Device for testing the extrusion friction safety characteristics of composite solid propellant slurry

Abstract

The application discloses a kind of composite solid propellant slurry extrusion friction safety characteristic testing device, comprising: from bottom to top respectively base, operating platform, integral sensor, barrel, pillar, piston and motor;Wherein, base contains hydraulic system, for providing extrusion force load;Motor is used to provide rotary load, encoder is installed on motor, for measuring the rotational speed of motor;Barrel and piston are directly contacted with solid propellant slurry, barrel is used to fill solid propellant slurry, piston is used to apply force load to slurry;Integral sensor can measure torque and pressure, for measuring the torque and extrusion force of slurry in test process.The technical scheme of the application, the load applied can cover the load range in mixing process, the load condition of friction sensitivity test can be realized and the load condition of actual working condition of slurry is consistent.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite solid propellant slurry, and particularly relates to a kind of composite solid propellant slurry extrusion friction safety characteristic testing device. BACKGROUND

[0002] In the mixing process of composite solid propellant slurry, the slurry continuously bears the extrusion and friction between the paddle-blade and the paddle-pot wall. Under the action of these loads, the temperature of the slurry may locally rise, and even cause ignition, leading to accidents.

[0003] Currently, the test characterization of the friction safety of energetic materials generally uses the BAM friction sensitivity tester in accordance with GB / T 21566-2008 "Dangerous Goods Explosive Friction Sensitivity Test Method".

[0004] However, in the friction sensitivity test method, the applied force load is large, being in the order of 10-100 MPa, and the time scale is short, being in the order of microseconds to milliseconds (μs-ms). However, in the mixing process, the force load borne by the slurry is in the order of kilo-pascal to mega-pascal (kPa-MPa), and the duration is long, being in the order of 1-100 s. Therefore, the load conditions of the existing friction sensitivity test are inconsistent with the load conditions of the slurry in the actual working conditions, and the existing friction sensitivity test method is difficult to characterize the safety problems existing in the mixing process. SUMMARY

[0005] The technical problem to be solved by the application is to provide a kind of composite solid propellant slurry extrusion friction safety characteristic testing device.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical solution:

[0007] A kind of composite solid propellant slurry extrusion friction safety characteristic testing device, from bottom to top, is base, operation table, integrated sensor, barrel, support column, piston and motor; wherein, the base contains hydraulic system, for providing extrusion force load; the motor is used to provide rotary load, and an encoder is installed above the motor for measuring the rotational speed of the motor; the barrel and the piston are in direct contact with the solid propellant slurry, the barrel is used to fill the solid propellant slurry, and the piston is used to apply force load to the slurry; the integrated sensor can measure torque and pressure, and is used to measure the torque and extrusion pressure borne by the slurry during the test.

[0008] As preferred, the solid propellant slurry is filled in the barrel as the test sample; the hydraulic system in the base drives the pressure sensor and the barrel upward by pressurization until the piston is inserted into the barrel, the piston is in contact with the slurry and is extruded until the preset extrusion load is reached; at the same time, the motor is started to drive the piston to rotate through the transmission device to realize the extrusion and friction of the slurry.

[0009] As preferred, the extrusion loading part of the test device comprises an oil cylinder, an integrated sensor, an assembly disc and a barrel to realize the application of the extrusion load; the oil cylinder is connected to the external hydraulic machine through the oil inlet and the oil outlet, and can push the transmission rod upward through hydraulic loading, the upper end of the transmission rod is connected to the integrated sensor, the assembly disc and the barrel, thereby pushing the barrel upward to cooperate with the piston to realize the application of the extrusion force to the slurry.

[0010] As preferred, the main body of the integrated sensor is a disc structure with a circular opening and multiple assembly holes in the center for connection with the transmission rod of the oil cylinder and the assembly disc.

[0011] As preferred, the main body of the assembly disc is a circular base for connecting the barrel and the integrated sensor, and the torque and pressure load of the slurry in the barrel can be transmitted to the integrated sensor through the assembly disc.

[0012] As preferred, the barrel is made of high-transparency high-strength glass material, and the structure is a cylindrical main body with an inner hole and a gap in the center and a bottom composed of an assembly block; the inner hole is used for filling the slurry, and the size of the inner hole matches the outer diameter of the piston rod; the assembly block at the bottom can match the groove of the assembly disc to fix the barrel on the assembly disc.

