Digital on-demand powder distribution device

Abstract

The invention discloses a digital on-demand powder distribution device which comprises a material storage barrel and a vibration powder spraying assembly communicated with the material storage barrel. A powder falling structure is arranged in the vibration powder spraying assembly and comprises a powder falling inclined plate, a turning plate and a baffle which are arranged in the powder falling opening. When powder on the powder falling inclined plate is vibrated to the turning plate, the powder does not flow any more after being located at the flowing dead angle of the turning plate, and when vibration is stopped, due to the fact that the friction coefficient between the powder is large, the powder on the powder falling inclined plate can be prevented from falling continuously through the powder at the dead angle, and the trailing of a printed pattern is short; when vibration is stopped, the powder continues to fall due to inertia, the powder between the included angle of the moving repose angle and the included angle of the static repose angle is divided under the action of the baffle, a small part of the powder continues to fall under inertia, and pattern trailing is further shortened due to the fact that the falling powder is small at the moment; under the combined action of the turning plate and the baffle, the powder falling / stopping time is consistent with the device vibration / stopping time, so that trailing during printing is avoided, and the powder distribution precision is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of digital printers, and in particular to a digital on-demand powder dispensing device. Background Art

[0002] Ceramic tiles are often used to decorate and protect the walls and floors of buildings. With the continuous development of social economy and the continuous improvement of people's living standards, people's demand for ceramic tiles is increasing, and the requirements for the decorative effects of ceramic tiles are also getting higher and higher. At present, in the ceramic manufacturing industry, the decorative texture of whole body tiles is generally mixed and paved, or pneumatically controlled. The conventional mixed paving or pneumatic part cannot achieve the fine distribution of the texture of the whole body tile, and it is even more impossible to make the texture of the brick consistent inside and outside, that is, it is impossible to make the texture inside the brick consistent with the texture on the surface. The texture effect can only be reflected on the surface of the brick, and the texture effect is not natural enough, which is quite different from the texture effect of natural stone. In addition, due to the limited movement speed of the cylinder in pneumatic control of powder distribution, the powder will have a long tail during the opening and closing process, affecting the accuracy of powder distribution. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is that the prior art has defects such as tailing, poor precision of the powder spreading device, and difficulty in spreading powder on demand, thereby providing a digital on-demand powder spreading device.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0005] A digital on-demand powder distribution device comprises a material storage barrel and a vibration powder spraying assembly installed on the same side of the material storage barrel; the vibration powder spraying assembly comprises a vibration chamber installed below the material storage barrel, a powder dropping port is provided on one side of the vibration chamber, a powder dropping structure is provided in the powder dropping port, the powder dropping structure comprises a powder dropping inclined plate located in the powder dropping port and a turning plate located at the mouth of the powder dropping port, the turning plate is connected below the powder dropping inclined plate; a baffle plate is also provided in the powder dropping port and installed above the powder dropping inclined plate at intervals.

[0006] Furthermore, the powder dropping structure has multiple layers evenly spaced apart in the vibration chamber, and the inclination angles of the multiple powder dropping inclined plates in the multiple layers of the powder dropping structure are the same.

[0007] Furthermore, the multi-layer powder falling structure gradually retracts into the vibration chamber from top to bottom.

[0008] Furthermore, the turning plate is an L-shaped turning plate, one end of which is vertically connected to one end of the powder dropping inclined plate close to the powder dropping port, and the other end of the L-shaped turning plate is horizontally arranged at the port of the powder dropping port.

[0009] Furthermore, the powder dropping structure at the bottom layer also includes a bottom plate, and the bottom plate is connected to an end of the powder dropping inclined plate away from the turning plate.

[0010] Furthermore, the material storage barrel is fixedly installed on the top of the vibration powder spraying assembly, and a powder storage cavity communicating with the inner cavity of the vibration cavity is arranged in the material storage barrel.

[0011] Furthermore, a powder outlet is provided at the bottom of the material storage barrel, which is located above the vibration chamber and away from one end of the powder falling structure; one end of the powder outlet is fixedly installed at the bottom of the material storage barrel, and the other end extends into the vibration chamber.

[0012] Furthermore, the vibration powder spraying components are arranged in multiple groups at even intervals along the length direction of the storage barrel.

