A non-contact pressure curing device and method for solid propellants

Abstract

This invention discloses a novel non-contact pressure curing device for solid propellants, belonging to the field of solid propellant technology. The invention includes a gas supply system, a curing system, and a data acquisition system. The gas supply system includes a nitrogen cylinder fixed to a cylinder rack, and a pressure reducing valve installed on the nitrogen cylinder to regulate the pressure inside. A metal hose A is connected to the pressure reducing valve, with its end away from the pressure reducing valve connected to the curing system, serving as the gas inlet for the curing system. A metal hose B is connected to metal hose A via a T-connector, and a hand valve is fixedly installed at the opening of metal hose B. A data transmission line is connected to the top of the curing system, with its end away from the curing system connected to a data acquisition instrument in the data acquisition system. This invention provides data support for studying the heat of reaction in propellant column curing. The device is simple in structure, practical, reliable, and highly safe.

Description

Technical Field

[0001] This invention relates to the field of solid propellant technology, specifically to a non-contact pressure curing device and method for solid propellants. Background Technology

[0002] As the fill ratio of solid rocket motors continues to increase, the thermal stress generated by the curing and cooling of the propellant grains after molding also increases, significantly affecting the structural safety and interfacial bonding performance of the engine. To reduce the increased thermal stress of the propellant grains caused by high fill ratios and improve the molding quality of the propellant grains and various bonding interfaces, a pressure-curing molding process is adopted for high-fill propellant grain molding. The basic process mainly includes: casting the propellant slurry; applying pressure to the propellant slurry to cause the composite material shell to expand and deform under internal pressure; after the slurry has cured at a constant temperature and pressure, the propellant grains are cooled and depressurized in a certain way; after the pressure is removed, the composite material shell rebounds and shrinks due to unloading, which can both offset some of the deformation caused by the shrinkage of the propellant grains due to curing and cooling, and also form a certain compressive preload at the bonding interfaces between the insulation layer, liner, and propellant grains to improve interfacial bonding performance. With the increasing demands for high fill ratios and structural safety in aerospace and military solid rocket motors, the improvement of solid propellant pressure-curing technology is particularly important.

[0003] During pressurized curing, high-pressure gas typically comes into direct contact with the propellant slurry through the inlet pipe. This not only increases the risk of accidents but also negatively impacts the structural integrity of the propellant grain. Furthermore, the synergy between temperature and pressure during pressurized curing is crucial for successfully completing the test and producing higher-performance propellant grains. Since curing is an exothermic process, the heat generated by the propellant slurry also affects its own curing process. Therefore, studying the self-generated heat of the propellant slurry is essential for achieving temperature-pressure synergy in pressurized curing. To improve the structural integrity of solid propellant grains, enhance the safety of pressurized curing tests, and meet the need to study the impact of the propellant slurry's self-generated heat on curing, it is necessary to design and manufacture a safe pressurized curing device and method that avoids direct contact between the propellant grain and high-pressure gas and allows for direct measurement of the grain's internal temperature.

[0004] Existing pressure curing devices typically pressurize the propellant by directly contacting it with high-pressure gas, and it is difficult to measure the temperature inside the propellant column. To solve the above problems, this invention proposes a non-contact pressure curing device and method for solid propellants. Summary of the Invention

[0005] The purpose of this invention is to provide a non-contact pressure curing device for solid propellants to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention improves upon traditional solid propellant pressurization and curing devices by using a pressure transmission block to non-contactly pressurize high-pressure gas and propellant slurry. Improvements to the pressurization tank cover and pressure transmission block enable real-time temperature measurement of the propellant column using thermocouples and real-time pressure monitoring within the chamber using pressure sensors. Furthermore, a simple, safe, and reliable experimental setup is constructed, and a non-contact pressurization and curing device and method for solid propellants are proposed. Specifically, the following contents are included:

[0008] A non-contact pressure curing device for solid propellants, characterized in that the device includes a gas supply system, a curing system, and a data acquisition system, wherein:

[0009] The gas supply system includes a metal hose, a hose connector, a nitrogen cylinder, and a pressure reducing valve. The nitrogen cylinder is fixed to a cylinder rack to prevent tipping and is connected to the pressure reducing valve via a thread. By adjusting the pressure reducing valve, the pressure inside the cylinder is reduced, allowing the required high-pressure gas to be supplied to the curing system. The metal hose A connects the nitrogen cylinder to the curing system via a threaded connection, serving as the gas inlet pipe for the curing system.

