Material chamber, 3D printing material feeding apparatus and 3D printing device

Abstract

A material chamber (1000), a 3D printing feeding apparatus, and a 3D printing device. The material chamber (1000) comprises a housing (1120), a base (1130), a fan (1200), and a heating element (1300), the base (1130) being accommodated in the housing (1120). The base (1130) has a base region (1140), and the base (1130) comprises a support shaft (1133) for supporting a material spool (2000), a region below a plane that passes through an axis line of the support shaft (1133) and is parallel to a bottom wall of the housing (1120) being the base region (1140), and the material spool (2000) being placed in the base region (1140). An airflow chamber (1150) is formed between the base (1130) and the bottom wall of the housing (1120), the base (1130) being provided with a first air hole (113A) and a second air hole (113B), the first air hole (113A) and the second air hole (113B) being circumferentially spaced apart on the material spool (2000), and the first air hole (113A) and the second air hole (113B) being in communication with the base region (1140) and the airflow chamber (1150), respectively. The fan (1200) and the heating element (1300) are accommodated in the airflow chamber (1150), the fan (1200) being disposed adjacent to the first air hole (113A), and an air outlet of the fan (1200) facing toward a side of the second air hole (113B). The material chamber (1000) can solve the problem of poor drying effect of a material spool (2000) inside an existing 3D printing feeding apparatus.

Description

Material hopper, 3D printing feeding device and 3D printing equipment

[0001] This invention is based on PCT International Application No. PCT / CN2024 / 116181, filed on August 31, 2024, entitled "Hopper, 3D Printing Feeding Device and 3D Printing Equipment", and claims priority to the aforementioned PCT International Application. The entire contents of the aforementioned PCT International Application are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of 3D printing technology, specifically to a hopper, a 3D printing feeding device, and a 3D printing equipment. Background Technology

[0003] 3D printing equipment (also known as three-dimensional printers or stereo printers) constructs three-dimensional objects by printing layer by layer. A 3D printing device includes a print head for extruding printing material and a printing platform for depositing the printing material to form a three-dimensional object. The print head is configured to move relative to the printing platform, extruding printing material onto the surface of the printing platform as it moves. The printing material is 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 increasingly higher demands for the diversity of colors or materials used in 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 this 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 in existing 3D printing feeding devices.

[0006] To achieve the objectives of this invention, the following technical solution is provided:

[0007] In a first aspect, the present invention provides a hopper for a 3D printing feeding device, comprising a housing, a base, and a fan and heating element. The base is housed within the housing and has a base region. 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 housing is the base region. The material tray is placed in the base region. An airflow cavity is formed between the base and the bottom wall of the housing. The base has a first air hole and a second air hole, which are spaced apart circumferentially on the material tray. The first air hole and the second air hole respectively connect the base region and the airflow cavity. A fan and a heating element are housed in the airflow cavity. The fan is positioned 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 peripheral contour shape of the material tray, and the arc length L1 formed by the line connecting the first air hole and the second air hole along the circumferential direction of the material tray is 90mm to 180mm.

[0009] In one embodiment, the base is provided with a first air hole group and a second air hole group. The first air hole group includes a plurality of first air holes, and the second air hole group includes a plurality of second air holes. The plurality of first air holes are arranged in an array, and the plurality of second air holes are arranged in an array. There are a plurality of first air hole groups and a plurality of second air hole groups. Along the axial direction of the material tray, the plurality of first air hole groups are arranged at intervals, and the plurality of second air hole groups are arranged at intervals.

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

[0011] In one embodiment, an air inlet is provided on the bottom wall and / or side plate of the housing, and the air inlet of the fan is inclined relative to the bottom wall of the housing. The inclination angle α formed by the air inlet surface of the fan and the bottom wall of the housing is 12° to 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 coincides 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 outlets are provided on the side panels and / or bottom wall of the outer casing, and the air outlets are connected to the airflow cavity.

[0014] In one embodiment, the hopper further includes an air guide hood, which is housed in the airflow cavity and connected to the base. The air guide hood separates the airflow cavity to form a first airflow cavity and a second airflow cavity. The fan and the heating element are housed in the first airflow cavity. The first air vent and the second air vent are respectively connected to the base area and the first airflow cavity. The fan has two air inlets, and the fan draws in the airflow from the first air vent through one of the air inlets and discharges it through the second air vent.

[0015] In one embodiment, a guide plate is connected to the air guide shroud, the guide plate is housed in the first airflow 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 heating element overlaps with the projection of the axis of the material tray on the bottom wall of the outer shell.

[0016] In one embodiment, the air guide shroud extends in an L-shape and includes an intersecting first extension and a second extension. The space within the first extension is connected to the space within the second extension. The fan and the heating element are located in the first extension, and the guide plate is located in the second extension, extending in an S-shape within the second extension.

[0017] In one embodiment, the outer casing includes a first side plate, a third side plate, a second side plate, and a fourth side plate connected in a ring in sequence. The air inlet is close to the first side plate and the third side plate, and the air outlet is opened on the fourth side plate or opened on the second side plate and disposed close to the fourth side plate.

[0018] In one embodiment, the air inlet is located near the first side plate and the fourth side plate, and the air outlet is located on the third side plate or on the second side plate and located near the third side plate, so that the air inlet and the air outlet are arranged along the diagonal of the housing.

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

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

[0021] In one embodiment, the silo further includes an air valve, which is provided at the air inlet and / or the air outlet, and is used to control the air inlet and / or the air outlet to be open or closed.

[0022] In one embodiment, the number of fans is two, and both fans include a motor side and a fan blade side, with the fan blade side of one fan facing the air inlet and the fan blade side of the other fan facing the first air inlet.

