Titanium powder filtering and recycling system and titanium powder recycling method thereof

Abstract

The invention relates to a titanium powder filtering and recycling system and a titanium powder recycling method thereof. The titanium powder filtering and recycling system comprises a basic filtering unit and a central controller. The basic filter unit comprises a filter tank body and an annular filter screen, and the filter screen divides the hollow cavity into an external powder-containing gas cavity and an internal inert gas channel. Inert gas containing titanium powder enters the powder-containing gas cavity through the gas inlet pipeline, gas-solid separation is achieved through the annular filter screen, and then clean gas is discharged from the gas outlet pipeline. The inert gas channel is internally provided with a rotary jet flow blowback module used for jetting reverse airflow to the inner surface of the annular filter screen to remove accumulated powder; a powder discharging pipeline and a valve group are arranged at the bottom of the filtering tank body; and an electromagnetic vibrator and a titanium powder recycling box are mounted at the lower part of the outer wall. The titanium powder recovery device can effectively solve the problems of filter screen blockage and difficult powder discharge in the titanium powder recovery process, and has the advantages of being high in filtering efficiency, thorough in recovery, good in safety and high in intelligent degree.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing powder recycling, and more particularly to a titanium powder filtering and recycling system and a titanium powder recycling method thereof. BACKGROUND

[0002] With the promotion of "Industry 4.0" and the transformation and upgrading of manufacturing industry, additive manufacturing (3D printing), precision numerical control machining (CNC) and other technologies are increasingly popular in the fields of 3C industry, aerospace and medical devices. In these processing processes, especially when active metal materials such as titanium alloy are involved, a large amount of waste gas containing extremely fine metal powder will be generated. Since titanium powder has active chemical properties and belongs to flammable and explosive dust, it must be filtered and recycled under the protection of inert gas (such as argon) that is completely isolated from air to ensure production safety and reduce the loss of expensive raw materials.

[0003] Currently, there are some filtering and recycling devices for 3D printing in related fields. For example, Chinese patent application CN110327672A discloses an alcohol double-filtering and recycling device for 3D printing cleaning. The device mainly includes an L-shaped base body with a liquid inlet at the top, a porous ceramic filter element arranged in the base body, a liquid seepage hole arranged on the bottom cross pipe of the base body, a three-layer filtration membrane sleeved outside the liquid seepage hole, a filtrate conduit, and a sealing plug. The working principle is as follows: the cleaning residual liquid passes through the porous ceramic filter element to complete the solid-liquid separation, the liquid enters the bottom cross pipe and then flows out from the liquid seepage hole, and then the three-layer filtration membrane separates the molecules of different sizes, and finally the high-purity alcohol is filtered out. The device mainly recycles the liquid (alcohol) after 3D printing cleaning, aiming to solve the problem of liquid recycling.

[0004] However, this recycling device cannot be directly used to recycle titanium powder, and additional complex liquid-solid separation and drying processes are required, which not only has a complicated process flow and high energy consumption, but also easily introduces oxygen during the drying process, causing titanium powder oxidation and deterioration, affecting the recycling quality, and even causing combustion and explosion, with poor safety. In addition, the device is designed based on the principle of liquid permeation, and the L-shaped base body, porous ceramic filter element and filtration membrane structure inside the device cannot adapt to the large flow of gas required for gas-solid separation, and lack the active dust removal and forced powder discharge mechanism for dry powder materials. If it is directly used to treat titanium-containing gas, the titanium powder will quickly block the filter element and the liquid seepage hole, causing the recycling system to fail.

