JP3033949B2 - Side guide device for rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side guide device for a hot / cold rolling mill, and more particularly to a side guide device which is effectively used for quickly and accurately moving a side guide head from a standby position to a set position. suggest.

[0002]

2. Description of the Related Art Generally, a side guide device for guiding a material to be rolled to a predetermined position of a rolling mill is provided on the entrance side of the rolling mill. The role of this device is not only to guide the material to be rolled to a predetermined position in the rolling mill, but also to prevent meandering of the material to be rolled during rolling.

[0003] Such a meandering phenomenon is caused by a setting error between a driving side and a non-driving side of a rolling roll of a rolling mill, an error in a perpendicularity between a rolling direction and a rolling roll, a difference between a driving side and a non-driving side of a material to be rolled. It occurs due to a difference in a gap, a difference in friction coefficient between a rolling roll and a material to be rolled on a driving side and a non-driving side, and the like tends to rapidly expand once this meandering occurs. Therefore, in order to prevent meandering, it is important to accurately guide the leading end of the rolling mill to a predetermined position of the rolling mill and to restrain the material to be rolled from meandering even during rolling. It is also essential for quality assurance.

[0004] For example, in the passing of a hot rolling mill, a side guide width on the entry side is first set. At this time, the hot rolling zone to enter does not always coincide with the center of the rolling mill. Therefore, the setting width of the side guide is set wider (standby position) for safety. Then, at the same time as the material to be rolled enters the side guide device, the material is closed at a high speed to a width obtained by adding a margin to the material width, or is forced to be slightly narrower than the material width and is side-guided. The centering method is used.

In a reverse mill, since the material to be rolled on the mill exit side does not necessarily pass through the center of the line, the side guide width is usually set to be larger than the plate width. In addition, a method is adopted in which the side guide is set to a width (set width) having a margin to the width of the material to be rolled. Such movement (stroke) from the standby position to the set position must be fast and accurate.

A conventional side guide device developed under such a concept is disclosed in Japanese Patent Application Laid-Open No. 52-5706.
No. 4, JP-A-2-87503, JP-A-6-1
There is a technology disclosed in Japanese Patent No. 5329 and the like, and a typical one is shown in FIG. This side guide device has a structure in which guides 103, 104 are translated in parallel by a mechanical synchronization mechanism involving a combination of racks 101, 101 'and pinion gears 102, 102' via a drive cylinder 100. In the first place, it is satisfactory.

[0007]

However, in the case of the above-mentioned mechanism, a sufficient place for setting the mechanism is required.
If a synchronization mechanism or the like cannot be installed on the side guide due to the structure of the rolling mill, cylinders for individually controlling the drive side and the operation side by providing separate position detectors must be installed, There is a problem that it is difficult to completely synchronize the drive side and the operation side.

This also means that, in the case of a side guide device having two cylinders on one side of a side guide head instead of a mechanical tuning device such as a rack-pinion, the parallel movement of the head is detected. Since the synchronization is performed by the devices, there remains a problem that the synchronization control is difficult as described above.

SUMMARY OF THE INVENTION It is, therefore, a primary object of the present invention to provide an apparatus for easily performing perfect synchronous control of the drive-side and operation-side side guide heads. Another object of the present invention is to propose a sidegait device capable of reliably and easily performing synchronous control of each head even when the area around the rolling mill is narrow. Still another object of the present invention is to improve the accuracy of meandering control by moving a head from a standby position to a set position at a high speed.

[0010]

According to the present invention, as a means for realizing the above-mentioned object, synchronous control of a main cylinder for driving each head from a standby position to a set position is performed by a conventional position detector. It is characterized in that a short stroke is performed at a high speed by providing an auxiliary cylinder for driving the main cylinder, instead of performing the individual operation by the output of the main cylinder.

That is, according to the present invention, one or two or more main cylinders on one side perpendicular to the right and left side guide heads are provided on each of the two left and right side guide heads whose guide surfaces are parallel to the rolling line. In the side guide device directly or independently connected to the main cylinder, the same number of auxiliary cylinders for moving the head at a high speed by a fixed width from the standby position to the set position are connected to the main cylinder by piping. Wherein the ratio of the cross-sectional area of the cylinder between the rod side and the non-rod side of the auxiliary cylinder is equal to the ratio of the cross-sectional area of the cylinder side between the rod side and the non-rod side of the main cylinder. It is a guide device.

