Grid compensation scanning system

Abstract

The utility model discloses a kind of grid compensation scanning systems, frame driving device drives mobile wind field frame intermittent horizontal movement in the forming space of 3D printing equipment along X direction, the mobile wind field frame of grid structure is formed with several lattices being arranged along X direction interval, several groups of laser galvanometer system along X direction arrangement respectively scans the powder field in each lattice range of mobile wind field frame, each lattice two side walls are respectively equipped with several air outlet and air inlet, air supply main pipe and return air main pipe on the outer side wall of mobile wind field frame are respectively communicated with each air outlet and air inlet, air supply main pipe is connected with the one end of air supply slide pipe of length adjustable, return air main pipe is connected with the one end of return air slide pipe of length adjustable, air supply slide pipe and return air slide pipe other end are respectively communicated with the air inlet and air outlet of protective gas circulation system, the utility model is favorable to realize fine scanning and efficient scanning, guarantee workpiece quality.

Description

Technical Field

[0001] This utility model relates to a 3D printing device, and more particularly to a grid compensation scanning system. Background Technology

[0002] With the popularization of 3D printing, the workpieces produced are becoming increasingly refined and larger in size. This has created two main contradictions. On the one hand, the refinement requires a clean forming space, free of dust and smoke. Large-area scanning necessitates multiple lasers working simultaneously to shorten forming time and thus quickly complete 3D forming. However, the protective gas flow field is too large, even with jets, to meet the requirements, resulting in splashes and smoke, which seriously affect the forming quality of metal 3D parts. While large-area scanning requires multiple lasers working simultaneously to shorten forming time and quickly complete 3D forming, the large size of the laser galvanometers (approximately 350x600 (including beam expander, collimator, etc., scanning area approximately 400x400) makes proper arrangement impossible. A 3-axis arrangement is possible, but control is complex and unstable. A top-and-bottom arrangement raises concerns about the fit and manufacturing of the two objective lens groups. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a grid compensation scanning system, which can achieve rapid large-area scanning and has high forming accuracy.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a grid compensation scanning system, including a laser galvanometer system, a moving air field frame, a frame driving device, an air supply main duct, a return air main duct, an air supply slide pipe, a return air slide pipe, and a protective air circulation system. The X and Y directions are defined as two mutually perpendicular directions on a horizontal plane. The moving air field frame is horizontally movable along the X direction and installed within the forming space of the 3D printing equipment. The frame driving device drives the moving air field frame to intermittently reciprocate horizontally. The moving air field frame has a grid structure, forming several grids spaced apart along the X direction. Several sets of laser galvanometer systems are arranged along the X direction. Each laser galvanometer system can scan the powder field within a grid area of ​​the moving wind field frame. Each grid of the moving wind field frame has several air inlets on one side wall and several air inlets on the other side wall. The outer wall of the moving wind field frame is also equipped with a main air supply pipe and a main air return pipe. Each air inlet is connected to the main air supply pipe, and each air inlet is connected to the main air return pipe. The main air supply pipe is connected to one end of an adjustable-length air supply slide pipe, and the main air return pipe is connected to one end of an adjustable-length air return slide pipe. The other ends of the air supply slide pipe and the air return slide pipe are connected to the air return port and air supply port of the protective gas circulation system, respectively.

[0005] As a further improvement of the utility model, each grid of the mobile wind farm frame is provided with at least one air supply channel extending along the Y direction on one side wall, and each grid of the mobile wind farm frame is provided with at least one return air channel extending along the Y direction on the other side wall. The air outlet is located on the side wall of the air supply channel, and the air inlet is located on the side wall of the return air channel. The air supply channel and the return air channel are respectively connected to the main air supply pipe and the main air return pipe. The multiple air supply channels and the multiple return air channels are arranged at intervals in the vertical direction.

[0006] As a further improvement of the utility model, both the supply air main duct and the return air main duct extend along the X direction, and the supply air main duct and the return air main duct are respectively located on the two side walls of the mobile wind farm frame along the Y direction. The supply air channel and the return air channel are respectively connected to the side walls of the supply air main duct and the return air main duct perpendicularly through pipe joints.

[0007] As a further improvement to the utility model, the air supply slide pipe and the return air slide pipe are telescopic pipes whose length can be elastically extended and retracted.

[0008] As a further improvement of the utility model, one end of the air supply slide pipe and the return air slide pipe are respectively connected to the air supply main pipe and the return air main pipe in a sealed plug-in connection that allows them to slide relative to each other.