[0013] Furthermore, the vibration powder spraying assembly also includes a vibration structure located at one side of the material storage barrel and installed above the vibration cavity, and the vibration structure is located directly above the powder falling structure.

[0014] Furthermore, the plurality of vibration structures on the plurality of groups of vibration powder spraying assemblies are independently arranged with each other, and the vibration structure is a core piezoelectric ceramic vibration piece.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. The digital on-demand powder distribution device provided by the present invention stores powder in a storage barrel and enters into a vibration chamber through a position connected to a vibration powder spraying assembly. Due to friction, the powder stops flowing after entering the vibration chamber. When the vibration powder spraying assembly vibrates, the powder falls from the powder dropping port end of the vibration chamber through a powder dropping inclined plate under the action of gravity because the powder moving angle of repose is smaller than the static angle of repose. By arranging a turning plate at the powder dropping port, the powder on the powder dropping inclined plate is vibrated onto the turning plate. The powder at the turning point of the turning plate stops flowing because it is in a dead angle of flow. When the vibration stops, the powder at the turning plate can prevent the powder flowing on the upper powder dropping inclined plate from flowing in the inertia due to the large friction coefficient between the powders. The powder continues to fall under the inertia, so that the tail of the printed pattern obtained by the powder distribution equipment after stopping vibration is shorter, thereby improving the powder distribution accuracy; by arranging a baffle on the powder dropping inclined plate, when the vibration powder spraying assembly stops vibrating, the powder will continue to fall due to inertia, and the powder between the moving repose angle and the static repose angle will be divided by the baffle, and only a small part of the powder continues to fall onto the turning plate under inertia. Since less powder falls at this time, the tail of the printed pattern can be further shortened; with such arrangement, under the joint action of the turning plate and the baffle, the falling / stopping time of the powder is consistent with the vibration / stopping time of the vibration powder spraying assembly, thereby avoiding tailing during powder distribution and effectively ensuring the accuracy of powder distribution and material distribution.

[0017] 2. The digital on-demand powder distribution device provided by the present invention has a powder dropping structure with multiple layers evenly spaced in the vibration chamber, and the multiple powder dropping inclined plates in the multi-layer powder dropping structure have the same inclination angle. With such an arrangement, the powder dropping amount per unit time can be increased through the multi-layer powder dropping structure, thereby improving the powder distribution efficiency; making the inclination angles of the multiple powder dropping inclined plates the same can ensure that the powder dropping amount of the multi-layer powder dropping structure is consistent, thereby ensuring the control of the powder distribution accuracy.

[0018] 3. The digital on-demand powder distribution device provided by the present invention has a multi-layer powder dropping structure that gradually retracts from top to bottom into the vibration chamber. This arrangement can prevent the powder falling from overlapping and colliding when the powder dropping openings of the powder dropping structure are on the same vertical line, thereby affecting the printing effect; at the same time, since the powder distribution nozzle is moving during part of the process, the multi-layer powder dropping structure with the retracted components can make the powder finally fall on the same position during the powder distribution movement, thereby increasing the amount of powder dropped between units while also ensuring the powder distribution accuracy.

[0019] 4. The digital on-demand powder distribution device provided by the present invention has an L-shaped turning plate, one end of the L-shaped turning plate is vertically connected to one end of the powder dropping inclined plate near the powder dropping port, and the other end of the L-shaped turning plate is horizontally arranged at the powder dropping port. With such an arrangement, the friction force is increased by the L-shaped turning plate, the powder is prevented from falling directly through the inclined plate, the amount of powder falling after printing stops is reduced, and the powder distribution tailing is reduced, thereby improving the powder distribution accuracy.

[0020] 5. In the digital on-demand powder distribution device provided by the present invention, the material storage barrel is fixedly installed above the vibration powder spraying assembly, and a powder storage chamber communicating with the inner cavity of the vibration chamber is arranged in the material storage barrel. Such arrangement makes the material storage barrel and the vibration powder spraying assembly fixedly connected, which can prevent the vibration powder spraying assembly from vibrating and causing the material storage barrel to be detached, so that the powder in the powder storage chamber cannot enter the vibration chamber.

