Device and method for measuring deformation quantity of grain in pressurizing and curing process of solid propellant

Abstract

The invention discloses a device for measuring the deformation quantity of a grain in the pressurizing and curing process of a solid propellant, and belongs to the technical field of aerospace power. A set of measuring device capable of directly measuring the deformation quantity in the grain pressurizing process is established, randomly distributed speckles can be sprayed on the upper surface of a film through a digital image correlation technology (DIC technology), a miniature high-speed camera is used for recording images before and after film deformation, speckle information can be displayed in a gray level mode, and the deformation quantity of the grain can be directly measured. Matching of feature points on the deformation picture is completed by using a specific search method and a related function, and finally deformation measurement of the grain is completed according to the obtained corresponding strain value and position value; besides, temperature and pressure data can be measured through a pressure sensor and a temperature thermocouple which are arranged in the device, data support is provided for studying grain volume change in simulation of the solid engine charging pressurization curing process, and the device is simple in structure, practical, reliable and high in safety.

Description

Technical Field

[0001] The present invention relates to the field of aerospace propulsion technology, and in particular to a device and method for measuring the shape variable of a solid propellant during pressurized curing. Background Art

[0002] As the loading ratio of solid propellant rockets continues to increase, the thermal stress generated by the curing and cooling of the engine grain after formation also increases, significantly affecting the structural safety and interfacial bonding performance of the engine. To reduce the increased thermal stress in the grain caused by high loading and improve the molding quality of the grain interior and various bonding interfaces, a pressurized curing molding process is being used to mold high-loading grains. The basic process involves pouring the propellant slurry; then applying a certain pressure to the propellant slurry, causing the composite shell to expand and deform under the action of internal pressure; after the slurry solidifies at a constant temperature and pressure, the grain is cooled and depressurized in some way; after the pressure is released, the composite shell rebounds and shrinks due to unloading, which not only offsets some of the deformation caused by the curing and cooling shrinkage of the grain, but also creates a certain compressive preload at the bonding interface between the insulation layer, liner, and the grain, improving interfacial bonding performance. With the increasing demand for high loading ratios and structural safety of solid propellants in the aerospace and military sectors, improving the pressurized curing process technology for solid propellants is particularly important.

[0003] Usually during the pressurized curing process, high-pressure gas comes into direct contact with the slurry through the air inlet pipe, which not only increases the risk of accidents, but also has a certain negative impact on the structural integrity of the grain. In addition, the coordination of temperature and pressure during the pressurized curing process is particularly important for the successful completion of the pressurized curing test and the production of higher-performance grains. At the same time, the curing reaction is an exothermic process. During the curing process of the slurry, the heat generated by the slurry also has a certain impact on its own curing. Therefore, studying the heat generated by the slurry itself is crucial to realizing the temperature-pressure synergy technology in the pressurized curing process. In order to improve the structural integrity of solid propellant grains, improve the safety of pressurized curing tests, and meet the needs of studying the impact of the slurry's own heat generation on curing, it is necessary to design and manufacture a safe pressurized curing device and method that can avoid direct contact between the grain and high-pressure gas and can directly measure the temperature inside the grain.

[0004] Existing pressurized solidification devices generally pressurize the grain by directly contacting high-pressure gas with the slurry, and it is difficult to measure the deformation of the grain during the pressurized solidification process. In order to improve the structural integrity of the solid propellant grain, improve the safety of the pressurized solidification test, and meet the needs of studying the deformation of the grain during the pressurized solidification process, it is necessary to design and manufacture a measurement device and method that can avoid direct contact between the grain and the high-pressure gas while directly measuring the deformation of the grain during the pressurized solidification process. Summary of the Invention

[0005] 1. Technical Problems to be Solved by the Present Invention

[0006] The object of the present invention is to provide a device for measuring the shape variable of a solid propellant pellet during pressurized curing to solve the problems mentioned in the background art.