In the present invention, the pipe connection between the main cylinder and the auxiliary cylinder is performed between the rod side and the opposite rod side and is connected to a closed circuit. In the present invention, an auxiliary cylinder driving cylinder is directly connected to the auxiliary cylinder for pushing the head from the standby position to the set position. The auxiliary cylinder driving cylinder is preferably driven by a solenoid valve. The present invention is characterized in that a stopper for setting a pushing stroke amount of a main cylinder driven by the auxiliary cylinder is attached to the auxiliary cylinder. In the present invention, the pressure reducing valve for controlling the tightening force of the material to be rolled by the head,
It is characterized in that it is provided in a closed circuit of the cylinder for driving the auxiliary cylinder. In the present invention, the piping system of each main cylinder and each auxiliary cylinder is connected to the rod side of the auxiliary cylinder on the operation side to the rod side of the main cylinder also on the operation side, and the opposite rod side of this operation side main cylinder is connected. Connect the rod side of this auxiliary cylinder to the opposite rod side of this auxiliary cylinder, connect the rod side of this auxiliary cylinder to the rod side of the main cylinder on the opposite drive side, and finally connect the rod side of this drive side main cylinder to the first It is characterized in that the auxiliary cylinder is sequentially connected to the opposite side of the rod to form a closed circuit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention shown in FIG. 2 will be described below. In FIG. 2, reference numeral 1 denotes a material to be rolled, and reference numerals 21 and 28 denote side guide heads disposed in parallel on both sides along the rolling line in the traveling direction of the material 1 to be rolled, that is, on the drive side and the operation side. is there. For example, a pair of rack gears 22 and 25 are fixed to the head 21 of the side guide on the driving side, and these are paired with pinion gears 23 and 26 via tuning shafts 24 having large torsional rigidity.
And the racks 22 and 25 are driven synchronously. Also, on the operation side, two rack gears 29, 33
And a pair of pinion gears 30 and 32 are meshed by the same arrangement, and are synchronously driven via the tuning shafts 24 and 31, and consequently parallel movement of both side guide heads in the opening direction or the closing direction. It is a tuning mechanism to secure.

Next, a description will be given of the configuration of a hydraulic pressure (hereinafter referred to as an example of hydraulic pressure) piping for positioning each of the side guide heads 21 and 28 in the closing direction from the standby position to the set position. By the way, the reference numerals 27 and 34 shown in the drawings are
It is a main cylinder for moving 28 and is a conventional one with a built-in piston position detector. The main cylinders 27 and 34 each have an electromagnetic switching valve for relatively slowly moving the heads 21 and 28 to the standby position.
40, 44 are connected. That is, when the solenoid valve 41 is excited, the hydraulic oil enters the non-rod side 27a of the main cylinder via the pipe. As a result, the side guide head 21 moves in the closing direction, while the solenoid valve 42, when energized, enters the rod side 27b of the main cylinder 27 and moves in the opening direction. When the solenoid valves 41 and 42 are not energized, they are in the neutral position.
The oil flow path is shut off, and the side guide is fixed. Although the above description has been made only for the hydraulic operating mechanism on the driving side, this is the electromagnetic switching valve 44 on the operating side,
The same applies to the piping system composed of the solenoid valves 45 and 46, the pilot check valve 47 and the piping 48, and the description is omitted.

The pipe connection 48 between the main cylinders 27, 34 and the solenoid-operated directional control valves 40, 44 is connected to the side guide head 2
Hydraulic piping for pushing and retracting 1, 28 to the standby position. In contrast, the hydraulic piping described below, i.e., the auxiliary cylinders 54, 56, the driving cylinders 55, 57, the electromagnetic switching valve 50 and the pipe connection 58 of the main cylinders 27, 34
Are for moving the side guide heads 21 and 28 from the standby position to the set position quickly with a short stroke, thereby capturing and centering both side ends of the material 1 to be rolled.