[0021] 6. The digital on-demand powder distribution device provided by the present invention has a powder outlet at the bottom of the storage barrel, which is located above the vibration chamber and away from one end of the powder dropping structure; one end of the powder outlet is fixedly installed at the bottom of the storage barrel, and the other end extends into the vibration chamber. In this way, the powder outlet is set at the end away from the powder dropping structure, which can prevent the powder falling from the powder outlet from directly falling on the powder dropping structure and affecting the powder distribution effect.

[0022] 7. The digital on-demand powder distribution device provided by the present invention, the vibration powder spraying assembly also includes a vibration structure located on one side of the storage barrel and installed above the vibration chamber, and the vibration structure is located directly above the powder dropping structure. With such an arrangement, the powder dropping structure can be immediately driven to vibrate and stop when the vibration structure vibrates and stops, thereby achieving consistency between the powder dropping / stopping and the vibration / stopping of the vibration powder spraying assembly, and improving the powder distribution accuracy and powder distribution efficiency.

[0023] 8. The digital on-demand powder spreading device provided by the present invention has multiple vibration structures on multiple groups of vibration powder spraying components that are independently set, and the vibration structure is a core piezoelectric ceramic vibration piece. With such a setting, compared with the traditional powder spreading device that cannot control the powder in the width direction and can only spread a square of powder, the powder spreading device of the present application can independently control the vibration powder spraying component, thereby realizing independent control of high-precision and accurate powder at each point in the width direction, without the need for subsequent process adjustment, and can spread the powder in the desired pattern according to the input image, realizing high-precision digital powder spreading printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A three-dimensional structural diagram of a digital on-demand powder distribution device provided in an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a digital on-demand powder dispensing device provided by an embodiment of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the powder falling structure in the present invention;

[0028] Figure 4 This is a structural schematic diagram of a digital on-demand powder distribution device when no turning plate is provided;

[0029] Figure 5 A schematic diagram of the structure of a digital on-demand powder distribution device provided with a turning plate;

[0030] Figure 6 This is a structural schematic diagram of a digital on-demand powder distribution device when no baffle is provided;

[0031] Figure 7 A schematic diagram of the structure of a digital on-demand powder distribution device provided with a baffle;

[0032] Figure 8 It is a schematic diagram of the structure of the powder distribution of the bottom layer of the powder falling structure in the present invention;

[0033] Fig. 9 This is a schematic diagram of the structure of the powder distribution in the middle layer of the powder falling structure of the present invention;

[0034] Fig.10 It is a schematic diagram of the structure of the upper layer of powder distribution of the powder falling structure in the present invention;

[0035] Fig.11It is a structural diagram of input pattern and powder distribution pattern;

[0036] Fig.12 This is a schematic diagram of the structure of the pattern printed by the traditional powder distribution device;

[0037] Fig.13 This is a structural schematic diagram of a pattern arranged by the digital on-demand powder distribution device provided by the present invention.

[0038] Explanation of the accompanying drawings: 1. Powder storage chamber; 11. Powder outlet; 2. Vibrating powder spraying assembly; 21. Vibrating chamber; 22. Powder falling structure; 221. Bottom plate; 2211. Powder falling inclined plate; 2212. Turning plate; 222. Baffle; 23. Vibrating structure; 31. Inclined powder; 32. Exit powder; 33. Powder at turning point; 34. Flowing powder; 41. Angle powder; 42. Divided powder; 5. Input pattern; 6. Printing pattern without turning plate; 7. Printing pattern without baffle; 8. Similar printing pattern; 91. Bottom layer; 92. Middle layer; 93. Upper layer; 94. Cloth foundation belt. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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 are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figure 1-10 A digital on-demand powder distribution device is shown, comprising a material storage barrel and a vibration powder spraying assembly 2 installed on the same side of the material storage barrel; the vibration powder spraying assembly 2 comprises a vibration chamber 21 installed below the material storage barrel, a powder dropping port is provided on one side of the vibration chamber 21, a powder dropping structure 22 is provided in the powder dropping port, the powder dropping structure 22 comprises a powder dropping inclined plate 2211 located in the powder dropping port and a turning plate 2212 located at the mouth of the powder dropping port, the turning plate 2212 is connected below the powder dropping inclined plate 2211; a baffle 222 is also provided in the powder dropping port and is installed above the powder dropping inclined plate 2211 at intervals.

