Powder discharging device of powder tank

Abstract

The invention relates to a powder discharging device of a powder tank, and belongs to the technical field of feeding devices, the powder discharging device comprises a tank body, an interlayer is arranged at the bottom of the tank body, a through hole coaxial with the tank body is formed in the interlayer in a penetrating manner, a screen is arranged in the through hole in the upper surface of the interlayer, and 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 edges of the two sides of the limiting plate are in sliding fit with the two positions of the inner surface of the frame respectively in an axial symmetry mode, and the lower edge of the limiting plate is in sliding fit with the upper surface of the net body; the device has the characteristics of low bonding probability and smooth discharging.

Description

Technical Field

[0001] The invention belongs to the technical field of feeding devices, and in particular relates to a powder discharging device of a powder tank. Background Art

[0002] In the textile printing and dyeing industry, a powder tank is a device used to contain dye powder. It has a vacuum inside and generally includes a tank body, a top cover, a bottom plate and a sealing disk. The top cover and the tank body are generally fixed by screwing. A rotating shaft is arranged inside. The sealing disk is installed at the bottom of the tank body. A through hole is opened in the middle to allow the rotating shaft to pass through. The bottom of the rotating shaft is threaded. The rotating shaft is rotated by a robot to drive the powder to fall. The powder falls from the bottom of the rotating shaft into the discharge port to realize discharge.

[0003] A general powder tank structure, such as a powder feeding device disclosed in Chinese patent CN221215372U, includes a mounting seat, a powder tank body, a powder tank cover, a feeding shaft and a leakage port pipe, wherein the powder tank cover is detachably connected to the top 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 passes through the powder tank cover, the powder tank cover is provided with a first vent hole, a vent hole sealing ring is fixedly connected to the position corresponding to the first vent hole on the inside of the powder tank cover, and an vent hole ring is fixedly connected to one end of the feeding shaft close to the powder tank cover, a second vent hole is provided on the vent hole ring, and the vent hole ring is set against the vent hole sealing ring. By arranging the vent hole ring on the feeding shaft and linking with the first vent hole on the powder tank cover, the problem of daily closure to avoid internal moisture is realized, and external air exchange can be carried out during feeding to avoid the problem of vacuum forming inside and failing to feed, and the sealing is good and the feeding is accurate.

[0004] However, in the above scheme, the discharge structure is to set a threaded rod on the discharge port to drive the powder to fall, but since the diameter of the discharge port is usually small, it is easy to get blocked, for example, the powder accumulates at the discharge port, or the powder clumps. Therefore, the usual solution is to set a screen above the sealing disk of the discharge port. However, after the screen is set, the length of the discharge area in the vertical direction is extended, which makes the powder easy to stick to the inner wall of the discharge area or the screen. Therefore, a powder tank discharge device with low sticking probability and smooth discharge is needed. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a powder discharging device for a powder tank, which has the characteristics of low sticking probability and smooth material discharging.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A powder discharging device of a powder tank comprises a tank body, a sandwich layer is arranged at the bottom of the tank body, a through hole is arranged coaxially with the tank body through the sandwich layer, a screen is arranged in the through hole on the upper surface of the sandwich layer, the screen comprises a circular frame and a mesh body in the frame, a rotating shaft coaxial with the tank body is arranged in the tank body, a limit plate is arranged at the bottom of the rotating shaft, the edges on both sides of the limit plate are axially symmetrically slidably fitted with two locations of the inner surface of the frame, and the lower edge of the limit plate is slidably fitted with the upper surface of the mesh body.

[0008] As a preferred technical solution of the present invention, a scraper is slidably arranged in the interlayer, and the scraper slides radially along the tank body in the interlayer. The upper and lower surfaces of the scraper are respectively slidably fitted with the upper and lower surfaces of the interlayer. The scraper is provided with a through hole, and the through hole is consistent in shape with the through hole. When the scraper moves to one point in the stroke, the through hole and the through hole coincide with the axial direction of the tank body. One end of the scraper extends out of the interlayer and the tank body, and the part of the scraper extending out of the interlayer forms a handle.

[0009] As a preferred technical solution of the present invention, the scraper transmission is connected to a driver, and the rotating shaft drives the scraper to slide radially along the tank body in the interlayer through a transmission assembly, so that the scraper is in an open position when the through hole and the through hole coincide with each other in the axial direction of the tank body, and the driver drives the scraper to perform periodic reciprocating motion around the open position.

