Powder storage equipment and control method thereof

Abstract

The invention discloses powder storage equipment and a control method thereof.Based on the fact that a first valve is additionally arranged between a powder storage tank and a filtering device of the powder storage equipment, back flushing of the powder storage equipment after feeding is controlled, and the control method comprises the following steps that after feeding is finished, the first valve is controlled to be switched from an open state to a closed state, and the first valve is switched from a closed state to a closed state; the back flushing device is controlled to be switched from a closed state to an open state; the reverse blowing device is used for carrying out air blowing operation on the filter element in the filter device, so that powder on the filter element is blown off towards the direction of the first valve; and after back flushing is finished, the back flushing device is closed, and the first valve is controlled to recover the open state. The electronic controllable valve between the powder storage tank and the filtering device is controlled to be closed in the back flushing stage, so that back flushing airflow cannot carry powder on the filter element to float in the powder storage tank, the explosion risk of the powder is reduced, and the explosion-proof requirement that no explosion-proof valve or explosion venting piece is allowed to be installed is met.

Description

Technical Field

[0001] The invention relates to the field of pneumatic conveying, and in particular to a powder storage device and a control method thereof. Background Art

[0002] Due to environmental requirements and worker health reasons, powders, especially micro-powders, are transported by pneumatic conveying to reduce dust pollution. The closed conveying method of the pneumatic conveying system can effectively prevent the powder from flying, and at the same time prevent water vapor, impurities, etc. from mixing into the material, and can also reduce labor costs and achieve a high degree of automation.

[0003] Currently, a powder conveying tank is provided with a respirator for balancing the airflow, and a filter element is provided inside the respirator to absorb the powder to prevent it from flying outside the tank. Over time, the filter element will be filled with powder and the airflow inside and outside the powder conveying tank will lose balance.

[0004] In order to reduce the frequency of filter element replacement, a solution is proposed to backflush the filter element after feeding is completed. During the backflush stage, the powder is mixed with the gas with a higher pressure and suspended in the upper space inside the tank; typically, it is necessary to install an explosion-proof valve or explosion-proof disc on the outside of the powder storage tank or on the feed pipeline to meet the explosion-proof requirements.

[0005] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present application. It does not necessarily belong to the prior art of the present application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above content has been disclosed before the filing date of the present application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] The object of the present invention is to provide a powder material storage device which can be back-blown and explosion-proof without the need for setting an explosion-proof valve or an explosion-relief plate.

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

[0008] A powder storage device comprises a powder storage tank and a filtering device, wherein the filtering device is arranged on the powder storage tank, and the filtering device comprises a housing and a filter element arranged inside the housing; the powder storage device further comprises:

[0009] A first valve, which is disposed between the filter element and the powder storage tank, and is configured to control the housing of the filter device to be connected to or isolated from the powder storage tank;

[0010] A second valve is arranged on a side of the filter element away from the powder storage tank, and is configured to control the connection or isolation between the housing of the filter device and the back-blowing 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 material storage device is in the feeding stage, the first valve is controlled to be opened, and the second valve is controlled to be closed;

[0013] When the feeding stage of the powder material storage device is finished, the first valve is controlled to be closed, and after the second valve is controlled to be open for a period of time, the second valve is controlled to be closed, and the first valve is controlled to be opened.

[0014] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the volume of the filtering device is less than or equal to 200 ml, and the powder storage device is not provided with an explosion-proof device or an explosion-relief device;

[0015] Alternatively, the volume of the filter device is greater than 200 ml, the powder storage tank is not provided with an explosion-proof device or an explosion-relief device, and the filter device is provided with an explosion-proof device or an explosion-relief device or is subjected to explosion-proof treatment;

[0016] Alternatively, the number of the filter devices is multiple, the volume of each filter device does not exceed 200 ml, and the powder storage device is not provided with an explosion-proof device or an explosion-relief device;

[0017] Alternatively, there are multiple filtering devices, and the volume of some or all of the filtering devices exceeds 200ml. The powder storage tank is not equipped with an explosion-proof device or an explosion-relief device, and the filtering devices exceeding 200ml are equipped with an explosion-proof device or an explosion-relief device or are explosion-proofed.

[0018] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the powder storage tank includes a tank body and a tank cover, and the filtering device is arranged on the tank cover;

[0019] And / or, the powder storage tank is further provided with at least one feed inlet, and the powder storage device sucks the powder into the powder storage tank through the feed inlet by the vacuum principle.

