JPH0355267B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to butt welding of long steel pipes together, and cleans the surface by removing rust, dirt, oil, oxide film, etc. from the joint ends. The present invention relates to a steel pipe end grinding device used for grinding the inner and outer circumferential surfaces, end faces, and inner and outer corner surfaces of the end of a steel pipe in order to achieve a sufficiently good weld overlay.

B. Prior art In the past, there were few suitable grinding devices for grinding the joint ends of steel pipes due to the long length of the steel pipes and the poor roundness accuracy of the steel pipes, and in general, a portable grinder was used. The grinding process was performed by the operator directly, but this method not only made it difficult to maintain constant grinding accuracy, but also was inefficient and resulted in severe worker fatigue.

In order to improve the above points, the method shown in Utility Model Application Publication No. 58-11034 has been proposed, but this
It is only possible to grind a U- or V-shaped groove on the outer peripheral surface of a joint of a steel pipe, but it is not possible to grind the inner and outer periphery or end face of a joint of a steel pipe.

Additionally, the present applicant has proposed a device for grinding the joint end of a flat steel plate in Japanese Patent Application No. 1984-62849, but this device is intended for flat steel plates. It could not be applied to steel pipes like the invention.

C. Purpose of the Invention The present invention provides an inner and outer peripheral surface of the end of a rotating steel pipe 1,
This is a device for grinding end faces and inner and outer corners, and one end is supported by a bracket 12 on which a copying roller 16 that guides along the end face of the steel pipe 1 is attached to be movable for fine adjustment in the axial direction of the steel pipe 1. A guide frame 2 that extends in a substantially semicircular arc shape and has semicircular guide grooves 21 and racks 22 along the inner side thereof, and a slide that fits into the guide grooves 21. It is provided with a movable protrusion 23 and a drive pinion 26 which can be reciprocated in forward and backward directions and meshes with the rack 23, and by these engagements, it is supported and driven by this guide frame 2, and by moving along the semicircular arc trajectory of the frame 2. A movable housing 3 whose posture can be sequentially changed over a range of 180 degrees, and a support arm 29 pivotally connected to the movable housing 3, which is swingable in the grinding direction and is elastically supported in a direction in which it is always in pressure contact with the grinding position. The guide frame 2 is provided with a grinding head A projecting toward the steel pipe 1 from the support arm 29, and supports the guide frame 2 so as to be movable and adjustable in the axial and radial directions of the steel pipe 1.

D. Embodiment The drawings show an embodiment of the present invention, and in FIG. 1, 1 is a steel pipe, 2 is a substantially semicircular guide frame, 3 is a movable housing, A is a grinding head portion, and B is a grinding head portion.
is a support means that supports the guide frame 2 so that the guide frame 2 can be moved and adjusted in the axial direction and the radial direction of the steel pipe 1.

The support means B can have any configuration, but in the embodiment shown in the drawings, as shown in FIG. A first sliding body 6 is provided which can move up and down along the steel pipe 1 (that is, in the radial direction of the steel pipe 1), and a screw shaft 8 is screwed into a nut 7 fixed to the first sliding body 6. The first sliding body 6 can be moved up and down by forward and reverse rotation with a forward and reverse motor 9 provided on the gate-shaped column 5, and the second sliding body 10 is attached to the first sliding body 6 in the horizontal direction (i.e., the steel pipe 1 The second sliding body 10 is movable in the horizontal direction with respect to the first sliding body 6 by a forward/reverse motor 11 via a rack and pinion mechanism (not shown). A bracket 12 of the guide frame 2 is supported on the second sliding body 10 so as to be movable in the axial direction of the steel pipe 1 via a guide rod 13 and a guide tube 14, and a regular spring 15 is used to support the bracket 12 of the guide frame 2 on the end face side (first side) of the steel pipe 1. (to the right in the figure).

In addition, in FIG. 1, 16 is the guide frame 2.
This is a copying roller for the end face of a steel pipe 1 attached to a bracket 12. By rotating the handle 17, the copying roller 16 is moved in the axial direction of the steel pipe 1 with respect to the bracket 12 due to the threaded relationship between the screw shaft 18 and the nut 19. Further, as shown in FIG. 2, the contact position can be changed along the slit 21 of the support plate 20 of the copying roller 16 whenever the diameter of the steel pipe 1 changes, and the contact angle can also be changed. It is bolted to the support plate 20 with a single bolt passing through the slit 20' so that it can be changed.

Next, the relationship between the guide frame 2 and the movable housing 3 will be explained in detail with reference to FIGS. 3 and 4.

The guide frame 2 has a substantially U-shaped cross section, and has guide grooves 21, 21 on both inner sides thereof, and racks 22, 22 are provided on the inner sides of the guide grooves 21, 21. ，
22 is provided along the semicircular arc shape of the guide frame 2. Arc-shaped sliding protrusions 23, 23 that slidably fit into the guide grooves 21, 21 are integrally attached to both sides of the movable housing 3. Reverse motor 24
and a shaft 27 of pinions 26, 26 driven by the output gear 25 of this motor 24, and these pinions 26, 26 are connected to the racks 22, 26,
It is engaged with 22. Therefore, the movable housing 3 is supported by the guide frame 2 and is movable along the semicircular arc trajectory of the guide frame 2.