[0010] As a preferred technical solution of the present invention, 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 arranged 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 a threshold range.

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

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

[0013] As a preferred technical solution of the present invention, two stirring frames are provided on the side wall of the rotating shaft close to the scraper. Both of the two stirring frames include a bottom edge, a top edge and a side edge. The bottom edges of the two stirring frames are axially symmetric about the rotating shaft. The top edge of one of the stirring frames is closer to the top of the tank body 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 sides of the bottom edge and the top edge of the same stirring frame away from the rotating shaft.

[0014] The beneficial effects of the present invention are as follows:

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

[0016] (2) By setting the limiting plate to fit the inner wall and the mesh body of the screen, during the process of the rotating shaft driving the limiting plate to closely rotate above the screen, the limiting plate slides and fits with the screen, and the screen plays a limiting role on the limiting plate, thereby completing the limiting role on the rotating shaft, so that the cooperation of the screen and the limiting plate improves the stability and service life of the screw rod while accelerating the outflow of the powder;

[0017] (3) By arranging a scraper that slides and fits with the upper and lower surfaces of the interlayer in the interlayer and can reciprocate linearly in the interlayer, and arranging a through hole on the scraper that is the same size as the through hole, when the scraper moves to a position where the through hole and the through hole do not coincide at all, the through hole is blocked, and when it moves to a position where the through hole and the through hole partially or completely coincide, the through hole is opened. At the same time, the upper surface of the scraper scrapes against the inside of the through hole and the screen during the movement, completing the scraping of the powder at the bottom of the screen, so that the scraper combines the functions of opening and closing, avoiding the powder from sticking to the bottom of the screen, further reducing the sticking probability, and improving the smoothness of the discharge;

[0018] (4) By making the driver drive the scraper to make a periodic reciprocating movement around the open position, the scraper can automatically and continuously scrape the powder at the bottom of the screen with the edge of the through hole, improving the cleaning effect of the scraper on the powder sticking to the bottom of the screen;

[0019] (5) By setting a control module and a capacity sensor, the control module reduces the rotation speed when the resistance exceeds the threshold range, and completes increasing the rotation speed of the rotating shaft and the limiting plate when the resistance is relatively moderate, which means that the powder amount is large and the dispersion effect of the limiting plate on the powder above the screen needs to be enhanced; when the powder amount is too large, the force on the powder above the screen is large, and there is a probability that the limiting plate will compact the powder above the screen during movement, or when the powder amount is small and the powder amount above the screen is small and there is no need for too high a rotation speed of the limiting plate, the rotation speed of the rotating shaft and the limiting plate is reduced;

[0020] (6) By setting up a knocking component, when the driver drives the scraper to make periodic reciprocating movements around the open position, the knocking component is driven to periodically knock the inner wall of the interlayer, so that during the process of the scraper scraping the bonded powder at the bottom of the screen, the bottom part of the tank body can be knocked, and the bottom powder that is under greater pressure and easier to agglomerate can be broken up, assisting the stirring frame to break up the powder. Description of the Drawings

[0021] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

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

[0023] Figure 2 It is an exploded structure diagram of the present invention;

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

[0025] Figure 4 It is a block diagram of the control circuit of the present invention.

[0026] Description of the main component symbols:

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

[0028] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will describe in detail the specific embodiments, structures, features and effects of the present invention with reference to the accompanying drawings and preferred embodiments.

[0029] Please refer to Figures 1-4 , a powder tank powder discharging device, including a tank body 1, an interlayer 11 is arranged at the bottom of the tank body 1, a through hole 12 coaxial with the tank body 1 is arranged through the interlayer 11, a screen 13 is arranged in the through hole 12 on the upper surface of the interlayer 11, the screen 13 includes a frame 131 and a mesh body 132 in the frame 131, and a rotating shaft 2 coaxial with the tank body 1 is arranged in the tank body 1;

[0030] Specifically, the whole tank body 1 is cylindrical, a quadrangular prism-shaped cavity is formed in the bottom surface of the cylindrical tank body 1, the quadrangular prism-shaped cavity is the interlayer 11, the cavity is arranged to automatically form an upper surface and a lower surface on the bottom surface of the tank body 1, at this time, the upper surface is close to the inside of the tank body 1, the lower surface is close to the outside of the tank body 1, and the axis line of the cylindrical tank body 1 is perpendicular to the ground;

