Reverse-gas spiral powder feeding device and double-circulation collision system and method based on reverse-gas spiral powder feeding device

Abstract

The invention discloses a reverse-gas spiral powder feeding device and a double-circulation collision system and method based on the reverse-gas spiral powder feeding device, and belongs to the field of material preparation. The reverse-gas spiral powder feeding device at least comprises but not limited to a particle separation device, a secondary circulation pipe and a spiral powder feeding mechanism; the particle separation device is provided with a plurality of outlets according to different particle sizes, and at least comprises a fine particle outlet, a coarse particle outlet and a product particle outlet; the coarse particle outlet is connected with the feeding end of the spiral powder feeding mechanism; the fine particle outlet is connected with an existing particle collision circulating pipeline; the discharging end of the spiral powder feeding mechanism extends into an existing particle collision circulating pipeline. The collision speed of the mixed target collision powder is increased, the collision energy is improved, and the problems that the speed difference of the mixed target collision powder is low, and the collision effect is poor are solved.

Description

Technical Field

[0001] The invention relates to the field of material preparation, and in particular to a reverse air spiral powder feeding device and a double-circulation collision system and method based on the device. Background Art

[0002] Low-heat solid-phase reaction synthesis technology is a new material preparation technology that has developed rapidly in recent years. Its essential feature lies in energy transfer at room temperature or low temperature, that is, mechanical energy is introduced into the powdered reactant system through mechanical grinding and other methods, and converted into chemical energy of the reaction system, thereby achieving solid-phase synthesis at room temperature.

[0003] From the perspective of material preparation technology, the necessary condition for achieving low-heat solid-phase synthesis reaction is to introduce mechanical energy into the system to induce the reaction. At present, supersonic airflow acceleration technology is a technology that is widely used. The basic principle of this method is: a high-speed airflow is generated by a supersonic nozzle (the airflow Mach number M = 1.5 / M3.0, and nozzles with different Mach numbers can be used as needed), and the materials participating in the reaction are sent into the airflow acceleration channel. After the airflow is accelerated, a collision occurs, thereby converting the mechanical energy of the materials into chemical energy and realizing material preparation.

[0004] The existing device structure is as follows Figure 1 As shown, the device is a circulating structure, wherein 41 is a stabilizing section, which is used to control the energy of supersonic airflow; 42 is a supersonic nozzle, which is used to accelerate the airflow to supersonic speed; 43 is an accelerating section, which is used to accelerate particles; 44 is a collision chamber, which is used for collision reaction of different raw materials; 47 is a target head, which is used for solid-phase particle collision; 48 is a product recovery device, which is used to recover products that meet the conditions; 45 is a circulation pipeline, which is used for repeated circulation collision of solid-phase particles that do not meet the requirements; 46 is an air source, which is used to provide power for the airflow of the device. The basic principle is that particles, under the entrainment of the airflow, pass through the stabilizing section, the nozzle, and the accelerating section in turn, and pass through the circulation pipeline after colliding with the target head in the collision chamber. Products that meet the requirements are recovered by the recovery device, and solid-phase particles that do not meet the requirements continue to accelerate and collide again along the circulation pipeline until they meet the requirements. At present, when the device is running, the position where the particles are fed into the airflow can be along the axial direction of the stable section, the axial direction of the nozzle or the side wall. However, no matter what the position is, the main acceleration direction of the solid phase particles of different components is the same direction, that is, along the direction of the airflow. This makes it difficult to ensure the speed difference between the particles of different components when they are about to collide in front of the target head. The effect of converting mechanical energy into chemical energy through collision between particles, thereby inducing low-heat solid-phase reaction to synthesize new products, is very dependent on the speed difference when the particles collide. Taking M=3.0 as an example, theoretically, after sufficient acceleration, the absolute speed of particles of different components can reach 600-700m / s, but because they are accelerated in the same direction, the speed difference between the two is very small, so it is difficult to achieve the conversion of mechanical energy into chemical energy through collision. Summary of the invention

[0005] The purpose of the present invention is to provide a reverse air spiral powder feeding device and a double-circulation collision system and method based on the device to address the above-mentioned shortcomings, thereby improving the collision speed between mixed target powders, improving the collision energy, and solving the problems of low speed difference between mixed target powders and poor collision effect. For organic materials, the reaction efficiency is higher. For inorganic materials, the efficiency of rupture of the oxide layer on the surface of coarse particles can be improved, and even the effect of embedding fine particles into coarse particles can be achieved, thereby achieving the purpose of introducing mechanical energy to induce reaction.

