A device and method for monitoring the solidification of cast explosive

Abstract

The application discloses a kind of melt-cast explosive solidification forming monitoring device and method, device includes temperature control oven, the temperature control oven includes the temperature control oven main body being provided with mounting cavity, and the box door being provided at the front end of the temperature control oven main body, rotating base is provided in the mounting cavity, multiple charging sites are spaced apart and arranged on the rotating base, an explosive body mold is provided on each charging site, and the top end of the explosive body mold is connected with a riser hopper;Vacuum tube and injection tube are provided on the top plate of the temperature control oven main body, and the bottom of the injection tube is provided with injection port;X-ray detector, infrared thermal imager and multiple temperature acquisition devices are further provided in the temperature control oven main body.The device realizes the coupling of charging, solidification nursing and process monitoring, multiple charging sites can be independent of each other, can also be combined with each other, effectively improves the monitoring efficiency, and can provide dynamic parameters for process optimization.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of melt-cast explosive charging and solidification, and particularly relates to a melt-cast explosive solidification forming monitoring device and method. BACKGROUND

[0002] The solidification quality of melt-cast explosive plays a key role in the detonation performance and safety performance of a warhead. In order to meet the requirements of high energy density, high damage and use safety, it is necessary to strictly control the shrinkage porosity, shrinkage cavity and bottom gap crack defects that may be caused by explosive column solidification during the warhead charging process. The generation of these defects is closely related to the solidification care process, and the formation of the above defects needs to be reduced through process optimization. The existing melt-cast charging process optimization includes liquid explosive pouring charging process optimization and explosive liquid solidification forming process optimization. Among them, the vacuum vibration casting solidification, pressurized solidification and water bath directional solidification can reduce the formation of defects to a certain extent. In addition, in the research on high-quality solidification forming of melt-cast explosive, the formation of defects can also be reduced to a certain extent through process monitoring, such as using an infrared thermal imager, a thermistor and an X-ray detector for online monitoring of solidification quality to monitor the temperature field. For example, Kumar et al. analyzed the effect of temperature field on solidification quality by monitoring the spatial temperature dynamic change of TNT-based melt-cast explosive during solidification. Li Jingming et al. monitored the shrinkage porosity of TNT and RHT melt-cast explosive by X-ray, and improved the solidification quality of the column by optimizing the process parameters. The above methods only improve a certain link of the melt-cast explosive solidification forming, and the effect on improving the solidification quality is limited.

[0003] In summary, since the optimization of charging and solidification process and the online monitoring of melt-cast explosive solidification process are crucial to the high-quality and precise forming of explosive, it is of great significance to develop a device and process that can couple charging, solidification care and process monitoring. SUMMARY

[0004] In view of the above technical problems, the application discloses a melt-cast explosive solidification forming monitoring device and method to solve the technical problems that defects are easily formed in the charging and solidification process of the warhead, and the solidification quality of the column needs to be improved.

[0005] The application is implemented by specifically adopting the following technical solutions:

[0006] A melt-cast explosive solidification forming monitoring device, comprising a temperature control oven, wherein the temperature control oven comprises a temperature control oven main body provided with a mounting cavity, and a door provided at the front end of the temperature control oven main body, a rotating base is arranged in the mounting cavity, a plurality of charging positions are arranged at intervals on the rotating base, an explosive body mold is arranged on each charging position, and a riser funnel is connected to the top end of the explosive body mold.

[0007] A vacuum pipe and a medicine injection pipe are arranged through the top plate of the temperature control oven body, and the bottom of the medicine injection pipe is provided with a medicine injection port.

[0008] The temperature control oven body is also provided with an X-ray detector, an infrared thermal imager, and a plurality of temperature acquisition devices.

[0009] The application also has the following technical features:

[0010] Specifically, the number of charging positions is three, and the included angle formed by the connecting lines of adjacent two charging positions and the center is 120°.