[0031] The upper surface and the lower surface of the interlayer 11 are both provided with circular through-holes 12 with the same shape, and the circular through-holes 12 on the upper surface and the lower surface coincide 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, which is convenient for discharging materials;

[0032] A screen 13 is embedded in the through-hole 12 on the upper surface of the interlayer 11. The screen 13 is also circular to match the through-hole 12. Specifically, the frame 131 of the screen 13 and the mesh body 132 in the frame 131. The frame 131 of the screen 13 is an annular shape 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. A mesh body 132 is arranged in the frame 131 of the screen 13. The mesh body 132 is used to filter the caked powder. When a cross-section is set along the axis of the screen 13, the overall cross-sectional contour above the screen 13 is a concave rectangle;

[0033] The rotating shaft 2 coaxial with the tank body 1 is driven by an external driving structure to maintain a position coaxial with the tank body 1 and rotate along its own axis. On the side wall of the rotating shaft 2 close to the scraper 3, two stirring frames 22 are arranged. Both of the two stirring frames 22 include a bottom edge, a top edge and a side edge. The bottom edges of the two stirring frames 22 are axially symmetric along 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 two ends of the side edges of the two stirring frames 22 are respectively connected to the side away from the rotating shaft 2 of the bottom edge and the top edge in the same stirring frame 22;

[0034] During use, the rotating shaft 2 drives the stirring frame 22 to stir the powder at the bottom of the tank body 1, break up the powder to reduce the probability of powder adhesion, assist the powder to pass through the screen 13, and then pass through the material discharge port including the through-hole 12, thereby completing the powder discharging process;

[0035] In the above process, since the diameter of the through-hole 12 is usually small, it is easy to be blocked. For example, the powder accumulates near the through-hole 12 or the screen 13, or the powder caking occurs. It is necessary to specifically break up the powder near the screen 13 and scrape off the powder on the surface of the screen 13. At the same time, since it is necessary to ensure that there is as little solid structure as possible in the through-hole 12 to block the powder from passing through the material discharge port, the rotating shaft 2 cannot penetrate into the material discharge port including the through-hole 12, and it is difficult to set the transmission mechanism at the bottom of the tank body 1 where a large amount of powder accumulates. Therefore, the power and fixing effect of the driving mechanism cannot be obtained from below. Therefore, the rotating shaft 2 usually can only rely on the fixing effect of the transmission mechanism from above. At this time, the lower end of the rotating shaft 2 far from the above lacks fixation, and the rotating shaft 2 itself has a certain axial dimension extending deep into the bottom of the tank body 1, which results in 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 squeezing and stirring the powder. It is necessary to fix the lower part of the rotating shaft 2;

[0036] Therefore, in order to fix the lower part of the rotating shaft 2 and disperse the powder near the screen 13 and scrape the powder on the upper surface of the screen 13, a limiting plate 21 is provided at the bottom of the rotating shaft 2. The side edge of the limiting plate 21 is in contact with the inner side of the frame 131, and the limiting plate 21 is in contact with the upper surface of the mesh 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 in sliding contact with the inner wall of the screen 13. When the rotating shaft 2 has a tendency to shake, the limiting plate 21 presses against the inner wall of the annular frame 131, and the inner wall of the annular frame 131 restricts the movement of the limiting plate 21, thereby restricting the shaking of the rotating shaft 2. At the same time, when the limiting plate 21 cannot be in contact with the inner wall of the annular frame 131, the gap between the inner wall of the annular frame 131 and the limiting plate 21 will accommodate the extruded powder, which will instead cause the powder to agglomerate. 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, and the length of the lower edge is equal to the diameter of the circular mesh body 132. The two side edges of the rectangular limiting plate 21 are respectively in sliding contact with two places on the inner side of the annular frame 131. 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 depression 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, and the bottom of the rotating shaft 2 is higher than the upper edge of the annular frame 131. The gap between the bottom of the rotating shaft 2 and the upper edge of the annular frame 131 is used to allow the powder to flow into the upper part of the screen 13;

