JPH09192734A - Hydraulic coiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a hydraulic system and to rapidly avoid the step difference of plate caused by the thickness of a strip. SOLUTION: Bearings of both ends of a wrapper roll 5 to press a strip wound on a mandrel are made to approach and separate to/from the mandrel by two times of strip thickness added with the allowance with a servo cylinder 7 installed on a wrapper frame 3 supported by a swinging fulcrum 4. Then, hydraulic oil charging and discharging holes 4a, 4a installed on a servo cylinder 7 and the swing fulcrum shaft 4 are connected to a hydraulic oil charging and discharging tube 8 composed of a steel tube, the plate step difference can be absorbed by rapidly retreating and advancing the wrapper roll 5 without expanding or contracting a rod 1 of the hydraulic cylinder, and because the small amount of hydraulic oil can be served enough, so the hydraulic system can be miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention When winding a hot rolled material (hereinafter referred to as "strip") into a coil, the present invention can avoid a plate step caused by the plate thickness of the strip at the beginning of winding. Belongs to the technical field of hydraulic coilers.

[0002]

2. Description of the Related Art As is well known, a strip rolled by hot rolling equipment is wound into a coil while being pressed against a mandrel by a plurality of unit rollers of a coiler. Since there is a plate difference corresponding to the thickness, when pressing continuously with each unit roller, when the unit roller comes to the plate step part, a linear pressing striation in the plate width direction of the next few layers of strips Occurs. In order to avoid the occurrence of such pressure streaks, when the respective unit rollers come to the plate step portion, the plate step avoiding device temporarily releases the pressing force of the unit roller to remove the plate step portion. When the time has passed, it is necessary to press again with a predetermined pressing force. As such a hydraulic step coiler having a plate step avoiding device, for example, one disclosed in Japanese Patent Laid-Open No. 4-280754 is known.

An example thereof will be described below with reference to FIG. 5 which is a schematic configuration diagram showing a coiler and its plate level difference avoiding device and FIG. 6 which is an enlarged view of an essential part of FIG. Describing with the same name and the same reference numeral, reference numeral 5 is a strain cage for detecting the amount of rod contraction, and piston rods 1a, 2a, 3a, of the respective hydraulic cylinders 1, 2, 3, 4 are provided.
Two pieces are embedded at a distance of 180 ° in the circumferential direction of the tip portion of 4a, and the detection signal is input to the control panel 80 which calculates the pressing force. The surface is covered with the plastic film 6 or the like. Hydraulic cylinder 1,
2, 3, 4 are pivotally attached to the housing 79, and the piston rods 1a, 2a, 3a, 4a are pivotally attached to the frames 56, 57, 58, 59, respectively.

Next, the operation mode of the coil level difference avoiding device having the above structure will be described. The unit rollers 51, 52, 5 are formed by the respective hydraulic cylinders 1, 2, 3, 4.
3, 54 are pressed by the mandrel 70 with a predetermined pressing force,
Strip S fed from a hot finish rolling mill (not shown)
Is guided by the guide frame 71, and its tip is the first
The unit roller 51 and the mandrel 70 sandwich the unit roller 51 and start winding. The amount of contraction of each piston rod 1a, 2a, 3a, 4a caused by this pressing force is detected by each strain gauge 5 and transmitted to the control panel 80. Each unit roller 5 by the control panel 80
The pressing force of 1, 52, 53, 54 is calculated, and the hydraulic cylinders 1, 2, 3, 4 are controlled via the hydraulic unit 85 so that the pressing force is maintained at a predetermined value.

When the leading end of the strip S reaches the position of the first unit roller 51 due to the winding of the second layer, the control panel 80 retracts the piston rod 1a of the hydraulic cylinder 1 by a preprogrammed time lag. The pressing by the first unit roller 51 is released, and immediately after passing, the piston rod 1a is pushed out and the pressing is started.
Hereinafter, each hydraulic cylinder is similarly controlled. When the winding is further advanced and the coil C of the strip S reaches a predetermined number of turns, the plate step at the leading end of the strip S has no effect, so that the respective unit rollers 51, 52,
The control of releasing and returning the pressing by 53 and 54 is stopped, and the strip S is constantly pressed and wound on the mandrel 70.

[0006]

In the coil step difference avoiding device according to the conventional example, the control panel stores the contraction amount of the piston rod of the hydraulic cylinder for actuating the pressing unit roller (hereinafter referred to as the wrapper roll). When the pressure exceeds a certain value, the piston rod of the hydraulic cylinder is contracted through the hydraulic unit to reduce the pressing force.However, when the pressing force becomes smaller than the predetermined value due to the reduction of the piston rod, the strain gauge changes the piston rod. The amount of contraction is detected and transmitted to the control panel to extend the piston rod to increase the pressing force to quickly reduce the difference between the pressing force and the specified value. This is excellent because the pressing force due to quickly reaches a predetermined value. However, this has a problem to be solved as described below.