[0044] In this digital on-demand powder distribution device, powder is stored in a storage barrel and enters into the vibration chamber 21 through a position connected to the vibration powder spraying component 2. Due to friction, the powder stops flowing after entering the vibration chamber 21. When the vibration powder spraying component 2 vibrates, since the powder movement repose angle is smaller than the static repose angle, the powder falls from the powder dropping port end of the vibration chamber 21 through the powder dropping inclined plate 2211 under the action of gravity. By arranging a turning plate 2212 at the powder dropping port, the powder on the powder dropping inclined plate 2211 is vibrated onto the turning plate 2212. The powder at the turning point of the turning plate 2212 stops flowing because it is in a dead angle of flow. When the vibration stops, the powder at the turning plate 2212 can prevent the powder flowing on the upper powder dropping inclined plate 2211 from flowing. The material continues to fall under inertia, so that the tail of the powder spreading pattern obtained by the powder spreading equipment after stopping vibration is shorter, thereby improving the powder spreading accuracy; by setting a baffle 222 on the powder dropping inclined plate 2211, when the vibration powder spraying component 2 stops vibrating, the powder will continue to fall due to inertia, and the powder between the moving repose angle and the static repose angle will be divided under the obstruction of the baffle 222, and only a small part of the powder will continue to fall onto the turning plate 2212 under inertia. Since less powder falls at this time, the tail of the pattern obtained by powder spreading can be further shortened; with such a setting, under the joint action of the turning plate 2212 and the baffle 222, the falling / stopping time of the powder is consistent with the vibration / stopping time of the vibration powder spraying component 2, thereby avoiding tailing during powder spreading and effectively ensuring the accuracy of powder and material spreading.

[0045] In this embodiment, multiple groups of vibration powder spraying components 2 are evenly spaced and arranged along the length direction of the storage barrel. The powder dropping structure 22 in each group of vibration powder spraying components 2 is evenly spaced and arranged in three layers in the vibration chamber 21, and the inclination angles of the multiple powder dropping inclined plates 2211 in the three-layer powder dropping structure 22 are the same. In this way, the powder dropping amount per unit time can be increased through the multi-layer powder dropping structure 22, thereby improving the powder distribution efficiency; making the inclination angles of the multiple powder dropping inclined plates 2211 the same can ensure that the powder dropping amount of the multi-layer powder dropping structure 22 is consistent, thereby ensuring the control of the powder distribution accuracy and achieving accurate powder distribution according to demand.

[0046] In this embodiment, the three-layer powder dropping structure 22 gradually retracts from top to bottom into the vibration chamber 21, and the retracted length is the same. This arrangement can prevent the powder falling from overlapping and colliding when the powder dropping openings of the powder dropping structure 22 are on the same vertical line, thereby affecting the powder spreading effect; at the same time, since the powder spreading nozzle is moving during part of the process, the three-layer powder dropping structure 22 with the components retracted can make the powder finally fall on the same position during the powder spreading movement, thereby increasing the powder spreading amount between units while also ensuring the powder spreading accuracy.

[0047] Specifically, Figure 8-10 As shown, the three-layer powder falling structure 22 is respectively a bottom layer 91, a middle layer 92 and an upper layer 93 from bottom to top. Each layer of the powder falling structure 22 is indented at equal intervals. The indentation distance is set to a. The powder falling height of the powder falling structure 22 of the bottom layer 91 is set to H. When the vibration powder spraying assembly 2 vibrates, the powder falls from the outlet end of the vibration chamber 21.

[0048] Specifically, Figure 8 As shown, cloth powder foundation belt 94 is uniformly moved at a certain speed. When the powder of bottom layer 91 falls on cloth powder foundation belt 94, the powder falling down on middle layer 92 and lower layer still falls in the air.

[0049] Specifically, Fig. 9 As shown, when the cloth powder foundation belt 94 continues to run at a uniform speed, the powder material of the middle layer 92 falls onto the cloth powder foundation belt 94 and overlaps with the powder material falling from the bottom layer 91. The powder material falling from the upper layer 93 is still falling in the air.

[0050] Specifically, Fig.10 As shown, when the powder spreading belt 94 continues to run at a constant speed, the powder in the upper layer 93 falls onto the powder spreading belt 94 and overlaps with the powder falling from the bottom layer 91 and the middle layer 92. Therefore, the multi-layer powder dropping structure 22 can increase the amount of powder spreading per unit time without affecting the powder spreading accuracy.