[0009] As a further improvement of the utility model, the internal space of the forming chamber of the 3D printing equipment forms a forming space, the movable air field frame is installed on the side wall of the forming chamber, and the laser galvanometer system is fixedly installed on the top of the forming chamber. The laser emitted by the laser galvanometer system can scan the powder field in the grid of the movable air field frame.

[0010] As a further improvement of the utility model, the forming chamber of the 3D printing equipment is provided with a movable box that can move horizontally along the X direction and a box driving device that drives the movable box to move horizontally intermittently. The movable box and the powder field plane together form a movable forming space. The movable air field frame is installed on the inner side wall of the movable box, and the laser galvanometer system is fixedly installed on the upper end of the movable box. The laser emitted by the laser galvanometer system can scan the powder field in the grid of the movable air field frame through the transparent top plate of the movable box.

[0011] As a further improvement of the utility model, the movable box is also provided with a precision grating measuring device on both sides of the Y direction. The precision grating measuring device can measure the X displacement of the movable box along the two sides of the Y direction. The precision grating measuring device can perform closed-loop calculation based on the measurement data and then correct the difference between the current scanning zero point and the previous scanning zero point, so that the current scanning zero point coincides with the previous scanning zero point.

[0012] As a further improvement of the utility model, the mobile wind farm frame is provided with a guide rail extending along the X direction. The frame driving device includes a first motor, a first reducer and a first camshaft. The first camshaft is rotatably mounted on the side wall of the forming space along the Y direction. A first cam is coaxially fixedly connected to the outer side wall of the first camshaft. The rotation of the first cam can drive the guide rail to move along the X direction. The first motor drives the first camshaft to rotate forward and backward through the first reducer.

[0013] As a further improvement of the utility model, the side wall of the forming space along the Y direction is also provided with an adjustment groove extending vertically. A second camshaft is inserted into the adjustment groove and can slide vertically. A second cam is coaxially fixedly connected to the second camshaft. The rotation of the second cam can drive the guide rail to move in the vertical direction. A second motor and a second reducer are also provided. The second motor drives the second camshaft to rotate forward and backward through the second reducer.

[0014] The beneficial technical effects of this utility model are as follows: This utility model divides an unstable large wind field into several independent and stable narrow wind fields by using a moving wind field frame. This can meet the cleanliness requirements of the scanning space during scanning, avoid the influence of dust during scanning, and facilitate fine scanning. Furthermore, this utility model uses multiple lasers to simultaneously scan the powder field in each grid within the moving wind field frame, resulting in a large scanning area. After one scan is completed, the moving wind field frame only needs to be moved a small distance in the X direction to expose the area covered by the moving wind field frame, and then another scan can be performed to complete the scanning of one layer of powder field. This facilitates efficient scanning and processing. This utility model also uses a precision grating measuring device to measure the variables after the moving wind field frame has moved, correcting the overlap between the original zero point of the current layer and the zero point of the previous layer, so that the current layer will not misalign with the previous layer, thereby ensuring the quality of the workpiece. Attached Figure Description

[0015] Figure 1 A schematic diagram of the wind speed curve within the formed space;

[0016] Figure 2 This is a schematic diagram illustrating the laser scanning principle of a utility model.

[0017] Figure 3 This is a schematic diagram of the mobile wind farm frame structure of a utility model.

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of this utility model;

[0019] Figure 5 The first diagram illustrates the principle of sequential scanning using a moving box in this utility model.

[0020] Figure 6The second diagram illustrates the principle of sequential scanning using a moving box in this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example: A grid-compensated scanning system includes a laser galvanometer system 1, a moving airflow frame 2, a frame drive device, an air supply duct 3, a return air duct 4, an air supply slide pipe 5, a return air slide pipe 6, and a protective air circulation system. The X and Y directions are defined as two mutually perpendicular directions on a horizontal plane. The moving airflow frame 2 is horizontally movable along the X direction and installed within the forming space 17 of a 3D printing equipment. The frame drive device drives the moving airflow frame 2 to intermittently reciprocate horizontally. The moving airflow frame 2 has a grid structure, forming several grids 7 spaced apart along the X direction. Several sets of laser galvanometer systems 1 are arranged along the X direction. Each set of laser galvanometer systems 1 can scan the moving airflow... The powder field within a grid 7 of the field frame 2 is scanned. Each grid 7 of the mobile wind field frame 2 has several air inlets 8 on one side wall and several air inlets 9 on the other side wall. The outer wall of the mobile wind field frame 2 is also provided with a main air supply pipe 3 and a main air return pipe 4. Each air inlet 8 is connected to the main air supply pipe 3, and each air inlet 9 is connected to the main air return pipe 4. The main air supply pipe 3 is connected to one end of an adjustable-length air supply slide pipe 5, and the main air return pipe 4 is connected to one end of an adjustable-length air return slide pipe 6. The other ends of the air supply slide pipe 5 and the air return slide pipe 6 are connected to the air return port and air supply port of the protective air circulation system, respectively.

