Powder tank powder discharging device

Abstract

The application relates to a powder tank powder discharging device and belongs to the technical field of feeding devices. The device comprises a tank body, the bottom of the tank body is provided with a sandwich layer, the sandwich layer is provided with a through hole coaxial with the tank body, a screen is arranged in the through hole on the upper surface of the sandwich layer, the screen comprises a circular frame and a screen body in the frame, a rotating shaft coaxial with the tank body is arranged in the tank body, a limiting plate is arranged at the bottom of the rotating shaft, the limiting plate is symmetrically arranged on both sides of the rotating shaft and is slidably attached to the inner surfaces of the frame at two positions, and the lower edge of the limiting plate is slidably attached to the upper surface of the screen body. The device has the characteristics of low bonding probability and smooth discharging.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of feeding devices, and particularly relates to a powder tank powder discharging device. BACKGROUND

[0002] In the textile printing and dyeing industry, a powder tank is a device for containing dye powder, and is internally vacuumized. The powder tank generally comprises a tank body, a top cover, a bottom plate and a sealing disc. The top cover is generally fixed by screwing with the tank body. A rotating shaft is arranged inside. The sealing disc is installed at the bottom of the tank body, and a through hole allowing the rotating shaft to pass through is formed in the middle part of the sealing disc. The bottom of the rotating shaft is threaded. The rotating shaft is rotated by a mechanical hand to drive the powder to fall. The powder falls from the bottom of the rotating shaft into the discharge port to realize discharging.

[0003] Generally, the structure of the powder tank, such as the powder feeding device disclosed in Chinese patent CN221215372U, comprises a mounting seat, a powder tank body, a powder tank cover, a feeding shaft and a material leakage port pipe. The powder tank cover is detachably connected to the top end of the powder tank body. The feeding shaft is rotatably connected to the inside of the powder tank body. One end of the feeding shaft penetrates the powder tank cover. The powder tank cover is provided with a first air hole. The inside of the powder tank cover is fixedly connected with an air hole sealing ring at a position corresponding to the first air hole. The end of the feeding shaft close to the powder tank cover is fixedly connected with an air hole ring. The air hole ring is provided with a second air hole. The air hole ring is arranged in abutment with the air hole sealing ring. By arranging the air hole ring on the feeding shaft and linking the first air hole on the powder tank cover, the problem of internal dampening is avoided, and air exchange with the outside can be realized during feeding to avoid the problem of internal vacuumization leading to inability to feed. The sealing performance is good, and the feeding is accurate.

[0004] However, in the above-mentioned scheme, the discharging structure is a threaded rod arranged on the discharge port to drive the powder to fall. However, since the diameter of the discharge port is usually small, blockage is prone to occur, such as powder accumulation in the discharge port or powder caking. Therefore, a common solution is to arrange a screen above the sealing disc of the discharge port. However, after the screen is arranged, the length of the discharging area in the vertical direction is extended, which causes the powder to easily stick to the inner wall of the discharging area or the screen. Therefore, a powder tank powder discharging device with low sticking probability and smooth discharging is needed. SUMMARY

[0005] To solve the above-mentioned problems in the prior art, the application provides a powder tank powder discharging device, which has the characteristics of low sticking probability and smooth discharging.

[0006] The object of the application can be achieved by the following technical scheme:

[0007] A powder tank powder discharging device, comprising a tank body, a sandwich layer is arranged at the bottom of the tank body, the sandwich layer is provided with a through hole coaxial with the tank body, a screen is arranged in the through hole of the upper surface of the sandwich layer, the screen comprises a circular frame and a screen body in the frame, a rotating shaft coaxial with the tank body is arranged in the tank body, a limiting plate is arranged at the bottom of the rotating shaft, the limiting plate is symmetrically arranged on both sides of the edge of the rotating shaft, and the limiting plate is symmetrically arranged on both sides of the edge of the rotating shaft. The inner surface of the frame is slidably attached to the inner surface of the frame, and the lower edge of the limiting plate is slidably attached to the upper surface of the screen body.