[0006] The present invention is achieved through the following scheme:

[0007] A reverse air spiral powder feeding device includes at least but not limited to a particle separation device, a secondary circulation pipe and a spiral powder feeding mechanism, wherein the particle separation device is connected to an existing particle collision circulation pipeline, and the particle separation device is provided with a plurality of outlets according to different particle sizes, which at least include a fine particle outlet, a coarse particle outlet and a product particle outlet; the coarse particle outlet is connected to the feed end of the spiral powder feeding mechanism; the fine particle outlet is connected to the existing particle collision circulation pipeline; and the discharge end of the spiral powder feeding mechanism extends into the existing particle collision circulation pipeline.

[0008] Based on the structure of the above-mentioned reverse air spiral powder feeding device, the spiral powder feeding mechanism includes a feed barrel, a spiral feeding rod, a powder feeding pipe and a power mechanism; the spiral feeding rod is sleeved in the powder feeding pipe, the power mechanism is connected to the spiral feeding rod, and the feed barrel is arranged on the side wall of the spiral feeding rod close to the power mechanism.

[0009] Based on the structure of the above-mentioned reverse air spiral powder feeding device, the power mechanism includes a power source, a central rotating shaft, a rolling bearing and a sealing ring; the power source is connected to the central rotating shaft, and a rotating chamber for accommodating the rolling bearing is also provided in the main body of the spiral powder feeding mechanism, and at least two rolling bearings are provided in the rotating chamber, the central rotating shaft is provided in the rolling bearing, and the sealing ring is provided on the contact part between the central rotating shaft and the spiral powder feeding mechanism.

[0010] Based on the structure of the above-mentioned reverse air spiral powder feeding device, the spiral feeding mechanism also includes a connecting flange and a sealing ring. The spiral feeding mechanism is connected to the existing particle collision circulation pipeline through the connecting flange, and a sealing ring can be provided on the contact part between the powder feeding pipe and the connecting flange.

[0011] Based on the structure of the above-mentioned reverse air spiral powder feeding device, the particle separation device specifically adopts a cyclone separator, and the cyclone separator can distinguish particles of different sizes at different outlets according to different masses.

[0012] The present scheme also discloses a dual-circulation collision system, which at least includes but is not limited to a reverse air spiral powder feeding device and a main circulation pipeline; the main circulation pipeline includes a stabilization section, a supersonic nozzle section, an acceleration section, a collision chamber, a circulation pipeline and an air source; the stabilization section, the supersonic nozzle section, the acceleration section and the collision chamber are connected in sequence, the circulation pipeline is connected to the collision chamber and the stabilization section respectively, and the air source is arranged on the pipe wall on the side of the stabilization section; the inlet end of the reverse air spiral powder feeding device is connected to the circulation pipeline, and the outlet end of the reverse air spiral powder feeding device is inserted into the collision chamber.

[0013] Based on the structure of the above-mentioned dual-circulation collision system, the central axis of the powder feeding pipe end of the reverse air spiral powder feeding device is coaxially arranged with the pipeline formed by the stabilization section, the supersonic nozzle section and the acceleration section.

[0014] Based on the structure of the double-circulation collision system, the diameter of the powder delivery pipe is the same as the diameter of the gas source output pipe, and the outlet end of the powder delivery pipe is directly opposite to the gas source output pipe.

[0015] Based on the structure of the above-mentioned double-circulation collision system, the position of the powder hose outlet is determined when a uniform flow field is established through CFD theoretical calculation.