[0007] 2. Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention improves the traditional solid propellant pressurization and curing measurement device, non-contact pressurization of high-pressure gas and slurry through a thin film; real-time measurement of the temperature inside the device cavity is performed using a temperature thermocouple, and real-time detection of the pressure inside the cavity is performed using a pressure sensor; digital image correlation technology (DIC technology) is used to record images of the film before and after deformation using a micro high-speed camera, ultimately achieving measurement of the deformation variable of the grain during pressurization and curing. Furthermore, a simple, safe and reliable experimental device is constructed, and a device and method for measuring the shape variable of the grain during pressurization and curing of solid propellants are proposed. Specifically, the method includes the following contents:

[0010] A device for measuring the shape variables of a solid propellant during pressurized curing process includes an air supply system, a curing system, and a data acquisition system, wherein:

[0011] The gas supply system includes a metal hose A, a hose connector, an air guide, a high-pressure nitrogen cylinder, a pressure-reducing valve, a metal hose B, and a hand valve. The high-pressure nitrogen cylinder is secured to a cylinder stand to prevent tipping and is threadedly connected to the pressure-reducing valve. Adjusting the pressure-reducing valve reduces the pressure within the cylinder, allowing the required high-pressure gas to flow to the curing system. The metal hose, threadedly connected to the high-pressure nitrogen cylinder and the curing system, serves as the curing system's air intake. Metal hose B is threadedly connected to metal hose A via a tee, and the hand valve is also threadedly secured to the nozzle of metal hose B.

[0012] The curing system includes an insulation box, a pressurized tank cover, an upper flange, a pressurized tank cavity, a cylinder flange, a cylinder body, a cylinder bottom plate, a lower flange, a pressure sensor base, a wire threading cap, a sealing silicone, a wire threading base, a film, a slurry, and a pressurized tank bottom plate; the pressurized tank cover is connected to the metal hose A through a hose connector, so that high-pressure nitrogen can enter the pressurized tank smoothly and steadily; the pressurized tank cavity is connected to the pressurized tank through an upper flange bolt, and is connected to the pressurized tank bottom plate through a lower flange bolt; the cylinder body is connected to the cylinder flange and the cylinder bottom plate through bolts; the wire threading cap is connected to the wire threading base through threads and sealed with sealing silicone. Fine holes are left on the pressurized tank cover and the sealing silicone for the temperature thermocouple to pass through the pressurized tank cover and enter the cavity; the pressure sensor base is used to connect the pressure sensor to realize real-time measurement of pressure; the film is fixed between the lower surface of the cylinder flange and the upper surface of the cylinder body through the cylinder flange.

[0013] The data acquisition system includes a pressure data transmission line, a temperature data transmission line, a pressure sensor, a micro camera, a temperature thermocouple, and a data acquisition instrument; the pressure sensor is connected to the pressure sensor base through a threaded connection to measure the pressure in the pressurized cavity in real time, and the measured data is transmitted to the data acquisition instrument through the pressure data transmission line; the temperature thermocouple passes through the threading cap, the sealing silicone, the threading base, and the fine holes left on the upper cover of the pressurized tank to measure the temperature in the pressurized tank cavity, and transmits the measured data to the data acquisition instrument through the temperature data transmission line; the micro camera is fixed under the upper cover through a threaded connection, and the head is aimed at the film to realize real-time photography of the film deformation.

[0014] Preferably, the upper cover and the upper flange of the pressurized tank are both provided with positioning grooves, a cross-shaped sealing gasket is installed in the positioning groove, an annular sealing ring is fixedly installed on the outer side of the cross-shaped sealing gasket, a secondary sealing gasket is sleeved on the outer side of the cross-shaped sealing gasket, and the secondary sealing gasket is installed between the upper cover and the upper flange of the pressurized tank;

[0015] Preferably, bolt holes are evenly provided on the upper cover and upper flange of the pressurized tank, and a pressure groove is provided on the upper side of the bolt hole, a pressure ring is slidably installed in the pressure groove, a pressure plate is provided on the circumference below the pressure ring, an arc-shaped extrusion surface is provided on the side of the pressure plate close to the pressure ring, and an arc-shaped extrusion surface is also provided below the pressure ring, and the pressure plate is slidably installed in the bolt hole for uniform extrusion of the sealing gasket by the bolt.

[0016] Preferably, the film is made of butyl rubber, which has high elasticity and high toughness properties, so as to prevent the deformation of the drug column from being too large during the pressurized curing process of the drug column, causing the film to expand and break, resulting in dangerous situations such as drug leakage.

[0017] Preferably, the cylinder body should be tightly connected to the cylinder flange and the cylinder bottom plate to prevent drug leakage, which may cause the slurry to enter between the cylinder flange and the upper surface of the cylinder body, squeezing the slurry and causing unnecessary danger; the pressurized tank cavity should be tightly connected to the pressurized tank cover and the pressurized tank bottom plate to prevent air leakage.

