Large 3D printer

Abstract

The invention discloses a large 3D printer. A working table plate is horizontally fixed to the inner side of a rack. A machining through hole is formed in the working table plate; the forming cylinder comprises a telescopic cover, a bottom plate, a lifting mechanism and a guide mechanism; the telescopic cover is a telescopic barrel, and the edge of the top end of the telescopic cover is fixedly connected with the edge below the machining through hole in a sealed mode; the edge of the bottom plate is hermetically and fixedly connected with the edge of the bottom end of the telescopic cover; the lifting mechanism is mounted on the inner side of the rack and is used for driving the bottom plate to lift up and down; the guide mechanism is located on the outer side of the telescopic cover, connected between the bottom face of the working table plate and the edge of the bottom plate and used for guiding lifting of the bottom plate. Through the telescopic design of the forming cylinder barrel, the size of the forming cylinder in the height direction can be greatly reduced, the overall height of equipment can be reduced, and operation is convenient; a piston and a piston seal are canceled, a movable seal for piston movement is avoided, and the hidden danger of powder leakage is avoided; the overall weight of the forming cylinder system is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, and more specifically relates to a large-scale 3D printer. Background technique [0002] 3D printers using laser powder sintering or jet printing usually have a molding cylinder, uniformly spread a layer of powder on the upper surface of the molding cylinder piston, perform laser selective sintering or jetting binder curing bonding, and then drop a layer thickness, Continue to carry out laser selective sintering or spraying adhesive to solidify and bond, so that the parts are processed and manufactured. The molding cylinder used is usually a cylinder, and a piston that can move up and down is installed in the cylinder, and a guide rail and a screw are installed under the piston. , Motor transmission mechanism, the motor drives the screw to drive the piston movement, there is a seal between the piston and the cylinder to prevent powder leakage, as the workpiece is gradually enlarged...

AI Technical Summary

Problems solved by technology

[0002] 3D printers using laser powder sintering or jet printing usually have a molding cylinder, uniformly spread a layer of powder on the upper surface of the molding cylinder piston, perform laser selective sintering or jetting binder curing bonding, and then drop a layer thickness, Continue to carry out laser selective sintering or spraying adhesive to solidify and bond, so that the parts are processed and manufactured. The molding cylinder used is usually a cylinder, and a piston that can move up and down is installed in the cylinder, and a guide rail and a screw are installed under the piston. , Motor transmission mechanism, the motor drives the screw to drive the piston movement, there is a seal between the piston and the cylinder to prevent powder leakage, as the workpiece is gradually enlarged, the length, width and height of the forming cylinder are gradually increased, Because there is a transmission mechanism under the forming cylinder, the worktable is very high, the equipment is very high, and the operation is inconvenient. In order to solve this problem, the transmission mechanism such as the screw is arranged on the outside of the cylinder. The vertical groove of the beam passes through the long groove to connect with the piston, and the long groove on the side wall of the cylinder is sealed by a sealing tape and a sealing mechanism, but the sealing structure is complicated and the reliability is low. After a long running time, the sealing steel belt will be damaged and elongated. , the powder will leak, and maintenance is also very troublesome

At the same time, in the manufacture of large-scale 3D printers, the length and width of the forming cylinder will be several meters, the forming cylinder will be heavy and large, the processing and manufacturing are cumbersome, and there are often problems with the sealing of the piston and the cylinder, resulting in powder leakage

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