[0016] The present invention also discloses a double-cycle collision method, which specifically comprises the following steps:

[0017] Step 1: weigh a predetermined amount of original solid phase particles according to the ratio of solid phase particles of different components in the product;

[0018] Step 2: driving the main circulation pipeline by an air source to form a supersonic circulating airflow;

[0019] Step 3: placing a predetermined amount of original solid phase particles into the supersonic circulating airflow of the main circulation pipeline;

[0020] Step 4: The solid particles are accelerated in the stabilization section, the nozzle, and the acceleration section in sequence, during which random collisions occur; after the mixed particles pass through the collision chamber and enter the circulation pipeline, the coarse particles are separated by the particle separation device and enter the secondary circulation pipeline, and the fine particles return to the upstream of the device through the circulation pipeline for re-acceleration;

[0021] The separated coarse particles enter the spiral powder feeding mechanism through the secondary circulation pipeline and are sequentially sent to the outlet of the powder feeding pipe by the spiral powder feeding mechanism. At the outlet of the powder feeding pipe, due to the lack of airflow acceleration, the coarse particles with a lower speed collide with the accelerated supersonic fine particles upstream.

[0022] Step 5: The mixed particles after collision enter the main circulation pipe, the coarse particles are separated by the separation device, the products that meet the requirements are recovered by the recovery device at the predetermined outlet end separated by the separation device, and the remaining fine particles return to the upstream of the device to re-accelerate;

[0023] Step 6: Repeat steps 4 and 5 until all products that meet the requirements are obtained, and then turn off the gas source.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. This solution no longer uses the traditional method of mixed particles of different materials and particle sizes colliding with a fixed target head. Instead, the original target head is replaced with a spiral powder feeding device, and the large-particle material is sent to the end face of the original target head, where it collides with the small-particle material that has been accelerated and moved at high speed by the front end, thereby increasing the collision speed between materials of different particle sizes. The collision speed can reach more than twice the original speed, and the collision efficiency is higher.

[0026] 2. This scheme improves the impact velocity between mixed target powders, increases the impact energy, and solves the problem of low velocity difference between mixed target powders and poor collision effect. For organic materials, the reaction efficiency is higher. For inorganic materials, the efficiency of rupture of the oxide layer on the surface of coarse particles can be improved, and even the effect of embedding fine particles into coarse particles can be achieved, thereby achieving the purpose of introducing mechanical energy to induce reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the prior art;

[0028] Figure 2 It is a schematic diagram of the position structure of the reverse air spiral powder feeding device in the present invention;

[0029] Figure 3 It is a schematic cross-sectional structure diagram of the spiral powder feeding mechanism in the present invention;

[0030] Figure 4 It is a structural schematic diagram of the spiral feeding rod in the present invention;

[0031] Figure 5 This is the collision effect diagram of coarse and fine powder after being fed in from the same side;

[0032] Figure 6 This is the collision effect diagram of the reverse airflow spiral powder feeding device of the double-circulation collision system;

[0033] Markings in the figure: 1. Particle separation device; 2. Secondary circulation pipe; 3. Spiral powder feeding mechanism; 4. Main circulation pipeline; 31. Feed barrel; 32. Spiral feeding rod; 33. Powder feeding pipe; 34. Power mechanism; 35. Power source; 36. Central shaft; 37. Rolling bearing; 38. Sealing ring; 39. Rotating chamber; 310. Connecting flange; 41. Stabilization section; 42. Supersonic nozzle section; 43. Acceleration section; 44. Collision chamber; 45. Circulation pipeline; 46. Gas source; 47. Target head; 48. Product recovery device. DETAILED DESCRIPTION

[0034] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0035] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a predetermined direction, be constructed and operated in a predetermined direction, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0038] Example 1

[0039] like Figure 2 to Figure 4 As shown, the present invention provides a technical solution:

[0040] A reverse air spiral powder feeding device, which at least includes but is not limited to a particle separation device 1, a secondary circulation pipe 2 and a spiral powder feeding mechanism 3, wherein the particle separation device 1 is connected to an existing particle collision circulation pipeline, and the particle separation device 1 is provided with a plurality of outlets according to different particle sizes, which at least include a fine particle outlet, a coarse particle outlet and a product particle outlet; the coarse particle outlet is connected to the feed end of the spiral powder feeding mechanism 3; the fine particle outlet is connected to the existing particle collision circulation pipeline; and the discharge end of the spiral powder feeding mechanism 3 extends into the existing particle collision circulation pipeline.

