Powder storage device and control method thereof

Abstract

This invention discloses a powder storage device and its control method. Based on adding a first valve between the powder storage tank and the filter device, the backflushing of the powder storage device after feeding is controlled. The method includes the following steps: after feeding, the first valve is controlled to switch from an open state to a closed state, and the backflushing device is controlled to switch from a closed state to an open state; the backflushing device performs an air blowing operation on the filter element in the filter device, causing the powder on the filter element to be blown off towards the first valve; after backflushing is completed, the backflushing device is closed, and the first valve is controlled to return to an open state. This invention, by controlling the electronically controllable valve between the powder storage tank and the filter device to close during the backflushing stage, prevents the backflushing airflow from carrying powder from the filter element into the powder storage tank, reducing the risk of powder explosion and meeting the explosion-proof requirements that allow for the absence of explosion-proof valves or venting discs.

Description

Technical Field

[0001] This invention relates to the field of pneumatic conveying, and more particularly to a powder storage device and its control method. Background Technology

[0002] Due to environmental requirements and worker health considerations, pneumatic conveying is widely used for transporting powders, especially fine powders, to reduce dust pollution. The enclosed conveying system of pneumatic conveying effectively prevents powder from flying away, prevents moisture and impurities from mixing into the material, reduces labor costs, and achieves a high degree of automation.

[0003] Currently, powder conveying tanks are equipped with breathers to balance airflow. These breathers contain filters to absorb powder and prevent it from flying outside the tank. Over time, the filters become filled with powder, causing an imbalance in airflow inside and outside the powder conveying tank.

[0004] To reduce the frequency of filter element replacement, a solution of backflushing the filter element after feeding is proposed. During the backflushing stage, the powder is mixed with high-pressure gas and suspended in the upper space inside the tank; typically, explosion-proof valves or explosion relief discs need to be installed on the outside of the powder storage tank or on the feed pipe to meet explosion-proof requirements.

[0005] The above background information is provided only to aid in understanding the concept and technical solution of this application. It does not necessarily belong to the prior art of this application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above information was disclosed before the filing date of this application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of this invention is to provide a powder storage device that can be backflushed for explosion protection without the need for explosion-proof valves or explosion relief discs.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A powder storage device includes a powder storage tank and a filtration device, wherein the filtration device is disposed on the powder storage tank, and the filtration device includes a housing and a filter element disposed inside the housing; the powder storage device further includes:

[0009] A first valve is disposed between the filter element and the powder storage tank, and is configured to control the connection or isolation between the housing of the filtration device and the powder storage tank;

[0010] The second valve, located on the side of the filter element away from the powder storage tank, is configured to control the connection or isolation of the housing of the filtration device from the backflushing air source.

[0011] The powder storage device further includes a control module for controlling the first valve and the second valve, which is configured to perform the following steps:

[0012] If the powder storage device is in the feeding stage, the first valve is controlled to open and the second valve is controlled to close.

[0013] After the feeding stage of the powder storage device is completed, the first valve is controlled to close, and after the second valve is controlled to open for a period of time, the second valve is controlled to close, and the first valve is controlled to open.

[0014] Furthermore, in accordance with any or a combination of the aforementioned technical solutions, the volume of the filtration device is less than or equal to 200ml, and the powder storage device is not equipped with an explosion-proof device or an explosion-venting device.

[0015] Alternatively, the volume of the filter device is greater than 200ml, the powder storage tank is not equipped with an explosion-proof device or an explosion-proof device, and the filter device is equipped with an explosion-proof device or an explosion-proof device or is treated with explosion-proof measures.

[0016] Alternatively, there may be multiple filtration devices, each with a volume not exceeding 200ml, and the powder storage device may not be equipped with an explosion-proof device or an explosion-venting device.

[0017] Alternatively, the number of the filter devices may be multiple, and the volume of some or all of the filter devices may exceed 200ml. The powder storage tank may not be equipped with an explosion-proof device or an explosion-proof device, while the filter devices exceeding 200ml may be equipped with an explosion-proof device or an explosion-proof device or be treated with explosion-proof measures.

[0018] Furthermore, based on any or a combination of the aforementioned technical solutions, the powder storage tank includes a tank body and a tank cover, and the filter device is disposed on the tank cover;

[0019] And / or, the powder storage tank is also provided with at least one feed inlet, and the powder storage device draws the powder into the powder storage tank through the feed inlet by means of a vacuum principle.