[0010] The curing system includes an insulation box, a pressure tank cover, an upper flange, a wire threading cap A, a sealing silicone A, a wire threading base A, a pressure tank cavity, a pressure transmission block, a cylinder body, a cylinder body bottom plate, a lower flange, a pressure sensor base, a wire threading cap B, a sealing silicone B, a wire threading base B, a handle, a slurry, and a pressure tank bottom plate. The pressure tank cover is connected to a metal hose A via a hose connector, allowing high-pressure nitrogen to enter the pressure tank smoothly and stably. The pressure tank cavity is bolted to the pressure tank cover via an upper flange and to the pressure tank bottom plate via a lower flange. The threading cap A and the threading base A are connected by threads and sealed with sealing silicone A. The pressure tank cover and sealing silicone A have small holes for the temperature thermocouple to pass through the pressure tank cover into the cavity. The threading cap B and the threading base B are connected by threads and sealed with sealing silicone B. The pressure transmission block and sealing silicone B have small holes for the temperature thermocouple to pass through the pressure transmission block to measure the internal temperature of the propellant column. The handle is used to more stably place the pressure transmission block. The pressure sensor base is used to connect the pressure sensor to achieve real-time pressure measurement.

[0011] The data acquisition system includes a pressure data transmission line, a temperature data transmission line, a pressure sensor, a temperature thermocouple, and a data acquisition instrument. The pressure sensor is connected to the pressure sensor base via a thread to measure the pressure inside the pressurization chamber in real time, and transmits the measurement data to the data acquisition instrument via the pressure data transmission line. The temperature thermocouple passes sequentially through sealing silicone B, the pressurization tank cover, sealing silicone A, and the fine hole left in the pressure transmission block to directly measure the temperature inside the slurry, and transmits the measurement data to the data acquisition instrument via the temperature data transmission line.

[0012] Preferably, a pressure-relieving plate is slidably installed above the inner wall of the pressure tank cavity, a sealing ring is installed on the outer surface of the pressure-relieving plate, a push rod is rotatably connected to the upper surface of the pressure-relieving plate, a multi-functional buffer block is rotatably connected to the end of the push rod away from the sealing ring, the multi-functional buffer block is slidably installed on the upper cover of the pressure tank on the side away from the push rod, a limit ring is fixedly installed on the lower surface of the multi-functional buffer block, a buffer spring is symmetrically fixedly installed on one side of the multi-functional buffer block, an arc-shaped clamp is fixedly installed on the other side of the multi-functional buffer block, and the end of the buffer spring away from the multi-functional buffer block is fixedly connected to the limit ring.

[0013] Preferably, to avoid direct contact between the slurry and high-pressure nitrogen, a pressure-curing test is conducted through a pressure transmission block, and the diameter of the pressure transmission block should match the inner diameter of the cylinder to prevent slurry leakage and excessively rapid descent of the pressure transmission block.

[0014] Preferably, the hose connector, wire clamp A, sealing silicone, wire base A, pressure sensor base, wire clamp B, sealing silicone B, and wire base B form a sealed structure. The hose connector ensures that high-pressure nitrogen enters the curing fixture. Wire clamp A, sealing silicone A, wire base A, wire clamp B, sealing silicone B, and wire base B ensure that the temperature thermocouple passes sequentially through the small holes left in the sealing silicone B, the pressure tank cover, the sealing silicone A, and the pressure transmission block. The diameter of the temperature thermocouple should match the four small holes to prevent leakage. The pressure sensor is threaded onto the pressure sensor base to monitor the gas pressure inside the curing fixture.