[0008] As a preferred technical solution of the present application, a scraper is slidably arranged in the sandwich layer, the scraper slides in the sandwich layer along the radial direction of the tank body, the upper surface and the lower surface of the scraper are slidably attached to the upper surface and the lower surface of the sandwich layer respectively, the scraper is provided with a through hole, the through hole is consistent with the shape of the through hole, the through hole and the through hole are coaxial in the axial direction of the tank body when the scraper moves to a certain point in the stroke, one end of the scraper extends out of the sandwich layer and the tank body, and the part of the scraper extending out of the sandwich layer is formed with a handle.

[0009] As a preferred technical solution of the present application, the scraper is drivingly connected with a driver, the rotating shaft drives the scraper to slide in the sandwich layer along the radial direction of the tank body through a transmission assembly, and the scraper is in an open position when the through hole and the through hole are coaxial in the axial direction of the tank body. The driver drives the scraper to make periodic reciprocating motion around the open position.

[0010] As a preferred technical solution of the present application, a control module is further included, the control module is electrically connected with the rotating shaft, the control module is used for adjusting the rotating speed of the rotating shaft, the control module is electrically connected with a capacity sensor, the capacity sensor is arranged on the limiting plate and is used for uploading the amount of powder in the tank body to the control module, and the control module reduces the rotating speed when the amount of powder exceeds a threshold range.

[0011] As a preferred technical solution of the present application, the capacity sensor is arranged on the limiting plate and is used for uploading the amount of powder F received by the limiting plate to the control module, and the control module adjusts the motion period of the rotating shaft to A1 times of the standard value, wherein A1 = [- (x-2) ^2 + 5] / 2, and 0≤F≤4.

[0012] As a preferred technical solution of the present application, the scraper is provided with a knocking assembly, and the driver drives the knocking assembly to periodically knock the inner wall of the sandwich layer when the driver drives the scraper to make periodic reciprocating motion around the open position.

[0013] As a preferred technical scheme of the present application, the side wall of the rotating shaft near the scraper is provided with two stirring frames, each of the stirring frames comprises a bottom edge, a top edge and a side edge, the bottom edges of the two stirring frames are axially symmetrical, the top edge of one of the stirring frames is closer to the top of the tank than the top edge of the other stirring frame, and the side edges of the two stirring frames are respectively connected to the bottom edges and the top edges of the stirring frames away from the side of the rotating shaft.

[0014] The present application has the following advantages:

[0015] (1) By coaxially arranging the rotating shaft, the through hole and the screen mesh, and by making the limiting plate at the bottom of the rotating shaft fit the inner wall of the screen mesh frame and the mesh body, the rotating shaft can drive the limiting plate to rotate closely to the screen mesh during rotation, continuously stirring the powder above the screen mesh, reducing the probability of powder caking or congestion, and accelerating the outflow of the powder;

[0016] (2) By making the limiting plate fit the inner wall of the screen mesh and the mesh body, the limiting plate and the screen mesh are in sliding fit during the process of the rotating shaft driving the limiting plate to rotate closely to the screen mesh, the screen mesh plays a limiting role on the limiting plate, and then completes the limiting role on the rotating shaft, so that the screen mesh and the limiting plate cooperate to accelerate the outflow of the powder while improving the stability and service life of the screw rod;

[0017] (3) By arranging the scraper in the interlayer to reciprocate along a straight line and arranging the through hole on the scraper to be equal in size to the through hole, the scraper can block the through hole when moving to a position where the through hole and the through hole do not completely coincide, and open the through hole when moving to a position where the through hole and the through hole partially or completely coincide, while making the upper surface of the scraper rub against the through hole and the screen mesh during movement, completing the scraping of the powder at the bottom of the screen mesh, so that the scraper takes into account the opening and closing function while avoiding the adhesion of the powder to the bottom of the screen mesh, further reducing the adhesion probability and improving the smoothness of the discharge;

[0018] (4) By making the driver drive the scraper to periodically reciprocate around the open position, the scraper can automatically and continuously scrape the powder at the bottom of the screen mesh using the edge of the through hole, improving the cleaning effect of the scraper on the adhered powder at the bottom of the screen mesh;

