JP7709396B2 - Pipe surface polishing equipment - Google Patents

Description

This invention relates to a pipe surface polishing device, and in particular to a pipe surface polishing device that can smoothly polish the surface of pipes of any diameter without extensive modification of the polishing device.

For example, a pipe surface polishing device that polishes the surface of a stainless steel pipe has multiple polishing machines installed at intervals along a polishing line on a base.

The grinding machine is equipped with a flap wheel that is rotated by a motor, and the flap wheel is used to grind the surface of the stainless steel pipe.

In such conventional polishing devices, the stainless steel pipe is rotated around its axis while passing through a polishing machine to polish the surface of the stainless steel pipe.

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

The conveying means 120 includes a forced drive roll 121 that rotates clockwise in FIG. 7 by a motor, and an idler roll 122 that rotates clockwise by the stainless steel pipe 105 that rotates counterclockwise with the rotation of the forced drive roll 121. The idler roll 122 is arranged with its rotation axis tilted by 2° to 15° with respect to the rotation axes of the forced drive roll 121 and the stainless steel pipe 105. When the idler roll 122 rotates due to the stainless steel pipe 105 rotated by the forced drive roll 121, the idler roll 122 moves the stainless steel pipe 105 so as to push it in the axial direction along the polishing line due to the tilt of the rotation axis of the idler roll 122.

As shown in FIG. 8, the grinding machine is equipped with a grinding means 130 in which the surface of the stainless steel pipe 105 is ground by a flap wheel 104, and as the surface of the stainless steel pipe 105 is ground, the stainless steel pipe 105 rotates counterclockwise. For this reason, the drive receiving roll 123, which is located on the same line as the rotation axis of the forced drive roll 121 of the conveying means 120, is not forced to rotate so as not to apply a rotational force to the stainless steel pipe 105, but is configured to rotate passively in response to the rotation of the stainless steel pipe 105.

JP 2017-170587 A

Using the conventional polishing device described above, it is possible to polish the stainless steel pipe 105 to the target surface roughness without extensive modifications to the polishing device.

However, in conventional polishing devices, when the diameter of the stainless steel pipe 105 to be polished is small (for example, φ13.0 or less), a problem occurs in which the stainless steel pipe 105 comes off the conveying means 120 or the rolls of the polishing means 130 inside the polishing device, resulting in defective processing.

As shown in Figure 9, when the diameter of the stainless steel pipe 105 becomes small, the flap wheel 104 that polishes the stainless steel pipe 105 descends. At this time, the flap wheel 104 comes into contact with the drive receiving roll 123, causing the drive receiving roll 123 to rotate in the reverse direction (counterclockwise). As a result, the stainless steel pipe 105 stops rotating, causing the idler roll 126 to stop rotating, resulting in poor conveyance.

The present invention was developed in consideration of the above problems, and aims to provide a pipe surface polishing device that can increase yield without causing transport problems regardless of the diameter of the stainless steel pipe.

In order to solve the above problems, the pipe surface polishing apparatus of the present invention is a pipe surface polishing apparatus having a polishing machine arranged along the extension 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 having a flap wheel for polishing the surface of the pipe, the conveying means comprising a forced drive roll that contacts the pipe and is forcibly driven in the circumferential direction of the extension direction, and a first idler roll that contacts the pipe and rotates with the rotation of the pipe and has a rotation axis inclined with respect to the extension direction, the polishing means comprises a driven receiving roll that is attached to a lifting device that raises and lowers the rotation axis of the flap wheel and is arranged freely movable in the vertical direction of the pipe, and is arranged coaxially with the forced drive roll, and a second idler roll that contacts the pipe and rotates with the rotation of the pipe and has a rotation axis inclined with respect to the extension direction, the driven receiving roll is connected coaxially with the forced drive roll and rotates with the rotation of the forced drive roll.

In addition, in the pipe surface polishing device according to the present invention, it is preferable that the pipe has a diameter of φ13.0 or less.

In addition, in the pipe surface polishing device according to the present invention, it is preferable that the pipe is a stainless steel pipe.

In addition, in the pipe surface polishing device according to the present invention, it is preferable that multiple polishing machines are arranged along the polishing line.

According to this invention, the driving roller of the polishing means is coaxially connected to the forced driving roller of the transport means and rotates with the rotation of the forced driving roller. Therefore, when the pipe to be polished has a small diameter, even if the flap wheel descends until it comes into contact with the driving roller, the driving roller does not rotate in the reverse direction due to the contact of the flap wheel, and the pipe can be transported without stopping the rotation of the second idler roller.