[0005] In addition, many existing recycling equipment relies on manual experience for operation, and lacks real-time monitoring and intelligent linkage control of key parameters (such as dust concentration, temperature, etc.) inside the system. This manual operation mode not only has low efficiency and is difficult to seamlessly connect with modern fully automatic production lines, but also has a lagging response when dealing with unexpected situations, and cannot fundamentally eliminate the safety risks caused by human errors or monitoring blind spots. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a titanium powder filtration and recovery system and a titanium powder recovery method, which address the above-mentioned deficiencies of the prior art.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: On one hand, the present invention provides a titanium powder filtration and recovery system, comprising a basic filtration unit and a central controller. The basic filtration unit includes a filter tank with a sealed hollow chamber and an annular filter screen vertically disposed within the filter tank for filtering titanium powder. The annular filter screen divides the hollow chamber into an external powder-containing gas chamber and an inert gas channel located in the hollow portion of the annular filter screen. An inlet pipe connected to the powder-containing gas chamber is provided on one side of the filter tank for receiving inert gas containing titanium powder. An outlet pipe connected to the inert gas channel is provided at the upper end of the filter tank for discharging... Clean gas; the inert gas channel is equipped with a rotating jet backflushing module for spraying reverse airflow onto the inner surface of the annular filter screen; the bottom of the filter tank is also equipped with a powder discharge pipe and a titanium powder recovery box connected to the powder discharge pipe; the powder discharge pipe is equipped with a valve group for opening or closing its internal channels; an electromagnetic vibrator is also installed on the outer wall of the lower part of the filter tank for driving the titanium powder under backflushing to fall off the inner wall of the filter tank and slide towards the powder discharge pipe; the rotating jet backflushing module, the valve group and the electromagnetic vibrator are all electrically connected to and controlled by the central controller.

[0008] The titanium powder filtration and recovery system of the present invention includes a rotary jet backflushing module comprising a rotary jet nozzle extending into the inert gas channel; the connecting end of the rotary jet nozzle passes through the top of the filter tank and is driven by a gear transmission assembly meshing with a drive gear on the output shaft of an explosion-proof motor located at the top of the outer side of the filter tank; the end of the rotary jet nozzle extending into the inert gas channel is provided with a plurality of nozzles circumferentially, and the explosion-proof motor drives the rotary jet nozzle to rotate, so that high-pressure inert gas passes through the nozzles to form a pulsed rotary jet that cleans the inner surface of the annular filter screen.

[0009] The titanium powder filtration and recovery system of the present invention includes a valve group comprising a first valve and a second valve arranged sequentially from top to bottom along the powder discharge pipe, and a titanium powder recovery box connected to the end of the powder discharge pipe via a flange.

[0010] The titanium powder filtration and recovery system of the present invention includes a gas fluidizing ring, which is an annular tubular structure with a plurality of uniformly distributed pores. The gas fluidizing ring is connected to an external inert gas supply unit through a gas supply pipeline for injecting fluidizing gas into the powder layer above the powder discharge pipe inlet.

[0011] The titanium powder filtration and recovery system of the present invention further includes a sensor group, which includes a differential pressure sensor connected across the inner and outer sides of the annular filter screen, a dust concentration sensor installed on the top of the filter tank or at the powder discharge pipe, and a temperature sensor installed on the filter tank. The sensor group transmits the monitoring signals to the central controller.

[0012] The titanium powder filtration and recovery system of the present invention includes a central controller with built-in adaptive backflushing control logic. Based on the real-time resistance data or its changing trend monitored by the differential pressure sensor, the controller automatically determines the optimal backflushing time and controls the rotating jet backflushing module to start backflushing as needed.

[0013] The titanium powder filtration and recovery system of the present invention comprises an annular filter screen formed by folding and wrapping high-temperature resistant metal sintered sheets or filter sheets in sequence.

[0014] In the titanium powder filtration and recovery system of the present invention, the titanium powder recovery box is a sealed storage tank that is detachably connected to the powder discharge pipe.

