Air regulating system of efficient powder-saving powder spreading device

Abstract

The utility model relates to the technical field of metal additive manufacturing, and provides an air regulating system of a high-efficiency powder-saving powder spreading device, which comprises an air blowing port and an air suction port which are respectively arranged on two sides of a forming chamber and cover a forming breadth area, and further comprises a fan which is communicated with the air blowing port through an air blowing pipe, the draught fan is communicated with the air suction opening through an air suction pipe, a bypass pipe is arranged between the air blowing pipe and the air suction pipe, the bypass pipe is connected with an adjusting valve, and the air blowing pipe is connected with a first anemograph used for measuring the air speed of a main path and a second anemograph used for measuring the air speed of a branch path. By introducing the bypass pipe and the regulating valve, when the air speed of the original forming chamber is increased, the regulating valve is opened, the opening degree of the regulating valve is gradually increased, and total air generated by the fan is subjected to air distribution treatment, so that disturbance to an air field in the forming chamber in the operation process of the scraper is counteracted, and the stability of the air field in the forming chamber is improved; and the uniformity of the powder layer and the subsequent laser melting forming quality are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal additive manufacturing technical field, specifically, relate to a kind of air adjusting system of high-efficient powder-saving powder laying device. BACKGROUND

[0002] Selective Laser Melting (SLM), also known as powder laying type 3D printing technology, is an important manufacturing technology in the field of 3D printing. This technology uses laser energy to scan the laid metal powder according to the path planned by the three-dimensional model, melts and solidifies the metal powder, realizes metallurgical welding, and quickly manufactures high-density and high-strength metal components corresponding to the three-dimensional model.

[0003] During the powder laying process in the forming chamber, the scraper and the scraper assembly (referred to as scraper) will disturb the wind field of the forming chamber when passing through the forming surface, especially the upper surface of the forming surface. Specifically, as the scraper approaches the air outlet, passes through the center position, and then moves away from the air outlet, the wind speed on the upper surface of the forming surface first increases and then decreases, causing the powder to be scraped away, resulting in waste and affecting the forming quality of the parts. In addition, too fast movement of the scraper will further increase the wind speed on the forming surface, exacerbating the powder blowing phenomenon, which also adversely affects the forming quality. Currently, in order to avoid these problems, the scraper speed is usually set relatively slow, but this results in an increase in powder laying time, which restricts the improvement of powder laying efficiency. SUMMARY

[0004] The utility model aims at providing an air adjusting system of high-efficient powder-saving powder laying device, which solves the problem of powder blowing caused by the disturbance of the scraper to the wind field of the forming chamber during the powder laying process.

[0005] The utility model realizes the following technical scheme: an air adjusting system of high-efficient powder-saving powder laying device, comprising air outlets and air inlets arranged on both sides of a forming chamber respectively, the air outlets and air inlets covering the forming surface area, a fan, the fan being communicated with the air outlets through air blowing pipes, the fan being communicated with the air inlets through air suction pipes, a bypass pipe being arranged between the air blowing pipes and the air suction pipes, an adjusting valve being connected to the bypass pipe, a first air speed meter for measuring the total path wind speed and a second air speed meter for measuring the branch path wind speed being connected to the air blowing pipes, a first pipe valve being arranged on the branch path of the air blowing pipes, and a first filter being arranged in front of the fan.

[0006] Further, one end of the bypass pipe is connected to the air suction pipe through a Y-shaped pipe, and the middle pipe of the Y-shaped pipe is inclined towards the backflow direction of the air suction pipe.

[0007] Further, the diameter of the air blowing pipe is R, the distance between the first air speed meter and the fan is 4R-5R, and the distance between the first air speed meter and the connecting point of the bypass pipe and the air blowing pipe is 4R-5R.

[0008] Further, the second air speed meter is 4R-5R away from the blowing pipe, and the second air speed meter is 4R-5R away from the connection point of the bypass pipe and the blowing pipe.

[0009] Further, the bypass pipe is provided with a second filter close to one end of the air suction pipe.

[0010] Further, the second pipe valve is arranged on the air suction pipe main line, and the third pipe valve is arranged on the air suction pipe branch line.

[0011] Further, the blowing port and the air suction port are both arranged as open ports along the sliding direction of the scraper, and are flush with the upper surface of the forming web.

[0012] The utility model has at least the following advantages and beneficial effects:

[0013] (1) By introducing the bypass pipe and the regulating valve, when the air speed in the original forming chamber increases, the regulating valve is opened, and the opening degree of the regulating valve is gradually increased, the total air generated by the fan is divided and handled, so as to offset the disturbance to the air field in the forming chamber in the running process of the scraper, improve the stability of the air field in the forming chamber, and ensure the uniformity of the powder layer and the quality of the subsequent laser melting forming.

[0014] (2) Through the setting and installation position design of the first air speed meter and the second air speed meter, the change of the air speed can be monitored in real time and accurately, and reliable data support is provided for air volume regulation.