[0011] Further, the temperature acquisition device includes a riser funnel internal medicine temperature measuring thermistor, an oven internal temperature measuring thermistor and a base temperature measuring thermistor, the riser funnel internal medicine temperature measuring thermistor is arranged through the top plate of the temperature control oven body and can move vertically, the oven internal temperature measuring thermistor and the base temperature measuring thermistor are arranged through the side plate of the temperature control oven body, and the base temperature measuring thermistor can be connected with the rotating base.

[0012] Further, the door is provided with an observation window and a handle.

[0013] Further, the top plate of the oven body is provided with a first sliding rail, the back plate of the temperature control oven is provided with a second sliding rail, the first sliding rail and the second sliding rail are connected and arranged perpendicularly, and the infrared thermal imager can move along the first sliding rail and the second sliding rail.

[0014] Further, the side plate of the temperature control oven body is also provided with a third sliding rail vertically, and the X-ray detector is connected with the third sliding rail.

[0015] Further, the medicine injection pipe is also provided with a medicine injection flow monitoring meter, and the vacuum pipe is also provided with a valve.

[0016] The application also protects a melting and casting explosive solidification molding monitoring method, which is realized by the above-mentioned melting and casting explosive solidification molding monitoring device and includes the following steps

[0017] Step 1, assembling the monitoring device;

[0018] Step 2, starting the vacuum pump to vacuumize the inside of the temperature control oven to 5x10 -1 ~ 50Pa;

[0019] Step 3, preheating the elastic body mold to the liquid temperature of the pre-poured melting and casting explosive, after the difference between the inside temperature of the oven and the base temperature is less than 1℃, opening the valve to complete the charging;

[0020] Step 4, start the infrared thermal imager and the X-ray detector;

[0021] Step 5, according to the thermal physical parameters of the pre-cast melt-cast explosive, select the solidification mode, complete the solidification nursing; in the process of solidification nursing, the infrared thermal imager and the X-ray detector are used to collect data in real time;

[0022] Step 6, process the data collected by the infrared thermal imager and the X-ray detector, and obtain the thermal image distribution of the shell mold and the X-ray image of the explosive column cooling and solidification, respectively.

[0023] As preferred, the solidification mode includes gradient cooling solidification and linear cooling solidification.

[0024] As preferred, the length of the solidification nursing process is 3-5h.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] (1) The device of the present application can realize simultaneous solidification nursing of charging and multiple stations, multiple charging stations can be independent of each other or combined with each other, effectively improving the monitoring efficiency.

[0027] (2) The device of the present application contains three contact type thermistors and a non-contact infrared thermal imager, which can more accurately reflect the temperature in the box by combining the thermistors and the thermal imager, accurately determine the preheating node of the shell, and accurately provide the temperature difference change in the cooling and solidification process of the explosive column, realizing high-quality solidification monitoring of the explosive column.

[0028] (3) The method of the present application realizes real-time collection of data of the melt-cast explosive charging, cooling and solidification forming process by coupling charging, solidification nursing and process monitoring, and provides dynamic parameters for later process optimization.

[0029] Other advantages of the present application are described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the overall structure schematic diagram of the preparation device of embodiment 1 of the present application.

[0031] Figure 2 is the cross-sectional view of the preparation device of embodiment 1 of the present application.

[0032] Explanation of each number in the figure:

[0033] 1-temperature control oven body, 2-oven door, 3-rotary base, 4-charging position, 5-bullet mold, 6-overflow funnel, 7-vacuum tube, 8-charge injection tube, 9-charge injection port, 10-X-ray detector, 11-infrared thermal imager, 12-overflow funnel internal charge temperature measuring thermistor, 13-oven internal temperature measuring thermistor, 14-base temperature measuring thermistor, 15-observation window, 16-handle, 17-first slide rail, 18-second slide rail, 19-third slide rail, 20-charge injection flow monitoring meter, 21-valve, 22-absorbing X-ray lead plate. DETAILED DESCRIPTION

[0034] The specific embodiments of the present application are given below, it should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "connected" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected or integrated; it can be directly connected, or it can be indirectly connected, and the like. For those skilled in the art, the specific meanings of the above terms in the technical solution can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise stated, the orientation words such as "up, down, bottom, top" generally refer to the definition based on the drawing surface of the corresponding drawing, "inner, outer" refers to the definition based on the outline of the corresponding drawing, and "front, rear" refers to the definition based on the direction of gas flow.