[0041] Based on the above structure, the particle separation device 1 is used to classify various types of particles in the particle collision circulation pipeline, such as classifying coarse particles, fine particles and product particles. The coarse particles will be sent back to the existing particle collision circulation pipeline under the action of the spiral powder feeding mechanism 3 to collide with the high-speed moving fine particles. Since the speed of the coarse particles transported by the spiral powder feeding mechanism 3 is basically zero, there is a large speed difference between the coarse particles and the fine particles, so that the mechanical energy can be converted into chemical energy through collision, thereby obtaining a better effect of obtaining new products.

[0042] As an example, the spiral powder feeding mechanism 3 may include a feed barrel 31, a spiral feeding rod 32, a powder feeding pipe 33 and a power mechanism 34; the spiral feeding rod 32 is sleeved in the powder feeding pipe 33, the power mechanism 34 is connected to the spiral feeding rod 32, and the feed barrel 31 is arranged on the side wall of the spiral feeding rod 32 close to the power mechanism 34.

[0043] Based on the above structure, the power mechanism 34 drives the spiral feeding rod 32 to rotate, and the coarse particle material to be transported is squeezed and moved toward the outlet direction of the powder feeding pipe 33 under the rotation of the spiral feeding rod 32, until the coarse particle material is squeezed out of the powder feeding pipe 33 and enters the existing particle collision circulation pipeline with an initial velocity of zero; at the same time, the coarse particles that are not collided to form new particle materials are separated again by the particle separation device 1 in the existing particle collision circulation pipeline and are repeatedly circulated in the powder feeding pipe 33. This device can improve the collision efficiency, thereby improving the generation efficiency of new particle materials.

[0044] As an example, the power mechanism 34 may include a power source 35, a central rotating shaft 36, a rolling bearing 37 and a sealing ring 38; the power source 35 is connected to the central rotating shaft 36, and a rotating chamber 39 for accommodating the rolling bearing 37 is also provided in the main body of the spiral powder feeding mechanism 3, at least two rolling bearings 37 are provided in the rotating chamber 39, the central rotating shaft 36 is provided in the rolling bearing 37, and the sealing ring 38 is provided on the contact portion between the central rotating shaft 36 and the spiral powder feeding mechanism 3.

[0045] Based on the above structure, the power source 35 drives the central shaft 36 to rotate, thereby driving the spiral feeding rod 32 to rotate. At least two rolling bearings 37 are used to ensure the stability of the rotation, and the sealing ring 38 is provided to ensure the overall air tightness.

[0046] As an example, the spiral feeding mechanism can also include a connecting flange 310 and a sealing ring 38. The spiral feeding mechanism is connected to the existing particle collision circulation pipeline through the connecting flange 310. At the same time, a sealing ring 38 can be provided on the contact part between the powder feeding pipe 33 and the connecting flange 310 to ensure the sealing performance of the overall device; the powder feeding amount per unit time can be adjusted by adjusting the tooth spacing or the speed of the drivable motor.

[0047] As an example, the particle separation device 1 may specifically be a cyclone separator, which can separate particles of different sizes at different outlets according to their mass.

[0048] Example 2

[0049] like Figure 2 to Figure 4 As shown, the present invention provides a technical solution:

[0050] A dual-circulation collision system, which at least includes but is not limited to a reverse air spiral powder feeding device and a main circulation pipeline 4; the main circulation pipeline 4 may include a stabilization section 41, a supersonic nozzle section 42, an acceleration section 43, a collision chamber 44, a circulation pipeline 45 and an air source 46; the stabilization section 41, the supersonic nozzle section 42, the acceleration section 43 and the collision chamber 44 are connected in sequence, the circulation pipeline is connected to the collision chamber 44 and the stabilization section 41 respectively, and the air source 46 is arranged on the pipe wall on the side of the stabilization section 41; the inlet end of the reverse air spiral powder feeding device is connected to the circulation pipeline, and the outlet end of the reverse air spiral powder feeding device is inserted into the collision chamber 44.