[0020] Furthermore, following any or a combination of the aforementioned technical solutions, the second valve is disposed outside the filter device, the inlet of the second valve is configured to be connected to the backflush air source, and its outlet is connected to the housing through a blowpipe.

[0021] Alternatively, the second valve is an electromagnetic pulse valve, and the duty cycle of the electromagnetic pulse valve is set according to the pre-sampled particle size of the powder.

[0022] Furthermore, following any one or a combination of the aforementioned technical solutions, the backflush air source is an air tank configured to store compressed gas, the air tank having an inlet pipe and an inlet valve disposed on the inlet pipe; and,

[0023] The air chamber is also equipped with an exhaust valve and / or a drain valve located at the bottom of the air chamber.

[0024] Furthermore, based on any or a combination of the aforementioned technical solutions, the powder storage device provided by the present invention further includes a stirring device, the stirring device including a shaft, stirring blades disposed on the shaft, and a power mechanism for driving the shaft to rotate;

[0025] The shaft is disposed inside the powder storage tank, and the powder storage tank has an opening. The output shaft of the power mechanism is connected to the shaft through the opening.

[0026] Furthermore, based on any or a combination of the aforementioned technical solutions, the filter element of the filtration device includes a proximal core, a middle core, and a distal core, wherein the proximal core is closer to the first valve than the distal core.

[0027] The outer diameter of the filter element shows a tendency to first contract and then expand in the direction from the proximal core to the middle core, and its outer diameter shows a general tendency to contract in the direction from the middle core to the distal core.

[0028] Furthermore, based on any or a combination of the aforementioned technical solutions, the powder storage tank is a metering tank;

[0029] Alternatively, the powder storage tank may be a feeding tank, with its bottom connected to a feeding pipeline via a feeding valve.

[0030] According to another aspect of the present invention, a control method for a powder storage device is provided to control the backflushing of the powder storage device after feeding, comprising the following steps:

[0031] A first valve is added between the powder storage tank and the filter device in the powder storage equipment, which is configured to control the connection or isolation between the filter device and the powder storage tank.

[0032] After feeding is completed, the first valve is controlled to switch from the open state to the closed state, and the backflushing device is controlled to switch from the closed state to the open state.

[0033] The back-blowing device performs an air-blowing operation on the filter element in the filter device, causing the powder on the filter element to be blown off towards the first valve.

[0034] After the backflushing is completed, the backflushing device is shut down, and the first valve is controlled to return to the open state.

[0035] Furthermore, following any one or a combination of the aforementioned technical solutions, the powder storage tank is a feeding tank, and the control method further includes feeding control of the powder storage device:

[0036] First, control the first valve to switch to the closed state, and then control the feeding pipeline to be opened.

[0037] The beneficial effects of the technical solution provided by this invention are as follows:

[0038] a. By controlling the electronically controllable valve between the powder storage tank and the filter device to close during the backflushing stage, the backflushing airflow will not carry the powder on the filter element into the powder storage tank, reducing the risk of powder explosion and meeting the explosion-proof requirements that allow the absence of explosion-proof valves or explosion relief discs.

[0039] b. Control the duty cycle of the electromagnetic pulse valve of the backflushing device according to the particle size of the powder, so as to ensure the backflushing effect and efficiency while taking into account the service life of the electromagnetic pulse valve.

[0040] c. By improving the structural design of the filter element, the probability of powder leakage is reduced, while the effect of backflushing the filter element is improved. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A perspective view of a powder storage device provided as an exemplary embodiment of the present invention;

[0043] Figure 2 A cross-sectional schematic diagram of a powder storage device provided as an exemplary embodiment of the present invention;

[0044] Figure 3 A top view of a powder storage device provided as an exemplary embodiment of the present invention;

[0045] Figure 4 A schematic diagram of a filter device connected to a backflush air source, provided as an exemplary embodiment of the present invention;

[0046] Figure 5 A schematic diagram of the filter element structure of a filtration device provided in an exemplary embodiment of the present invention;

[0047] Figure 6A flowchart illustrating a control method for a powder storage device provided as an exemplary embodiment of the present invention.