[0013] As preferred, the rotation loading part of the test device is composed of a motor, a shaft coupling, a fixed cylinder, a transmission shaft, a piston, a cross beam and a support column; the support column and the cross beam are structural parts, wherein the support column is assembled on the operation table and the cross beam is located at the upper end of the part.

[0014] As preferred, the motor is composed of a motor main body, an encoder and a rotating shaft; the shaft coupling is used to connect the rotating shaft of the motor and the transmission shaft.

[0015] As preferred, the upper end of the transmission shaft is connected to the rotating shaft of the motor, and the lower end is connected to the piston through a pin, thereby realizing the connection of the rotating shaft of the motor and the piston, transmitting the rotary motion of the motor to the piston rod, and realizing the rotary motion of the piston.

[0016] As preferred, the upper half of the piston is thicker and the lower half is thinner; the upper half matches the transmission shaft and has a through hole connected to the assembly hole of the transmission shaft through a pin; the lower half is a piston column with an outer diameter matching the hole diameter of the inner hole of the barrel, which can be inserted into the inner hole; the lower end surface of the piston column is an extrusion and friction end surface.

[0017] The applied load of the present application can cover the load range in the mixing process, and the load condition of the friction sensitivity test can be realized, which is consistent with the load condition of the slurry in the actual working condition; the partial extrusion friction load loading technology is broken through, the slurry is constrained at the same time, and extrusion and friction load are applied to the slurry; visual observation and force load test technologies are adopted, and the test process image and load parameters are tested. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0019] Figure 1 It is a structure schematic diagram of the extrusion friction safety property test device for the mixed composite solid propellant slurry of the present application embodiment;

[0020] Figure 2 It is an extrusion friction loading principle diagram

[0021] Figure 3 It is a structure schematic diagram of the extrusion loading component; (a) is an elevation view, and (b) is a sectional view;

[0022] Figure 4 It is a structure schematic diagram of the oil cylinder; (a) is an elevation view, and (b) is a sectional view;

[0023] Figure 5 It is a structure schematic diagram of the integrated sensor;

[0024] Figure 6 It is a structure schematic diagram of the assembly disc;

[0025] Figure 7 It is a structure schematic diagram of the barrel; (a) is an elevation view, and (b) is a sectional view;

[0026] Figure 8 It is a structure schematic diagram of the rotation loading component; (a) is an elevation view, and (b) is a sectional view;

[0027] Figure 9 It is a structure schematic diagram of the motor;

[0028] Figure 10 It is a structure schematic diagram of the shaft coupling;

[0029] Figure 11 It is a structure schematic diagram of the transmission shaft; (a) is an elevation view, and (b) is a sectional view;

[0030] Figure 12 This is a schematic diagram of the fixed cylinder structure;

[0031] Figure 13 This is a schematic diagram of the piston structure. Detailed Implementation

[0032] 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.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1:

[0035] like Figure 1 As shown, this embodiment of the invention provides a testing device for the extrusion friction safety characteristics of composite solid propellant slurry. From bottom to top, the device comprises a base, an operating platform, an integrated sensor, a barrel, a support column, a piston, and a motor. The base contains a hydraulic system for providing extrusion load; the motor provides rotation load, and an encoder is mounted above the motor to measure its rotational speed; the barrel and piston are in direct contact with the solid propellant slurry, with the barrel used to fill the slurry and the piston used to apply force load to the slurry; the integrated sensor measures torque and pressure, used to measure the torque and extrusion force experienced by the slurry during the test.

[0036] like Figure 2 As shown, solid propellant slurry is used as a test sample and is filled in a barrel. The hydraulic system in the base drives the pressure sensor and the barrel to move upward by applying pressure until the piston is inserted into the barrel. The piston contacts the slurry and squeezes it until the preset squeezing load is reached. At the same time, the motor starts and drives the piston to rotate through the transmission device, which finally realizes the squeezing and friction of the slurry.

[0037] By matching the inner diameter of the barrel with the outer diameter of the piston rod, the slurry can be effectively constrained, preventing it from overflowing from the gaps between the piston and the side wall of the barrel, and avoiding ignition caused by the overflowing slurry being squeezed and rubbed at the side wall.

[0038] like Figure 3 As shown in (a) and (b), the extrusion loading component of the test apparatus includes a hydraulic cylinder, an integrated sensor, an assembly plate, and a barrel, which enables the application of extrusion loads.