[0018] Preferably, the head of the micro camera should be aimed at the film to achieve real-time photography of the entire surface of the film, and the head should be lower than the front end of the temperature thermocouple to prevent the temperature thermocouple from blocking the camera; the fixed position of the entire micro camera should be as far away from the air guide cylinder as possible to avoid interference or even damage to the micro camera by high-pressure gas during air intake and exhaust.

[0019] Preferably, the slurry is prevented from directly contacting with high-pressure nitrogen by the thin film, thereby reducing the danger of the pressurized curing experiment.

[0020] Preferably, the cylinder body should be tightly connected to the cylinder flange and the cylinder bottom plate to prevent drug leakage, which may cause the slurry to enter between the cylinder flange and the upper surface of the cylinder body, squeezing the slurry and causing unnecessary danger; the pressurized tank cavity should be tightly connected to the pressurized tank cover and the pressurized tank bottom plate to prevent air leakage.

[0021] A method for measuring the shape variables of a solid propellant column during pressurized curing, comprising the following steps:

[0022] S1. Assemble the test device: Connect the pressure tank cavity to the pressure tank cover through the upper flange bolts, and connect it to the pressure tank bottom plate through the lower flange bolts, and check the airtightness;

[0023] S2. Install and secure the gas source. Install the high-pressure nitrogen cylinder on the anti-dumping cylinder stand;

[0024] S3. Install and secure the gas supply pipeline, various sensors, and data transmission lines: Connect the high-pressure nitrogen cylinder to the curing system through a threaded connection with metal hose A, which serves as the gas supply pipeline for the curing system. Thread the pressure sensor to the pressure sensor base. Pass the temperature thermocouple through the threading cap, sealing silicone, threading base, and small holes in the upper cover of the pressurized tank. Transmit the measured data to the data acquisition instrument through the pressure data transmission line and the temperature data transmission line. Turn on the data acquisition instrument and perform an initial signal inspection.

[0025] S4. Pour the slurry into the cylinder using a vacuum pouring method and seal the device;

[0026] S5. Open the high-pressure nitrogen cylinder and adjust the working state of the pressure reducing valve;

[0027] S6. Perform a pressurized curing test and collect data in real time;

[0028] S7. When the test is finished, close the pressure reducing valve, open the hand valve, and discharge the gas from the metal hose B.

[0029] 3. Beneficial effects

[0030] (1) Simple structure, safe and reliable: The test device of the present invention has only a dozen main parts, which are closely matched with each other and tightly connected. The whole device works reliably and is highly safe.

[0031] (2) Component modularity: The main components of the test device of the present invention can be easily disassembled, especially the membrane and the cylinder body, which can be disassembled to facilitate timely replacement of the membrane and removal of residual medicine or residue inside the cylinder body so that the next test can be carried out as soon as possible;

[0032] (3) Ability to measure a variety of data: The present invention installs a micro camera, a temperature thermocouple, and a pressure sensor in the device to measure the shape variables of the pellet during the entire pressurized curing process, the temperature and pressure rise, temperature and pressure maintenance, and temperature and pressure drop in the device in real time;

[0033] (4) Reusability and cost saving: In the test device of the present invention, except for the nitrogen bottle that needs to be replaced, all parts and components as well as the micro camera, temperature thermocouple, pressure sensor, etc. can be reused, thereby saving test costs;

[0034] (5) Quantification of the shape of the grain: The present invention uses digital image correlation technology (DIC technology) to spray randomly distributed speckles on the surface of the film, and uses a micro high-speed camera to record the images of the film before and after deformation. The speckle information will be displayed in grayscale. A specific search method and correlation function are used to match the feature points on the deformation image, and finally the corresponding strain value and position value are obtained to complete the measurement of the shape of the grain;

[0035] (6) Collaborative visualization of temperature and pressure: The present invention uses real-time measurement of temperature thermocouples and pressure sensors. The processes of heating and pressure increase, temperature and pressure maintenance, and cooling and pressure reduction in the test are clearly visible on the data acquisition instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic cross-sectional view (front view) of the main structure of a device for measuring the shape variation of a solid propellant during pressurized curing.

