Device for grinding pipe joint

Abstract

To provide a grinding device capable of efficiently grinding pipe joints that are not straight pipes such as elbow types.SOLUTION: A device for grinding pipe joints comprises: a placing pedestal part which places an end surface of an opening of a pipe joint and which is rotatably controlled; and a grinding tool which is energized toward an outer peripheral surface or an inner peripheral surface of the opening of a pipe joint. The placing pedestal part has an inclined placing part which is inclined at a prescribed angle.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a grinding device for grinding the vicinity of an open end of a pipe joint. [Background technology]

[0002] 2. Description of the Related Art In the field of piping construction, pipes are connected to each other via pipe joints. In this case, if there is a plating film, a chemical conversion film, or black scale left over from casting near the open end of the pipe joint, welding and joining may be difficult.

[0003] Therefore, the applicant of the present invention has previously proposed a processing device for the end of a tube. Furthermore, the inventors have investigated a simple and versatile structure, which has led to the present invention. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6810646 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a grinding device that can efficiently grind even pipe joints that are not straight pipes, such as elbow joints. [Means for solving the problem]

[0006] The grinding device for pipe fittings according to the present invention comprises a mounting base portion on which the end face of the opening of the pipe fitting is placed and which is controlled to rotate, and a grinding tool which is biased toward the outer or inner peripheral surface of the opening of the pipe fitting, and the base portion has an inclined mounting portion inclined at a predetermined angle.

[0007] In an elbow-type pipe joint, the rise angle of the inner and outer peripheral walls from the end of the inner bent portion is steeply inward. In contrast, the outer bent portion has a gentler rising angle than the inner bent portion. Therefore, when the cutting edge of the grinding tool abuts on the inner peripheral surface or the outer peripheral surface of the pipe joint, the grinding angle differs between the inner bent portion and the outer bent portion of the pipe joint. Therefore, in the present invention, the base portion supporting the open end face of a pipe fitting such as an elbow fitting is inclined so that the contact angle of the grinding tool is as uniform as possible between the inner bent portion and the outer bent portion.

[0008] In the present invention, the rotation axis of the base portion may be disposed eccentrically with respect to the center line of the opening of the pipe joint. In this way, when the base rotates, the cutting edge of the tool that contacts the inner and outer peripheral surfaces of the pipe joint moves in the rising and falling directions according to the amount of eccentricity while grinding.

[0009] In the present invention, the grinding tool is supported by a rotating shaft so that the cutting edge abuts the outer or inner surface of the opening of the pipe fitting by a biasing force, and the rotating shaft can also be positioned offset from the center line of the opening of the pipe fitting. In this way, even if the position of the inner or outer peripheral surface of the pipe joint fluctuates left or right, the amount of fluctuation can be followed, and the contact angle of the cutting edge can be easily changed and adjusted. [Effects of the Invention]

[0010] The present invention can be applied to straight pipe types such as sockets and tee fittings, but even in pipe fittings such as elbow types that do not have a straight pipe structure, the contact angle of the grinding tool can be adjusted according to the rising angle of the inner or outer peripheral surface, allowing for uniform grinding processing. [Brief explanation of the drawings]

[0011] [Figure 1] An example of an apparatus for grinding the outer surface of a pipe joint is shown below. [Figure 2]An example of an apparatus for grinding the inner peripheral surface of a pipe joint is shown. [Figure 3] 1 shows an example of a biasing mechanism. [Figure 4] An example of grinding the inner surface of an elbow joint is shown, where (a) shows the grinding condition of the inner bend and (b) shows the grinding condition of the outer bend. [Figure 5] (a) shows the grinding condition of the inner bend and (b) shows the grinding condition of the outer bend for the large diameter elbow type. [Figure 6] Examples of base parts are shown, (a) for a small-diameter elbow type, and (b) for a large-diameter elbow type. [Figure 7] The figures show the base for peripheral grinding, (a) shows a small-diameter elbow type, and (b) shows a large-diameter elbow type. [Figure 8] An example of grinding the outer surface of an elbow type is shown. (a) shows the inner bend and (b) shows the outer bend. [Figure 9] An example of outer peripheral grinding for a large diameter elbow type is shown below. [Figure 10] The diagrams show a comparison of (a) and (b) when grinding the end of a pipe fitting horizontally and (c) and (d) when grinding it at an angle. [Figure 11] The figures show explanatory diagrams of (a) and (b) when the center of rotation (rotation axis) during grinding is eccentric to the center (center line) of the opening of the pipe joint, and (c) and (d) when the pipe joint is tilted. [Figure 12] An explanatory diagram for the case of inner peripheral grinding of a pipe joint is shown. DETAILED DESCRIPTION OF THE INVENTION

[0012] An example of the configuration of a grinding device according to the present invention will be described below with reference to the drawings, but the present invention is not limited to this example.

