Material laying device and additive manufacturing equipment using the same

Abstract

A material spreading device, comprising a material spreading bin, the material spreading bin is provided with a raw material inlet and a raw material outlet, a vibrating screen is further provided at the raw material outlet, the vibrating screen is bridged at the raw material outlet, and the raw material can fall after passing through the vibrating screen, so that the raw material has good fluidity and evacuation. By providing the vibrating screen at the raw material outlet of the material spreading bin, the falling raw material can have better fluidity and evacuation under the action of the vibrating screen, thereby ensuring the surface quality of the material spreading surface.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a material laying device for additive manufacturing equipment. Background Art

[0002] At present, when the sand mold 3D printer equipment for casting is printing a whole box, due to the different types of sand used in different products, different sand meshes and shapes, the gap under the sand scraper plate needs to be adjusted before printing, which will cause the problem of uneven sand placement. For example, if the amount of sand placed in some positions is large, problems such as pushing and pulling sand will occur, resulting in poor printing surface quality; on the other hand, the sand spreader has many parts and high operating accuracy requirements, which makes the sand spreader more frequently damaged during operation and the maintenance cost is high. Summary of the invention

[0003] In view of the above problems that the paving device needs to be frequently adjusted due to different particle sizes or mesh sizes of raw materials, and is difficult and expensive to maintain, it is necessary to propose a paving device for additive manufacturing equipment, which achieves uniform falling of raw materials by setting a vibrating screen at the discharge port.

[0004] A material spreading device comprises a material spreading bin, wherein the material spreading bin is provided with a raw material inlet and a raw material outlet, and a vibrating screen is also provided at the raw material outlet. The vibrating screen is bridged at the raw material outlet, and the raw material can fall after passing through the vibrating screen, so that the raw material has good fluidity and evacuability.

[0005] Furthermore, the vibrating screen includes a screen of a flat plate structure and a vibration source arranged on the screen. The screen of the flat plate structure is provided with a plurality of through holes, and the through holes are used for the passage of raw materials to achieve the purpose of evacuating the raw materials. The screen is connected to the side walls of the material paving bin on all sides with a certain buffer. The vibration source is arranged on the surface of the screen facing the inside of the material paving bin, and the vibration source is evenly distributed on the edge of the screen, that is, the vibration source is distributed on the edge where the screen borders the side wall of the material paving bin, and the vibration source provides vibration energy for the vibrating screen.

[0006] Furthermore, the vibrating screen includes a screen of a flat structure, a vibration source arranged on the screen, a support plate for supporting the screen, and a plurality of elastic members arranged between the screen and the support plate, the support plate is rigidly connected to the side wall of the paving bin, the screen is connected to the support plate through the plurality of elastic members, and the vibration source is arranged on the surface of the screen facing the inside of the paving bin; the elastic member can reduce the loss of vibration energy, that is, after the vibration source is triggered once, the vibration energy can be maintained for a longer time by the elastic member.

[0007] Furthermore, the elastic member is in a compressed state between the screen and the support plate, thereby facilitating the vibration of the screen.

[0008] Furthermore, in order to facilitate material dropping, a plurality of windows are provided on the support plate, and the raw materials can flow out of the material laying bin through the plurality of windows.

[0009] More preferably, in order to prevent the raw materials from leaking from the screen and the side wall of the material paving bin, a flexible connector, such as cloth, rubber, etc., is provided between the screen and the side wall of the material paving bin.

[0010] An additive manufacturing device includes the paving device. The paving device with the vibrating screen is suitable for paving raw materials with high viscosity, thereby ensuring the fluidity of the raw materials with high viscosity, that is, making the paving surface flat and meeting the requirements.

[0011] The beneficial effect of the technical solution of the present invention is that by arranging the vibrating screen at the raw material outlet of the paving bin, the falling raw materials can have better fluidity and evacuation under the action of the vibrating screen, thereby ensuring the surface quality of the paving surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of a material laying device for a 3D printing device;

[0013] Figure 2 yes Figure 1 A schematic longitudinal cross-sectional view of

[0014] Figure 3 yes Figure 1 A partial cross-sectional schematic diagram is used to illustrate the connection relationship of the vibrating screen in the material spreading device;

[0015] Figure 4 It is a schematic diagram of the vibration source arrangement, which is used to show the distribution of the vibration source on the vibrating screen;

[0016] Figure 5 It is a schematic diagram of the arrangement of elastic parts, which is used to show the distribution of elastic parts on the vibrating screen;

[0017] Among them, 201 is a storage hopper; 202 is a material discharge mechanism; 203 is a screen; 204 is a support plate; 205 is an elastic member; 206 is a side wall; 207 is a vibration source; 208 is a material paving bin; and 209 is a supporting plate. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solution of the present invention, the technical solution of the invention content is described in detail in conjunction with the accompanying drawings. Obviously, the following descriptions are some typical embodiments of the present invention. For ordinary technicians in this field, other solutions can be obtained based on these embodiments without paying creative work.

