CN-122008549-A - Height compensation method and system for printing equipment

CN122008549ACN 122008549 ACN122008549 ACN 122008549ACN-122008549-A

Abstract

The application provides a height compensation method and a system of printing equipment, and relates to the technical field of printing. The method comprises the steps of determining a reference height corresponding to a preset measurement reference surface, controlling printing nozzles in the multi-nozzle 3D printing equipment to sequentially move to be right above the measurement reference surface and touch the measurement reference surface, determining a height value when the printing nozzles touch the measurement reference surface, measuring actual height deviation of each printing nozzle based on a triggering signal when the printing nozzles touch the measurement reference surface, and performing height compensation on the printing nozzles in the Z axis direction based on a compensation height corresponding to the printing nozzles in the Z axis direction, so that full-automatic leveling and first layer optimization without manual intervention are realized, uniformity, adhesive force and flatness of a first layer are guaranteed, the printing success rate and equipment intelligence level are greatly improved, and the problems of uneven first layer, low success rate and the like in traditional multi-head printing are solved.

Inventors

LI QIANG
SHENG QIHAO
ZHENG XIAOMING

Assignees

深圳闪铸三维科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251212

Claims (10)

1. A height compensation method of a printing apparatus, which is applied to a 3D printing apparatus to be compensated in a height compensation system including a second sensor assembly mounted to a printing platform or a printing platform periphery of the 3D printing apparatus, and the 3D printing apparatus, the method comprising: determining a reference height corresponding to a preset measurement reference surface, wherein the measurement reference surface is a sensing surface of the second sensor assembly; controlling a printing nozzle in the 3D printing equipment to move to be right above the measurement reference surface and touch the measurement reference surface, and determining a height value when the printing nozzle touches the measurement reference surface; determining a compensation height corresponding to the printing nozzle in the Z-axis direction based on the height value when the printing nozzle touches the measurement reference surface and the reference height; And carrying out height compensation on the printing spray head in the Z-axis direction according to the compensation height corresponding to the printing spray head in the Z-axis direction.
2. The method of claim 1, wherein the height compensation system comprises a first sensor assembly mounted on a head mount assembly of the 3D printing device.
3. The method of claim 2, wherein determining the reference height corresponding to the measurement reference plane comprises: Controlling the spray head seat assembly to drive the first sensor assembly to move to a zero position preset on the printing platform, and determining the zero plane height corresponding to the zero position based on a trigger signal of the first sensor assembly; Controlling the spray head seat assembly to drive the first sensor assembly to move to a position right above the sensing surface of the second sensor assembly and touch the sensing surface, and determining a first height value corresponding to the sensing surface based on a trigger signal of the second sensor assembly when the first sensor assembly touches the sensing surface; And determining a first difference value between the first height value and the zero plane height, and taking the first difference value as a reference height corresponding to the measurement reference plane.
4. The method of claim 2, wherein the 3D printing device is a multi-head 3D printing device, the multi-head 3D printing device having a plurality of printing heads, the controlling the printing heads in the 3D printing device to move directly above and to touch the measurement datum, and determining a height value at which the printing heads touch the measurement datum, comprising: after a first printing nozzle in the multi-nozzle 3D printing equipment is replaced to the nozzle seat assembly, the nozzle seat assembly is controlled to drive the first printing nozzle to move to the position right above the sensing surface of the second sensor assembly and touch the sensing surface, and the height value when the first printing nozzle touches the measurement reference surface is determined based on the trigger signal of the second sensor assembly when the first printing nozzle touches the sensing surface, and the operation is repeated for a plurality of times until the height value when each printing nozzle touches the measurement reference surface is determined.
5. The method of claim 4, wherein determining the height value of the print head touching the measurement datum based on the trigger signal of the second sensor assembly when the first print head touches the sensing surface comprises: Acquiring the moving speed of the nozzle seat component when the first printing nozzle does not touch the sensing surface; determining a signal trigger time difference for the second sensor assembly; determining response overshoot according to the moving speed of the nozzle seat assembly and the signal trigger time difference, wherein the response overshoot is used for representing the running displacement of the first printing nozzle after the first printing nozzle actually touches the sensing surface; And correcting the height value when the printing spray head touches the measurement reference surface by using the response overshoot, so as to obtain the actual height value when the printing spray head touches the measurement reference surface.
6. The method of claim 5, wherein said determining a signal trigger time difference for the second sensor assembly comprises: when the first printing nozzle does not touch the sensing surface, acquiring a reference signal output by the second sensor assembly, and setting a trigger threshold; determining a host control movement stop time when the variation of the output signal of the second sensor assembly exceeds the trigger threshold, and determining a peak time when the variation of the output signal of the second sensor assembly reaches a maximum offset peak; and determining the signal trigger time difference of the second sensor component according to the peak time and the host control motion stop time.
7. The method of claim 1, wherein determining the compensated height of the print head in the Z-axis direction based on the height value of the print head when the print head touches the measurement reference surface and the reference height comprises: And determining a second difference value between the height value of the printing nozzle when the printing nozzle touches the measuring reference surface and the reference height, and taking the second difference value as a compensation height of the printing nozzle corresponding to the Z-axis direction.
8. A height compensation system of a printing device, comprising a first sensor assembly, a second sensor assembly and a multi-jet 3D printing device to be compensated, wherein the first sensor assembly and the second sensor assembly are in communication connection with the multi-jet 3D printing device; the first sensor assembly is mounted on a sprayer seat assembly of the multi-sprayer 3D printing device, and the second sensor assembly is mounted on a printing platform or the periphery of the printing platform of the multi-sprayer 3D printing device; the multi-jet 3D printing apparatus for performing the height compensation method steps of the printing apparatus of any one of the preceding claims 1 to 7.
9. The system of claim 8, wherein a sensor mount is provided at a bottom of the showerhead holder assembly, the first sensor assembly being mounted to the sensor mount with a first mount; the second sensor assembly is mounted to the print platform using a second mount.
10. The system of claim 9, wherein the second sensor assembly comprises an impact bar, an elastomer, a vortex coil, an upper shell and a lower shell, the top surface of the impact bar being a sensing surface; the collision rod is in a cylindrical or concave bowl-shaped structure; the middle part of the elastic body is in a groove shape, the upper end of the elastic body is connected with the upper shell, the bottom of the elastic body is connected with the collision rod, and the bottom surface of the elastic body is opposite to the vortex coil; The eddy current coil is fixedly adhered to the top inner surface of the lower shell, and the upper shell and the lower shell are connected with each other and jointly form an external packaging structure; One end of the second fixing piece is detachably connected with the lower shell, and the other end of the fixing piece is detachably connected with the printing platform, so that the lower shell is fixed and clung to the printing platform.

