Acoustic resonance-based high-safety mixing device for high-solid-content energetic material

Abstract

The invention relates to the technical field of energetic material mixing, and particularly provides a high-solid-content energetic material high-safety mixing device based on acoustic resonance. The device is formed by connecting a plurality of groups of peristaltic pump units in series through a flexible communication pipeline, a 20-100kHz micro acoustic resonance module is embedded in a peristaltic pump roller, and the apparent viscosity of an energetic material is remarkably reduced by breaking the adhesive force among particles through high-frequency vibration; in cooperation with a rotor-stator type high-shear homogenizer, relay conveying and deep homogenization of materials with the solid content larger than or equal to 85% are achieved; an original dual-mode control system supports'direct output mode 'efficient conveying and'circulating mode' mixing / temperature control technology, so that the mixing uniformity is within + / -2%; multiple sealing protection is combined with real-time safety monitoring, the explosion risk caused by local overheating and static electricity accumulation is avoided, the conveying efficiency is improved by 20%-30%, the particle integrity is kept at 98%, and the high-risk explosive conveying device is suitable for military ammunition, civil blasting and other high-risk scenes.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of energetic material flow, in particular to a high-safety mixing device for high-solid-content energetic materials based on acoustic resonance. BACKGROUND

[0002] High-solid-content energetic materials have important applications in many fields, such as military ammunition manufacturing and civil blasting engineering. However, the physical properties of such materials are complex, and they are often viscous or granular, with a solid content of up to 80%-90%, which leads to poor flowability. Traditional conveying methods are prone to blockage, affecting production efficiency. At the same time, energetic materials are highly sensitive and can easily catch fire or explode due to factors such as mechanical friction, static electricity or local overheating, causing serious safety accidents.

[0003] However, traditional piston pumps and gear pumps are prone to local high pressure and strong shear, which exacerbates the risk of material blockage and is highly destructive to the materials, making it difficult to meet the needs of safe flow conveying. The control precision is poor, and the flow regulation is not sensitive, making it difficult to meet the precise proportioning requirements. SUMMARY

[0004] The application provides a high-safety mixing device for high-solid-content energetic materials based on acoustic resonance, which solves the problems of uneven mixing, high risk of flow blockage, poor safety and inaccurate flow control during the conveying of high-solid-content and high-risk energetic materials in the prior art.

[0005] The technical solution of the application is as follows: a high-safety mixing device for high-solid-content energetic materials based on acoustic resonance, which is composed of multiple peristaltic pump units, connecting pipelines, a control system, a sealing protection device, an acoustic resonance device and a high-shear homogenizer. Each peristaltic pump unit comprises a driver, a pump head and a specially designed elastic hose that is resistant to high pressure, corrosion and wear. The rollers of the pump head are embedded with a miniature acoustic resonance module, which is composed of a high-frequency vibration generator (frequency range 20-100 kHz) and a flexible transmission component. The multiple peristaltic pump units are connected to each other through connecting pipelines to form an organic whole, thereby reducing the working pressure of the pump. The connecting pipelines are made of special materials and have good flexibility and sealing performance, which can adapt to the characteristics of the energetic materials and prevent leakage. The high-shear homogenizer is installed on the connecting pipeline and can efficiently homogenize the energetic materials, further improving the mixing uniformity of the materials. The device is also provided with a circulating pipeline switching system, including a three-way reversing valve (installed in the connecting pipeline between the last peristaltic pump unit and the discharge tank) and a circulating pipeline (connecting the outlet of the three-way reversing valve and the inlet of the feed tank); the control system is additionally provided with a "circulation mode" and a "direct discharge mode" switching function.

[0006] Working principle: After the system is started, the control system drives the drivers of each peristaltic pump unit to operate according to the preset conveying parameters, and the rollers embedded with micro acoustic resonance modules start to rotate. The rollers successively extrude the elastic hose, so that a series of "pillow" fluid spaces are formed in the hose. The high-frequency sound waves generated by the high-frequency vibration generator are transmitted to the elastic hose through the rollers, forming periodic resonance in the energetic material, destroying the adhesion between particles and the cohesive structure, reducing the apparent viscosity, and at the same time removing the material particles adhering to the inner wall of the hose. Under the continuous extrusion of the rollers, the energetic material is pushed forward in the elastic hose. When the energetic material is conveyed in the connecting pipeline, it passes through the high-shear homogenizer. The high-shear homogenizer further refines and mixes the energetic material through the strong shear, collision, cavitation and other actions between the high-speed rotating rotor and stator, and improves the uniformity of the material. At the same time, the sealing protection device ensures that the whole conveying process is in a closed and safe environment, preventing the energetic material from contacting the outside world and causing danger. The device has two operating modes. The direct discharge mode can meet the high-efficiency conveying demand, and the circulating operation mode supports mixing, temperature control and other processes.

