Energy-containing material dynamic carrying flow powder feeding device based on acoustic resonance fluidization

Abstract

The invention provides an energetic material dynamic carrying flow powder feeding device based on acoustic resonance fluidization, which comprises a base, an acoustic vibration assembly is arranged on the base, and a closed particle container for placing material particles is arranged on the acoustic vibration assembly; a clamping mechanism is further arranged on the base, a first mounting hole is formed in the clamping mechanism in the vertical direction in a penetrating mode, a gas carrying pipe capable of moving up and down is arranged in the first mounting hole, and the lower portion of the gas carrying pipe extends into the particle container; the gas carrying pipe comprises an outer pipe and an inner pipe which are coaxially sleeved, and a sealed gas flow channel is formed between the outer pipe and the inner pipe; a carrier gas inlet communicated with the airflow channel is formed in the side wall of the upper portion of the outer pipe, a carrier gas outlet communicated with the airflow channel is formed in the side wall of the lower portion of the outer pipe, and a powder feeding inlet is formed in the bottom of the inner pipe. Based on the basic principle of acoustic resonance fluidization, the device can effectively avoid relatively strong collision, friction and extrusion between energetic particles and the wall surface of a container, a powder feeding pipeline and the like, and has the characteristics of high safety and high reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of energetic material combustion and energy release, and in particular relates to an acoustic resonance fluidized energetic material dynamic carrying flow powder feeding device. Background Art

[0002] Energetic particles such as RDX, octogen (HMX), hexanitrohexaazaisowurtzitane (CL-20), and metal particles such as aluminum (Al), magnesium (Mg), iron (Fe), and boron (B) usually burn and release energy in a particle state under the action of a dynamic carrying flow. Such energetic materials have the characteristics of violent ignition and combustion reaction, metastable lattice state, and high material hazard. They are prone to explosion and deflagration under mechanical effects such as collision, friction, and extrusion. It is difficult to test and obtain the accurate combustion and energy release characteristics of energetic materials using conventional characterization methods, and it is difficult to achieve reliable and accurate powder feeding control in a dynamic carrying flow.

[0003] The existing submicron particle fluidized powder feeding device applies the circulating fluidized bed principle to the dynamic carrying flow. Its defects are: the circulating fluidized bed has a complex structure, the particle flow path is long, the probability of collision, friction, extrusion, etc. is significantly higher, and components such as hoods and cutters are prone to blockage, posing a safety hazard and is not suitable for powder feeding of material particles in a dynamic carrying flow.

[0004] Existing pneumatic conveying devices suitable for trace powders use spiral powder feeders and rotary powder feeders to convey powder particles before the particles enter the dynamic carrying flow. This conveying structure will produce obvious extrusion, friction, shearing and other effects on the granular powder, significantly increasing the interaction between particles and between particles and mechanical devices. If it is applied to energetic materials, the probability and risk of deflagration and explosion will be greatly increased. It is also not suitable for powder feeding of energetic materials and other types of particles in dynamic carrying flows.

[0005] The lack of basic characteristics of energetic materials in the dynamic carrying flow process makes it difficult to conduct in-depth research and promote the application of the combustion energy release of energetic materials. Therefore, it is urgent to develop a reliable, safe and accurate powder feeding device suitable for energetic particles under the action of dynamic carrying flow, which can provide important support for the experimental research and application promotion of energetic materials. Summary of the invention

[0006] In view of the lack of relevant solutions in the prior art, the purpose of the present invention is to provide a dynamic carrying flow powder feeding device for energetic materials based on acoustic resonance fluidization, so as to solve the technical problem in the prior art that energetic materials are difficult to be fed reliably, safely and accurately in a dynamic carrying flow.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A device for dynamically carrying and feeding energetic materials based on acoustic resonance fluidization, comprising a base, an acoustic vibration component is arranged on the base, and a closed particle container for placing material particles is arranged on the acoustic vibration component;

[0009] The base is also provided with a clamping mechanism, and a first mounting hole is vertically provided on the clamping mechanism, a carrier gas pipe that can move up and down is provided in the first mounting hole, and the lower part of the carrier gas pipe extends into the interior of the particle container;

[0010] The carrier gas tube includes an outer tube and an inner tube which are coaxially sleeved, and a sealed airflow channel is formed between the outer tube and the inner tube; a carrier gas inlet connected to the airflow channel is opened on the upper side wall of the outer tube, and a carrier gas outlet connected to the airflow channel is opened on the lower side wall of the outer tube; a powder inlet is set at the bottom of the inner tube, and a powder outlet is set at the top of the inner tube; the powder inlet and the carrier gas outlet are both located in the particle container.