[0039] The oil cylinder is connected to the external hydraulic machine through the oil inlet and the oil outlet, and can push the transmission rod to move upward through hydraulic loading, and the upper end of the transmission rod is connected with the integrated sensor, the assembly disc and the material cylinder, so that the material cylinder is pushed to move upward, cooperates with the piston, and can realize the extrusion force on the medicine paste. In the application, the oil cylinder is the power source for providing the extrusion force load. As shown in Figure 4 (a) and (b), the two ends of the oil cylinder have an oil inlet and an oil outlet respectively for the inlet and outlet of hydraulic oil; the upper end has a transmission rod. The transmission rod is driven through the external connection of the hydraulic machine through the oil inlet and the oil outlet, and the driving of the transmission rod can be realized through hydraulic loading. The flow of the hydraulic oil is controlled to accurately control the movement and pressure of the transmission rod.

[0040] In the application, the integrated sensor is used to measure the torque and pressure. As shown in Figure 5 , the main body of the integrated sensor is a disc structure with a circular opening in the center and a plurality of assembly holes for connecting the transmission rod of the oil cylinder and the assembly disc. In the test process, when the sensor is subjected to torque or pressure load, the strain gauge inside the sensor will change in resistance due to deformation, and these changes are detected by the electronic circuit of the sensor and converted into an electric signal, so as to calculate the size of the acting torque or pressure. The torque and pressure load values of the medicine paste in the test process are monitored and recorded in real time.

[0041] In the application, as shown in Figure 6 , the main body of the assembly disc is a circular base for connecting the material cylinder and the integrated sensor, and the torque and pressure load of the medicine paste in the material cylinder can be transmitted to the integrated sensor through the assembly disc. The disc is distributed with grooves and a plurality of circular assembly holes, the assembly of the material cylinder is realized through the grooves, and the material cylinder is fixed on the integrated sensor through the assembly holes.

[0042] In the application, as shown in Figure 7 (a) and (b), the material cylinder is made of high-transparency high-strength glass material, and the structure is a cylindrical main body with an inner hole and a gap in the center, and the bottom is designed by an assembly block. The inner hole is used for filling the medicine paste, and the size of the inner hole is matched with the outer diameter of the piston rod; the gap is used for pressure relief to prevent the medicine paste from exploding due to excessive pressure, and the pressure can be discharged through the gap to avoid danger; the assembly block at the bottom can match the grooves of the assembly disc, so that the material cylinder is fixed on the assembly disc. Since the high-transparency high-strength glass material is used, the strength is ensured, and the high-speed camera and infrared camera can be used to monitor the flow process and temperature change process of the medicine paste in the test process.

[0043] As an embodiment of the application, the structure of the rotating loading component of the test device is as shown in Figure 8As shown in (a) and (b), it consists of a motor, coupling, fixed cylinder, drive shaft, piston, crossbeam, and support. The support and crossbeam are structural components, with the support mounted on the operating table to support the crossbeam; the crossbeam is located at the upper end of the component, providing space for the motor assembly.

[0044] An electric motor is a power source that provides rotational loads. It consists of a motor body, an encoder, and a shaft, such as... Figure 9 As shown. The main body of the electric motor consists of a rotor, stator, etc. The stator has three-phase symmetrical windings that generate a rotating magnetic field when energized. The rotor is composed of permanent magnets and rotates under the influence of the magnetic field. The three-phase stator coils are powered by a servo encoder control circuit, and the rotor is a permanent magnet type. The encoder is an important component of the electric motor, accurately measuring the rotor's direction of rotation, speed, and angle, and feeding this information back to the controller. The shaft is the rotating part of the motor, made of high-strength steel, and is used to transmit speed and torque. The shaft is the output part of the motor, responsible for transmitting the motor's rotational motion to other mechanical components. A coupling is usually installed at one end of the shaft for connection to the load equipment.

[0045] In this invention, such as Figure 10 As shown, a coupling is used to connect the motor shaft and the drive shaft. Its main purpose is to transmit power and torque, while allowing for certain axial, radial, and angular errors. It ensures that the motor's rotational motion is smoothly and efficiently transmitted to the drive shaft and piston, thereby achieving precise piston control.