[0015] Preferably, the pressure transmission block has circumferential grooves at its midpoint height and on the upper part of the cylinder inner wall to accommodate the ignition rubber sealing ring. These grooves should match the diameter of the ignition rubber sealing ring to prevent air leakage and slow the descent speed of the pressure transmission block, allowing the slurry to be pressurized at an ultra-slow rate, which is more conducive to the smooth implementation of the pressure curing test. During the test, the pressure transmission block is simply and flexibly positioned against the cylinder body through the circumferential ignition rubber sealing ring at its midpoint height. When no pressure is applied, the bottom surface of the pressure transmission block is in contact with the upper surface of the slurry, preventing excessive dosage and the slurry from being squeezed by the pressure transmission block and the inner wall of the cylinder, thus preventing test accidents. During pressurization, the ignition rubber sealing ring can deform, allowing the pressure transmission block to undergo small displacements, thereby pressurizing the slurry.

[0016] Preferably, a groove is formed on the upper edge of the pressure vessel cavity and on the bottom plate of the pressure vessel to accommodate the ignition sealing ring. The groove should match the diameter of the ignition sealing ring, which not only improves the airtightness of the curing system but also prevents leakage during the experiment, thus improving the safety of the experiment.

[0017] Preferably, the temperature thermocouple passes sequentially through the sealing silicone B, the pressure tank cover, the sealing silicone A, and the fine holes left in the pressure transmission block to directly measure the temperature inside the drug column during the entire pressurization and curing process. The heat of the curing reaction is calculated by the temperature difference between the drug column and the set temperature of the insulation box.

[0018] A non-contact pressure curing device for solid propellants includes the following steps:

[0019] S1. Assemble the test apparatus. The pressure tank cavity is connected to the pressure tank cover via upper flange bolts, and to the pressure tank bottom plate via lower flange bolts. Check the airtightness.

[0020] S2. Gas source installation and securing. Install the nitrogen cylinder on the anti-tipping cylinder rack;

[0021] S3. Install and fix the inlet and outlet pipes, various sensors, and data transmission lines. Metal hose A connects the nitrogen cylinder to the curing system via a threaded connection, serving as the inlet pipe for the curing system. Metal hose B serves as the outlet pipe and is threadedly connected to metal hose A via a tee. The hand valve is fixed to the port of metal hose B via a threaded connection. The pressure sensor and its base are threaded together. The temperature thermocouple passes sequentially through sealing silicone B, the pressure tank cover, sealing silicone A, and the small hole left in the pressure transmission block. The measurement data is transmitted to the data acquisition instrument via pressure and temperature data transmission lines. Turn on the data acquisition instrument and perform initial signal checks.

[0022] S4. Vacuum casting method is used to pour the slurry into the cylinder and then the device is sealed.

[0023] S5. Turn on the nitrogen cylinder to supply gas and adjust the working status of the pressure reducing valve;

[0024] S6. Conduct a pressure curing test and collect temperature and pressure data in real time;

[0025] S7. After the test, close the pressure reducing valve and open the hand valve to discharge gas from the metal hose B. The hand valve is equipped with a Venturi tube to limit the flow and achieve slow-rate safe venting. Beneficial effects

[0026] (1) Simple structure and safe and reliable: The test device of the present invention has only a dozen main components, which are closely matched and tightly connected, and the overall device works reliably and is highly safe;

[0027] (2) Modular components: The main components of the test device of the present invention can be easily disassembled, especially the pressure transmission block and the cylinder can be disassembled to easily remove the residual drug or residue inside so as to carry out the next test as soon as possible;

[0028] (3) Multiple data can be measured: The device is equipped with temperature thermocouples and pressure sensors to measure the temperature and pressure rise, heat preservation and pressure holding and temperature and pressure drop in real time throughout the entire process of pressure curing;

[0029] (4) Quantification of curing reaction heat: The internal temperature of the slurry is measured and the difference is calculated with the temperature set in the heat preservation box. The heat released by the curing reaction of the slurry can be quantitatively calculated using the curing reaction heat formula.

