A powder delivery device for particle flow lubrication

Abstract

A kind of powder feeder for particle flow lubrication, including powder mixing cavity, booster system and spray head;Powder mixing cavity is used for powder mixing operation in the process of particle delivery, its main body is oval cavity structure;Powder mixing cavity is equipped with first interface, second interface, third interface and fourth interface;First interface is connected with booster system;The inner end of first interface is provided with a section of vertically extending flow guide pipe;Second interface and third interface are connected with a powder injection system respectively;The inner end of second interface and third interface is provided with a section of inclined downward short pipe;Fourth interface is connected with spray head by gas-solid two-phase conveying hose;Booster system is used to provide high-pressure airflow to powder mixing cavity to carry out secondary pressurization to particle sprayed into powder mixing cavity;Spray head is used to direct injection of high-speed airflow carrying uniformly mixed particles to specified lubrication area.The utility model solves the problem of particle diffusion caused by insufficient air pressure of traditional device, and the device is more compact, easy to install and maintain.

Description

Technical Field

[0001] This utility model relates to the field of industrial lubrication technology, and more specifically, to a powder feeding device for particle flow lubrication. Background Technology

[0002] Friction and wear are common phenomena in industrial fields, and lubrication is an important means to reduce friction and inhibit wear. However, with the development of high-end equipment, traditional grease lubrication can no longer meet the actual needs of harsh working conditions. As a new type of lubrication technology, particulate flow lubrication, with its green, efficient, and self-compensating characteristics, has successfully solved the lubrication and wear problems in high-temperature, high-pressure, and high-vacuum conditions such as die-casting systems and aerospace bearings, becoming an irreplaceable technology in the development of aerospace and nuclear energy industries.

[0003] In particle flow lubrication, uniform delivery and stable aggregation of the lubricating medium are prerequisites and foundations for achieving efficient lubrication. Currently, pneumatic conveying remains the primary method for particle (or particle flow) delivery, using airflow to drive particle flow and achieve directional injection. However, existing pneumatic conveying systems still have certain limitations in practical applications. For example, the air pressure within the conveying pipeline tends to decrease along the flow path, causing particles at the nozzle to diffuse due to insufficient kinetic energy, making it difficult to accurately enter the target area. This not only reduces the lubrication effect but also leads to low utilization of lubricating particles. Furthermore, the mixing and conveying functions of existing powder feeding devices are usually designed as independent systems, requiring complex interfaces between the mixing device and the conveying pipeline. This not only increases equipment size and energy consumption but also leads to problems such as particle agglomeration and blockage due to multiple interconnections. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a powder feeding device for lubricating particle flow. This invention enables secondary pressure compensation during particle conveying, effectively preventing air pressure attenuation and achieving uniform mixing in multi-channel particle conveying processes. It also solves the particle diffusion problem caused by insufficient air pressure in traditional devices. Furthermore, while ensuring functional integrity, the device is more compact, guaranteeing operational stability and facilitating installation and maintenance.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a powder feeding device for particle flow lubrication. Includes the powder mixing chamber, pressurization system, and nozzle; The powder mixing chamber is used for powder mixing during the particle conveying process. Its main body has an elliptical cavity structure, and the inside of the powder mixing chamber forms a closed space that allows the airflow and powder to be fully mixed. The powder mixing chamber is equipped with a first interface, a second interface, a third interface, and a fourth interface of the same diameter to facilitate standardized pipeline connections. The first interface, serving as the airflow inlet, is located at the top of the powder mixing chamber and is connected to the pressurization system. The inner end of the first interface is equipped with a vertically extending guide tube that extends a certain length into the powder mixing chamber. The second and third interfaces serve as powder inlets, symmetrically arranged on the upper side walls of the powder mixing chamber. The second and third interfaces are respectively connected to a powder injection system that fluidizes and sprays the required particles into the powder mixing chamber. The inner ends of the second and third interfaces are each provided with a short, downward-sloping tube. The central axis of the short tube forms an acute angle with the side wall of the powder mixing chamber. The short tube extends into the powder mixing chamber to a certain length, and the length of the short tube is less than the length of the guide tube. The fourth interface, as the mixing flow outlet, is located at the bottom of the cavity. The fourth interface is connected to the nozzle through a gas-solid two-phase delivery hose. The fourth interface is arranged opposite to the guide pipe and is used to smoothly guide the gas-solid two-phase flow that has been fully mixed in the mixing cavity to the downstream gas-solid two-phase delivery hose. The pressurization system is used to increase the pressure of an external air source to form a high-pressure airflow, and to provide the high-pressure airflow to the mixing chamber to further pressurize the particles injected into the mixing chamber. The nozzle is used to direct a high-speed airflow carrying uniformly mixed particles to a designated lubrication area.