What is important in this mechanism is that the main cylinders 27, 34 and the auxiliary cylinders 54, 56
In this case, the ratio of the cross-sectional area on the rod side to the cross-sectional area on the non-rod side is equalized. For example, an auxiliary cylinder
This means that the ratio of the cross-sectional area in the cylinder between the non-rod side 54a and the rod side 54b of the cylinder 54 is equal to the cross-sectional area ratio in the cylinder between the non-rod side 27a and the rod side 27b of the main cylinder 27. This is another main cylinder
The same is true of the relationship between the cylinder space and the cylinder space. As can be seen from the above description, in the present invention, the same number of auxiliary cylinders 54, 56 as the main cylinders 27, 34 are connected,
A corresponding number of cylinders 55, 57 for driving the auxiliary cylinders are provided in direct connection with 4, 56, respectively.

Next, these piping configurations will be described. The feature of this piping configuration is that the main cylinder 2 has the same cylinder cross-sectional area ratio between the rod side and the non-rod side.
7, 34, the connection of the auxiliary cylinder 54, 56, between the rod-side rod side respectively, and the anti-rod side is to carry out with the anti-rod side, the hydraulic piping 48, 58 completely closed circuit It is to have done. Hereinafter, an example of the specific pipe connection will be described.

For example, the opposite side 54 of the auxiliary cylinder 54
a to the rod side 27a of the drive side main cylinder 27, and connect the rod side 27b of this main cylinder 27 to the rod side 56b of the next auxiliary cylinder 56 on the operation side. Connect the rod side 56a to the opposite rod side 34a of the operation side main cylinder 34,
Finally, the rod side 34b of the main cylinder 34 is connected to the rod side 54b of the first auxiliary cylinder 54 via a pipe 58 to form a complete closed circuit .

The auxiliary cylinders 54, 56 (86,
96) has a drive system to drive them.
Linder 55, 57 (81, 93) is in an embodiment as shown in FIGS.
It is directly connected. The auxiliary cylinder drive system
The cylinders 55 and 57 are connected to the electromagnetic switching valve 50 via the pipe 59
Have been. Therefore, the electromagnetic valve 51 of the electromagnetic switching valve 50 is excited.
By magnetizing, the pressure oil passes through the tightening force adjusting pressure reducing valve 53
I, SupplementAuxiliary cylinder drive cylinder55 ofOn the opposite rod side
InflowAs a result,Non-rod side 54a of auxiliary cylinder 54
The pressure oil is pushed outAndThe anti-rod of this auxiliary cylinder 54
The amount of oil corresponding to the volume in the side cylinder is
-27 flows into the opposite rod side 27a of
By the stroke, the main cylinder 27 moves the head 21 in the closing direction.
MovementYouYou. At the same time, the rod side 27b of this main cylinder 27
Pressurized oil is extruded from the
Flows into the rod side 56b ofThis auxiliary cylinder 56
Also, the disconnection between the cylinder inner rod side 56a and the rod side 56b
Area ratioIs the rod on the opposite side 34a of the main cylinder 34
And the cross-sectional area ratio with the side 34bBecause they are equal, each auxiliary
Both cylinders 54 and 56 have the same speed and the same straw
Will work withNote thatHigh speed, small stroke opening
To release, the solenoid valve 52 of the solenoid-operated switching valve 50 must be excited.
And driven by cylinder55Oil on the rod side ofToInflowSa
Let, Based on the same principle as aboveOnce activated
Good.

Similarly, the pressure oil flowing out of the auxiliary cylinder 56 from the opposite rod side 56a flows into the operation side main cylinder 34 opposite the rod side 34a, and the same amount of hydraulic oil as the drive side main cylinder 27 flows. Then, the operation side guide head 28 is moved in the closing direction by a stroke amount corresponding to the oil amount. Thus, a pair of left and right main cylinders 27,
34 can operate only at the same speed and the same stroke, and a tuning mechanism that moves the head in proportion to symmetry is established.