[0046] In this invention, the transmission shaft structure is as follows: Figure 11 As shown in (a) and (b), the upper end is connected to the motor shaft, and the lower end is connected to the piston through a pin, thereby realizing the connection between the motor shaft and the piston, transmitting the rotational motion of the motor to the piston rod, thus realizing the rotational motion of the piston.

[0047] In this invention, the fixed cylinder structure is as follows: Figure 12 As shown, the fixed cylinder serves as a support and guide, ensuring the stability and accuracy of the transmission rod during rotation, preventing it from shifting or swaying during movement, thereby guaranteeing the operational accuracy and reliability of the entire testing device.

[0048] In this invention, the piston structure is as follows: Figure 13As shown, the upper half of the piston is thicker, and the lower half is thinner; the upper half is matched with the transmission shaft and has a through hole, which is connected with the assembly hole of the transmission shaft through a latch; the lower half is a piston column, the outer diameter of which is matched with the hole diameter of the inner hole of the barrel, and can be inserted into the inner hole of the barrel; the lower end surface of the piston column is a friction end surface, which is designed with a certain roughness, so as to realize effective friction on the medicinal paste. Through the matching of the piston and the barrel, the extrusion load is applied to the barrel by the oil cylinder, and the rotary load is applied to the piston by the motor, so that the medicinal paste in the inner hole of the barrel can be extruded and rubbed, and the purpose of the extrusion loading of the test device on the medicinal paste is achieved.

[0049] The physical quantity measurement of the extrusion and friction safety performance test of the composite solid propellant medicinal paste according to the present application is as follows:

[0050] (1) Torque / pressure measurement

[0051] Torque / pressure measurement is a key link in the present application for realizing accurate load control and data recording. By using an integrated sensor, the torque and pressure load suffered by the medicinal paste during extrusion and friction can be measured at the same time.

[0052] Measurement principle: The integrated sensor is designed based on the strain gauge principle. The strain gauge inside the sensor will deform when subjected to external force, causing the resistance value to change. By converting the resistance change into a voltage signal through a circuit, and then amplifying and analog-digital converting, the corresponding torque and pressure values are obtained.

[0053] Measurement process: During the test, the sensor is installed between the barrel and the piston to monitor the torque and pressure suffered by the medicinal paste in real time. When the hydraulic system applies extrusion force, the sensor records the pressure load; when the motor drives the piston to rotate, the sensor records the torque load. Through the data acquisition system, the measurement results are transmitted to the computer in real time for analysis and recording.

[0054] Technical advantages: The integrated sensor has high precision, high response speed and good repeatability, and can accurately measure the load change of the medicinal paste during the test, providing reliable experimental data for the study of the friction ignition characteristics of the medicinal paste.

[0055] (2) Rotation speed measurement

[0056] Rotation speed measurement is an important means to evaluate the relative motion state of the medicinal paste during friction, and by accurately measuring the rotation speed of the piston, the friction power can be accurately calculated.

[0057] Measurement principle: The present application connects a high-precision encoder with the motor shaft, and the encoder calculates the rotation speed of the shaft by detecting the rotation angle and time interval of the shaft. The encoder outputs the rotation speed information in the form of a pulse signal, which is converted into a digital signal by a signal processing circuit and then transmitted to the controller.

[0058] Measurement process: At the beginning of the test, the motor starts and drives the piston to rotate. The encoder monitors the rotational speed of the shaft in real time and transmits the data to the control system. Through the control system, the rotational speed is monitored and adjusted in real time to ensure the stability and accuracy of the rotational speed during the test.

[0059] Technical advantages: The use of high-precision encoders can achieve accurate measurement and real-time feedback of the rotational speed, with a measurement accuracy of ±0.1%. By precisely controlling the rotational speed, accurate adjustment of the friction power can be achieved, providing strong support for studying the ignition characteristics of the drug slurry under different friction conditions.

[0060] (3) Image observation

[0061] Image observation technology is used to observe the dynamic behavior of the drug slurry during the extrusion and friction process, including temperature changes, local ignition phenomena, etc., providing intuitive visual information for studying the ignition mechanism of the drug slurry.

[0062] Measurement principle: The invention is designed with a high-transparency and high-strength glass material cylinder, which can be combined with the high-speed camera and infrared thermal imager provided in the experiment to realize image observation. The high-speed camera is used to capture the macroscopic dynamic behavior of the drug slurry during the extrusion and friction process, such as flow, deformation and ignition phenomena; the infrared thermal imager is used to monitor the temperature distribution of the drug slurry in real time, and the temperature information is converted into image display through thermal imaging technology.

