Stock bin, 3D printing feeding device and 3D printing equipment

Abstract

The stock bin comprises a shell, a base, a draught fan and a heating piece, the base is contained in the shell and provided with a base area, the base comprises a supporting shaft used for supporting a material disc, the area below the plane penetrating through the axis of the supporting shaft and parallel to the bottom wall of the shell is the base area, and the material disc is placed in the base area; an airflow cavity is formed between the base and the bottom wall of the shell, the base is provided with a first air hole and a second air hole, and the first air hole and the second air hole are formed in the annular direction of the tray at intervals and communicate with the base area and the airflow cavity correspondingly; the draught fan and the heating piece are contained in the airflow cavity, the draught fan is arranged close to the first air hole, and an air outlet of the draught fan faces one side of the second air hole. According to the stock bin, the problem that the effect of drying the trays in an existing 3D printing feeding device is poor can be solved.

Description

[0001] The present invention is based on the PCT international application with application number PCT / CN2024 / 116181, application date August 31, 2024, and invention name “Silo, 3D printing feeding device and 3D printing equipment”, and claims the priority of the above PCT international application. The entire contents of the above PCT international application are hereby introduced into the present invention as a reference. Technical Field

[0002] The present invention relates to the technical field of 3D printing, and in particular to a material bin, a 3D printing feeding device and a 3D printing device. Background Art

[0003] 3D printing equipment (also known as three-dimensional printers, stereo printers) construct three-dimensional objects by printing layer by layer. The 3D printing equipment includes a print head for extruding printing materials and a printing platform for depositing printing materials to form a three-dimensional object. The print head is configured to move relative to the printing platform and extrude the printing materials onto the surface of the printing platform while moving. The printing materials are deposited layer by layer on the surface of the printing platform and fused together to print a three-dimensional object.

[0004] With the development of 3D printing technology, people have an increasing demand for the diversified colors or materials of printed objects. How to meet the diverse needs of printed objects has gradually become a research hotspot. Summary of the invention

[0005] The purpose of the present invention is to provide a silo, a 3D printing feeding device and a 3D printing equipment to solve the problem of poor drying effect of the internal drying tray of the existing 3D printing feeding device.

[0006] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0007] In the first aspect, the present invention provides a silo for a 3D printing feeding device, comprising a shell, a base, and a fan heating element, wherein the base is accommodated in the shell, the base has a base area, the base includes a support shaft for supporting a material tray, the area below the plane passing through the axis of the support shaft and parallel to the bottom wall of the shell is the base area, the material tray is placed in the base area, an air flow cavity is provided between the base and the bottom wall of the shell, the base is provided with a first air hole and a second air hole, the first air hole and the second air hole are spaced apart in the circumferential direction of the material tray, the first air hole and the second air hole are connected to the base area and the air flow cavity respectively; a fan and a heating element are accommodated in the air flow cavity, the fan is arranged adjacent to the first air hole, and the air outlet of the fan faces the side of the second air hole.

[0008] In one embodiment, the shape of the bottom wall of at least a portion of the base area is adapted to the outer contour of the material tray, and along the circumferential direction of the material tray, the length L1 of the arc formed by the line connecting the first air hole and the second air hole is 90 mm to 180 mm.

[0009] In one embodiment, a first pore group and a second pore group are provided on the base, the first pore group includes a plurality of the first pores, and the second pore group includes a plurality of the second pores; the plurality of the first pores are arranged in an array, and the second pores are arranged in an array; the number of the first pore groups is multiple, the number of the second pore groups is multiple, and along the axial direction of the material tray, the plurality of the first pore groups are spaced apart in sequence, and the plurality of the second pore groups are spaced apart in sequence.

[0010] In one embodiment, the base area is divided into a plurality of receiving grooves, any one of the receiving grooves is used to receive a portion of the material tray, the number of the fans is multiple, and at least one of the fans exchanges gas with two of the receiving grooves through the first air holes.

[0011] In one embodiment, an air inlet hole is opened on the bottom wall and / or side panel of the shell, and the air inlet of the fan is inclined relative to the bottom wall of the shell, and the inclination angle α formed by the air inlet surface where the air inlet of the fan is located and the bottom wall of the shell is 12°~30°.

[0012] In one embodiment, the fan has at least one air inlet, one of which faces the bottom wall of the housing, and the orthographic projection of the air inlet on the bottom wall of the housing at least partially overlaps with the air inlet hole, or the distance between the air inlet and the air inlet hole is 10mm-32mm.

[0013] In one embodiment, air outlet holes are provided on the side panels and / or the bottom wall of the housing, and the air outlet holes are connected to the airflow cavity.

[0014] In one embodiment, the silo also includes an air guide hood, which is accommodated in the air flow cavity, and the air guide hood is connected to the base, and the air guide hood divides the air flow cavity into a first air flow cavity and a second air flow cavity; the fan and the heating element are accommodated in the first air flow cavity, and the first air hole and the second air hole are connected to the base area and the first air flow cavity respectively; the fan has two air inlets, and the fan sucks the airflow of the first air hole through one of the air inlets and discharges it through the second air hole.

[0015] In one embodiment, a guide plate is connected to the air guide cover, and the guide plate is accommodated in the first air flow cavity. The air outlet of the fan faces the guide plate, and the heating element is located between the first air hole and the second air hole, and the projection of the heating element and the axis of the material tray on the bottom wall of the outer shell overlaps.

[0016] In one embodiment, the air guide hood extends in an L shape, and includes a first extension portion and a second extension portion that intersect each other, the space in the first extension portion is connected to the space in the second extension portion, the fan and the heating element are located in the first extension portion, the guide plate is located in the second extension portion, and the guide plate extends in an S shape in the second extension portion.

[0017] In one embodiment, the outer shell includes a first side panel, a third side panel, a second side panel and a fourth side panel which are connected in sequence in a ring shape, the air inlet is close to the first side panel and the third side panel, and the air outlet is opened on the fourth side panel or is opened on the second side panel and arranged close to the fourth side panel.

[0018] In one embodiment, the air inlet is close to the first side panel and the fourth side panel, and the air outlet is opened on the third side panel or opened on the second side panel and arranged close to the third side panel; so that the air inlet and the air outlet are arranged along the diagonal of the outer shell.

[0019] In one embodiment, a straight-line distance L2 from the air inlet to the second side panel is 155 mm to 220 mm.

[0020] In one embodiment, a straight-line distance L3 from the air inlet to the air outlet is 270 mm to 450 mm.