[0038] When the rotating shaft 2 has a tendency to shake and drives the limiting plate 21 to shake, one end or both ends of the limiting plate 21 press against the frame 131. The limiting plate 21 is in sliding contact with the screen 13, and the screen 13 plays a limiting role on the limiting plate 21, thereby completing the limiting effect on the rotating shaft 2. The cooperation of the screen 13 and the limiting plate 21 improves the stability and service life of the screw rod while accelerating the outflow of the powder;

[0039] At the same time, since the limiting plate 21 is in contact with both the inner side of the frame 131 of the screen 13 and the upper surface of the mesh body 132, when driven by the rotating shaft 2 to rotate, the screen 13 continuously scrapes off the powder on all surfaces of the upper surface of the screen 13, reducing the probability of powder agglomeration or congestion;

[0040] By coaxially arranging the rotating shaft 2, the through hole 12 and the screen 13, and making the limiting plate 21 at the bottom of the rotating shaft 2 fit the inner wall of the frame 131 of the screen 13 and the mesh body 132, when the rotating shaft 2 rotates, it drives the limiting plate 21 to closely rotate above the screen 13 by its own rotation, continuously stirs the powder above the screen 13, scrapes the upper surface of the screen 13, reduces the probability of powder agglomeration or congestion, and accelerates the outflow of the powder;

[0041] Meanwhile, by setting the limiting plate 21 to fit the inner wall of the screen mesh 13 and the mesh body 132, during the process of the rotating shaft 2 driving the limiting plate 21 to rotate closely above the screen mesh 13, the limiting plate 21 is in sliding fit with the screen mesh 13, and the screen mesh 13 plays a limiting role on the limiting plate 21, thereby completing the limiting role on the rotating shaft 2. The cooperation between the screen mesh 13 and the limiting plate 21 improves the stability and service life of the screw rod while accelerating the outflow of the powder material.

[0042] In the above structure, although the limiting plate 21 is provided to scrape the powder material on the upper surface of the screen mesh 13, the lower surface of the screen mesh 13 is not treated. However, there is still a probability that the dust remains on the lower surface after passing through the upper surface of the screen mesh 13. Therefore, a scraper 3 is slidably arranged in the sandwich layer 11. The scraper 3 slides radially along the tank body 1 in the sandwich layer 11. The upper surface and the lower surface of the scraper 3 are respectively in sliding fit with the upper surface and the lower surface of the sandwich layer 11. A through hole 31 is formed through the scraper 3, and the through hole 31 has the same shape as the through hole 12. When the scraper 3 moves to a certain point in the stroke, the through hole 31 coincides with the through hole 12 in the axial direction of the tank body 1. One end of the scraper 3 extends out of the sandwich layer 11 and the tank body 1, and a handle is formed on the part of the scraper 3 extending out of the sandwich layer 11.

[0043] Specifically, the scraper 3 is divided into an inner section and an outer section. Both the inner section and the outer section are quadrangular prisms with rectangular surfaces on all sides. After the scraper 3 is arranged in the sandwich layer 11, the dimension in the direction perpendicular to the ground is used as the height, and the heights of the inner section and the outer section are equal. The lengths and widths of the inner section and the outer section can be adaptively set according to actual needs.

[0044] The height of the sandwich layer 11 is equal to the height of the scraper 3. At this time, the scraper 3 is in sliding fit with the upper and lower surfaces of the sandwich layer 11, and at this time, the scraper 3 is in contact with the lower surface of the screen mesh 13 and can scrape the lower surface of the screen mesh 13.

[0045] The dimension of the sandwich layer 11 in the radial direction of the tank body 1 is greater than the length of the scraper 3, ensuring that the scraper 3 can reciprocate linearly in the sandwich layer 11.

[0046] A through hole 31 is provided on the inner section of the scraping blade 3. The through hole 31 is a cylindrical hole whose axis coincides with the height of the scraping blade 3. Moreover, the radial cross-sectional shape of the through hole 31 is the same as that of the through hole 12. And the setting position of the through hole 31 ensures that during the reciprocating linear motion of the scraping blade 3 in the interlayer 11, when it moves to a certain point, the axis of the through hole 31 coincides with the axis of the through hole 12. At this time, the through hole 12 on the upper surface of the interlayer 11, the through hole 31 of the scraping blade 3, 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 scraping blade 3 and the interlayer 11 ensures that when the scraping blade 3 moves to both ends of the stroke, the part of the inner section of the scraping blade 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 scraping blade 3 moves to a position where the through hole 31 and the through hole 12 are completely non-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 scraping blade 3. At this time, the scraping blade 3 adjusts the position of the through hole 31 through its own movement, enabling the scraping blade 3 to have the function of controlling the opening and closing of the tank body 1.