[0015] (3) Through the setting of the first filter and the second filter, the cleanliness of the forming chamber air path is ensured, and the service life of the equipment is prolonged, and at the same time, the second filter has a self-cleaning function. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The utility model provides a kind of high-efficiency powder-saving powder laying device's air regulating system and the connection schematic view of forming chamber.

[0017] Fig. 2 It is the sectional view of the forming chamber in the utility model.

[0018] Fig. 3 The utility model provides a kind of high-efficiency powder-saving powder laying device's air regulating system's structure schematic view.

[0019] Fig. 1 is a schematic view of the air regulating system of the high-efficiency powder-saving powder laying device according to the utility model. DETAILED DESCRIPTION

[0020] The specific implementation method is described below with reference to the accompanying drawings.

[0021] Example

[0022] like Figs. 1 to 3 As shown in this embodiment, a high-efficiency powder-saving powder spreading device with an air regulating system is disclosed, including an air blowing port 15 and an air suction port 16 respectively disposed on both sides of the forming chamber 1. The air blowing port 15 and the air suction port 16 both cover the forming area 11. The device also includes a fan 2. The fan 2 is connected to the air blowing port 15 through an air blowing pipe 3 and to the air suction port 16 through an air suction pipe 4. A bypass pipe 5 is disposed between the air blowing pipe 3 and the air suction pipe 4. A regulating valve 51 is connected to the bypass pipe 5. A first anemometer 31 for measuring the total wind speed and a second anemometer 32 for measuring the branch wind speed are connected to the air blowing pipe 3. A first pipe valve 33 is disposed on the branch of the air blowing pipe 3. A first filter 41 is disposed in front of the fan 2 in the air suction pipe 4. Specifically, the forming chamber 1 includes a forming surface 11, a powder receiving area 12, a scraper 13, and a linear module 14 for driving the scraper 13 in reciprocating linear motion. The linear module 14 is arranged on both sides of the forming surface 11, and the scraper 13 extends horizontally above the forming surface 11. During the forming and printing process, the powder spreading action is achieved by the scraper 13 pushing the powder from the powder receiving area 12 onto the forming surface 11. Air is drawn away from the air intake 16 after passing through the forming surface 11 from the air outlet 15. The cooperation of the air outlet 15 and the air intake 16 effectively controls the airflow distribution within the forming chamber, reducing the phenomenon of powder being blown away. The introduction of the bypass pipe 5 and the regulating valve 51 allows the airflow through the forming surface 11 to be dynamically adjusted according to actual needs, improving the system's flexibility and adaptability. The installation of the first anemometer 31 and the second anemometer 32 enables real-time monitoring of wind speed changes, providing data support for airflow adjustment. The first valve 33 can serve as the main control valve for the entire air conditioning system. The opening and closing of the first valve 33 directly controls the airflow in the forming chamber 1. The first filter 41 is installed on the return air main of the suction pipe 4 to filter the ash and slag drawn in during the overall working process, providing a clean argon atmosphere for the forming chamber. At the same time, it can prevent ash and slag from entering the fan 2, thus extending the service life of the equipment.

[0023] Furthermore, in a specific implementation, one end of the bypass pipe 5 provided in this embodiment of the present invention is connected to the suction pipe 4 via a slanted tee 52, with the middle pipe of the slanted tee 52 inclined towards the return direction of the suction pipe 4. Specifically, the inclined middle pipe of the slanted tee 52 can be a straight pipe or a curved pipe for transition, which can reduce airflow resistance and improve the efficiency of the fan 2. The slanted middle pipe of the slanted tee 52 inclined towards the return direction of the suction pipe 4 effectively avoids the branch flow of the air entering from the suction port 16 into the bypass pipe 5, which helps to ensure a smooth airflow transition and avoids the generation of turbulence.

[0024] Furthermore, in a specific implementation, the diameter of the blower pipe 3 provided in this embodiment of the present invention is D, the distance between the first anemometer 31 and the fan 2 is 4D to 5D, and the distance between the first anemometer 31 and the connection point between the bypass pipe 5 and the blower pipe 3 is 4D to 5D. Preferably, the distance between the second anemometer 32 and the blower pipe 3 is 4D to 5D, and the distance between the second anemometer 32 and the connection point between the bypass pipe 5 and the blower pipe 3 is 4D to 5D. This avoids turbulent interference at the fan 2 outlet, the connection point of the bypass pipe 5, and the inlet of the blower outlet 15, ensuring the accuracy of the wind speed measurement by the first anemometer 31 and the second anemometer 32. It also provides reliable data for calculating the bypass wind speed of the bypass pipe 5. In addition, the installation positions of the first anemometer 31 and the second anemometer 32 are designed based on the proportion of the diameter D of the blower pipe 3, facilitating the standardization and modularization of the system.

[0025] Furthermore, in a specific implementation, a second filter 53 is provided at the end of the bypass pipe 5 near the suction pipe 4 provided in this embodiment of the present invention. Specifically, the second filter 53 is installed on the bypass pipe 5. When the regulating valve 51 is closed, it can prevent ash and slag from entering the regulating valve 51, thus extending the service life of the equipment. When the regulating valve 51 is open, on the one hand, it can prevent ash and slag and black smoke generated during the laser sintering process from entering the forming chamber 1 through the bypass pipe 5 and the suction pipe 4, ensuring the cleanliness of the air path in the forming chamber 1; on the other hand, the air diverted from the fan 2 to the bypass pipe 5 can clean the second filter 53 to a certain extent, carrying away the ash and slag attached to the second filter 53, which is then sent to the first filter 41 for filtration.