[0006] Beneficial effects: The main body of the powder mixing chamber has an elliptical cavity structure. A first interface is located at the top of the mixing chamber, connecting to a pressurization system. The inner end of the first interface has a vertically extending guide tube that penetrates a certain length into the mixing chamber, guiding the high-pressure airflow from the pressurization system to the lower part of the mixing chamber, ensuring the main airflow direction is stably towards the mixing outlet. A second and third interface are symmetrically arranged on the upper two side walls of the mixing chamber. The second and third interfaces serve as powder inlets, each connected to a powder injection system. The powder injection system injects the required particles into the mixing chamber in a flow state, achieving one-time pressurization during particle conveying. The inner ends of both the second and third interfaces have a short, downward-sloping pipe. The central axis of the short pipe forms an acute angle with the side wall of the mixing chamber, and the short pipe penetrates a certain length into the mixing chamber. The length of the tube is shorter than that of the guide tube. Thus, the particle entry direction and the main airflow direction can be intersected through the second and third interfaces. This utilizes the cavity wall of the mixing chamber as a guide to prevent particles from directly impacting the short tube opening on the opposite side, facilitating smooth particle entry into the cavity and effectively preventing obstruction of particle transport. It also creates favorable conditions for the subsequent thorough mixing of particles and airflow. When the high-pressure airflow provided by the pressurization system enters the mixing chamber through the first interface, it intersects with the particles injected into the mixing chamber, thereby giving the particles a secondary pressurization. This achieves secondary pressure compensation during the particle transport process, effectively suppressing particle dispersion caused by airflow attenuation, enhancing the cohesion of the particle flow, and significantly improving the directional transport distance. At the same time, the gas-solid two-phase transport hose allows the nozzle to move freely, enabling the nozzle to spray the particle flow at a specific lubrication area for lubrication, meeting the requirements of point-to-point lubrication.

[0007] From the perspective of gas-solid two-phase flow dynamics, the core innovation of this device lies in the introduction of an independent active pressurization system, which constructs a secondary pressure compensation mechanism. This mechanism does not act directly on the solid particles, but rather achieves this by increasing the pressure of the supporting gas phase.

[0008] The pressurized high-pressure airflow is injected into the mixing chamber, where it encounters premixed powder particles from the primary pressurized conveyor, resulting in a strong exchange of momentum and energy. This primarily produces two key effects: (1) Enhanced momentum coupling and kinetic energy compensation: The high-speed airflow efficiently transfers momentum to the particle phase through the drag force at the gas-solid interface. According to the gas-solid two-phase flow theory, the acceleration of particles directly depends on the velocity and density of the gas phase. The pressurized airflow not only has a higher velocity, but its gas density also increases due to the increased pressure, thereby significantly increasing the drag effect and greatly improving the particle's motion speed and directional kinetic energy. This effectively compensates for the kinetic energy attenuation caused by friction and collision with the pipe wall during subsequent long-distance transport, ensuring that the particles still have sufficient jet velocity when they reach the nozzle. (2) Pressure maintenance and diffusion suppression: The pressurization system increases the total pressure of the airflow. During the transport process, this increased total pressure provides the energy basis for achieving two major functions: part of it is converted into higher dynamic pressure for particle acceleration and transport; the other part is manifested as sufficient static pressure to effectively overcome the pressure loss along the flow path generated by the gas-solid two-phase flow during long-distance flexible hose transport. Essentially, it actively maintains the pressure level in the pipeline, avoiding the decrease in airflow velocity and the resulting particle diffusion caused by pressure decay, thus ensuring the stability of the flow.