[0023] In one embodiment, the base includes two sets of spaced-apart support shafts, one set of which is detachably connected to the body of the base. The airflow cavity is exposed through a notch after the support shafts are detached, and the notch is used to insert a desiccant pack.

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

[0025] Secondly, the present invention also provides a 3D printing feeding device, the 3D printing feeding device including a material tray and a material hopper as described in the above embodiments, the receiving slot being used to receive the material tray, and the material tray being used to carry the material.

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

[0027] This invention utilizes a base with first and second air holes arranged at intervals along the outer circumference of the tray, corresponding to different positions on the tray's outer perimeter. A fan is positioned near the first air hole. When the fan is activated, a negative pressure is created near it, causing gas in the base area to flow into the fan through the first air hole. Then, the fan's outlet faces the second air hole, creating a positive pressure there. Gas in the airflow chamber flows back into the base area through the second air hole, and the airflow forms a circumferential pattern along the outer perimeter of the tray, thus achieving efficient drying of the tray. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 is an exterior view of the silo according to one embodiment;

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

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

[0032] Figure 4 is a rear view of the base including the air guide shroud according to one embodiment;

[0033] Figure 5 is a rear view of the base according to one embodiment;

[0034] Figure 6 is an internal top view of the air guide cover according to one embodiment;

[0035] Figure 7 is an internal side view of the air guide cover according to one embodiment;

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

[0037] Figure 9 is a partial cross-sectional view of a silo according to one embodiment.

[0038] Explanation of reference numerals in the attached drawings: 1000 - hopper, 1100 - shell, 1110 - cover, 1120 - outer shell, 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 vent, 113B - second air vent, 1131 - first air vent group, 1132 - second air vent group, 1133 - support shaft, 1 140 - Base area, 1141 - Receiving slot, 1150 - Airflow chamber, 1151 - First airflow chamber, 1152 - Second airflow chamber, 1153 - Drying chamber, 1160 - Air guide hood, 1161 - Airflow opening, 1162 - First extension, 1163 - Second extension, 1170 - Guide plate, 1200 - Fan, 1300 - Heating element, 1400 - Air valve, 2000 - Material tray, 3000 - Desiccant pack. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] 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 it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0041] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0042] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] This invention provides a hopper for a 3D printing feeding device. The hopper stores material trays, and in a specific embodiment, the hopper can hold multiple material trays, and can output material from 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 linear material (hereinafter referred to as material) wound around the disc body. The material is wound around the disc body in turns. When material needs to be output, the hopper drives the disc to rotate, so that the rotation of the disc body causes the material to be released from the disc body.

[0044] In one embodiment, referring to Figures 1-3, the hopper 1000 includes a housing 1100, a fan 1200, and a heating element 1300. The fan 1200 and the heating element 1300 are housed within the housing 1100, and the fan 1200 is used to create an environment of internal and external airflow circulation within the housing 1100. The housing 1100 has a base region 1140 and an airflow cavity 1150, wherein the base region 1140 is used to house the tray 2000, and the airflow cavity 1150 is used to house the fan 1200. Gas exchange occurs between the base region 1140 and the airflow cavity 1150 via the fan 1200. In a specific embodiment, the fan 1200 can draw gas from a portion of the base area 1140 to other locations, thereby creating an internal airflow circulation. In other specific embodiments, the fan 1200 can draw external gas into the base area 1140, thereby creating an external airflow circulation. In dehumidification mode, this can remove humid air from the hopper to ensure a dry environment in the base area 1140. The heating element 1300 can be located at the air outlet of the fan 1200 and arranged in the path of the fan 1200's airflow, thereby using the heating element 1300 to dry the airflow blown out by the fan 1200.

[0045] In one embodiment, the housing 1100 includes a cover 1110, an outer shell 1120, and a base 1130. The outer shell 1120 encloses a cavity with an open end, and the base 1130 is installed into the cavity through the opening. The cover 1110 and the outer shell 1120 are movably connected and can be opened and closed; preferably, the cover 1110 and the outer shell 1120 are rotatably connected. The base 1130 separates the airflow cavity 1150 and the base region 1140.

[0046] In one embodiment, the shape of the cover 1110 is adapted to the shape of the tray 2000, the inner wall contour of the cover 1110 is the same as the outer peripheral contour of the tray 2000, and a partial gap is maintained between the inner wall of the cover 1110 and the tray 2000, and the gap is uniform, so that the cross-sectional area of ​​the airflow path formed between the cover 1110 and the tray 2000 is basically consistent, thereby obtaining a smoother airflow path, while reducing the gas in the hopper, facilitating sealing and keeping dry.

[0047] In one embodiment, the base 1130 is a one-piece molded structure, and its manufacturing method includes, but is not limited to, injection molding, compression molding, 3D printing, etc. It is understood that the base 1130 is a large, one-piece molded part, composed of horizontal / vertical ribs and partitions. Some of the horizontal / vertical ribs or partitions are connected to the inner wall of the outer shell 1120, and some of the horizontal / vertical ribs or partitions are interconnected. Therefore, the space in the base 1130 is obtained by dividing the cavities within the outer shell 1120 through these horizontal / vertical ribs or partitions.

[0048] In one embodiment, the base 1130 may also be integrally formed with the housing 1100, specifically, the base 1130 and the housing 1120 may be integrally formed. In this embodiment, the base region 1140 refers to the space of the base 1130 facing the cover 1110, and the tray 2000 is housed in the space enclosed by the base region 1140 and the cover 1110.

