JPS5845003Y2 - Steel pipe external grinding equipment - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a steel pipe external surface grinding device.

In the steel pipe heat treatment process, it is extremely important to control the heating temperature of the steel pipe with high precision in order to obtain a stable finished product.

However, since the heating temperature of steel pipes is measured by a radiation thermometer, if there is rust such as scale or black crust on the surface of the steel pipe, the temperature measured by the radiation thermometer will be different from the actual temperature of the steel pipe. .

Conventionally, in order to eliminate the above problem, the rust on the surface of the steel pipe was removed by grinding with a grinder.

However, when the surface is cleaned with a sand grinder, the surface roughness and depth become inconsistent, which adversely affects product quality and reduces efficiency.

This invention was made in order to solve the above problems, and the electric grinding wheel is mounted so that it can be tilted freely.
By configuring the grinding wheel so that it contacts the outer surface of the steel pipe with a constant pressing force even if the diameter of the steel pipe changes, the same device can efficiently grind the outer surface of the steel pipe with a constant surface roughness regardless of the pipe diameter. It is characterized by being able to grind.

This invention will be explained with reference to examples and drawings.

FIG. 1 is a front view of a steel pipe external surface grinding device according to an embodiment of the invention, and FIG. 2 is a plan view of the same device.

In the drawings, 1 is a main body frame.

The base end of this roller is pivoted on a base 2, and is tiltable by a cylinder which will be described later, and a pair of guide rollers 3 are attached to the upper end.

The guide rollers 3 are installed at wider intervals than the grinding wheels described later, and can be freely adjusted forward and backward in 4 directions of the steel pipe to be ground by means of a handle 5.

This ensures that even if the diameter of the steel pipe 4 to be ground changes and the tilt angle of the grinding wheel changes, the grinding wheel is always brought into contact with the outside of the steel pipe 4 to be ground with a constant pressing force via the tension spring described later. It is for.

Reference numeral 6 denotes a grinding wheel mounting arm, whose base end is pivoted to the lower end of the main body frame 1, and is adapted to tilt toward the steel pipe 4 to be ground.

A tension spring 7 is attached between the upper end of the grinding wheel attachment arm 6 and the main body frame 1.

The tension spring 7 has the following function.

That is, when the main body frame 1 tilts, the grinding wheel mounting arm 6 also tilts, and the grinding wheel comes into contact with the outer surface of the steel pipe 4 to be ground, but this contact pressure increases as the tilting angle of the grinding wheel increases. Therefore, it acts to reduce this.

That is, when the tilting angle becomes large and the contact pressing force of the grinding wheel becomes large, the guide roller 3 is extended forward by a predetermined distance by rotating the handle 5.

As a result, the grinding wheel mounting arm 6 is pulled as much as the guide roller 3 moves forward by the tension spring 7, and the positional relationship between the guide roller 3 and the grinding wheel can be maintained in a normal state.

Therefore, the pressing force of the grinding wheel can be kept constant regardless of the tilt angle, and grinding can be performed to an appropriate depth.

81 is a grinding wheel, which is located between the guide rollers 3 of the main body frame 1 and rotated by an electric motor 9 provided on the grinding wheel mounting arm 6.

If a grinding wheel is used as the grinding wheel 8, as shown in FIG. 3, if it is recessed inward in an arc shape according to the curvature of the steel pipe 4 to be ground, it will not touch the outer surface of the steel pipe 4 to be ground. The contact area becomes larger and the grinding efficiency is improved.

In addition, as shown in FIG. 4, when the belt sander 11 is used on the grinding wheel 8, the belt sander 11 is wound around the core material 13 via the cushioning material 12, and the steel pipe to be ground is
It is preferable that the belt sander 11 is brought into close contact with the outer surface of the belt sander 11.

10 is a cylinder for tilting the main body frame 1.

A stopper 14 is installed between the base of the cylinder 10 and the main frame 1, and prevents the main frame 1 from tilting beyond a certain angle.

Since the steel pipe external surface grinding device of this embodiment is configured as described above, in order to grind the external surface of the large-diameter steel pipe 4 to be ground (indicated by the dashed line in the figure), first, the guide rollers 3 are adjusted appropriately. Then, the cylinder 10 is operated to tilt the guide roller 3 until it comes into contact with the outer surface of the steel pipe 4 to be ground.

Along with this, the grinding wheel mounting arm 6 also tilts toward the steel tube to be ground 4, and the grinding wheel 8 comes into contact with the outer surface of the steel tube to be ground 4 with a predetermined pressing force.

Thereafter, by activating the electric motor 9 and rotating the grinding wheel 8, rust and the like existing on the outer surface of the steel pipe 4 to be ground are removed by grinding.

(See Figure 5) On the other hand, to grind the outer surface of another small-diameter steel pipe 4' (indicated by the two-dot chain line in the figure), the procedure is the same as for the large-diameter case described above, but the grinding Before this, it is necessary to turn the wheel 5 to extend the guide roll 3 so that the contact pressing force of the grinding wheel 8 against the outer surface of the steel pipe 4' to be ground does not increase even if the tilting angle becomes large.

(Refer to Fig. 6) In this case, if the grinding wheel 8 is a grinding wheel with an inwardly recessed arc shape as shown in Fig. 3, the curvature of the small-diameter steel pipe 4' At the same time, it is necessary to change to another whetstone with a recessed grinding surface.

However, when a belt sander 11 as shown in FIG. 4 is used as the grinding wheel 8, the belt sander 11 bends inward according to the curvature due to the action of the cushioning material 12, so it is especially difficult to replace the belt sander 11. I don't have to do it.

As explained above, according to this invention, the electric grinding wheel is mounted so as to be tiltable, and the grinding wheel is configured to contact the outer surface of the steel pipe to be ground with a constant pressing force even if the diameter of the steel pipe to be ground changes. This brings about the extremely useful effect of efficiently grinding the outer surface of a steel pipe with a constant surface roughness using the same device regardless of the pipe diameter.

[Brief explanation of drawings]

FIG. 1 is a front view of a steel pipe external surface grinding device according to an embodiment of this invention, FIG. 2 is a plan view of the device, and FIGS. 3 and 4 are sectional views of a grinding wheel used in the device. 5 and 6 are front views showing how the device is used. In the drawings, 1...main frame, 2...base,
3... Guide roller, 4, 4'... Steel pipe to be ground, 5.
...Bundle, 6...Grinding wheel mounting frame, 7...
Tension spring, 8... Grinding wheel, 9... Electric motor, 10.
...Cylinder, 11...Belt sander, 12...
Cushion material, 13... Heart material, 14. Stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] A main body frame whose base end is pivoted and a pair of guide rollers that come into contact with the outer surface of the steel pipe to be ground are attached to the upper end so that they can be adjusted forward and backward at an increased interval, and a grinding wheel mounting arm whose base end is pivoted to the lower end of the main body frame so as to tilt toward the grinding steel pipe side, and a grinding wheel mounting arm having a tension spring attached between the upper end and the main body frame; so that it is located between the guide rollers of
A steel pipe external surface grinding device comprising: a grinding wheel that is attached to the grinding wheel mounting arm and rotated by an electric motor; and a cylinder that tilts the main body frame.