[0009] Ultimately, the physical essence of the above process lies in the efficient momentum transfer from the gas phase to the solid phase and the active maintenance of the system's total pressure. The result is a gas-solid two-phase flow with higher total pressure, faster velocity, uniform solid phase distribution, and stable flow. This ensures that the particle flow possesses sufficient focus and kinetic energy to be precisely injected into the target lubrication area.

[0010] Based on the above, the powder injection system includes a powder bottle and a pneumatic conveying pipe; The powder bottle stores the required granules. The top of the powder bottle is equipped with two airflow ducts. The other ends of the two airflow ducts are connected to the pneumatic conveying pipe at intervals along the airflow direction. One airflow duct upstream of the pneumatic conveying pipe inputs the airflow from the pneumatic conveying pipe into the powder bottle to diffuse the granules. The other airflow duct sprays the airflow and granules from the powder bottle to the downstream of the pneumatic conveying pipe. One end of the pneumatic conveying pipe is connected to an external air source, and the other end is connected to a second or third interface.

[0011] Beneficial effects: An airflow duct upstream of the pneumatic conveying pipe can introduce airflow from an external air source into the powder bottle, allowing the particles inside the powder bottle to be fully diffused. At the same time, based on the ejector principle, the pneumatic conveying pipe can entrain the particles in the powder bottle. Another airflow duct leads the airflow carrying the particles downstream of the pneumatic conveying pipe, thereby continuously conveying the particles in a flow state and spraying them into the mixing chamber through the second or third interface, making it easier for the particles to be output from the powder bottle.

[0012] Based on the above, an adjustable injection valve is installed on the pneumatic conveying pipe. The adjustable injection valve is located upstream of an airflow duct upstream of the pneumatic conveying pipe and is used to control the amount of particles conveyed per unit time.

[0013] Beneficial effects: The gas flow rate of the pneumatic conveying pipe can be controlled by the adjustable injection valve, thereby controlling the amount of particles conveyed per unit time. For two or more types of particles, the proportion of different particles can be controlled.

[0014] Based on the above, the pneumatic delivery pipe is connected to the second or third interface via a quick-connect coupling.

[0015] Beneficial effects: The quick-connect fitting allows for quick assembly and disassembly of the pneumatic delivery pipe to the second or third interface.

[0016] Based on the above, one end of the gas-solid dual-phase delivery hose is connected to the fourth interface via a quick-connect fitting, and the other end is connected to the nozzle via a socket fitting.

[0017] Beneficial effects: The quick-connect fitting allows for quick and easy installation and removal of the gas-solid dual-phase delivery hose from the fourth interface, thus meeting the requirement that the end of the gas-solid dual-phase delivery hose connected to the powder mixing chamber needs to be frequently disassembled for maintenance and replacement; at the same time, the socket fitting enables reliable locking and fixing of the gas-solid dual-phase delivery hose to the nozzle, maintaining long-term sealing reliability, thus meeting the high mechanical load borne by the end of the gas-solid dual-phase delivery hose connected to the nozzle.

[0018] Based on the above, the connection between the nozzle and the gas-solid dual-phase delivery hose is equipped with a fluororubber O-ring to ensure reliable sealing under high-pressure conditions.

[0019] Based on the above, the gas-solid two-phase transport hose is made of polyurethane. This material has high strength, high wear resistance, and excellent flexibility, which can ensure that the pipeline maintains good morphological stability and sealing integrity under high pressure and high speed transport conditions. This effectively prevents pressure leakage and mixture dispersion caused by pipeline deformation or wear, and ensures the flow stability of the gas-solid two-phase flow throughout the entire transport process.