[0049] In one embodiment, the tray has a rotation axis, and a set of support shafts is provided at the axis. The area below the plane parallel to the bottom wall plane of the outer casing 1120 and passing through the support shafts is a base region 1140. In another embodiment, referring to Figures 2 and 3, an airflow cavity 1150 is provided between the base 1130 and the bottom wall of the outer casing 1120. The base region 1140 is formed between the base 1130 and the cover 1110, and the tray 2000 is placed on the base 1130. The base 1130 includes two sets of spaced-apart support shafts 1133, and the area between the two sets of support shafts 1133 is the base region 1140. The tray 2000 is placed in the base region 1140. Specifically, the area below the plane parallel to the bottom wall plane of the outer casing 1120 and passing through any set of support shafts is the base region 1140, or the area below the plane passing through the two sets of spaced-apart support shafts is the base region 1140.

[0050] Understandably, both the cover 1110 and the base 1130 have arcuate structures adapted to the tray 2000, thus allowing the cover 1110 and base 1130 to surround the tray 2000. The cover 1110 is opened to expose the opening in the outer casing 1120, through which the tray 2000 is placed in the base area 1140, and the tray 2000 rests on the base 1130. The cover 1110 is closed to enclose the base area 1140, and the tray 2000 discharges material through perforations in the outer casing 1120.

[0051] In one embodiment, referring to Figures 2 and 3, the housing 1100 has a first air hole 113A and a second air hole 113B. The first air hole 113A and the second air hole 113B are spaced apart in the circumferential direction of the material tray 2000. The first air hole 113A and the second air hole 113B are respectively connected to the base area 1140 and the airflow cavity 1150. 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-shaped 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 arranged at intervals in the circumferential direction of the material tray 2000. And along the height direction of the hopper 1000, the first air hole 113A and the second air hole 113B are both located in the base area 1140. By setting the first air hole 113A and the second air hole 113B below the support shaft 1133, the airflow can be drawn in and blown out by the fan from the bottom area of ​​the material tray 2000, so that the airflow path blown out by the fan 1200 can cover more area of ​​the material tray and improve the drying effect.

[0052] In one embodiment, referring to Figures 2 and 3, a blower 1200 is housed in an airflow cavity 1150 and positioned adjacent to a first air hole 113A, with the blower 1200's outlet facing the second air hole 113B. Specifically, the blower 1200 is located below the material tray 2000, i.e., the blower 1200 is mounted on the side of the base 1130 facing away from the material tray 2000. Because the blower 1200 is positioned adjacent to the first air hole 113A, a negative pressure is generated near the blower 1200 when it is started, causing gas in the base region 1140 to flow into the airflow cavity 1150 through the first air hole 113A. Simultaneously, the blower 1200's outlet faces the second air hole 113B, causing the blower 1200 to blow gas towards the second air hole 113B, allowing gas in the airflow cavity 1150 to flow back into the base region 1140 through the second air hole 113B.

[0053] In one embodiment, the material tray 2000 includes a tray body and linear material (hereinafter referred to as material) wound around the tray body. The material is wound in circles around the tray body. When material needs to be discharged, the hopper 1000 drives the material tray 2000 to rotate, so that the rotation of the tray body causes the material to be released from the tray body. The first air hole 113A and / or the second air hole 113B have a first distance between themselves and the material, and the first air hole 113A and / or the second air hole 113B have a second distance between themselves and the tray body. The first distance is greater than the second distance. This allows the airflow to circulate mainly through the area of ​​the material, avoiding air short-circuiting; and the larger space at the material area allows for a larger airflow, resulting in a better drying effect on the material. In one embodiment, referring to Figure 3, in the height direction of the hopper 1000, there is a third distance A1 between the first air hole 113A and the edge of the tray 2000, a fourth distance A2 between the second air hole 113B and the edge of the tray 2000, and a fifth distance A3 between the lowest point of the edge of the tray 2000 and the base 1130, wherein the third distance A1 and the fourth distance A2 are both greater than the fifth distance A3. It should be noted that the lowest point of the tray 2000 refers to the point on the tray 2000 closest to the bottom wall of the outer shell 1120 in the height direction of the hopper 1000. Since the tray 2000 is circular, when the tray 2000 is placed vertically, its outer perimeter (which is an arc shape) must have a lowest point. Optionally, the third distance A1 is greater than the fourth distance A2, i.e., A1 > A2 > A3. Since the dimensions at the third spacing A1 and the fourth spacing A2 are both relatively large, it indicates that the material tray 2000 is positioned higher at both locations. This arrangement allows the airflow to circulate mainly through the side of the material tray 2000 away from the base 1130, and the hot air inside the hopper 1000 will diffuse upwards instead of downwards, thus avoiding the problem of air short-circuiting.

[0054] It should be noted that the distance between the first vent 113A and the second vent 113B and the material tray 2000 is measured as follows: in a plane perpendicular to the axis of the material tray, along the height direction perpendicular to the bottom wall of the outer shell 1120, the distance between the shape center of the first vent 113A and the second vent 113B and the edge of the material tray is marked as a third spacing A1, a fourth spacing A2, and a fifth spacing A3. When the vents are in an array, the shape center of the array is selected as the measurement point.

[0055] This invention utilizes a first air hole 113A and a second air hole 113B on the housing 1100, arranged in a circumferential upward ring around 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. Simultaneously, a fan 1200 is positioned adjacent to the first air hole 113A. When the fan 1200 is activated, a negative pressure is created near the fan 1200, causing gas in the base region 1140 to flow into the fan 1200 through the first air hole 113A. Then, the air outlet of the fan 1200 faces the second air hole 113B, creating a positive pressure at the second air hole 113B. Gas in the airflow chamber 1150 flows back into the base region 1140 through the second air hole 113B, and the airflow forms a circumferential airflow along the outer periphery of the material tray 2000, thereby efficiently drying the material tray 2000.