As described above, the operation of the auxiliary cylinders 54 and 56 allows the heads 21 and 28 to move at high speed with a stroke corresponding to the final adjustment width (margin width). Therefore, when the material to be rolled 1 is guided to the side guide, first, the solenoid valve 51 of the solenoid switching valve 50 is excited. As a result, as described above, the auxiliary cylinders 54 and 56 operate simultaneously at the same speed, and Set the side guides in place. The tightening force when sandwiching the material to be rolled 1 is a pressure reducing valve.
Can be adjusted by 53. In an actual machine, as the pressure reducing valve 53, a proportional electromagnetic pressure adjusting valve that can be remotely controlled and adjusted can be used.

As is apparent from the above description, the main points of the configuration of the present invention are as follows. To move the heads 21 and 28 to the standby position,
Main cylinders 27 and 34 using solenoid valves 40 and 44
, But in general, this operation has enough time,
Can be set accurately at low speed. Next, when the rolling mill enters the rolling mill entry side, it is necessary to move at a high speed and a short stroke, and the auxiliary cylinders 54 and 56 are effectively used for this operation. When the heads 21 and 28 sandwich the material to be rolled, the tightening force is adjusted by adjusting the pressure of the drive cylinders 55 and 57 for the auxiliary cylinder. Is accurately performed because the signals are synchronized in a closed circuit.

For example, in the example of FIG.
However, when pressed against the drive side, the pressing force on the head 21 increases. In this case, the pressing force of the opposite side, that is, the operating side head 28 decreases, but the pressure balance at this time is pressurized by the driving cylinder 57 for the auxiliary cylinder, and the pressure oil generated by the auxiliary cylinder 56 directly connected to this is Since the force received by the side guide head 28 is small with respect to this force, the amount of oil corresponding to the surplus force is reduced from the rod side 34b of the main cylinder to the auxiliary cylinder lot on the drive side. The pressure is transmitted to the side 54b, and in addition to the driving force of the driving cylinder 55, centering is realized in which the pressure on the non-rod side 54a of the auxiliary cylinder is increased. Such centering operation of the present invention is exactly the same as that of the conventional centering mechanism using the mechanical tuning device shown in FIG.

FIG. 2 shows an example in which a mechanical tuning mechanism is provided on each of the driving side and the operating side for the parallel movement of the side guide head. FIG. 3 omits this mechanism and uses only the cylinder. This is an example in which the head is translated. Hereinafter, this example will be briefly described.

In FIG. 3, a pair of side guides 70, 7
A total of four main cylinders 71a to 71d for moving 0 'are fixed on two sides on one side and a total of four electromagnetic switching valves 72a to 72d for standby positioning of each main cylinder. The pilot check valves 73a to 73d for blocking the flow and the main cylinders 71a to 71d are connected by a pipe 74.

Next, auxiliary cylinders 75a to 75d for discharging a constant amount of oil in a small stroke are provided, and in a manner similar to that described with reference to FIG. 2, the opposite side of the auxiliary cylinder is connected to the opposite side of the main cylinder by piping. Then, the rod side of the main cylinder is connected to the rod side of the next auxiliary cylinder by piping, and the non-rod side of this auxiliary cylinder is connected to the opposite rod side of the next main cylinder by pipe 77 in sequence, and finally By connecting to the rod side of the first auxiliary cylinder, a closed loop pipe is formed. Note that a driving cylinder 76 for driving the auxiliary cylinders 75a to 75d is provided.
a to 76d are provided with an electromagnetic switching valve 78 for operating the drive cylinders 76a to 76d, and a pressure reducing valve 79 for adjusting the tightening force on the side guide heads 70 and 70 ', and the pressure reducing valve 79 And the cylinder are connected by a pipe 80.

With such a piping configuration, when the auxiliary cylinder 75 is driven, all the main cylinders operate synchronously to move the main cylinder by an amount corresponding to the amount of oil discharged from the auxiliary cylinder. The operation mechanism at this time is exactly the same as the movement described in FIG. 2, and the detailed description is omitted. Therefore, this example can be said to be a very simplified and unique side guide device which provides a synchronization function with a hydraulic circuit and has no mechanical tuning device.