[0020] Based on the above, the nozzle has a tapered flow channel. The flow channel inlet of the nozzle tapers to the outlet through a cone angle. The tapered flow channel design can accelerate the high-speed airflow carrying uniformly mixed particles, further enhancing the cohesion of the particle flow.

[0021] Based on the above, the nozzle is made of engineering plastic injection molding, which has high strength, is easy to manufacture, and has low cost.

[0022] Based on the above, the supercharging system is equipped with an intake pipe and an exhaust pipe. The intake pipe is used to connect to an external air source, and the exhaust pipe is used to output high-pressure airflow and connect to the first interface. The booster system is also equipped with an airflow switch for controlling the start and stop of the booster system, a pressure regulating knob for adjusting the required gas pressure and airflow speed, and a pressure gauge for displaying the working pressure.

[0023] In summary, this invention utilizes a pressurization system to provide secondary pressure compensation to the particle flow, effectively preventing air pressure attenuation during particle transport and achieving uniform mixing of multiple powder streams. While maintaining a stable airflow velocity, this device significantly enhances the kinetic energy of particle transport, enabling particles to be continuously and efficiently transported to the nozzle, thus solving the particle diffusion problem caused by insufficient air pressure in traditional devices. Furthermore, while ensuring functional integrity, the device is more compact, guaranteeing operational stability and facilitating installation and maintenance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a cross-sectional view of the powder mixing chamber of this utility model.

[0026] In the diagram: 1. Pressurization system; 2. Air supply hose; 3. Powder mixing chamber; 4. Gas-solid dual-phase conveying hose; 5. Nozzle; 6. First interface; 7. Second interface; 8. Third interface; 9. Fourth interface; 10. Air inlet pipe; 11. Air outlet pipe; 12. Airflow switch; 13. Pressure regulating knob; 14. Pressure gauge; 15. Powder bottle; 16. Pneumatic conveying pipe; 17. Adjustable injection valve; 18. Airflow duct. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] In the diagram, solid arrows indicate the direction of the main airflow after secondary pressurization by the pressurization system; dashed arrows indicate the trajectory of the particles output by the powder injection system after primary pressurization; and dovetail arrows indicate the path of the high-speed gas-solid two-phase flow formed after the pressurized main airflow mixes with the particles.

[0029] Example 1 like Figure 1 and Figure 2 As shown, a powder feeding device for particle flow lubrication includes a pressurization system 1, an air supply hose 2, a powder mixing chamber 3, a gas-solid dual-phase conveying hose 4, and a nozzle 5.

[0030] The powder mixing chamber 3 is used for powder mixing during the particle conveying process. Its main body has an elliptical cavity structure. The inside of the powder mixing chamber 3 forms a closed space that allows the airflow and powder to be fully mixed. The powder mixing chamber 3 is equipped with a first interface 6, a second interface 7, a third interface 8, and a fourth interface 9 of the same diameter, which facilitates standardized pipeline connection.

[0031] The first interface 6 serves as the airflow inlet and is located at the top of the powder mixing chamber 3. It is connected to the pressurization system. The inner end of the first interface 6 is provided with a vertically extending guide tube. The guide tube extends a certain length into the powder mixing chamber 3 and can guide the high-pressure airflow from the pressurization system to the lower part of the powder mixing chamber 3, ensuring that the main airflow direction is stably towards the mixing outlet. The second interface 7 and the third interface 8 serve as powder inlets, symmetrically arranged on the upper side walls of the powder mixing chamber 3. The second interface 7 and the third interface 8 are respectively connected to a powder injection system that fluidizes and sprays the required particles into the powder mixing chamber 3. The inner ends of the second interface 7 and the third interface 8 are each provided with a short, downward-sloping tube. The central axis of the short tube forms an acute angle with the side wall of the powder mixing chamber 3. The short tube extends a certain length into the powder mixing chamber 3, and the length of the short tube is less than the length of the guide tube. In this way, the particle entry direction can be made to converge with the main airflow direction through the second and third interfaces. This utilizes the cavity wall of the powder mixing chamber 3 to guide the particles, preventing them from directly hitting the short tube opening on the opposite side, facilitating the smooth entry of particles into the cavity, effectively preventing obstruction of particle transport, and creating favorable conditions for the subsequent full mixing of particles and airflow. The fourth interface 9 serves as the mixing flow outlet and is located at the bottom of the cavity. The fourth interface 9 is connected to the nozzle 5 via the gas-solid two-phase delivery hose 4. The fourth interface 9 is arranged opposite to the guide pipe and is used to smoothly guide the gas-solid two-phase flow that has been fully mixed in the mixing cavity 3 to the downstream gas-solid two-phase delivery hose 4. The pressurization system is used to increase the pressure of an external air source to form a high-pressure airflow, and to provide the high-pressure airflow to the mixing chamber 3 to further pressurize the particles injected into the mixing chamber 3. Nozzle 5 is used to directionally spray a high-speed airflow carrying uniformly mixed particles onto a designated lubrication area.