[0051] In this embodiment, the turning plate 2212 is an L-shaped turning plate 2212, one end of the L-shaped turning plate 2212 is vertically connected to one end of the powder dropping inclined plate 2211 near the powder dropping port, and the other end of the L-shaped turning plate 2212 is horizontally arranged at the powder dropping port. In this arrangement, the friction force is increased by the L-shaped turning plate 2212, the powder is prevented from falling directly through the inclined plate, the amount of powder falling after the powder spreading stops is reduced, and the powder spreading tail is reduced, thereby improving the powder spreading accuracy.

[0052] Specifically, the bottom layer of the powder dropping structure 22 is also provided with a bottom plate 221, one end of the bottom plate 221 is fixed to the inner wall of the vibration chamber 21 away from the powder dropping port, and the other end of the bottom plate 221 is fixedly connected to the end of the powder dropping inclined plate 2211 away from the turning plate 2212.

[0053] In this embodiment, the vibration powder spraying assembly 2 further includes a vibration structure 23 located on one side of the storage barrel and installed above the vibration chamber 21, and the vibration structure 23 is located directly above the powder dropping structure 22. With such an arrangement, the powder dropping structure 22 can be immediately driven to vibrate and stop when the vibration structure 23 vibrates and stops, thereby achieving consistency between the powder dropping / stopping and the vibration / stopping of the vibration powder spraying assembly 2, and improving the powder distribution accuracy and powder distribution efficiency.

[0054] In the present embodiment, the vibration structure 23 is a core piezoelectric ceramic vibration piece, and specifically, a piezoelectric ceramic vibration piece, a vibration motor, a vibration cylinder, etc. can be selected as a vibration source. Specifically, the core piezoelectric ceramic vibration piece vibrates at a high frequency at a resonant frequency during operation, which can increase the amount of powder falling per unit time. By controlling the voltage or duty cycle of the vibration powder spraying assembly 2, the amount of powder falling can be adjusted as needed, and then the consistency of the powder output of each vibration powder spraying assembly 2 can be improved. Specifically, the vibration frequency of the core piezoelectric ceramic vibration piece can reach KHZ, and the number of controllable times per unit time can be increased, thereby achieving the effect of high-precision control of powder falling and improving the resolution of powder distribution.

[0055] In this embodiment, if Figure 12-13 As shown, the multiple vibration structures 23 on the multiple groups of vibration powder spraying components 2 are independently arranged, and the vibration structure 23 is a core piezoelectric ceramic vibration piece. With such an arrangement, compared with the traditional powder spreading device that cannot control the powder in the width direction and can only spread a square of powder, the powder spreading device of the present application can independently control the vibration powder spraying component 2, thereby realizing high-precision and accurate powder at each point in the width direction independently, without the need for subsequent process adjustment, and the required pattern can be arranged according to the input image, realizing high-precision digital powder spreading printing.

[0056] In this embodiment, the material storage barrel is fixedly mounted on the top of the vibration powder spraying assembly 2, and a powder storage chamber 1 is provided in the material storage barrel, which is communicated with the inner cavity of the vibration chamber 21. In this way, the material storage barrel and the vibration powder spraying assembly 2 are fixedly connected, which can prevent the vibration powder spraying assembly 2 from vibrating and causing the material storage barrel to be detached, so that the powder in the powder storage chamber 1 cannot enter the vibration chamber 21.

[0057] In this embodiment, a powder outlet 11 is provided at the bottom of the storage barrel, which is located above the vibration chamber 21 and away from one end of the powder falling structure 22; one end of the powder outlet 11 is fixedly installed at the bottom of the storage barrel, and the other end extends into the vibration chamber 21. In this way, the powder outlet 11 is arranged at the end away from the powder falling structure 22, which can prevent the powder falling from the powder outlet 11 from directly falling on the powder falling structure 22 and affecting the powder distribution effect.

[0058] In an alternative embodiment, one end of the powder dropping inclined plate 2211 close to the powder outlet 11 can be lengthened and extended, so as to increase the powder moving when the powder dropping inclined plate 2211 vibrates, thereby further increasing the powder distribution amount of each powder dropping structure 22 per unit time.

