Pipe surface grinding device

Abstract

To provide a pipe surface polishing device which can suppress defective conveyance regardless of any diameter of a stainless steel pipe to improve yielding percentage.SOLUTION: Transport means includes: a forced drive roller which contacts with a pipe and which is forcibly driven in a circumferential direction of an extension direction; and a first idle wheel roller which is contacted with the pipe to be rotated with rotation of the pipe, and whose rotation axis is slanted against the extension direction. Polishing means includes: a drive receiver roller which is coaxially arranged with the forced drive roller while a flap wheel is arranged to be movable in a vertical direction of the pile; and a second idle wheel roller which is contacted with the pipe to be rotated with rotation of the pipe, and whose rotation axis is slanted against the extension direction. The drive receiver roller is coaxially connected with the forced drive roller to be rotated with rotation of the forced drive roller.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a pipe surface polishing device, and more particularly, to a pipe surface polishing device that can smoothly polish the surface of a pipe of any diameter without large-scale modification of the polishing device.

Background Art

[0002] For example, in a pipe surface polishing device for polishing the surface of a stainless steel pipe, a plurality of polishing machines are installed at intervals along a polishing line on a base.

[0003] The polishing machine includes a flap wheel rotated by a motor, and the surface of the stainless steel pipe is polished by the flap wheel.

[0004] In order to polish the surface of the stainless steel pipe, such a conventional polishing device passes the stainless steel pipe through the polishing machine while rotating the stainless steel pipe around its axis.

[0005] Specifically, as shown in FIG. 7, conveying means 120 is provided before and after the polishing machine, and by the conveying means 120, the stainless steel pipe 105 is axially conveyed along the polishing line.

[0006] The conveying means 120 includes a forced drive roll 121 rotated clockwise in FIG. 7 by a motor, and a follower roll 122 rotated clockwise by the stainless steel pipe 105 rotated counterclockwise as the forced drive roll 121 rotates. The follower roll 122 is arranged with its rotation axis inclined 2° to 15° with respect to the rotation axes of the forced drive roll 121 and the stainless steel pipe 105. When the follower roll 122 is rotated by the stainless steel pipe 105 rotated by the forced drive roll 121, due to the inclination of the rotation axis of the follower roll 122, the follower roll 122 is moved so as to push out the stainless steel pipe 105 axially along the polishing line.

[0007] Further, as shown in FIG. 8, the polishing machine includes a polishing means 130 for polishing the surface of the stainless steel pipe 105 by the flap wheel 104. When the surface of the stainless steel pipe 105 is polished, the stainless steel pipe 105 rotates counterclockwise. For this reason, the driven roll 123 located on the same line as the rotation axis of the forced drive roll 121 of the conveying means 120 is not forcedly driven so as not to apply a rotational force to the stainless steel pipe 105, and is configured to rotate passively according to the rotation of the stainless steel pipe 105.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] According to the above-described conventional polishing apparatus, the stainless steel pipe 105 can be polished to a target surface roughness without performing a large-scale modification of the polishing apparatus.

[0010] However, in the conventional polishing apparatus, when the diameter of the stainless steel pipe 105 to be polished becomes small (for example, φ13.0 or less), the stainless steel pipe 105 comes off the rolls of the conveying means 120 and the polishing means 130 within the polishing apparatus, resulting in processing defects.

[0011] As shown in FIG. 9, when the diameter of the stainless steel pipe 105 becomes small, the flap wheel 104 for polishing the stainless steel pipe 105 descends. At this time, the flap wheel 104 comes into contact with the driven roll 123 and rotates the driven roll 123 in the reverse rotation (counterclockwise) direction. As a result, it has been found that the rotation of the idle roll 126 stops because the stainless steel pipe 105 does not rotate, causing a conveyance failure.

[0012] Therefore, the present invention is an invention made in view of the above problems, and an object thereof is to provide a pipe surface polishing apparatus that can improve the yield without causing conveyance failure for stainless pipes of any diameter.