[0030] (5) Temperature and pressure co-visualization: Through real-time measurement by temperature thermocouples and pressure sensors, the processes of heating and pressurizing, heat preservation and pressure preservation, and cooling and pressurizing during the experiment are clearly visible on the data acquisition instrument. Attached Figure Description

[0031] Figure 1 This is a schematic cross-sectional view (front view) of the main structure of a non-contact pressure curing device for solid propellants according to the present invention.

[0032] Figure 2 This is a schematic diagram of the macroscopic layout of a non-contact pressure curing device for solid propellants according to the present invention;

[0033] Figure 3 This is a partial structural decomposition diagram of the main structure of the present invention;

[0034] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0035] Figure 5 The curing temperature and pressure curves are obtained by the data acquisition instrument mentioned in Embodiment 1 of the present invention.

[0036] In the diagram: 1. Metal flexible hose A; 2. Insulation box; 3. Flexible hose connector; 4. Pressure tank cover; 5. Upper flange; 6. Wiring cap A; 7. Sealing silicone sealant A; 8. Wiring base A; 9. Pressure tank cavity; 10. Pressure transmission block; 11. Cylinder body; 12. Cylinder body base plate; 13. Lower flange; 14. Pressure data transmission line; 15. Temperature data transmission line; 16. Pressure sensor; 17. Pressure sensor base; 18. Wiring 19. Pressure cap B; 20. Sealing silicone B; 21. Threading base B; 22. Handle; 23. Temperature thermocouple; 24. Medicine syrup; 25. Pressure tank bottom plate; 26. Nitrogen cylinder; 27. Pressure reducing valve; 28. Data acquisition instrument; 29. ​​Hand valve; 40. Metal hose B; 41. Pressure relief plate; 42. Sealing ring; 43. Push rod; 44. Multi-functional buffer block; 45. Buffer spring; 46. Arc-shaped clamp; 47. Limiting post; 48. Limiting ring. Detailed Implementation

[0037] 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.

[0038] Example 1: Please refer to Figure 1-5 This invention proposes a non-contact pressure curing device for solid propellants, comprising a gas supply system, a curing system, and a data acquisition system;

[0039] The gas supply system includes a metal hose A1, a hose connector 3, a nitrogen cylinder 25, a pressure reducing valve 26, a manual valve 28, and a metal hose B 29. The nitrogen cylinder 25 is fixed to a cylinder rack to prevent tipping and is threadedly connected to the pressure reducing valve 26. Adjusting the pressure reducing valve 26 lowers the pressure inside the cylinder, allowing the required high-pressure gas to flow to the curing system. The metal hose A1 connects the nitrogen cylinder 25 to the curing system via a threaded connection, serving as the inlet pipe for the curing system. The metal hose B 29 is threadedly connected to the metal hose A1 via a tee, and the manual valve 28 is fixed to the port of the metal hose B 29 via the threaded connection.

[0040] The curing system includes an insulation box 2, a pressure tank cover 4, an upper flange 5, a wire threading cap A 6, a sealing silicone A 7, a wire threading base A 8, a pressure tank cavity 9, a pressure transmission block 10, a cylinder body 11, a cylinder body base plate 12, a lower flange 13, a pressure sensor base 17, a wire threading cap B 18, a sealing silicone B 19, a wire threading base B 20, a handle 21, a slurry 23, and a pressure tank bottom plate 24. The pressure tank cover 4 is connected to a metal hose A 1 via a hose connector 3, allowing high-pressure nitrogen to smoothly and stably enter the pressure tank. The pressure tank cavity 9 is bolted to the pressure tank cover 4 via the upper flange 5 and to the pressure tank bottom plate 24 via the lower flange 13. The wire threading cap A 6 is threaded to the wire threading base A 8 and sealed with sealing silicone A 7. The pressure tank cover 4 is connected to the sealing silicone A 7 via a threaded connection. The pressure transmission block 10 has a small hole for the temperature thermocouple 22 to pass through the pressure tank cover 4 and enter the cavity; the threading cap B18 and the threading base B20 are connected by threads and sealed with sealing silicone B19; the pressure transmission block 10 and the sealing silicone B19 have small holes for the temperature thermocouple 22 to pass through the pressure transmission block 10 to measure the internal temperature of the drug column; the handle 21 is used to place the pressure transmission block 10 more stably; the pressure sensor base 17 is used to connect the pressure sensor 16 to realize real-time pressure measurement;