[0036] The present application is not limited to the following specific embodiments, and each specific technical feature described in the following specific embodiments can be combined in any appropriate manner without contradiction, as long as it does not deviate from the idea of the present application, and should also be regarded as disclosed by the present application.

[0037] Example 1

[0038] According to the above technical solution, such as Figure 1 and Figure 2As shown, the embodiment discloses a cast explosive solidification forming monitoring device, which comprises a temperature control oven, the temperature control oven comprises a temperature control oven main body 1 provided with a mounting cavity inside, and a box door 2 hinged to the front end of the temperature control oven main body 1, the oven main body 1 is enclosed by a top plate, a bottom plate, a back plate and side plates, a rotating base 3 is arranged in the mounting cavity, the rotating base 3 is installed on the floor and can rotate relative to the bottom plate, three charging positions 4 are arranged on the rotating base 3 at intervals, and the included angle formed by the connecting lines of adjacent two charging positions 4 and the center is 120°. An elastic body mold 5 is arranged on each charging position 4, the elastic body mold 5 is detachably installed on the charging position 4, and the top end of the elastic body mold 5 is connected with a riser funnel 6; the elastic body mold 5 is used for containing casted cast explosive. The interval arrangement of the three charging positions 4 can ensure that the elastic body mold 5 on each charging position is tested independently in the subsequent monitoring process.

[0039] A vacuum pipe 7 and a medicine injection pipe 8 are arranged through the top plate of the temperature control oven main body 1, a vacuum pump is connected to the vacuum pipe 7, and the temperature control oven can be evacuated by means of the vacuum pump and the vacuum pipe 7; a medicine injection port 9 is arranged at the bottom of the medicine injection pipe 8, the medicine injection pipe 8 is used for filling the medicine into the elastic body mold 5, and the medicine injection port 9 is arranged on the rotation track of the elastic body mold 5, so that the medicine can enter the elastic body mold 5 through the medicine injection port 9 and the riser funnel 6. Under the vacuum condition, the medicine in the elastic body mold 5 can be accurately filled without air bubbles by means of the medicine injection pipe 8.

[0040] The temperature control oven main body 1 is also provided with an X-ray detector 10, an infrared thermal imager 11 and a plurality of temperature acquisition devices, wherein the X-ray detector 10 is used for acquiring X-ray images of the cast explosive in the charging, cooling and solidification processes, the infrared thermal imager 11 is used for acquiring and transmitting temperature data in the solidification process of the cast explosive, and finally a thermal image distribution map is obtained by means of an existing conversion program arranged in a control system, so as to realize online monitoring of temperature evolution and temperature difference in different regions of the temperature control oven main body 1. In order to absorb and protect against harmful rays, a lead plate 22 can be arranged in the mounting cavity. In the embodiment, the lead plate 22 is arranged on the side plate of the temperature control oven main body 1.

[0041] The temperature control oven main body 1 is connected with a control system, the control system comprises a charging control module, a pressure control module, a temperature control module and an online monitoring module, the charging control module is connected with a flow meter, the pressure control module is connected with a vacuum pump, the temperature control module is connected with a temperature acquisition device, and the online monitoring module is connected with the infrared thermal imager 11 and the X-ray detector respectively. Programs capable of controlling the actions of the corresponding devices are arranged in the control system.

[0042] As a preferred scheme of the embodiment, the temperature collecting device comprises a riser funnel inner charge temperature measuring thermistor 12 for measuring the temperature of the molten cast explosive in the riser funnel, an oven interior temperature measuring thermistor 13 for measuring the temperature in the installation cavity, and a base temperature measuring thermistor 14 for measuring the temperature of the rotating base. The riser funnel inner charge temperature measuring thermistor 12 is arranged on the top plate of the temperature control oven body 1, can move up and down in the vertical direction, and is arranged on the rotating track of the bullet mold 5. The oven interior temperature measuring thermistor 13 and the base temperature measuring thermistor 14 are both arranged on the side plate of the temperature control oven body 1, and the base temperature measuring thermistor 14 can be in contact with the rotating base 3.