[0013] FIG. 1 shows a partial view of a grinding device, and is a partial view of the device when grinding the outer peripheral surface of an elbow-type pipe fitting, and FIG. 2 is a partial view of the device when grinding the inner peripheral surface of an elbow-type pipe fitting. The grinding device may be an integrated device for grinding the outer peripheral surface and the inner peripheral surface, or each may be a separate grinding device, and therefore, in FIG. 1, each is illustrated as a partial view. The grinding device has a base 11 on which the pipe joint 1 is placed and fixed, and a rotation mechanism 12 that controls the rotation of the base 11. The rotation mechanism may be a known mechanism such as a motor drive mechanism. The grinding tool 21 is detachably attached to the tool holder 20, and has a holder attachment portion 23 for attaching the tool holder 20 and controlling its rotation. The tool molder is attached and detached using a fixture 23a. This base portion is an inclined mounting portion, and FIG. 2 shows the base portion 11 and the inclined mounting portion 11a when the inner peripheral surface of the pipe joint 1 is ground. As shown in FIG. 3, the grinding tool is provided with an elastic member 22 such as a spring so that the cutting edge applies a biasing force toward the part of the pipe joint to be ground, and has an adjustment part 22a for adjusting the biasing force. This allows grinding to be performed while following any horizontal fluctuations of the inner or outer peripheral surface of the pipe joint.

[0014] FIG. 4 shows an example of grinding the inner peripheral surface of an elbow-type pipe joint with a relatively small diameter of 25A. The rotation of the base 11 is controlled by a rotation mechanism 12 . The base portion 11 has an inclined mounting portion 11a that is placed on the open end surface of the pipe fitting, and in this embodiment, the inclined mounting portion is inclined so that the outer bending portion 1b is lower than the inner bending portion 1a of the pipe fitting, and the inclination angle is set to θ1. The grinding tool 21 is attached via a tool holder 20 to a holder device 23 whose rotation is controlled. The grinding tool 21 is attached to the rotation axis O via the holder mounting portion. T The rotation axis O of the base part 11 is the rotation center. B The grinding tool 21 is disposed offset in the horizontal direction from the pipe joint so that the cutting edge of the grinding tool 21 abuts against the pipe joint at an angle. In addition, the rotation axis O of the base part 11 B and the center line of the pipe joint opening Ware offset from each other by d0. As a result, when the cutting edge of the grinding tool abuts against the inner surface of the inner bent portion 1a of the pipe fitting 1 as shown in Figure 4(a), the cutting edge is at an angle that makes it relatively stand up, and when it abuts against the inner surface of the outer bent portion as shown in Figure 4(b), the cutting edge abuts in a relatively tilted manner. This makes the grinding allowance on the inner peripheral surface of the pipe joint uniform. FIG. 5 shows an example of a pipe fitting 2 in which the relatively large diameter is 65A, where (a) shows the state of the inner bent portion and (b) shows the state of the outer bent portion. As described above, as the diameter increases, the difference in the rise angle between the inner bent portion and the outer bent portion decreases. Therefore, in this embodiment, the inclination direction of the inclined mounting portion 11a is set so that the inner bent portion 1a is lower than the outer bent portion 1b, and the value of the inclination angle θ2 is also small. In addition, the rotation axis O of the base part 11 B and the center line of the pipe joint opening W The eccentricity d1 between the lens and the lens is also smaller than in the case of a small diameter lens.

[0015] FIG. 6(a) shows a pedestal 11 for a small diameter, and (b) shows a pedestal for a large diameter. FIG. 7 shows a base portion 11 used when grinding the outer peripheral surface of a pipe joint, (a) showing a small diameter version and (b) showing a large diameter version.

[0016] Figure 8 shows an example of grinding the outer surface of a small-diameter pipe joint. In this case as well, an inclination angle θ3 is set in the inclined mounting portion 11b, but no eccentricity is provided between the rotation axis of the base portion and the center line of the opening of the pipe joint. FIG. 9 shows an example of grinding the outer surface of a large-diameter pipe joint made of 65A. In this case as well, the inclined placement portion 11b is inclined so that the inner bent portion is higher by an inclination angle θ4.