[0056] In one embodiment, referring to Figure 2, at least a portion of the base region 1140 has an arc-shaped bottom wall to conform to the outer periphery of the tray 2000. The first air hole 113A and the second air hole 113B are disposed on the arc-shaped bottom wall of the base region 1140. This arrangement allows the first air hole 113A and the second air hole 113B to conform to the outer periphery of the tray 2000, thereby making the airflow path smoother. Along the circumferential direction of the tray 2000, the arc length L1 formed by the line connecting the first air hole 113A and the second air hole 113B is 90mm to 180mm. Specifically, the circumferential distance between the first air hole 113A and the second air hole 113B refers to the length of the arc formed along the circumferential direction between the nearest point of the first air hole 113A to the second air hole 113B and the nearest point of the second air hole 113B to the first air hole 113A. Because the bottom wall of the base area 1140 is adapted to the outer periphery of the material tray 2000, the bottom wall of the base area 1140 will also be arc-shaped, hence the circumferential distance. Optionally, the arc length L1 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, or 180mm.

[0057] It should be noted that the line connecting the first vent 113A and the second vent 113B is measured as follows: the arc corresponding to the projection of the first vent 113A and the second vent 113B in a plane perpendicular to the axis of the support shaft. When the vents are in an array, the center of the array shape is selected as the measurement point.

[0058] The present invention sets the circumferential distance between the first vent 113A and the second vent 113B within the aforementioned range to ensure that the first vent 113A and the second vent 113B have a certain distance, thus avoiding interference between the airflow of the first vent 113A and the second vent 113B and the formation of turbulence. Furthermore, the aforementioned distance between the first vent 113A and the second vent 113B allows the air intake of the first vent 113A and the air exhaust of the second vent 113B to adapt to the material tray 2000 and form a circumferential airflow around the material tray 2000. The circumferential airflow can cover most of the area of ​​the material tray, thereby fully drying the material tray 2000 using the circumferential airflow.

[0059] In one embodiment, referring to FIG2, the housing 1100 has a first vent group 1131 and a second vent group 1132. The first vent group 1131 includes a plurality of first vents 113A, and the second vent group 1132 includes a plurality of second vents 113B. The plurality of first vents 113A are arranged in multiple rows and / or columns, and the second vents 113B are arranged in multiple rows and / or columns. Specifically, the first vent group 1131 includes a plurality of first vents 113A arranged in multiple rows and / or columns, thus the position of the first vent group 1131 forms a mesh-like structure; the first vent group 1131 includes a plurality of second vents 113B arranged in multiple rows and / or columns, thus the position of the second vent group 1132 forms a mesh-like 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.

[0060] In one embodiment, the pores of the first pore group 1131 and / or the second pore group 1132 are circular in shape. The first pore 113A located on the outer layer of the first pore group 1131 has a first pore diameter, and the first pore 113A located in the middle of the first pore group 1131 has a second pore diameter, wherein the first pore diameter is smaller than the second pore diameter. The second pore 113B located on the outer layer of the second pore group 1132 has a third pore diameter, and the second pore 113B located in the middle of the second pore group 1132 has a fourth pore diameter, wherein the third pore diameter is smaller than the fourth pore diameter.

[0061] The present invention, by setting a first pore group 1131 and a second pore group 1132 with a mesh-like structure, enables the first pore group 1131 and the second pore group 1132 to have the effect of a screen, which can block impurities in the base area 1140 and the airflow cavity 1150 from moving with the airflow, and prevent impurities and dust from affecting the material tray 2000 or components inside the hopper 1000; at the same time, the pore group with the mesh-like structure also disperses the impact force of the airflow and stabilizes the airflow, reducing the turbulence caused by the airflow dispersion at the first pore 113A and the second pore 113B.

[0062] In one embodiment, referring to Figure 2, there are multiple first air hole groups 1131 and multiple second air hole groups 1132. Along the axial direction of the material tray 2000, the multiple first air hole groups 1131 are arranged at intervals, and the multiple second air hole groups 1132 are arranged at intervals. Specifically, there can be multiple first air hole groups 1131, and these groups are arranged at intervals along the axial direction of the material tray 2000. Each first air hole group 1131 includes multiple first air holes 113A. Similarly, there can be multiple second air hole groups 1132, and these groups are arranged at intervals along the axial direction of the material tray 2000. Each second air hole group 1132 includes multiple second air holes 113B.

[0063] The present invention provides multiple sets of first pore groups 1131 and second pore groups 1132, which can be used for multiple trays 2000 in the corresponding base area 1140. Furthermore, the pore groups arranged along the axial direction can increase the airflow density near the trays 2000, so that each tray 2000 can be fully dried.

[0064] In one embodiment, referring to Figure 2, the base area 1140 is divided into multiple receiving slots 1141. Each receiving slot 1141 is used to receive a portion of a tray 2000. There are multiple fans 1200, and at least one fan 1200 exchanges gas with two of the receiving slots 1141 through a first air vent 113A. Specifically, at least one partition plate is provided on the bottom wall of the base area 1140, dividing the base area 1140 into receiving slots 1141. Each receiving slot 1141 is used to independently receive a portion of a tray 2000. There are also multiple fans 1200. The number of fans 1200 can be the same as the number of receiving slots 1141, and they can correspondingly supply air to the receiving slots 1141. Alternatively, the number of fans 1200 can 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.

[0065] This invention, by setting multiple fans 1200 corresponding to multiple material trays 2000, can be distinguished from the single fan 1200 solution in the prior art. Increasing the number of fans 1200 improves the airflow drying effect in the material silo 1000; and the airflow density around the material tray 2000 corresponding to the fan 1200 is increased, which improves the drying effect of a single material tray 2000.