FIG. 4 shows the principle of operation of the auxiliary cylinder and its driving cylinder. Reference numeral 81 denotes a drive cylinder for an auxiliary cylinder, 82 denotes a piston, 83 denotes a piston rod, and when a predetermined pressure is applied to the pressurized oil inlet 84, the auxiliary cylinder connected thereto through the piston rod 83 The oil 90 in 86 is pushed out from the pressure oil outlet 91 and pushes the side guide head with a small stroke.

FIG. 5 clarifies the configuration of the auxiliary cylinder and its driving cylinder. This example has a configuration in which a drive cylinder 93 and an auxiliary cylinder 96 are directly connected via a connection fitting 94 and a piston connection fitting 95, and the auxiliary cylinder 96 is provided with a discharge port 98 and a suction port 97. Yes, a stopper that stops the movement of the piston connection bracket 95 to move the side guide with a small stroke
A stopper 99 is provided, and the operation of the stopper 99 determines the moving distance (stroke amount) of the head from the standby position by the main cylinder to the set position.

[0030]

As described above, according to the present invention,
Since the side guide head is moved synchronously by providing a small stroke auxiliary cylinder in addition to the main cylinder at high speed, the centering of the material to be rolled can be performed quickly and accurately, so that the meandering of the material to be rolled is effectively performed. Can be prevented.
Further, according to the present invention, there is also an effect that the equipment configuration around the rolling mill is simplified.

[Brief description of the drawings]

FIG. 1 is a conventional side guide device using a mechanical synchronization device.

FIG. 2 is an explanatory diagram of a side guide device of the present invention in which a side mechanism of a pair of side guide heads is synchronously moved by a mechanical mechanism, and synchronization between a drive side and an operation side is performed by a hydraulic system. .

FIG. 3 is an explanatory view of a side guide device of another example of the present invention in which synchronization of each side guide head and synchronization between a drive side and an operation side are both performed by a cylinder.

FIG. 4 is a sectional view showing the operation principle of an auxiliary cylinder and its driving cylinder.

FIG. 5 is a front view showing another configuration of the auxiliary cylinder and its driving cylinder.

[Explanation of symbols]

 1 Rolled material 21, 28 Side guide head 27, 34 Main cylinder 40 Solenoid switching valve 54, 56 Auxiliary cylinder 55, 57 Drive cylinder

Claims (6)

(57) [Claims] 1. A tuning mechanism is attached to each of two left and right side guide heads, each having a guide surface parallel to a rolling line, and one or more main cylinders at right angles to the heads. In the side guide device directly connected, the same number of auxiliary cylinders for moving the head at a fixed width from the standby position to the set position at a high speed with respect to the main cylinder are connected by piping, and the auxiliary cylinder is connected to the main cylinder. A side guide device for a rolling mill, wherein a cross-sectional area ratio between a rod-side and a non-rod side of a cylinder chamber and a cross-sectional area ratio between a rod-side and a non-rod side of the main cylinder are the same. 2. The apparatus according to claim 1, wherein a pipe connection between the main cylinder and the auxiliary cylinder is made between the rod sides and the rod sides and is connected to a closed circuit. 3. The apparatus according to claim 1, wherein an auxiliary cylinder driving cylinder is directly connected to the auxiliary cylinder for pushing the head from a standby position to a set position. 4. The device according to claim 1, wherein a stopper for setting a pushing stroke amount of the main cylinder driven by the auxiliary cylinder is attached to the auxiliary cylinder. 5. The apparatus according to claim 1, wherein a pressure reducing valve for controlling the tightening force of the material to be rolled by the head is provided in a closed circuit of the cylinder for driving the auxiliary cylinder. 6. The piping system of each main cylinder and each auxiliary cylinder is connected with the rod side of the auxiliary cylinder on the operation side to the rod side of the main cylinder also on the operation side, Side to the opposite rod side of the next auxiliary cylinder, connect the rod side of this auxiliary cylinder to the rod side of the main cylinder on the opposite drive side, and finally connect the opposite rod side of this drive side main cylinder The apparatus according to any one of claims 1 to 5, wherein the first auxiliary cylinder is sequentially connected to a side opposite to the rod to form a closed circuit.