[0021] In one embodiment, the silo further includes an air valve, which is disposed at the air inlet and / or the air outlet, and is used to control the opening or closing of the air inlet and / or the air outlet.

[0022] In one embodiment, there are two fans, both of which include a motor side and a blade side, wherein the blade side of one fan faces the air inlet, and the blade side of the other fan faces the first air hole.

[0023] In one embodiment, the base includes two groups of support shafts spaced apart, wherein one group of support shafts is detachably connected to the body of the base, and the airflow cavity is exposed through a notch after the support shafts are disassembled, and the notch is used for placing a desiccant bag.

[0024] In one embodiment, the bottom wall of the base area is arc-shaped, and the first air hole and the second air hole are arranged on the arc-shaped bottom wall of the base area. In the height direction of the silo, there is a third distance between the first air hole and the edge of the material tray, there is a fourth distance between the second air hole and the edge of the material tray, and there is a fifth distance between the lowest point of the edge of the material tray and the base, wherein the third distance and the fourth distance are both greater than the fifth distance.

[0025] In a second aspect, the present invention further provides a 3D printing feeding device, which includes a material tray and the material bin described in the above embodiments, wherein the receiving groove is used to receive the material tray, and the material tray is used to carry materials.

[0026] In a third aspect, the present invention further provides a 3D printing device, which includes a 3D printer and the 3D printing feeding device described in the second aspect.

[0027] The present invention provides a first air hole and a second air hole on the base, and the first air hole and the second air hole are arranged in an annular manner along the outer periphery of the material tray, so that the first air hole and the second air hole correspond to different positions on the outer periphery of the material tray. At the same time, the fan is set at a position adjacent to the first air hole. When the fan is started, a negative pressure is formed near the fan, so that the gas in the base area flows into the fan through the first air hole; then the air outlet of the fan is directed toward the second air hole, so that a positive pressure is formed at the second air hole, and the gas in the air flow cavity flows back to the base area through the second air hole, and the air flow forms an annular air flow along the outer periphery of the material tray, thereby efficiently drying the material tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is an external view of a silo in one embodiment;

[0030] Figure 2 is a top view of the interior of a housing in one embodiment;

[0031] Figure 3 is a cross-sectional view of a housing and a tray in one embodiment;

[0032] Figure 4 is a rear view of a base including an air scoop according to an embodiment;

[0033] Figure 5 is a rear view of a base in one embodiment;

[0034] Figure 6 is an internal top view of an air scoop according to an embodiment;

[0035] Figure 7 is an internal side view of an air scoop according to an embodiment;

[0036] Figure 8 is a top view of the interior of a housing of one embodiment;

[0037] Fig. 9 A partial cross-sectional view of a silo according to an embodiment.

[0038] Description of reference numerals:

[0039] 1000-bin, 1100-shell, 1110-cover, 1120-housing, 111A-air inlet, 111B-air outlet, 1111-first side plate, 1112-second side plate, 1113-third side plate, 1114-fourth side plate, 1130-base, 113A-first air hole, 113B-second air hole, 1131-first air hole group, 1132-second air hole group, 1133-support shaft, 1 140-base area, 1141-receiving slot, 1150-air flow chamber, 1151-first air flow chamber, 1152-second air flow chamber, 1153-drying slot, 1160-air guide cover, 1161-air flow opening, 1162-first extension part, 1163-second extension part, 1170-guide plate, 1200-fan, 1300-heating element, 1400-air valve, 2000-material tray, 3000-desiccant bag. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0042] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0043] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] The present invention provides a silo for a 3D printing feeding device, the silo is used to store a material tray, and in a specific embodiment, a plurality of material trays can be placed in the silo provided by the present invention, and the silo can output the material on at least one of the material trays. Optionally, the material tray is a rotating body that can rotate around an axis, such as a disc-shaped material tray, the material tray includes a disc body and a linear material (hereinafter referred to as material) wound on the disc body, the material is wound around the disc body in circles, and when the material needs to be output, the silo drives the material tray to rotate, so that the rotation of the disc body drives the material to be released from the disc body.

[0045] In one implementation, please refer to Figure 1-Figure 3 The silo 1000 includes a housing 1100, a fan 1200 and a heating element 1300, wherein the fan 1200 and the heating element 1300 are housed in the housing 1100, and the fan 1200 is used to create an environment of internal circulation of airflow and external circulation of airflow inside the housing 1100. The housing 1100 has a base area 1140 and an airflow cavity 1150, wherein the base area 1140 is used to accommodate the material tray 2000, and the airflow cavity 1150 is used to accommodate the fan 1200. The base area 1140 and the airflow cavity 1150 exchange gas through the fan 1200. In a specific embodiment, the fan 1200 can draw gas from some positions in the base area 1140 to other positions to create an internal circulation of airflow; in other specific embodiments, the fan 1200 can draw external air into the base area 1140 to create an external circulation of airflow, and in the dehumidification working mode, the humid air in the silo can be taken away to ensure a dry environment in the base area 1140. The heating element 1300 may be located at the air outlet of the fan 1200 and arranged on the air outlet path of the fan 1200 , so as to utilize the heating element 1300 to dry the airflow blown out by the fan 1200 .

[0046] In one embodiment, the housing 1100 includes a cover 1110, a shell 1120, and a base 1130. The shell 1120 encloses a chamber with an opening at one end, and the base 1130 is installed in the chamber from the opening. The cover 1110 and the shell 1120 are movably connected, and the cover 1110 and the shell 1120 can be opened and closed; preferably, the cover 1110 and the shell 1120 are rotatably connected; the base 1130 separates the airflow cavity 1150 and the base area 1140.

[0047] In one embodiment, the shape of the cover body 1110 is adapted to the shape of the material tray 2000, the inner wall contour of the cover body 1110 is the same as the outer peripheral contour of the material tray 2000, and a partial gap is retained between the inner wall of the cover body 1110 and the material tray 2000, and the spacing of the gaps is uniform, so that the cross-sectional area of ​​the airflow path formed between the cover body 1110 and the material tray 2000 is basically consistent, thereby obtaining a smoother airflow path, and at the same time reducing the gas in the silo, which is convenient for sealing and keeping dry.

[0048] In one embodiment, the base 1130 is an integrally formed structure, and its manufacturing and forming methods include but are not limited to injection molding, molding, 3D printing, etc. It can be understood that the base 1130 is a large integrally formed part, and the base 1130 is composed of some horizontal / vertical ribs and partitions, some of the horizontal / vertical ribs or partitions are connected to the inner wall of the shell 1120, and some of the horizontal / vertical ribs or partitions are connected to each other, so the space in the base 1130 is obtained by dividing the chamber in the shell 1120 by the horizontal / vertical ribs or partitions.

