How to adjust the square of the square tube machine in the used square tube machines is to check whether the square tube square is qualified through correct measurement and judgment.

Before adjusting the square tube square of the used square tube machines, let's talk about the square tube square measurement.

The prerequisite for adjusting the square tube is correct measurement and judgment. There are three methods for detecting the square of the square tube:

(1) The diagonal method. Make the diagonals equal, but as described in the Rectangular Tube Adjustment-Diagonal section, the confidence of diagonal measurement is not high due to the actual size of the r angle and the measurement position.

(2) Square measurement method. Place one side of the square against the tube surface and move it up and down until the other side touches any point on the tube surface to check for light leakage. However, this measurement method has a prerequisite, that is, the measurement surface must be flat, emphasizing rather concave than convex.

(3) "Twin Inspection Method". When you don’t have a square on hand, you can cut two sections of pipe heads from the same rectangular tube. After cleaning the end burrs, place them on the platform facing each other or opposite (marked by the weld seam), and then slowly approach them. The position behind the gap determines the square of the tube.

Three methods are used to detect whether the square tube made by the used square tube machines is square, which is mainly reflected in the diagonal method, the square measurement method, and the twin inspection method.