[0023] By setting a grid-type moving airflow frame 2 within the forming space 17 of the 3D printing equipment, the moving airflow frame 2 is equipped with an array of air outlets 8 and air inlets 9 for ejecting and absorbing protective gas. The air outlets 8 are connected to the air outlet of the protective gas filtration system via the main air supply pipe 3 and the air supply slide pipe 5, and the air inlets 9 are connected to the return air outlet of the protective gas filtration system via the return air main air pipe 4 and the return air slide pipe 6. The moving airflow frame 2 with the above structure divides the unstable large airflow into several independent and stable narrow airflows, thereby enabling the successful completion of large-format metal 3D printing.

[0024] A multi-column laser galvanometer system 1 can be installed above the mobile wind field frame 2, enabling simultaneous multi-column scanning and significantly reducing scanning time. After scanning, the mobile wind field frame 2 only needs to be moved once to expose the parts that were blocked during the previous scan, and then scanned again to complete a large-format scan of 2-3 meters wide. Because the number of support movements is small and the intervals are short, the impact on the temperature gradient of the workpiece is minimal, which is beneficial to improving the forming quality of the workpiece and has unparalleled advantages for the manufacturing of large workpieces.

[0025] Each cell 7 of the mobile airflow frame 2 has at least one air supply channel extending along the Y direction on one side wall, and at least one return air channel extending along the Y direction on the other side wall. The air inlets 8 are located on the side walls of the air supply channels, and the air inlets 9 are located on the side walls of the return air channels. The air supply channels and return air channels are connected to the main air supply pipe 3 and the main air return pipe 4, respectively. Multiple air supply channels and multiple return air channels are arranged at intervals along the vertical direction. This structure can supply protective gas to all air supply channels through a single main air supply pipe 3 and absorb gas from all return air channels through a single main air return pipe 4. The overall structure is simple, and the air inlets 8 and air inlets 9 are evenly spaced along the Y direction, with consistent protective gas pressure from all air inlets 8, resulting in uniform airflow within the airflow field and helping to ensure scanning quality.

[0026] Both the main air supply pipe 3 and the main air return pipe 4 extend along the X direction, and the main air supply pipe 3 and the main air return pipe 4 are located on the two side walls of the mobile wind farm frame 2 along the Y direction, respectively. The air supply channel and the air return channel are respectively connected to the side walls of the main air supply pipe 3 and the main air return pipe 4 perpendicularly through the pipe joint 10.

[0027] The supply air slide 5 and return air slide 6 are telescopic pipes whose length can be elastically extended and retracted. By designing the supply air slide 5 and return air slide 6 as elastically extendable and retractable structures, when the main supply air pipe 3 and the main return air pipe 4 move with the moving air field frame 2, the supply air slide 5 and return air slide 6 can be pulled to extend and retract, ensuring that the protective gas supply pipeline inside the 3D printing equipment will not be damaged, nor will it interfere with other mechanisms.

[0028] One end of the supply air slide pipe 5 and the return air slide pipe 6 are respectively connected to the supply air main pipe 3 and the return air main pipe 4 in a sealed plug-in manner that allows them to slide relative to each other. The supply air slide pipe 5 and the return air slide pipe 6 are connected to the supply air main pipe 3 and the return air main pipe 4 in a dynamic sealed sliding plug-in manner, so that the two slide relative to each other to adapt to the positional changes of the supply air main pipe 3 and the return air main pipe 4 as the moving wind field frame 2 moves.

[0029] The 3D printing equipment's forming chamber 11 forms a forming space 17. A movable airflow frame 2 is installed on the inner wall of the forming chamber 11, and a laser galvanometer system 1 is fixedly installed on the top of the forming chamber 11. The laser emitted by the laser galvanometer system 1 can scan the powder field within the grid 7 of the movable airflow frame 2. This structure is suitable for situations where the scanning area is not particularly large, and when the laser galvanometer system 1 is normally arranged on the top surface of the forming chamber 11, the movable airflow frame 2 can divide the entire forming chamber 11 into airflow zones.