[0063] Measurement process: During the test, the high-speed camera and infrared thermal imager are started synchronously to observe the test area in real time. The image data collected by the image acquisition card is transmitted to the computer, and the image processing software is used to analyze and process the images to extract the dynamic behavior and temperature change information of the drug slurry.

[0064] Technical advantages: Image observation technology can provide intuitive image information of the drug slurry during the extrusion and friction process, combined with temperature monitoring, which can clearly observe the local ignition phenomenon and temperature change process of the drug slurry. Through image analysis, the ignition mechanism and influencing factors of the drug slurry can be further studied, providing important basis for optimizing test conditions and improving test safety.

[0065] The above-described embodiments are only descriptions of the preferred modes of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by those skilled in the art shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for testing the extrusion friction safety characteristics of a composite solid propellant grain, characterized in that, From bottom to top are base, operation table, integrated sensor, barrel, support, piston and motor; the base contains hydraulic system for providing extrusion load; the motor is used for providing rotation load, and an encoder is installed above the motor for measuring the rotation speed of the motor; the barrel and the piston are in direct contact with the solid propellant slurry, the barrel is used for loading the solid propellant slurry, and the piston is used for applying force load to the slurry; the integrated sensor can measure torque and pressure, and is used for measuring the torque and extrusion pressure of the slurry during the test process; The extrusion loading part of the test device comprises a cylinder, an integrated sensor, an assembly disc and a barrel, and can realize the application of extrusion load; the cylinder is connected with an external hydraulic machine through an oil inlet and an oil outlet, and can push the transmission rod upward through hydraulic loading, the upper end of the transmission rod is connected with the integrated sensor, the assembly disc and the barrel, thereby pushing the barrel upward, and cooperating with the piston to realize the application of extrusion pressure to the slurry; The barrel is made of high-transmittance and high-strength glass material, and has a cylindrical main body, an inner hole and a gap in the center, and an assembly block at the bottom; the inner hole is used for loading the slurry, and the size of the inner hole is matched with the outer diameter of the piston rod; the assembly block at the bottom can be matched with the groove of the assembly disc to fix the barrel on the assembly disc.

2. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 1, wherein The solid propellant slurry as a test sample is loaded in the barrel; the hydraulic system in the base drives the pressure sensor and the barrel upward through pressurization until the piston is inserted into the barrel, the piston is in contact with the slurry and extrusion occurs, until the preset extrusion load is reached; at the same time, the motor is started to drive the piston to rotate through the transmission device to realize the extrusion and friction of the slurry.

3. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 2, wherein The main body of the integrated sensor is a disc structure, and has a circular opening and a plurality of assembly holes in the center, which are used for connecting the transmission rod of the cylinder and the assembly disc.

4. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 3, wherein The main body of the assembly disc is a circular base for connecting the barrel and the integrated sensor, and the torque and pressure load of the slurry in the barrel can be transmitted to the integrated sensor through the assembly disc.

5. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 4, wherein The rotation loading part of the test device is composed of a motor, a shaft coupling, a fixed cylinder, a transmission shaft, a piston, a cross beam and a support; the support and the cross beam are structural parts, wherein the support is assembled on the operation table, and the cross beam is located at the upper end of the part.

6. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 5, wherein The motor is composed of a motor main body, an encoder and a rotating shaft; the shaft coupling is used for connecting the rotating shaft of the motor and the transmission shaft.

7. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 6, wherein The upper end of the transmission shaft is connected with the rotating shaft of the motor, and the lower end is connected with the piston through a pin, thereby realizing the connection of the rotating shaft of the motor and the piston, transmitting the rotation movement of the motor to the piston rod, and realizing the rotation movement of the piston.

8. The apparatus for testing the extrusion friction safety characteristics of a composite solid propellant grain of claim 7, wherein The upper half of the piston is thicker, and the lower half is thinner; the upper half is matched with the transmission shaft and has a through hole, and the upper half is connected with the assembly hole of the transmission shaft through a pin; the lower half is a piston column, the outer diameter of the piston column is matched with the hole diameter of the inner hole of the barrel, and the piston column can be inserted into the inner hole of the barrel; the lower end surface of the piston column is an extrusion and friction end surface.

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