075] Example 3: This embodiment provides a long-term storage stability testing system for explosives, such as... Figure 1 As shown, it includes a pressure measurement module, which includes at least one reactor 1 and at least one pressure measurement transmission tube 2. One end of each pressure measurement transmission tube 2 is connected to the air outlet at the upper end of the reactor 1, and the other end of each pressure measurement transmission tube 2 is connected to the measurement port of the pressure sensor 3.

[0076] like Figure 2As shown, it also includes a constant temperature heating module, which includes a housing 4, inside which is fitted a stainless steel sleeve 12. A furnace support plate 14 is provided at the bottom of the stainless steel sleeve 12. A furnace body 6 is installed on the furnace support plate 14 via a furnace body bracket 5. A heater 7 for heating the furnace body 6 is installed on the furnace support plate 14. At least one reactor heating chamber 8 is installed inside the furnace body 6. A movable insulation sleeve 9 is coaxially provided on each reactor heating chamber 8. The top of the movable insulation sleeve 9 extends to the top of the housing 4. The reactor 1 can enter the reactor heating chamber 8 through the movable insulation sleeve 9 and be heated by the constant temperature heating module.

[0077] As one specific solution in this embodiment, such as Figure 3 As shown, it includes a top-open constant-volume reaction tube 101, with a gas guide head 103 covering the opening of the constant-volume reaction tube 101 by a fastening nut 102. Sealing rings 104 are respectively provided between the constant-volume reaction tube 101 and the fastening nut 102 and between the constant-volume reaction tube 101 and the gas guide head 103. The gas guide head 103 is connected to the lower end of the capillary pressure transmission tube 105, and the upper end of the capillary pressure transmission tube 105 is connected to one end of the pressure measurement transmission tube 2. The capillary pressure transmission tube 105 is covered with a reinforcing layer 106, and the upper section of the reinforcing layer 106 is set as a heat sink 107.

[0078] In this embodiment, the constant volume reaction tube 101 is cylindrical with an inner diameter of 8.5 mm, an outer diameter of 20 mm, a height of 110 mm, a bottom thickness of 2 mm, and an internal volume of 25 ml ± 0.5 ml, and is used to hold the explosive sample.

[0079] In this embodiment, the fastening nut 102 is hexagonal on the outside and is used to connect the constant volume reaction tube 101 and the gas guide head 103. The constant volume reaction tube 101 is pre-fitted with a locking screw 109, and the locking screw 109 and the fastening nut 102 are locked together by thread engagement.

[0080] In this embodiment, the sealing ring 104 is annular and is used for sealing between the two.

[0081] In this embodiment, the upper end of the capillary pressure transmission tube 105 is provided with an external thread, which facilitates threaded connection with the connecting nut 204 at one end of the pressure measurement transmission tube 2.

[0082] In this embodiment, the reinforcing layer 106 is welded to the outside of the capillary pressure conduction tube 105 to protect the capillary pressure conduction tube 105. The upper half of the reinforcing layer 106 is a heat sink 107 for heat dissipation of the capillary pressure conduction tube 105.

[0083] As a preferred embodiment of this invention, such as Figure 3As shown, a connecting hole 108 is radially formed on the sidewall of the reinforcing layer 106 between the heat sinks 107. In this embodiment, the connecting hole 108 is used to prevent the formation of a sealed structure between the reinforcing layer 106 and the capillary pressure conduction tube 105, which could lead to damage to the capillary pressure conduction tube 105 due to thermal expansion and contraction of the gas.

[0084] In this embodiment, the constant volume reaction tube 101, fastening nut 102, capillary pressure transmission tube 105, reinforcing layer 106 and heat sink 107 are made of stainless steel; the sealing ring 104 is made of fluororubber or soft aluminum.

[0085] Preferably, in this embodiment, the outer shell 4 is provided with a placement seat for placing the reactor 1, which is used to place the reactor 1 when the reactor 1 is not heated.

[0086] The reactor of this invention can ensure that there is sufficient space for dangerous samples such as explosives during the test process, and has good sealing performance, which can ensure that the gas released from the constant temperature decomposition of the sample is completely discharged to the pressure measurement module.

[0087] The internal volume of the reactor in this invention is determined by constant volume, ensuring that the test results are comparable to those of the traditional gas measurement method.

[0088] The reinforced structure and spiral heat dissipation structure of the reactor design of this invention can ensure gas conduction while reducing stress at the weld joints, extending the service life of the reactor, and improving the connection efficiency between the reactor and the pressure measurement module.