[0043] As a preferred scheme of the embodiment, the box door 2 is provided with an observation window 15 and a handle 16. The observation window 15 can be used to observe the charging condition and the height of the riser funnel inner charge temperature measuring thermistor inserted into the bullet mold 5, and the handle 16 can be used to open or close the box door 2.

[0044] As a preferred scheme of the embodiment, the top plate inner wall of the temperature control oven body 1 is provided with a first sliding rail 17, the back plate inner wall of the temperature control oven body 1 is provided with a second sliding rail 18, the first sliding rail 17 and the second sliding rail 18 are arranged in perpendicular connection, and the infrared thermal imager 11 can move along the first sliding rail 17 and the second sliding rail 18.

[0045] As a preferred scheme of the embodiment, the side plate inner wall of the temperature control oven body 1 is further provided with a third sliding rail 19 in the vertical direction, and the X-ray detector 10 is in sliding connection with the third sliding rail 19, i.e., the X-ray detector 10 can move along the third sliding rail 19.

[0046] As a preferred scheme of the embodiment, the injection pipe 8 is further provided with an injection flow monitoring meter 20 for collecting injection flow information in real time. The vacuum pipe 7 is further provided with a valve 21 for controlling the on-off of the vacuum pipe 7.

[0047] Embodiment 2

[0048] The embodiment discloses a molten cast explosive solidification molding monitoring method, which is realized by the molten cast explosive solidification molding monitoring device provided in the embodiment 1, and comprises the following steps.

[0049] Step 1, assembling the monitoring device;

[0050] Step 2, starting the vacuum pump to vacuumize the interior of the temperature control oven to 5×10 -1 ~ 50 Pa;

[0051] Step 3, preheat the body mold to the liquid temperature of the pre-poured cast explosive, after the difference between the internal temperature of the oven and the base temperature is less than 1℃, open the valve, and complete the charging;

[0052] Step 4, start the infrared thermal imager and the X-ray detector;

[0053] Step 5, according to the thermal physical parameters of the pre-poured cast explosive, select the solidification mode, and complete the solidification care; the solidification mode includes gradient cooling solidification and linear cooling solidification;

[0054] In the process of solidification care, real-time data acquisition is performed through the infrared thermal imager and the X-ray detector;

[0055] The length of the solidification care process is 3-5h.

[0056] Step 6, process the data collected by the infrared thermal imager and the X-ray detector, and obtain the thermal image distribution map of the body mold and the X-ray image of the column cooling solidification, respectively.

[0057] In actual operation, the liquid-solid phase change and defect structure evolution pictures in the cooling and solidification process of the explosive can be obtained from the X-ray image of the column cooling solidification.

[0058] Application Example 1

[0059] This application example uses the device disclosed in Example 1 and the method disclosed in Example 2 to complete the charging of the melt black ladder explosive and the online monitoring of the multi-station solidification molding, which specifically includes the following steps:

[0060] Step 1, complete the assembly of the monitoring device;

[0061] Install the whole process device, including the body mold 5, connect the temperature acquisition device, the X-ray detector 10 and the infrared thermal imager 11, connect the vacuum pipe 7 and the injection pipe 8, and turn on the power of the control system;

[0062] Step 2, start the vacuum pump, and after the internal temperature of the oven is vacuumed to 10Pa, close the valve;

[0063] Step 3, preheat the body mold to the liquid temperature of the melt black ladder explosive at a temperature rising rate of 10℃ / min, after the difference between the internal temperature of the oven and the base temperature is less than 1℃, open the valve 21, and perform the injection charging process; insert the other end of the injection pipe 8 into the melting pot containing the melt black ladder explosive, set the injection flow rate to 1L / min, and the filling height of the melt black ladder explosive reaches half of the riser funnel 6, after the charging is completed, rotate the rotating base 3 until all three body molds 5 are charged.