[0051] Based on the above structure, the stabilizing section 41 is used to control the energy of the supersonic airflow; the supersonic nozzle is used to accelerate the airflow to supersonic speed; the accelerating section 43 is used for particle acceleration; the collision chamber 44 is used for collision reaction of different raw materials; the circulation pipeline 45 is used for repeated circulation collision of solid phase particles that do not meet the requirements; the gas source 46 is used to provide power for the airflow flow of the device; in this scheme, the existing main circulation pipeline 4 is used to circulate fine particle matter, and then the coarse particle matter is circulated in conjunction with the reverse air spiral powder feeding device to realize a double circulation collision system, and at the same time, the coarse particle matter is sent into the collision chamber 44 with an initial velocity of zero, and collides with the high-speed moving fine particles in the main circulation pipeline 4. At this time, the coarse particles have a very small speed, that is, there is a large speed difference between large and fine particles, which is conducive to the collision of fine particles into coarse particles.

[0052] As an example, the central axis of the end of the powder delivery pipe 33 of the reverse air spiral powder delivery device is coaxially arranged with the pipeline formed by the stabilization section 41 , the supersonic nozzle section 42 , and the acceleration section 43 .

[0053] Based on the above structure, by setting the outlet end of the coarse particle material coaxially with the center position of the particle flow formed by the acceleration of the fine particles, the coarse particles with an initial velocity of zero can collide with the accelerated fine particles as much as possible, thereby improving the collision efficiency and making it more conducive for the fine particles to collide with the coarse particles.

[0054] As an example, the diameter of the powder delivery pipe 33 is the same as the diameter of the output pipe of the gas source 46 , and the outlet end of the powder delivery pipe 33 is directly opposite to the output pipe of the gas source 46 .

[0055] Based on the above structure, the powder delivery pipe 33 delivers the coarse particle material through the spiral delivery rod 32. At this time, the discharge position of the coarse particle material in the collision chamber 44 is at the edge contour of the powder delivery pipe 33. The powder delivery pipe 33 and the air source 46 are directly opposite, and the pipe diameters of the two are the same, so that the coarse particle material can collide with the high-speed fine particle material more efficiently.

[0056] As an example, the position of the outlet end of the powder delivery pipe 33 is determined by CFD theoretical calculation when establishing a uniform flow field, and is a position that will not cause airflow blockage.

[0057] Based on the above structure, the position of the outlet end of the powder delivery pipe 33 needs to be specially set. This is because if the outlet end of the powder delivery pipe 33 is too close to the air inlet of the collision chamber 44, the shock wave formed at the outlet end will enter the acceleration section 43, causing the back pressure of the collision chamber 44 to be too high, affecting the establishment of the upstream supersonic flow field; if the distance between the front of the powder delivery pipe 33 and the air inlet of the collision chamber 44 is too far, the collision probability between coarse particles and high-speed fine particles will be greatly reduced, thereby reducing the preparation efficiency; therefore, it needs to be determined by CFD theoretical calculation when establishing a uniform flow field, and this position will not cause airflow blockage.

[0058] Example 3

[0059] The present invention provides a technical solution:

[0060] A double-cycle collision method specifically comprises the following steps:

[0061] Step 1: weigh a predetermined amount of original solid phase particles according to the ratio of solid phase particles of different components in the product;

[0062] Step 2: driving the gas source 46 to form a supersonic circulating gas flow in the main circulation pipeline 4;

[0063] Step 3: putting a predetermined amount of original solid phase particles into the supersonic circulating airflow of the main circulation pipeline 4;

[0064] Step 4: The solid particles are accelerated in sequence through the stabilization section 41, the nozzle, and the acceleration section 43, during which random collisions occur; after the mixed particles pass through the collision chamber 44 and enter the circulation pipe 45, the coarse particles are separated by the particle separation device 1 and enter the secondary circulation pipe 2, and the fine particles return to the upstream of the device through the circulation pipe 45 for re-acceleration;

[0065] The separated coarse particles enter the spiral powder feeding mechanism 3 through the secondary circulation pipe 2, and are sequentially fed to the outlet of the powder feeding pipe 33 by the spiral powder feeding mechanism 3. At the outlet of the powder feeding pipe 33, due to the lack of airflow acceleration, the coarse particles with a relatively low speed collide with the supersonic fine particles accelerated upstream.

[0066] Step 5: The mixed particles after collision enter the main circulation pipe, the coarse particles are separated by the separation device, the products that meet the requirements are recovered by the recovery device at the predetermined outlet end separated by the separation device, and the remaining fine particles return to the upstream of the device to re-accelerate;

[0067] Step 6: Repeat steps 4 and 5 until all products meeting the requirements are obtained, and then turn off the gas source 46.