Means for Solving the Problems

[0013] In order to solve the above problems, a pipe surface polishing apparatus according to the present invention has a polishing machine arranged along the extending direction of a polishing line on a base, and the polishing machine includes a conveying means for conveying a pipe along the polishing line, and a polishing means including a flap wheel for polishing the surface of the pipe. The conveying means includes a forced drive roll that contacts the pipe and is forcibly driven in the circumferential direction of the extending direction, and a first idle roll that contacts the pipe and rotates as the pipe rotates, and the rotation axis of which is inclined with respect to the extending direction. The polishing means includes the flap wheel is attached to a lifting device that raises and lowers the rotation axis a drive receiving roll that is movably arranged in the vertical direction of the pipe and is arranged coaxially with the forced drive roll, and a second idle roll that contacts the pipe and rotates as the pipe rotates, and the rotation axis of which is inclined with respect to the extending direction. The drive receiving roll is connected coaxially with the forced drive roll and rotates as the forced drive roll rotates.

[0014] Further, in the pipe surface polishing apparatus according to the present invention, the pipe preferably has a diameter of φ13.0 or less.

[0015] Further, in the pipe surface polishing apparatus according to the present invention, the pipe is preferably a stainless pipe.

[0016] Further, in the pipe surface polishing apparatus according to the present invention, it is preferable that a plurality of the polishing machines are arranged along the polishing line.

Effects of the Invention

[0017] According to the present invention, the driven roll of the polishing means is coaxially connected to the forced drive roll of the conveying means and rotates with the rotation of the forced drive roll. Therefore, when the pipe to be polished has a small diameter, even if the flap wheel descends until it contacts the driven roll, the driven roll will not rotate reversely due to the contact of the flap wheel, and the pipe can be conveyed without stopping the rotation of the second idle roll.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0019] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

[0020] Figure 1 is a front view showing a pipe surface polishing apparatus according to an embodiment of the present invention, Figure 2 is a side view showing the pipe surface polishing apparatus according to the embodiment of the present invention, Figure 3 is a plan view showing a conveying means of the pipe surface polishing apparatus according to the embodiment of the present invention, Figure 4 is a plan view showing the conveying means and the polishing means of the pipe surface polishing apparatus according to the embodiment of the present invention, Figure 5 is a schematic view for explaining the operation of the conveying means of the pipe surface polishing apparatus according to the embodiment of the present invention, and Figure 6 is a schematic view for explaining the operation of the polishing means of the pipe surface polishing apparatus according to the embodiment of the present invention.

[0021] As shown in Figures 1 and 2, the pipe surface polishing apparatus according to the present embodiment is composed of a plurality (six in this example) of polishing machines 2a to 2f installed at intervals along the polishing line on the base 1.

[0022] The polishing machine 2 has a conveying means 20 for conveying the stainless steel pipe 5 in the extending direction of the polishing line and a polishing means 30 for polishing the stainless steel pipe 5. In addition, a conveying means (not shown) for receiving the stainless steel pipe 5 is attached in front of the polishing machine 2a on the most upstream side.

[0023] The polishing means 30 of the polishing machines 2a to 2f includes a flap wheel 4 attached to a rotating shaft 7 rotated by a motor 3, and the surface of the stainless steel pipe 5 is polished by the flap wheel 4. The flap wheel 4 is housed in a cover case 6. The moving direction of the stainless steel pipe 5 is indicated by an arrow in the figure.

[0024] The flap wheel 4 can be appropriately adopted in a conventionally well-known shape. For example, it is preferably composed of a sandpaper attached radially around a cylindrical core material.

[0025] Further, the flap wheel 4 is attached so as to be movable up and down in accordance with the outer diameter of the stainless steel pipe 5 to be polished. Specifically, it is preferably attached to a lifting device 12 that raises and lowers the rotating shaft 7. By raising and lowering the flap wheel 4 with this lifting device 12, polishing can be appropriately performed on a stainless steel pipe 5 of any outer diameter.