[0011] The present invention also has the following technical features:

[0012] Specifically, the acoustic vibration component includes an acoustic vibration platform, a plurality of springs are arranged between the acoustic vibration platform and the base, and an exciting vibrator is arranged on the acoustic vibration platform.

[0013] Furthermore, a bracket is provided on the base, a mounting plate is provided on the top of the bracket, a second mounting hole is provided on the mounting plate in the vertical direction, a connecting piece is provided in the second mounting hole, a third mounting hole is provided on the connecting piece in the vertical direction, a sealing ring is provided between the inner wall of the third mounting hole and the outer wall of the outer tube; the first mounting hole, the second mounting hole and the third mounting hole are coaxially connected.

[0014] Furthermore, the particle container includes a main body and a cover plate arranged on the top of the main body, a fourth mounting hole is opened on the cover plate, the fourth mounting hole is coaxially arranged with the first mounting hole, and the carrier gas pipe penetrates into the particle container through the fourth mounting hole.

[0015] Furthermore, a telescopic mechanism is arranged between the cover plate and the connecting member, and the telescopic mechanism includes a first connecting flange and a second connecting flange which are symmetrically arranged, an elastic member is arranged between the first connecting flange and the second connecting flange, the first connecting flange is connected to the cover plate, and the second connecting flange is connected to the connecting member.

[0016] Furthermore, the elastic member includes an outer wall capable of vertical expansion and contraction and an inner lining arranged in the outer wall.

[0017] Furthermore, the clamping mechanism includes a column, the column is provided with a cross bar that can move up and down along the column, and the front end of the cross bar is provided with the first mounting hole.

[0018] Furthermore, the resonance frequency generated by the acoustic resonance component is 10-100 Hz, and the distance between the powder feeding inlet and the upper surface of the material particles in the particle container is 5-20 mm.

[0019] Furthermore, a plurality of support rods are arranged on the acoustic vibration platform, and a pressing plate for pressing the particle container is fixedly mounted on the upright column.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] (1) The structural design of the device of the present invention is based on the principle of acoustic resonance fluidization. Acoustic resonance is used to convert solid particles into pseudo-fluids. Discrete solid particles are transported with the air flow through carrier gas, which can effectively avoid strong collision, friction and extrusion between energetic particles and container walls, powder feeding pipelines, particle layers, etc. The energetic particles are endowed with fluidization characteristics through acoustic resonance, and at the same time, the mixed material particles are evenly mixed. The device of the present invention can realize the safe, reliable, efficient and accurate powder feeding of energetic particles in a dynamic carrying flow.

[0022] (2) The device of the present invention realizes two operating modes of "surface fluidization" and "full-field fluidization" of solid particles in the particle container by adjusting parameters such as vibration frequency and amplitude, effectively solving problems such as the introduction of dynamic entrainment flow and powder feeding accuracy control, and further ensuring the stability and accuracy of energetic particle feeding while ensuring the safety and reliability of the overall device.

[0023] (3) The device of the present invention has a sophisticated structure, low cost, can operate safely and reliably for a long time, and has great application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the device of the present invention, wherein the arrow represents the direction of air flow;

[0025] Figure 2 It is a schematic diagram of the expansion joint structure in the present invention;

[0026] Figure 3 This is a schematic diagram of the principle of surface fluidization powder feeding in Example 1 of the present invention;

[0027] Figure 4 It is a schematic diagram of the principle of full-field fluidized powder feeding in Example 2 of the present invention.

[0028] Reference numerals:

[0029] 1-base, 2-acoustic vibration component, 3-particle container, 4-clamping mechanism, 5-carrier gas tube, 6-bracket, 7-mounting plate, 8-connecting piece, 9-sealing ring, 10-telescopic mechanism, 11-stepping motor, 12-support rod, 13-pressing plate; 201-acoustic vibration platform, 202-spring, 203-excitation vibrator; 301-body, 302-cover plate; 401-column, 402-cross bar; 501-outer tube, 502-inner tube, 503-carrier gas inlet, 504-carrier gas outlet, 505-powder inlet, 506-powder outlet; 1001-first connecting flange, 1002-second connecting flange, 1003-elastic piece; 10031-outer wall, 10032-inner lining.

[0030] The technical solution of the present invention is further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0031] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0032] The dynamic entrainment flow in the present invention refers to a continuously flowing gas that can carry energetic material particles.