[0049] In one embodiment, the base 1130 may also be an integral structure with the housing 1100, specifically, the base 1130 and the housing 1120 are an integral structure. In this embodiment, the base area 1140 refers to the space between the base 1130 and the cover 1110, and the tray 2000 is accommodated in the space enclosed by the base area 1140 and the cover 1110.

[0050] In one embodiment, the material tray has a rotation axis, and a set of support shafts are arranged at the axis. The base area 1140 is located below the plane parallel to the bottom wall plane of the housing 1120 and passing through the support axis. Figure 2 and Figure 3An airflow cavity 1150 is provided between the base 1130 and the bottom wall of the housing 1120, a base area 1140 is formed between the base 1130 and the cover 1110, and the material tray 2000 is placed on the base 1130. The base 1130 includes two groups of support shafts 1133 arranged at intervals, and the area between the two groups of support shafts 1133 is the base area 1140, and the material tray 2000 is placed in the base area 1140. Specifically, the base area 1140 is provided below a plane parallel to the bottom wall plane of the housing 1120 and passing through any group of support axes, or the base area 1140 is provided below a plane passing through the two groups of support axes arranged at intervals.

[0051] It can be understood that both the cover 1110 and the base 1130 have an arc-shaped structure adapted to the material tray 2000, so that the cover 1110 and the base 1130 surround the material tray 2000. The cover 1110 is opened to expose the opening of the housing 1120, the material tray 2000 is placed in the base area 1140 through the opening, and the material tray 2000 is placed on the base 1130. The cover 1110 is closed to close the base area 1140, and the material tray 2000 outputs the material through the perforations on the housing 1120.

[0052] In one implementation, please refer to Figure 2 and Figure 3 The shell 1100 is provided with a first air hole 113A and a second air hole 113B, which are spaced apart in the circumferential direction of the material tray 2000, and the first air hole 113A and the second air hole 113B are connected to the base area 1140 and the air flow cavity 1150 respectively. Specifically, the first air hole 113A and the second air hole 113B are both opened on the base 1130. It can be understood that the base 1130 has an arc structure adapted to the material tray 2000, so it can be understood that the first air hole 113A and the second air hole 113B are spaced apart in the circumferential direction of the material tray 2000; and along the height direction of the silo 1000, the first air hole 113A and the second air hole 113B are both located in the base area 1140. By arranging the first air hole 113A and the second air hole 113B below the support shaft 1133, the air flow can be sucked in and blown out by the fan from the bottom area of ​​the material tray 2000, so that the air flow path blown out by the fan 1200 can cover more areas of the material tray, thereby improving the drying effect.

[0053] In one implementation, please refer to Figure 2 and Figure 3, the fan 1200 is accommodated in the airflow cavity 1150 and is arranged adjacent to the first air hole 113A, and the air outlet of the fan 1200 faces the side of the second air hole 113B. Specifically, the fan 1200 is located below the material tray 2000, that is, the fan 1200 is installed on the side of the base 1130 facing away from the material tray 2000. Because the fan 1200 is arranged adjacent to the first air hole 113A, when the fan 1200 is started, negative pressure will be generated near the fan 1200, so that the gas in the base area 1140 flows into the airflow cavity 1150 through the first air hole 113A. At the same time, the air outlet of the fan 1200 faces the side of the second air hole 113B, so that the fan 1200 blows the gas toward the second air hole 113B, so that the gas in the airflow cavity 1150 flows back to the base area 1140 through the second air hole 113B.

[0054] In one embodiment, the material tray 2000 includes a tray body and a linear material (hereinafter referred to as material) wound around the tray body, and the material is wound around the tray body in circles. When the material needs to be output, the silo 1000 drives the tray 2000 to rotate, so that the rotation of the tray body drives the material to be released from the tray body. Among them, there is a first spacing between the first air hole 113A and / or the second air hole 113B and the material, and there is a second spacing between the first air hole 113A and / or the second air hole 113B and the tray body, and the first spacing is greater than the second spacing. In this way, the airflow can be mainly circulated through the area of ​​the material to avoid wind short-circuiting; and the space at the material is larger, and the larger airflow volume has a better drying effect on the material. In one embodiment, please refer to Figure 3 , in the height direction of the silo 1000, there is a third spacing A1 between the first air hole 113A and the edge of the tray 2000, there is a fourth spacing A2 between the second air hole 113B and the edge of the tray 2000, and there is a fifth spacing A3 between the lowest point of the edge of the tray 2000 and the base 1130, wherein the third spacing A1 and the fourth spacing A2 are both greater than the fifth spacing A3. It should be noted that the lowest point of the tray 2000 refers to the point where the tray 2000 is closest to the bottom wall of the shell 1120 in the height direction of the silo 1000. Since the tray 2000 is circular, when the tray 2000 is placed vertically, its periphery (the periphery is an arc shape) must have the lowest point. Optionally, the third spacing A1 is greater than the fourth spacing A2, that is, A1>A2>A3. Since the sizes of the third spacing A1 and the fourth spacing A2 are both large, it means that the material tray 2000 is in a higher position in the two places. Such a setting can make the airflow circulate mainly through the side of the material tray 2000 away from the base 1130 area, and the hot air inside the silo 1000 will diffuse upward instead of downward, thereby avoiding the problem of wind short circuit.

[0055] It should be noted that the distances between the first air hole 113A and the second air hole 113B and the tray 2000 are measured in the following manner: in a plane perpendicular to the axis of the tray, along the height direction perpendicular to the bottom wall of the housing 1120, the distances between the shape centers of the first air hole 113A and the second air hole 113B and the edge of the tray are taken as the third spacing A1, the fourth spacing A2 and the fifth spacing A3. When the air holes are in an array, the shape center of the array is selected as the measuring point.

[0056] The present invention provides a first air hole 113A and a second air hole 113B on the housing 1100, and the first air hole 113A and the second air hole 113B are arranged in an annular manner along the outer periphery of the material tray 2000, so that the first air hole 113A and the second air hole 113B correspond to different positions on the outer periphery of the material tray 2000. At the same time, the fan 1200 is arranged at a position adjacent to the first air hole 113A. When the fan 1200 is started, a negative pressure is formed near the fan 1200, so that the gas in the base area 1140 flows into the fan 1200 through the first air hole 113A; then the air outlet of the fan 1200 faces the second air hole 113B, so that a positive pressure is formed at the second air hole 113B, and the gas in the airflow cavity 1150 flows back to the base area 1140 through the second air hole 113B, and the airflow forms an annular airflow along the outer periphery of the material tray 2000, thereby efficiently drying the material tray 2000.