[0020] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, the second valve is arranged outside the filtering device, the inlet of the second valve is configured to be connected to the back-blowing gas source, and the outlet thereof is connected to the housing through a blowing pipe;

[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 powder particle size.

[0022] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the back-blowing gas source is an air bag configured to store compressed gas, and the air bag is provided with an air intake pipeline and an air intake valve arranged on the air intake pipeline; and,

[0023] The air bag is also provided with an exhaust valve and / or a sewage valve arranged at the bottom of the air bag.

[0024] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the powder storage device provided by the present invention also includes a stirring device, the stirring device includes a shaft, a stirring fan blade arranged on the shaft, and a power mechanism for driving the shaft to rotate;

[0025] The shaft rod is arranged in the powder storage tank, and the powder storage tank is provided with an opening, and the output shaft of the power mechanism is linkedly connected with the shaft rod through the opening.

[0026] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the filter element of the filter device includes a proximal core body, a middle core body and a distal core body, and the proximal core body is closer to the first valve than the distal core body;

[0027] The outer diameter of the filter element shows a trend of first contraction and then expansion in the direction from the proximal core body to the middle core body, and the outer diameter shows a trend of approximately contraction in the direction from the middle core body to the distal core body.

[0028] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the powder storage tank is a metering tank;

[0029] Alternatively, the powder storage tank is a feeding tank, the bottom of which is connected to a feeding pipeline via a feeding valve.

[0030] According to another aspect of the present invention, the present invention provides a control method for a powder storage device, which controls the backflush of the powder storage device after feeding is completed, comprising the following steps:

[0031] A first valve is added between the powder storage tank and the filter device of the powder storage device, and is configured to control the connection or isolation between the filter device and the powder storage tank;

[0032] After the feeding is completed, the first valve is controlled to switch from an open state to a closed state, and the backflush device is controlled to switch from a closed state to an open state;

[0033] The back-blowing device performs an air blowing operation on the filter element in the filter device, so that the powder on the filter element is blown off in the direction of the first valve;

[0034] After the backflush is completed, the backflush device is closed, and the first valve is controlled to resume an open state.

[0035] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the powder storage tank is a feeding tank, and the control method further includes feeding control of the powder storage device:

[0036] Firstly, the first valve is controlled to switch to a closed state, and then the feeding pipeline is controlled to be connected.

[0037] The beneficial effects brought by the technical solution provided by the present 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 back-blowing stage, the back-blowing airflow will not carry the powder on the filter element to float in the powder storage tank, reducing the risk of powder explosion and meeting the explosion-proof requirements that do not allow the installation of explosion-proof valves or explosion-proof discs;

[0039] b. Control the duty cycle of the electromagnetic pulse valve of the back-blowing device according to the particle size of the powder, while ensuring the back-blowing effect and efficiency, 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 escape is reduced and the effect of back-blowing the filter element is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

[0045] Figure 4 A schematic structural diagram of a filter device connected to a back-blowing gas source provided by an exemplary embodiment of the present invention;

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

[0047] Figure 6A flow chart of a control method for a powder material storage device provided for an exemplary embodiment of the present invention.

[0048] Among them, the figure marks include: 100-powder storage tank, 110-tank body, 120-tank cover, 130-feed port, 200-filter device, 210-shell, 220-filter element, 222-proximal core, 224-middle core, 226-distal core, 310-first valve, 320-second valve, 330-feeding valve, 410-backblowing air source, 420-blow pipe, 430-intake pipe, 440-intake valve, 450-exhaust valve, 460-drain valve, 510-shaft rod, 520-power mechanism. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0051] In one embodiment of the present invention, a powder storage device is provided. 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 arranged on the powder storage tank 100, and the filter device 200 includes a housing 210 and a filter element 220 arranged inside the housing 210. Figure 2 As shown, the filter device 200 is vertically arranged on the upper end surface of the powder storage tank 100, and can also be inclined at a certain angle, or vertically arranged on the upper part of the side wall of the powder storage tank.

[0052] Taking the filter device 200 disposed on the upper end surface of the powder storage tank 100 as an example, 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 upper end opening, and the tank cover 120 is disposed at the upper end opening of the tank body 110. Figure 3 As shown, at least one feed port 130 is further provided on the tank cover 120 , and the powder storage device sucks the powder into the tank body 110 through the feed port 130 by the vacuum principle.