[0047] Meanwhile, a sharp edge is automatically formed at the edge of the through hole 31 and the scraping blade 3. When the scraping blade 3 reciprocates, as the edge of the through hole 31 scrapes across the lower surface of the screen 13, the sharp edge scrapes across 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 powder adhesion on the lower surface of the screen 13.

[0048] Optionally, to enhance the scraping efficiency of the sharp 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 frustum of a cone that continuously widens from top to bottom, and the sharp edge part forms an acute edge similar to a blade.

[0049] By providing a scraping blade 3 that is slidably fitted to the upper and lower surfaces of the interlayer 11 in the interlayer 11 and can reciprocate linearly in the interlayer 11, and by providing a through hole 31 on the scraping blade 3 that is the same size as the through hole 12, when the scraping blade 3 moves to a position where the through hole 31 and the through hole 12 are completely non-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. At the same time, during the movement of the scraping blade 3, its upper surface scrapes against the through hole 12 or the screen 13, completing the scraping of the powder at the bottom of the screen 13. This enables the scraping blade 3 to serve both as a switch and avoid powder adhesion at the bottom of the screen 13, further reducing the adhesion probability and improving the smoothness of material discharge.

[0050] To automatically perform the reciprocating motion of the scraping blade 3, the scraping blade 3 is drivingly connected to a driver. The rotating shaft 2 drives the scraping blade 3 to slide radially in the interlayer 11 along the tank body 1 through a transmission assembly. Taking the position where the scraping blade 3 moves to a position where the through hole 31 and the through hole 12 coincide in the axial direction of the tank body 1 as the open position, the driver drives the scraping blade 3 to perform periodic reciprocating motion around the open position.

[0051] Optionally, the drive can select the rotating shaft 2. The rotating shaft 2 and the scraper 3 are connected by a transmission component, 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 to reciprocate only when the powder tank is running, avoiding waste of energy consumption.

[0052] To facilitate the control of the rotation speed of the rotating shaft 2, a control module is further included. The control module is electrically connected to the rotating shaft 2, and the control module is used to adjust the rotation speed of the rotating shaft 2;

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

[0054] During the process of the above-mentioned limiting plate 21 dispersing the powder above the screen 13 and scraping the powder on the upper surface of the screen 13;

[0055] When there is more powder, the probability of caking or adhesion is greater, and the limiting plate 21 needs to push and disperse the powder more frequently. At this time, the rotation speed of the rotating shaft 2 needs to be increased;

[0056] When there is extremely a lot of powder, the powder above will exert more pressure on the powder near the screen 13. At this time, if the rotation speed of the limiting plate 21 is too fast and the thrust is applied to the powder too frequently, there is a probability of causing the powder to cake, which is not conducive to the dispersing effect. At this time, the rotation speed of the rotating shaft 2 needs to be reduced;

[0057] When there is less powder, the probability of powder caking or adhesion is smaller, and at this time, if the rotation speed of the limiting plate 21 is too fast, there is a probability that less powder will be lifted by the limiting plate 21 before falling through the screen 13, reducing the powder output probability;

[0058] For this reason, the control module is electrically connected to a capacity sensor. The capacity sensor is arranged on the limiting plate 21 and is used to upload the powder amount in the tank body 1 to the control module. The control module reduces the rotation speed when the powder amount exceeds the threshold range;

[0059] Specifically, the capacity sensor is arranged on the limiting plate 21 and is used to upload the powder amounts F on both sides of the limiting plate 21 to the control module. 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, where 0 ≤ F ≤ 4. When F < 0 or F > 4, the control module takes F = 0 or F = 4;

[0060] According to the function graph of F(F) = A1 = [-(x - 2)^2 + 5] / 2, when the powder quantity F = 2, that is, at the center of the threshold range, it represents a relatively large powder quantity. 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 the standard value, the rotation speed of the rotating shaft 2 is increased when the powder quantity is relatively large;

