JPS6135281Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a down coiler for a hot strip mill.

[Technical background of the invention and its problems]

In down coilers, the thickness of the strip to be wound varies, and it is necessary to adjust and set the standby gap (gap) in consideration of the initial threading of these strips.

Conventionally, the above-mentioned gap adjustment has been carried out by adjusting the thickness of the sheet that is wound around the outer periphery of the mandrel 1 (a cylindrical member around which the strip 2 is wound, consisting of 3 to 4 segments), as shown in Figure 1. The wrapper roll 3 of the swing arm 4 disposed outside the mandrel 1 is moved by the swing arm operation, and the gap G between the wrapper roll 3 and the mandrel 1 is fixed. This was done by adjusting the.

In the figure, reference numeral 5 indicates a guide apron provided on each swing arm 4, reference numeral 6 indicates a pressing cylinder for opening and closing each swing arm 4, and reference numeral 7 indicates a gap adjustment device.

However, in the down coiler having the structure described above, when adjusting the gap at the first threading stage of winding the strip 2, the larger the thickness of the strip, the more difficult the guide is to the gap G between the wrapper roll 3 and the mandrel 1. The gap between the apron 5 and the mandrel 1 is enlarged due to the structure, and the guiding condition for the strip 2 passing becomes poor. (It may fly out from the mandrel 1 without being touched)
This problem arises. Further, in the conventional gap adjusting device, it is necessary to individually set the positions of a plurality of wrapper rolls disposed outside the mandrel, so that the same number of gap adjusting devices as the number of wrapper rolls are required, making the equipment complex.

[Purpose of invention]

This invention allows the gap adjustment of multiple wrapper rolls to be performed with a single gap adjustment device, and also allows the gap adjustment at the initial threading stage of winding the strip to be performed by keeping the waiting position of the wrapper rolls outside the mandrel at a constant position. In the stationary state,
It is an object of the present invention to provide a down coiler that can be easily and accurately controlled by controlling the outer diameter of the mandrel so as to maintain it at an arbitrary diameter.

[Summary of the idea]

In order to achieve the above-mentioned object, this invention has developed a hot strip roll comprising a mandrel having an expandable and contracting structure for winding the strip, and a plurality of wrapper rolls disposed outside the mandrel and opened and closed by actuating devices as appropriate. In a down coiler for a mill, there is a mandrel expansion/contraction mechanism that arbitrarily expands or contracts the outer diameter of the mandrel using an operating cylinder, and the mandrel is moved to a threading standby position by detecting the amount of movement of the operating cylinder of this mandrel expansion/contraction mechanism. It is characterized by being provided with a device for stopping the expansion/contraction operation cylinder so as to maintain the diameter when the diameter is expanded or contracted to a position where a predetermined threading gap is formed between the cylinder and the wrapper roll placed in the cylinder. That is.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings in FIGS. 2 to 5. 11 in the figure is strip 1
A mandrel 14 having an expandable structure for winding up the mandrel 11 is a first swing arm disposed on one side of the mandrel 11 so as to be opened and closed laterally with the upper end fulcrum 13 as a fulcrum. The opening/closing mechanism is comprised of a cylinder 23 supported by a pin 22 on a base support 21. 1
Reference numeral 6 designates a second swing arm that is pivotally attached to the lower end bracket 14a of the first swing arm 14 and is operated to open and close using the lower end support shaft 15 as a fulcrum, and the opening and closing operation device for this second swing arm 16 is as follows:
Pin 2 between the first and second swing arms 14 and 16
It consists of a cylinder 26 connected by 4 and 25.

17 and 18 are wrapper rolls provided on the first swing arm 14 and the second swing arm 16 so as to guide the strip 12 at a position above the mandrel center O; 19 and 20 are wrapper rolls provided on the strip 12 between the wrapper rolls 17 and 18; a guide apron provided on the first and second swing arms 14, 16 to guide the
Reference numeral 28 designates an entrance guide for the strip 12, which is used to connect the first and second swing arms 14, 1 when the strip 12 is completely wrapped around the mandrel 11.
When the strip 6 is opened and retracted laterally as shown by the imaginary line in FIG. 2, the strip 12 is opened to an outer position outside the final winding diameter d.