[0041] The data acquisition system includes a pressure data transmission line 14, a temperature data transmission line 15, a pressure sensor 16, a temperature thermocouple 22, and a data acquisition instrument 27. The pressure sensor 16 is connected to the pressure sensor base 17 by a thread to measure the pressure in the pressurization chamber in real time, and transmits the measurement data to the data acquisition instrument 27 through the pressure data transmission line 14. The temperature thermocouple 22 passes through the fine holes left by the sealing silicone B 19, the pressurization tank cover 4, the sealing silicone A 7, and the pressure transmission block 10 to directly measure the temperature inside the slurry 23, and transmits the measurement data to the data acquisition instrument 27 through the temperature data transmission line 15.

[0042] To avoid direct contact with high-pressure nitrogen, the slurry 23 is subjected to a pressure curing test through the pressure transmission block 10. The diameter of the pressure transmission block 10 should match the inner diameter of the cylinder 11 to prevent leakage of the slurry 23 and excessively rapid descent of the pressure transmission block 10.

[0043] The hose connector 3, wire threading cap A 6, sealing silicone A 7, wire threading base A 8, pressure sensor base 17, wire threading cap B 18, sealing silicone B 19, and wire threading base B 20 form a sealed structure. The hose connector 3 ensures that high-pressure nitrogen enters the curing fixture. The wire threading cap A 6, sealing silicone A 7, wire threading base A 8, wire threading cap B 18, sealing silicone B 19, and wire threading base B 20 ensure that the temperature thermocouple 22 passes sequentially through the small holes left by the sealing silicone B 19, the pressure tank cover 4, the sealing silicone A 7, and the pressure transmission block 10. The diameter of the temperature thermocouple 22 should match the four small holes to prevent air leakage. The pressure sensor 16 is threaded onto the pressure sensor base 17 to monitor the air pressure inside the curing fixture.

[0044] The pressure transmission block 10 has circumferential grooves at its mid-height position and on the upper part of the inner wall of the cylinder 11, used to accommodate the ignition rubber sealing ring. These grooves should match the diameter of the ignition rubber sealing ring to prevent air leakage and slow down the descent speed of the pressure transmission block 10, allowing the slurry 23 to be pressurized at an ultra-slow rate, which is more conducive to the smooth implementation of the pressure curing test. During the test, the pressure transmission block 10 is simply and flexibly positioned against the cylinder 11 by the circumferential ignition rubber sealing ring at its mid-height position. When no pressure is applied, the bottom surface of the pressure transmission block 10 is in contact with the upper surface of the slurry 23, preventing excessive dosage and the slurry 23 from being squeezed by the pressure transmission block 10 and the inner wall of the cylinder 11, thus preventing test accidents. When pressurized, the ignition rubber sealing ring can deform, allowing the pressure transmission block 10 to undergo small displacements, thereby pressurizing the slurry 23.

[0045] The upper edge of the pressure tank cavity 9 and the bottom plate 24 of the pressure tank each have a groove for placing the ignition sealing ring. The groove should match the diameter of the ignition sealing ring, which not only improves the airtightness of the curing system, but also prevents leakage during the experiment and improves the safety of the experiment.

[0046] The temperature thermocouple 22 passes through the fine holes left by the sealing silicone B 19, the pressure tank cover 4, the sealing silicone A 7, and the pressure transmission block 10 in sequence to directly measure the temperature inside the drug column during the entire pressure curing process. The heat of curing reaction is calculated by the temperature difference between the drug column and the set temperature of the heat preservation box 2.