[0066] In one embodiment, referring to Figure 2, the hopper 1000 is used to accommodate four trays 2000. The base 1130 is divided into four receiving slots 1141 for accommodating the four hoppers 1000, arranged sequentially along the axial direction of the trays 2000. There are two first air vent groups 1131 and four second air vent groups 1132. Along the axial direction of the trays 2000, the two first air vent groups 1131 are respectively located on the bottom walls of the two outermost receiving slots 1141, meaning the two first air vent groups 1131 are respectively positioned on the two outermost trays 2000. Along the axial direction of the trays 2000, the four second air vent groups 1132 are independently located on the bottom walls of the four receiving slots 1141, meaning the four first air vent groups 1131 are respectively positioned on the four trays 2000. There are two fans 1200, each independently corresponding to one of the two first air vent groups 1131.

[0067] In one embodiment, referring to Figure 8, an air inlet 111A is provided on the bottom wall and / or side plate of the outer casing 1120, and an air outlet 111B is provided on the side plate and / or bottom wall of the outer casing 1120. The air outlet 111B communicates with the airflow cavity 1150. The air outlet 111B and the air inlet 111A are respectively located on both sides of the projection of the axis of the material tray 2000 onto the bottom wall of the outer casing 1120. Specifically, the blower 1200 draws external gas into the hopper 1000 through the air inlet 111A on the bottom wall of the outer casing 1120, and discharges the gas in the hopper 1000 through the air outlet 111B on the side plate, thereby realizing external circulation.

[0068] By placing the air outlet 111B on one side of the airflow 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 airflow cavity 1150 through the holes or gaps on the base 1130, and is then discharged through the air outlet 111B. This can prolong the residence time of the hot airflow in the receiving groove 1141, which is beneficial for drying out the moisture in the wire and increasing the temperature in the airflow cavity.

[0069] In one embodiment, the air inlet of the fan 1200 is inclined relative to the bottom wall of the outer casing 1120, and the angle α formed by the air inlet surface of the fan 1200 and the bottom wall of the outer casing 1120 is 12° to 30°. Specifically, the fan 1200 is installed at an angle in the airflow cavity 1150. This is to adapt to the curved shape of the bottom wall of the base area 1140, and also to draw air from both inside and outside, utilizing the airflow in the airflow cavity 1150 to participate in internal circulation, thereby improving air intake efficiency and forming a circulating flow. Because the fan 1200 is installed at an angle, the second air inlet is close to the first air hole 113A, thereby creating a larger negative pressure at the first air hole 113A, thus increasing the air intake volume of the base area 1140. Optionally, the tilt angle α can be 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, or 30°.

[0070] In one embodiment, the fan 1200 has at least one air inlet, one of which faces the bottom wall of the housing 1120. The orthographic projection of the air inlet of the fan 1200 onto the bottom wall of the housing 1120 at least partially coincides with the air inlet hole 111A, or the distance between the air inlet and the air inlet hole 111A is 10mm to 32mm. Optionally, the distance between the air inlet and the air inlet hole 111A can be 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, or 32mm.

[0071] It should be noted that, in the above embodiments, the tilt angle α and the distance measurement positions between the air inlet and the air inlet hole 111A are both at the air inlet of the fan 1200 or the air inlet surface where the air inlet is located, and this air inlet is the air inlet of the fan 1200 on the side closer to (facing) the bottom wall of the outer casing 1120. Meanwhile, the measurement reference for the air inlet is the measurement point at the shape center of the air inlet and the air inlet hole 111A. The orthographic projection method in the above embodiments refers to the direction perpendicular to the bottom wall of the outer casing 1120.

[0072] This invention establishes an air inlet 111A on the bottom wall of the outer casing 1120 of the hopper 1000. When the blower 1200 is working, the blower 1200 creates a negative pressure at the air inlet 111A, drawing in air from outside the hopper 1000. Air from the outlet 111B, located away from the blower 1200, is pushed out through the outlet 111B, thus creating gas exchange between the inner and outer cavities. Furthermore, the air inlet position of the hopper 1000 is adapted to the air inlet of the blower 1200, reducing the airflow path from the air inlet 111A to the blower 1200, thereby improving the air intake efficiency of the blower 1200.

[0073] In one embodiment, referring to Figures 4-7, the hopper further includes an air guide shroud 1160, which is housed in an airflow cavity 1150. The air guide shroud 1160 is connected to the base 1130 and divides the airflow cavity 1150 to form a first airflow cavity 1151 and a second airflow cavity 1152. A fan 1200 and a heating element 1300 are housed in the first airflow cavity 1151. A first air hole 113A and a second air hole 113B are respectively connected to the base area 1140 and the first airflow cavity 1151. The fan 1200 has two air inlets. The fan 1200 draws in the airflow from the first air hole 113A through one of the air inlets and discharges it through the second air hole 113B.

[0074] In one embodiment, referring to Figures 4-7, the air guide shroud 1160 and the base 1130 are detachably connected. The air guide shroud 1160 is connected to the side of the base 1130 facing away from the material tray, i.e., housed within the airflow cavity 1150. The air guide shroud 1160 divides the airflow cavity 1150 into two regions: a first airflow cavity 1151 and a second airflow cavity 1152. The first airflow cavity 1151 is enclosed by the base 1130 and the air guide shroud 1160, while the second airflow cavity 1152 communicates with the external space through an air inlet 111A. An airflow opening 1161 is provided on the air guide shroud 1160, preferably with the air inlet of the fan 1200 opposite to the airflow opening 1161. Therefore, the blower 1200 can draw air from the second airflow chamber 1152 into the first airflow chamber 1151 through the airflow opening 1161. The gas blown out by the blower 1200 is located in the first airflow chamber 1151 and heated by the heater 1300 within it. It is understood that, except for the airflow opening 1161, the first airflow chamber 1151 and the second airflow chamber 1152 are separated by a guide shroud, thus eliminating any airflow path between them. In other words, in the external circulation airflow mode, external gas first flows into the second airflow chamber 1152 through the airflow opening 1161, is then drawn into the first airflow chamber 1151 by the blower 1200, enters the base area 1140 after heating, flows over the surface of the material tray, and then flows back into the second airflow chamber 1152 through holes or gaps in the base, and can be discharged from the hopper through the air outlet 111B.