[0037] Figure 2 This is a schematic diagram of the macro layout (top view) of a device for measuring the shape variable of a grain during pressurized solidification of a solid propellant proposed by the present invention;

[0038] Figure 3 This is an exploded schematic diagram of the upper cover and upper flange of the pressurized tank of the present invention;

[0039] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0040] Figure 5 This is a schematic diagram of the DIC principle mentioned in Example 1 of the present invention.

[0041] In the figure: 1. Metal hose A; 2. Insulation box; 3. Hose connecting seat; 4. Upper cover; 5. Upper flange; 6. Air guide cylinder; 7. Pressurized tank cavity; 8. Cylinder flange; 9. Cylinder; 10. Lower flange; 11. Cylinder bottom plate; 12. Pressure data transmission line; 13. Temperature data transmission line; 14. Pressure sensor; 15. Pressure sensor base; 16. Threading cap; 17. Sealing silicone; 18. Threading base; 19. Miniature camera; 20. Temperature thermocouple; 21. Film; 22. Slurry; 23. Pressurized tank bottom plate; 24. High-pressure nitrogen cylinder; 25. Pressure reducing valve; 26. Metal hose B; 27. Hand valve; 28. Data acquisition instrument; 41. Secondary sealing gasket; 42. Cross-shaped sealing gasket; 43. Positioning groove; 51. Pressing ring; 52. Pressing groove; 53. Arc-shaped pressing block; 54. Return spring; 55. Pressing plate. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Example 1:

[0044] See also Figure 1-5 The present invention proposes a device for measuring the shape variables of a solid propellant during pressurized solidification, which includes an air supply system, a solidification system, and a data acquisition system.

[0045] The gas supply system includes a metal hose A1, a hose connector 3, an air guide 6, a high-pressure nitrogen cylinder 24, a pressure reducing valve 25, a metal hose B 26, and a hand valve 27. The high-pressure nitrogen cylinder 24 is secured to a cylinder stand to prevent it from tipping over and is threadedly connected to the pressure reducing valve 25. Adjusting the pressure reducing valve 25 reduces the pressure within the cylinder, allowing the required high-pressure gas to flow to the curing system. The metal hose B 26 is threadedly connected to the high-pressure nitrogen cylinder 24 and the curing system, serving as the system's air supply. The metal hose B 26 is threadedly connected to the metal hose A1 via a tee, and the hand valve 27 is also threadedly secured to the end of the metal hose B 26.

[0046] The curing system includes an insulation box 2, a pressurized tank cover 4, an upper flange 5, a pressurized tank cavity 7, a cylinder flange 8, a cylinder 9, a cylinder bottom plate 11, a lower flange 10, a pressure sensor base 15, a threading pressure cap 16, a sealing silica gel 17, a threading base 18, a film 21, a slurry 22, and a pressurized tank bottom plate 23; the pressurized tank cover 4 is connected to the metal hose A1 through a hose connector 3, so that high-pressure nitrogen can enter the pressurized tank smoothly and steadily; the pressurized tank cavity 7 is connected to the pressurized tank cover 4 through the upper flange 5 bolts, and is connected to the pressurized tank bottom plate 23 is connected by bolts through the lower flange 10; the cylinder body 9 is connected to the cylinder flange 8 and the cylinder bottom plate 11 by bolts; the threading pressure cap 16 is connected to the threading base 18 by threads and sealed with sealing silicone 17, and small holes are left on the pressurized tank cover 4 and the sealing silicone 17 for the temperature thermocouple 20 to pass through the pressurized tank cover 4 and enter the cavity; the pressure sensor base 15 is used to connect the pressure sensor 14 to realize real-time measurement of pressure; the film 21 is fixed between the lower surface of the cylinder flange 8 and the upper surface of the cylinder body 9 through the cylinder flange 8.

[0047] A positioning groove 43 is provided on the upper cover 4 and the upper flange 5 of the pressurized tank. A cross-shaped sealing gasket 42 is installed in the positioning groove 43. An annular sealing ring is fixedly installed on the outer side of the cross-shaped sealing gasket 42. A secondary sealing gasket 41 is sleeved on the outer side of the cross-shaped sealing gasket 42. The secondary sealing gasket 41 is installed between the upper cover 4 and the upper flange 5 of the pressurized tank.