[0015] On the other hand, the present invention also provides a method for recovering titanium powder, using a titanium powder filtration and recovery system as described in any of the above claims, wherein the method includes the following steps: S1: Inert gas containing titanium powder enters the powder-containing gas chamber of the filter tank through the inlet pipe. After being filtered by the annular filter screen, the titanium powder is filtered onto the outer surface of the annular filter screen. The clean inert gas enters the inert gas channel and is discharged from the outlet pipe. S2: According to the backflush instruction, the central controller closes the air intake pipe and the dust discharge pipe, starts the rotary jet backflush module, drives its nozzle to rotate at low speed and sprays high-pressure inert gas to form a dynamic rotary jet to backflush the inner surface of the annular filter screen, so that the dust attached to the outer surface of the filter screen falls back onto the inner wall of the filter tank or the bottom of the tank. S3: When the powder discharge trigger condition is met, the central controller executes the intelligent powder discharge program: the electromagnetic vibrator is started to loosen the powder, and then the valve group on the powder discharge pipeline is opened according to the preset program, so that the powder is automatically discharged into the recycling box in a quasi-fluid state under the action of vibration. S4: During the entire operation, dust concentration and temperature are monitored in real time. If the values ​​are abnormal, an emergency shutdown and protective gas charging measures will be triggered immediately.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention features a specially designed rotating jet backflushing module within the inert gas channel. This module generates a 360-degree dynamically rotating high-pressure reverse jet to powerfully purge the inner surface of the annular filter screen from all directions. Compared to existing technologies, the rotating jet of this invention generates stronger shearing force, penetrating deep into the filter screen pores to thoroughly remove highly adhesive titanium powder, effectively preventing filter screen clogging, significantly extending the service life of the filter element, and ensuring long-term stable filtration efficiency of the system.

[0017] 2. This invention features an electromagnetic vibrator installed on the lower outer wall of the filter tank, working in conjunction with the backflushing action. When the backflushing module blows dust from the outer surface of the filter screen to the bottom of the tank or the inner wall of the filter tank, the electromagnetic vibrator activates, vibrating the tank at high frequency. This disrupts the van der Waals forces and bridging structures between the powder particles, allowing the powder to flow smoothly into the discharge pipe in a fluidized state. This dual discharge mechanism of "backflushing + vibration" ensures complete recovery of titanium powder, avoiding the waste of expensive titanium powder raw materials, and eliminating safety hazards such as spontaneous combustion that may arise from long-term powder accumulation in dead corners of the equipment.

[0018] 3. This invention integrates a central controller, achieving fully automatic closed-loop control of the system. The central controller can automatically coordinate and control the sequence and parameters of the rotating jet backflushing module, valve group, and electromagnetic vibrator based on preset programs or sensor feedback (such as differential pressure, time, etc.), without manual intervention. This not only significantly improves production efficiency and reduces labor costs, but more importantly, it avoids the risk of misoperation that may arise from manual operation. Simultaneously, the fully sealed inert gas environment, combined with intelligent control, prevents the entry of outside air, fundamentally ensuring the safety of the flammable and explosive titanium powder processing process.

[0019] 4. This invention abandons the L-shaped substrate and permeate membrane structures found in existing liquid phase filtration devices (such as alcohol recovery devices), which are unsuitable for gases. It innovatively employs a ring-shaped filter screen to divide the chamber into a powder-containing gas chamber and an inert gas channel. This structure is specifically optimized for high-flow-rate gas-solid separation, exhibiting low gas flow resistance and a large filtration area, perfectly meeting the needs of treating large amounts of titanium powder-containing waste gas generated during 3D printing and CNC machining. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1This is a schematic diagram of a titanium powder filtration and recovery system according to Embodiment 1 of the present invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of a titanium powder filtration and recovery system according to Embodiment 1 of the present invention.

[0022] Figure 3 yes Figure 2 A schematic diagram of the structure of the gas fluidizing ring 17.

[0023] Figure 4 This is a schematic diagram of the inert gas backflushing principle in a titanium powder filtration and recovery system according to Embodiment 1 of the present invention. Detailed Implementation

[0024] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0027] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0029] Example 1: Embodiment 1 of the present invention provides a titanium powder filtration and recovery system, such as Figures 1-4 As shown, the titanium powder filtration and recovery system mainly includes a basic filtration unit 10 and a central controller (not shown in the figure). This system is specifically designed for the efficient filtration and recovery of titanium powder-containing waste gas generated during 3D printing or precision machining in an inert gas protected environment.