[0047] This invention discloses a non-contact pressure curing device for solid propellants: an assembly and testing device. The pressure tank cavity 9 is bolted to the pressure tank cover 4 via an upper flange 5, and bolted to the pressure tank bottom plate 24 via a lower flange 13, for checking air tightness; and for installing and fixing the air source.

[0048] A pressure-relieving plate 41 is slidably installed on the upper part of the inner wall of the pressure tank cavity 9. A sealing ring 42 is installed on the outer surface of the pressure-relieving plate 41. A push rod 43 is rotatably connected to the upper surface of the pressure-relieving plate 41. A multi-functional buffer block 44 is rotatably connected to the end of the push rod 43 away from the sealing ring 42. The multi-functional buffer block 44 is slidably installed on the upper cover 4 of the pressure tank on the side away from the push rod 43. A limit ring 48 is fixedly installed on the lower surface of the multi-functional buffer block 44. A buffer spring 45 is symmetrically fixedly installed on one side of the multi-functional buffer block 44. An arc-shaped clamp 46 is fixedly installed on the other side of the multi-functional buffer block 44. The end of the buffer spring 45 away from the multi-functional buffer block 44 is fixedly connected to the limit ring 48.

[0049] Among them, the sealing ring 42 is made of corrosion-resistant and high-pressure-resistant material, while the arc-shaped clamp 46 is made of a material with certain toughness and corrosion resistance.

[0050] This solution, by setting a pressure buffer plate 41 on the inner wall above the pressure tank cavity 9, can reduce the pressure fluctuations that may occur in the pressure chamber during the material pressure curing process due to external factors such as power fluctuations, improper operation, or internal factors such as uneven material distribution and exothermic reaction. At this time, the pressure buffer device can absorb and buffer these pressure fluctuations, maintain the stability of the pressure in the chamber, and thus ensure the smooth progress of the curing process.

[0051] Furthermore, during pressurization or depressurization, the pressure relief plate 41 can slide within the pressurization tank cavity 9 to slow down the rate of pressure change, reduce the mechanical impact on the pressurization chamber wall and internal workpieces, and improve the overall stability of the equipment. By converting the vertical pressure into pressure on the limiting column 47, the mechanical impact on the inner wall of the device can be reduced, thereby reducing high-pressure deformation damage to the equipment.

[0052] It should be noted that the buffer spring 45 in this solution is replaceable, and buffer springs 45 with different elastic potential energies can be replaced according to the pressure curing standard.

[0053] Install nitrogen cylinder 25 on the anti-tipping cylinder rack; install and fix the inlet and outlet pipes, various sensors and data transmission lines; connect nitrogen cylinder 25 to the curing system via threaded connection using metal hose A 1 as the inlet pipe of the curing system; connect metal hose B 29 via threaded connection using metal hose A 1 as the outlet pipe; fix hand valve 28 to the port of metal hose B 29 via threaded connection. Pressure sensor 16 and pressure sensor base 17 are connected by threads. Temperature thermocouple 22 passes sequentially through the sealing silicone B 19, the pressure tank cover 4, the sealing silicone A 7, and the fine holes left in the pressure transmission block 10. The measurement data is transmitted to the data acquisition instrument 27 through the pressure data transmission line 14 and the temperature data transmission line 15. The data acquisition instrument 27 is turned on and a preliminary signal check is performed. The slurry 23 is poured into the cylinder 11 using a vacuum casting method and the device is sealed. The nitrogen cylinder 25 is turned on to supply gas, and the working state of the pressure reducing valve 26 is adjusted. A pressure curing test is performed, and temperature and pressure data are collected in real time. After the test, the pressure reducing valve 26 is closed, and the hand valve 28 is opened to discharge gas from the metal hose B 29. The hand valve 28 is equipped with a Venturi tube for flow restriction to achieve slow-rate safe venting.