[0048] Among them, under the action of the cross-fitting sealing gasket 42, when the pressurized tank upper cover 4 and the upper flange 5 are sealed, the cross-fitting sealing gasket 42 can be fully sealed. At the same time, an annular sealing ring is fixedly installed on the outside of the cross-fitting sealing gasket 42 to increase the secondary sealing of the pressurized tank upper cover 4 and the outer side of the upper flange 5. At the same time, in order to prevent the internal damage of the sealing gasket, this solution is equipped with a secondary sealing gasket 41 on the outside of the cross-fitting sealing gasket 42. The secondary sealing gasket 41 can achieve secondary sealing of the pressurized tank upper cover 4 and the upper flange 5, thereby reducing the air pressure leakage caused by the damage of the sealing gasket. At the same time, the cross-fitting sealing gasket 42 and the secondary sealing gasket 41 are both made of highly elastic and high-temperature corrosion-resistant materials.

[0049] Bolt holes are evenly provided on the upper cover 4 and the upper flange 5 of the pressurized tank, and a pressure groove 52 is provided on the upper side of the bolt hole. A pressure ring 51 is slidably installed in the pressure groove 52, and a pressure plate 55 is provided on the circumference below the pressure ring 51. The pressure plate 55 has an arc-shaped extrusion surface on the side close to the pressure ring 51, and an arc-shaped extrusion surface is also provided below the pressure ring 51. The pressure plate 55 is slidably installed in the bolt hole for uniform extrusion of the bolt on the sealing gasket.

[0050] Among them, the pressure ring 51 can be squeezed by tightening the bolts, and at this time, the lower surface of the pressure ring 51 and the upper surface of the pressure plate 55 can be directly squeezed against each other by tightening the bolts, driving the pressure plate 55 to squeeze the surface of the bolt, thereby preventing the bolts from causing uneven squeezing of the sealing gasket when tightening the pressurized tank upper cover 4 and the upper flange 5, thereby reducing the damage to the sealing gasket caused by the different tightening degrees of the bolts and reducing the service life of the sealing gasket.

[0051] The data acquisition system includes a pressure data transmission line 12, a temperature data transmission line 13, a pressure sensor 14, a micro camera 19, a temperature thermocouple 20, and a data acquisition instrument 28; the pressure sensor 14 is connected to the pressure sensor base 15 by a threaded connection to measure the pressure in the pressurized cavity in real time, and transmit the measured data to the data acquisition instrument 28 through the pressure data transmission line 12; the temperature thermocouple 20 passes through the threading cap 16, the sealing silicone 17, the threading base 18, and the fine holes left in the pressurized tank cover to measure the temperature in the pressurized tank cavity 7, and transmits the measured data to the data acquisition instrument 28 through the temperature data transmission line 13; the micro camera 19 is fixed to the bottom of the upper cover 4 by a threaded connection, and the head of the machine is aimed at the film 21 to realize real-time photography of the deformation of the film 21.

[0052] The film 21 is made of butyl rubber, which has high elasticity and high toughness properties, and can prevent the shape of the drug column from changing too much during the pressurized curing process, causing the film 21 to expand and break, leading to dangerous situations such as drug leakage.

[0053] The temperature thermocouple 20 passes through the fine holes of the threading pressure cap 16, the sealing silica gel 17, the threading base 18, and the pressurized tank cover 4 to directly measure the temperature in the slurry 22. The diameter of the temperature thermocouple 20 should match the three fine holes to prevent air leakage.

[0054] The head of the micro camera 19 should be aligned with the film 21 to achieve real-time photography of the entire surface of the film 21, and the head should be lower than the front end of the temperature thermocouple 20 to prevent the temperature thermocouple 20 from blocking the camera; the entire micro camera 19 should be fixed as far away from the gas guide cylinder 6 as possible to avoid interference or even damage to the micro camera 19 by high-pressure gas during air intake and exhaust;

[0055] The slurry 22 avoids direct contact with high-pressure nitrogen through the film 21, reducing the danger of the pressurized curing experiment;

[0056] The cylinder body 9 should be tightly connected to the cylinder flange 8 and the cylinder bottom plate 11 to prevent drug leakage, which may cause the slurry 22 to enter between the cylinder flange 8 and the upper surface of the cylinder body 9, squeezing the slurry 22 and causing unnecessary danger; the pressurized tank cavity 7 should be tightly connected to the pressurized tank upper cover 4 and the pressurized tank bottom plate 23 to prevent air leakage.