[0019] (5) By arranging the control module and the capacity sensor, the control module can reduce the rotating speed when the resistance exceeds the threshold range, complete the increase of the rotating speed of the rotating shaft and the limiting plate when the resistance is moderate, representing that the amount of powder is relatively large, and the dispersing effect of the limiting plate on the powder above the screen mesh needs to be enhanced, reduce the rotating speed of the rotating shaft and the limiting plate when the amount of powder is too large, the force on the powder above the screen mesh is large, and the limiting plate has a probability of pressing the powder on the screen mesh, or when the amount of powder is small, the amount of powder above the screen mesh is small, and the rotating speed of the limiting plate does not need to be too large;

[0020] (6) By setting a striking component, when the driver drives the scraper to make a periodic reciprocating motion around the open position, the striking component periodically strikes the inner wall of the jacket. This allows the scraper to strike the bottom part of the tank while scraping the powder adhering to the bottom of the screen, breaking up the bottom powder that is under greater pressure and is more likely to clump, and assisting the stirring frame in breaking up the powder. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the exploded structure of the present invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of the structure near the screen of the present invention;

[0025] Figure 4 This is a block diagram of the control loop of the present invention.

[0026] Explanation of key component symbols:

[0027] In the diagram: 1. Tank body; 11. Jacket; 12. Through hole; 13. Screen; 131. Frame; 132. Mesh; 2. Rotating shaft; 21. Limiting plate; 22. Stirring frame; 3. Scraper; 31. Through hole. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0029] Please see Figures 1-4 A powder dispensing device for a powder container includes a container body 1, a jacket 11 at the bottom of the container body 1, a through hole 12 coaxially arranged in the jacket 11, a screen 13 in the through hole 12 on the upper surface of the jacket 11, the screen 13 including a frame 131 and a mesh 132 in the frame 131, and a rotating shaft 2 coaxially arranged in the container body 1.

[0030] Specifically, the tank 1 is cylindrical in shape, and a quadrangular prism cavity is formed in the bottom surface of the cylindrical tank 1. The quadrangular prism cavity is a sandwich 11. The cavity automatically forms an upper surface and a lower surface on the bottom surface of the tank 1. At this time, the upper surface is close to the inside of the tank 1, and the lower surface is close to the outside of the tank 1. The axis of the cylindrical tank 1 is perpendicular to the ground.

[0031] The upper surface and the lower surface of the interlayer 11 are provided with circular through holes 12 of the same shape, and the circular through holes 12 of the upper surface and the lower surface are coaxial with the axis of the cylindrical tank body 1. At this time, the bottom surface of the cylindrical tank body 1 is provided with a through hole 12 penetrating the interlayer 11, facilitating discharging;

[0032] The through hole 12 of the upper surface of the interlayer 11 is embedded with a screen 13. The screen 13 is also circular in cooperation with the through hole 12. Specifically, the screen 13 has a frame 131 and a mesh body 132 in the frame 131. The frame 131 of the screen 13 is an annular ring with an outer diameter equal to the inner diameter of the through hole 12. The upper surface of the frame 131 of the screen 13 is flush with the bottom surface of the tank body 1. The frame 131 of the screen 13 is provided with a mesh body 132. The mesh body 132 is used to filter the caked powder. When the cross section of the screen 13 is arranged in the axial direction, the overall cross-sectional profile of the screen 13 above is a concave rectangle.

[0033] The rotating shaft 2 coaxial with the tank body 1 is driven by an external driving structure, maintained in a coaxial position with the tank body 1 and rotated along its own axial direction. The side wall near the side of the rotating shaft 2 close to the scraper 3 is provided with two stirring frames 22. The two stirring frames 22 each include a bottom edge, a top edge and a side edge. The bottom edges of the two stirring frames 22 are symmetrically arranged along the axial direction of the rotating shaft 2. The top edge of one of the stirring frames 22 is closer to the top of the tank body 1 than the top edge of the other stirring frame 22. The side edges of the two stirring frames 22 are respectively connected to the bottom edge and the top edge of the stirring frame 22 away from the side of the rotating shaft 2.

[0034] In use, the rotating shaft 2 drives the stirring frame 22 to stir the powder at the bottom of the tank body 1, dispersing the powder to reduce the probability of powder sticking together, assisting the powder to pass through the screen 13, and then through the discharge port including the through hole 12, and then completing the powder discharging process.

