JPS6122652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel strip winding device having a mandrel that can expand and contract the steel strip winding diameter and a lapper roll that guides the winding of the mandrel at the beginning of winding. However, it is possible to advantageously prevent slipping of the mandrel, prevention of top marks at the tip of the steel strip, and prevention of netting during the initial stage of winding the steel strip.

The steel strip winding device conventionally uses a mandrel and a mandrel, in which only the steel strip winding diameter (maximum diameter) and the extractable diameter (minimum diameter) of the coiled steel strip can be changed by a simple reciprocating operation of a hydraulic cylinder. , which is constructed of a steel strip tip guide that is moved to a predetermined position around the mandrel at the initial stage of winding the steel strip and guides the steel strip to the outer periphery of the enlarged-diameter mandrel, and a wrapper roll that performs winding. For example, in a continuous hot rolling machine, since steel strips of various sizes are rolled, if the winding diameter of the mandrel and the wrapper roll guide position of the steel strip winding machine are fixed, the strips, top marks, and nettings are fixed. It is impossible to eliminate them all. In other words, if the winding positions of the wrapper roll and constant-diameter mandrel (Fig. 1b) are fixed to the winding of the thin steel strip, the impact force and tightening force will become stronger when winding the thick steel strip.
As shown in the figure, the mandrel rotational speed b _v sharply matches the steel strip speed S _v , which inevitably causes netting and top marks, and when the mandrel is fixed to the winding of a thick steel strip, the speed of the mandrel becomes larger than necessary when winding a thin steel strip. Loose winding with many scratches and scratches, accompanied by a slip phenomenon,
This results in coils with extremely poor winding appearance, such as telescope winding.

Recently, in an attempt to solve this problem, in order to be able to mechanically expand and change the diameter of the mandrel in two stages, the hydraulic cylinder for driving the expansion and contraction of the mandrel has been made into a double cylinder structure that can perform two-stage motion, or it can be moved within the hydraulic cylinder. There is a model with an internal stopper, but compared to the previous model, this allows the mandrel diameter at the initial stage of steel strip winding to be adjusted to 2 for various steel strip properties.
The first step is to select the type and change the selected diameter.
As shown in Figure a, the curve is only fixedly variable in two steps, and the curve where the mandrel rotational speed A _v matches the steel strip speed S _v is slightly slack, and the problems of slips, top marks, and netting are slightly alleviated. It's just that, so we can't expect much. In this case, problems of accuracy due to mechanical play and new manufacturing and maintenance problems arise due to the complicated structure.

The present invention provides an excellent steel strip winding device that advantageously solves these problems, and its features are as shown in the embodiments shown in FIGS. 2 to 5. a mandrel 1 in which a hydraulic cylinder 1b serves as a radial expansion/contraction drive device 1a;
In a steel strip winding device having a lapper roll 2 that guides the steel strip winding onto the mandrel 1,
First, a diameter detector 3 that detects the diameter of the mandrel 1, a diameter setting command device 6'-1 that sets the diameter of the mandrel, a hydraulic servo valve 5 provided in the hydraulic circuit 4 of the hydraulic cylinder 1b, and the diameter. A servo valve control device 7 that controls the hydraulic servo valve 5 using a detection signal φ _a from the detector 3 and a diameter setting signal φ ₀ (φ _v or φ ₁ to φ _o ) from the diameter setting command device 6'-1. Secondly, the diameter detector 3, the hydraulic servo valve 5, steel strip property signals (thickness signal t, width signal W, temperature signal T, material signal C, etc.) and/or the steel strip property signal (thickness signal t, width signal W, temperature signal T, material signal C, etc.) Introducing band winding status signals (winding tension signal St, seaming force signal Su, impact force signal Si, etc.) or at least a mandrel diameter setting command signal at the initial stage of steel band winding in response to the steel band winding process. A setting command device 6a that transmits φ ₀ (φ _v or φ ₁ to _{φ o} ) (pattern examples are shown by curves CP _a and CP _p in FIG. 1) A diameter detection signal from the diameter detector 3 φ _a and the setting command signal φ ₀ from the diameter setting command device 6a
(φ _v or φ ₁ to _{φ o} ) and a servo valve control device 7 for controlling the hydraulic servo valve.

