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CN-224224533-U - Auxiliary preheating powder paving device for 3D printing

CN224224533UCN 224224533 UCN224224533 UCN 224224533UCN-224224533-U

Abstract

The utility model relates to the technical field of 3D printing equipment, in particular to a 3D printing auxiliary preheating powder paving device which comprises a powder hopper assembly, a powder supply bin and a heating assembly, wherein the powder hopper assembly is arranged on an equipment main body and used for paving powder, the powder supply bin is positioned above the powder hopper assembly and used for providing powder materials, the heating assembly is arranged in the powder hopper assembly, the heating assembly comprises a heating pipe which is embedded in the powder hopper assembly, spiral electric heating alloy wires are uniformly distributed in the heating pipe along the central axial direction in the pipe, and the heating assembly also comprises a thermocouple sensor used for detecting the heating temperature of the powder materials. According to the utility model, the powder hopper assembly and the heating assembly are used for preheating the SLS3D printing powder in advance, so that the preheating time during SLS3D printing is reduced, and the printing efficiency is improved.

Inventors

  • CAO XIAOCHANG
  • CHEN RONGKUN

Assignees

  • 东莞理工学院

Dates

Publication Date
20260512
Application Date
20250612

Claims (7)

  1. 1. The 3D printing auxiliary preheating powder paving device is characterized by comprising a powder hopper assembly (1) which is arranged on a device main body and used for paving powder, a powder supply bin (2) which is arranged above the powder hopper assembly (1) and used for providing powder and a heating assembly (3) which is used for preheating the powder, wherein the heating assembly (3) is arranged in the powder hopper assembly (1); The heating assembly (3) comprises a heating pipe (31) which is embedded in the powder hopper assembly (1), spiral electric heating alloy wires are uniformly distributed in the heating pipe (31) along the axial direction of the center in the pipe, and the heating assembly (3) further comprises a thermocouple sensor (32) for detecting the heating temperature of the powder; When in printing, a power supply is connected to the electrothermal alloy wire, the heating pipe (31) starts to heat, and after the thermocouple sensor (32) detects the temperature required by heating, the powder temporarily stored in the powder supply bin (2) enters the powder hopper assembly (1) to be preheated and then starts to be paved.
  2. 2. The 3D printing auxiliary preheating powder spreading device according to claim 1, wherein the powder bucket assembly (1) comprises a powder spreading bucket (11) for containing powder materials and a heating cavity (12) arranged on the periphery of the powder spreading bucket (11), the heating pipe (31) and the thermocouple sensor (32) are arranged in the heating cavity (12), and the powder spreading bucket (11) is positioned below the powder supply bin (2).
  3. 3. The 3D printing auxiliary preheating powder spreading device according to claim 2, wherein a leakage groove (111) for falling powder is formed in the bottom of the powder spreading hopper (11), and the width of the leakage groove (111) is 2mm.
  4. 4. The 3D printing auxiliary preheating powder spreading device according to claim 3, wherein a convex rib (112) is arranged at the bottom of the powder spreading bucket (11), and the convex rib (112) is positioned at two sides of the leakage groove (111).
  5. 5. The 3D printing auxiliary preheating powder spreading device according to claim 2, wherein the powder bucket assembly (1) further comprises a guide optical axis (13) for supporting the powder spreading bucket (11) to perform reciprocating powder spreading operation, sliding blocks (14) are arranged on two side walls of the powder spreading bucket (11), the sliding blocks (14) are sleeved on the guide optical axis (13) in a sliding mode, and the guide optical axis (13) is arranged on a printer device body.
  6. 6. The 3D printing auxiliary preheating powder spreading device is characterized in that a powder outlet (21) for guiding out powder materials and a baffle plate (22) for controlling the powder materials to be guided out are arranged on the powder supply bin (2), one side edge of the baffle plate (22) is hinged to one side of the powder outlet (21), an electric telescopic rod (23) for driving the baffle plate (22) to open and close is hinged to the baffle plate (22), and the electric telescopic rod (23) is hinged to a printer device main body.
  7. 7. The 3D printing auxiliary preheating powder spreading device according to claim 6, wherein a photoelectric switch (24) is connected to the baffle (22).

