U Channel Roll Forming Machine For Coal Mine

Technical requirements of u channel steel rolling machine for coal mine:

The newly designed scaffold shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedure.

The chemical composition and mechanical properties of u-shaped steel should comply with GB3414.

The size, shape, weight and allowable deviation of U shape steel are carried out in accordance with the relevant provisions of GB4697, YB (T) 46 and MT143.

Application scope of U channel rolling machine for coal mine:

This standard specifies the manufacturing technical requirements, test methods, and inspection rules of U - shaped steel flexible supports (hereinafter referred to as "supports"). This standard is suitable for arch, horseshoe shape, circular, square ring, long ring, etc.

CZU Purlin Roll Forming Machine

U channel roll forming machine feeding material:

The end face should be perpendicular to the longitudinal center line, and the vertical deviation of the end face should not be greater than 2mm.

In the case of u-shaped steel, the defects caused by the blanking should be removed, such as flying edges, oxides, slag and so on.

After cutting material of u-shaped steel, there is no tearing at the cutting edge. If there is a tear, it should be repaired and polished.

The length of u-shaped steel is allowed to be a deviation of plus or minus 5mm.

Pressing requirements:

After the beam and legs are pressed into shape, the arc should be smooth, and the straight line of the leg should be cut off from the arc phase to avoid the existence of hard transition.

When the beam is pressed into shape, when the beam is in accordance with the two sides of the sample, the top of the beam and the sample error shall not be greater than 6mm; When the top of the beam is in accordance with the sample, the error of both ends and the sample shall not be greater than 4mm.

When the legs are pressed into shape, when the straight leg is in line with the sample, the error of the arc end and the sample should not be greater than 5mm.

After the beam is pressed and formed, transverse cracks are not allowed at both ends of the beam. The length of the longitudinal crack shall not be greater than 80mm, and the crack shall be welded and smoothed.

After the legs are pressed into shape, the arcs of the legs are not allowed to have transverse cracks. The length of the longitudinal crack shall not be greater than 80mm, and the crack shall be welded and smoothed.

After the beam and legs are formed, the length of the straight line segment of the ends of the beam and the arc end of the legs shall not be greater than 120mm for 18 or 25U steel supports, and no more than 80mm for 29 or 36U steel supports.

18. After the legs of the section steel bracket are formed, the maximum distortion shall not be greater than 3mm.

29. The maximum length distortion shall not be greater than 5mm after the shape of the beam leg of the 36U steel bracket.

After the beam and legs are formed, the opening amount of U shaped steel slot shall not be greater than 4 mm.

Cable requirements:

The cable shall be machined according to the design drawing.

Each part of the cable must have good interchangeability, and the bolt should be inserted directly between the two cable plates of the installation state.

Parts that need to be tempered must meet the hardness index.

Welding requirements:

The welding of base plate and column leg should be kept perpendicular, and its vertical deviation should not be greater than 2mm.

The leg can be welded with short material, the position of the weld should be below the arc of the leg, more than 100mm straight line part, the weld should do bending, tensile strength test, its strength must not be lower than raw material strength.

Assembly requirements:

After assembly, the total height and total width should meet the design requirements. The total height error is plus or minus 1% of the bracket size, and the total width error is plus or minus 2% of the bracket size.

After the bracket is assembled, the joint length should meet the design requirements, and the length error of the joint should be plus or minus 5%.

After assembly, the entire plane shall not be greater than 20mm.

Inspection methods

Inspection of dimension tolerance with steel ruler, steel tape or caliper.

The beam and leg arc should be inspected with the sample, and the size error of the sample and design shall not be greater than 0.5mm.

After the scaffold is assembled on a flat plate (or flat), measure the flatness of the two sides with a steel ruler.

The Angle between the column leg and the base surface, and the Angle ruler or sample.

Hardness indicators are checked by hardness tester.

Visual inspection of cracks.

Inspection rules

When the stent is in normal production, all items should be inspected on a regular basis.

Part inspection unqualified should be qualified.

The inspection of finished products was carried out by random sampling method, with each batch of 100 randomly selected one, 101~500 spot check two, and 501 spot check three. If the unqualified is qualified, if the unqualified is redoubled, the unqualified will be judged.

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