Description

Height compensation method and system for printing equipment Technical Field The application relates to the technical field of printing equipment, in particular to a height compensation method and a system of the printing equipment. Background In the technical field of 3D printing, a multi-nozzle 3D printing device is generally provided with two or more printing nozzles which are independently controlled and used for realizing multi-material, multi-color or high-speed parallel printing, so that consumable waste can be effectively reduced, printing time can be saved, and printing efficiency can be improved. However, due to mechanical assembly errors, structural deformation caused by long-term operation, thermal expansion effects, platform warpage and other factors, the relative heights between different printing nozzles and printing platforms often deviate, and if accurate measurement and calibration are not performed, problems such as nozzle scraping platforms, uneven material extrusion, uncontrolled layer thickness, printing failure and the like are extremely easy to occur. At present, the common printing platform height measurement method adopts a laser triangulation method or a confocal optical sensor to perform height scanning, can acquire three-dimensional morphology data with higher precision, and supports dynamic leveling and inclination compensation. However, the measurement mode has complex system integration, and signal drift or measurement distortion is easy to generate on a transparent or highly reflective platform, so that the application of the measurement mode in the popular multi-nozzle 3D printing equipment is limited. Disclosure of Invention The present application aims to solve the above-mentioned drawbacks of the prior art, and provides a height compensation method and system for a printing device, so as to solve the technical problems in the prior art. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows: In a first aspect, an embodiment of the present application provides a height compensation method of a printing apparatus, applied to a 3D printing apparatus to be compensated in a height compensation system, the height compensation system including a first sensor assembly, a second sensor assembly, and the 3D printing apparatus, the first sensor assembly being mounted on a head mount assembly of the 3D printing apparatus, the second sensor assembly being mounted on a printing platform or a periphery of the printing platform of the 3D printing apparatus, the method including: determining a reference height corresponding to a preset measurement reference surface, wherein the measurement reference surface is a sensing surface of the second sensor assembly; Controlling a printing spray head in the 3D printing equipment to sequentially move to be right above the measurement reference surface and touch the measurement reference surface, and determining a height value when the printing spray head touches the measurement reference surface; determining a compensation height corresponding to the printing nozzle in the Z-axis direction based on the height value when the printing nozzle touches the measurement reference surface and the reference height; And carrying out height compensation on the printing spray head in the Z-axis direction according to the compensation height corresponding to the printing spray head in the Z-axis direction. Optionally, the height compensation system includes a first sensor assembly mounted on a head mount assembly of the 3D printing apparatus. Optionally, the determining the reference height corresponding to the measurement reference plane includes: Controlling the spray head seat assembly to drive the first sensor assembly to move to a zero position preset on the printing platform, and determining the zero plane height corresponding to the zero position based on a trigger signal of the first sensor assembly; Controlling the spray head seat assembly to drive the first sensor assembly to move to a position right above the sensing surface of the second sensor assembly and touch the sensing surface, and determining a first height value corresponding to the sensing surface based on a trigger signal of the second sensor assembly when the first sensor assembly touches the sensing surface; And determining a first difference value between the first height value and the zero plane height, and taking the first difference value as a reference height corresponding to the measurement reference plane. Optionally, the 3D printing device is a multi-nozzle 3D printing device, the multi-nozzle 3D printing device has a plurality of printing nozzles, the controlling the printing nozzles in the 3D printing device to sequentially move to right above the measurement reference surface and touch the measurement reference surface, and determining a height value when the printing nozzles touch the measurement reference surfa