[0030] The basic filtration unit 10 includes a filter tank 11 with a sealed hollow chamber. The filter tank 11 is typically made of stainless steel, capable of withstanding the pressure of the internal inert gas and ensuring isolation from the outside air to prevent oxidation or combustion of the titanium powder. Inside the filter tank 11, a vertically arranged annular filter screen 12 is installed. In this embodiment, the annular filter screen 12 is preferably formed by folding and wrapping high-temperature resistant metal sintered sheets or filter sheets in sequence. This structure not only significantly increases the filtration area and reduces filtration resistance but also possesses good high-temperature resistance and mechanical strength. The annular filter screen 12 spatially divides the hollow chamber of the filter tank 11 into two parts: the outer part of the annular filter screen 12 is the powder-containing gas chamber 01, and the hollow part of the annular filter screen 12 is the inert gas channel 02.

[0031] An air inlet pipe 111 is provided on one side wall of the filter tank 11. This air inlet pipe 111 is connected to the powder-containing gas chamber 01 and is used to receive inert gas containing titanium powder supplied from the production equipment. It should be noted that the inert gas can be any of argon (Ar), nitrogen (N2), or helium (He). Considering the oxidation prevention requirements of titanium alloy processing, argon is preferred as the protective gas. An air outlet pipe 112 is provided at the top of the filter tank 11, which is connected to the inert gas channel 02. During operation, the gas containing titanium powder enters the powder-containing gas chamber 01. Under the action of pressure difference, the titanium powder is intercepted in the powder-containing gas chamber 01 on the outer surface of the annular filter screen 12; while the clean inert gas enters the internal inert gas channel 02 and is finally discharged through the air outlet pipe 112 for recycling. This external-in, internal-out filtration method is beneficial for dust backflushing and cleaning.

[0032] In particular, in order to realize the recycling of inert gas, reduce system energy consumption and ensure the purity of backflushing gas, this embodiment provides a rotating jet backflushing module 13 in the inert gas channel 02, and adds a gas circulation structure between the gas outlet pipe 112 and the rotating jet backflushing module 13.

[0033] Specifically, a bypass return branch pipe 20 is connected to the outlet pipe 112, which extends to the rotary jet backflushing module 13 located at the top of the filter tank 11. A backflushing booster fan 21 and a backflushing control valve 22 are connected in series along the gas flow direction on the bypass return branch pipe. During backflushing cleaning, a portion of the clean inert gas discharged from the outlet pipe 112 is diverted into the bypass return branch pipe. After being pressurized by the backflushing booster fan, a high-pressure backflushing airflow is formed. This high-pressure airflow is then transported to the rotary jet nozzle 131 after passing through the backflushing control valve. The advantages of this structural design are: firstly, it achieves internal gas circulation, eliminating the need for additional high-pressure nitrogen or argon cylinders, significantly reducing operating costs; secondly, it ensures media consistency, as the backflushing gas originates from the system itself, and its temperature, humidity, and composition are completely consistent with the tank environment, avoiding temperature difference condensation or impurity contamination caused by the introduction of external gases, further improving the quality and safety of titanium powder recovery.