[0007] Compared with the prior art, the present application has the following advantages:

[0008] (1) The present application adopts a multi-pump cooperative connection technology, multiple peristaltic pump units work cooperatively, and the relay conveying of the energetic material is realized through the connecting pipeline, which increases the flow power, improves the flow ability of high solid content materials, and at the same time, disperses the working pressure of a single pump and reduces the risk of equipment failure.

[0009] (2) The present application uses a sealing protection and safety monitoring system, adopts a multiple sealing structure to ensure that the energetic material is completely closed during the flow process and prevent leakage. At the same time, the safety monitoring system is equipped to monitor the pressure, temperature, flow and other parameters in real time. Once an abnormal situation occurs, the control system immediately starts emergency measures such as stopping the operation of the pump and starting the pressure relief device, to ensure the safety of the flow process.

[0010] (3) The present application can accurately adjust the speed and running time of each peristaltic pump unit through the control system according to the actual demand, so as to realize the accurate control of the conveying amount of the energetic material and meet the strict requirements of different production processes on the conveying amount.

[0011] (4) The present application reduces the internal friction resistance of the energetic material through high-frequency vibration, so that the conveying efficiency of the material with a solid content of 85% or more is improved by 20%-30%, and the mechanical crushing of the material particles by the roller extrusion is reduced, and the particle integrity retention rate is improved from 92% to 98%. The vibration action can remove the material adhesion on the inner wall of the hose, avoid the risk of local overheating or degradation caused by the traditional peristaltic pump due to stagnation, and prolong the maintenance period by more than 50%.

[0012] (5) The present application adopts double modes, the straight-out mode meets high-efficiency conveying, and the circulation mode supports mixing, temperature control and other processes, and the uniformity is improved to within ±2%.

[0013] Patent drawing

[0014] Figure 1 A schematic diagram of a peristaltic pump circulation mode device is shown;

[0015] Figure 2 A schematic diagram of a peristaltic pump straight-out mode device is shown;

[0016] Figure 3 A schematic diagram of a high-shear homogenizer is shown;

[0017] Figure 4 A schematic diagram of a sound resonance device is shown. DETAILED DESCRIPTION

[0018] The peristaltic pump device for mixing high-solid-content high-risk energetic materials described in the present application is described in detail below in combination with the drawings and specific implementation scenarios, so that the operation and implementation of the technical solution of the present application in practical application can be more clearly understood.

[0019] As shown in the figure, the present embodiment is a peristaltic pump device integrated with acoustic resonance device and dual-mode switching system, the components include: 1. Pump housing, 2. Driver, 3. Acoustic resonance module, 4. Elastic hose, 5. Changeover valve (three-way changeover valve), 6. Sealing ring, 7. Feed tank, 8. High shear homogenizer, 9. Connection pipeline, 10. Roller (embedded acoustic resonance module 3), 11. Circulation pipeline, 12. Discharge tank, 13. Sensor, 14. Rotor. The implementation process is as follows: in the implementation process, the energetic material is added through the feed tank 7, the driver 2 drives the rotor 14 to rotate the roller 10 in the pump head, the roller 10 embedded with the acoustic resonance module 3 extrudes the elastic hose 4 while releasing high-frequency vibration of 20-100 kHz, so that a "pillow" shaped fluid space and a periodic resonance field are formed in the hose. Under the synergistic action of the negative pressure generated by the roller extrusion and the acoustic wave vibration, the energetic material is sucked into the hose 4 and pushed forward in sections, the vibration energy breaks the interparticle adhesion, reduces the apparent viscosity and removes the attachments on the inner wall of the hose. Multiple peristaltic pump units are connected in series through the connection pipeline 9, and the material is transferred between the units by indirect force; when the circulation process is needed, the changeover valve 5 is switched to the circulation pipeline 11 passage, and the material forms a closed loop through "feed tank 7 → peristaltic pump → connection pipeline 9 → changeover valve 5 → circulation pipeline 11 → feed tank 7", realizing mixing, temperature control or pressure sharing. When the energetic material is transported in the connection pipeline 9, it will pass through the high shear homogenizer 8, which shears, grinds and mixes the energetic material through the interaction between the high-speed rotating rotor and stator, making it more uniform. The sealing ring 6 ensures the full-process sealing of the interfaces of the pump housing 1, the connection pipeline 9 and the circulation pipeline 11, and the sensor 13 (pressure / temperature / flow / vibration) monitors the key parameters in real time to ensure safety.

[0020] According to the design layout, the multiple peristaltic pump units are fixedly installed on a stable support or working platform. Ensure that the installation position of each peristaltic pump unit is convenient for subsequent maintenance, repair and connection of the connection pipeline. During installation, ensure that the roller of the pump head rotates flexibly without jamming, and at the same time, correctly connect the driver with the external power supply and control system, perform preliminary power-on test, and check whether the driver is operating normally.