[0032] The pressurization system 1 is equipped with an air inlet pipe 10 and an air outlet pipe 11. The air inlet pipe 10 is connected to an external air source, and the air outlet pipe 11 is sealed to the first interface 6 of the powder mixing chamber 3 through the air supply hose 2.

[0033] The booster system 1 is also equipped with an airflow switch 12 for controlling the start and stop of the booster system 1, a pressure regulating knob 13 for adjusting the required gas pressure and airflow speed, and a pressure gauge 14 for displaying the working pressure.

[0034] Furthermore, the second interface 7 is connected to the first powder injection system, and the third interface 8 is connected to the second powder injection system. The two powder injection systems have the same structure. Taking the first powder injection system as an example, the following explanation will be provided: The first powder injection system includes a powder bottle 15, a pneumatic conveying pipe 16, and an adjustable injection valve 17; The powder bottle 15 stores the required granules. The top of the powder bottle 15 is provided with two airflow ducts 18. The other ends of the two airflow ducts 18 are connected to the pneumatic conveying pipe 16 at intervals along the airflow direction. One airflow duct 18 upstream of the pneumatic conveying pipe 16 inputs the airflow from the pneumatic conveying pipe 16 into the powder bottle 15 to diffuse the granules. The other airflow duct 18 sprays the airflow and granules from the powder bottle 15 to the downstream of the pneumatic conveying pipe 16. One end of the pneumatic conveying pipe 16 is connected to an external air source, and the other end is connected to the second interface 7 via a quick-connect connector, which allows for quick assembly and disassembly of the pneumatic conveying pipe 16 and the second interface 7. An adjustable injection valve 17 is installed on the pneumatic conveying pipe 16 and located upstream of an airflow duct 18 upstream of the pneumatic conveying pipe 16, and is used to control the amount of particles conveyed per unit time.

[0035] Furthermore, in order to accommodate the requirement that the end of the gas-solid dual-phase conveying hose 4 connected to the powder mixing chamber 3 needs to be frequently disassembled for maintenance and replacement, one end of the gas-solid dual-phase conveying hose 4 is connected to the fourth interface 9 via a quick-connect coupling; at the same time, because the end of the gas-solid dual-phase conveying hose 4 connected to the nozzle 5 bears a high mechanical load, the gas-solid dual-phase conveying hose 4 and the nozzle 5 are connected via a socket coupling, thereby achieving reliable locking and fixing of the gas-solid dual-phase conveying hose 4 and the nozzle 5, and maintaining long-term sealing reliability.

[0036] Furthermore, the connection between the nozzle 5 and the gas-solid dual-phase delivery hose 4 is equipped with a fluororubber O-ring to ensure reliable sealing under high-pressure conditions.

[0037] Furthermore, the gas-solid two-phase conveying hose 4 is made of polyurethane. This material has high strength, high wear resistance, and excellent flexibility, which can ensure that the pipeline maintains good morphological stability and sealing integrity under high pressure and high speed conveying conditions, thereby effectively preventing pressure leakage and mixture dispersion caused by pipeline deformation or wear, and ensuring the flow stability of the gas-solid two-phase flow throughout the entire conveying process.