That is, since the wrapper roll according to the above conventional example is directly attached to the frame (hereinafter referred to as the wrapper frame) via the bearing, the piston rod of the hydraulic cylinder for swinging the wrapper frame expands and contracts. Operation is controlled by a hydraulic servo system. That is, in order to operate a large-capacity hydraulic cylinder that swings the wrapper frame that supports the wrapper roll, a high-response and large-capacity (large-sized) hydraulic servo system must be used, which is disadvantageous in terms of equipment cost. . In order to solve such a problem, it is considered that, for example, the hydraulic cylinder may be a servo type. However, the expansion and contraction length of the piston rod of the hydraulic cylinder is long, a large amount of hydraulic oil needs to be supplied and discharged, and a large diameter flexible hose must be used, which adversely affects the responsiveness of the servo (due to the expansion and contraction of the inner diameter of the hose). ), It becomes difficult to secure high responsiveness, and therefore such means cannot be adopted.

[0008] Therefore, an object of the present invention is to provide a hydraulic coiler having a small hydraulic system and capable of quickly avoiding a plate step due to the thickness of the strip at the beginning of winding. It is in.

[0009]

In order to solve the above problems, the main means adopted by the hydraulic coiler according to claim 1 of the present invention is a swinging fulcrum shaft 4 which is rotatably supported.
A plurality of wrapper frames 3 each having one end side supported by a wrapper roll 5 provided on the other end side are individually swung by the respective hydraulic cylinders 1 with the swinging fulcrum shaft 4 as a fulcrum, and the wrapper rolls 5 perform hot stripping. In the hydraulic coiler that winds the hot strip S around the mandrel 6 while pressing S, the servo cylinder 7, which supports the bearings 5a, 5a provided on the wrapper frame 3 and supporting both ends of the wrapper roll 5,
7 and the swing support shaft 4 on the servo cylinders 7, 7.
And a hydraulic oil supply / discharge pipe 8 that communicates with each other.

The main means adopted by the hydraulic coiler according to claim 2 of the present invention is that in the hydraulic coiler according to claim 1, the hydraulic oil supply / discharge pipe 8 is made of a metal tube. Characterize.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The inventors have found that the number of turns of the strip is 0.
From servo control of a large-capacity hydraulic cylinder that swings the raper frame until the number of turns reaches a predetermined number of turns, this hydraulic cylinder is set to normal hydraulic control and only the wrapper roll is servo-controlled. The stroke of the cylinder to be operated is 2 of the strip thickness.
Double + α (margin allowance) is sufficient, and the amount of hydraulic oil supplied and discharged is small, so it is possible to make the hydraulic oil supply and discharge pipes thinner, resulting in a smaller hydraulic system and its responsiveness. The present invention is based on the idea that the above can be easily improved.

Hereinafter, a hydraulic coiler according to an embodiment of the present invention will be described with reference to FIG. 1 for explaining the overall structure thereof, and FIG. 2 for showing a wrapper frame supporting a wrapper roll from the mandrel side, and FIG. 3, which is a sectional view taken along the line A-A of FIG. 3, and FIG. 4 which is a relationship diagram of the stroke variation of the servo cylinder with respect to the number of turns in the initial stage of the strip, reference numerals 1, 1, 1 respectively indicate cylinders. A trunnion type hydraulic cylinder that is swingably supported by support brackets 2, 2, 2.
The tips of the rods 1a, 1a, 1a of 1, 1 are pivotally attached to respective wrapper frames 3, 3, 3 described later.

One end side of the wrapper frames 3, 3, 3 is equidistantly arranged on a circle centered on the radial center of the mandrel 6 and is rotatably supported. The guide frame G is provided on the side facing the outer peripheral surface of the mandrel 6 while being supported by 4, 4, and 4, respectively.
Wrapper rolls 5, 5 and 5 which are guided and fed by and are pressed against the mandrel 6 for winding the strip S wound in a coil shape are attached. The bearings 5a fitted on both ends of the wrapper rolls 5, 5 and 5 are moved closer to the mandrel 6 by twice the plate thickness of the strip S + α (margin allowance) by the servo cylinders 7 and 7, respectively. It is supported so that it can be separated.