[0026] The coarseness of the flap wheel 4 becomes finer as it goes from the polishing machines 2a to 2f. That is, the polishing machine 2a on the most upstream side is composed of a #100 flap wheel 4a and a #120 flap wheel 4b arranged in series with the flap wheel 4a on the upstream side.

[0027] The coarseness of the flap wheel 4 of the polishing machine 2b is #240, the coarseness of the flap wheels 4 of the polishing machines 2c and 2d is #320 respectively, the coarseness of the flap wheel 4 of the polishing machine 2e is #400, and the coarseness of the flap wheel 4 of the polishing machine 2f is #500.

[0028] To polish the surface of the stainless steel pipe 5 with the pipe surface polishing device according to the present embodiment, the stainless steel pipe 5 is passed through the polishing machines 2a to 2f while being rotated around its axis by the conveying means 20.

[0029] As shown in FIG. 3, the conveying means 20 includes a forced drive roll 21 and a first idle roll 22. The forced drive roll 21 has a forced drive rotating shaft 24, and a rotational force is applied to the forced drive rotating shaft 24 by a drive device such as a motor (not shown). A plurality of forced drive rolls 21 are arranged along the forced drive rotating shaft 24, and it is preferable to attach, for example, three of them. Further, the forced drive rotating shaft 24 is preferably rotatably held by a bearing (not shown) in order to smooth the rotation while bearing the radial load.

[0030] The first idle roll 22 is a member rotatably attached around the idle roll rotation axis 25. The idle roll rotation axis 25 is preferably arranged at an inclination of 2° to 15° with respect to the forced drive rotation axis 24, and more preferably at an inclination of 7° to 11°. Due to the inclination of the idle roll rotation axis 25, the rotation of the first idle roll 22 can move the stainless steel pipe 5 in a manner that extrudes it in the longitudinal direction.

[0031] In addition, it is preferable that the first idle roll 22 is arranged at a position corresponding to the forced drive roll 21. Also, the idle roll rotation axis 25 is provided to be rotatable independently for each first idle roll 22.

[0032] The stainless steel pipe 5 is conveyed in the longitudinal direction while rotating between the forced drive roll 21 and the first idle roll 22.

[0033] As shown in FIG. 2, the lower part of the flap wheel 4 of the polishing means 30 has the same configuration as the conveying means 20. Specifically, as shown in FIG. 4, it includes a drive receiving roll 23 arranged coaxially with the forced drive roll 21 of the conveying means 20, and a second idle roll 26 arranged coaxially with the first idle roll 22.

[0034] The drive receiving roll 23 is coaxially attached to a drive receiving rotation axis 27 arranged coaxially with the forced drive rotation axis 24, and the drive receiving rotation axis 27 is connected to the forced drive rotation axis 24 by a connecting means 31. Therefore, the drive receiving roll 23 is given a rotational force from a driving means such as a motor in the same way as the rotation of the forced drive roll 21.

[0035] Also, the second idle roll 26 has the same configuration as the first idle roll 22 of the conveying means 20, and is rotatably attached by an idle roll rotation axis 25 arranged at a predetermined angle inclined from the extending direction.

[0036] Next, with reference to FIGS. 5 and 6, the operation of the pipe surface polishing apparatus according to the present embodiment will be described. As shown in FIG. 5, in the conveying means 20, the forced drive roll 21 to which a driving force is applied by a driving means such as a motor rotates clockwise. At this time, since the stainless steel pipe 5 is in contact with the forced drive roll 21 and the first idle roll 22, the stainless steel pipe 5 rotates counterclockwise as the forced drive roll 21 rotates.

[0037] The first idle roll 22 rotates clockwise as the stainless steel pipe 5 rotates counterclockwise. At this time, since the idle roll rotation axis 25 of the first idle roll 22 is inclined with respect to the extending direction, the stainless steel pipe 5 is conveyed so as to be pushed out in the extending direction by the rotation of the first idle roll 22.