Then, the strip 12 is attached to the mandrel 11.
When wrapping the strip around the mandrel 11, a gap G corresponding to the thickness of the strip plate is formed in advance between the mandrel 11 and the wrapper rolls 17, 18 as shown in FIG. This is carried out by keeping the initial sheet passing standby position at a fixed position, and expanding or contracting the outer diameter of the mandrel 11 while the wrapper roll is stationary. For this reason, the mandrel 11 has an expanding and contracting structure,
The mandrel expansion/contraction mechanism 29 includes a mandrel 11 that is composed of several expansion/contraction segments divided in the circumferential direction.
The diameter of the mandrel 1 is expanded or contracted by moving the expansion/contraction rod 31 forward and backward using the operating cylinder 30 shown in FIG.
The mandrel expansion/contraction mechanism is different from conventionally known mandrel expansion/contraction mechanisms in that the first expansion/contraction operation maintains the outer diameter of the mandrel at an arbitrary diameter between the expansion limit and the contraction limit. This is because the known mandrel expansion/contraction is performed in two steps of expansion←→contraction for the purpose of removing and removing the strip coil, whereas in this invention, the gap G is adjusted by the expansion/contraction operation of the mandrel 11, so this expansion/contraction operation is The mandle outer diameter is controlled to be maintained at an arbitrary diameter between the expansion limit and the contraction limit.

Therefore, this invention is based on the mandrel expansion/contraction mechanism 2.
The amount of rod movement of the actuating cylinder 30 of No. 9 is detected by a detector 32, and the mandrel 11 is expanded or contracted in diameter to match a predetermined gap setting value G based on the detection signal of this detector 32. At times, the mandrel 11 is configured to stop expanding and contracting in order to maintain its diameter. That is, the detector 32 may be a sensor as shown in FIG.
The sensor as shown in FIG. 5 detects the amount of movement of the piston rod of the wrapper roll 17, 1 where the mandrel 11 is fixed at the initial sheet passing standby position.
When the cylinder 30 is expanded or contracted to a position where a predetermined gap G is formed between the cylinder 30 and the plate 8, the cylinder 30 for expansion/contraction operation is stopped (for example, the solenoid valve 35 of the hydraulic circuit shown in FIG. 5 is closed). control so that Reference numerals 34 and 35 shown in FIG. 5 indicate solenoid valves incorporated in the hydraulic circuit of the cylinder 30, and arrow F shown in FIG. indicates the direction of the force acting on the

[Effect of idea]

The down coiler of this invention has the structure described above, and the gear adjustment at the initial threading stage of winding the strip is performed in a stationary state with the wrapper roll outside the mandrel at a fixed standby position, and the mandrel outer diameter This is done by controlling the diameter to an arbitrary diameter, so the gap adjustment can be done easily and accurately, and there is no need to adjust the gap of multiple wrapper rolls, making it possible to make the device lighter and smaller, and maintenance is also very easy. become. Moreover, the outer diameter of the mandrel in the expansion/contraction structure is controlled to a predetermined gap setting position by detecting the movement amount of the actuating cylinder of the mandrel expansion/contraction mechanism with a detector, so the gap can be adjusted in response to changes in strip thickness. This has the effect of allowing you to do it freely.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the general structure of a conventional down coiler, Fig. 2 is an explanatory diagram of the overall configuration of an embodiment of the down coiler of this invention, and Fig. 3 shows the strip biting state of the down coiler. The operation explanatory diagrams shown in FIGS. 4 and 5 are schematic explanatory diagrams of different embodiments showing the mandrel expansion/contraction mechanism and the detection means related thereto. 11...Mandrel, 12...Strip, 1
4...First swing arm, 16...Second swing arm, 17, 18...Ratsupar roll, 23
...Press cylinder for operating the first swing arm,
26... Pressing cylinder for operating the second swing arm, 29... Mandrel expansion/contraction mechanism, 30... Cylinder for mandrel expansion/contraction operation, 31... Expansion/contraction rod, 32... Detector, G... Gap.

Claims (1)

[Scope of utility model registration request] A mandrel with an expandable structure for winding the strip,
In a down coiler for a hot strip mill, which is equipped with a plurality of wrapper rolls arranged outside the mandrel and opened and closed by an actuating device, the outer diameter of the mandrel can be expanded or contracted as desired by an actuating cylinder. The mandrel expands or contracts in diameter to a position where a predetermined threading gap is formed between the mandrel expanding/retracting mechanism and the wrapper roll, which detects the amount of movement of the actuating cylinder of the mandrel expanding/retracting mechanism, and the mandrel is placed in a waiting position for threading. A down coiler for a hot strip mill, which is equipped with a device for stopping an expansion/contraction operation cylinder so as to maintain the diameter when the diameter is activated.