[0057] In one implementation, please refer to Figure 2 , at least part of the bottom wall of the base area 1140 is in an arc shape, so as to adapt to the outer contour of the material tray 2000, and the first air hole 113A and the second air hole 113B are arranged on the arc bottom wall of the base area 1140, so that the first air hole 113A and the second air hole 113B can adapt to the outer contour of the material tray 2000, so as to make the air flow path smoother. Along the circumferential direction of the material tray 2000, the arc length L1 formed by the connecting line between the first air hole 113A and the second air hole 113B is 90mm to 180mm. Specifically, the annular distance between the first air hole 113A and the second air hole 113B refers to the length of the arc formed by the nearest end of the first air hole 113A close to the second air hole 113B and the nearest end of the second air hole 113B close to the first air hole 113A along the annular direction. Because the bottom wall of the base area 1140 is adapted to the outer circumference of the material tray 2000, the bottom wall of the base area 1140 will also be arc-shaped, so there is an annular distance. Optionally, the length L1 of the arc formed by the line connecting the first air hole 113A and the second air hole 113B can be 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm.

[0058] It should be noted that the connection line between the first air hole 113A and the second air hole 113B is measured by projecting the corresponding arc line of the first air hole 113A and the second air hole 113B in a plane perpendicular to the axis of the support shaft. When the air holes are arrays, the shape center of the array is selected as the measurement point.

[0059] The present invention sets the annular distance between the first air hole 113A and the second air hole 113B to the above-mentioned range to ensure that the first air hole 113A and the second air hole 113B have a certain distance, thereby avoiding the interference of the airflows of the first air hole 113A and the second air hole 113B to form turbulence; and, the first air hole 113A and the second air hole 113B are at the above-mentioned distance, so that the air intake of the first air hole 113A and the air outlet of the second air hole 113B can adapt to the material tray 2000 to form an annular airflow surrounding the material tray 2000, and the annular airflow can cover most areas of the material tray, thereby utilizing the annular airflow to fully dry the material tray 2000.

[0060] In one implementation, please refer to Figure 2 The shell 1100 is provided with a first pore group 1131 and a second pore group 1132. The first pore group 1131 includes a plurality of first pores 113A, and the second pore group 1132 includes a plurality of second pores 113B; the plurality of first pores 113A are arranged in multiple rows and / or multiple columns, and the second pores 113B are arranged in multiple rows and / or multiple columns. Specifically, the first pore group 1131 includes a plurality of first pores 113A arranged in multiple rows and / or multiple columns, so the position of the first pore group 1131 forms a mesh structure; the first pore group 1131 includes a plurality of second pores 113B arranged in multiple rows and / or multiple columns, so the position of the second pore group 1132 forms a mesh structure. Optionally, the row direction of the first pore group 1131 is the same as the row direction of the second pore group 1132, and the column direction of the first pore group 1131 is the same as the column direction of the second pore group 1132.

[0061] In one embodiment, the hole shape of the first pore group 1131 and / or the second pore group 1132 is a circle center, the first pore 113A located in the outer layer of the first pore group 1131 has a first aperture, the first pore 113A located in the middle of the first pore group 1131 has a second aperture, wherein the first aperture is smaller than the second aperture. The second pore 113B located in the outer layer of the second pore group 1132 has a third aperture, the second pore 113B located in the middle of the second pore group 1132 has a fourth aperture, wherein the third aperture is smaller than the fourth aperture.

[0062] The present invention provides a first pore group 1131 and a second pore group 1132 with a mesh structure, so that the first pore group 1131 and the second pore group 1132 have the effect of a sieve, which can block the impurities in the base area 1140 and the airflow cavity 1150 from moving with the airflow, thereby preventing impurities and dust from affecting the material tray 2000 or components inside the silo 1000; at the same time, the pore group with a mesh structure also disperses the impact force of the airflow and stabilizes the airflow, reducing turbulence caused by airflow dispersion at the first pore 113A and the second pore 113B.

[0063] In one implementation, please refer to Figure 2 , there are multiple first pore groups 1131, and there are multiple second pore groups 1132, and along the axial direction of the material tray 2000, multiple first pore groups 1131 are arranged in sequence and at intervals, and multiple second pore groups 1132 are arranged in sequence and at intervals. Specifically, there can be multiple first pore groups 1131, and multiple groups of first pore groups 1131 are arranged in sequence and at intervals along the axial direction of the material tray 2000, and each first pore group 1131 includes multiple first pores 113A; there can be multiple second pore groups 1132, and multiple groups of second pore groups 1132 are arranged in sequence and at intervals along the axial direction of the material tray 2000, and each second pore group 1132 includes multiple second pores 113B.

[0064] The present invention can be used for multiple material trays 2000 in the corresponding base area 1140 by setting the number of first pore groups 1131 and second pore groups 1132, and the pore groups arranged axially can increase the air flow density near the material tray 2000 so that each material tray 2000 can be fully dried.

[0065] In one implementation, please refer to Figure 2 The base area 1140 is divided into a plurality of receiving slots 1141, any one of which is used to receive a portion of a tray 2000. There are a plurality of fans 1200, and at least one fan 1200 exchanges gas with two of the receiving slots 1141 through the first air holes 113A. Specifically, at least one partition plate is provided on the bottom wall of the base area 1140, and the partition plate divides part of the base area 1140 to form receiving slots 1141, and the receiving slots 1141 are used to independently receive a portion of a tray 2000. There are also a plurality of fans 1200, and the number of fans 1200 can be the same as the number of receiving slots 1141, and they supply air to the receiving slots 1141 accordingly. The number of fans 1200 can also be less than the number of receiving slots 1141, so that at least one fan 1200 needs to supply air to two receiving slots 1141.

[0066] The present invention can be distinguished from the single fan 1200 solution in the prior art by providing multiple fans 1200 corresponding to multiple material trays 2000. Increasing the number of fans 1200 improves the airflow drying effect in the silo 1000. Furthermore, the airflow density around the material tray 2000 corresponding to the fan 1200 is increased, thereby improving the drying effect of a single material tray 2000.