[0089] As one specific solution in this embodiment, such as Figure 4 As shown, the pressure measurement transmission tube 2 includes a hollow pressure transmission sleeve 201. One end of the pressure transmission sleeve 201 is connected to the pressure measuring head 202, and the other end of the pressure transmission sleeve 201 is connected to the connector 203. The connector 203 is fitted with a connecting nut 204.

[0090] like Figure 5 As shown, the lower end of the pressure measuring head 202 is provided with an external thread; the pressure measuring head 202 is connected to the measuring port of the pressure sensor 3 by a thread; the connecting nut 204 is connected to and sealed to the air outlet at the upper end of the reactor 1 by a thread. The pressure sensor 3 adopts a pressure sensor commonly known in the art.

[0091] In this embodiment, the pressure transmission sleeve 201 is a 316 stainless steel microporous metal tube with an outer diameter of 1.588 mm, a wall thickness of 0.508 mm, a length of 400.0 mm, and a volume of approximately 0.103 mL. Its pore size and volume are much smaller than the inner diameter of reactor 1, which is approximately 17 mm, and its volume is approximately 25 mL. Through laser precision welding, a pressure measuring head 202 is welded to one end of the pressure transmission sleeve 201, and a connector 203 is welded to the other end.

[0092] In this embodiment, a connecting pipe is provided outside the upper through hole of the pressure measuring head 202. The outer diameter and wall thickness are the same as those of the pressure transmission sleeve 201, and it is connected to the port of the pressure transmission sleeve 201 by welding.

[0093] In this embodiment, the connector 203 is a stainless steel cylinder with a through hole. The through hole is divided into upper and lower parts. The upper part of the through hole has the same diameter as the inner diameter of the pressure transmission sleeve 201, while the lower part has a slightly larger diameter. This allows it to fit tightly with the upper outlet of the reactor 1 and be sealed by the connecting nut 204. A connecting pipe is provided outside the through hole at the upper end of the cylinder. The inner and outer diameters of the pipe are the same as those of the pressure transmission sleeve 201, and the pipe is connected to the other end of the pressure transmission sleeve 201 by laser welding.

[0094] In this embodiment, the connecting nut 204 is a standard part. When welding the connector 203, the connecting nut 204 must first be fitted onto the outside of the pressure transmission sleeve 201. The connecting nut 204 is connected through the external thread of the gas outlet end of the reactor 1.

[0095] As a preferred embodiment of this invention, such as Figure 4 As shown, the pressure transmission ferrule 201 is covered with a protective sleeve 205, which is a polytetrafluoroethylene (PTFE) tube. In this embodiment, the protective sleeve 205 is used to protect the metal pressure transmission ferrule 201 from deformation and breakage under external force or bending. The inner diameter of the protective sleeve 205 is slightly larger than the outer diameter of the ferrule, approximately 2 mm, and the outer diameter is 4 mm. Its length is the same as that of the pressure transmission ferrule 201, which is 400 mm. When welding the pressure measuring head 202 and the connector 203, the PTFE protective sleeve 205 must first be fitted onto the pressure transmission ferrule 201.

[0096] As a preferred embodiment of this invention, such as Figure 4 As shown, a protective sleeve 206 is installed at the connection position between the pressure transmission sleeve 201 and the pressure probe 202, and at the connection position between the pressure transmission sleeve 201 and the connector 203. The protective sleeve 206 is a stainless steel metal tube.

[0097] In this embodiment, since the wall thickness of the microporous metal pressure transmission sleeve 201 is relatively thin, about 0.508 mm, and the welded part is relatively weak, a protective sleeve 206 is installed at each of the welded parts at both ends of the pressure transmission sleeve 201; the pressure measuring head 202 is a stainless steel external hexagonal threaded through-hole connector, and the inner diameter of its through hole is consistent with the inner diameter of the pressure transmission sleeve 201.

[0098] In this embodiment, the outer diameter of the sheath tube 206 is 10mm, and its inner diameter is the same as the outer diameter of the protective sleeve 205, which is 4mm. It is fixed to the welding parts at both ends of the pressure transmission sleeve tube 201 by four embedded screws 207 to protect the welding parts from external bending.

[0099] The pressure measurement transmission tube of the present invention has a slender microporous structure, is covered with a polytetrafluoroethylene protective sleeve, and is designed with heating and constant temperature control at its connection with the reactor. This effectively solves the problems of high temperature gas thermal diffusion affecting the measurement accuracy of high-precision pressure sensors, drastic fluctuations in ambient temperature affecting accurate gas pressure measurement, and phase transitions of explosive gas products affecting accurate pressure measurement, thereby improving the pressure measurement accuracy of the testing system.

[0100] The pressure measurement transmission tube of the present invention can accurately measure the pressure of high-temperature gas in the reactor of the test system to the room temperature environment outside the test system.