[0019] A material spreading device, comprising a material spreading bin 208, wherein the material spreading bin 208 is provided with a raw material inlet and a raw material outlet, and a vibrating screen is also provided at the raw material outlet. The vibrating screen is bridged at the raw material outlet, and the raw materials can fall after passing through the vibrating screen, so that the raw materials have good fluidity and evacuability.

[0020] Taking a sand mold 3D printing device as an example, the implementation of the technical solution of the present invention is described in detail.

[0021] Embodiment 1:

[0022] A material spreading device for 3D printing equipment includes a storage hopper 201, a material discharge mechanism 202 and the material spreading bin 208. The material discharge mechanism 202 is arranged in the storage hopper 201. The material discharge mechanism 202 is used to transport the raw materials from the storage hopper 201 to the material spreading bin 208 in a quantitative manner. The material spreading bin 208 is arranged below the discharge port of the storage hopper 201 to receive the raw materials from the storage hopper 201. The raw material inlet of the material spreading bin 208 is connected to or corresponds to the discharge port of the storage hopper 201. A vibrating screen is provided at the raw material outlet of the material spreading bin 208. The vibrating screen is connected across the raw material outlet of the material spreading bin 208 to vibrate and comb the falling raw materials. In this embodiment, when the vibrating screen is not vibrating, the raw materials remain on the vibrating screen; when the vibrating screen vibrates, a predetermined amount of raw materials falls according to the vibration energy of the vibrating screen. Figure 1 As shown, in this embodiment, the storage hopper 201 and the material spreading bin 208 are surrounded by a unified side wall 206, that is, the upper part of the space surrounded by the unified side wall 206 is the storage hopper 201, and the lower part is the material spreading bin 208.

[0023] In order to enable the material spreading bin 208 to well realize the material spreading operation of additive manufacturing, a material guide plate and a scraper plate are further provided at the raw material outlet of the material spreading bin 208. The material guide plate is arranged inside the raw material outlet of the material spreading bin 208, and one end of the material guide plate extends to the bottom of the vibrating screen, and the other end of the material guide plate extends to the inner edge of the raw material outlet of the material spreading bin 208, so as to facilitate the transportation of the raw materials to the work surface, thereby realizing material spreading; the scraper plate is arranged outside the raw material outlet of the material spreading bin 208, and the scraper plate is arranged at the outer edge of the raw material outlet of the material spreading bin 208, so as to facilitate the scraping and compaction of the raw materials that fall onto the work surface.

[0024] In order to achieve the vibration blanking effect of the vibrating screen, the vibrating screen has a flat plate structure of a screen 203 and a vibration source 207 arranged on the screen 203. The flat plate structure of the screen 203 is provided with a plurality of through holes, and the through holes are used for the passage of raw materials to achieve the purpose of evacuating the raw materials; there are a plurality of vibration sources 207, which are evenly distributed on the surface of the screen 203 facing the storage hopper 201, and the vibration source 207 is arranged at the edge of the screen 203; the screen 203 is connected to the side wall 206 of the material paving bin 208 through a rigid and elastic connector, and the rigid and elastic connector can be a rubber with a thickness and width of not less than 10 mm, that is, when connecting the screen 203 and the side wall 206 of the material paving bin 208, the rubber is arranged between the two, thereby playing a rigid connection with elasticity, so that the screen 203 can carry the raw materials and evacuate the raw materials.

[0025] Specifically, the vibration source 207 may be an electronic oscillator or a pneumatic actuator. The vibration energy is controlled by controlling the control current and air pressure of the electronic vibrator and the pneumatic actuator, thereby effectively controlling the amount of material falling.

[0026] Embodiment 2:

[0027] This embodiment only describes the technical features that are different from the first embodiment to avoid unnecessary redundancy.

[0028] The present embodiment is different from the first embodiment in the installation method of the vibration screen, or in other words, the connection relationship between the vibration screen and the paving bin 208 .