[0067] In one implementation, please refer to Figure 2 , the silo 1000 is used to receive four material trays 2000, and four receiving grooves 1141 are divided on the base 1130 for receiving four material silos 1000, and the four receiving grooves 1141 are arranged in sequence along the axial direction of the material tray 2000. The number of first pore groups 1131 is two, and the number of second pore groups 1132 is four; along the axial direction of the material tray 2000, the two first pore groups 1131 are respectively opened on the bottom walls of the two outermost receiving grooves 1141, that is, the two first pore groups 1131 are respectively corresponding to the two outermost material trays 2000; along the axial direction of the material tray 2000, the four second pore groups 1132 are respectively and independently opened on the bottom walls of the four receiving grooves 1141, that is, the four first pore groups 1131 are respectively corresponding to the four material trays 2000. The number of fans 1200 is two, and the two fans 1200 correspond to the two first pore groups 1131 independently.

[0068] In one implementation, please refer to Figure 8 The bottom wall and / or side plate of the housing 1120 are provided with air inlet holes 111A, and the side plate and / or bottom wall of the housing 1120 are provided with air outlet holes 111B, and the air outlet holes 111B are connected to the air flow cavity 1150, wherein the air outlet holes 111B and the air inlet holes 111A are respectively arranged on both sides of the projection of the axis of the material tray 2000 on the bottom wall of the housing 1120. Specifically, the fan 1200 draws external gas into the silo 1000 through the air inlet holes 111A on the bottom wall of the housing 1120, and discharges the gas in the silo 1000 through the air outlet holes 111B on the side plate, thereby realizing external circulation.

[0069] By arranging the air outlet 111B on one side of the air flow cavity 1150, the air blown out by the fan 1200 enters the receiving groove 1141 after passing through the heating element 1300, and then flows back to the air flow cavity 1150 through the hole or gap on the base 1130, and then is discharged through the air outlet 111B. In this way, the residence time of the hot air flow in the receiving groove 1141 can be extended, which is beneficial to drying out the water vapor in the wire and increasing the temperature in the air flow cavity.

[0070] In one embodiment, the air inlet of the fan 1200 is tilted relative to the bottom wall of the housing 1120, and the tilt angle α formed by the air inlet surface where the air inlet of the fan 1200 is located and the bottom wall of the housing 1120 is 12° to 30°. Specifically, the fan 1200 is tiltedly installed in the airflow cavity 1150, on the one hand to adapt to the arc shape of the bottom wall of the base area 1140, and on the other hand to inhale air from inside and outside, using the airflow of the airflow cavity 1150 to participate in the internal circulation, improve the air intake efficiency and form a circulation. Because the fan 1200 is tiltedly installed, the second air inlet is close to the first air hole 113A, so that a large negative pressure can be formed at the first air hole 113A, thereby increasing the air intake of the base area 1140. Optionally, the inclination angle α can be 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, or 30°.

[0071] In one embodiment, the fan 1200 has at least one air inlet, one of which faces the bottom wall of the housing 1120, and the orthographic projection of the air inlet of the fan 1200 on the bottom wall of the housing 1120 at least partially overlaps with the air inlet 111A, or the distance between the air inlet and the air inlet 111A is 10 mm to 32 mm. Optionally, the distance between the air inlet and the air inlet 111A can be 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, or 32 mm.

[0072] It should be noted that, in the above-mentioned embodiment, the inclination angle α and the distance measurement position between the air inlet and the air inlet hole 111A are all the air inlet of the fan 1200 or the air inlet surface where the air inlet is located, and the air inlet is the air inlet of the fan 1200 close to (towards) the bottom wall of the housing 1120. At the same time, the measurement reference of the air inlet is the measurement point position of the shape center of the air inlet and the air inlet hole 111A. The orthographic projection method in the above-mentioned embodiment refers to the direction perpendicular to the bottom wall of the housing 1120.

[0073] The present invention opens the air inlet 111A of the silo 1000 on the bottom wall of the shell 1120. When the fan 1200 is working, the fan 1200 forms a negative pressure at the air inlet 111A, sucks in the air outside the silo 1000, and uses the air at the air outlet 111B far away from the fan 1200 to push it out through the air outlet 111B, thereby forming a gas exchange between the inner and outer cavities; and the air intake position of the silo 1000 is adapted to the air inlet of the fan 1200, reducing the airflow path from the air inlet 111A to the fan 1200, thereby improving the air intake efficiency of the fan 1200.

[0074] In one implementation, please refer to Figure 4-Figure 7 The silo also includes an air guide cover 1160, which is accommodated in the air flow cavity 1150. The air guide cover 1160 is accommodated in the air flow cavity 1150, and the air guide cover 1160 is connected to the base 1130. The air guide cover 1160 separates the air flow cavity 1150 to form a first air flow cavity 1151 and a second air flow cavity 1152. The fan 1200 and the heating element 1300 are accommodated in the first air flow cavity 1151. The first air hole 113A and the second air hole 113B are respectively connected to the base area 1140 and the first air flow cavity 1151. The fan 1200 has two air inlets. The fan 1200 sucks the air flow of the first air hole 113A through one of the air inlets and discharges it through the second air hole 113B.

[0075] In one implementation, please refer to Figure 4-Figure 7 The air guide cover 1160 and the base 1130 are detachably connected. The air guide cover 1160 is connected to the side of the base 1130 facing away from the material tray, that is, it is accommodated in the airflow cavity 1150. The air guide cover 1160 is used to separate the airflow cavity 1150 into two areas, namely the first airflow cavity 1151 and the second airflow cavity 1152, wherein the first airflow cavity 1151 is enclosed by the base 1130 and the air guide cover 1160, and the second airflow cavity 1152 is connected to the external space through the air inlet hole 111A. The airflow opening 1161 is opened on the air guide cover 1160, and it is preferred that the air inlet of the fan 1200 is opposite to the airflow opening 1161. Therefore, the fan 1200 can draw the airflow in the second airflow chamber 1152 into the first airflow chamber 1151 through the airflow opening 1161, and then the gas blown out by the fan 1200 is located in the first airflow chamber 1151 and is heated by the heating element 1300 in the first airflow chamber 1151. It can be understood that, except for the airflow opening 1161, the first airflow chamber 1151 and the second airflow chamber 1152 are separated by the wind guide cover, so that there is no airflow passage between the first airflow chamber 1151 and the second airflow chamber 1152. In other words, in the external circulation airflow mode, the external air first flows into the second airflow chamber 1152 through the airflow opening 1161, and then is sucked into the first airflow chamber 1151 by the fan 1200, enters the base area 1140 after being heated, flows through the surface of the material tray, and then flows into the second airflow chamber 1152 through the holes or gaps on the base, and can be discharged from the material bin through the air outlet 111B.