[0101] As a preferred embodiment, a temperature sensor is installed inside the furnace body 6; such as Figure 2 As shown, the stainless steel sleeve 12 is filled with a glass fiber outer insulation cylinder 10, and a glass fiber inner insulation cylinder 11 is installed inside the glass fiber outer insulation cylinder 10. The height of the glass fiber inner insulation cylinder 11 is less than the height of the glass fiber outer insulation cylinder 10. The furnace body 6 is located inside the glass fiber inner insulation cylinder 11. A top ceramic heat insulation plate 13 is installed on the top of the glass fiber inner insulation cylinder 11 for thermal insulation. The top opening of the movable insulation sleeve 9 extends out of the top ceramic heat insulation plate 13.

[0102] As a preferred embodiment, the furnace body 6 has a symmetrical cylindrical structure and is made of cast aluminum; there are eight pressure measurement and transmission pipes 2; there are eight reactor heating chambers 8, which are evenly distributed inside the furnace body 6.

[0103] As a preferred embodiment of this invention, such as Figure 6 and Figure 7 As shown, the movable insulation sleeve 9 includes a fixing base 901, the fixing base 901 includes an inner cylinder 90101, and the bottom of the inner cylinder 90101 is coaxially and integrally formed with an annular support base 90102. The inner cylinder 90101 and the annular support base 90102 are vertically arranged.

[0104] like Figure 7 As shown, the inner cylinder 90101 is fitted with an insulation sleeve 902, and the insulation sleeve 902 is fitted with a metal cover 903. The bottom ends of the insulation sleeve 902 and the metal cover 903 are both resting on the annular support base 90102.

[0105] like Figure 7As shown, the top of the inner cylinder 90101 is detachably fitted with an annular heat insulation cover 904. The central hole of the annular heat insulation cover 904, the central cavity of the inner cylinder 90101, and the central hole of the annular support base 90102 form a reactor through cavity 905 with both ends connected.

[0106] In this embodiment, the insulation sleeve 902 is made of gypsum material; the thickness of the insulation sleeve 902 is 21mm. For example... Figure 6 As shown, the metal cover 903 has a perforated mesh structure. The annular heat insulation cover 904 is made of ABS plastic material.

[0107] In this embodiment, the movable insulation sleeve 9 is assembled with the sealed reactor 1: the movable insulation sleeve 9 is inserted into the capillary pressure transmission tube 105 of the sealed reactor 1 from top to bottom, placed outside the capillary pressure transmission tube 105, and in contact with the upper part of the fastening nut 102. The fastening nut 102 also serves as a limiting device. After the movable insulation sleeve 9 is assembled, the upper end of the sealed reactor 1 can expose all the external threads, which are used for threaded connection between the capillary pressure transmission tube 105 of the sealed reactor 1 and the connecting nut 204 at one end of the pressure measuring transmission tube 2.

[0108] The movable insulation sleeve of this invention provides a dedicated movable insulation sleeve for the long-term storage stability testing system of explosives; the movable insulation sleeve proposes various designs to improve the insulation performance of different components, while taking into account the requirements of overall strength, sealing, and convenience, and has good insulation effect and practicality.

[0109] The advantages of the movable insulation sleeve of the long-term storage stability testing system for explosives proposed in this invention are: first, it matches well with the structure of a sealed reactor; second, it has a low heat transfer rate and good insulation effect; and third, it is movable, flexible, and easy to maintain.

[0110] As a preferred embodiment, the calibration and control subsystem of the long-term storage stability testing system for explosives adopts the calibration and control subsystem of the long-term storage stability testing system for explosives given in Embodiment 1. The calibration and control method of the long-term storage stability testing system for explosives adopts the calibration and control method of the long-term storage stability testing system for explosives given in Embodiment 2.

[0111] In the long-term storage stability test system for explosives of the present invention, the explosives are placed in the reactor 1 of the pressure measurement module during the test. The reactor 1 is heated to a given volume by the constant temperature heating module. The decomposition gas pressure value is transmitted to the remote pressure sensor 3 through the pressure measurement transmission tube 2. The temperature of the constant temperature heating module is controlled and the decomposition gas pressure value is recorded.

[0112] The long-term storage stability test method for explosives based on the long-term storage stability test system of the present invention is as follows: Figure 10As shown, the method includes the following steps: Step 1, Preparation of explosive samples: In step one, the explosive sample has the following requirements: First, larger-sized explosives are pulverized into particles that can pass through a 5.0mm sieve, while smaller particles that pass through a 0.2mm sieve are removed.