[0053] The filtering device 200 is disposed on the tank cover 120. Figure 2 As shown, the filter device 200 can be vertically arranged on the tank cover 120 .

[0054] The powder storage device also includes:

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

[0056] A second valve 320 , which is disposed on a 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 back-blowing gas source 410 ;

[0057] In addition, the device also includes a feed valve (not shown) arranged at the feed port 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, that is, the feeding valve is in an open state under the control of the control module, the first valve 310 is controlled to be opened, and the second valve 320 is controlled to be closed (that is, the back-blowing gas 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 end surface of the filter device 200 has a filter screen, so the filter device 200 is also commonly known as a breathing tank, which is used to balance the internal and external air pressures of the powder storage tank 100; in 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, prevent the powder to be stored in the tank body 110 from leaving the powder storage device, and at this time, the backblowing function of the device is turned off.

[0060] When the feeding stage of the powder storage device is finished, the first valve 310 is controlled to be closed, and after the second valve 320 is controlled to be opened for a period of time, the second valve 320 is controlled to be closed, and the first valve 310 is controlled to be opened: that is, the control module controls the feeding valve to be closed in response to the instruction to stop feeding, and then the back-blowing function of the device can be turned on. At this time, the first valve 310 is closed first, and then the second valve 320 is opened, that is, the back-blowing gas source 410 is connected, so that the powder adsorbed on the filter element 220 of the filter module 200 can be blown off and fall onto the first valve 310 under the action of gravity. In one embodiment, the back-blowing timer is pre-set by a program, for example, the second valve is controlled to be closed after 30 seconds of back-blowing. In this case, the first valve 310 is opened, so that the powder accumulated on the first valve 310 can fall into the tank body 110. Since the first valve 310 isolates the filter device 200 from the powder storage tank 100 during the back-blowing process, the powder is only blown off in the housing 210 of the filter device 200, and no dust explosion occurs, thereby improving the back-blowing safety of the powder storage device.

[0061] In a specific embodiment, the volume of the filter device 200 is less than or equal to 200 ml; this volume meets the explosion-proof safety volume. Therefore, the powder storage device (powder storage tank 100 and filter device 200) is allowed to be without an explosion-proof device (such as an explosion-proof valve) or an explosion-relief device (such as an explosion-relief plate), and no explosion-proof treatment is required, which greatly reduces the explosion-proof cost.

[0062] The required volume of the filter device 200 is usually designed according to the size of the powder storage tank. If the required volume of the filter device 200 exceeds 200 ml, such as 450 ml, there are several ways to record it:

[0063] Method 1: a single 450ml filter device 200 is provided, and an explosion-proof device or an explosion-relief device is provided on the filter device 200, or explosion-proof treatment is performed on the filter device 200; while the powder storage tank 100 is not provided with an explosion-proof device or an explosion-relief device, and explosion-proof treatment is not required;

[0064] Method 2: three 150ml filter devices 200 are provided, and each filter device 200 is correspondingly provided with a backflush device, and a first valve 310 is provided between the filter element 220 of each filter device 200 and the powder storage tank 100. The powder storage device (powder storage tank 100 and filter device 200) is not provided with an explosion-proof device or an explosion-relief device, and explosion-proof treatment is not required;

[0065] Method three: a 200ml first filter device is provided, a 250ml second filter device is provided, an explosion-proof device or an explosion-relief device is provided on the second filter device, or explosion-proof treatment is performed on the second filter device; and the powder storage tank 100 is not provided with an explosion-proof device or an explosion-relief device, and does not need to be explosion-proof treated.

[0066] In a 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 back-blowing gas source 410, and the outlet thereof is connected to the housing 210 through a blow pipe 420. Figure 4 As shown, the back-blowing gas source 410 is an air bag configured to store compressed gas, and the air bag is provided with an air inlet pipe 430 and an air inlet valve 440 arranged on the air inlet pipe 430; further, the air bag can also be provided with an exhaust valve 450 and a drain valve 460 arranged at the bottom of the air bag.