[0075] By adding a wind guide shroud 1160 to the base 1130, the present invention can isolate the fan 1200 and the air outlet 111B. Therefore, the gas discharged by the fan 1200 must also flow and circulate fully within the entire base area 1140 before being discharged outward through the air outlet 111B on the second airflow chamber 1152, thereby carrying away more water vapor. Meanwhile, the first air hole 113A and the second air hole 113B are both located in the first airflow chamber 1151, and the air outlet 111B is located in the second airflow chamber 1152. The air inlet 111A and the air outlet 111B are located on opposite sides of the base 1130. This allows the air blown by the fan 1200 to enter the receiving tank 1141 after passing through the heating element 1300 in the first airflow chamber 1151, and then flow back to the second airflow chamber 1152 through the holes or gaps on the base 1130. Subsequently, it is discharged through the air outlet 111B. This can prolong the residence time of the hot airflow in the receiving tank 1141, which is beneficial for drying out the moisture in the wire and increasing the temperature in the airflow chamber. It avoids or reduces the situation where external gas enters the hopper through the airflow opening 1161 and is directly discharged from the hopper through the air outlet 111B, thereby improving the effectiveness of airflow circulation.

[0076] In one embodiment, referring to Figures 6 and 7, a guide plate 1170 is connected to the air guide shroud 1160. The guide plate 1170 is housed in the first airflow chamber 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 heating element 1300 and the axis of the material tray 2000 on the bottom wall of the outer casing 1120 overlaps. Specifically, the guide plate 1170 and the fan 1200 are located at opposite ends inside the air guide shroud 1160, and the heating element 1300 is located between them. 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, thus completing the internal airflow circulation. 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 disposed between the first air hole 113A and the second air hole 113B. The heat of the heating element 1300 can be diffused and heated by the base 1130, and can also improve the drying and heating effect of the area on the material tray that cannot be covered by the airflow. In this way, the material tray wire can be dried evenly.

[0077] In one embodiment, referring to Figures 6 and 7, the air guide shroud 1160 extends in an L-shape and includes an intersecting first extension 1162 and a second extension 1163. The space within the first extension 1162 is connected to the space within the second extension 1163. The fan 1200 and the heating element 1300 are located in the first extension 1162, and the guide plate 1170 is located in the second extension 1163. The guide plate 1170 extends in an S-shape in the second extension 1163.

[0078] The present invention provides an L-shaped air guide shroud 1160, which results in a shorter airflow path within the shroud 1160. The L-shaped shroud 1160 also allows for the arrangement of the air inlet 111A and air outlet 111B on opposite sides of the base 1130. This enables the air blown by the fan 1200 to pass through the heating element 1300 in the first airflow chamber 1151, enter the receiving groove 1141, and then flow back to the second airflow chamber 1152 through the holes or gaps in the base 1130. Furthermore, the present invention also provides an S-shaped guide plate 1170 to increase its extension length, thereby providing a better airflow guiding effect.

[0079] In one embodiment, referring to Figure 8, the outer shell 1120 includes connected side plates and a bottom plate. The side plates are annular and surround the outer periphery of the base 1130, and the bottom plate is the bottom wall of the outer shell in the above embodiment. The side plates include a first side plate 1111, a third side plate 1113, a second side plate 1112, and a fourth side plate 1114 connected in a ring. An air inlet 111A is located near the first side plate 1111 and the third side plate 1113, and an air outlet 111B is located on the fourth side plate 1114 or on the second side plate 1112 and located near the fourth side plate 1114. Specifically, the outer contour of the outer shell 1120 can be a cuboid. The bottom wall of the outer shell 1120 corresponds to the opening of the outer shell 1120 in the above embodiment, and the four side plates of the outer shell 1120 are connected end-to-end. The first side plate 1111 and the second side plate 1112 are opposite each other, and the third side plate 1113 and the fourth side plate 1114 are opposite each other. The air inlet 111A is located near the angle between the first side plate 1111 and the third side plate 1113, and the air outlet 111B is on the second side plate 1112 and near the fourth side plate 1114.

[0080] In one embodiment, the air inlet 111A is close to the first side plate 1111 and the fourth side plate 1114, and the air outlet 111B is opened on the third side plate 1113 or opened on the second side plate 1112 and disposed close to the third side plate 1113; so that the air inlet 111A and the air outlet 111B are arranged along the diagonal of the outer casing.

[0081] In other embodiments, both the air inlet 111A and the air outlet 111B are located on the bottom wall. 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, while 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. Thus, the air inlet 111A and the air outlet 111B are arranged diagonally along the bottom wall.

[0082] In other embodiments, both the air inlet 111A and the air outlet 111B are located on the side plates of the shell. The air inlet 111A is located on the first side plate 1111 and near the fourth side plate 1114, or on the fourth side plate 1114 and near the first side plate 1111. The air outlet 111B is located on the third side plate 1113 and near the second side plate 1112, or on the second side plate 1112 and near the third side plate 1113. Thus, the orthographic projections of the air inlet 111A and the air outlet 111B on the bottom wall are arranged diagonally.