[0059] Working principle:

[0060] The powder is stored in the powder storage chamber 1, and the powder enters the vibration chamber 21 through the bottom powder outlet 11; due to friction, the powder stops flowing in the vibration chamber 21 of the vibration powder spraying assembly 2; when the vibration powder spraying assembly 2 vibrates, the powder falls from the outlet end of the vibration chamber 21 under the action of gravity because the powder movement repose angle is smaller than the static repose angle. The angle of the powder falling inclined plate 2211 in the vibration chamber 21 of the vibration powder spraying assembly 2 is smaller than the powder movement repose angle, and an L-shaped turning plate 2212 is provided on the powder falling inclined plate 2211 at the outlet end of the vibration chamber 21, which is conducive to the stopping of the powder. A baffle 222 is provided on the powder falling inclined plate 2211, and there is a small gap between the baffle 222 and the powder falling inclined plate 2211 when the powder is static. When the vibration powder spraying assembly 2 stops vibrating, the baffle 222 prevents the powder from falling freely, so that the powder falls / stops at the same time as the vibration / stop time of the vibration powder spraying assembly 2, avoiding tailing and ensuring the powder distribution accuracy.

[0061] like Figure 4 As shown in FIG. 2 , when the L-shaped turning plate 2212 is not provided, the inclined powder material 3131 flows on the powder falling inclined plate 2211 when the vibrating powder spraying assembly 2 vibrates, and the outlet powder 32 at the powder falling port is in a flowing state. When the vibrating powder spraying assembly 2 stops vibrating, due to the low friction coefficient between the powder falling inclined plate 2211 and the powder, the outlet powder 32 at the powder falling port and the flowing powder 34 continue to fall for a long time under inertia, resulting in the pattern obtained by the powder distribution being longer than the input pattern 5 (such as Fig.11 The non-turning plate printing pattern shown is 6).

[0062] like Figure 5As shown in FIG. 2 , when an L-shaped turning plate 2212 is provided, the powder 35 flows on the L-shaped turning plate 2212 when the vibrating powder spraying assembly 2 vibrates, and the powder 33 at the turning point of the turning angle on the L-shaped turning plate 2212 is in a dead angle of flow and is stationary. When the vibrating powder spraying assembly 2 stops vibrating, due to the large friction coefficient between the powders, the powder 33 at the turning point on the L-shaped turning plate 2212 can prevent the flowing powder from continuing to fall under inertia, and the pattern obtained by the powder spreading has a shorter tail (such as Fig.11 The non-blocking printing pattern shown is 7).

[0063] like Figure 6 As shown, when the baffle 222 is not provided, when the vibration powder spraying assembly 2 vibrates, the angle powder 41 flows on the L-shaped turning plate 2212. When the vibration powder spraying assembly 2 stops vibrating, the angle powder 41 between the moving repose angle and the static repose angle continues to fall under inertia. Since the angle powder 41 is longer, the pattern obtained by the powder distribution is longer than the input pattern (compared to the input pattern). Fig.11 The non-turning plate powder distribution pattern 6 shown is the same).

[0064] like Figure 7 As shown in FIG. 2 , when the baffle plate 222 is provided, the powder flows on the L-shaped turning plate 2212 when the vibrating powder spraying assembly 2 vibrates. When the vibrating powder spraying assembly 2 stops vibrating, the powder between the moving repose angle and the static repose angle is divided under the obstruction of the baffle plate 222, and the divided powder 42 continues to fall at the powder drop port due to inertia. Since the divided powder 42 is shorter in length, the tail of the printed pattern is shorter (compared to the Fig.11 The same as the non-blocking print pattern 7 shown).

[0065] Therefore, by using the L-shaped turning plate 2212 and the baffle plate 222 structure at the same time, the powder distribution accuracy can be improved, and the printed pattern can be closer to the input pattern 5 (such as Fig.11 Similar printed pattern shown in 8).