[0017] Next, the function and effect of the grinding device according to the present invention will be described with reference to schematic diagrams. In the grinding device according to the present invention, as shown in FIG. 4(a), the cutting edge of the grinding tool 21 is fixed to the holder device 23 along the rotation axis O. T The grinding tool rotates around this center and contacts the grinding surface at an angle. 10(a) and (b) show the state in which an elbow-type pipe fitting is placed on a pedestal so that the open end is horizontal, and the pipe fitting is rotated while the outer periphery is ground. 1(a) shows a state in which the cutting edge of the grinding tool 21 is positioned at the inner bent portion 1a of the pipe joint, and FIG. 1(b) shows a state in which the cutting edge is positioned at the outer bent portion 1b. As shown in (a), the cutting edge does not easily come into contact with the end of the pipe fitting at the inner bent portion 1a, whereas as shown in (b), the cutting edge comes into contact with the end of the pipe fitting at the outer bent portion 1b, making it difficult to grind the outer periphery uniformly. Therefore, by slightly tilting the end face of the pipe joint and setting an inclination angle θ as shown in Figures 10(c) and (d), it is possible to adjust the cutting edge of the grinding tool 21 so that it abuts near the end even at the inner bent portion as shown in Figure 10(c). This makes it possible to improve the occurrence of grinding irregularities by adjusting the inclination angle θ.

[0018] However, when the inclination angle θ becomes large, the inner bent portion 1a makes it easier to grind the end of the pipe fitting, as shown in Figure 10(c), but in the outer bent portion 1b, as shown in Figure 10(d), there is a risk that the abutting part of the cutting edge will come off the end. Therefore, as a further improvement, the present invention provides a method for grinding the rotating shaft (rotating shaft of the base) O as shown in FIG. B and the center line O of the pipe joint opening W and are arranged eccentrically. This action will be explained with reference to FIG. FIG. 11(a) shows the state in which the inner bent portion is ground, and the rotation axis O B than the center line of the pipe fitting opening W When the grinding tool 21 is eccentric to the right as shown in FIG. 11(a), the cutting edge of the grinding tool 21 rotates in an upright direction to abut against the surface to be ground, and at the outer bent portion as shown in FIG. 11(b), the cutting edge rotates in a downward direction to abut against the surface to be ground. Therefore, as shown in Figures 11(c) and 11(d), an inclination angle θ is provided at the opening of the pipe joint, and the rotation axis O B and the center line of the pipe joint opening W 11(d), when grinding the outer bent portion, the cutting edge of the grinding tool 21 is set to rotate in the tilting direction, and the tilting causes the rotation axis O of the holder device to rotate. T The distance from the cutting edge to the cutting edge that contacts the surface to be ground is longer, and the cutting edge contacts the end side of the pipe fitting even at the outer bent portion, resulting in the outer peripheral surface of the pipe fitting being ground uniformly.

[0019] This effect also works in the grinding of the inner peripheral surface of a pipe joint as shown in FIG. In this case, the cutting edge is set to rotate in a rising direction on the inner peripheral surface of the outer bent portion of the pipe joint as shown in Figure 12(a), and to rotate in a tilting direction on the inner peripheral surface of the inner bent portion as shown in Figure 12(b). [Explanation of symbols]

[0020] 1 Pipe fittings 11 Base 11a Inclined mounting section 20 Tool Holder 21 Grinding Tools 22 Elastic member 23 Holder attachment part

Claims

1. A grinding device for a pipe joint, comprising: The apparatus includes a mounting base portion on which an end face of an opening of a pipe joint is placed and which is controlled to rotate, and a grinding tool that is biased toward an outer peripheral surface or an inner peripheral surface of the opening of the pipe joint, 10. A grinding device for a pipe joint, wherein the base portion has an inclined mounting portion inclined at a predetermined angle.

2. 2. The pipe joint grinding device according to claim 1, wherein the rotation axis of said base portion is disposed eccentrically with respect to the center line of the opening of said pipe joint.

3. the grinding tool is supported by a rotary shaft so that a cutting edge thereof abuts on an outer peripheral surface or an inner peripheral surface of an opening of the pipe joint by a biasing force; 3. A grinding device for a pipe joint according to claim 1, wherein said rotation axis is offset from the center line of the opening of said pipe joint.

4. 4. The pipe joint grinding apparatus according to claim 3, wherein said pipe joint is an elbow type.

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