That is, in the present invention, the mandrel diameter can be set at the initial stage of steel strip winding by controlling the hydraulic cylinder 1b for expanding and contracting the mandrel diameter using the diameter detector 3, hydraulic servo valve 5, and servo valve control device 7. The fixation or its change can be done continuously or as desired, for example, as shown in curve CP _a in Figure 1, depending on the properties of the steel strip and by taking into account the preset or detected steel strip winding situation, either manually or automatically. This can be done in multiple stages, thereby buffering and guiding the tip of the steel strip S between the mandrel 1 and the wrapper roll 2, and adjusting the rotational speed of the mandrel 1 appropriately to the steel strip speed _Sv . approach (Fig. 1 curve)
CPv _a , CPv ₀ ). In other words, this prevents the generation of buckled marks, that is, top marks, in the portion overlapping the tip of the steel strip, and minimizes the slip phenomenon between the outer periphery of the mandrel, the tip of the steel strip, and the lapped portion of the steel strip. At this time, the mandrel winding force of the steel strip smoothly matches the mandrel rotation speed to the steel strip speed, and netsuking (the steel strip winding around the mandrel occurs steeply, resulting in abnormally high tension in the steel strip) It is possible to reliably prevent the occurrence of width shrinkage fluctuations due to the addition of wires, and to obtain high-quality coils with no slip flaws, width fluctuations, top marks, or poor winding appearance, resulting in smooth and highly productive steel strips. This allows the winding operation to be maintained. Embodiments of the present invention will be described below with reference to the drawings.

Each of the embodiments shown in FIGS. 3, 4, and 5 is an example applied to a steel strip winding device in a hot rolling facility shown in FIG. 2. The example of the steel strip winding device shown in FIG. 2 winds up the steel strip S introduced via the guide G from the pinch roll PR provided at the outlet end of the hot run table HT, and the mandrel 1 is wound around the outer periphery. Three arc-shaped segments 1a are mounted so as to be movable in the radial direction, and the tapered surfaces of the segments 1a are engaged with the taper on the inner circumferential surface of the segment 1a, and the segments are mounted so as to be movable forward and backward in the axial direction of the mandrel. The main structure includes a wedge 1c and a hydraulic cylinder 1b in which the tip of a piston rod 1b' is connected to the rear end of the wedge 1c. It is composed of an arcuate guide plate 2b fixed to the body 2c and a hydraulic cylinder 2d that rotationally drives the frame 2c.

In the embodiment shown in FIG. 3, the diameter detector 3 of the mandrel 1 detects the forward and backward positions of the piston 1b'' of the hydraulic cylinder 1b based on the movement position of the dummy rod 1b connected to the rear end of the piston 1b''. This is changed to the radial movement position of segment 1a, and the diameter detection signal φ _a of mandrel 1 is outputted.
This is introduced into the servo valve control device 7. The servo valve control device 7 controls the hydraulic circuit 4 of the hydraulic cylinder 1b.
It controls the hydraulic servo valve 5 installed in the mandrel winding diameter setting signal φ automatically or manually in advance and immediately before the start of steel strip winding and at the beginning of steel strip winding.
₀ , φ ₁ to φ _o , operate the hydraulic servo valve 5 while comparing with the detection signal φ _a from the diameter detector 3 each time, and set the hydraulic cylinder 1b at the position where the mandrel diameter is as set. The piston 1b'' position is accurately and quickly shifted, and the position after the shift is maintained at a predetermined pressure.The diameter setting section 6' sets the diameter setting before the start of winding to the initial value φ ₀ , that is, the mandrel 1 Depending on the relative holding force (radial spring rigidity) with the wrapper roll 2a, the gap between the guide plate 2b and the outer peripheral surface of the mandrel 1, and the properties of the steel strip S, the mandrel diameter is set to a value that can prevent top mark and netting. Diameter setting command device 6' for manual setting
1. In addition, the setting section 6' has a function of changing the diameter setting φ ₀ at the initial stage of steel strip winding according to the winding progress from the time when the steel strip starts winding around the mandrel. A diameter setting command device 6 that automatically or automatically performs continuous variable setting φ _v over time or multi-stage variable setting φ ₁ to _{φ o} over time, and enlarges and changes the diameter of the mandrel to a steady winding diameter φ _o at a predetermined speed. '-2.

The embodiment shown in FIG. 4 is an embodiment of a configuration that includes the example in FIG. This is automatically performed by the command device 6a. The diameter setting command device 6a inputs the temperature signal T, material signal C, width signal W, and thickness signal t of the steel strip to be wound from the computer CPu before each steel strip winding operation, and inputs the temperature signal T, material signal C, width signal W, and thickness signal t of the steel strip to be wound from the computer CPu. Calculate the mandrel diameter φ ₀ at which the steel strip tip guide gap and spring rigidity formed by the above-mentioned optimal values and send a setting command to the servo valve control device 7, and the steel strip tip enters between the mandrel and the wrapper roll. After a predetermined period of time after introducing the current detection signal R _ON , the mandrel diameter enlargement variable setting is calculated based on the steel strip winding tension signal St, which has been introduced in advance or actually measured, and the steel strip property signal (W, t, C, T). Based on the pattern, a setting command signal (φ _v or φ ₁ to _{φ o} ) is sent to the servo valve control device 7 continuously or in multiple stages over time. As a result, the variable diameter pattern at the initial stage of winding is determined by the curve CP _a in Figure 1.
The desired mandrel spring stiffness pattern is obtained by controlling the mandrel spring stiffness pattern, and the mandrel rotation speed is controlled in the optimum pattern vicinity range (within the curve CP _va in Figure 1).
It is something that can be stored in Reference numeral 8 indicated by a dashed line in FIG. 4 is a hydraulic pressure control valve interposed in the hydraulic circuit 4 between the hydraulic power source 9 and the hydraulic servo valve 5.
This is provided when the hydraulic pressure control function of the hydraulic servo valve 5 is insufficient, and the diameter setting command signal φ ₀ (φ _v or φ
₁ to φ _o ), and the hydraulic pressure variable setting command device 6b, which operates based on this, outputs a hydraulic pressure command signal P ₀ (P
_v or P ₁ to P _o ).

