Powder material conveying device and 3D printing equipment
The powder material conveying device that prevents blockage through negative pressure conveying and backblowing structures solves the problems of blockage and low efficiency of the 3D printing sand supply system, and realizes efficient and stable powder material conveying, which is suitable for the simultaneous supply needs of multiple equipment.
Patent Information
- Application Number
- CN202421496938.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing 3D printing sand supply system is prone to clogging and has low efficiency during the conveying of powder materials, resulting in low printing efficiency or even interruption of equipment, and cannot guarantee printing quality.
The powder material is transported by negative pressure, and the backblowing structure is used to prevent the filter structure from being blocked. The upper and lower cavity filter structure is designed, combined with arc-shaped pipelines and sensor controls to prevent the powder from being reversed and wear.
It improves the conveying efficiency of powder materials, prevents clogging, ensures smooth sand supply when multiple equipment works simultaneously, extends equipment life, and improves printing quality and efficiency.
Smart Images
Figure CN223073485U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of 3D printing, and particularly to a powder material conveying device in a 3D printing sand supply system. Background Art
[0002] 3D printing technology is actually a common name for additive technology. Its principle is to evenly lay a layer of forming material (such as ceramsite sand, metal powder, etc.) in the printing area. A binder is pre-added to the powdery forming material. The print head is controlled by a program to spray liquid material in a specific area. When the sprayed liquid material reacts chemically with the binder in the forming material, the powdery forming material will harden. After laying each layer of forming material, the workbench descends a certain height, and the print head sprays the liquid material again. This cycle is repeated until the formation of the preset part is finally completed.
[0003] At present, the forming materials for 3D printing are gradually becoming rich. Different forming materials are affected by factors such as density, fluidity, and the temperature and humidity of the environment. There will be problems such as varying degrees of blockage or low conveying efficiency in the sand supply system during the process of conveying sand, resulting in low printing efficiency of the equipment, and even sand supply blockage and printing interruption, and the quality of the printing process cannot be guaranteed. Summary of the Utility Model
[0004] Based on this, in view of the problems of blockage and low conveying efficiency in the existing sand supply system during the sand conveying process, it is necessary to provide a powder material conveying device for a 3D printing system. This device can convey powder materials through negative pressure and prevent the filter structure from being blocked through an anti-blowing structure, effectively solving the problem of powder material blocking the pipeline and improving the conveying efficiency of powder materials.
[0005] A powder material conveying device includes a vacuum pump, a negative pressure storage tank connected to the vacuum pump, and a plurality of powder hoppers connected to the negative pressure storage tank. Each powder hopper is divided into an upper cavity and a lower cavity by a filter structure; the upper cavity is connected to the negative pressure storage tank through a first pipeline, and the lower cavity is connected to a powder bag through a second pipeline; an anti-blowing structure is further arranged in the upper cavity to blow back the powder adhered to the filter structure.
[0006] Further, the filter structure includes a connecting plate and a plurality of filter bags arranged below the connecting plate; the powder hopper is divided into an upper cavity and a lower cavity by the connecting plate; one end of each filter bag close to the upper cavity passes through the connecting plate and communicates with the upper cavity.
[0007] Further, a sealing ring is arranged on the outer peripheral edge of the connecting plate.
[0008] Further, the aperture of the filter bag is smaller than the particle size of the powder.
[0009] Further, the backflush structure is connected to the outside atmosphere through a pipeline. After the powder material is conveyed, the backflush structure is started to convey the outside atmosphere to the filter bag, and the powder adhered to the filter bag is backflushed off.
[0010] Further, a section of the second pipeline close to the lower cavity is arranged in an arc shape.
[0011] Further, a baffle is also arranged on the inner wall of the lower cavity, and the powder material entering the lower cavity first falls onto the baffle.
[0012] Further, a high-level sensor is arranged on the upper side of the lower cavity.
[0013] Further, a low-level sensor is arranged on the lower side of the lower cavity.
[0014] A 3D printing device adopts the powder material conveying device as described above.
[0015] For the powder material conveying device and the 3D printing device provided by the present utility model, the negative pressure storage tank is connected to multiple powder hoppers, and powder is simultaneously conveyed into each powder hopper through negative pressure, solving the problem of low sand supply efficiency when multiple devices work simultaneously. In addition, the powder hopper is divided into upper and lower cavities by a filtering structure. The filtering structure conveys negative pressure to the lower cavity and can prevent the powder in the lower cavity from being sucked back into the upper cavity and the negative pressure storage tank. At the same time, a backflush structure is also arranged in the upper cavity. After the powder material is conveyed, the backflush structure is started to backflush the filtering structure to prevent the powder from blocking the backflush structure. Further, in this device, the powder conveying pipeline is arranged in an arc shape to prevent the powder from wearing the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of the negative pressure system of the powder material conveying device of the present utility model;
[0017] Figure 2 It is a schematic diagram of the powder hopper structure of the powder material conveying device of the present utility model;
[0018] Figure 3 It is a schematic diagram of the filtering structure of the powder material conveying device of the present utility model.