[0034] Furthermore, the rotary jet backflushing module 13 includes a rotary jet nozzle 131 extending into the inert gas channel 02. The connecting end of the rotary jet nozzle 131 passes through the top of the filter tank 11 and is connected to a drive gear on the output shaft of an explosion-proof motor 132 located at the top of the tank via a gear transmission assembly. The end of the rotary jet nozzle 131 extending into the inert gas channel 02 has several nozzles 133 circumferentially arranged. In this embodiment, the gear transmission assembly is a multi-gear set structure as used in the prior art. When dust removal is required, the central controller activates the backflushing control valve and the backflushing booster fan, allowing clean high-pressure gas from the outlet pipe 112 to be reused and pressurized into the nozzle 131. Simultaneously, the explosion-proof motor 132 drives the rotary jet nozzle 131 to rotate at a low speed, and the high-pressure inert gas is ejected through the nozzles 133, forming a pulsed rotary jet that provides 360-degree full coverage cleaning of the inner surface of the annular filter screen 12. Compared to traditional fixed backflushing, this dynamic backflushing method generates stronger airflow shearing force and has no dead cleaning corners. It can effectively peel off titanium powder adsorbed deep in the filter pores, thereby preventing the filter from being clogged by titanium powder.

[0035] To facilitate the smooth discharge of the stripped titanium powder, an electromagnetic vibrator 16 is installed on the lower outer wall of the filter tank 11. During the powder discharge process, the electromagnetic vibrator 16 applies high-frequency vibration to the filter tank 11, causing the titanium powder adhering to the inner wall of the filter tank 11 or accumulated at the bottom to loosen, breaking the adhesion between the powder particles, and allowing them to slide down to the powder discharge pipe 113 at the bottom under the action of gravity. This mechanical vibration-assisted powder discharge method greatly improves the smoothness of discharge and avoids powder residue.

[0036] Furthermore, the bottom of the filter tank 11 is provided with a powder discharge pipe 113, and the end of the powder discharge pipe 113 is connected to a titanium powder recovery box 14 via a flange. This titanium powder recovery box 14 is a sealed storage tank structure, removable and replaceable, used to store the recovered titanium powder. On the powder discharge pipe 113, a first valve 151 and a second valve 152 are sequentially arranged from top to bottom, forming a valve group 15. By controlling the opening and closing sequence of these two valves (e.g., opening the upper valve first and then the lower valve during powder discharge), a lock-hopper discharge is achieved, which is crucial for the recovery of flammable and explosive titanium powder.

[0037] Furthermore, to address the issues of bridging or material buildup at the powder discharge port, a gas fluidizing ring 17 is installed inside the filter tank 11 and above the inlet of the powder discharge pipe 113. The gas fluidizing ring 17 is an annular tubular structure with numerous evenly distributed air holes 171. This ring is connected to an external inert gas supply unit via a gas supply pipeline and is electrically connected to the central controller. During the powder discharge stage, the gas fluidizing ring 17 continuously injects fluidizing gas into the powder layer above the discharge inlet, causing the previously accumulated powder layer to enter a "boiling" fluidized state. This significantly improves the powder's flowability, ensuring smooth entry into the powder discharge pipe 113 and completely resolving the problem of poor discharge caused by the poor flowability of titanium powder.

[0038] Furthermore, this embodiment also includes a sensor group 18, which includes a differential pressure sensor 181 connected across the inner and outer sides of the annular filter screen 12, a dust concentration sensor 182 installed at the top of the filter tank 11 or at the dust discharge pipe 113, and a temperature sensor 183 installed at key locations (such as bearings or dust accumulation areas) of the filter tank 11. These sensors transmit real-time monitored signals to the central controller.

[0039] The central controller, acting as the "brain" of the entire system, incorporates adaptive backflushing control logic. Based on the real-time resistance data or its changing trend monitored by the differential pressure sensor 181, it automatically determines the optimal time for dust removal and controls the rotary jet backflushing module 13 to start on-demand backflushing, thus avoiding energy waste caused by traditional timed backflushing or filter clogging caused by untimely backflushing.

[0040] Example 2 This embodiment provides a titanium powder recovery method. The method utilizes the titanium powder filtration and recovery system described in Embodiment 1 to achieve fully automated and intelligent dust recovery. Specifically, it includes the following steps: S1: Normal filtration phase Inert gas (such as argon) containing titanium powder is continuously introduced into the powder-containing gas chamber of the filter tank through the inlet pipe. Under the action of airflow pressure, the gas passes through the vertically set annular filter screen. The titanium powder particles are efficiently intercepted and adsorbed on the outer surface of the annular filter screen, while the filtered clean inert gas enters the inert gas channel in the hollow part of the annular filter screen and is finally discharged from the outlet pipe at the top, realizing gas-solid separation.