The embodiment shown in FIG. 5 is another embodiment having the second feature, including the main parts of the embodiment in FIG. In addition, the change in the actual mandrel spring stiffness Ka is measured by the tightening force and impact force △F at the initial stage of steel strip winding, and the required correction value △φ of the mandrel diameter is determined according to the ratio of this to the desired value _K0 . By feeding back to the servo valve control device 7 and correcting the set value, the variable diameter pattern at the initial stage of winding is controlled as shown in the curve CP ₀ in Figure 1 to obtain the desired mandrel spring stiffness pattern and to obtain the optimum mandrel rotation. This provides a speed approach (curve CP _v0 in Figure 1) and completely prevents slips, top marks, and netting. In addition to the diameter setting command device 6a and the oil pressure setting command device 6b, the setting command section 6 has a spring stiffness variable command device 6c in the mandrel radial direction. The variable spring stiffness command device 6 inputs the property signals (T, W, t, C) of the steel strip, and uses the signals to control the mandrel to ensure that no marks, unreasonable slipping, or netting occur after the start of winding. The comparator 9 calculates the spring stiffness variable pattern in the expanding direction and calculates the spring stiffness value K ₀ that is variable over time based on this pattern.
Sequential commands are sent to The comparator 9 introduces and compares the K ₀ with the actual measurement value Ka from the measuring device 10, calculates a required mandrel diameter correction value Δφ, and introduces this into the servo valve control device 7 to perform correction control. The measuring device 10 measures and calculates the mandrel spring stiffness Ka by introducing the impact force and the seaming force ΔF at the initial stage of winding from the front and rear hydraulic pressure difference detector 11 of the hydraulic cylinder 1b.

Incidentally, the impact force and the seaming force ΔF can be detected by other suitable means such as disposing a load cell or the like inside the segment 1a, in addition to the above example.

The diameter detector 3 shown in each of the examples of FIGS. 3, 4, and 5 is the same example, but in addition to this, the expansion and contraction of the mandrel diameter is detected by a projecting device, or the mandrel radius of the segment 1a is detected. Any other appropriate detection means may be employed, such as providing a segment position detector on the piece that guides the directional movement.

[Brief explanation of the drawing]

FIG. 1 is a graph showing a conventional mandrel winding diameter setting pattern, a continuously variable mandrel winding diameter setting pattern made possible by the device of the present invention, and changes in mandrel rotational speed due to these in relation to steel strip speed. FIG. 2 is an explanatory view showing the main structure of a steel strip winding device to which the present invention is applied, and FIGS. 3 to 5 are explanatory views showing each embodiment of the present invention. In the figure, 1...mandrel, 1a...segment, 1b...hydraulic cylinder, 2...wrapper roll, 3...diameter detector, 5...hydraulic servo valve, 6...setting command section, 7...servo valve control device, 6a...diameter setting command Device, 6b... Oil pressure setting command device, 6c... Spring stiffness variable command device.

Claims (1)

[Scope of Claims] 1. A steel strip winding device having a mandrel in which a hydraulic cylinder is used as a driving device for radially expanding and contracting segments, and a wrapper roll that guides winding of the steel strip onto the mandrel, wherein the diameter of the mandrel is a diameter detection device for detecting, a diameter setting command device for setting the diameter of the mandrel, a hydraulic servo valve provided in the hydraulic circuit of the hydraulic cylinder, a detection signal from the diameter detector and a diameter setting command signal from the diameter setting command device. A steel strip winding device characterized in that a servo valve control device for controlling the hydraulic servo valve is provided. 2. A steel strip winding device having a mandrel whose radial expansion/contraction drive device is a hydraulic cylinder, and a wrapper roll that guides the winding of the steel strip onto the mandrel, comprising: a diameter detector for detecting the diameter of the mandrel; a hydraulic servo valve provided in the hydraulic circuit of the hydraulic cylinder; a diameter setting command device that sets the mandrel diameter in accordance with the steel strip winding process; a diameter detection signal from the diameter detector and settings from the diameter setting command device; The steel strip winding device according to claim 1, further comprising: a servo valve control device for introducing a command signal and controlling the hydraulic servo valve. 3. Claim 2, characterized in that it has a diameter setting command device that introduces a steel strip property signal and/or a winding status signal and sets the diameter of the mandrel in accordance with these and the steel strip winding process. The steel strip winding device described.