[0083] This invention improves the airflow path after the blower 1200 exits by arranging the air inlet 111A and air outlet 111B diagonally on the outer casing 1120, allowing the airflow to flow fully in the hopper 1000 and form a circulation with the positions of the first air outlet 113A and the second air outlet 113B. At the same time, the distance between the air inlet 111A and the air outlet 111B reduces airflow interference or short-circuiting at the two air outlets, allowing the blower 1200 to draw as much external dry gas as possible into the hopper 1000.

[0084] In one embodiment, the fan 1200 has a first air inlet near the fan blade side, the first air inlet facing the bottom wall of the housing 1120 and corresponding to the air inlet hole 111A. Further, the fan 1200 includes a first air inlet and a second air inlet disposed opposite to each other. The first air inlet faces the bottom wall of the housing 1120 and connects to the air inlet hole 111A, and the second air inlet faces the bottom wall of the base 1130 and connects to the first air hole 113A. Specifically, the fan 1200 is a double-sided air-inlet centrifugal fan 1200, which not only has a larger air intake volume but also better air intake efficiency and stability. Therefore, in order to fully utilize the double-sided air intake feature of the fan 1200, the first air intake is oriented towards the bottom wall of the outer casing 1120 and connected to the air intake hole 111A, thereby drawing air from the outside using the first air intake; the second air intake is oriented towards the bottom wall of the base 1130 and connected to the first air hole 113A, thereby drawing air from the base area 1140 using the second air intake. Preferably, the first air intake is located near the fan blade side of the fan 1200.

[0085] In one embodiment, referring to Figure 8, the number of air inlets 111A on the bottom wall of the housing 1120 is one, and the air inlet 111A is close to one of the two first air vent groups 1131. Of course, in other embodiments, the number of air inlets 111A on the bottom wall of the housing 1120 can be two, and the two air inlets 111A correspond to two fans 1200 respectively.

[0086] In one embodiment, referring to Figure 8, the straight-line distance L2 from the air inlet 111A to the second side plate 1112 is 155mm to 220mm. Alternatively, the straight-line distance L3 between the projections of the air inlet 111A and the air outlet 111B onto the bottom wall of the housing 1120 is 270mm to 450mm. Optionally, the straight-line distance L2 can be 155mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, or 220mm. Optionally, the straight-line distance L3 can be 270mm, 300mm, 330mm, 360mm, 390mm, 420mm, or 450mm.

[0087] The present invention expands the flow area of ​​the gas after the fan 1200 is discharged by arranging the oblique distance between the air outlet and the air outlet hole 111B of the fan 1200, thereby mobilizing the gas in the silo 1000 to circulate and avoid the accumulation of humid gas in a local area, which would affect the dryness of the silo 1000.

[0088] In one embodiment, there are two fans, each including a motor side and a fan blade side. Each fan side has a corresponding air inlet, meaning both the motor side and the fan blade side are used for air intake, with the fan blade side having a larger air intake volume than the motor side. Furthermore, the fan blade side of one fan faces the air inlet 111A, while the fan blade side of the other fan faces the first air outlet 113A. The bottom plate of the casing has only one air inlet. The fan corresponding to air inlet 111A has its fan blade side facing air inlet 111A. Air inlet 111A and air outlet 111B are arranged diagonally. The other fan, not corresponding to air inlet 111A, has its fan blade side facing the first air outlet 113A. By arranging the two sets of fans in this way, one fan can draw more air from the base area 1140, and the other can draw more air from outside the silo. This fully utilizes the efficiency of the fans, making the airflow circulation of the entire silo more uniform and preventing the accumulation of humid gas in local areas from affecting the dryness of the silo 1000.

[0089] In one embodiment, referring to Figure 8, the silo 1000 further includes an air valve 1400. The air valve 1400 is installed at the air inlet 111A and / or the air outlet 111B, and 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 installed at the air inlet 111A and the other installed at the air outlet 111B. Thus, by opening or closing the air valve 1400, the gas within the silo 1000 can form an internal or external circulation flow.

[0090] In one embodiment, referring to Figure 9, when the base 1130 includes two sets of spaced-apart support shafts 1133, one set of support shafts 1133 is detachably connected to the body of the base 1130. After the support shafts 1133 are disassembled, the airflow cavity 1150 is exposed through the disassembled notch. The notch exposed after the support shafts 1133 are disassembled can be used to insert 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.

[0091] In one embodiment, referring to Figure 9, the air guide shroud 1160 further divides the airflow cavity 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 notch, and the drying groove 1153 communicates with the first airflow cavity 1151. The drying groove 1153 is located on the side of the heating element 1300 facing away from the fan 1200. This allows the desiccant pack 3000, after absorbing water, to be reactivated by the heat flow in the first airflow cavity 1151.

[0092] In one embodiment, after the support shaft 1133 is disassembled, the first airflow cavity 1151 is exposed through the disassembled notch, meaning the desiccant pack 3000 can be directly placed into the first airflow cavity 1151, and the desiccant pack 3000 is located on the side of the heating element 1300 in the first airflow cavity 1151 facing away from the fan 1200. This allows the desiccant pack 3000, after absorbing water, to be reactivated by the heat flow in the first airflow cavity 1151.

