JPS5865514A - Uncoiler - Google Patents

Abstract

PURPOSE:To prevent a coil from deformation and damage, etc., and to improve the yield, by automatically controlling a pressure controlling valve from uncoiling condition and the outer coil diam. on the way of uncoiling, and regulating the hydraulic pressure of a cylinder for expanding and shrinking a drum to be an optimum. CONSTITUTION:An expanding and shrinking operation of a drum is performed by changing the position of a changeover valve 2 to (a) or (b). Further, setting of an expanding force of the drum is performed by setting a hydraulic pressure, given to a side chamber 10 of a rotary cylinder rod, with the aid of a pressure controlling valve 21. The valve 21 is optionally set by a command of a controlling device 24; an optimum drum expanding force is computed and converted to a command given to the valve 21, by inputting the uncoiling conditions such as the outer coil diam., sheet width, and uncoiling tension, and the outer coil diam. detected on the way of uncoiling by a detector 22, to the device 24. Thus the drum expanding force corresponding to the uncoiling condition is always given by controlling so as to obtain the optimum hydraulic pressure at the valve 21 under said commands.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an unwinding machine for strip steel coils in rolling equipment, refining equipment, etc., and particularly relates to an expandable unwinding machine (hereinafter referred to as a drum) and an unwinding machine for applying expansion force to the drum. The present invention relates to an unwinding machine that is equipped with a rotating cylinder and a fluid circuit that controls the cylinder, and that can automatically adjust the expansion force of a drum according to unwinding conditions.

The expansion force of the unwinding drum is determined by unwinding conditions such as the weight of the unwinding coil, unwinding force, and coil diameter. The expansion force of this drum is usually the maximum coil weight, maximum unwinding force,
It is normal to set the expansion force based on the most stringent conditions such as the maximum coil diameter. In other words, this expansion force is adjusted by adjusting the pressure of the fluid applied to the rotating cylinder using a pressure reducing valve, so it would be inefficient to set the setting every time the unwinding conditions change. Normally, no settings are made.

The conventional method of unwinding a coil is to switch the switching valve to apply low pressure when the diameter becomes small, but once this is set, it can be set every time the winding conditions such as sheet width and thickness change. Doing so is inefficient, so I don't do it.

Therefore, with conventional equipment, it was difficult to apply an optimal drum expansion force that matched the unwinding conditions, so an excessive expansion force was always applied to the drum, which required a high-strength drum and caused deformation of the strip. , there was a drawback that it caused scratches, etc.

In order to solve the above-mentioned problems, the present invention makes it possible to automatically apply an optimum drum expansion force by specifying and controlling unwinding conditions.

FIG. 1 is a hydraulic circuit diagram of an unwinding machine having a conventionally used hydraulic circuit for adjusting drum expansion force, and a cross-sectional view of the unwinding machine.

To expand the unwinding machine drum, when the switching valve 2 is switched to the a position, the pressure oil from the hydraulic source 1 passes through the pressure reducing valve 3, flows into the pressure oil port 6 of the rotary joint body 5, and then flows into the rotary joint header. 8. Passes through the hole in the rotating cylinder -9 and is fed into the rotating cylinder rod side chamber 10. With this pressure oil, the piston 12 pulls the piston rod 13, moves the spreader 14 connected to the piston rod in the axial direction, and forces the segments 15 outward.

Similarly, when the switching valve 2 is switched to the b position, pressure oil flows in from the pressure oil lower of the rotary joint body 5, passes through the hole in the rotary cylinder 9 of the rotary joint header 8, and is sent into the rotary cylinder chamber 11. This pressure oil causes the piston 12 to push the piston rod 13, causing the spreader 14 to move in the axial direction and the segments 15 to contract inward. When unwinding the strip material, the drum is expanded and unwound, so the switching valve 2 is switched to the a position. in this case,
The expansion force of the drum holding the coil 16 is determined by the hydraulic pressure applied to the rotating cylinder rod side chamber 1o. This hydraulic pressure is adjusted by adjusting the pressure reducing valve 3.

FIG. 2 is a hydraulic circuit diagram in which a two-pressure high and low pressure circuit is provided for adjusting the drum expansion force that has been used in the past.

In this case, the drum expansion force can be applied to the rotating cylinder rod side chamber 11 by switching the switching valve 18 between the hydraulic pressure set by the pressure reducing valve 3 and the hydraulic pressure set by the pilot relief valve 19. That is, the pressure reducing valve 3
is set to high pressure, and the pilot relief valve 19 is set to the pressure reducing valve 3.
Set the pressure lower than the set value. When used on the high pressure side, pressure reducing valve 3, switching valve 1 installed at vent port 2o
8 to the a position, the set oil pressure of the pressure reducing valve 3 can be applied.If you want to use the low pressure side, switch the switching valve 18 to the b position and the pent port 20 of the pressure reducing valve 3 can be set to the pilot pressure side. Since it is connected to the relief valve 19, the pressure reducing valve 3 is set to a low hydraulic pressure by the pilot relief valve 19.