[0038] Next, as shown in FIG. 6, the polishing means 30 polishes the surface of the stainless steel pipe 5 by the rotation of the flap wheel 4 lowered according to the outer diameter of the stainless steel pipe 5. By polishing the stainless steel pipe 5, the stainless steel pipe 5 rotates counterclockwise. At this time, since the driven roll 23 is connected coaxially with the forced drive roll 21, it rotates clockwise in the same manner as the forced drive roll 21. Therefore, even when the flap wheel 4 comes into contact with the driven roll 23, the rotation direction of the driven roll 23 does not reverse, and the rotation direction of the stainless steel pipe 5 can be maintained counterclockwise.

[0039] The second idle roll 26 conveys the stainless steel pipe 5 so as to push it out in the extending direction in the same manner as the first idle roll 22 described above as the stainless steel pipe 5 rotates counterclockwise.

[0040] Thus, according to the pipe surface polishing apparatus according to the present embodiment, since the driven roll 23 of the polishing means 30 is connected to the forced drive roll 21 and a rotational force is applied, even when the flap wheel 4 contacts the driven roll 23, the rotational direction of the driven roll 23 is not changed, the rotational direction of the stainless steel pipe 5 is maintained, and the rotational force is appropriately transmitted to the second idle roll 26 without inhibiting the conveyance by the second idle roll 26.

[0041] Therefore, even when the flap wheel 4 descends to the extent that it contacts the driven roll 23 when the diameter of the stainless steel pipe 5 is small, the rotational direction of the second idle roll 26 can be maintained, and regardless of the diameter of the stainless steel pipe 5, conveyance failure does not occur, and the yield of the pipe surface polishing apparatus can be increased.

[0042] In addition, although the pipe surface polishing apparatus according to the present embodiment described above has been described for the case where the forced drive roll 21 is rotated clockwise, the rotational direction of the forced drive roll 21 is not limited to this, and it may be rotated counterclockwise.

[0043] Also, although the case where three of each of the forced drive roll 21, the first idle roll 22, the driven roll 23, and the second idle roll 26 are arranged has been described, these numbers can be appropriately increased or decreased. Furthermore, the pipe is not limited to a stainless steel pipe. It is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0044] 1 Base, 2a to 2f Grinding machine, 3 Motor, 4 Flap wheel, 5 Stainless steel pipe, 6 Cover case, 7 Rotation shaft, 12 Lifting device, 20, 120 Conveying means, 21, 121 Forced drive roll, 22 First idle roll, 23, 123 Driven roll, 24 Forced drive rotation shaft, 25 Idle roll rotation shaft, 26 Second idle roll, 27 Driven rotation shaft, 30, 130 Grinding means, 31 Connecting means, 122 Idle roll.

Claims

1. A pipe surface polishing apparatus having a polishing machine arranged along the extending direction of a polishing line on a base, the polishing machine comprising: a conveying means for conveying a pipe along the polishing line; and a polishing means including a flap wheel for polishing the surface of the pipe, wherein the conveying means includes a forced drive roll that contacts the pipe and is forcibly driven in the circumferential direction of the extending direction, and a first idle roll that contacts the pipe and rotates as the pipe rotates, and has a rotation axis inclined with respect to the extending direction, the polishing means is attached to a lifting device for lifting and lowering the rotation axis of the flap wheel, is arranged to be movable in the vertical direction of the pipe, includes a drive receiving roll arranged coaxially with the forced drive roll, and a second idle roll that contacts the pipe and rotates as the pipe rotates, and has a rotation axis inclined with respect to the extending direction, and the drive receiving roll is connected coaxially with the forced drive roll and rotates as the forced drive roll rotates. A pipe surface polishing apparatus characterized by this.

2. In the pipe surface polishing apparatus according to Claim 1, the pipe has a diameter of φ13.0 or less. A pipe surface polishing apparatus characterized by this.

3. In the pipe surface polishing apparatus according to Claim 1 or 2, the pipe is a stainless steel pipe. A pipe surface polishing apparatus characterized by this.

4. In the pipe surface polishing apparatus according to any one of Claims 1 to 3, a plurality of the polishing machines are arranged along the polishing line. A pipe surface polishing apparatus characterized by this.

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