The grinding head A is mounted and supported on the movable housing 3 so as to be able to swing in the grinding direction and to be able to press against the grinding surface at all times.

That is, as shown in FIG. 5, the grinding head part A is supported by a support arm 29 that is supported swingably in the grinding direction by one pivot shaft 28 fixed to the movable housing pair 3. ing.

The support arm 29 can be adjusted to the worm 3 by rotating the fine adjustment handle 30 as shown in FIG.
Worm gear 3 fixed to pivot 28 via 1
2, the worm 31 is supported by a worm housing 33, and the worm 31 is supported by a worm housing 33.
is supported within the support arm 29 so as to be freely movable in the axial direction of the worm 31, and the spring 34
By being pressed in one direction by the support arm 29, the grinding head A is always pressed against the grinding surface.

In this embodiment, the grinding head A includes a contact wheel 35 and a drive pulley 36 at one end of the support arm 29, as shown in FIGS. 5 and 6.
4 tension pulleys 37, 38, 39, 40
are provided, and an endless belt 41 is wrapped around these as shown in the figure. The contact wheel 35 and the drive pulley 36 are rotatably supported on the support arm 29, and the drive pulley 36 is connected to a suitable transmission device from a belt drive motor 42 provided on a part of the support arm 29 (the left end in FIG. 2). A driving force is applied through the tension pulleys 37, 3.
8, 39, and 40 are coaxially supported in pairs, and the supporting body 43 is configured to apply necessary tension to the endless belt 41 via a tension applying mechanism such as a tension spring to the support arm 29. There is. In this case, contact wheel 35
On the other hand, the diameter of the drive pulley 36 is made small,
When grinding the outer surface of the steel pipe 1, the drive pulley 3
6 is arranged so as not to interfere with the outer surface of the steel pipe 1.

Next, to explain the operation, the steel pipe 1 normally
Turning rollers 44, 4 as shown in the figure
4, it is supported horizontally and rotated. When grinding the inner surface of the steel pipe 1, as shown in Fig. 1, the contact foil 35 is placed parallel to the axial direction of the steel pipe 1, and the end face is ground as shown in Fig. 7. Grinding is carried out as shown in Fig. 8, and the other inner corners and outer corners can be ground in an intermediate position between them, and in the end, the grinding is carried out in the 180° range from a to e in Fig. 9. approx.
Grinding is done by changing the posture in 45° increments.

In the above embodiment, the case where the grinding head part A is of an endless belt type is illustrated, but the contact wheel is replaced with a grinding wheel, and this grinding wheel is driven by a motor, and the drive pulley and tension pulley of the above embodiment are used. Furthermore, in place of the grinding wheel, a disk wheel having a cylindrical coated abrasive paper wound and fixed on the outer circumferential surface may be used.

E. Effects of the Invention According to this invention, not only the weld groove surfaces (inner and outer peripheral corner surfaces for improving weld overlay), including the inner and outer peripheral surfaces of the steel pipe end surface joint, but also the steel pipe end surface, By simply changing the posture and position of the grinding head along the semi-circular guide frame, high precision and automatic grinding can be achieved, improving efficiency.Moreover, the equipment is extremely simple and inexpensive; This has the advantage of improving the welding strength of the welds and making it easier to make them uniform.

[Brief explanation of drawings]

FIG. 1 is an elevational view showing one embodiment of the device of the present invention;
Figure 2 is its right side view, Figure 3 is an enlarged view of the guide frame and movable housing in Figure 1, Figure 4 is its cross-sectional plan view, and Figure 5 is the movable housing and grinding in Figure 2. FIG. 6 is an enlarged side view showing the relationship between the support arm and the grinding head, and FIGS. 7 to 9 are explanatory views of the working procedure. DESCRIPTION OF SYMBOLS 1... Steel pipe, 2... Guide frame, 3... Movable housing, A... Grinding head part, 35... Contact foil, 41... Endless belt.

Claims (1)

[Claims] 1 A device for grinding the inner and outer peripheral surfaces, end faces, and inner and outer corners of the end of a rotating steel pipe, in which one end is attached to a bracket that allows fine adjustment movement in the axial direction of the steel pipe with a copying roller that guides it along the end face of the steel pipe. is supported,
A guide frame that extends in a substantially semicircular arc shape facing the inner and outer circumferential surfaces of the steel pipe end, and has a semicircular guide groove and a rack along the inside thereof, and a sliding protrusion that fits into the guide groove. and a reversible drive pinion that meshes with the rack, and when these engage, it is supported and driven by the guide frame, and is sequentially moved over a range of 180 degrees by moving along the semicircular arc trajectory of the frame. A movable casing whose posture can be changed by holding the movable casing, and a support arm pivotally attached to the movable casing, which is movable in the grinding direction and is elastically supported in a direction in which it is always in pressure contact with the grinding position, and the support arm is supported on the steel pipe side with respect to the support arm. 1. A steel pipe end grinding device, comprising a protruding grinding head, and supporting the guide frame so as to be movable and adjustable in the axial direction and radial direction of the steel pipe.