[0019] REFERENCE SIGNS
[0020] 1, vacuum pump; 2, negative pressure storage tank; 3, powder hopper; 4, upper cavity; 5, lower cavity; 6, backflush structure; 7, filtering structure; 8, baffle; 9, feed inlet; 10, second pipeline; 11, first pipeline; 71, connecting plate; 72, filter bag; 73, sealing ring DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.
[0022] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0024] In one embodiment, a powder material conveying device and a 3D printing device of the present utility model include a vacuum pump, a negative pressure storage tank connected to the vacuum pump, and a plurality of powder hoppers connected to the negative pressure storage tank. The powder hopper is divided into an upper cavity and a lower cavity by a filtering structure; the upper cavity is connected to the negative pressure storage tank through a first pipeline, and the lower cavity is connected to a powder bag through a second pipeline; an anti-blowing structure is further provided in the upper cavity to blow back the powder adhering to the filtering structure through the anti-blowing structure.
[0025] The powder material conveying device and the 3D printing device provided by the present utility model connect the negative pressure storage tank with a plurality of powder hoppers and simultaneously convey powder into each powder hopper through negative pressure, solving the problem of low sand supply efficiency when multiple devices work simultaneously; in addition, the powder hopper is divided into upper and lower cavities by a filtering structure, the filtering structure conveys negative pressure to the lower cavity, and can prevent the powder in the lower cavity from being sucked back into the upper cavity and the negative pressure storage tank. At the same time, an anti-blowing structure is also provided in the upper cavity. After the powder conveying is completed, the anti-blowing structure is started to blow back the filtering structure to prevent the powder from clogging the anti-blowing structure.
[0026] The following describes the powder material conveying device and the 3D printing device with specific embodiments to further understand the inventive concept of the powder material conveying device and the 3D printing chamber device.
[0027] In one embodiment, as Figure 1-2 shown, the powder material conveying device includes a vacuum pump 1, a negative pressure storage tank 2 connected to the vacuum pump 1, and a plurality of powder hoppers 3 connected to the negative pressure storage tank 2. The vacuum pump 1 is connected to the negative pressure storage tank 2 through a connecting pipeline. When the vacuum pump 1 is started, the air in the negative pressure storage tank 2 is pumped into a vacuum state, and the negative pressure value in the negative pressure storage tank 2 can be increased by selecting vacuum pumps 1 with different powers, so as to supply powder materials to the powder hoppers 3 of one or more 3D printing devices. Each of the powder hoppers 3 is divided into an upper cavity 4 and a lower cavity 5 by a filtering structure 7; the upper cavity 4 is connected to the negative pressure storage tank 2 through a first pipeline 11, and the lower cavity 5 is connected to a powder bag through a second pipeline 10; an anti-blowing structure 6 is further arranged in the upper cavity 4 to blow back the powder adhered to the filtering structure 7. Preferably, a high-level sensor is arranged on the upper side of the lower cavity 5. In this embodiment, the filtering structure 7 prevents the powder material from being sucked back into the negative pressure storage tank 2 and the vacuum pump 1. When powder material needs to be conveyed, the manual valve on the side of the negative storage tank is opened, and the inside of the powder hopper 3 is pumped into a vacuum by the action of negative pressure. The lower cavity 5 sucks and stores the powder material in the powder bag through the second pipeline 10 until the high-level sensor detects a signal that the powder material is full. The high-level sensor feeds the signal back to the PLC, and the valve at the feed port of the distribution hopper 3 is controlled to close by the PLC. The powder storage in the powder hopper 4 is completed. When the 3D printing device sends a feeding request signal, the butterfly valve below the powder hopper 3 is opened to add the powder material into the 3D printing device for use. When the 3D printing device gives a stop feeding signal, the PLC controls the butterfly valve to close, and at this time the feeding stops. The PLC controls the anti-blowing structure to start and blow back the powder material adhered to the filtering structure 7, so as to prevent the powder material from blocking the filtering structure. According to the above process, the powder material conveying device can supply materials to one or more 3D printing devices simultaneously.
[0028] In another embodiment, as Figure 3 shown, the filtering structure 7 includes a connecting plate 71 and a plurality of filter bags 72 arranged below the connecting plate 71; the powder hopper 3 is divided into an upper cavity 4 and a lower cavity 5 by the connecting plate 71; one end of each filter bag 72 close to the upper cavity 4 passes through the connecting plate 71 and communicates with the upper cavity 4. Preferably, a sealing ring 73 is arranged on the outer peripheral edge of the connecting plate 71. Preferably, the aperture of the filter bag 72 is smaller than the particle size of the powder, and the material of the filter bag is a metal material. By arranging a plurality of filter bags 72, on the one hand, the negative pressure can be conveyed to the lower cavity 5, and on the other hand, the powder in the lower cavity 5 can be blocked from being sucked into the upper cavity 4 or even the negative pressure storage tank 2 by the filter bags 72.