[0076] The present invention adds an air guide cover 1160 to the base 1130, and can use the air guide cover 1160 to isolate the fan 1200 and the air outlet 111B. Therefore, the gas exhausted by the fan 1200 must also fully flow and circulate in the entire base area 1140 before being discharged out through the air outlet 111B on the second air flow cavity 1152, thereby taking away more water vapor. At the same time, the first air hole 113A and the second air hole 113B are both arranged in the first air flow cavity 1151, the air outlet hole 111B is arranged in the second air flow cavity 1152, and the air inlet hole 111A and the air outlet hole 111B are arranged on opposite sides of the base 1130, so that the wind blown out by the fan 1200 can enter the receiving groove 1141 after passing through the heating element 1300 in the first air flow cavity 1151, and then flow back to the second air flow cavity 1152 through the holes or gaps on the base 1130, and then be discharged through the air outlet hole 111B. In this way, the residence time of the hot air flow in the receiving groove 1141 can be extended, which is beneficial to drying out the water vapor in the wire and increasing the temperature in the air flow cavity, avoiding or reducing the situation where the external gas enters the silo through the air flow opening 1161 and then is directly discharged from the silo through the air outlet hole 111B, thereby improving the effectiveness of the air flow circulation.

[0077] In one implementation, please refer to Figure 6 and Figure 7 , the air guide cover 1160 is connected with a guide plate 1170, the guide plate 1170 is contained in the first air flow cavity 1151, the air outlet of the fan 1200 faces the guide plate 1170, the heating element 1300 is located between the first air hole 113A and the second air hole 113B, and the projection of the axis of the heating element 1300 and the tray 2000 on the bottom wall of the housing 1120 overlaps. Specifically, the guide plate 1170 and the fan 1200 are located at opposite ends of the air guide cover 1160, and the heating element 1300 is located between the two. Therefore, the air blown out by the fan 1200 can first pass through the heating element 1300 and the guide plate 1170, and then return to the base area 1140 through the second air hole, thereby completing the internal circulation of the airflow. The airflow formed by the first air hole 113A and the second air hole 113B bypasses the upper arc of the material tray to form an airflow circulation. The heating element 1300 is arranged between the first air hole 113A and the second air hole 113B. The heat of the heating element 1300 can be scattered and heated by the base 1130, and can also improve the drying and heating effect of the area that the airflow cannot cover on the material tray, so that the wire of the material tray can be evenly dried.

[0078] In one implementation, please refer to Figure 6 and Figure 7The air guide cover 1160 extends in an L shape, and the air guide cover 1160 includes an intersecting first extension portion 1162 and a second extension portion 1163, the space in the first extension portion 1162 is connected to the space in the second extension portion 1163, the fan 1200 and the heating element 1300 are located in the first extension portion 1162, the guide plate 1170 is located in the second extension portion 1163, and the guide plate 1170 extends in an S shape in the second extension portion 1163.

[0079] The present invention arranges the air guide cover 1160 in an L-shape so that there is a shorter air flow path in the air guide cover 1160, and the L-shaped air guide cover 1160 can cooperate with the arrangement of the air inlet hole 111A and the air outlet hole 111B arranged on opposite sides of the base 1130, so that the wind blown out by the fan 1200 can enter the receiving groove 1141 after passing through the heating element 1300 in the first air flow cavity 1151, and then flow back to the second air flow cavity 1152 through the hole or gap on the base 1130; further, the present invention also arranges the guide plate 1170 in an S-shape to increase the extension length of the guide plate 1170, thereby providing a better air guide effect.

[0080] In one implementation, please refer to Figure 8 The shell 1120 includes a shell side plate and a shell bottom plate connected to each other. The shell side plate is annular and surrounds the outer periphery of the base 1130. The shell bottom plate is the bottom wall of the shell in the above embodiment. The shell side plate includes a first side plate 1111, a third side plate 1113, a second side plate 1112 and a fourth side plate 1114 which are connected in a ring shape in sequence. The air inlet 111A is close to the first side plate 1111 and the third side plate 1113, and the air outlet 111B is opened on the fourth side plate 1114 or opened on the second side plate 1112 and is arranged close to the fourth side plate 1114. Specifically, the appearance contour shape of the shell 1120 can be a rectangular parallelepiped, and the bottom wall of the shell 1120 corresponds to the opening of the shell 1120 in the above embodiment. The four side plates of the shell 1120 are connected at the end. The first side plate 1111 and the second side plate 1112 are opposite, and the third side plate 1113 and the fourth side plate 1114 are opposite. The air inlet 111A is close to the angle where the first side plate 1111 and the third side plate 1113 are connected, and the air outlet 111B is on the second side plate 1112 and close to the fourth side plate 1114 .

[0081] In one embodiment, the air inlet 111A is close to the first side panel 1111 and the fourth side panel 1114, and the air outlet 111B is opened on the third side panel 1113 or opened on the second side panel 1112 and arranged close to the third side panel 1113; so that the air inlet 111A and the air outlet 111B are arranged along the diagonal of the outer shell.

[0082] In other embodiments, the air inlet 111A and the air outlet 111B are both located on the bottom wall, and the air inlet 111A is located on the bottom wall and close to the angle formed by the first side plate 1111 and the fourth side plate 1114, and the air outlet 111B is located on the bottom wall and close to the angle formed by the second side plate 1112 and the third side plate 1113. In this way, the air inlet 111A and the air outlet 111B are arranged along the diagonal line of the bottom wall.

[0083] In other embodiments, the air inlet 111A and the air outlet 111B are both located on the shell side panels, and the air inlet 111A is located on the first side panel 1111 and is disposed close to the fourth side panel 1114, or is located on the fourth side panel 1114 and is disposed close to the first side panel 1111; the air outlet 111B is located on the third side panel 1113 and is disposed close to the second side panel 1112, or is located on the second side panel 1112 and is disposed close to the third side panel 1113. In this way, the orthographic projections of the air inlet 111A and the air outlet 111B on the bottom wall are arranged diagonally.

[0084] The present invention arranges the air inlet 111A and the air outlet 111B at the diagonal positions on the outer shell 1120 respectively, thereby improving the air flow path after the air is discharged by the fan 1200, so that the air flow can fully flow in the silo 1000 and can form a circulation in coordination with the positions of the first air hole 113A and the second air hole 113B; at the same time, the air inlet 111A and the air outlet 111B are farther away, which can reduce the air flow interference or air flow short-circuit problem at the two air ports, and use the fan 1200 to draw as much external dry gas as possible into the silo 1000.

