Structured light three-dimensional measurement device and complete point cloud data acquisition method thereof

Abstract

The invention discloses a structured light three-dimensional measurement device and a complete point cloud data acquisition method thereof. The structured light three-dimensional measurement device comprises a four-dimensional degree of freedom workbench, a guide rail vertical to the four-dimensional degree of freedom workbench, a structured light measuring head, a movable arm arranged on the guide rail, a computer and a controller, wherein the structured light measuring head is installed on the movable arm which is connected with the guide rail in a sliding way, the guide rail is provided with a first motor which drives the movable arm to move up and down, the four-dimensional degree of freedom workbench comprises a two-dimensional workbench and a clamping workbench, the clamping workbench is arranged at the upper part of the two-dimensional workbench and is provided with at least four clamping structures, each clamping structure comprises a roller and a second motor driving the roller to rotate, the four-dimensional degree of freedom workbench, the first motor and the second motor are all connected with the controller electrically, the structured light measuring head is connected with the computer electrically, and the computer is connected with the controller electrically. By adopting the structured light three-dimensional measurement device and the complete point cloud data acquisition method thereof, the complete point cloud data of a product with a complicated profile can be acquired automatically and the measurement efficiency is high.

Description

Technical field: [0001] The invention relates to the field of three-dimensional measuring devices, in particular to a structured light three-dimensional measuring device and a method for obtaining complete point cloud data. Background technique: [0002] With the rapid development of industrial manufacturing fields such as automobiles and home appliances and the increasing requirements of consumers for product aesthetics, complex profiles composed of free-form surfaces and parametric surfaces are used in automotive lights, interior and exterior trim parts and home appliances. The proportion is getting higher and higher. The rapid product development system based on reverse engineering is more and more used in enterprise product design. Whether it is the development or testing of products with complex shapes, the acquisition of point cloud data becomes the basis for product development and testing. Accurate and efficient acquisition of complete Product point cloud data has a...

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Problems solved by technology

[0004] Three-coordinate measuring machine belongs to contact measurement, which is characterized by high measurement accuracy. It is suitable for parts that do not have complex internal cavity, many geometric feature sizes, and only a small number of characteristic surfaces. The three-coordinate measuring machine has a slow measurement speed and is easy to damage the probe. Or scratch the surface of the measured entity, it is also necessary to perform probe radius compensation on the measurement data, which also has certain requirements for the use environment, especially for parts with complex internal cavities, because the probe cannot penetrate into the complex internal cavity, so this cannot be obtained. In addition, the contact three-coordinate measuring machine is not suitable for measuring the surface of flexible material products, because when the probe touches the surface of the object to be measured, the surface shape of the object will be changed

The laser 3D measurement equipment developed by a company in Taiwan adopts the method of rotating the worktable to obtain a complete point cloud, which also cannot overcome the lack of point cloud data.

[0006] It can be seen that, in the 3D measurement process of the above prior art, the acquisition methods of point cloud data have the defects of insufficient data integrity and low acquisition effect. Research on better 3D data acquisition methods can improve the 3D accuracy of complex surface products. The reliability and accuracy of measuring equipment, adapting to the all-round measurement of products with different complex shapes, has become an urgent need for the detection and design of geometric quantities of complex shapes

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