[0021] According to the specifications of the peristaltic pump unit, select a specially designed high-pressure-resistant, corrosion-resistant and wear-resistant elastic hose. The elastic hose is accurately embedded in the pump head of the peristaltic pump unit to ensure that the hose is in close and uniform contact with the roller of the pump head. During installation, avoid excessive stretching, twisting or sharp object scratching of the hose to prevent damage to the sealing performance and mechanical properties of the hose. A miniature vibration generator is embedded in the center shaft of the roller, which is rigidly connected to the outer ring of the roller through a silica gel conductive sheet, and the wire is connected to the control system through the shielded wire inside the pump housing. The interface is treated with explosion-proof sealing glue to ensure that the vibration energy transmission efficiency is ≥90%.

[0022] The connecting pipes made of special materials are used to connect the peristaltic pump units in sequence. During the connection process, sealing flanges, sealing rings and other sealing accessories are used to ensure the sealing of the pipe connection. For the bending or turning parts, the flexibility of the connecting pipes should be ensured to avoid sharp bends or dead folds, so as to reduce the flow resistance of the energetic materials during the conveying process. At the same time, according to the actual conveying path and layout, the connecting pipes are reasonably fixed to prevent them from loosening or shifting due to vibration and other factors during operation.

[0023] A sealed protective device is installed around the entire connecting peristaltic pump device. The sealed protective device can use a fully enclosed metal shell or a corrosion-resistant engineering plastic shell, and the splicing of the shell is sealed with multiple sealing structures such as rubber sealing rings and sealing rubber strips. An observation window is provided on the protective device to allow the operator to observe the running status of the device in real time. At the same time, various sensors of the safety monitoring system, such as pressure sensors, temperature sensors and flow sensors, are installed at key positions of the device, such as the flexible hose, the connecting pipe and the inlet and outlet of the peristaltic pump unit, to ensure that the sensors can accurately monitor various parameters during the conveying process.

[0024] Before formal conveying of high-solid high-risk energetic materials, check all parts of the device to ensure that the sealed protective device is intact, and the flexible hose and the connecting pipe are not damaged or blocked. The energetic material storage container is connected to the inlet of the connecting peristaltic pump device through a sealed pipe to ensure firm connection and good sealing.

[0025] Start the connecting peristaltic pump device through the control system, and according to the preset parameters, the drivers of each peristaltic pump unit start to operate, driving the pump head rollers to extrude the flexible hose and push the energetic materials to flow in the hose and the connecting pipe. During the conveying process, the operator should observe the display interface of the control system in real time to monitor the changes of the pressure, temperature, flow and other parameters to ensure that all parameters are within the normal range.

[0026] According to the requirements of the production process, if the conveying amount of the energetic materials needs to be adjusted, the speed and running time of each peristaltic pump unit can be accurately adjusted through the control system. For example, when the conveying amount needs to be increased, the speed of the peristaltic pump unit can be appropriately increased or the running time can be prolonged; when the conveying amount needs to be reduced, the speed can be reduced or the running time can be shortened. During the adjustment process, the running status of the device should be closely observed to avoid equipment failure or safety accidents caused by improper parameter adjustment.

[0027] Taking the mixing of a certain type of high-solid explosive (solid content 85%, particle size 0.1-2mm) with other additives as an example:

[0028] I. Equipment selection and parameter setting

[0029] 1. Peristaltic pump unit: Select a peristaltic pump with an inner diameter of 8 mm, a single pump speed range of 0-150 rpm, a maximum flow rate of 1.5 L / min, and be equipped with 4 peristaltic pump units + acoustic resonance module (embedded in the roller, frequency 20-100 kHz, amplitude 0-10 μm). Acoustic resonance module parameters: initial frequency 30 kHz, amplitude 5 μm (corresponding to a reduction of about 15% in material viscosity), linked to the speed of the peristaltic pump for adjustment.

[0030] 2. Connecting pipeline: Use a special flexible material pipeline with an inner diameter of 10 mm, a pipeline wall thickness of 3 mm, and a bending radius of not less than 30 cm to ensure smooth delivery of energetic materials.

[0031] 3. Initial parameter setting: According to the characteristics of energetic materials and the delivery requirements, set the initial speed of a single peristaltic pump to 40 rpm, at which the flow rate of a single pump is about 0.5 L / min, and the overall flow rate of the system is about 3 L / min, to meet the basic delivery requirements of the production process.