[0041] S2: Intelligent Back-blowing Cleaning Stage As filtration progresses, the dust layer on the outer side of the annular filter screen gradually thickens, leading to increased filtration resistance. The central controller monitors these resistance changes in real time using a differential pressure sensor. When the resistance reaches a preset threshold or shows an upward trend, the central controller determines that dust removal is necessary. At this point, the central controller issues a command to first close the valve assemblies on the inlet and outlet pipes to isolate the airflow and maintain pressure within the tank. Subsequently, the central controller activates the rotary jet backflushing module, driving the explosion-proof motor to rotate the rotary jet nozzle at low speed and activating the high-pressure air source. High-pressure inert gas is ejected through the circumferentially inclined nozzles of the nozzle, forming a dynamic rotating jet that powerfully backflushes the inner surface of the annular filter screen. Under the combined action of the pulsed airflow and filter screen deformation, the dust adhering to the outer surface of the annular filter screen is stripped off and falls back onto the inner wall of the filter tank or slides to the bottom, effectively solving the problem of filter screen clogging.

[0042] S3: Intelligent Powder Removal Stage When backflushing is completed or the preset powder discharge time / volume trigger condition is reached, the central controller executes the intelligent powder discharge program. First, the electromagnetic vibrator on the lower part of the filter tank's outer wall is activated to vibrate the tank at high frequency, loosening the titanium powder accumulated on the tank wall and bottom. Simultaneously, the gas fluidization ring is activated, injecting fluidizing gas into the powder layer above the powder discharge pipe inlet, causing the powder to fluidize. Subsequently, the central controller opens the valve group on the powder discharge pipe according to the preset program, allowing the powder to be smoothly and automatically discharged into the titanium powder recovery box in a quasi-fluid state under the combined action of vibration, fluidization, and gravity. After powder discharge is completed, the valve group is closed, and the vibrator and fluidization ring are stopped.

[0043] S4: Full-process safety monitoring phase Throughout the entire system operation (including filtration, backflushing, and dust removal stages), the sensor array remains operational, continuously monitoring key parameters such as dust concentration and temperature. If the dust concentration sensor detects a leak or abnormal concentration, or the temperature sensor detects an abnormal increase in local temperature (potentially indicating a risk of combustion), the central controller will immediately trigger an emergency shutdown procedure, cutting off the fan power and initiating protective gas charging measures (such as filling the tank with a large amount of nitrogen or argon for inert protection). This fundamentally eliminates safety risks caused by human error or monitoring blind spots, ensuring the inherent safety of the entire recycling process.

[0044] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A titanium powder filtration and recovery system, characterized in that, The system includes a basic filtration unit and a central controller. The basic filtration unit includes a filter tank with a sealed hollow cavity and an annular filter screen vertically installed inside the filter tank for filtering titanium powder. The annular filter screen divides the hollow cavity into an external powder-containing gas chamber and an inert gas channel located in the hollow portion of the annular filter screen. One side of the filter tank has an inlet pipe connected to the powder-containing gas chamber for receiving inert gas containing titanium powder. The upper end of the filter tank has an outlet pipe connected to the inert gas channel for discharging clean gas. The channel is equipped with a rotating jet backflushing module for spraying reverse airflow onto the inner surface of the annular filter screen; the bottom of the filter tank is also equipped with a powder discharge pipe and a titanium powder recovery box connected to the powder discharge pipe; the powder discharge pipe is equipped with a valve group for opening or closing its internal channels; an electromagnetic vibrator is also installed on the outer wall of the lower part of the filter tank for driving the titanium powder under backflushing to fall off the inner wall of the filter tank and slide towards the powder discharge pipe; the rotating jet backflushing module, the valve group and the electromagnetic vibrator are all electrically connected to and controlled by the central controller.