[0068] Compared with the traditional single-circulation supersonic airflow acceleration device, this method forms a double-circulation supersonic airflow acceleration device, and through the corresponding experimental method, the speed difference between solid phase particles of different components is improved, and efficient collision between particles is achieved; while the spiral powder feeding mechanism 3 feeds coarse powder, fine powder is fed into the upstream of the collision chamber 44, which can ensure that the fine particles are in the core flow of the supersonic flow field, and after the fine powder is fully accelerated, it directly collides with the coarse powder fed by the spiral powder feeding device, which can ensure a better collision effect between the coarse powder and the fine powder.

[0069] In the prior art, coarse powder is fed into the upstream of the collision chamber 44, and its particle size and relative mass are relatively large. Under the action of the same speed airflow, the acceleration characteristics of the coarse powder with the airflow are significantly lower than that of the fine powder, and the collision speed is greatly reduced, resulting in a significant reduction in the collision efficiency; taking M=3.0 as an example, a method of using a fixed target head 47 at one end is adopted. Since the powder is fed into the coarse and fine powder mixture at the same end, the collision speed difference is only 200-300m / s; however, by adopting a separate powder feeding method, under the same conditions, the speed of small particles can reach 500m / s, and the speed of coarse particles (fed by a spiral powder feeding device) is almost 0, and the speed difference is greater than 500m / s, and the collision efficiency is higher;

[0070] The powder feeding process of this scheme is a process in which a motor drives the spiral rod to rotate, thereby bringing the coarse powder into the circulating reaction device against the airflow; the powder feeding process should be smooth and not blocked, and the powder feeding speed is adjustable; the static pressure at the location where the particle separation device 1 is arranged should be higher than the static pressure at the location where the feeding port is located, forming a positive pressure gradient, which is conducive to the coarse particles entering the spiral powder feeding mechanism 3 along the secondary circulation pipe 2; the arrangement form of this scheme is against the airflow, that is, the outlet of the powder feeding pipe 33 faces the incoming flow direction in the air source 46-nozzle-acceleration section 43 pipeline to achieve the collision of coarse and fine particles.

[0071] In this scheme, when coarse and fine particles are first fed into the airflow, they can be fed separately from different positions, or they can be fed together as mixed powder, depending on the difference in the design of the feed inlet. The only difference is that the former can collide according to the theoretical speed difference at the beginning of the test, while the latter has incomplete separation of particles at the beginning of the test, and is more similar to the traditional mixed collision. However, as time goes by, they will also collide according to the theoretical speed difference.

[0072] At the same time, this scheme carried out verification experiments:

[0073] The spherical solid phase particles with the same proportion were subjected to comparative tests using the conventional device and the device of the present invention under the same test conditions (same test Mach number, stable section 41 pressure and test time). The comparative results are as follows: Figure 5 and Figure 6As shown, it can be seen that although the surface of the large particles (gray) obtained by the traditional device is uneven, indicating that it has undergone a large number of collisions, there are almost no small particles (white) attached to it, indicating that the speed difference between large and small particles is insufficient, and it is difficult to embed small particles into large particles; on the contrary, the surface of the large particles (gray) obtained by the device of the present invention is almost covered with small particles (white), and at the same time, the sphericity of the large particles is also deteriorated, indicating that the speed difference between large and small particles is larger, which can better meet the collision energy requirements of small particles.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reverse air spiral powder feeding device, characterized in that: At least includes but is not limited to a particle separation device, a secondary circulation pipe and a spiral powder feeding mechanism, the particle separation device is connected to the existing particle collision circulation pipeline, the particle separation device is provided with a plurality of outlets according to different particle sizes, which at least include a fine particle outlet, a coarse particle outlet and a product particle outlet; the coarse particle outlet is connected to the feed end of the spiral powder feeding mechanism; the fine particle outlet is connected to the existing particle collision circulation pipeline; the discharge end of the spiral powder feeding mechanism extends into the existing particle collision circulation pipeline.