[0057] The present invention further proposes a method for measuring the shape variables of a solid propellant during pressurized curing, comprising the following steps:

[0058] Assemble the test device: connect the pressure tank cavity 7 to the pressure tank cover 4 through the upper flange 5 bolts, and connect it to the pressure tank bottom plate 23 through the lower flange 10 bolts, and check the airtightness;

[0059] Gas source installation and fixation: Install the high-pressure nitrogen cylinder 24 on the anti-dumping cylinder stand;

[0060] Install and secure the gas supply pipeline, various sensors, and data transmission lines: Thread the metal hose A1 to connect the high-pressure nitrogen cylinder 24 to the curing system, serving as the curing system's gas supply pipeline. Thread the pressure sensor 14 to the pressure sensor base 15. Insert the temperature thermocouple 20 through the threading cap 16, the sealing silicone 17, the threading base 18, and the holes in the pressurized tank's upper cover 4. Transmit the measured data to the data acquisition device 28 via the pressure data transmission line 12 and the temperature data transmission line 13. Turn on the data acquisition device 28 and perform an initial signal check.

[0061] The slurry 22 is poured into the cylinder 9 by vacuum pouring method and the device is sealed;

[0062] Open the high-pressure nitrogen cylinder 24 to supply gas and adjust the working state of the pressure reducing valve 25;

[0063] Conduct pressurized curing tests and collect data in real time. The schematic diagram of the DIC technology principle is as follows: Figure 3 ;

[0064] After the test is completed, close the pressure reducing valve 25, open the manual valve 27, and discharge the gas from the metal hose B 26.

[0065] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, and these changes should be covered by the scope of protection of the present invention.

Claims

1. A device for measuring the shape variables of a solid propellant during pressurized curing, characterized in that: The device includes an air supply system, a curing system, and a data acquisition system, wherein: The gas supply system comprises a high-pressure nitrogen cylinder (24), which is fixed on a cylinder stand and is provided with a pressure reducing valve (25) installed on the high-pressure nitrogen cylinder (24). The pressure reducing valve (25) is used to adjust the pressure in the high-pressure nitrogen cylinder (24); a metal hose A (1) is connected to the pressure reducing valve (25), and one end of the metal hose A (1) away from the pressure reducing valve (25) is connected to the curing system and serves as an air inlet pipe of the curing system; a metal hose B (26) is connected to the metal hose A (1) via a tee pipe, and a hand valve (27) is fixedly installed at the pipe mouth of the metal hose B (26); The top of the curing system is connected to a data transmission line, and one end of the data transmission line away from the curing system is connected to a data acquisition device (28) of the data acquisition system; The curing system comprises a heat preservation box (2), a pressurized tank bottom plate (23) is provided at the bottom end of the heat preservation box (2), a pressurized tank cavity (7) is placed on the pressurized tank bottom plate (23), and the bottom end of the pressurized tank cavity (7) is fixed to the pressurized tank bottom plate (23) through a lower flange (10); a pressurized tank upper cover (4) is provided above the pressurized tank cavity (7), and the pressurized tank upper cover (4) is fixed to the top of the pressurized tank cavity (7) through an upper flange (5); the pressurized tank upper cover ( 4) is provided with a hose connection seat (3) and a pressure sensor base (15); one end of the metal hose A (1) away from the high-pressure nitrogen bottle (24) is fixedly connected to the hose connection seat (3); the bottom end of the hose connection seat (3) is fixedly connected to an air guide cylinder (6), and the air guide cylinder (6) is arranged inside the pressurized tank cavity (7); a pressure sensor (14) is provided on the pressure sensor base (15), and a pressure data transmission line (12) is connected to the pressure sensor (14).

2. The device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 1, wherein: The pressurized tank upper cover (4) and the upper flange (5) are both provided with positioning grooves (43), a cross-shaped sealing gasket (42) is installed in the positioning groove (43), an annular sealing ring is fixedly installed on the outer side of the cross-shaped sealing gasket (42), a secondary sealing gasket (41) is sleeved on the outer side of the cross-shaped sealing gasket (42), and the secondary sealing gasket (41) is installed between the pressurized tank upper cover (4) and the upper flange (5).