[0067] When the back-blowing function is turned on, the second valve 320 and the air inlet valve 440 are opened, and the first valve 310, the exhaust valve 450, and the drain valve 460 are all closed; if the back-blowing function is not used for a long time, the gas in the air bag needs to be discharged. At this time, the exhaust valve 450 is opened, and the second valve 320, the air inlet valve 440, and the drain valve 460 are all closed; since compressed air usually contains moisture, the accumulated sewage can be discharged by opening the drain valve 460 and closing the second valve 320, the air inlet valve 440, and the exhaust valve 450.

[0068] In a 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, and the duty cycle of the electromagnetic pulse valve is set according to the pre-sampled powder particle size: 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 too small powder from being secondary adsorbed by the filter element 220 during the backblowing process; 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% accordingly.

[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, a stirring fan blade arranged on the shaft 510, and a power mechanism 520 for driving the shaft to rotate; the shaft 510 is arranged in the tank body 110, and an opening is provided on the tank cover 120, and the output shaft of the power mechanism 520 is connected to the shaft 510 in a linked manner through the opening, and the stirring device is used to prevent the powder from agglomerating in the tank body 110 and blocking the feeding channel.

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

[0071] The outer diameter of the filter element 220 shows a trend of first contraction and then expansion in the direction from the proximal core 222 to the middle core 224, and its outer diameter shows a trend of contraction 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 the internal filter channel is also straight; the middle section core 224 is in a small waist shape, and the distal core 226 is slightly in an eight-shaped shape, and the internal filter channel matches the outer contour accordingly. Such a filter element design allows, on the one hand, when filtering powder, the proximal core 222 can be used to absorb most of the powder more smoothly, and the upper part of the small waist shape of the middle section core 224 and the eight-shaped structure of the distal core 226 can be used to prevent the powder from continuing to rise and detach from the filter element 220, thereby reducing the risk of powder escaping; on the other hand, during the back-blowing process, the small waist shape of the middle section core 224 is used to further increase the pressure and increase the flow rate in the filter channel of the proximal core 222, so that when the airflow reaches the proximal core 222 from top to bottom, it is easier to blow off the accumulated powder adhering to its surface, thereby saving the back-blowing airflow and improving the back-blowing efficiency.

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

[0073] The powder storage tank 100 in the present invention can be a metering tank or a feeding tank, and its bottom is connected to the feeding pipeline through a feeding valve 330; the control module is also configured to perform the following control operations: when or before controlling the feeding valve 330 to open, the first valve 310 is controlled to be closed, that is, when the control module responds to the feeding instruction, the first valve 310 is first closed, and then the feeding valve 330 is opened. Since the first valve 310 is closed to isolate the tank body 110 from the filter device 200, during the feeding process, no gas will enter the tank body 110 through the shell 210 of the filter device 200, thereby eliminating the safety hazard of dust mixing with air above the inside of the tank body 110 and exploding.

[0074] In one embodiment of the present invention, a control method for a powder storage device is provided to control the backflush of the powder storage device after the feeding 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 of the powder storage device, and is configured to control the connection or isolation between the filter device and the powder storage tank;

[0076] If the control module receives a feed instruction, it controls the first valve to open and the backflush device to close; then it opens the feed valve to start feeding;

[0077] If the control module receives a stop feeding instruction afterwards, the feed valve is controlled to close, that is, the positioning feed has ended;

[0078] After the feeding is completed, the first valve is controlled to switch from an open state to a closed state, and the backflush device is controlled to switch from a closed state to an open state;

[0079] The back-blowing device performs an air blowing operation on the filter element in the filter device, so that the powder on the filter element is blown off in the direction of the first valve;

[0080] After the backflush is finished (for example, the backflush timer reaches 30 seconds), the backflush device is closed, and the first valve is controlled to resume the open state.

[0081] For the embodiment in which the powder storage tank is a feeding tank, the control method further includes performing feeding control on the powder storage device:

[0082] If the control module receives a feeding instruction, it first controls the first valve to switch to a closed state, and then controls the feeding valve to open so that the feeding pipeline is conductive.