[0085] In one embodiment, the fan 1200 is provided with a first air inlet near the fan blade side, the first air inlet faces the bottom wall of the housing 1120 and corresponds to the air inlet hole 111A. Further, the fan 1200 includes a first air inlet and a second air inlet arranged opposite to each other, the first air inlet faces the bottom wall of the housing 1120 and is connected to the air inlet hole 111A, and the second air inlet faces the bottom wall of the base 1130 and is connected to the first air hole 113A. Specifically, the fan 1200 is a double-sided centrifugal fan 1200, which not only has a larger air intake volume, but also has better air intake efficiency and stability. Therefore, in order to make full use of the double-sided air intake feature of the fan 1200, the first air inlet is directed toward the bottom wall of the housing 1120 and connected to the air inlet hole 111A, so that the first air inlet is used to draw air from the outside; the second air inlet is directed toward the bottom wall of the base 1130 and connected to the first air hole 113A, so that the second air inlet is used to draw air from the base area 1140. Preferably, the first air inlet is close to the fan blade side of the fan 1200.

[0086] In one implementation, please refer to Figure 8, the number of the air inlet hole 111A on the bottom wall of the housing 1120 is one, and the air inlet hole 111A is close to one of the two first air hole groups 1131. Of course, in other embodiments, the number of the air inlet holes 111A on the bottom wall of the housing 1120 may be two, and the two air inlet holes 111A correspond to two fans 1200 respectively.

[0087] In one implementation, please refer to Figure 8 , on the second side plate 1112, the straight-line distance L2 from the air inlet 111A to the second side plate 1112 is 155 mm to 220 mm. Alternatively, the straight-line distance L3 projected on the bottom wall of the housing 1120 between the air inlet 111A and the air outlet 111B is 270 mm to 450 mm. Optionally, the straight-line distance L2 can be 155 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, 210 mm, 220 mm. Optionally, the straight-line distance L3 can be 270 mm, 300 mm, 330 mm, 360 mm, 390 mm, 420 mm, 450 mm.

[0088] The present invention can expand the area through which the gas flows after the fan 1200 discharges air by arranging the oblique distance between the air outlet of the fan 1200 and the air outlet hole 111B, so that the gas in the silo 1000 is mobilized and circulated, avoiding the local accumulation of humid gas and affecting the dryness inside the silo 1000.

[0089] In one embodiment, there are two fans, both of which include a motor side and a blade side, and an air inlet is correspondingly designed on the motor side and the fan side, that is, the motor side and the blade side of the fan are both used for air intake, and the air intake on the blade side is greater than the air intake on the motor side. Further, the blade side of one of the fans faces the air inlet 111A, and the blade side of the other fan faces the first air hole 113A. Among them, only one air inlet is provided on the bottom plate of the housing, and the fan corresponding to the air inlet 111A has its blade side facing the air inlet 111A, and the air inlet 111A is arranged diagonally with the air outlet 111B, and the other fan that does not correspond to the air inlet 111A has its blade side facing the first air hole 113A. The two sets of fans are arranged in this way, so that one of the fans can draw more air from the base area 1140, and the other can draw more air from the outside of the silo, thereby fully utilizing the efficiency of the fans, making the airflow circulation of the entire silo more uniform, and avoiding the local accumulation of humid gas and affecting the dryness inside the silo 1000.

[0090] In one implementation, please refer to Figure 8The silo 1000 further includes an air valve 1400, which is disposed at the air inlet 111A and / or the air outlet 111B. The air valve 1400 is used to control the opening or closing of the air inlet 111A and / or the air outlet 111B. Specifically, there are two air valves 1400, one of which is installed at the air inlet 111A and the other is installed at the air outlet 111B. In this way, the gas in the silo 1000 forms an internal circulation flow or an external circulation flow by opening or closing the air valve 1400.

[0091] In one implementation, please refer to Fig. 9 When the base 1130 includes two groups of support shafts 1133 spaced apart, one group of support shafts 1133 is detachably connected to the body of the base 1130, and after the support shafts 1133 are detached, the airflow chamber 1150 is exposed through the gap after the detachment. The gap exposed after the support shafts 1133 are detached can be used for placing the desiccant pack 3000. Optionally, the support shaft 1133 on the side away from the fan 1200 is detachably connected to the body of the base 1130.

[0092] In one implementation, please refer to Fig. 9 The air guide cover 1160 also separates the airflow chamber 1150 to form a drying groove 1153, which is used to accommodate the desiccant pack 3000. Therefore, after the support shaft 1133 is disassembled, the drying groove 1153 is exposed through the disassembled gap, the drying groove 1153 is connected to the first airflow chamber 1151, and the drying groove 1153 is located on the side of the heating element 1300 facing away from the fan 1200. In this way, the desiccant pack 3000 that has absorbed water can be reactivated by the heat flow in the first airflow chamber 1151.

[0093] In one embodiment, after the support shaft 1133 is disassembled, the first airflow chamber 1151 is exposed through the gap after disassembly, that is, the desiccant bag 3000 can be directly placed in the first airflow chamber 1151, and the desiccant bag 3000 is located on the side of the heating element 1300 in the first airflow chamber 1151 facing away from the fan 1200. In this way, the desiccant bag 3000 can be reactivated by the heat flow in the first airflow chamber 1151 after absorbing water.

[0094] It should be noted that the air guide cover can enclose the drying slot 1153 for placing the desiccant pack 3000 alone, or the desiccant pack 3000 can be placed directly in the first airflow chamber 1151; the purpose of the above two embodiments is to quickly replace the desiccant pack 3000 through the detachable support shaft 1133, and the desiccant pack 3000 is also in the heat flow path formed by the fan 1200 and the heating element 1300, so as to reactivate the desiccant pack 3000 and avoid repeated replacement of the desiccant pack 3000, so as to achieve the purpose of solving costs and improving efficiency. In one embodiment, please refer to Fig. 9In the height direction of the silo 1000, the second air hole 113B is located obliquely above the desiccant bag 3000, and compared with the desiccant bag 3000, the second air hole 113B is closer to the heat flow path formed by the fan 1200 and the heating element 1300. In this way, the heat flow formed by the fan 1200 and the heating element 1300 can flow out from the second air hole 113B first, and the desiccant bag 3000 can be fully dried when the heat flow with sufficient pressure is formed at the second air hole 113B. Therefore, the setting position of the desiccant bag 3000 will not affect the air output of the second air hole 113B, and it can also ensure that the heat flow near the second air hole 113B can fully dry the desiccant bag 3000.