[0048] The reference numerals in the attached drawings include: 100-powder storage tank, 110-tank body, 120-tank cover, 130-feed inlet, 200-filter device, 210-shell, 220-filter element, 222-proximal core, 224-intermediate core, 226-distal core, 310-first valve, 320-second valve, 330-feeding valve, 410-backflush air source, 420-blowpipe, 430-air inlet pipe, 440-air inlet valve, 450-exhaust valve, 460-drain valve, 510-shaft, 520-power mechanism. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0051] In one embodiment of the present invention, a powder storage device is provided, see [link to relevant documentation]. Figure 1 and Figure 2 The powder storage device includes a powder storage tank 100 and a filter device 200, wherein the filter device 200 is disposed on the powder storage tank 100, and the filter device 200 includes a housing 210 and a filter element 220 disposed inside the housing 210. This invention is not limited to... Figure 2 The filter device 200 can be vertically installed on the upper surface of the powder storage tank 100 as shown, or it can be tilted at a certain angle, or vertically installed on the upper part of the side wall of the powder storage tank.

[0052] Taking the example of the filter device 200 being installed on the upper surface of the powder storage tank 100, in a specific embodiment of the present invention, the powder storage tank 100 includes a tank body 110 and a tank cover 120. The tank body 110 is a container with an open upper end, and the tank cover 120 covers the upper opening of the tank body 110. Figure 3 As shown, the can lid 120 is also provided with at least one feed inlet 130. The powder storage device draws the powder into the can body 110 through the feed inlet 130 by means of vacuuming.

[0053] The filter device 200 is mounted on the can lid 120, such as Figure 2 As shown, the filter device 200 can be vertically mounted on the can lid 120.

[0054] The powder storage device further includes:

[0055] A first valve 310 is disposed between the filter element 220 and the powder storage tank 100, and is configured to control the connection or isolation between the housing 210 of the filtration device 200 and the tank body 110.

[0056] The second valve 320 is located on the side of the filter element 220 away from the powder storage tank 100 and is configured to control the housing 210 of the filter device 200 to be connected to or isolated from the backflush air source 410.

[0057] In addition, the device also includes a feed valve (not shown) located at the feed inlet 130.

[0058] The powder storage device further includes a control module for controlling the first valve 310, the second valve 320, and the feed valve, which is configured to perform the following steps:

[0059] If the powder storage device is in the feeding stage, i.e., the feeding valve is open under the control of the control module, then the first valve 310 is opened and the second valve 320 is closed (i.e., the backflush air source 410 is cut off); at this time, the housing 210 of the filter device 200 and the tank body 110 form a communicating space; see Figure 4 The upper surface of the filter device 200 has a filter screen, so the filter device 200 is also commonly known as a breathing tank. It is used to balance the internal and external air pressure of the powder storage tank 100. During the process of the powder being sucked into the tank body 110 through the feed port 130, the filter element 220 of the filter device 200 can adsorb the powder, that is, while achieving airflow balance, it prevents the powder that should be stored in the tank body 110 from leaving the powder storage device. At this time, the backflushing function of the device is turned off.

[0060] After the feeding stage of the powder storage device is completed, the first valve 310 is closed, and after the second valve 320 has been opened for a period of time, the second valve 320 is closed, and the first valve 310 is opened. That is, the control module responds to the instruction to stop feeding and controls the feeding valve to close. Then, the backflushing function of the device can be activated. At this time, the first valve 310 is closed first, and then the second valve 320 is opened, that is, the backflushing air source 410 is connected. The powder adsorbed on the filter element 220 of the filter module 200 is blown off and falls onto the first valve 310 under the action of gravity. In one embodiment, the backflushing timer is preset by the program, for example, the second valve is closed after 30 seconds of backflushing. In this case, opening the first valve 310 allows the powder accumulated on the first valve 310 to fall into the tank body 110. Since the first valve 310 isolates the filter device 200 from the powder storage tank 100 during the backflushing process, the powder is only blown off inside the housing 210 of the filter device 200, and no dust explosion will occur, thus improving the backflushing safety of the powder storage equipment.