[0066] In summary, in this digital on-demand powder distribution device, powder is stored in a storage barrel and enters into the vibration chamber 21 through a position connected to the vibration powder spraying component 2. Due to friction, the powder stops flowing after entering the vibration chamber 21. When the vibration powder spraying component 2 vibrates, since the powder movement angle of repose is smaller than the static angle of repose, the powder falls from the powder dropping port end of the vibration chamber 21 through the powder dropping inclined plate 2211 under the action of gravity. By arranging a turning plate 2212 at the powder dropping port, the powder on the powder dropping inclined plate 2211 is vibrated onto the turning plate 2212. The powder at the turning point of the turning plate 2212 stops flowing because it is in a dead angle of flow. When the vibration stops, the powder at the turning plate 2212 can prevent the powder from flowing on the upper powder dropping inclined plate 2211 because the friction coefficient between the powders is large. The moving powder continues to fall under inertia, so that the tail of the powder spreading pattern obtained by the powder spreading equipment after the vibration stops is shorter, thereby improving the printing accuracy; by setting a baffle 222 on the powder dropping inclined plate 2211, when the vibration powder spraying assembly 2 stops vibrating, the powder will continue to fall due to inertia, and the powder between the moving repose angle and the static repose angle will be divided under the obstruction of the baffle 222, and only a small part of the powder will continue to fall onto the turning plate 2212 under inertia. Since less powder falls at this time, the tail of the pattern obtained by the powder spreading can be further shortened; with such a setting, under the joint action of the turning plate 2212 and the baffle 222, the falling / stopping time of the powder is consistent with the vibration / stopping time of the vibration powder spraying assembly 2, thereby avoiding tailing during powder spreading and effectively ensuring the accuracy of powder spreading.

[0067] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A digital on-demand powder distribution device, characterized in that: The invention comprises a material storage barrel and a vibration powder spraying assembly (2) installed on the same side of the material storage barrel; the vibration powder spraying assembly (2) comprises a vibration chamber (21) installed below the material storage barrel, a powder dropping opening is arranged on one side of the vibration chamber (21), a powder dropping structure (22) is arranged in the powder dropping opening, the powder dropping structure (22) comprises a powder dropping inclined plate (2211) located in the powder dropping opening and a turning plate (2212) located at the mouth of the powder dropping opening, the turning plate (2212) is connected below the powder dropping inclined plate (2211); a baffle (222) is also arranged in the powder dropping opening and installed above the powder dropping inclined plate (2211) at intervals.

2. The digital on-demand powder distribution device according to claim 1, characterized in that: The powder dropping structure (22) is evenly spaced in multiple layers in the vibration chamber (21), and the inclination angles of the multiple powder dropping inclined plates (2211) in the multiple layers of the powder dropping structure (22) are the same.

3. The digital on-demand powder distribution device according to claim 2, characterized in that: The multi-layer powder falling structure (22) gradually retracts into the vibration chamber (21) from top to bottom.

4. The digital on-demand powder distribution device according to claim 1, characterized in that: The turning plate (2212) is an L-shaped turning plate (2212), one end of which is vertically connected to one end of the powder dropping inclined plate (2211) close to the mouth of the powder dropping port, and the other end of the L-shaped turning plate (2212) is horizontally arranged at the mouth of the powder dropping port.

5. The digital on-demand powder distribution device according to claim 2, characterized in that: The powder dropping structure (22) at the bottom layer further comprises a bottom plate (221), and the bottom plate (221) is connected to an end of the powder dropping inclined plate (2211) away from the turning plate (2212).

6. The digital on-demand powder distribution device according to claim 1, characterized in that: The material storage barrel is fixedly mounted on the top of the vibration powder spraying assembly (2), and a powder storage chamber (1) communicating with the inner cavity of the vibration chamber (21) is provided in the material storage barrel.

7. The digital on-demand powder distribution device according to claim 6, characterized in that: The bottom of the material storage barrel is provided with a powder outlet (11) located above the vibration chamber (21) and away from one end of the powder falling structure (22); one end of the powder outlet (11) is fixedly mounted on the bottom of the material storage barrel, and the other end extends into the vibration chamber (21).

8. The digital on-demand powder distribution device according to claim 1, characterized in that: The vibration powder spraying components (2) are arranged in multiple groups at even intervals along the length direction of the storage barrel.

9. The digital on-demand powder distribution device according to claim 8, characterized in that: The vibration powder spraying assembly (2) further comprises a vibration structure (23) located on one side of the material storage barrel and installed above the vibration chamber (21); the vibration structure (23) is located above the powder falling structure (22).

10. The digital on-demand powder distribution device according to claim 9, characterized in that: The plurality of vibration structures (23) on the plurality of groups of vibration powder spraying components (2) are independently arranged with each other, and the vibration structure (23) is a core piezoelectric ceramic vibration piece.

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