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

[0062] By setting the control module and the capacity sensor, when the resistance exceeds the threshold range, the control module reduces the rotation speed. When the resistance is relatively moderate, which represents a relatively large powder quantity and it is necessary to enhance the dispersing effect of the limiting plate 21 on the powder above the screen 13, the rotation speeds of the rotating shaft 2 and the limiting plate 21 are increased; when the powder quantity is too large, the force on the powder above the screen 13 is relatively large, and there is a probability that the limiting plate 21 will compact the powder above the screen 13 during movement, or when the powder quantity is small and the powder quantity above the screen 13 is small and there is no need for too high a rotation speed of the limiting plate 21, the rotation speeds of the rotating shaft 2 and the limiting plate 21 are decreased.

[0063] To further reduce the probability of powder caking, the scraper 3 is provided with a knocking component. When the driver drives the scraper 3 to make periodic reciprocating movements around the open position, the knocking component is driven to periodically knock the inner wall of the sandwich layer 11;

[0064] By setting the knocking component, when the driver drives the scraper 3 to make periodic reciprocating movements around the open position, the knocking component is driven to periodically knock the inner wall of the sandwich layer 11, so that during the process of the scraper 3 scraping the caked powder at the bottom of the screen 13, the bottom part of the tank body 1 can be knocked, the bottom powder that is under greater pressure and is more likely to cake is dispersed, and the stirring frame 22 is assisted in dispersing the powder.

[0065] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A powder can powder discharging device, characterized in that: It includes a tank body. A sandwich layer is provided at the bottom of the tank body. A through hole coaxial with the tank body is provided through the sandwich layer. A sieve mesh is provided in the through hole on the upper surface of the sandwich layer. The sieve mesh includes a circular frame and a mesh body in the frame. A rotating shaft coaxial with the tank body is provided in the tank body. A limiting plate is provided at the bottom of the rotating shaft. Two sides of the limiting plate are symmetrically and axially slidably attached to two inner surfaces of the frame respectively. The lower edge of the limiting plate is slidably attached to the upper surface of the mesh body.

2. The powder tank powder discharging device according to claim 1, wherein: A scraper is slidably provided in the sandwich layer. The scraper slides radially along the tank body in the sandwich layer. The upper surface and the lower surface of the scraper are respectively slidably attached to the upper surface and the lower surface of the sandwich layer. A through hole is provided through the scraper. The through hole has the same shape as the through hole. When the scraper moves to a certain point in its stroke, the through hole coincides with the through hole axially of the tank body. One end of the scraper extends out of the sandwich layer and the tank body. A handle is formed on the part of the scraper extending out of the sandwich layer.

3. The powder discharging device of a powder tank according to claim 2, wherein: The scraper is drivingly connected to a driver. The rotating shaft drives the scraper to slide radially along the tank body in the sandwich layer through a transmission component. When the through hole of the scraper coincides with the through hole axially of the tank body during movement, it is in the open position. The driver drives the scraper to make a periodic reciprocating motion around the open position.

4. A powder tank powder discharging device according to claim 1, characterized in that: It further includes a control module. The control module 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. The capacity sensor is provided on the limiting plate and is used to upload the powder amount in the tank body to the control module. The control module reduces the rotation speed when the powder amount exceeds the threshold range.

5. The powder can powder discharging device according to claim 4, characterized in that: The capacity sensor is provided on the limiting plate and is used to upload the powder amount F received by the limiting plate to the control module. The control module adjusts the movement period of the rotating shaft to A1 times of the standard value, where A1 = [-(x - 2)^2 + 5] / 2, where 0 ≤ F ≤ 4.

6. The powder can powder discharging device according to claim 1, characterized in that: The scraper is provided with a knocking component. When the driver drives the scraper to make a periodic reciprocating motion around the open position, it drives the knocking component to periodically knock the inner wall of the sandwich layer.

7. A powder tank powder discharging device according to claim 1, characterized in that: Two stirring frames are provided on the side wall of the rotating shaft close to the scraper. Both of the two stirring frames include a bottom edge, a top edge and a side edge. The bottom edges of the two stirring frames are axially symmetric along the rotating shaft. The top edge of one of the stirring frames is closer to the top of the tank body 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 on the side far from the rotating shaft.

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