[0033] The inventive concept of the present invention is: using acoustic resonance fluidization to reduce the degree of collision between energetic particles and the container wall, powder feeding pipeline, etc., to improve safety, and achieving different fluidization effects by adjusting the vibration frequency and amplitude, and cooperating with carrier gas transportation to achieve stable and accurate powder feeding, and the acoustic resonance fluidization method also has a uniform mixing effect, thereby avoiding the influence of energetic particles agglomeration due to vibration on the stability and accuracy of powder feeding, etc.; using a flexible structure expansion joint for connection, stably controlling the stroke of the powder feeding pipeline, and introducing a carrier gas of appropriate pressure into the container, etc., further ensures the safety, reliability, stability and accuracy of the device of the present invention.

[0034] The materials in the present invention include energetic particles (such as RDX, HMX, CL-20, TKX-50, AP, etc.), metal particles (such as Al, Mg, Fe, B, etc.) and composite materials with energetic particles or metal particles as the main body.

[0035] It should be emphasized that, unless otherwise specified, the components used in the present invention are all commercially available.

[0036] Example 1

[0037] Following the above technical solution, Figure 1 Shown and Figure 2The present embodiment provides a device for dynamically carrying and feeding energetic materials based on acoustic resonance fluidization, comprising a base 1, on which is disposed an acoustic vibration component 2, on which is disposed a closed particle container 3 for placing material particles; the acoustic vibration component 2 is used to drive the particle container 3 to perform ultrasonic vibration, so that the energetic material placed in the particle container 3 vibrates, presenting a state of "surface fluidization" and "full-field fluidization". When the vibration frequency of the material particles inside the particle container 3 is relatively low (10 to 35 kHz), the material particles present surface fluidization, and the amplitude is 0.1 to 5 mm; when the vibration frequency of the material particles inside the particle container 3 is relatively high (25 to 100 kHz), the material particles present full-field vibration, and the particle vibration amplitude can reach 5 to 50 mm.

[0038] A clamping mechanism 4 is also provided on the base 1, and a first mounting hole is vertically provided on the clamping mechanism 4. A gas carrier tube 5 that can move up and down is provided in the first mounting hole, and the lower part of the gas carrier tube 5 extends into the particle container 3; preferably, the speed of the gas carrier tube 5 moving up and down is 1mm / s~1mm / min.

[0039] The carrier gas pipe 5 comprises an outer tube 501 and an inner tube 502 which are coaxially sleeved, and a sealed airflow channel is formed between the outer tube 501 and the inner tube 502; a carrier gas inlet 503 communicating with the airflow channel is provided on the upper side wall of the outer tube 501, a carrier gas outlet 504 communicating with the airflow channel is provided on the lower side wall of the outer tube 501, a powder feeding inlet 505 is provided at the bottom of the inner tube 502, and a powder feeding outlet 506 is provided at the top of the inner tube 502; the powder feeding inlet 505 and the carrier gas outlet 504 are both located inside the particle container 3, and the carrier gas inlet 503 and the powder feeding outlet 506 are both outside the particle container 3. The carrier gas inlet 505 is connected to a gas source, and the carrier gas entering the airflow channel through the carrier gas inlet 505 enters the particle container 3 through the carrier gas outlet 504, and then forms a diffusion gas carrying material particles, and the diffusion gas is then discharged through the powder feeding outlet 506.

[0040] As a preferred solution of this embodiment, the acoustic vibration component 2 includes an acoustic vibration platform 201, a plurality of springs 202 are arranged between the acoustic vibration platform 201 and the base 1, and an exciting vibrator 203 is arranged on the acoustic vibration platform 201. The particle container 3 is placed on the acoustic vibration platform 201.

[0041] As a preferred solution of this embodiment, a bracket 6 is further provided on the base 1, a mounting plate 7 is provided on the top of the bracket 6, a second mounting hole is provided on the mounting plate 7 along the vertical direction, a connecting member 8 is provided in the second mounting hole, a third mounting hole is provided on the connecting member 8 along the vertical direction, a sealing ring 9 is provided between the inner wall of the third mounting hole and the outer wall of the outer tube 501; the first mounting hole, the second mounting hole and the third mounting hole are coaxially connected. The carrier gas pipe 5 passes through the first mounting hole, the second mounting hole and the third mounting hole.

[0042] As a preferred solution of this embodiment, the particle container 3 includes a main body 301 and a cover plate 302 arranged on the top of the main body, and a fourth mounting hole is opened on the cover plate 302. The fourth mounting hole is coaxially arranged with the first mounting hole, and the gas carrier tube 5 penetrates into the particle container 3 through the fourth mounting hole.