2. A reverse air spiral powder feeding device as claimed in claim 1, characterized in that: The spiral powder feeding mechanism comprises a feed barrel, a spiral feeding rod, a powder feeding pipe and a power mechanism; the spiral feeding rod is sleeved in the powder feeding pipe, the power mechanism is connected to the spiral feeding rod, and the feed barrel is arranged on the side wall of the spiral feeding rod close to the power mechanism.

3. A reverse air spiral powder feeding device as claimed in claim 2, characterized in that: The power mechanism includes a power source, a central rotating shaft, a rolling bearing and a sealing ring; the power source is connected to the central rotating shaft, and a rotating chamber for accommodating the rolling bearing is also provided in the main body of the spiral powder feeding mechanism, at least two rolling bearings are provided in the rotating chamber, the central rotating shaft is provided in the rolling bearing, and the sealing ring is provided on the contact portion between the central rotating shaft and the spiral powder feeding mechanism.

4. A reverse air spiral powder feeding device as claimed in claim 3, characterized in that: The spiral feeding mechanism further comprises a connecting flange and a sealing ring. The spiral feeding mechanism is connected to the existing particle collision circulation pipeline via the connecting flange. A sealing ring may be provided on the contact portion between the powder feeding pipe and the connecting flange.

5. A reverse air spiral powder feeding device as claimed in claim 4, characterized in that: The particle separation device specifically adopts a cyclone separator, and the cyclone separator can separate particles of different sizes at different outlets according to different masses.

6. A dual-cycle collision system, characterized in that: At least including but not limited to the reverse air spiral powder feeding device and the main circulation pipeline described in any one of claims 1 to 5; the main circulation pipeline includes a stabilization section, a supersonic nozzle section, an acceleration section, a collision chamber, a circulation pipeline and an air source; the stabilization section, the supersonic nozzle section, the acceleration section and the collision chamber are connected in sequence, the circulation pipeline is connected to the collision chamber and the stabilization section respectively, and the air source is arranged on the pipe wall on the stabilization section side; the inlet end of the reverse air spiral powder feeding device is connected to the circulation pipeline, and the outlet end of the reverse air spiral powder feeding device is inserted into the collision chamber.

7. A dual-cycle collision system as claimed in claim 6, characterized in that: The central axis of the powder delivery pipe end of the reverse air spiral powder delivery device is coaxially arranged with the pipeline formed by the stabilization section, the supersonic nozzle section and the acceleration section.

8. A dual-cycle collision system as claimed in claim 7, characterized in that: The diameter of the powder delivery pipe is the same as that of the gas source output pipe, and the outlet end of the powder delivery pipe is directly opposite to the gas source output pipe.

9. A dual-cycle collision system as claimed in claim 8, characterized in that: The position of the powder hose outlet is determined by CFD theoretical calculation when establishing a uniform flow field.

10. A collision method based on the double-cycle collision of any one of claims 6 to 9, characterized in that: The specific steps include: Step 1: weigh a predetermined amount of original solid phase particles according to the ratio of solid phase particles of different components in the product; Step 2: driving the main circulation pipeline by an air source to form a supersonic circulating airflow; Step 3: placing a predetermined amount of original solid phase particles into the supersonic circulating airflow of the main circulation pipeline; Step 4: The solid particles are accelerated in the stabilization section, the nozzle, and the acceleration section in sequence, during which random collisions occur; after the mixed particles pass through the collision chamber and enter the circulation pipeline, the coarse particles are separated by the particle separation device and enter the secondary circulation pipeline, and the fine particles return to the upstream of the device through the circulation pipeline for re-acceleration; The separated coarse particles enter the spiral powder feeding mechanism through the secondary circulation pipeline and are sequentially sent to the outlet of the powder feeding pipe by the spiral powder feeding mechanism. At the outlet of the powder feeding pipe, due to the lack of airflow acceleration, the coarse particles with a lower speed collide with the accelerated supersonic fine particles upstream. Step 5: The mixed particles after collision enter the main circulation pipe, the coarse particles are separated by the separation device, the products that meet the requirements are recovered by the recovery device at the predetermined outlet end separated by the separation device, and the remaining fine particles return to the upstream of the device to re-accelerate; Step 6: Repeat steps 4 and 5 until all products that meet the requirements are obtained, and then turn off the gas source.

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