[0038] Furthermore, the flow channel of nozzle 5 is a tapered flow channel. The inlet of nozzle 5 gradually narrows to the outlet through a cone angle. The tapered flow channel design can accelerate the high-speed airflow carrying uniformly mixed particles, further enhancing the cohesion of the particle flow.

[0039] Furthermore, the nozzle 5 is made of engineering plastic injection molding, which has high strength, is easy to manufacture, and has low cost.

[0040] When this invention is in operation, according to the ejector principle, the high-speed airflow ejected by the nozzle 5 generates a negative pressure effect. When the pneumatic conveying pipe 16 is connected to an external air source, an airflow conduit 18 upstream of the pneumatic conveying pipe 16 introduces the airflow from the external air source into the powder bottle 15, allowing the particles in the powder bottle 15 to fully diffuse. Simultaneously, according to the ejector principle, the pneumatic conveying pipe 16 can entrain the particles in the powder bottle 15. Another airflow conduit guides the airflow carrying the particles downstream of the pneumatic conveying pipe 16, thus continuously conveying the particles in a flowing state and injecting them into the mixing chamber 3 through the second interface 7 or the third interface 8, making it easier for the particles to exit from the powder bottle 15. By adjusting the corresponding adjustable injection valve 17, the particles from the two powder bottles 15 can be proportionally and continuously injected into the mixing chamber 3 through the pneumatic conveying pipe 16 and filled. The mixture is thoroughly mixed. Simultaneously, the airflow switch 12 is turned on to start the pressurization system 1. The output air pressure of the pressurization system 1 is adjusted by the pressure regulating knob 13. The compressed airflow from the external air source enters the pressurization system 1 to increase the pressure. The pressurized high-pressure airflow is delivered to the powder mixing chamber 3 through the air supply hose 2 and the first interface 6. The high-pressure airflow merges with the particles injected into the powder mixing chamber 3. The high-pressure airflow then pressurizes the particles injected into the powder mixing chamber 3 a second time to form a high-speed gas-solid two-phase flow. This achieves secondary pressure compensation during the particle conveying process, thereby effectively suppressing particle dispersion caused by airflow attenuation, enhancing the concentration of the particle flow, and significantly improving the directional conveying distance. Afterward, the high-speed gas-solid two-phase flow is delivered to the nozzle 5 through the gas-solid two-phase conveying hose 4. After being accelerated by the tapered flow channel of the nozzle 5, it is sprayed out and accurately sprayed to the target position to meet the fixed-point lubrication requirements.

[0041] Example 2 Based on Example 1, the quick-connect connector connecting the third interface 8 of the powder mixing chamber 3 to the second powder injection system can be removed, and the third interface 8 of the powder mixing chamber 3 can be sealed with a pneumatic quick-connect plug to block the particle flow channel. Then, the output air pressure of the pressurization system 1 is adjusted to the appropriate value, and the particle output is controlled by the adjustable injection valve 17 of the first powder injection system, so that the particles in the powder bottle 15 of the first powder injection system are stably transported to the powder mixing chamber through the corresponding pneumatic conveying pipe 16, and after secondary pressurization, they are directionally injected from the nozzle 5, thereby achieving the supply of single lubricating particles. At this time, no powder mixing occurs in the powder mixing chamber, only the secondary pressurization function is realized.