[0030] The forming chamber 11 of the 3D printing equipment is equipped with a movable box 12 capable of horizontal movement along the X-direction and a box drive device that drives the movable box 12 to move horizontally intermittently. The movable box 12 and the powder field plane together form a movable forming space 17. The movable air field frame 2 is installed on the inner wall of the movable box 12, and the laser galvanometer system 1 is fixedly installed on the upper end of the movable box 12. The laser emitted by the laser galvanometer system 1 can scan the powder field within the grid 7 of the movable air field frame 2 through the transparent top plate of the movable box 12. When the total scanning area in the forming chamber 11 is too large for the laser galvanometer system 1 to be properly arranged on the top surface of the forming chamber 11, the movable box 12 is used to divide the forming chamber 11 into multiple forming spaces 17. The laser galvanometer system 1 is installed on the movable box 12. The laser galvanometer system 1 scans one column of powder field directly opposite the movable box 12 at a time. After completion, the movable box 12 moves one column to the right and begins scanning the next column. During scanning, the moving box 12 remains stationary, forming a column-based, sequential displacement, and stationary scanning method that enables scanning of ultra-large areas. It can also be scanned using a small number of laser galvanometer systems 1. The moving box 12 can be made as wide as possible, and a moving wind field frame 2 can be installed inside it. After the moving box 12 moves to a column position, a scan is performed first, and then the moving wind field frame 2 is misaligned before another scan is performed. In this way, the number of times the moving box 12 moves can be greatly reduced, and the stability of the wind field inside can be ensured. This scheme can achieve large-area, efficient, and high-quality scanning.

[0031] The movable housing 12 is further equipped with precision grating measuring devices on both side walls in the Y direction. These devices measure the X displacement of the movable housing 12 along the Y-direction side walls. Based on the measurement data, the precision grating measuring devices perform closed-loop calculations to correct the difference between the current scanning zero point and the previous layer's zero point, ensuring that the current scanning zero point coincides with the previous layer's zero point. Before scanning, the difference between the current and previous layers is corrected using high-precision grating detection, ensuring that the current layer does not misalign with the previous layer. This guarantees that the shape and dimensions of the molded part remain unchanged.

[0032] The mobile wind farm frame 2 is equipped with a guide rail 13 extending along the X direction. The frame driving device includes a first motor, a first reducer, and a first camshaft 14. The first camshaft 14 is rotatably mounted on the side wall of the forming space 17 along the Y direction. A first cam is coaxially fixedly connected to the outer circumferential side wall of the first camshaft 14. The rotation of the first cam can drive the guide rail 13 to move along the X direction. The first motor drives the first camshaft 14 to rotate forward and backward through the first reducer. By rotating the first camshaft 14, the first cam drives the mobile wind farm frame 2 to move a certain distance along the X direction to reposition the frame's obstructed parts, thus providing a supplementary function. This driving structure is simple, occupies little space, has a fast response speed, and is accurate in positioning.

[0033] The forming space also has an adjustment groove 15 extending vertically along the Y-direction sidewall. A second camshaft 16 is slidably inserted into the adjustment groove 15, and a second cam is coaxially fixedly connected to the second camshaft 16. The rotation of the second cam can drive the guide rail 13 to move vertically. A second motor and a second reducer are also provided. The second motor drives the second camshaft 16 to rotate forward and backward through the second reducer. The rotation of the second camshaft 16 causes the second cam to drive the moving air field frame 2 to move a certain distance vertically, realizing the height adjustment function of the moving air field frame 2, thereby adjusting the height of the air outlet 8 and the air inlet 9, ensuring that all smoke and dust are sucked away during scanning, achieving fine scanning.