[0035] In the above process, due to the small diameter of the through hole 12, blockage is likely to occur, such as powder accumulation near the through hole 12 or the screen 13, or powder caking. The powder near the screen 13 needs to be dispersed, and the powder on the surface of the screen 13 needs to be scraped off. At the same time, in order to ensure that there are as few solid structures as possible in the through hole 12 to hinder the powder from passing through the discharge port, the rotating shaft 2 cannot intrude into the discharge port including the through hole 12, and the transmission mechanism cannot be arranged at the bottom of the tank body 1 where a large amount of powder accumulates, so as to obtain power and fixation from the driving mechanism from below. Therefore, the rotating shaft 2 can usually only rely on the fixation effect of the transmission mechanism from above. At this time, the lower end of the rotating shaft 2 away from the top lacks fixation, and the rotating shaft 2 itself has a certain axial size to penetrate into the bottom of the tank body 1, which leads to the probability of the lower end of the rotating shaft 2 shaking or twisting under the action of the reaction force of the powder during the process of pressing and stirring the powder. The lower part of the rotating shaft 2 needs to be fixed.

[0036] Therefore, in order to fix the lower part of the rotating shaft 2 and scatter the powder near the screen 13 and scrape the powder on the upper surface of the screen 13, the bottom of the rotating shaft 2 is provided with a limiting plate 21, the side edge of the limiting plate 21 is attached to the inner side of the frame 131, and the limiting plate 21 is attached to the upper surface of the net body 132;

[0037] Specifically, since the overall cross-sectional profile above the screen 13 is a concave rectangle, and in order to fix the rotating shaft 2, the limiting plate 21 below the rotating shaft 2 needs to be slidingly attached to the inner wall of the screen 13. When the rotating shaft 2 has a tendency to sway, the limiting plate 21 extrudes the inner wall of the annular frame 131, the inner wall of the annular frame 131 limits the movement of the limiting plate 21, thereby limiting the swaying of the rotating shaft 2. At the same time, when the limiting plate 21 cannot be attached to the inner wall of the annular frame 131, the gap between the inner wall of the annular frame 131 and the limiting plate 21 can accommodate the extruded powder, which in turn causes the powder to clump. Therefore, the limiting plate 21 is rectangular, the midpoint of the lower edge of the rectangular limiting plate 21 coincides with the axis of the screen 13, the length of the lower edge is equal to the diameter of the circular net body 132, the two side edges of the rectangular limiting plate 21 are respectively slidingly attached to the inner side of the annular frame 131, and the upper edge of the limiting plate 21 is integrally connected to the bottom of the rotating shaft 2. At this time, since the length of the side edge is higher than the concave height of the overall cross-sectional profile above the annular frame 131, the upper edge of the limiting plate 21 is higher than the inner bottom surface of the tank body 1, the bottom of the rotating shaft 2 is higher than the upper edge of the annular frame 131, and the gap between the bottom of the rotating shaft 2 and the upper edge of the annular frame 131 is used to make the powder flow onto the screen 13;

[0038] When the rotating shaft 2 has a tendency to sway and drives the limiting plate 21 to sway, one end or both ends of the limiting plate 21 press against the frame 131, the limiting plate 21 is slidingly attached to the screen 13, the screen 13 exerts a limiting effect on the limiting plate 21, thereby completing the limiting effect on the rotating shaft 2, so that the screen 13 and the limiting plate 21 cooperate to accelerate the outflow of the powder while improving the stability and service life of the screw rod;

[0039] At the same time, since the limiting plate 21 is attached to the inner side of the frame 131 of the screen 13 and the upper surface of the net body 132 at the same time, when it is driven to rotate by the rotating shaft 2, the screen 13 continuously scrapes the powder on the surface of the screen 13, reducing the probability of powder clumping or congestion;

[0040] By coaxially arranging the rotating shaft 2, the through hole 12 and the screen 13, and attaching the limiting plate 21 at the bottom of the rotating shaft 2 to the inner wall of the frame 131 of the screen 13 and the net body 132, the rotating shaft 2 can drive the limiting plate 21 to rotate closely to the screen 13 during rotation, continuously stirring the powder above the screen 13, scraping the upper surface of the screen 13, reducing the probability of powder clumping or congestion, and accelerating the outflow of the powder;

[0041] Meanwhile, by setting the limiting plate 21 to be attached to the inner wall of the screen 13 and the screen body 132, in the process of rotating the limiting plate 21 to be tightly attached to the screen 13 by the rotating shaft 2, the limiting plate 21 is slidably attached to the screen 13, the screen 13 plays a limiting role on the limiting plate 21, and then the limiting role on the rotating shaft 2 is completed, so that the screen 13 and the limiting plate 21 cooperate to accelerate the powder outflow while improving the stability and service life of the screw rod.