[0064] Step 4, turn on the infrared thermal imager and adjust its position, so that the distance between the infrared thermal imager and the bullet mold 5 is 200 mm, and the collection angle is adjusted; turn on the X-ray detector, set the voltage to 8KV, the current to 5mA, and the exposure time to 1h.

[0065] Step 5, according to the thermal physical parameters such as melting point, specific heat, viscosity and thermal conductivity of the melt black powder, the gradient cooling solidification mode is selected: 85℃ for 5min, 60℃ for 20min, 40℃ for 20min, 20℃ for 20min, until the temperature value of the temperature resistance measured by the temperature resistance in the riser funnel is 20℃, stop cooling and close the oven, and the cooling and solidification time of a single test is 3.5h.

[0066] Step 6, correct the contrast and brightness of the infrared thermal imager image acquisition, output the thermal image distribution and temperature difference change data after processing; output the X-ray imaging in the cooling and solidification process of the propellant grain, and then obtain the liquid-solid phase change and defect structure evolution picture.

[0067] Clean the mold and turn off the power: after the propellant grain cools to room temperature, the argon in the oven is filled to standard atmospheric pressure, the bullet mold is taken out, and the mold is disassembled, the propellant grain is shaped, and the mold is cleaned.

[0068] The method of the application realizes real-time acquisition of data of the charging, cooling and solidification forming process of the melt-cast explosive by coupling of charging, solidification care and process monitoring, and provides dynamic parameters for process optimization in the later period.

[0069] Application Example 2

[0070] In this application example, the device disclosed in Example 1 and the method disclosed in Example 2 are used to monitor the charging and multi-station solidification forming of DNAN / HMX melt-cast explosive online, which specifically includes the following steps:

[0071] Step 1, complete the assembly of the monitoring device;

[0072] Install the whole process device, including the bullet mold 5, connect the temperature acquisition device, the X-ray detector and the infrared thermal imager, connect the vacuum pipe 7 and the propellant injection pipe 8, and turn on the power of the control system;

[0073] Step 2, start the vacuum pump, and after the inside of the oven is vacuumed to 15Pa, close the valve;

[0074] Step 3, preheat the elastic body mold to the liquid temperature 96℃ of the DANN / HMX mixed explosive at a temperature rising rate of 10℃ / min, after the difference between the internal temperature and the base temperature of the oven is less than 1℃, open the valve to perform the explosive charging process; insert the other end of the explosive charging pipe 8 into the melting pot containing the DANN / HMX mixed explosive, set the explosive charging flow rate to 1.5L / min, and the charging height to half of the riser funnel 6, after the charging is completed, rotate the rotating base 3 until all three elastic body molds 5 are charged.

[0075] Step 4, turn on the infrared thermal imager and adjust its position to make the distance between the infrared thermal imager and the elastic body mold 5 be 150mm, and adjust the collection angle; turn on the X-ray detector and set the voltage to 8KV, the current to 6mA, and the exposure time to 1.5h.

[0076] Step 5, according to the thermal physical parameters of the DANN / HMX cast explosive such as melting point, specific heat, viscosity and thermal conductivity, select the gradient cooling solidification mode: 95℃ for 5min, 80℃ for 30min, 50℃ for 20min, 20℃ for 20min, until the temperature value of the temperature resistance measured by the riser funnel is 20℃, stop cooling and close the oven, and the cooling and solidification time of a single test is 4h.

[0077] Step 6, correct the contrast and brightness of the infrared thermal imager collected image, and output the thermal image distribution and temperature difference change after the processed signal is converted by D / A; output the X-ray imaging of the explosive column during the cooling and solidification process to obtain the liquid-solid phase change and defect structure evolution picture.

[0078] Clean the mold and turn off the power: after the explosive column cools to room temperature, fill argon into the oven to standard atmospheric pressure, take out the elastic body mold, and perform mold disassembly, explosive column shaping and mold cleaning.

