A flatness detection method

Abstract

The invention discloses a method for flatness detection, which comprises the following steps: setting four kinds of left and right inclinations and front and rear inclinations of connecting lines corresponding to different positions on the periphery of the surface to be measured of the object to be measured, which are inclined back and forth and left and right. Labeling points; according to the straight-line distance measured between every two corresponding labeling points and the left and right inclination angles or front and rear inclination angles of the surface to be measured, the theoretical height difference between every two corresponding labeling points is obtained; according to Measure the height of each marked point on the same benchmark, and calculate the actual height difference between each two corresponding marked points; according to the difference between the theoretical height difference and the actual height difference between each two corresponding marked points The judgment result of whether they are all within the preset error range is the detection result of the flatness of the surface to be measured. The invention can detect whether the flatness of the flange surface of the rudder propeller flange inclined in two directions meets the installation requirements.

Description

technical field [0001] The invention relates to the technical field of precision measurement, in particular to a flatness detection method. Background technique [0002] The power system of some existing offshore engineering vessels is an azimuth motor propulsion system, please refer to figure 1 , that is, a full-turn rudder and propeller device 1 will be respectively installed on the port side and the starboard side of the offshore engineering vessel. Wherein, the full-turn rudder paddle device 1 is divided into two parts, one part is installed in the installation part 10 of the ship, and the other part is the rudder paddle propulsion part 11 arranged on the bottom outside the ship. When the installation part 10 of the full-turn rudder-propeller device 1 can be firmly and accurately installed at a predetermined position in the ship, the rudder propulsion part of the full-turn rudder-propeller device can be accurately installed. Specifically, the installation method of the...

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Problems solved by technology

[0003] But because the existing rudder paddle flange 2 is installed in the ship, it can tilt forward, backward, left, and right. Specifically, the rudder paddle flange 2 can incline at a certain angle from the stern of the ship to the bow of the ship (i.e. in the case of forward and backward tilting). One type), and will tilt at a certain angle from the side of the ship to the middle of the ship (that is, one of the left and right tilt situations)

Because the existing method for measuring flatness can only detect whether the flatness of the flange surface of the rudder propeller flange 2 that is tilted in one direction (that is, tilted forward and backward or tilted left and right) meets the installation requirements, it cannot detect whether the flatness of the flange surface of the rudder paddle flange 2 is in line with the installation requirements Whether the flatness of the flange surface of the rudder propeller flange 2 that is tilted at the same time in all directions (that is, tilted forward and backward and left and right at the same time) meets the installation requirements, which will affect the accurate installation of the subsequent full-turn rudder propeller device 1

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