FIG. 1 is a front view showing a pipe surface polishing device according to an embodiment of the present invention. FIG. 2 is a side view showing a pipe surface polishing device according to an embodiment of the present invention. FIG. 2 is a plan view showing a conveying means of the pipe surface polishing apparatus according to the embodiment of the present invention. FIG. 2 is a plan view showing a conveying means and a polishing means of the pipe surface polishing apparatus according to the embodiment of the present invention. FIG. 4 is a schematic diagram for explaining the operation of a conveying means of the pipe surface polishing apparatus according to the embodiment of the present invention. FIG. 2 is a schematic diagram for explaining the operation of a polishing means of the pipe surface polishing apparatus according to the embodiment of the present invention. FIG. 13 is a schematic diagram for explaining the operation of a conveying means of a conventional pipe surface polishing apparatus. FIG. 13 is a schematic diagram for explaining the operation of a polishing means of a conventional pipe surface polishing apparatus. FIG. 13 is a schematic diagram for explaining the operation when polishing a small diameter pipe in the polishing means of the conventional pipe surface polishing apparatus.

Below, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

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 a pipe surface polishing apparatus according to an embodiment of the present invention, Figure 3 is a plan view showing a conveying means of a pipe surface polishing apparatus according to an embodiment of the present invention, Figure 4 is a plan view showing a conveying means and polishing means of a pipe surface polishing apparatus according to an embodiment of the present invention, Figure 5 is a schematic diagram for explaining the operation of the conveying means of a pipe surface polishing apparatus according to an embodiment of the present invention, and Figure 6 is a schematic diagram for explaining the operation of the polishing means of a pipe surface polishing apparatus according to an embodiment of the present invention.

As shown in Figures 1 and 2, the pipe surface polishing device according to this embodiment is composed of multiple polishing machines 2a to 2f (six in this example) spaced apart along the polishing line on a base 1.

The polishing machine 2 has a conveying means 20 that conveys the stainless steel pipe 5 in the direction of the polishing line, and a polishing means 30 that polishes the stainless steel pipe 5. In addition, a conveying means (not shown) that receives the stainless steel pipe 5 is attached in front of the polishing machine 2a on the most upstream side.

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 flap wheel 4 polishes the surface of the stainless steel pipe 5. The flap wheel 4 is housed in a cover case 6. The direction of movement of the stainless steel pipe 5 is indicated by an arrow in the figure.

The flap wheel 4 can be of any shape known in the art, and is preferably made of sandpaper attached radially around a cylindrical core.

The flap wheel 4 is attached so that it can be raised and lowered to match the outer diameter of the stainless steel pipe 5 to be polished, and more specifically, 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, it is possible to properly polish stainless steel pipes 5 of any outer diameter.

The roughness of the flap wheels 4 becomes finer from grinders 2a to 2f. That is, the most upstream grinder 2a is composed of a #100 flap wheel 4a and a #120 flap wheel 4b, with the flap wheel 4a located upstream.

The roughness of the flap wheel 4 of grinder 2b is #240, the roughness of the flap wheel 4 of grinders 2c and 2d is #320, the roughness of the flap wheel 4 of grinder 2e is #400, and the roughness of the flap wheel 4 of grinder 2f is #500.

To polish the surface of a stainless steel pipe 5 using the pipe surface polishing device of this embodiment, the stainless steel pipe 5 is rotated around its axis by the conveying means 20 while passing through the polishers 2a to 2f.

As shown in FIG. 3, the conveying means 20 includes a forced drive roll 21 and a first idler roll 22. The forced drive roll 21 has a forced drive rotation shaft 24, to which a rotational force is applied by a driving device such as a motor (not shown). A plurality of forced drive rolls 21 are arranged along the forced drive rotation shaft 24, and it is preferable to attach three rolls, for example. In addition, it is preferable that the forced drive rotation shaft 24 is rotatably held by a bearing (not shown) to ensure smooth rotation while applying a radial load.

The first idle roll 22 is a member that is rotatably attached around the idle roll rotation shaft 25. The idle roll rotation shaft 25 is preferably arranged at an inclination of 2° to 15° with respect to the forced drive rotation shaft 24, and more preferably at an inclination of 7° to 11°. By inclining the idle roll rotation shaft 25, the rotation of the first idle roll 22 can move the stainless steel pipe 5 in the longitudinal direction so as to push it out.

It is preferable that the first idler roll 22 is disposed at a position corresponding to the forced drive roll 21. The idler roll rotation shaft 25 is provided so as to be rotatable independently for each first idler roll 22.

The stainless steel pipe 5 is transported in the longitudinal direction while rotating between the forced drive roll 21 and the first idler roll 22.