[0054] Design a pressure curing test for a certain NEPE solid propellant, such as Figure 3 The figure shows the curing temperature and pressure curves measured by the data acquisition instrument 27 during the experiment. The experiment lasted for 7 days. Initially, the pressure was increased for 3 hours at a rate of 0.002 MPa / min, and maintained at a constant pressure of 5 MPa. At the end of the experiment, the pressure was released for 3 hours at a rate of 0.002 MPa / min. The monitored temperature of the drug column increased from room temperature (25℃) to 58℃ at an average rate of 2.4℃ / h during the initial curing stage, and was maintained at 58℃ until the device was depressurized and the experiment ended. The cured drug column obtained in the experiment was uniform and bubble-free, with high drug density. There was minimal leakage of drug slurry from gaps during the disassembly of the device components, resulting in good demolding performance. The experiment was safe, and the measurement results met expectations.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A non-contact pressure curing device for solid propellants, characterized in that, The device includes a gas supply system, a curing system, and a data acquisition system, wherein: The gas supply system includes a nitrogen cylinder (25), which is fixed on a gas cylinder rack. A pressure reducing valve (26) is installed on the nitrogen cylinder (25) to regulate the pressure inside the nitrogen cylinder (25). A metal hose A (1) is connected to the pressure reducing valve (26). The end of the metal hose A (1) away from the pressure reducing valve (26) is connected to the curing system, which serves as the gas inlet pipe of the curing system. A metal hose B (29) is connected to the metal hose A (1) through a three-way pipe. A hand valve (28) is fixedly installed at the opening of the metal hose B (29). The top of the curing system is connected to a data transmission line, and the end of the data transmission line away from the curing system is connected to the data acquisition instrument (27) of the data acquisition system; The curing system includes an insulation box (2), with a pressure tank bottom plate (24) at the bottom of the insulation box (2). A pressure tank cavity (9) is placed on the pressure tank bottom plate (24), and the bottom of the pressure tank cavity (9) is fixed to the pressure tank bottom plate (24) by a lower flange (13). A pressure tank top cover (4) is provided above the pressure tank cavity (9), and the pressure tank top cover (4) is fixed to the top of the pressure tank cavity (9) by an upper flange (5). A hose connector (3) and a pressure sensor base (17) are installed on the pressure tank top cover (4). The end of the metal hose A (1) away from the nitrogen cylinder (25) is fixedly connected to the hose connector (3). A pressure sensor (16) is installed on the pressure sensor base (17), and a pressure data transmission line is connected to the pressure sensor (16). (14); A pressure relief plate (41) is slidably installed on the upper part of the inner wall of the pressure tank cavity (9). A sealing ring (42) is installed on the outer surface of the pressure relief plate (41). A push rod (43) is circumferentially and uniformly connected to the upper surface of the pressure relief plate (41). A multi-functional buffer block (44) is slidably connected to the end of the push rod (43) away from the sealing ring (42). The multi-functional buffer block (44) is slidably installed on the upper cover (4) of the pressure tank on the side away from the push rod (43). A limit ring (48) is fixedly installed on the lower surface of the multi-functional buffer block (44). A buffer spring (45) is symmetrically fixedly installed on one side of the multi-functional buffer block (44). An arc-shaped clamp (46) is fixedly installed on the other side of the multi-functional buffer block (44). The end of the buffer spring (45) away from the multi-functional buffer block (44) is fixedly connected to the limit ring (48). The curing system also includes a cylinder (11), which is located inside the pressure tank cavity (9). The cylinder (11) contains a slurry (23). A pressure transmission block (10) is located above the cylinder (11), and a handle (21) is fixedly connected to the top of the pressure transmission block (10). A threading base A (8) is located at the center of the top surface of the pressure transmission block (10). A threading cap A (6) is connected to the threading base A (8), and a sealing silicone gel A (7) is provided between the threading cap A (6) and the threading base A (8). The center of the top surface of the pressure tank cover (4) is located at... A threading base B (20) is provided at the location, and a threading cap B (18) is connected to the threading base B (20). A sealing silicone B (19) is provided between the threading cap B (18) and the threading base B (20). The pressure transmission block (10), the threading base A (8), the threading cap A (6), the sealing silicone A (7), the pressure tank cover (4), the threading base B (20), the threading cap B (18), and the sealing silicone B (19) are all provided with fine holes. A temperature thermocouple (22) is installed through the fine hole. A temperature data transmission line (15) is connected to the top of the temperature thermocouple (22). The data acquisition system includes a pressure data transmission line (14), a temperature data transmission line (15), a pressure sensor (16), a temperature thermocouple (22), and a data acquisition instrument (27). The pressure sensor (16) is connected to the data acquisition instrument (27) through the pressure data transmission line (14), and the temperature thermocouple (22) is connected to the data acquisition instrument (27) through the temperature data transmission line (15). The bottom end of the temperature thermocouple (22) is inserted into the slurry (23) to directly measure the temperature inside the slurry (23).