[0042] Example 3 Based on Example 1, particle conveying paths can be added according to process requirements. First, the mixing chamber 3 is replaced with a multi-channel chamber element with the same number of interfaces as the required particle conveying paths, and a matching number of powder injection systems and pressurization systems 1 are connected to the multi-channel chamber element to ensure that the multiple particle conveying paths are unobstructed.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A powder feeding device for lubrication of particulate flow, characterized in that: Includes the powder mixing chamber, pressurization system, and nozzle; The powder mixing chamber is used for powder mixing during the particle conveying process. Its main body has an elliptical cavity structure, and the inside of the powder mixing chamber forms a closed space that allows the airflow and powder to be fully mixed. The powder mixing chamber is equipped with a first interface, a second interface, a third interface, and a fourth interface of the same diameter; The first interface, serving as the airflow inlet, is located at the top of the powder mixing chamber and is connected to the pressurization system. The inner end of the first interface is equipped with a vertically extending guide tube that extends a certain length into the powder mixing chamber. The second and third interfaces serve as powder inlets, symmetrically arranged on the upper side walls of the powder mixing chamber. The second and third interfaces are respectively connected to a powder injection system that fluidizes and sprays the required particles into the powder mixing chamber. The inner ends of the second and third interfaces are each provided with a short, downward-sloping tube. The central axis of the short tube forms an acute angle with the side wall of the powder mixing chamber. The short tube extends into the powder mixing chamber to a certain length, and the length of the short tube is less than the length of the guide tube. The fourth port, serving as the mixing flow outlet, is located at the bottom of the cavity and is connected to the nozzle via a gas-solid dual-phase delivery hose. The fourth interface is arranged opposite to the guide pipe and is used to smoothly guide the gas-solid two-phase flow that has been fully mixed in the mixing chamber to the downstream gas-solid two-phase delivery hose. The pressurization system is used to increase the pressure of an external air source to form a high-pressure airflow, and to provide the high-pressure airflow to the mixing chamber to further pressurize the particles injected into the mixing chamber. The nozzle is used to direct a high-speed airflow carrying uniformly mixed particles to a designated lubrication area.

2. The powder feeding device for particulate flow lubrication according to claim 1, characterized in that: The powder injection system includes a powder bottle and a pneumatic conveying pipe; The powder bottle stores the required granules. The top of the powder bottle is equipped with two airflow ducts. The other ends of the two airflow ducts are connected to the pneumatic conveying pipe at intervals along the airflow direction. One airflow duct upstream of the pneumatic conveying pipe inputs the airflow from the pneumatic conveying pipe into the powder bottle to diffuse the granules. The other airflow duct sprays the airflow and granules from the powder bottle to the downstream of the pneumatic conveying pipe. One end of the pneumatic conveying pipe is connected to an external air source, and the other end is connected to a second or third interface.

3. The powder feeding device for particle flow lubrication according to claim 2, characterized in that: An adjustable jet valve is installed on the pneumatic conveying pipe. The adjustable jet valve is located upstream of an airflow duct upstream of the pneumatic conveying pipe and is used to control the amount of particles conveyed per unit time.

4. The powder feeding device for particle flow lubrication according to any one of claims 1-3, characterized in that: The pneumatic delivery pipe is connected to the second or third interface via a quick-connect coupling.

5. The powder feeding device for particle flow lubrication according to any one of claims 1-3, characterized in that: One end of the gas-solid dual-phase delivery hose is connected to the fourth interface via a quick-connect fitting, and the other end is connected to the nozzle via a socket fitting.

6. The powder feeding device for particle flow lubrication according to any one of claims 1-3, characterized in that: The connection between the nozzle and the gas-solid dual-phase delivery hose is equipped with a fluororubber O-ring.

7. The powder feeding device for particulate flow lubrication according to any one of claims 1-3, characterized in that: The gas-solid dual-phase delivery hose is made of polyurethane.

8. The powder feeding device for particle flow lubrication according to any one of claims 1-3, characterized in that: The nozzle has a tapered flow channel, with the flow channel inlet tapering towards the outlet via a cone angle.

9. The powder feeding device for particle flow lubrication according to any one of claims 1-3, characterized in that: The nozzle is made of engineering plastic injection molding.

10. The powder feeding device for particulate flow lubrication according to any one of claims 1-3, characterized in that: The supercharging system is equipped with an intake pipe and an exhaust pipe. The intake pipe is used to connect to an external air source, and the exhaust pipe is used to output high-pressure airflow and connect to the first interface. The booster system is also equipped with an airflow switch for controlling the start and stop of the booster system, a pressure regulating knob for adjusting the required gas pressure and airflow speed, and a pressure gauge for displaying the working pressure.

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