As shown in FIGS. 2 and 3, the servo cylinder 7 is made of a steel pipe for supplying working oil from the swing fulcrum shaft 4 to the servo cylinder 7 and discharging working oil from the servo cylinder 7. A pair of hydraulic oil supply / discharge pipes 8, 8 communicate with each other. The swing fulcrum shaft 4 has hydraulic oil supply / discharge holes 4a, 4a.
a is provided, and a hydraulic oil supply / discharge hose 9 is connected to each of the hydraulic oil supply / discharge holes 4a, 4a. Accordingly, the hydraulic oil is supplied to the servo cylinder 7 through the hydraulic oil supply / discharge hose 9, the hydraulic oil supply / discharge hole 4a, and the hydraulic oil supply / discharge pipe 8, while the hydraulic oil in the servo cylinder 7 is supplied / discharged. The oil is discharged through the pipe 8, the hydraulic oil supply / discharge hole 4a, and the hydraulic oil supply / discharge hose 9.

The rocking fulcrum shaft 4 and the servo cylinder 7 can be communicated with each other by the hydraulic oil supply / discharge pipe 8 made of a steel pipe because the wrapper frame 3 is fixed to the rocking fulcrum shaft 4. Therefore, the positional relationship between the swing fulcrum shaft 4 and the servo cylinder 7 is kept constant regardless of the swing angle of the wrapper frame 3.

By supplying and discharging such hydraulic oil, the wrapper roll 5 approaches and separates from the mandrel 6 via the bearings 5a, 5a. Reference numeral 10 is a cooling water supply pipe, and the cooling water supply pipe 10 is provided with cooling water supplied from a cooling water supply hose 11 on a swing fulcrum shaft 4 and a hydraulic cylinder position. Water is supplied through the detection signal wiring hole 4b. Reference numeral 12 is a greasing hose for supplying lubricating oil, and reference numerals 9a, 11a and 12a are swivel joints.

The operation mode of the hydraulic coiler having the above-mentioned structure will be described below. Each hydraulic cylinder 1, 1,
By the extension of the rods 1a, 1a, 1a of 1, the wrapper rolls 5, 5, 5 are pressed against the mandrel 6 with a predetermined pressing force, and the strip S fed from the hot finish rolling machine (not shown) is guided by the guide frame G. It is guided, and its tip end is nipped by the wrapper roll 5 and the mandrel 6 and the winding is started. The hydraulic cylinders 1, 1, 1 are controlled so that the pressing force applied to the mandrel 6 by the wrapper rolls 5, 5, 5 has a predetermined value. However, the hydraulic coiler according to the present embodiment is controlled by supplying / discharging hydraulic fluid from the hydraulic system by detecting the servo cylinder position by a cylinder built-in position detector such as Silnak and detecting the plate level difference by another sensor. The servo rolls 7, 7 are configured so that the wrapper roll 5 can be moved toward and away from the mandrel 6 by twice the plate thickness of the strip S + α (margin allowance).

Therefore, as shown in FIG. 4, at the beginning of winding, the wrapper roll 5 has a plate thickness of the strip S (2 mm).
The amount of addition of α to twice the value of α causes the plate S to retreat abruptly to absorb the plate step, and immediately after that, the strip S is maintained at the same displacement amount until approaching and one winding is completed, and the strip S is pressed with a predetermined pressing force. Continue to press. Then, the same operation as above is performed at the beginning of the second winding and the beginning of the third winding. Of course, all three wrapper rolls 5, 5, 5 are similar. Thus, 3
When the strip S is wound up to about 10 turns, the influence of the plate step of the strip S is reduced, so the control of the servo cylinders 7, 7 is stopped and the rods 1a, 1a, 1a of the hydraulic cylinders 1, 1, 1 are removed. While reducing the number of turns of the strip S so as not to interfere with the number of turns, the wrapper rolls 5, 5 and 5 are moved to the open limit and wound up to the final number of turns to obtain a coil of the strip S without a pressure ridge. be able to.

[0019]

EXAMPLE A hydraulic coiler according to an example of the present invention will be described below. Outer diameter × inner diameter × stroke is 224 mm ×
160 mm x 1500 mm hydraulic cylinder 1 is used, and outer diameter x inner diameter x stroke is 75 mm x 60 mm x
A hydraulic coiler according to the present embodiment using a 30 mm servo cylinder 7, and an outer diameter × inner diameter × stroke of 224 mm
The plate thickness is 2 mm in order to compare the amount of oil supplied and discharged for absorbing the plate step difference of the strip S with a hydraulic coiler that controls a hydraulic cylinder 1 of × 160 mm × 1500 mm by a hydraulic system similar to the conventional example, 4mm, 6mm, 8m
A winding test of strips S of m, 10 mm and 12 mm was conducted. Table 1 shows the amount of hydraulic oil required to operate one hydraulic cylinder and two servo cylinders by twice the plate thickness of the strip S + α (margin allowance).