[0043] As a preferred solution of this embodiment, a telescopic mechanism 10 is provided between the cover plate 302 and the connecting member 8, and the telescopic mechanism 10 includes a first connecting flange 1001 and a second connecting flange 1002 which are symmetrically arranged, and an elastic member 1003 is provided between the first connecting flange 1001 and the second connecting flange 1002, and the first connecting flange 1001 is connected to the cover plate 302, and the second connecting flange 1002 is connected to the connecting member 8. The telescopic mechanism 10 is used to ensure a flexible transition between the particle container 3 which has acoustic resonance and the connecting member 8 when the device is running, and to ensure the pressure bearing and sealing of the particle container 3.

[0044] As a preferred solution of this embodiment, the elastic member 1003 includes an outer wall 10031 that can be stretched vertically and an inner lining 100302 disposed in the outer wall 10031. In this embodiment, the outer wall 10031 is connected in a woven manner using stainless steel hinges, and the whole is flexible and bendable to ensure that it can be freely stretched and retracted during pressure resistance and high-frequency vibration, and the inner lining is a PVDF film lining.

[0045] As a preferred solution of this embodiment, the clamping mechanism 4 includes a column 401 , on which a crossbar 402 capable of moving up and down along the column 401 is disposed, and a first mounting hole is disposed at the front end of the crossbar 402 .

[0046] As a preferred solution of this embodiment, the resonance frequency generated by the acoustic resonance component 2 is 10-100 Hz, and the distance between the powder feeding inlet 505 and the upper surface of the material particles in the particle container 3 is 5-20 mm.

[0047] As a preferred solution of this embodiment, a plurality of support rods 12 are further provided on the acoustic vibration platform 201 , and a pressing plate 13 for pressing the particle container 3 is fixedly mounted on the support rods 12 .

[0048] As a preferred solution of this embodiment, a stepping motor 11 for driving the crossbar to move is also provided on the base 1.

[0049] The present invention, when used, comprises the following steps:

[0050] Step 1: Place the particle container 3 containing material particles on the acoustic vibration platform 201. Figure 1 The installation of the completed device is shown;

[0051] Step 2: setting the vibration frequency of the exciting vibrator 203 according to the natural resonance frequency of the material particles, and starting the exciting vibrator 203. Due to the resonance effect, when the vibration frequency of the exciting vibrator 203 is close to the natural resonance frequency of the particles, the small amplitude of the exciting vibrator 203 can cause a larger amplitude of the particles, thereby fluidizing the energetic material particles in the particle container 3;

[0052] Step 3, adjusting the distance between the carrier gas outlet 504 and the upper surface of the particle layer;

[0053] Step 4: Feed carrier gas into the particle container 3 via the carrier gas pipe 5, and stably output highly discrete material particles through the powder supply outlet 506.

[0054] Application Example 1

[0055] In this application example, a certain amount of energetic composite material particles with HMX as the main component are placed in the particle container 3, such as Figure 3 As shown, the vibration frequency of the exciting vibrator 203 is set to 16kHz, so that the amplitude of the energetic composite material is roughly maintained in the range of 3 to 4mm, and the operating state of "surface fluidization" is presented; the position of the carrier gas tube 5 is adjusted so that its lower end is located at the upper end of the particle fluidization layer, and the distance between the lower end surface of the carrier gas tube 5 and the upper surface of the particle fluidization layer is maintained at about 5mm; the carrier gas inlet 503 is connected to the nitrogen gas cylinder, and the control valve of the nitrogen gas cylinder is adjusted so that the powder outlet 506 has airflow and carries a trace of solid powder; the speed of the stepper motor 11 is controlled so that the crossbar 402 drives the carrier gas tube 5 to move downward at a linear speed of 1mm / min. As the carrier gas tube 5 gradually moves downward, the powder outlet 506 stably outputs highly discrete energetic composite solid particles.

[0056] The powder feeding outlet 506 can be connected to test devices such as a flat flame burner and a vertical settling furnace, and the combustion properties of the energetic material such as the ignition delay time and the combustion temperature can be tested with the help of the connected test devices.

[0057] Application Example 2

[0058] In this application example, a certain amount of aluminum-based composite material with aluminum (Al) as the main component is placed in the particle container 3. Figure 4 As shown, when the vibration frequency of the exciting vibrator 3 is set to 35kHz, the aluminum-based composite material presents a "full-field fluidization" operating state, and the amplitude is about 20mm. Finally, the energetic composite material is stably output at the powder feeding outlet 506. After testing, the particle mass flow rate is about 6.3g / min.