2. The titanium powder filtration and recovery system according to claim 1, characterized in that, Inside the filter tank and above the powder discharge pipe inlet, there is a gas fluidizing ring electrically connected to the central controller, which is used to inject fluidizing gas into the powder layer above the powder discharge pipe inlet to make the powder fluidized.

3. The titanium powder filtration and recovery system according to claim 1 or 2, characterized in that, The rotary jet backflushing module includes a rotary jet nozzle extending into the inert gas channel; the connecting end of the rotary jet nozzle passes through the top of the filter tank and is driven by a gear transmission assembly meshing with a drive gear on the output shaft of an explosion-proof motor located at the top of the outer side of the filter tank; the end of the rotary jet nozzle extending into the inert gas channel has several nozzles circumferentially opened, and the explosion-proof motor drives the rotary jet nozzle to rotate, so that the high-pressure inert gas passes through the nozzles to form a pulsed rotary jet that cleans the inner surface of the annular filter screen.

4. The titanium powder filtration and recovery system according to claim 1, characterized in that, The valve assembly includes a first valve and a second valve arranged sequentially from top to bottom along the powder discharge pipe, and a titanium powder recovery box is connected to the end of the powder discharge pipe via a flange.

5. The titanium powder filtration and recovery system according to claim 2, characterized in that, The gas fluidizing ring is an annular tubular structure with a densely distributed number of uniformly distributed air holes. The gas fluidizing ring is connected to an external inert gas supply unit through a gas supply pipeline and is used to inject fluidizing gas into the powder layer above the powder discharge pipe inlet.

6. The titanium powder filtration and recovery system according to any one of claims 1-2 and 4-5, characterized in that, It also includes a sensor group, which includes a differential pressure sensor connected across the inside and outside of the annular filter screen, a dust concentration sensor installed on the top of the filter tank or at the dust discharge pipe, and a temperature sensor installed on the filter tank. The sensor group transmits monitoring signals to the central controller.

7. The titanium powder filtration and recovery system according to claim 6, characterized in that, The central controller has built-in adaptive backflushing control logic. Based on the real-time resistance data or its changing trend monitored by the differential pressure sensor, it automatically determines the best time for backflushing and controls the rotating jet backflushing module to start backflushing as needed.

8. The titanium powder filtration and recovery system according to claim 1, characterized in that, The annular filter screen is formed by folding and wrapping high-temperature resistant metal sintered sheets or filter sheets in sequence.

9. The titanium powder filtration and recovery system according to claim 1, characterized in that, The titanium powder recovery box is a sealed storage tank that is detachably connected to the powder discharge pipe.

10. A method for recovering titanium powder, using the titanium powder filtration and recovery system as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Inert gas containing titanium powder enters the powder-containing gas chamber of the filter tank through the inlet pipe. After being filtered by the annular filter screen, the titanium powder is filtered onto the outer surface of the annular filter screen. The clean inert gas enters the inert gas channel and is discharged from the outlet pipe. S2: According to the backflush instruction, the central controller closes the air intake pipe and the dust discharge pipe, starts the rotary jet backflush module, drives its nozzle to rotate at low speed and sprays high-pressure inert gas to form a dynamic rotary jet to backflush the inner surface of the annular filter screen, so that the dust attached to the outer surface of the filter screen falls back onto the inner wall of the filter tank or the bottom of the tank. S3: When the powder discharge trigger condition is met, the central controller executes the intelligent powder discharge program: the electromagnetic vibrator is started to loosen the powder, and then the valve group on the powder discharge pipeline is opened according to the preset program, so that the powder is automatically discharged into the recycling box in a quasi-fluid state under the action of vibration. S4: During the entire operation, dust concentration and temperature are monitored in real time. If the values ​​are abnormal, an emergency shutdown and protective gas charging measures will be triggered immediately.

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