[0113] Second, for explosive samples that can pass through a 5.0mm sieve without requiring crushing, the original samples were tested.

[0114] Third, the solid explosive samples used in the experiment were not artificially dried to ensure that the experimental conditions were consistent with the actual long-term storage conditions.

[0115] Step 2, rapid screening test: Differential thermal analysis and differential scanning calorimetry were used to conduct rapid screening tests on the thermal decomposition of the explosive samples to determine the melting temperature, thermal decomposition initiation temperature and decomposition peak temperature of the samples; this provides a basis for setting long-term storage stability test conditions.

[0116] In this embodiment, differential thermal analysis and differential scanning calorimetry are employed using differential thermal analysis and differential scanning calorimetry known in the art.

[0117] Step 3, setting up experimental conditions: Based on the melting temperature, thermal decomposition initiation temperature, and decomposition peak temperature of the sample to be tested obtained in step two, the long-term storage stability test conditions are set according to the characteristics of the sample to be tested.

[0118] The characteristics of the samples to be tested include single-base gunpowder, double-base gunpowder, triple-base gunpowder, composite solid propellants, and explosives.

[0119] The long-term storage stability test conditions include the test temperature and the holding time.

[0120] In step three, the test temperature for single-base propellant is set to 125℃ and the holding time is set to 4.5h; the test temperature for double-base propellant, triple-base propellant, composite solid propellant, and explosive is set to 110℃ and the holding time is set to 6h.

[0121] Step 4, Sample loading: Accurately weigh 1g of the explosive sample prepared in step one, put it into reactor 1 of the long-term storage stability test system for explosives and seal it. Record the ambient temperature and humidity during the test filling. At the same test temperature, at least two parallel explosive samples need to be filled.

[0122] In step four, the error should not exceed 0.001g.

[0123] Step 5: High-temperature constant temperature test and pressure monitoring: Reactor 1, filled with explosive samples, is simultaneously placed in the reactor heating chamber 8 of a stability testing system that has been kept at a preset test temperature under the same test temperature for a constant temperature and heat preservation test. At the same time, the pressure measurement module of the stability testing system is used to dynamically monitor the gas pressure generated by the thermal decomposition of the sample and obtain the pressure-time curve.

[0124] In this embodiment, the pressure-time curve of a typical explosive sample at 110°C is shown below. Figure 11 As shown.

[0125] Step Six, Data Processing: Long-term storage stability test data are calculated according to P=P t -P1 formula processing: among the measurement data of at least two parallel explosive samples, the maximum value is taken as the measurement result; In the formula: P represents the gas pressure value generated by the decomposition of the explosive sample; P t This indicates the pressure value in reactor 1 when the explosive sample reaches the constant temperature holding time t (4.5h or 6h); P1 represents the pressure value in reactor 1 when the explosive sample is heated for 1 hour.

[0126] Step 7, Long-term storage stability evaluation: Using the stability threshold Pc as the evaluation criterion, when the gas pressure value P generated by the decomposition of the explosive sample is less than or equal to Pc, the long-term storage stability is qualified; otherwise, the long-term storage stability is unqualified.

[0127] The method of the present invention can evaluate the stability of solid explosives during storage and use, and solves the problems of lack of stability evaluation methods for solid explosives during storage and use, and large errors in the evaluation of long-term storage stability by existing methods.

[0128] This invention is based on real storage and use environment conditions. Under the condition of limited increase in storage environment temperature, it directly evaluates long-term storage stability by monitoring the gas pressure generated by the decomposition of explosives. The test conditions are more scientific and reasonable, which improves the accuracy of the test results. At the same time, the method is simple to operate, the test process is fully automated, and the requirements for experimental personnel are low.