[0079] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0080] In addition, any combination of various different embodiments of the present application can also be made, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

[0081] It should be noted that all the components involved in the present embodiment, except for the special ones, are components that can be obtained by purchase in the prior art.

Claims

1. A monitoring device for solidification and molding of cast explosives, comprising a temperature-controlled oven, the temperature-controlled oven comprising a main body (1) having an installation cavity, and a door (2) disposed at the front end of the main body (1), characterized in that, The mounting cavity is provided with a rotating base (3), and a plurality of charge positions (4) are provided at intervals on the rotating base (3). Each charge position (4) is provided with a projectile mold (5), and the top of the projectile mold (5) is connected to a riser funnel (6). The temperature-controlled oven body (1) has a vacuum tube (7) and a drug injection tube (8) on its top plate, and the drug injection tube (8) has a drug injection port (9) at its bottom. The temperature-controlled oven body (1) is also equipped with an X-ray detector (10), an infrared thermal imager (11), and multiple temperature acquisition devices. The temperature acquisition device includes a thermocouple (12) for measuring the temperature of the medicine inside the riser funnel, a thermocouple (13) for measuring the temperature inside the oven, and a thermocouple (14) for measuring the temperature of the base. The thermocouple (12) for measuring the temperature of the medicine inside the riser funnel is installed on the top plate of the temperature-controlled oven body (1) and can move vertically. The thermocouple (13) for measuring the temperature inside the oven and the thermocouple (14) for measuring the temperature of the base are both installed on the side plate of the temperature-controlled oven body (1) and the thermocouple (14) for measuring the temperature of the base can be connected to the rotating base (3). The temperature-controlled oven body (1) has a first slide rail (17) on the inner wall of the top plate and a second slide rail (18) on the inner wall of the back plate. The first slide rail (17) and the second slide rail (18) are connected perpendicularly to each other. The infrared thermal imager (11) can move along the first slide rail (17) and the second slide rail (18). The inner wall of the side panel of the temperature-controlled oven body (1) is also provided with a third slide rail (19) along the vertical direction, and the X-ray detector (10) is slidably connected to the third slide rail (19).

2. The monitoring device for solidification and forming of cast explosives as described in claim 1, characterized in that, The number of the charge positions (4) is three, and the angle formed by the line connecting two adjacent charge positions (4) and the center of the circle is 120°.

3. The monitoring device for solidification and forming of cast explosives as described in claim 1, characterized in that, The box door (2) is provided with an observation window (15) and a handle (16).

4. The monitoring device for solidification and forming of cast explosives as described in claim 1, characterized in that, The injection tube (8) is also equipped with an injection flow monitoring meter (20), and the vacuum tube (7) is also equipped with a valve (21).

5. A method for monitoring the solidification and forming of cast explosives, characterized in that, The method is implemented using the solidification and forming monitoring device for cast explosives as described in any one of claims 1 to 4, and includes the following steps: Step 1: Complete the assembly of the monitoring device; Step 2: Start the vacuum pump and evacuate the temperature-controlled oven to a vacuum level of 5×10. -1 ~50Pa; Step 3: Preheat the projectile mold to the liquid temperature of the pre-cast explosive. After the temperature difference between the inside of the oven and the base is less than 1°C, open the valve to complete the loading. Step 4: Start the infrared thermal imager and X-ray detector; Step 5: Select the solidification method based on the thermophysical parameters of the pre-cast explosive and complete the solidification care process; during the solidification care process, data is collected in real time using an infrared thermal imager and an X-ray detector. Step 6: Process the data collected by the infrared thermal imager and the X-ray detector to obtain the thermal distribution map of the projectile mold and the X-ray image of the propellant column cooling and solidification, respectively.

6. The method for monitoring the solidification and forming of cast explosives as described in claim 5, characterized in that, The solidification methods include gradient cooling solidification and linear cooling solidification.

7. The method for monitoring the solidification and forming of cast explosives as described in claim 5, characterized in that, The duration of the coagulation nursing process is 3-5 hours.

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