[0061] In one specific embodiment, the volume of the filter device 200 is less than or equal to 200 ml; this volume meets the safety volume for explosion protection. Therefore, the powder storage equipment (powder storage tank 100 and filter device 200) is not required to be equipped with explosion-proof devices (such as explosion-proof valves) or explosion-proof devices (such as explosion-proof discs), and explosion-proof treatment is not required, which greatly reduces the explosion-proof cost.

[0062] The required volume of the filter device 200 is usually designed based on the size of the powder storage tank. If the required volume of the filter device 200 exceeds 200ml, such as 450ml, the following methods can be used:

[0063] Option 1: Install a single 450ml filter device 200, and install an explosion-proof device or explosion-venting device on the filter device 200, or perform explosion-proof treatment on it; while the powder storage tank 100 is not equipped with an explosion-proof device or explosion-venting device, and does not need to be treated for explosion-proof.

[0064] Method 2: Set up three 150ml filter devices 200, and each filter device 200 is equipped with a backflushing device. A first valve 310 is set between the filter element 220 of each filter device 200 and the powder storage tank 100. The powder storage equipment (powder storage tank 100 and filter device 200) is not equipped with explosion-proof devices or explosion-venting devices, and no explosion-proof treatment is required.

[0065] Method 3: Install a 200ml first filter device and a 250ml second filter device. Install an explosion-proof device or an explosion-proof relief device on the second filter device, or perform explosion-proof treatment on it; while the powder storage tank 100 is not equipped with an explosion-proof device or an explosion-proof relief device, and does not need to be treated for explosion-proof purposes.

[0066] In one specific embodiment, the second valve 320 is disposed outside the filter device 200, the inlet of the second valve 320 is configured to be connected to the backflush air source 410, and its outlet is connected to the housing 210 through a blowpipe 420, such as... Figure 4 As shown, the backflush air source 410 is an air tank configured to store compressed gas. The air tank is provided with an air inlet pipe 430 and an air inlet valve 440 disposed on the air inlet pipe 430. Further, the air tank may also be provided with an exhaust valve 450 and a drain valve 460 disposed at the bottom of the air tank.

[0067] When the backflush function is activated, the second valve 320 and the intake valve 440 are open, while the first valve 310, the exhaust valve 450, and the drain valve 460 are all closed. If the backflush function is not used for a long time, the gas in the air tank needs to be vented. At this time, the exhaust valve 450 is opened, while the second valve 320, the intake valve 440, and the drain valve 460 are all closed. Since compressed air usually contains moisture, the accumulated wastewater can be drained by opening the drain valve 460 and closing the second valve 320, the intake valve 440, and the exhaust valve 450.

[0068] In one specific embodiment, the first valve 310 can be a pneumatic butterfly valve, and the second valve 320 is an electromagnetic pulse valve, specifically a right-angle electromagnetic pulse valve. The duty cycle of the electromagnetic pulse valve is set according to the pre-sampled particle size of the powder: if the average particle size of the powder is less than a certain threshold, such as less than or equal to 75μm, the duty cycle of the electromagnetic pulse valve is controlled to be greater than or equal to 60%, which can effectively prevent excessively small powder from being re-adsorbed by the filter element 220 during backflushing; if the average particle size of the powder is greater than a certain threshold, such as greater than or equal to 0.5mm, the duty cycle of the electromagnetic pulse valve is controlled to be less than or equal to 20%, which can effectively extend the service life of the electromagnetic pulse valve; if the average particle size of the powder is between 75μm and 0.5mm, the duty cycle is set to be between 20% and 60%.

[0069] like Figure 2 As shown, the powder storage device provided by the present invention also includes a stirring device, which includes a shaft 510, stirring blades disposed on the shaft 510, and a power mechanism 520 for driving the shaft to rotate. The shaft 510 is disposed inside the tank body 110, and the tank cover 120 is provided with an opening. The output shaft of the power mechanism 520 is connected to the shaft 510 through the opening. The stirring device is used to prevent the powder from agglomerating inside the tank body 110 and blocking the feeding channel.

[0070] The present invention further modifies the structure of the filter element 220 of the filtration device 200 as follows: Figure 5The improvement shown is that the filter element 220 is divided into three parts from bottom to top: the proximal core 222, the middle core 224, and the distal core 226 (the three parts are an integral structure forming a filtration channel from bottom to top). The proximal core 222 is closer to the first valve 310 than the distal core 226.