[0093] It should be noted that the air guide shroud can either enclose the drying trough 1153 for separate placement of the desiccant pack 3000, or the desiccant pack 3000 can be placed directly into the first airflow chamber 1151. The purpose of both embodiments is to allow for quick replacement of the desiccant pack 3000 via the detachable support shaft 1133, while ensuring the desiccant pack 3000 remains on the heat flow path formed by the fan 1200 and the heating element 1300. This reactivates the desiccant pack 3000, avoiding repeated replacements and thus reducing costs and improving efficiency. In one embodiment, referring to Figure 9, in the height direction of the hopper 1000, the second vent 113B is located diagonally above the desiccant pack 3000, and is closer to the heat flow path formed by the fan 1200 and the heating element 1300 than the desiccant pack 3000. This allows the heat flow generated by the fan 1200 and the heating element 1300 to preferentially flow out from the second vent 113B, and the desiccant pack 3000 to be fully dried when the heat flow at the second vent 113B is sufficiently pressurized. Therefore, the placement of the desiccant pack 3000 will not affect the air output of the second vent 113B, and can also ensure that the heat flow near the second vent 113B can fully dry the desiccant pack 3000.

[0094] In one embodiment, the present invention also provides a 3D printing feeding device, which includes a material tray 2000 and a material hopper 1000 as described in the above embodiments. A receiving slot 1141 is used to receive the material tray 2000, and the material tray 2000 is used to carry the material.

[0095] In one embodiment, the present invention also provides a 3D printing device, which includes a 3D printer and a 3D printing feeding device provided in the above embodiment.

[0096] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship of the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0097] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A hopper for a 3D printing feeding device, characterized in that, include: shell; A base is housed within the outer casing. The base has a base area and includes a support shaft for supporting a tray. The area below a plane passing through the axis of the support shaft and parallel to the bottom wall of the outer casing is the base area. The tray is placed in the base area. An airflow cavity is provided between the base and the bottom wall of the outer casing. The base has 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 tray. The first air hole and the second air hole are respectively connected to the base area and the airflow cavity. A fan and a heating element are housed in the airflow cavity. The fan is disposed adjacent to the first air hole, and the air outlet of the fan faces the second air hole.

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

3. The silo according to claim 1, characterized in that, The base is provided with a first air hole group and a second air hole group. The first air hole group includes a plurality of first air holes, and the second air hole group includes a plurality of second air holes. The plurality of first air holes are arranged in an array, and the plurality of second air holes are arranged in an array. There are a plurality of first air hole groups and a plurality of second air hole groups. Along the axial direction of the material tray, the plurality of first air hole groups are arranged at intervals, and the plurality of second air hole groups are arranged at intervals.

4. The silo according to claim 1, characterized in that, The base area is divided into multiple receiving slots, each of which is used to receive a portion of the material tray. There are multiple fans, and at least one fan exchanges gas with two of the receiving slots through the first air hole.

5. The silo according to claim 1, characterized in that, The bottom wall and / or side plate of the outer casing are provided with air inlets. The air inlet of the fan is inclined relative to the bottom wall of the outer casing. The inclination angle α formed by the air inlet surface of the fan and the bottom wall of the outer casing 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 housing, and the orthographic projection of the air inlet on the bottom wall of the housing at least partially coincides 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 plate and / or bottom wall of the outer shell are provided with air outlets, which are connected to the airflow cavity. The air outlets and the air inlets are respectively located on both sides of the projection of the axis of the material tray on the bottom wall of the outer shell.

8. The silo according to claim 6, characterized in that, The hopper also includes an air guide hood, which is housed in the airflow cavity and connected to the base. The air guide hood separates the airflow cavity to form a first airflow cavity and a second airflow cavity. The fan and the heating element are housed in the first airflow cavity. The first air vent and the second air vent are respectively connected to the base area and the first airflow cavity. The fan has two air inlets. The fan draws in the airflow from the first air vent through one of the air inlets and discharges it through the second air vent.

9. The silo according to claim 8, characterized in that, A guide plate is connected to the air guide shroud, and the guide plate is housed in the first airflow 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 heating element overlaps with the projection of the axis of the material tray on the bottom wall of the outer shell.

10. The silo according to claim 9, characterized in that, The air guide shroud extends in an L-shape and includes an intersecting first extension and a second extension. The space within the first extension is connected to the space within the second extension. The fan and the heating element are located in the first extension, and the guide plate is located in the second extension. The guide plate extends in an S-shape in the second extension.

11. The silo according to claim 7, characterized in that, The outer casing includes a first side plate, a third side plate, a second side plate, and a fourth side plate connected in a ring-like sequence. The air inlet is located near the first side plate and the third side plate, and the air outlet is located on the fourth side plate or on the second side plate and located near the fourth side plate; or, The air inlet is located near the first side plate and the fourth side plate, and the air outlet is located on the third side plate or on the second side plate and located near the third side plate, so that the air inlet and the air outlet are arranged along the diagonal of the outer casing.

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

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

14. The silo according to claim 7, characterized in that, The hopper also includes an air valve, which is provided at the air inlet and / or the air outlet. The air valve is used to control the air inlet and / or the air outlet to open or close.

15. The silo according to claim 5, characterized in that, The number of fans is two, and each fan includes a motor side and a fan blade side. The fan blade side of one fan faces the air inlet, and the fan blade side of the other fan faces the first air inlet.

16. The silo according to claim 1, characterized in that, The base includes two sets of spaced-apart support shafts, one set of which is detachably connected to the body of the base. The airflow cavity is exposed through a notch after the support shaft is detached, and the notch is used to insert a desiccant pack.

17. The silo according to claim 1, characterized in that, The bottom wall of the base area is arc-shaped. The first air hole and the second air hole are disposed on the arc-shaped bottom wall of the base area. In the height direction of the hopper, there is a third distance between the first air hole and the edge of the tray, a fourth distance between the second air hole and the edge of the tray, and a fifth distance between the lowest point of the tray edge and the base. 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 hopper according to any one of claims 1-17, wherein the receiving slot is used to receive the material tray and the material tray is used to carry the material.

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

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