[0029] In another embodiment, the backflush structure 6 is communicated with the outside atmosphere through a pipeline. After the powder material is conveyed, the backflush structure 6 is started to convey the outside atmosphere to the filter bag 72, and the powder adhered to the filter bag 72 is backflushed. Because during the long-term use of the filtering structure 7, a layer of powder material will be wrapped on the filter bag 72, affecting the conveyance of negative pressure from the upper cavity 4 to the lower cavity 5. Through the backflush structure 6, after the powder material is conveyed, the backflush structure 6 introduces a positive pressure into the upper cavity 4 to blow positive pressure air to the filter bag 72, so as to blow off the powder material wrapped outside the filter bag 72, thereby ensuring normal negative pressure conveyance.
[0030] In another embodiment, as Figure 2 shown, a section of the second pipeline 10 close to the lower cavity 5 is arranged in an arc shape, and a baffle 8 is further arranged on the inner wall of the lower cavity 5. The powder material entering the lower cavity 5 first falls onto the baffle 8. Because when the powder material is sucked into the second pipeline 10 and the powder hopper 3 by negative pressure, due to high speed and large powder flow rate, there will be relatively large wear on the pipeline and the distributor hopper during long-term use. Therefore, in this embodiment, by designing the turning part of the pipeline into an arc shape, on the one hand, the wear of the powder material on the pipe wall is reduced; on the other hand, as Figure 1 shown, when the second pipeline 10 enters the powder hopper 3, it enters along the tangent direction of the arc. When the powder material is sucked in, its movement trajectory is a spiral circulation. Due to gravity, the powder material circulates at the feed inlet 9 and then falls to the bottom of the sand hopper, reducing the wear on the inner wall below the feed inlet 9, and the powder material is scattered after passing through the spiral circulation, avoiding the agglomeration and separation of the powder material and making the feeding smoother. In addition, as Figure 1 shown, a baffle 8 is also arranged beside the feed inlet of the second pipeline 10. When the powder material enters the powder hopper 2 and circulates in a spiral shape along the circumference of the feed inlet 9, it has a relatively large impact force on the inner wall of the powder hopper 3. After long-term use, it will cause great wear on the inner wall of the distributor hopper 3. In this embodiment, the baffle 8 is used to block the impact force of the powder material on the inner wall of the powder hopper 3, so that when the powder material enters, it directly hits the baffle 8, thereby protecting the inner wall of the powder hopper 3 and greatly improving the service life of the powder hopper 3.
[0031] In another embodiment, a low-level sensor is further arranged on the lower side of the lower cavity 5. When the powder level in the lower cavity 5 is lower than the standard value, the low-level sensor sends a signal to the PLC controller to start the negative pressure suction feeding program.
[0032] A 3D printing device, which adopts a powder material conveying device as described above.
[0033] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0034] The above-described embodiments only express several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.
Claims
1. A powder material conveying device, characterized in that, The powder material conveying device includes a vacuum pump (1), a negative pressure storage tank (2) connected to the vacuum pump (1), and a plurality of powder hoppers (3) connected to the negative pressure storage tank (2). Each of the powder hoppers (3) is separated into an upper cavity (4) and a lower cavity (5) by a filtering structure (7); the upper cavity (4) is connected to the negative pressure storage tank (2) through a first pipeline (11), and the lower cavity (5) is connected to a powder bag through a second pipeline (10); an air back-blowing structure (6) is further arranged in the upper cavity (4) to back-blow the powder adhered to the filtering structure (7).
2. The powder material conveying device according to claim 1, wherein The filtering structure (7) includes a connecting plate (71) and a plurality of filter bags (72) arranged below the connecting plate (71); the powder hopper (3) is separated into an upper cavity (4) and a lower cavity (5) by the connecting plate (71); one end of each of the filter bags (72) close to the upper cavity (4) passes through the connecting plate (71) and communicates with the upper cavity (4).
3. The powder material conveying device according to claim 2, wherein A sealing ring (73) is arranged on the outer peripheral edge of the connecting plate (71).
4. A powder material conveying device according to claim 2, characterized in that, The aperture of the filter bag (72) is smaller than the particle size of the powder.
5. A powder material conveying device according to claim 2, characterized in that, The air back-blowing structure (6) is communicated with the outside atmosphere through a pipeline. After the powder conveying is completed, the air back-blowing structure (6) is started to convey the outside atmosphere to the position of the filter bag (72) to blow off the powder adhered to the filter bag (72).
6. A powder material conveying device according to claim 1, characterized in that, A section of the second pipeline (10) close to the lower cavity (5) is arranged in an arc shape.
7. The powder material conveying device according to claim 1, characterized in that, A baffle (8) is further arranged on the inner wall of the lower cavity (5), and the powder entering the lower cavity (5) first falls onto the baffle (8).
8. A powder material conveying device according to claim 1, characterized in that, A high-level sensor is arranged on the upper side of the lower cavity (5).
9. The powder material conveying device according to claim 8, wherein A low-level sensor is arranged on the lower side of the lower cavity (5).
10. A 3D printing device, characterized in that, The 3D printing device adopts the powder material conveying device according to any one of claims 1-9.