[0095] In one embodiment, the present invention further provides a 3D printing feeding device, which includes a material tray 2000 and the material bin 1000 in the above-mentioned embodiments, and the receiving groove 1141 is used to receive the material tray 2000, and the material tray 2000 is used to carry materials.

[0096] In one embodiment, the present invention further provides a 3D printing device, which includes a 3D printer and the 3D printing feeding device provided in the above embodiment.

[0097] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship of the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0098] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A silo for a 3D printing feeding device, characterized in that: include: shell; A base, which is accommodated in the shell, has a base area on the base, the base includes a support shaft for supporting a material tray, the area below a plane passing through the axis of the support shaft and parallel to the bottom wall of the shell is the base area, the material tray is placed in the base area, an air flow cavity is provided between the base and the bottom wall of the shell, the base is provided with a first air hole and a second air hole, the first air hole and the second air hole are spaced apart in the circumferential direction of the material tray, and the first air hole and the second air hole are connected to the base area and the air flow cavity respectively; The fan and the heating element are accommodated in the airflow cavity. The fan is arranged adjacent to the first air hole, and the air outlet of the fan faces one side of the second air hole.

2. The silo according to claim 1, characterized in that: The shape of the bottom wall of at least a part of the base area is adapted to the outer contour of the material tray. Along the circumferential direction of the material tray, the length L1 of the arc formed by the line connecting the first air hole and the second air hole is 90 mm to 180 mm.

3. The silo according to claim 1, characterized in that: A first pore group and a second pore group are provided on the base, the first pore group includes a plurality of the first pores, and the second pore group includes a plurality of the second pores; the plurality of the first pores are arranged in an array, and the second pores are arranged in an array; the number of the first pore groups is multiple, and the number of the second pore groups is multiple, and along the axial direction of the material tray, the plurality of the first pore groups are arranged in sequence at intervals, and the plurality of the second pore groups are arranged in sequence at intervals.

4. The silo according to claim 1, characterized in that: The base area is divided into a plurality of receiving grooves, any one of the receiving grooves is used to receive a portion of the material tray, the number of the fans is multiple, and at least one of the fans exchanges gas with two of the receiving grooves through the first air holes.

5. The silo according to claim 1, characterized in that: The bottom wall and / or side panel of the shell are provided with air inlet holes, the air inlet of the fan is inclined relative to the bottom wall of the shell, and the inclination angle α formed by the air inlet surface where the air inlet of the fan is located and the bottom wall of the shell is 12° to 30°.

6. The silo according to claim 5, characterized in that: The fan has at least one air inlet, one of which faces the bottom wall of the shell, and the orthographic projection of the air inlet on the bottom wall of the shell at least partially overlaps with the air inlet hole, or the distance between the air inlet and the air inlet hole is 10mm to 32mm.

7. The silo according to claim 6, characterized in that: The side panels and / or the bottom wall of the shell are provided with air outlet holes, the air outlet holes are connected to the air flow cavity, wherein the air outlet holes and the air inlet holes are respectively arranged on both sides of the projection of the axis of the material tray on the bottom wall of the shell.

8. The silo according to claim 6, characterized in that: The silo also includes an air guide hood, which is accommodated in the air flow cavity. The air guide hood is connected to the base, and the air guide hood divides the air flow cavity into a first air flow cavity and a second air flow cavity; the fan and the heating element are accommodated in the first air flow cavity, and the first air hole and the second air hole are connected to the base area and the first air flow cavity respectively; the fan has two air inlets, and the fan sucks the air flow of the first air hole through one of the air inlets and discharges it through the second air hole.

9. The silo according to claim 8, characterized in that: The air guide cover is connected to a guide plate, which is accommodated in the first air flow cavity. The air outlet of the fan faces the guide plate. The heating element is located between the first air hole and the second air hole, and the projection of the heating element and the axis of the material tray on the bottom wall of the outer shell overlaps.

10. The silo according to claim 9, characterized in that: The wind guide cover extends in an L shape, and includes a first extension portion and a second extension portion that intersect each other. The space in the first extension portion is connected to the space in the second extension portion. The fan and the heating element are located in the first extension portion, and the guide plate is located in the second extension portion. The guide plate extends in an S shape in the second extension portion.

11. The silo according to claim 7, characterized in that: The housing comprises a first side plate, a third side plate, a second side plate and a fourth side plate which are connected in sequence in a ring shape, the air inlet is close to the first side plate and the third side plate, and the air outlet is provided on the fourth side plate or is provided on the second side plate and close to the fourth side plate; or, The air inlet is close to the first side panel and the fourth side panel, and the air outlet is opened on the third side panel or opened on the second side panel and arranged close to the third side panel; so that the air inlet and the air outlet are arranged along the diagonal of the outer shell.

12. The silo according to claim 11, characterized in that A straight-line distance L2 from the air inlet to the second side plate is 155 mm to 220 mm.

13. The silo according to claim 11, characterized in that: The straight-line distance L3 from the air inlet to the air outlet is 270 mm to 450 mm.

14. The silo according to claim 7, characterized in that: The silo further includes an air valve, which is disposed at the air inlet and / or the air outlet, and is used to control the opening or closing of the air inlet and / or the air outlet.

15. The silo according to claim 5, characterized in that: There are two fans, and both fans include a motor side and a blade side. The blade side of one fan faces the air inlet, and the blade side of the other fan faces the first air hole.

16. The silo according to claim 1, characterized in that The base comprises two groups of support shafts arranged at intervals, wherein one group of support shafts is detachably connected to the body of the base, and the airflow cavity is exposed through a gap after the support shafts are disassembled, and the gap is used for placing a desiccant bag.

17. The silo according to claim 1, characterized in that The bottom wall of the base area is in an arc shape, and the first air hole and the second air hole are arranged on the arc-shaped bottom wall of the base area. In the height direction of the silo, there is a third distance between the first air hole and the edge of the material tray, there is a fourth distance between the second air hole and the edge of the material tray, and there is a fifth distance between the lowest point of the edge of the material tray and the base, wherein the third distance and the fourth distance are both greater than the fifth distance.

18. A 3D printing feeding device, characterized in that: The 3D printing feeding device includes a material tray and a material bin according to any one of claims 1 to 17, the receiving groove is used to receive the material tray, and the material tray is used to carry materials.

19. A 3D printing device, characterized in that: The 3D printing equipment includes a 3D printer and a 3D printing feeding device as described in claim 18.

Images