[0029] The vibrating screen includes a flat-plate structured screen 203, a vibration source 207 disposed on the screen 203, a support plate 204 for supporting the screen 203, and a plurality of elastic members 205 disposed between the screen 203 and the support plate 204. The support plate 204 is rigidly connected to the side wall 206 of the paving bin 208. The screen 203 is connected to the support plate 204 via a plurality of elastic members 205. The vibration source 207 is disposed on the surface of the screen 203 facing the inside of the paving bin 208. The elastic member 205 can reduce the loss of vibration energy, that is, after the vibration source 207 is triggered once, the elastic member 205 can maintain the vibration energy for a relatively long time. Figure 5 As shown, the elastic member 205 is a spring. More preferably, in order to effectively maintain the vibration energy, the spring is in a compressed state between the screen 203 and the support plate 204, thereby facilitating the vibration of the screen 203.

[0030] As an optimization of this embodiment, in order to facilitate material dropping, a plurality of windows are provided on the support plate 204, and the raw materials can flow out of the material laying bin 208 through the plurality of windows.

[0031] As a supplement to this embodiment, in order to prevent the raw materials from leaking from the screen 203 and the side wall 206 of the material paving bin 208, a flexible connector, such as cloth, rubber, etc., is provided between the screen 203 and the side wall 206 of the material paving bin 208.

[0032] As a supplement to this embodiment, in order to improve the ability of the screen 203 to withstand raw materials, a support plate 209 is further provided between the screen 203 and the support plate 204; the support plate 209 is welded, riveted or screwed to the support plate 204, the screen 203 and the support plate 209 are bolted together, and a buffer member, such as rubber, is provided between the two, so as to ensure that the screen 203 can well withstand the vibration energy from the elastic member 205.

[0033] Embodiment three:

[0034] An additive manufacturing device includes the paving device. The paving device with the vibrating screen is suitable for paving raw materials with high viscosity, thereby ensuring the fluidity of the raw materials with high viscosity, that is, making the paving surface flat and meeting the requirements.

[0035] Since the vibrating screen will not drop raw materials when not vibrating, the problem of missing raw materials in the open material bunker 208 when it is not in the working area is effectively avoided.

[0036] By adopting the material spreading device, the diameter of the material discharge port of the material spreading bin 208 no longer needs to be adjusted. Only the vibration energy of the vibration source 207 needs to be adjusted to achieve effective control of the material discharge amount, thereby avoiding the need to set various structures for adjusting the diameter of the material discharge port at the material spreading bin 208, making the structure of the material spreading bin 208 simpler and more conducive to maintenance, care and use.

[0037] At the same time, the vibration screen separates the raw materials, so that the fluidity of the raw materials flowing out of the paving bin 208 is better, thereby improving the surface quality of the paving surface. That is, when the fluidity of the raw materials is very good, problems such as pushing, pulling marks, material shortage, and material piling on the paving surface are avoided.

[0038] The above embodiments are merely descriptions of a typical application of the technical solution of the present invention, and reasonable expansion can be carried out on a reasonable basis without requiring creative work.

Claims

1. A material spreading device, characterized in that: The material paving bin (208) is provided with a raw material inlet and a raw material outlet, and a vibrating screen is provided at the raw material outlet. The vibrating screen is connected across the raw material outlet so that the raw material falls after passing through the vibrating screen. The vibrating screen comprises a screen (203) of a flat structure, a vibration source (207) arranged on the screen (203), a support plate (204) for supporting the screen (203), and a plurality of elastic members (205) arranged between the screen (203) and the support plate (204); the support plate (204) is rigidly connected to a side wall (206) of the material paving bin (208), the screen (203) is connected to the support plate (204) via the plurality of elastic members (205), and the vibration source (207) is arranged on a surface of the screen (203) facing the interior of the material paving bin (208); The elastic member (205) is in a compressed state between the screen (203) and the support plate (204); The support plate (204) is provided with a plurality of windows; A support plate (209) is provided between the screen (203) and the support plate (204).

2. The material spreading device according to claim 1, characterized in that: A flexible connection piece is provided between the screen (203) and the side wall of the material paving bin (208).

3. The material spreading device according to claim 1 or 2, characterized in that: The material spreading device further comprises a storage hopper (201) and a material discharge mechanism (202), wherein the material discharge mechanism (202) is arranged in the storage hopper (201), and the material discharge mechanism (202) is used to transport the raw materials from the storage hopper (201) to the material spreading bin (208) in a quantitative manner.

4. An additive manufacturing device, characterized in that: A paving device comprising any one of claims 1 to 3.

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