JPS64129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for separating wrapper rolls in a down coiler having a mandrel employing double expansion.

When winding a strip onto a mandrel, there is usually a step A at the tip of the strip B as shown in Figure 1.
The wrapper roll c collides with the strip, causing scratches on the strip. Therefore, the Latsupar roll c is more than necessary.
If you press the strip for a long time, the scratched part will become longer and the yield will decrease. Therefore, when the strip B is wound tightly onto the mandrel A and the friction between the strip B and the mandrel A makes it possible to wind the strip B, it is necessary to quickly It is necessary to release the pressure of wrapper roll c.

Conventionally, the release of the wrapper roll was performed as follows.

When the strip b is wound onto the mandrel a, the load on the motor driving the mandrel a increases compared to before the tightening ratio. After the required time has elapsed from the time of this load increase, that is, after a sufficient time has elapsed for the strip b to be tightly wrapped around the mandrel a, the pressing force of the wrapper roll c is released.

For this reason, in the conventional method, the pressing time of the wrapper roll was set long enough to allow for a margin in order to ensure tight winding. Therefore, the longer the pressing time, the more chances of scratches occurring. Furthermore,
Since load increase is detected by detecting a change in current value, it is susceptible to disturbances and lacks reliability.

The present invention solves the above-mentioned drawbacks of the conventional method, quickly and reliably confirms the winding of the strip around the mandrel, and prevents as much as possible scratches that occur at the step where the strip is wound by the wrapper roll. The purpose of this invention is to provide a method that can improve the yield of strips, by driving a cylinder for driving an expansion/contraction shaft of a mandrel,
This invention relates to a wrapper roll separation method characterized in that the amount of movement of the expansion/contraction shaft is detected, and when the amount of movement of the expansion/contraction shaft is not detected, the pressing by the wrapper roll is released.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of separating a strip from a wrapper roll according to the present invention will be explained below with reference to the drawings. 2 and 3 are explanatory diagrams showing an example of an apparatus for implementing the present invention, in which a block 5 is installed in a mandrel 1 rotatably attached to a frame 2 via a bearing 3.
A wedge shaft 6 equipped with a wedge 4 that can be wedged with the block 5 is housed in the mandrel 1 so that the mandrel 1 is expanded or contracted by the movement of the wedge shaft 6. A hydraulic cylinder 7 capable of step movement is connected to a side end protruding from the cylinder 7, a piston 8 of the hydraulic cylinder 7 is provided with a shaft 9 passing through the casing of the hydraulic cylinder 7, and a position sensor 10 is attached to one end of the shaft 9. is provided so that movement of the shaft 9 can be detected.

Lapper roll 1 pressed against the mandrel 1
1 is a rotating shaft 12 provided in a housing (not shown).
A piston rod 16 of a hydraulic cylinder 15 is connected to the free end side of each arm 13 by a pin, and the hydraulic cylinder 15 is controlled by a control device 17. It is operated via a servo valve 18.

A movement amount detection signal of the shaft 9 is sent from the position sensor 10 to the control device 17,
If the amount of movement is not detected, use Latsupar Roll 1.
Pressure oil is supplied in the direction to release the pressing force 1, that is, to the rod side of the hydraulic cylinder 15, and when the start of winding and the amount of movement of the shaft 9 is detected, pressure oil is supplied to the head side of the hydraulic cylinder 15. supply.

Next, a method of confirming completion of winding of the strip using the above device will be explained. The strip is wrapped around the mandrel 1 using wrapper rolls,
When the winding is tightened, even if the hydraulic cylinder 7 is operated in the mandrel expansion direction, the mandrel 1 will receive resistance from the tightening of the strip, so the shaft 9 will
does not move in the direction of the arrow. However, mandrel 1
If the strip is not wound tightly enough, even if the hydraulic cylinder 7 is operated in the direction of expanding the mandrel, the mandrel 1 will not receive any resistance from the tightening and will over-expand, so the shaft 9 will move in the direction of the arrow and this Movement is detected by position sensor 10.

Therefore, after the required time has elapsed since the start of winding the strip, hydraulic pressure is applied to the mandrel enlarged hydraulic system of the hydraulic cylinder 7, and the position sensor 10 detects the movement of the shaft 9 based on the movement of the wedge shaft 6 in the direction of the arrow by the hydraulic pressure. If detected,
This indicates that the strip is not tightened enough and the winding is not completed, so the wrapper roll 11
The pressure is continued and hydraulic pressure is applied to the cylinder 7 again, and the movement of the wedge shaft 6 and shaft 9 is detected by the position sensor 10. If no movement of the shaft 9 is detected even after applying hydraulic pressure, it is determined that the wrapping has been completed. , the pressing by the wrapper roll 11 is released.

That is, from the position sensor 10 to the shaft 19
A movement amount detection signal is sent to the control device 17, and if the movement amount of the shaft 9 is zero, pressure oil is supplied to the rod side of the hydraulic cylinder 15 via the servo valve 18, and the arm 13 is rotated by retraction of the piston rod 16. The arm 13 rotates around an axis 12.
The wrapper roll 11 held in is pulled away.

However, when the piston 8 reaches the stroke end of the hydraulic cylinder 7, it is determined that the winding is not completed, and the pressing of the wrapper roll is released by another method not described in the text.

As described above, according to the present invention, it is possible to quickly and reliably confirm the completion of winding the strip around the mandrel, and to release the pressing force of the wrapper roll, thereby preventing the occurrence of scratches at the stepped portion of the wound strip. It exhibits various excellent effects, such as being able to minimize it and improving the yield of strips.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the winding state of a strip by a mandrel, FIG. 2 is a sectional view of a shaft movement amount detecting section in an apparatus for implementing the present invention, and FIG. It is a side view of the wrapper roll drive part in an apparatus. In the figure, 1 is a mandrel, 3 is a bearing, 4 is a wedge, 5 is a block having a wedge portion, 6 is a wedge shaft, 7 is a hydraulic cylinder, 10 is a position sensor, 11 is a wrapper roll, and 13 is an arm.

Claims (1)

[Claims] 1. Drive the expansion/contraction shaft driving cylinder of the mandrel, detect the amount of movement of the expansion/contraction shaft,
A tapper roll separation method characterized in that the pressing by the tapper roll is released when the amount of movement of the expansion/contraction shaft is not detected.