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

[0084] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0085] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A powder storage device, characterized in that: The invention comprises a powder storage tank (100) and a filter device (200), wherein the filter device (200) is arranged on the powder storage tank (100), and the filter device (200) comprises a housing (210) and a filter element (220) arranged inside the housing (210); the powder storage device further comprises: a first valve (310), which is disposed between the filter element (220) and the powder storage tank (100), and is configured to control the communication or isolation between the housing (210) of the filter device (200) and the powder storage tank (100); a second valve (320), which is arranged on a side of the filter element (220) away from the powder storage tank (100), and is configured to control the connection or isolation between the housing (210) of the filter device (200) and the back-blowing gas source (410); The powder storage device further comprises 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 material storage device is in the feeding stage, the first valve (310) is controlled to be opened, and the second valve (320) is controlled to be closed; When the feeding stage of the powder storage device ends, the first valve (310) is controlled to be closed, and after the second valve (320) is controlled to be open for a period of time, the second valve (320) is controlled to be closed, and the first valve (310) is controlled to be opened.

2. The powder storage device according to claim 1, characterized in that: The volume of the filtering device (200) is less than or equal to 200 ml, and the powder storage device is not provided with an explosion-proof device or an explosion-relief device; Alternatively, the volume of the filter device (200) is greater than 200 ml, the powder storage tank (100) is not provided with an explosion-proof device or an explosion-relief device, and the filter device (200) is provided with an explosion-proof device or an explosion-relief device or is subjected to explosion-proof treatment; Alternatively, the number of the filtering devices (200) is multiple, the volume of each filtering device (200) does not exceed 200 ml, and the powder storage device is not provided with an explosion-proof device or an explosion-relief device; Alternatively, the number of the filter devices (200) is plural, the volume of some or all of the filter devices (200) exceeds 200 ml, the powder storage tank (100) is not provided with an explosion-proof device or an explosion-relief device, and the filter devices (200) exceeding 200 ml are provided with an explosion-proof device or an explosion-relief device or are subjected to explosion-proof treatment.

3. The powder storage device according to claim 1, characterized in that: The powder storage tank (100) comprises a tank body (110) and a tank cover (120), and the filtering device (200) is arranged on the tank cover (120); And / or, the powder storage tank (100) is further provided with at least one feed port (130), and the powder storage device sucks the powder into the powder storage tank (100) through the feed port (130) by using a vacuum principle.

4. The powder storage device according to claim 1, characterized in that: The second valve (320) is arranged outside the filtering device (200), the inlet of the second valve (320) is configured to be connected to the back-blowing gas source (410), and the outlet thereof is connected to the housing (210) through a blowing 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 powder particle size.

5. The powder material storage device according to claim 1, characterized in that: The back-blowing gas source (410) is an air bag configured to store compressed gas, the air bag is provided with an air intake valve (440) for connecting to an air intake pipeline (430) and arranged on the air intake pipeline (430); and, The air bag is also provided with an exhaust valve (450) and / or a sewage discharge valve (460) arranged at the bottom of the air bag.

6. The powder storage device according to claim 1, characterized in that: Also included is a stirring device, the stirring device comprising a shaft (510), a stirring blade disposed on the shaft (510), and a power mechanism (520) for driving the shaft to rotate; The shaft (510) is disposed in the powder storage tank (100), and an opening is provided on the powder storage tank (100), and the output shaft of the power mechanism (520) is linked to the shaft (510) through the opening.

7. The powder storage device according to claim 1, characterized in that: The filter element (220) of the filter device (200) comprises a proximal core body (222), a middle core body (224) and a distal core body (226), wherein the proximal core body (222) is closer to the first valve (310) than the distal core body (226); The outer diameter of the filter element (220) shows a trend of first contraction and then expansion in the direction from the proximal core body (222) to the middle section core body (224), and its outer diameter shows a trend of roughly contraction in the direction from the middle section core body (224) to the distal core body (226).

8. The powder material storage device according to any one of claims 1 to 7, characterized in that: The powder storage tank (100) is a metering tank; Alternatively, the powder storage tank (100) is a feeding tank, the bottom of which is connected to a feeding pipeline via a feeding valve (330).

9. A method for controlling a powder storage device, which controls the backflush of the powder storage device after feeding is completed, characterized in that: The following steps are involved: A first valve is added between the powder storage tank and the filter device of the powder storage device, and the first valve is configured to control the connection or isolation between the filter device and the powder storage tank; After the feeding is completed, the first valve is controlled to switch from an open state to a closed state, and the backflush device is controlled to switch from a closed state to an open state; The back-blowing device performs an air blowing operation on the filter element in the filter device, so that the powder on the filter element is blown off in the direction of the first valve; After the backflush is completed, the backflush device is closed, and the first valve is controlled to resume an open state.

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

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