[0071] The outer diameter of the filter element 220 exhibits a tendency to first contract and then expand in the direction from the proximal core 222 to the middle core 224, while its outer diameter generally exhibits a tendency to contract in the direction from the middle core 224 to the distal core 226. Figure 5 As shown, the height of the proximal core 222 accounts for more than 50% of the overall height of the filter element 220, its outer diameter remains unchanged, and its internal filtration channels are also straight; the middle core 224 is shaped like a small waist, and the distal core 226 is slightly shaped like an "eight," with its internal filtration channels matching the outer contours. This filter element design allows the proximal core 222 to effectively adsorb most of the powder during filtration, while the small waist-shaped upper part of the middle core 224 and the "eight"-shaped structure of the distal core 226 prevent the powder from rising further and escaping from the filter element 220, reducing the risk of powder escape. Furthermore, during backflushing, the small waist-shaped structure of the middle core 224 further pressurizes the air pressure and increases the flow velocity within the filtration channels of the proximal core 222, making it easier for the airflow to blow off the accumulated powder adhering to its surface when it reaches the proximal core 222 from top to bottom, thus saving backflushing airflow and improving backflushing efficiency.

[0072] Obviously, the present invention does not exclude the possibility that the filter element 220 adopts a structure with the same upper and lower outer diameters.

[0073] The powder storage tank 100 in this invention can be a metering tank or a feeding tank, and its bottom is connected to the feeding pipeline through the feeding valve 330. The control module is also configured to perform the following control operation: when or before the feeding valve 330 is opened, the first valve 310 is closed. That is, when the control module responds to the feeding command, the first valve 310 is closed first, and then the feeding valve 330 is opened. Since the first valve 310 is closed, the tank body 110 is isolated from the filter device 200. Therefore, during the feeding process, no gas will enter the tank body 110 through the shell 210 of the filter device 200, thus eliminating the safety hazard of dust mixing with air inside the tank body 110 and causing an explosion.

[0074] In one embodiment of the present invention, a control method for a powder storage device is provided, which controls the backflushing of the powder storage device after the feeding process is completed, such as... Figure 6 As shown, the control method includes the following steps:

[0075] A first valve is added between the powder storage tank and the filter device in the powder storage equipment, which is configured to control the connection or isolation between the filter device and the powder storage tank.

[0076] If the control module receives a feeding command, it controls the first valve to open and the backflushing device to close; then it opens the feeding valve and begins feeding.

[0077] If the control module receives a stop feeding command later, it will control the feeding valve to close, indicating that the positioning feeding has ended;

[0078] After feeding is completed, the first valve is controlled to switch from the open state to the closed state, and the backflushing device is controlled to switch from the closed state to the open state.

[0079] The back-blowing device performs an air-blowing operation on the filter element in the filter device, causing the powder on the filter element to be blown off towards the first valve.

[0080] After the backflushing is completed (for example, after the backflushing timer reaches 30 seconds), the backflushing device is shut off, and the first valve is controlled to return to the open state.

[0081] In an embodiment where the powder storage tank is a feeding tank, the control method further includes feeding control of the powder storage device:

[0082] If the control module receives a feeding command, it first controls the first valve to switch to the closed state, and then controls the feeding valve to open so that the feeding pipeline can be connected.

[0083] It should be noted that the control method provided in this embodiment and the powder storage device provided in the above embodiments belong to the same inventive concept. Therefore, the entire contents of the powder storage device embodiment are incorporated into this control method embodiment by means of full reference, and will not be repeated here.

[0084] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0085] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A powder storage device, characterized in that, The equipment includes a powder storage tank (100) and a filter device (200), wherein the filter device (200) is disposed on the powder storage tank (100), and the filter device (200) includes a housing (210) and a filter element (220) disposed inside the housing (210); the powder storage equipment further includes: A first valve (310) is disposed between the filter element (220) and the powder storage tank (100), and is configured to control the housing (210) of the filtration device (200) to communicate with or isolate the powder storage tank (100); A second valve (320) is located on the side of the filter element (220) away from the powder storage tank (100) and is configured to control the housing (210) of the filter device (200) to be connected to or isolated from the backflush air source (410); The filter element (220) of the filter device (200) includes a proximal core (222), an intermediate core (224), and a distal core (226), wherein the proximal core (222) is closer to the first valve (310) than the distal core (226); the outer diameter of the filter element (220) first contracts and then expands in the direction from the proximal core (222) to the intermediate core (224), and its outer diameter generally contracts in the direction from the intermediate core (224) to the distal core (226); The powder storage device further includes a control module for controlling the first valve (310) and the second valve (320), which is configured to perform the following steps: If the powder storage device is in the feeding stage, the first valve (310) is controlled to open and the second valve (320) is controlled to close. After the feeding stage of the powder storage device is completed, the first valve (310) is controlled to close, and after the second valve (320) is controlled to open for a period of time, the second valve (320) is controlled to close, and the first valve (310) is controlled to open.