3. The device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 2, wherein: Bolt holes are evenly provided on the upper cover (4) and the upper flange (5) of the pressurized tank, and a pressure groove (52) is provided on the upper side of the bolt hole. A pressure ring (51) is slidably installed in the pressure groove (52). A pressure plate (55) is provided on the circumference below the pressure ring (51). An arc-shaped extrusion surface is provided on the side of the pressure plate (55) close to the pressure ring (51). An arc-shaped extrusion surface is also provided below the pressure ring (51). The pressure plate (55) is slidably installed in the bolt hole for uniformly extruding the sealing gasket by the bolt.

4. The device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 1, wherein: The curing system further comprises a cylinder (9), the cylinder (11) being arranged inside the pressurized tank cavity (7), the cylinder (9) containing the slurry (22), a cylinder flange (8) being arranged at the top of the cylinder (9), and a film (21) being fixedly connected to the bottom surface of the cylinder flange (8); A threading base (18) is provided at the center of the top surface of the pressurized tank cover (4), a threading pressure cap (16) is connected to the threading base (18), and a sealing silica gel (17) is provided between the threading pressure cap (16) and the threading base (18); fine holes are provided on the threading base (18), the threading pressure cap (16), the sealing silica gel (17) and the pressurized tank cover (4), and a temperature thermocouple (20) is installed through the fine hole for measuring the temperature in the pressurized tank cavity (7), and a temperature data transmission line (13) is connected to the top of the temperature thermocouple (20).

5. The device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 1, wherein: The data acquisition system comprises a pressure data transmission line (12), a temperature data transmission line (13), a pressure sensor (14), a micro camera (19), a temperature thermocouple (20), and a data acquisition instrument (28); the pressure sensor (14) is connected to the data acquisition instrument (28) via the pressure data transmission line (12), and the temperature thermocouple (20) is connected to the data acquisition instrument (28) via the temperature data transmission line (13); The micro camera (19) is installed inside the pressurized tank cavity (7) near the film (21) and is used to monitor the deformation of the film (21) in real time.

6. A device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 2 or 3, characterized in that: The film (21) is made of butyl rubber and has high elasticity and high toughness properties, and is used to prevent the film (21) from expanding and breaking.

7. The device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 2, wherein: The inner diameter of the fine hole matches the diameter of the temperature thermocouple (22) to avoid air leakage.

8. A device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 2 or 3, characterized in that: The film (21) is provided to prevent the medicine slurry (22) from directly contacting with high-pressure nitrogen, thereby reducing the danger of the pressurized curing experiment.

9. The device for measuring the shape variation of a grain during pressurized solidification of a solid propellant according to claim 2, wherein: The cylinder body (9) is tightly connected to the cylinder body flange (8) and the cylinder body bottom plate (11) to prevent drug leakage, so that the drug slurry (22) enters between the cylinder body flange (8) and the upper surface of the cylinder body (9), causing squeezing of the drug slurry (22); the pressurized tank cavity (7) is tightly connected to the pressurized tank upper cover (4) and the pressurized tank bottom plate (23) to prevent air leakage.

10. The method for measuring the shape variables of a solid propellant during pressurized curing process implemented by the device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Assemble the test device: fix the pressure tank cavity (7) to the pressure tank upper cover (4) through the upper flange (5), and fix it to the pressure tank bottom plate (23) through the lower flange (10), and check the airtightness; S2. Gas source installation and fixation: Install the high-pressure nitrogen cylinder (24) on the anti-dumping cylinder stand; S3. Install and fix the gas supply pipeline, various sensors and data transmission lines: connect the high-pressure nitrogen cylinder (24) to the curing system through a threaded connection with the metal hose A (1), which serves as the gas supply pipeline of the curing system; connect the pressure sensor (14) to the pressure sensor base (15) through a threaded connection, and pass the temperature thermocouple (20) through the threading cap (16), the sealing silica gel (17), the threading base (18), and the fine holes left on the upper cover (4) of the pressurized tank, and transmit the measured data to the data acquisition instrument (28) through the pressure data transmission line (12) and the temperature data transmission line (13). Turn on the data acquisition instrument (28) and perform a preliminary signal inspection; S4, pouring the slurry (22) into the cylinder (9) by a vacuum pouring method and sealing the device; S5. Open the high-pressure nitrogen bottle (24) to supply gas and adjust the working state of the pressure reducing valve (25); S6. Perform a pressurized curing test and collect data in real time; S7. After the test is completed, close the pressure reducing valve (25), open the hand valve (27), and discharge the gas from the metal hose B (26).

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