An object of the present invention is to provide an unwinding machine that can prolong the life of the drum and prevent deformation and buckling of the small diameter coil.

The expansion force of the unwinding drum is determined by the coil specifications (coil weight, coil outer diameter, etc.) and the unwinding force, assuming that the structure and dimensions of the drum, the friction coefficient of the sliding part inside the drum, and the friction coefficient between the inner surface of the coil and the segments are the same. In each case, the larger the size, the larger the expansion power needs to be. Also, considering the process during winding, as the coil diameter becomes narrower, a smaller expansion force is required. Here, you can input the unwinding conditions (coil outer diameter of the coil used, plate width 9 winding force), detect the coil outer diameter during unwinding with a detector, etc., and enter the value. If a drum expansion force suitable for the conditions can be applied, only the minimum necessary drum expansion force can be applied to the inner surface of the coil. In this way, it is possible to eliminate the drawback of the conventional apparatus in which an excessive drum expansion force is applied that does not match the unwinding conditions.

The present invention uses a pressure regulating valve that can arbitrarily set the fluid pressure applied to the rotating cylinder according to commands given by the control device, and a fluid that provides the optimal drum expansion force by inputting the unwinding conditions and the outer diameter of the coil during unwinding. The problem was solved by providing a control device that calculates the pressure and gives the command value to the pressure regulating valve.

An embodiment of the present invention will be described below with reference to FIG. The expansion/contraction operation of the drum is performed by switching the switching valve 2, as in the conventional case.

The expansion force of the drum is set by setting the hydraulic pressure applied to the rotating cylinder rod side chamber 10 using the pressure regulating valve 21. This pressure regulating valve 21 is connected to the control device 2
It can be arbitrarily set using 40 commands. The control device 24 sets the unwinding conditions 23 (coil outer diameter of the coil used, plate width 9
By inputting the unwinding force, etc.) and the signal from the detector 22 that detects the outer diameter of the coil during unwinding, the optimum drum expansion force is calculated and converted into a command to be given to the pressure regulating valve 21. , This command controls the pressure regulating valve 21 to the optimum oil pressure.

In this way, a drum expansion force suitable for the unwinding conditions is always applied, so that overload on the drum can be prevented and damage on the coil can be avoided.

The relationship between unwinding conditions and drum expansion force will be described. For example, if we look at only the unwinding force and the drum expansion force corresponding to the unwinding force, if the outer diameter of the coil is reduced to one-third, the expansion force will also be one-third, and the tension will be one-half. If the expansion power is also 2
1/1 is enough. On the other hand, the drum expansion force required to hold the coil weight can be reduced if the coil weight is reduced.

Here, we will discuss what kind of harm will occur if the drum expansion force is constant. For example, if the width of the drum is 1/2
If such a drum were used, the expansion force per unit width of the drum would be doubled, and the segments 15 and spreader 14 would be locally subjected to high loads. Therefore, it must be strong enough to withstand localized high loads. Similarly, on the coil side, the load per unit width is doubled, causing damage and deformation of the coil. Even if the coil becomes thinner and the circuit is switched to a low voltage circuit, for example, the same thing can be said as described above, and an ideal drum expansion force can be applied.

According to the present invention, the drum expansion force is applied in accordance with the unwinding conditions, the outer shape of the coil used, the plate width, the unwinding force, and the outer diameter of the coil during unwinding, thereby minimizing the load on the drum. Since the load applied to the inner surface of the coil is kept to the minimum necessary, it is possible to unwind the coil without damaging or deforming the inner surface of the coil, which greatly contributes to improving product yield. .

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view and hydraulic circuit diagram of a conventional unwinding machine, Fig. 2 is a hydraulic circuit diagram using a conventional high and low pressure circuit, and Fig. 3 is a hydraulic circuit diagram of an unwinding machine according to an embodiment of the present invention. be. 2...Switching valve, 4...Check valve, 5...Rotating joint body, 6...Rotating joint body pressure oil port, 7...Rotating joint body pressure oil port, 8...Rotating joint Header, 9.
... Rotating cylinder, 10... Rotating cylinder rod side chamber, 11... Rotating cylinder head side chamber, 12...
・Piston, 13... Piston rond, 14... Spreader 115... Segment, 16... Drum shaft, 17... Unwinding coil, 21... Pressure regulating valve,
22...Coil outer diameter 6

Claims (1)

[Claims] 1. In an unwinding machine that is divided into a plurality of segments in the circumferential direction and each displaces in the radial direction, and in which the expansion and contraction of these segments is performed by a cylinder, the pressure of the fluid supplied to the cylinder in the fluid circuit part The optimal pressure of the fluid is automatically calculated by inputting the pressure control valve that controls the fluid, unwinding conditions such as unwinding force, coil diameter, and plate width, as well as the outer diameter of the coil during unwinding. An unwinding machine characterized by being equipped with a control device that gives commands to a pressure control valve.