2. The powder storage device according to claim 1, characterized in that, The volume of the filter device (200) is less than or equal to 200ml, and the powder storage device is not equipped with an explosion-proof device or an explosion-venting device. Alternatively, the volume of the filter device (200) is greater than 200ml, the powder storage tank (100) is not equipped with an explosion-proof device or an explosion-proof device, and the filter device (200) is equipped with an explosion-proof device or an explosion-proof device or is treated with explosion protection. Alternatively, there may be multiple filter devices (200), each filter device (200) having a volume not exceeding 200ml, and the powder storage device may not be equipped with an explosion-proof device or an explosion-proof device. Alternatively, the number of the filter devices (200) may be multiple, and some or all of the filter devices (200) may have a volume exceeding 200ml. The powder storage tank (100) may not be equipped with an explosion-proof device or an explosion-proof device, while the filter devices (200) with a volume exceeding 200ml may be equipped with an explosion-proof device or an explosion-proof device or be treated with explosion-proof measures.

3. The powder storage device according to claim 1, characterized in that, The powder storage tank (100) includes a tank body (110) and a tank cover (120), and the filter device (200) is disposed on the tank cover (120); And / or, the powder storage tank (100) is also provided with at least one feed port (130), and the powder storage device draws the powder into the powder storage tank (100) through the feed port (130) by means of vacuum principle.

4. The powder storage device according to claim 1, characterized in that, The second valve (320) is located outside the filter device (200), the inlet of the second valve (320) is configured to be connected to the backflush air source (410), and its outlet is connected to the housing (210) through a blow pipe (420); Alternatively, the second valve (320) is an electromagnetic pulse valve, and the duty cycle of the electromagnetic pulse valve is set according to the pre-sampled particle size of the powder.

5. The powder storage device according to claim 1, characterized in that, The backflush air source (410) is an air tank configured to store compressed gas, the air tank having an inlet pipe (430) for connection and an inlet valve (440) disposed on the inlet pipe (430); and, The air chamber is also provided with an exhaust valve (450) and / or a drain valve (460) located at the bottom of the air chamber.

6. The powder storage device according to claim 1, characterized in that, It also includes a stirring device, which includes a shaft (510), stirring blades disposed on the shaft (510), and a power mechanism (520) for driving the shaft to rotate. The shaft (510) is disposed inside the powder storage tank (100), and the powder storage tank (100) has an opening. The output shaft of the power mechanism (520) is connected to the shaft (510) through the opening.

7. The powder storage device according to any one of claims 1 to 6, characterized in that, The powder storage tank (100) is a metering tank; Alternatively, the powder storage tank (100) may be a feeding tank, with its bottom connected to a feeding pipeline via a feeding valve (330).

8. A control method for a powder storage device as described in any one of claims 1 to 7, wherein backflushing of the powder storage device is controlled after feeding is completed, characterized in that, Includes the following steps: A first valve is added between the powder storage tank and the filter device in the powder storage equipment, which is configured to control the connection or isolation between the filter device and the powder storage tank. After feeding is completed, the first valve is controlled to switch from the open state to the closed state, and the backflushing device is controlled to switch from the closed state to the open state. The back-blowing device performs an air-blowing operation on the filter element in the filter device, causing the powder on the filter element to be blown off towards the first valve. After the backflushing is completed, the backflushing device is shut down, and the first valve is controlled to return to the open state.

9. The control method for the powder storage device according to claim 8, characterized in that, The powder storage tank is a feeding tank, and the control method further includes feeding control of the powder storage device: First, control the first valve to switch to the closed state, and then control the feeding pipeline to be opened.

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