[0032] II. Safety settings

[0033] 1. Safety threshold setting: The oxygen content in the system is monitored in real time by a gas sensor and controlled below 2%; the upper limit of the pipeline pressure is set to 0.3 MPa, and the temperature monitoring range is 15-35°C, to avoid dangerous reactions of energetic materials caused by abnormal pressure and temperature.

[0034] 2. Explosion-proof measures: All electrical components in the device are explosion-proof, and an electrostatic discharge device is installed to discharge static electricity generated during equipment operation in a timely manner to prevent the accumulation of static electricity causing energetic material explosions.

[0035] III. Operation monitoring

[0036] 1. Data acquisition: Collect flow rate, pressure, and temperature data of each peristaltic pump unit every 10 seconds, real-time curves of roller vibration amplitude and energy density, as well as pressure and temperature data in the connecting pipeline, to ensure real-time monitoring of the device operation status.

[0037] 2. Automatic adjustment mechanism: When the flow deviation of a peristaltic pump unit exceeds ±3%, the control system automatically analyzes and adjusts the speed of the pump and adjacent pumps for compensation, with a compensation accuracy of ±0.5 rpm, to ensure the stability of energetic material delivery.

[0038] 3. Emergency handling: If the pipeline pressure reaches 0.28 MPa, the system will immediately issue an audible and visual alarm, and reduce the speed of all peristaltic pumps by 15 rpm; if the pressure continues to rise to 0.3 MPa, all peristaltic pumps will be instantly stopped, and a rapid pressure relief valve will be activated to reduce the pipeline pressure to a safe range within 5 seconds.

[0039] IV. Delivery effect detection

[0040] 1. Delivery efficiency detection: A flow monitoring device is installed at the outlet of the device. The actual delivery volume is counted once an hour, and the ratio of the actual delivery volume to the theoretical delivery volume is calculated. When the ratio is lower than 95%, the system automatically analyzes the cause and determines whether there is a pipe blockage, pump performance degradation, etc. and sends a prompt message.

[0041] 2. Material integrity detection: Samples are taken from the elastic hose and connecting pipeline every 4 hours. The particle morphology of the energetic material is observed under a microscope to detect whether the material structure is damaged due to factors such as extrusion and friction during the delivery process, ensuring that the material performance is not affected.

Claims

1. A high-safety mixing device for high-solids-content energetic materials based on acoustic resonance, characterized in that, The system includes a pump housing (1), a driver (2), an acoustic resonance module (3), an elastic hose (4), a reversing valve (5), a sealing ring (6), a feed tank (7), a high-shear homogenizer (8), a connecting pipe (9), a roller (10), a circulation pipe (11), a discharge tank (12), a sensor (13), and a rotor (14). The feed tank (7) is connected to the feed end of the device through a pipe. The driver (2) is installed on the pump housing (1). The rotor (14) is connected to the driver (2) and drives the roller (10) to rotate. The acoustic resonance module (3) is embedded in the roller (10). 0), the flexible hose (4) is installed inside the pump head and contacts the roller (10); multiple peristaltic pump units are connected by a connecting pipe (9), and a high-shear homogenizer (8) is installed on the connecting pipe (9); the reversing valve (5) is installed in the connecting pipe (9) between the last peristaltic pump unit and the discharge tank (12), and the circulation pipe (11) connects the outlet of the reversing valve (5) and the inlet of the feed tank (7); the sealing ring (6) is set at the interface of the pump casing (1), the connecting pipe (9), and the circulation pipe (11); the sensor (13) is installed in the key parts for monitoring parameters.

2. The high-safety integrated mixing and flow device according to claim 1, characterized in that, The acoustic resonance module (3) is a high-frequency vibration generator with a frequency range of 20-100kHz and an amplitude of 0-10μm. It is rigidly connected to the outer ring of the roller (10) through a silicone conductive sheet. The wires are connected to the control system through the shielded wire inside the pump casing (1). The interface is treated with explosion-proof sealant. The elastic hose (4) is a specially made high-pressure resistant, corrosion resistant, and wear resistant hose with an inner diameter of 8mm. It forms a "pillow" shaped fluid space with the roller (10). The high-shear homogenizer (8) is equipped with a high-speed rotating rotor and stator. Through strong shearing and collision, the high-shear homogenizer generates high-speed vibrations. Cavitation is used to treat energetic materials; the sensor (13) includes a pressure sensor, a temperature sensor, a flow sensor and a gas sensor, which are used to monitor pressure, temperature, flow and oxygen content respectively. The oxygen content is controlled below 2%, the upper limit of the pressure in the pipeline is set to 0.3MPa, and the temperature monitoring range is 15℃-35℃; the control system has the function of switching between "circulation mode" and "direct output mode". When the flow deviation of a certain peristaltic pump unit exceeds ±3%, the speed of the pump and the adjacent pumps is automatically adjusted for compensation. The compensation accuracy is ±0.5rpm.

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