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

The drive receiving roll 23 is attached coaxially to the drive receiving rotation shaft 27 arranged coaxially with the forced drive rotation shaft 24, and the drive receiving rotation shaft 27 is connected to the forced drive rotation shaft 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 manner as the rotation of the forced drive roll 21.

The second idler roll 26 has a configuration similar to that of the first idler roll 22 of the conveying means 20, and is rotatably attached to an idler roll rotation shaft 25 that is tilted at a predetermined angle from the extension direction.

Next, the operation of the pipe surface polishing device according to this embodiment will be described with reference to Figures 5 and 6. As shown in Figure 5, the conveying means 20 rotates the forced drive roll 21 clockwise to which a driving force is applied by a driving means such as a motor. At this time, the stainless steel pipe 5 is in contact with the forced drive roll 21 and the first idler roll 22, so that the stainless steel pipe 5 rotates counterclockwise in conjunction with the rotation of the forced drive roll 21.

The first idler roll 22 rotates clockwise as the stainless steel pipe 5 rotates counterclockwise. At this time, the idler roll rotation axis 25 of the first idler roll 22 is inclined with respect to the extension direction, so that the stainless steel pipe 5 is pushed out in the extension direction by the rotation of the first idler roll 22.

Next, as shown in FIG. 6, the polishing means 30 polishes the surface of the stainless steel pipe 5 by rotating the flap wheel 4 that has been lowered to match the outer diameter of the stainless steel pipe 5. Polishing the stainless steel pipe 5 causes it to rotate counterclockwise. At this time, the drive receiving roll 23 is coaxially connected to the forced drive roll 21, so it rotates clockwise like the forced drive roll 21. Therefore, even if the flap wheel 4 comes into contact with the drive receiving roll 23, the rotation direction of the drive receiving roll 23 will not reverse, and the rotation direction of the stainless steel pipe 5 can be maintained counterclockwise.

The second idler roll 26 transports the stainless steel pipe 5 in the extension direction by rotating the stainless steel pipe 5 counterclockwise, in the same manner as the first idler roll 22 described above.

In this way, according to the pipe surface polishing device of this embodiment, the driving receiver roll 23 of the polishing means 30 is connected to the forced driving roll 21 and a rotational force is applied thereto. Therefore, even if the flap wheel 4 comes into contact with the driving receiver roll 23, the rotational direction of the driving receiver roll 23 is not changed, and the rotational direction of the stainless steel pipe 5 is maintained, and the rotational force is appropriately transmitted to the second idler roll 26, so that the transport by the second idler roll 26 is not hindered.

Therefore, when the diameter of the stainless steel pipe 5 is small, even if the flap wheel 4 is lowered to the point where it comes into contact with the drive receiving roll 23, the rotation direction of the second idler roll 26 can be maintained, and the yield of the pipe surface polishing device can be increased without causing conveying problems regardless of the stainless steel pipe 5 diameter.

In the above-described embodiment of the pipe surface polishing device, the forced drive roll 21 is described as rotating clockwise, but the rotation direction of the forced drive roll 21 is not limited to this, and it may be rotated counterclockwise.

In addition, although the above description has been given with three forced drive rolls 21, three first idle rolls 22, three drive receiving rolls 23, and three second idle rolls 26, the number of these can be increased or decreased as appropriate. Furthermore, the pipes are not limited to stainless steel pipes. It is clear from the claims that such modified or improved forms are also included within the technical scope of the present invention.

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

Claims (4)

A pipe surface polishing apparatus comprising a polishing machine arranged along an extension 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 having a flap wheel for polishing a surface of the pipe,
The conveying means includes a forced drive roll that contacts the pipe and is forcedly driven in the circumferential direction of the extension direction, and a first idler roll that contacts the pipe and rotates with the rotation of the pipe and has a rotation axis inclined with respect to the extension direction,
The grinding means is attached to a lifting device that lifts and lowers the rotation axis of the flap wheel, is arranged to be freely movable in the vertical direction of the pipe, and includes a drive receiving roll arranged coaxially with the forced drive roll, and a second idler roll that abuts against the pipe and is rotated with the rotation of the pipe, and has a rotation axis inclined with respect to the extension direction,
13. A pipe surface polishing apparatus, comprising: a driving receiving roll which is coaxially connected to the forced driving roll and which rotates in conjunction with the rotation of the forced driving roll. 2. The pipe surface polishing apparatus according to claim 1,
A pipe surface polishing apparatus, wherein the pipe has a diameter of φ13.0 or less. 3. The pipe surface polishing apparatus according to claim 1,
13. A pipe surface polishing apparatus, wherein the pipe is a stainless steel pipe. The pipe surface polishing apparatus according to any one of claims 1 to 3,
A pipe surface polishing apparatus, characterized in that a plurality of the polishing machines are arranged along the polishing line.