2. The non-contact pressure curing device for solid propellants as described in claim 1, characterized in that, A pressure-curing test is conducted by setting a pressure transmission block (10) to avoid direct contact between the slurry (23) and high-pressure nitrogen; the diameter of the pressure transmission block (10) is matched with the inner diameter of the cylinder (11) to prevent leakage of the slurry (23) and control the descent speed of the pressure transmission block (10).

3. The non-contact pressure curing device for solid propellants as described in claim 1, characterized in that, The inner diameter of the fine hole matches the diameter of the temperature thermocouple (22) to avoid air leakage; the pressure sensor (16) is used to monitor the air pressure inside the heat preservation box (2); the pressure transmission block (10) has circumferential grooves A at the middle height position and the upper part of the inner wall of the cylinder (11) to place the ignition rubber sealing ring; the grooves A match the diameter of the ignition rubber sealing ring to prevent air leakage and control the descent speed of the pressure transmission block.

4. The non-contact pressure curing device for solid propellants as described in claim 1, characterized in that, The upper edge of the pressure tank cavity (9) and the bottom plate (24) of the pressure tank each have a groove B for placing the ignition sealing ring. The groove B is matched with the diameter of the ignition sealing ring.

5. The non-contact pressure curing device for solid propellants as described in claim 1, characterized in that, The temperature thermocouple (22) passes through the fine holes left by the sealing silicone B (19), the pressure tank cover (4), the sealing silicone A (7), and the pressure transmission block (10) in sequence. It is used to directly measure the temperature inside the drug column during the entire process of pressure curing, and to calculate the heat of curing reaction by setting the temperature difference between the drug column temperature and the temperature of the heat preservation box (2).

6. A non-contact pressure curing method for solid propellants implemented using the apparatus described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Assembly test device: Connect the pressure tank cavity (9) to the pressure tank cover (4) with the upper flange (5) and the pressure tank bottom plate (24) with the lower flange (13) to check the air tightness; S2. Gas source installation and fixing: Install the nitrogen cylinder (25) on the anti-tipping cylinder rack; S3. Installation and fixing of gas supply pipeline, various sensors and data transmission lines: Connect the metal hose A (1) to the nitrogen cylinder (25) and the curing system through the thread to serve as the gas supply pipeline of the curing system; connect the pressure sensor (16) and the pressure sensor base (17) through the thread; the temperature thermocouple (22) passes through the small hole left by the sealing silicone B (19), the pressure tank cover (4), the sealing silicone A (7), and the pressure transmission block (10) in sequence; transmit the measurement data to the data acquisition instrument (27) through the pressure data transmission line (14) and the temperature data transmission line (15); turn on the data acquisition instrument (27) and perform initial signal detection; S4. The slurry (23) is poured into the cylinder (11) using a vacuum casting method and the device is sealed. S5. Open the nitrogen cylinder (25) to supply gas and adjust the working status of the pressure reducing valve (26); S6. Conduct a pressure curing test and collect temperature and pressure data in real time; S7. After the test is completed, close the pressure reducing valve (26), open the hand valve (28), and discharge the gas through the metal hose B (29). The hand valve (28) is equipped with a Venturi tube for flow restriction to achieve slow-speed safe exhaust.

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