Description

Auxiliary preheating powder paving device for 3D printing Technical Field The utility model relates to the technical field of 3D printing equipment, in particular to a 3D printing auxiliary preheating powder paving device. Background The preheating treatment of SLS3D printing is a key step for improving printing quality, reducing shrinkage of printing materials, preventing warping from leaving a printing platform, preventing caking and improving printing efficiency, especially in the treatment of high-temperature materials (such as ABS, nylon, PC and other materials). The common preheating temperature of the nonmetal during the preheating treatment is 80-200 ℃. However, in the current preheating process, the irradiation of the powder bed of the SLS3D printer by using an infrared heating lamp tube needs to be performed in advance for 30-60 minutes to ensure that the preheating temperature of the powder bed is uniform. Therefore, the printing efficiency of the SLS3D printer is greatly reduced, and stripes are easily generated when powder is paved by a single scraper. Disclosure of utility model The utility model aims to solve the technical problem of providing a 3D printing auxiliary preheating powder paving device, which preheats SLS3D printing powder in advance through a powder hopper assembly and a heating assembly, reduces the preheating time during SLS3D printing and improves the printing efficiency. In order to solve the technical problems, the utility model adopts the following technical scheme: The 3D printing auxiliary preheating powder paving device comprises a powder hopper assembly, a powder supply bin and a heating assembly, wherein the powder hopper assembly is arranged on a device main body and used for paving powder, the heating assembly is arranged above the powder hopper assembly and used for providing powder, the heating assembly is arranged in the powder hopper assembly and comprises a heating pipe which is embedded in the powder hopper assembly, spiral electrothermal alloy wires are uniformly distributed in the heating pipe along the central axial direction of the pipe, the heating assembly further comprises a thermocouple sensor used for detecting the heating temperature of the powder, when in printing, a power supply is connected to the electrothermal alloy wires, the heating pipe starts to heat, and after the thermocouple sensor detects the temperature required by heating, the powder temporarily stored in the powder supply bin enters the powder hopper assembly to be preheated and then starts to perform powder paving operation. Further, the powder hopper assembly comprises a powder hopper for containing powder and a heating cavity arranged on the periphery of the powder hopper, wherein the heating pipe and the thermocouple sensor are arranged in the heating cavity, and the powder hopper is positioned below the powder supply bin. Further, a leakage groove for falling out of powder materials is formed in the bottom of the powder spreading hopper, and the width of the leakage groove is 2mm. Further, the bottom of the powder spreading bucket is provided with a convex edge, and the convex edge is positioned at two sides of the leakage groove. Further, the powder hopper assembly further comprises a guiding optical axis for supporting the powder paving operation of the powder paving hopper in a reciprocating mode, sliding blocks are arranged on two side walls of the powder paving hopper, the sliding blocks are sleeved on the guiding optical axis in a sliding mode, and the guiding optical axis is arranged on the printer equipment main body. Further, be equipped with the play powder mouth that is used for powder material to derive and be used for controlling the baffle that powder material derived on the powder supply storehouse, a side of baffle articulated install in one side of play powder mouth, still articulated on the baffle have and be used for the drive the electric telescopic handle that the baffle opened and shut, electric telescopic handle articulates on printer equipment main part. Furthermore, a photoelectric switch is connected to the baffle. The utility model has the beneficial effects that: In the in-service use scene, powder material pre-fills in supplying the powder storehouse and temporarily stores, and powder fill subassembly is used for spreading the powder operation to the powder bed of SLS3D printer when printing, and design heating element on powder fill subassembly is to powder material preheat the back and spread the powder again and can effectively improve the printing quality, reduce printing material shrink. During operation, the electric heating alloy wire is powered on, the heating pipe is heated, the powder bucket component is preheated, the thermocouple sensor is used for monitoring the temperature of the powder bucket component, the printer equipment is used for controlling the heating pipe of the powder bucket component through the feedback of the sensor by the