Claims

1. A calibration and control method for a long-term storage stability testing system for explosives, characterized in that, The method includes the following steps: Step 1, Temperature Calibration: During temperature calibration, the default settings are a minimum temperature of 40℃, a maximum temperature of 160℃, and a total of 9 calibrations. After calibration begins, the furnace body is heated sequentially from low to high: 40℃, 55℃, 70℃, 85℃, 100℃, 115℃, 130℃, 145℃, and 160℃. The time-temperature curve of the furnace body is plotted in real time. The working state of the calibration and control subsystem is "waiting for constant temperature". Once the difference between the detection results of the test temperature sensor and the detection results of the calibration device temperature sensor stabilizes, the working state of the calibration and control subsystem is "system constant temperature". The calibration and measurement and control subsystem maintains a constant temperature at the current temperature point for 30 minutes, and takes the average data within 30 minutes as the furnace body temperature and calibration temperature at the current temperature point. The furnace body temperature and calibration temperature at the 9 temperature points are listed in a table. The calibration algorithm is used to calculate the temperature calibration coefficient. Based on the calibration results, the calibration coefficient is either discarded or issued. After the calibration coefficient is issued, subsequent tests are conducted to calibrate the measured temperature based on the calibration coefficient. Step 2, Pressure Calibration: Pressure calibration involves simultaneously calibrating eight sealed reactors within a single furnace. The default settings range from a minimum pressure of 5 kPa to a maximum pressure of 300 kPa, with 13 calibration points. After calibration begins, the pressure is increased sequentially from low to high: 5 kPa, 10 kPa, 20 kPa, 50 kPa, 100 kPa, 125 kPa, 150 kPa, 175 kPa, 200 kPa, 225 kPa, 250 kPa, 275 kPa, and 300 kPa. The pressure of the eight sealed reactors and the calibration pressure are monitored in real time. Once the difference between the test pressure and the calibration pressure stabilizes, the eight test and calibration pressures at the current pressure point are recorded. This process continues until all 13 pressure points have been tested. The calibration algorithm is then used to calculate the pressure calibration coefficient. Based on the calibration results, the calibration coefficient can be either discarded or issued. After the calibration coefficient is issued, subsequent tests calibrate the measured pressure according to the calibration coefficient. Step 3, Temperature Control and Pressure Measurement: First, select the furnace body to be tested. According to the test requirements, set up to 5 different temperature points and sample program heating control processes with different durations. Set the test duration and temperature, set the maximum safe temperature and maximum safe pressure, and set the pressure sampling interval. Then, start the long-term storage stability test of the explosives. Start recording and corresponding pressure-time curves of the furnace body temperature value and the pressure values ​​of 8 sealed reactors. After the test, the working status of the calibration and measurement and control subsystem is "test completed", and the test data is saved.

2. The calibration and control method for the long-term storage stability testing system of explosives as described in claim 1, wherein the method employs a calibration and control subsystem, characterized in that, The calibration and control subsystem includes a main control module, which is connected to a furnace temperature measurement module, a furnace temperature control module, a pressure measurement module, a calibration module, a communication module, and a status alarm module. The power supply module is connected to the main control module, the furnace temperature measurement module, the furnace temperature control module, the pressure measurement module, the calibration module, the communication module, and the status alarm module.

3. The calibration and control method for the long-term storage stability testing system of explosives as described in claim 2, characterized in that, The main control module is used to receive instructions from the host computer and simultaneously call various modules to perform control, measurement, and data processing. The furnace temperature measurement module is used to measure the furnace body temperature through a platinum resistance temperature sensor and to measure the furnace temperature using a resistance ratio temperature measurement method. The furnace temperature control module is used to control the heater through a segmented PID temperature control method, reduce temperature overshoot, shorten temperature stabilization time, and achieve rapid and long-term stable control of the furnace temperature. The pressure measurement module is used to measure the gas pressure inside the constant volume reaction vessel via a pressure sensor. The calibration module is used to perform temperature and pressure calibration. It uses the measured values ​​of a more accurate standard temperature sensor and the stable air pressure value output by the pressure controller as the standard for temperature and pressure, and compares and calibrates them with the measured values ​​of the calibration and measurement and control subsystem. The aforementioned communication module is used for communication between the host computer and the main control module, as well as between various modules. The aforementioned status alarm module is used to issue an alarm when the furnace body overheats to above 200°C, indicating a dangerous condition. The power module is used to supply power to each module and provide a reference voltage.

4. The calibration and control method for the long-term storage stability testing system of explosives as described in claim 1, characterized in that, The long-term storage stability test system for explosives includes a pressure measurement module, which includes at least one reactor (1) and at least one pressure measurement transmission tube (2). One end of each pressure measurement transmission tube (2) is connected to the air outlet at the upper end of the reactor (1), and the other end of each pressure measurement transmission tube (2) is connected to the measurement port of the pressure sensor (3). It also includes a constant temperature heating module, which includes a shell (4), a stainless steel sleeve (12) is fitted inside the shell (4), a furnace support plate (14) is provided at the bottom of the stainless steel sleeve (12), a furnace body (6) is installed on the furnace support plate (14) through a furnace body bracket (5), a heater (7) for heating the furnace body (6) is installed on the furnace support plate (14), at least one reactor heating chamber (8) is installed inside the furnace body (6), and a movable heat insulation sleeve (9) is coaxially provided on each reactor heating chamber (8), the top of the movable heat insulation sleeve (9) extends to the top of the shell (4); the reactor (1) can enter the reactor heating chamber (8) through the movable heat insulation sleeve (9) and be heated by the constant temperature heating module.

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