[0020]

[Table 1] According to Table 1 above, the amount of hydraulic oil is about 1/7 of the conventional example, and the capacity of the hydraulic system is 1/7 of that of the conventional example. Further, in this embodiment, since the steel pipes are used for the pair of hydraulic oil supply / discharge pipes 8, 8, the hydraulic oil is hardly expanded or contracted due to the change in the pressure of the hydraulic oil, and the hydraulic oil supply amount is small. Since the diameter of the exhaust pipe 8 can be reduced, the servo response is excellent.

Therefore, it is not necessary to use a hydraulic servo system of high response and large capacity (large size) as in the conventional case, which is advantageous in terms of equipment cost. Of course, even if a conventional flexible hose is used for the hydraulic oil supply / discharge pipes 8 and 8,
Since the diameter of the flexible hose can be reduced, there are some effects in downsizing the hydraulic system and improving servo response. The reason why the inner diameter of the servo cylinder 7 can be made smaller than the inner diameter of the hydraulic cylinder 1 is that the hydraulic cylinder 1 must operate the wrapper frame 3 and the wrapper roll 5, while the servo cylinder 7 must be operated.
Is because only the wrapper roll 5 needs to be operated.

Further, as described above, the rod 1a of the hydraulic cylinder 1 increases as the number of turns of the strip S increases.
Although it is reduced according to the plate thickness of the strip by a normal hydraulic system, since the rod 1a of the hydraulic cylinder 1 does not need to be rapidly expanded and contracted to absorb the plate step of the strip S, the capacity of the normal hydraulic system is The capacity can be much smaller than that of the conventional hydraulic servo system.

In the above, the three wrapper rolls 5 are used.
However, the technical idea of the present invention can be applied to a coiler plate level difference avoiding device according to a conventional example having four unit rollers corresponding to the wrapper roll 5. Therefore, the number of the wrapper rolls 5 is not limited, and design changes and the like can be freely made within the scope not departing from the technical idea.

[0024]

As described in detail above, claim 1 of the present invention
According to the hydraulic coiler according to the second aspect, the plate step due to the plate thickness of the strip is not absorbed by adjusting the pressing force of the wrapper roll via the wrapper frame by the hydraulic cylinder as in the conventional case. The servo cylinder, which is smaller than the hydraulic cylinder that supports the wrapper roll, adjusts and absorbs the stroke of the wrapper roll, and a small amount of hydraulic oil is required to absorb the level difference of the plate, which enables downsizing of the hydraulic system. At the same time, the hydraulic oil supply / discharge pipe of the servo cylinder can be made smaller in diameter,
Since the amount of expansion / contraction of the hydraulic oil supply / discharge pipe due to pressure fluctuation is small, there is an excellent effect that the response of the servo is also improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration explanatory diagram of a hydraulic coiler according to an embodiment of the present invention.

FIG. 2 is a front view of a wrapper frame that supports a wrapper roll as seen from the mandrel side according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a relational diagram of the stroke transition of the servo cylinder with respect to the number of turns in the initial stage of the strip.

FIG. 5 is a schematic configuration diagram showing a coiler and a plate level difference avoiding device thereof according to a conventional example.

FIG. 6 is an enlarged view of a main part of FIG. 5;

[Explanation of symbols]

1 ... Hydraulic cylinder, 1a ... Rod, 2 ... Cylinder mounting bracket, 3 ... Wrapper frame, 4 ... Oscillating fulcrum shaft, 4
a ... Hydraulic oil supply / discharge hole, 4b ... Cooling water supply and hydraulic cylinder position detection wiring hole, 5 ... Wrapper roll, 5a ... Bearing,
6 ... Mandrel, 7 ... Servo cylinder, 8 ... Hydraulic oil supply / discharge pipe, 9 ... Hydraulic oil supply / discharge hose, 9a ... Swivel joint, 10 ... Cooling water supply pipe, 11 ... Cooling water supply hose, 1
1a ... swivel joint, 12 ... greasing hose, 12a
… Swivel joint.

Claims (2)

[Claims] 1. A swinging fulcrum shaft 4 which is rotatably supported.
A plurality of wrapper frames 3 each having one end side supported by a wrapper roll 5 provided on the other end side are individually swung by the respective hydraulic cylinders 1 with the swinging fulcrum shaft 4 as a fulcrum, and the wrapper rolls 5 perform hot stripping. In the hydraulic coiler that winds the hot strip S around the mandrel 6 while pressing S, the servo cylinder 7, which supports the bearings 5a, 5a provided on the wrapper frame 3 and supporting both ends of the wrapper roll 5,
7 and the swing support shaft 4 on the servo cylinders 7, 7.
And a hydraulic oil supply / discharge pipe 8 communicating with the hydraulic coiler. 2. The hydraulic coiler according to claim 1, wherein the hydraulic oil supply / discharge pipe 8 is made of a metal tube.