[0042] In the above structure, although the limiting plate 21 is arranged to scrape the powder on the upper surface of the screen 13, the lower surface of the screen 13 is not treated, and dust still has a probability of staying on the lower surface after passing through the upper surface of the screen 13. Therefore, the scraper 3 is slidably arranged in the interlayer 11, the scraper 3 slides in the radial direction of the tank body 1 in the interlayer 11, the upper surface and the lower surface of the scraper 3 are slidably attached to the upper surface and the lower surface of the interlayer 11 respectively, the scraper 3 is provided with a through hole 31, the through hole 31 is consistent with the shape of the through hole 12, the through hole 31 and the through hole 12 coincide in the axial direction of the tank body 1 when the scraper 3 moves to a certain point in the stroke, one end of the scraper 3 extends out of the interlayer 11 and the tank body 1, and the part of the scraper 3 extending out of the interlayer 11 is formed with a handle;

[0043] Specifically, the scraper 3 is divided into an inner segment and an outer segment, both of which are quadrangular prisms with rectangular surfaces, and the height of the scraper 3 in the direction perpendicular to the ground is equal to the height of the inner segment and the outer segment, and the length and width of the inner segment and the outer segment can be adaptively set according to actual needs.

[0044] The height of the interlayer 11 is equal to the height of the scraper 3, so that the scraper 3 is slidably attached to the upper and lower surfaces of the interlayer 11, and the scraper 3 is attached to the lower surface of the screen 13, so that the lower surface of the screen 13 can be scraped;

[0045] The size of the interlayer 11 in the radial direction of the tank body 1 is greater than the length of the scraper 3, so that the scraper 3 can move linearly in the interlayer 11.

[0046] The inner section of the scraper 3 is provided with a through hole 31, which is a cylindrical hole with an axis line coinciding with the height of the scraper 3, and the radial cross-sectional shape of the through hole 31 is consistent with the shape of the through hole 12, and the setting position of the through hole 31 ensures that when the scraper 3 moves to a certain point in the linear reciprocating stroke in the interlayer 11, the axis line of the through hole 31 coincides with the axis line of the through hole 12, at this time the through hole 31, the through hole 12 on the upper surface of the interlayer 11 and the through hole 12 on the lower surface of the interlayer 11 form a complete through path; at the same time, the setting of the scraper 3 and the interlayer 11 ensures that when the scraper 3 moves to the two ends of the stroke, the part of the inner section of the scraper 3 without the through hole 31 coincides with the through hole 12 in the axial direction of the tank body 1, blocking the through hole 12, when the through hole 31 and the through hole 12 are completely coincident in the axial direction of the tank body 1, the through hole 12 of the interlayer 11 is blocked by the solid structure of the scraper 3, at this time the scraper 3 adjusts the position of the through hole 31 by its own movement, so that the scraper 3 has the function of controlling the opening and closing of the tank body 1;

[0047] At the same time, the edge of the through hole 31 and the edge of the scraper 3 automatically form an edge, when the edge of the through hole 31 scrapes the lower surface of the screen 13 during the reciprocating movement of the scraper 3, the edge scrapes the lower surface of the screen 13, completing the scraping of the dust on the lower surface of the screen 13 and reducing the probability of dust sticking on the lower surface of the screen 13;

[0048] Optionally, to enhance the scraping efficiency of the edge, the axial cross-sectional shape of the through hole 31 is trapezoidal, at this time the through hole 31 as a whole is a conical frustum shape continuously widening from top to bottom, and the edge part forms a sharp edge similar to a knife edge;

[0049] By setting the interlayer 11 to slide and fit with the upper and lower surfaces of the interlayer 11, the scraper 3 in the interlayer 11 can reciprocate linearly, and the through hole 31 on the scraper 3 is set to be equal to the through hole 12, so that when the scraper 3 moves to a position where the through hole 31 and the through hole 12 are completely coincident, the through hole 12 is blocked, and when it moves to a position where the through hole 31 and the through hole 12 are partially or completely coincident, the through hole 12 is opened, and at the same time, the scraper 3 scrapes the through hole 12 or the screen 13 during the movement, completing the scraping of the powder at the bottom of the screen 13, so that the scraper 3 has the functions of opening and closing while avoiding the powder sticking to the bottom of the screen 13, further reducing the probability of sticking and improving the smoothness of discharging.