[0026] Furthermore, in a specific implementation, a second pipe valve 42 is provided on the main suction pipe 4 provided in this embodiment of the present invention, and a third pipe valve 43 is provided on the branch suction pipe 4. Through the cooperation of the first pipe valve 33, the second pipe valve 42, the third pipe valve 43 and the regulating valve 51, the safe replacement of the first filter 41 and the second filter 53 can be achieved.

[0027] Furthermore, in specific implementations, the air inlet 15 and air outlet 16 provided in this embodiment of the present invention are both arranged in an open manner along the sliding direction of the scraper 13, and are flush with the upper surface of the forming surface 11. Specifically, the open length of the air inlet 15 and air outlet 16 is greater than the length of the forming surface 11, ensuring that the air field formed by the air inlet 15 and air outlet 16 can uniformly cover the forming surface 11, reducing the phenomenon of excessively high or low local wind speeds, and effectively reducing the situation of powder being scraped away.

[0028] It should be noted that when the scraper 13 approaches the air outlet 15, its movement creates a local high-pressure zone in front of it, causing the airflow to accelerate. At this time, the airflow from the air outlet 15 and the airflow generated by the scraper 13 overlap, increasing the wind speed on the upper surface of the forming surface 11. As the scraper 13 moves away from the air outlet 15, it continues to move, gradually moving further away from the air outlet 15, weakening the high-pressure zone in front of it and reducing the airflow speed. This change in wind speed directly affects the stability of the powder layer. Increased wind speed enhances the scouring effect of the airflow on the powder; if the wind speed is too high, some powder will be blown away from the forming surface 11, resulting in powder waste. Decreased wind speed weakens the scouring effect of the airflow on the powder, but the sudden change in wind speed may lead to uneven powder layer, affecting subsequent laser melting and forming quality.

[0029] The principle of the air conditioning method provided by this utility model is based on the influence of the movement of the scraper 13 on the wind speed change of the forming chamber 1. A bypass pipe 5 is introduced. When the original wind speed of the forming chamber 1 increases, the regulating valve 51 is opened and the opening degree of the regulating valve 51 is gradually increased to distribute the total air generated by the fan 2, thereby offsetting the disturbance of the air field in the forming chamber 1 by the scraper 13 during operation.

Claims

1. An air conditioning system for a high-efficiency powder-saving powder spreading device, comprising an air blowing port (15) and an air suction port (16) respectively disposed on both sides of a forming chamber (1), wherein the air blowing port (15) and the air suction port (16) both cover the forming area (11), characterized in that, It also includes a fan (2), which is connected to the air outlet (15) through a blower pipe (3) and the air inlet (16) through a suction pipe (4). A bypass pipe (5) is provided between the blower pipe (3) and the suction pipe (4). A regulating valve (51) is connected to the bypass pipe (5). A first anemometer (31) for measuring the wind speed of the main road and a second anemometer (32) for measuring the wind speed of the branch road are connected to the blower pipe (3). A first pipe valve (33) is provided on the branch of the blower pipe (3). A first filter (41) is provided in front of the fan (2) on the suction pipe (4).

2. The air conditioning system of the high-efficiency powder-saving powder spreading device according to claim 1, characterized in that, One end of the bypass pipe (5) is connected to the suction pipe (4) through a slanted tee (52), and the middle pipe of the slanted tee (52) is inclined toward the return direction of the suction pipe (4).

3. The air conditioning system of the high-efficiency powder-saving powder spreading device according to claim 1, characterized in that, The diameter of the blower pipe (3) is D, the distance between the first anemometer (31) and the fan (2) is 4D to 5D, and the distance between the first anemometer (31) and the connection point between the bypass pipe (5) and the blower pipe (3) is 4D to 5D.

4. The air conditioning system of the high-efficiency powder-saving powder spreading device according to claim 3, characterized in that, The distance between the second anemometer (32) and the air blower (3) is 4D to 5D, and the distance between the second anemometer (32) and the connection point between the bypass pipe (5) and the air blower (3) is 4D to 5D.

5. The air conditioning system of the high-efficiency powder-saving powder spreading device according to claim 1, characterized in that, A second filter (53) is provided at one end of the bypass pipe (5) near the suction pipe (4).

6. The air conditioning system of the high-efficiency powder-saving powder spreading device according to claim 1, characterized in that, A second valve (42) is provided on the main air intake pipe (4), and a third valve (43) is provided on the branch air intake pipe (4).

7. The air conditioning system of the high-efficiency powder-saving powder spreading device according to claim 1, characterized in that, Both the air inlet (15) and the air outlet (16) are arranged in an open manner along the sliding direction of the scraper (13) and are flush with the upper surface of the forming surface (11).

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