Claims

1. A grid compensation scanning system, characterized in that: The system includes a laser galvanometer system (1), a mobile air field frame (2), a frame drive device, an air supply duct (3), a return air duct (4), an air supply slide pipe (5), a return air slide pipe (6), and a protective air circulation system. The X and Y directions are defined as two mutually perpendicular directions on a horizontal plane. The mobile air field frame is installed within the forming space (17) of the 3D printing equipment and can move horizontally along the X direction. The frame drive device drives the mobile air field frame to move intermittently horizontally back and forth. The mobile air field frame is a grid structure, containing several grids (7) spaced apart along the X direction. Several sets of laser galvanometer systems are arranged along the X direction. Each set of laser galvanometer systems... It can scan the powder field within a grid of the mobile wind field frame. Each grid of the mobile wind field frame has several air inlets (8) on one side wall and several air inlets (9) on the other side wall. The outer side wall of the mobile wind field frame is also provided with a main air supply pipe and a main air return pipe. Each air inlet is connected to the main air supply pipe and each air inlet is connected to the main air return pipe. The main air supply pipe is connected to one end of an adjustable length air supply slide pipe and the main air return pipe is connected to one end of an adjustable length air return slide pipe. The other ends of the air supply slide pipe and the air return slide pipe are connected to the air return port and the air supply port of the protective air circulation system, respectively.

2. The grid compensation scanning system as described in claim 1, characterized in that: Each cell of the mobile wind farm frame has at least one air supply channel extending along the Y direction on one side wall, and at least one return air channel extending along the Y direction on the other side wall. The air outlet is located on the side wall of the air supply channel, and the air inlet is located on the side wall of the return air channel. The air supply channel and the return air channel are respectively connected to the main air supply pipe and the main air return pipe. The multiple air supply channels and the multiple return air channels are arranged at intervals in the vertical direction.

3. The grid compensation scanning system as described in claim 2, characterized in that: Both the main air supply pipe and the main air return pipe extend along the X direction, and the main air supply pipe and the main air return pipe are located on the two side walls of the mobile wind farm frame along the Y direction, respectively. The air supply channel and the air return channel are respectively connected to the side walls of the main air supply pipe and the main air return pipe perpendicularly through pipe joints (10).

4. The grid compensation scanning system as described in claim 1, characterized in that: The air supply slide pipe and the return air slide pipe are telescopic pipes whose length can be flexibly extended and retracted.

5. The grid compensation scanning system as described in claim 1, characterized in that: One end of the air supply slide pipe and the return air slide pipe are respectively connected to the air supply main pipe and the return air main pipe in a sealed plug-in manner that allows them to slide relative to each other.

6. The grid compensation scanning system as described in claim 1, characterized in that: The forming chamber (11) of the 3D printing equipment forms a forming space. The moving air field frame is installed on the inner side wall of the forming chamber, and the laser galvanometer system is fixedly installed on the top of the forming chamber. The laser emitted by the laser galvanometer system can scan the powder field in the grid of the moving air field frame.

7. The grid compensation scanning system as described in claim 1, characterized in that: The forming chamber of the 3D printing equipment is equipped with a movable box (12) that can move horizontally along the X direction and a box driving device that drives the movable box to move horizontally intermittently. The movable box and the powder field plane together form a movable forming space. The movable air field frame is installed on the inner side wall of the movable box. The laser galvanometer system is fixedly installed on the upper end of the movable box. The laser emitted by the laser galvanometer system can scan the powder field in the grid of the movable air field frame through the transparent top plate of the movable box.

8. The grid compensation scanning system as described in claim 7, characterized in that: The movable box is also equipped with a precision grating measurement device on both sides of the Y direction. The precision grating measurement device can measure the X displacement of the movable box along the two sides of the Y direction. The precision grating measurement device can perform closed-loop calculation based on the measurement data and then correct the difference between the current scanning zero point and the previous scanning zero point, so that the current scanning zero point coincides with the previous scanning zero point.

9. The grid compensation scanning system as described in claim 6 or 7, characterized in that: The mobile wind farm frame is provided with a guide rail (13) extending in the X direction. The frame driving device includes a first motor, a first reducer and a first camshaft (14). The first camshaft is rotatably mounted on the side wall of the forming space along the Y direction. A first cam is coaxially fixedly connected to the outer side wall of the first camshaft. The rotation of the first cam can drive the guide rail to move in the X direction. The first motor drives the first camshaft to rotate in both directions through the first reducer.

10. The grid compensation scanning system as described in claim 9, characterized in that: The forming space is also provided with an adjustment groove (15) extending vertically along the Y direction on the side wall. A second camshaft (16) is inserted into the adjustment groove and can slide vertically. A second cam is coaxially fixedly connected to the second camshaft. The rotation of the second cam can drive the guide rail to move vertically. A second motor and a second reducer are also provided. The second motor drives the second camshaft to rotate forward and backward through the second reducer.

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