[0050] To automatically reciprocate the scraper 3, the scraper 3 is drivingly connected with a driver, the rotating shaft 2 drives the scraper 3 to slide in the interlayer 11 along the radial direction of the tank body 1 through a transmission assembly, when the scraper 3 moves to a position where the through hole 31 and the through hole 12 are coincident in the axial direction of the tank body 1, it is an open position, the driver drives the scraper 3 to periodically reciprocate around the open position;

[0051] Optionally, the driver can be selected with the rotating shaft 2, and the rotating shaft 2 and the scraper 3 are connected through a transmission assembly, so that the rotating shaft 2 can drive two sets of components at the same time, and it is ensured that the scraper 3 starts reciprocating motion only when the powder tank is running, avoiding waste of energy consumption.

[0052] For the convenience of controlling the rotating speed of the rotating shaft 2, a control module is further included, which is electrically connected with the rotating shaft 2, and is used for adjusting the rotating speed of the rotating shaft 2.

[0053] By making the driver drive the scraper 3 to make periodic reciprocating motion around the open position, the scraper 3 can automatically and continuously scrape the powder at the bottom of the screen 13 through the edge of the hole 31, improving the cleaning effect of the scraper 3 on the powder adhered to the bottom of the screen 13.

[0054] The above-mentioned limiting plate 21 scatters the powder above the screen 13, and scrapes the powder on the upper surface of the screen 13 during the process;

[0055] When there is more powder, the probability of caking or sticking is larger, and the limiting plate 21 needs to push and scatter the powder more frequently, so the rotating speed of the rotating shaft 2 needs to be increased;

[0056] When there is a lot of powder, the powder above will exert more pressure on the powder near the screen 13, so if the rotating speed of the limiting plate 21 is too fast and the pushing force on the powder is too frequent, it may cause the powder to caking, which is not conducive to the scattering effect, so the rotating speed of the rotating shaft 2 needs to be reduced;

[0057] When there is less powder, the probability of caking or sticking is smaller, and if the rotating speed of the limiting plate 21 is too fast, there is a probability that the limiting plate 21 will lift up the less powder before it falls through the screen 13, reducing the probability of powder output;

[0058] Therefore, the control module is electrically connected with a capacity sensor, which is arranged on the limiting plate 21 and is used to upload the amount of powder in the tank 1 to the control module, and the control module reduces the rotating speed when the amount of powder exceeds the threshold range;

[0059] Specifically, the capacity sensor is arranged on the limiting plate 21 and is used to upload the amount of powder F on both sides of the limiting plate 21 to the control module, and the control module adjusts the movement period of the rotating shaft 2 to A1 times of the standard value, where A1 = [- (x-2) 2 + 5] / 2, and 0 ≤ F ≤ 4, when F < 0 or F > 4, the control module takes F = 0 or F = 4;

[0060] According to the function image of F(F)=A1=[-(x-2)^2+5] / 2, when the powder amount F=2, which is the center of the threshold range, the powder amount is relatively large, at this time the function reaches the highest point, A1=2.5, when the control module adjusts the movement period of the rotating shaft 2 to A1 times of the standard value, the rotating speed of the rotating shaft 2 is increased when the powder amount is relatively large;

[0061] When the powder amount F approaches the value range ends 0 or 4 from the center 2 of the threshold range, the function F(F) output value gradually decreases, when the powder amount reaches the value range ends, the function value is minimum, A1=0.5, when the control module adjusts the movement period of the rotating shaft 2 to A1 times of the standard value, the rotating speed of the rotating shaft 2 is reduced when the powder amount is extremely large or small;

[0062] By setting the control module and the capacity sensor, the control module reduces the rotating speed when the resistance exceeds the threshold range, and increases the rotating speed of the rotating shaft 2 and the limiting plate 21 when the resistance is relatively moderate, which represents that the powder amount is relatively large, and the dispersing effect of the limiting plate 21 on the powder above the screen 13 needs to be enhanced; when the powder amount is too large, the force on the powder above the screen 13 is large, and the movement of the limiting plate 21 has a probability of pressing the powder on the screen 13, or when the powder amount is small, the powder amount above the screen 13 is small, and the rotating speed of the limiting plate 21 does not need to be too large, the rotating speed of the rotating shaft 2 and the limiting plate 21 is reduced.

