Roll grooving apparatus

Abstract

A rolling grooving machine comprises a grooving roller, a supporting roller, a device supporting the grooving roller and the supporting roller and making the grooving roller and the supporting roller rotate respectively around a first axis and a second axis, and a device making the supporting roller and the grooving roller approach to each other or separate from each other along the radial direction, wherein, the grooving roller is provided with a rolling protuberance extending along the circumferential direction, the supporting roller is provided with an outer surface of a rolling channel extending along the circumferential direction. The invention is characterized in that: the outer surface of the supporting roller comprises gear structures on the inner and outer sides of the channel along the axial direction, according to the relative rotation among the supporting roller, the grooving roller and a tube of an awaiting grooving between the supporting roller and the grooving roller, the gear structures make the supporting roller and the tube of the awaiting grooving push press each other inwards along the axial direction, the gear structure on the inner side of the channel along the axial direction has a first axis direction length, the gear structure on the outer side of the channel along the axial direction has a second axis direction length less than the first axis direction length.

Description

[0001] This application is a divisional application of No. 02141530.7 Chinese invention patent application. technical field [0002] This invention relates to roll grooving machines, and in particular to improvements to such machines to achieve and maintain the desired alignment between the grooving roll and the workpiece, and to achieve and maintain the impression between the grooving roll and the workpiece ( tracking) so that the slots are cut perpendicular to the axis of the workpiece. Background technique [0003] The present invention is particularly suitable for use in conjunction with a portable roll groover which is coupled to a rigidly supported pipe so as to feed around the outer circumference of the pipe during grooving. However, although the invention is disclosed and described in connection with this grooving machine, it should be understood that the invention is applicable to roll grooving machines having the character that the grooving rolls are rigidly suppor...

AI Technical Summary

Problems solved by technology

[0007] While all of the above solutions facilitate indentation self-alignment, they add undesired additional expense to the roll grooving machine by requiring additional and / or specialized design components, thereby increasing manufacturing and maintenance costs

Also, in those machines that use feed screws to move the grooving rolls relative to each other, requiring higher than necessary input torque due to potential jamming, feed screw wear is often a problem

And there is another possible problem that the screw rod will be damaged due to the drop of the slotting machine, which is often encountered in this field

In addition, the force required to groove thick wall pipe, such as the 5 inch pipe wall thickness series Sch.

Therefore, it is currently not possible to roll groove all sizes of pipe, such as pipe in the range of 1.25 to 12 inches, with a single basic groover

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