[0059] In summary, the present invention is based on the principle of acoustic resonance fluidization, utilizes acoustic resonance to convert solid particles into pseudo-fluids, and endows energetic particles with fluidization characteristics through acoustic resonance. Discrete solid particles are transported with the airflow through carrier gas transportation. Compared with the pneumatic transportation method of traditional spiral powder feeding combined with airflow and the precise powder feeding method based on the fluidized bed principle, the device of the present invention can effectively avoid strong collision, friction and extrusion between energetic particles and container walls, powder feeding pipelines, particle layers, etc., and at the same time has a uniform mixing effect on the mixed material particles; the device of the present invention can realize safe, reliable, efficient and accurate powder feeding of energetic particles in a dynamic carrying flow.

[0060] The specific embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical scheme of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

Claims

1. A device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization, comprising a base (1), characterized in that: The base (1) is provided with an acoustic vibration component (2), and the acoustic vibration component (2) is provided with a closed particle container (3) for placing material particles; The base (1) is also provided with a clamping mechanism (4), the clamping mechanism (4) is provided with a first mounting hole extending vertically therethrough, a gas carrier tube (5) capable of moving up and down is provided in the first mounting hole, and the lower part of the gas carrier tube (5) extends into the interior of the particle container (3); The carrier gas tube (5) comprises an outer tube (501) and an inner tube (502) which are coaxially sleeved, and a sealed airflow channel is formed between the outer tube (501) and the inner tube (502); a carrier gas inlet (503) which is connected to the airflow channel is provided on the upper side wall of the outer tube (501), and a carrier gas outlet (504) which is connected to the airflow channel is provided on the lower side wall of the outer tube (501); a powder inlet (505) is provided at the bottom of the inner tube (502), and a powder outlet (506) is provided at the top of the inner tube (502); the powder inlet (505) and the carrier gas outlet (504) are both located in the particle container (3).

2. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 1, characterized in that: The acoustic vibration component (2) comprises an acoustic vibration platform (201), a plurality of springs (202) are arranged between the acoustic vibration platform (201) and the base (1), and an exciting vibrator (203) is arranged on the acoustic vibration platform (201).

3. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 1, characterized in that: The base (1) is also provided with a bracket (6), the top of the bracket (6) is provided with a mounting plate (7), a second mounting hole is provided on the mounting plate (7) in a vertical direction, a connecting piece (8) is provided in the second mounting hole, a third mounting hole is provided on the connecting piece (8) in a vertical direction, a sealing ring (9) is provided between the inner wall of the third mounting hole and the outer wall of the outer tube (501); the first mounting hole, the second mounting hole and the third mounting hole are coaxially connected.

4. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 3, characterized in that: The particle container (3) comprises a main body (301) and a cover plate (302) arranged on the top of the main body, a fourth mounting hole is opened on the cover plate (302), the fourth mounting hole is coaxially arranged with the first mounting hole, and the gas carrier tube (5) penetrates into the particle container (3) through the fourth mounting hole.

5. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 4, characterized in that: A telescopic mechanism (10) is arranged between the cover plate (302) and the connecting member (8), and the telescopic mechanism (10) comprises a first connecting flange (1001) and a second connecting flange (1002) which are symmetrically arranged, and an elastic member (1003) is arranged between the first connecting flange (1001) and the second connecting flange (1002), and the first connecting flange (1001) is connected to the cover plate (302), and the second connecting flange (1002) is connected to the connecting member (8).

6. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 5, characterized in that: The elastic member (1003) comprises an outer wall (10031) capable of vertical expansion and contraction and an inner lining (100302) disposed within the outer wall (10031).

7. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 1, characterized in that: The clamping mechanism (4) comprises a column (401), on which a crossbar (402) capable of moving up and down along the column (401) is arranged, and the front end of the crossbar (402) is provided with the first mounting hole.

8. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 1, characterized in that: The resonance frequency generated by the acoustic resonance component (2) is 10 to 100 Hz, and the distance between the powder feeding inlet (505) and the upper surface of the material particles in the particle container (3) is 5 to 20 mm.

9. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 1, characterized in that: A plurality of support rods (12) are also provided on the acoustic vibration platform (201), and a pressing plate (13) for pressing the particle container (3) is fixedly mounted on the support rods (12).

10. The device for dynamically carrying energetic materials and feeding powder based on acoustic resonance fluidization according to claim 1, characterized in that: The base (1) is also provided with a stepping motor (11) for driving the crossbar to move.

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