[0063] In order to further reduce the probability of powder caking, the scraper 3 is provided with a knocking assembly, and the knocking assembly is driven to knock the inner wall of the interlayer 11 periodically when the driver drives the scraper 3 to make periodic reciprocating motion around the open position;

[0064] By setting the knocking assembly, the driver drives the scraper 3 to make periodic reciprocating motion around the open position, and the knocking assembly is driven to knock the inner wall of the interlayer 11 periodically, so that the scraper 3 can knock the bottom part of the tank body 1 during scraping the caked powder at the bottom of the screen 13, disperse the bottom powder which is under greater pressure and is more likely to caking, and assist the stirring frame 22 in dispersing the powder.

[0065] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the preferred embodiment of the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications made on the basis of the technical essence of the present application to the above embodiments are still within the scope of the technical solution of the present application.

Claims

1. A powder discharging device for a powder container, characterized in that: The device includes a tank body, a sandwich layer at the bottom of the tank body, a through hole coaxially arranged in the sandwich layer, a screen in the through hole on the upper surface of the sandwich layer, the screen including a circular frame and a mesh in the frame, a rotating shaft coaxially arranged in the tank body, a limiting plate at the bottom of the rotating shaft, the two sides of the limiting plate slidingly fitting with two points on the inner surface of the frame respectively, and the lower edge of the limiting plate slidingly fitting with the upper surface of the mesh; A scraper is slidably disposed within the interlayer. The scraper slides radially along the tank body within the interlayer. The upper and lower surfaces of the scraper slide in contact with the upper and lower surfaces of the interlayer, respectively. A through hole is provided through the scraper. The through hole has the same shape as the through hole. When the scraper moves to one point in its stroke, the through hole and the through hole coincide in the axial direction of the tank body. One end of the scraper extends out of the interlayer and the tank body. The part of the scraper extending out of the interlayer forms a handle. The scraper is connected to a driver, and the rotating shaft drives the scraper to slide radially along the tank body in the interlayer through the transmission assembly. The scraper is in the open position when the through hole and the through hole coincide in the axial direction of the tank body. The driver drives the scraper to perform periodic reciprocating motion around the open position.

2. The powder discharging device for a powder tank according to claim 1, characterized in that: It also includes a control module, which is electrically connected to the rotating shaft. The control module is used to adjust the rotation speed of the rotating shaft. The control module is electrically connected to a capacity sensor, which is set on a limit plate and is used to upload the amount of powder in the tank to the control module. The control module reduces the rotation speed when the amount of powder exceeds the threshold range.

3. The powder discharging device for a powder tank according to claim 2, characterized in that: The capacity sensor is set on the limit plate and is used to upload the amount of powder F received by the limit plate to the control module. The control module adjusts the motion cycle of the rotating shaft to A1 times the standard value, where A1=[-(F-2)^2+5] / 2, and 0≤F≤4.

4. The powder discharging device for a powder tank according to claim 1, characterized in that: The scraper is equipped with a striking component. When the driver drives the scraper to make a periodic reciprocating motion around the open position, it drives the striking component to periodically strike the inner wall of the interlayer.

5. A powder discharging device for a powder tank according to claim 1, characterized in that: Two stirring frames are provided on the side wall of the rotating shaft near the scraper. Each stirring frame includes a bottom edge, a top edge, and a side edge. The bottom edges of the two stirring frames are symmetrical along the rotating shaft axis. The top edge of one stirring frame is closer to the top of the tank than the top edge of the other stirring frame. The two ends of the side edges of the two stirring frames are respectively connected to the bottom edge and the top edge of the same stirring frame away from the rotating shaft.

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