JP2987129B2 - Mill guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mill guide device for guiding a rolled material to a horizontal roll of a rolling mill when rolling a shaped steel.

[0002]

2. Description of the Related Art When a section steel is rolled, a mill guide device is used to accurately introduce a rolled material (a material to be rolled such as a section steel) between horizontal rolls of a rolling mill. Mill guide devices are generally arranged before and after the rolling mill,
Guide members in contact with the rolled material are provided on the upper side and the lower side of the rolling line, and the guide members are used in a state where the leading end of each guide member is in contact with the surface of the horizontal roll.

A conventional mill guide device is generally configured as shown in FIG. In the drawing, reference numerals 2 and 3 denote horizontal rolls of the rolling mill 1, reference numerals 4 and 5 denote table rollers, and respective devices arranged substantially symmetrically before and after the horizontal rolls 2.3 are mill guide devices 10 '. 10 ". Each of the mill guide devices 10 'and 10" is
As shown, guide members 11 'and 21' are provided on the upper and lower sides of the rolling line A,
b ′ is in contact with each surface of the horizontal rolls 2 and 3.

[0004] For the upper guide member 11 ', the tip 1
In order to bring 1b 'into contact with the surface of the horizontal roll 2, an upward force must be applied to it, and a spring 14' has been usually used as a means for doing so. That is, by applying a part of the guide member 11 ′ to the rest bar 15 ′ and applying an upward force exceeding the weight of the guide member 11 ′ to the guide member 11 ′ from the spring 14 ′, the tip part 11 b ′ is leveled. It is brought into contact with the roll 2. As a means for applying an upward force to the guide member 11 ', a hydraulic cylinder (such as an air cylinder) may be used instead of the spring 14'. Rolled material B
When the size of the guide member 11 ′ changes, the guide member 11 ′ becomes the spring 14 ′, the cylinder and the rest bar 15 ′.
Is removed from the support portion including the, and replaced with another size.

The above point is disclosed in Japanese Patent Laid-Open No. 47-38.
762, etc.

[0006]

It is desirable that the leading end of the guide member and the horizontal roll of the rolling mill contact with an appropriate pressure. When the contact pressure is low, the leading end of the guide member separates from the horizontal roll due to vibration or the like, and may not be able to smoothly guide the rolled material such as hitting the rolled material exiting the horizontal roll, while if the contact pressure is too high This is because the tips of the guide members in contact with each other and the surface of the horizontal roll are excessively worn.

However, when an upward force is applied to the upper guide member only by the spring as described above, it is difficult to always keep the contact pressure between the tip of the guide member and the horizontal roll appropriate. That is, since the force at which the leading end of the guide member comes into contact with the horizontal roll is substantially equal to the difference between the upward force of the spring and the weight of the guide member, the guide member is replaced according to the size of the rolled material or the like (there is no change). Weight also changes), the contact force mentioned above may also change and become inappropriate. In this case, it is possible to make the contact force appropriate according to the weight of the guide member by adjusting the mounting height of the spring, but such adjustment is difficult to perform manually at the rolling site. It is. In addition, since it is not easy to release the upward force applied to the guide member by the spring, there is also a disadvantage that it is difficult to easily replace the guide member when changing the rolling size.

On the other hand, if an upward force is applied to the upper guide member by a hydraulic cylinder instead of a spring, the contact force should be optimized by changing the fluid pressure according to the weight of the replaced guide member. In addition, when the guide member is replaced, the force can be released to facilitate the replacement operation. However, when a trouble occurs in a fluid pressure supply source (such as a pump, its drive motor, or an accumulator), the upper guide member is lowered to lose contact with the horizontal roll, and the function as the guide member is achieved. Disappears. In that case, even if there is no abnormality on the rolling mill side, rolling must be stopped.

It is an object of the present invention to have a function of always making the contact pressure between the leading end of the guide member and the horizontal roll appropriate and to enable rolling even if a trouble occurs in the fluid pressure supply source. It is to provide a mill guide device having such advantages.

[0010]

According to a first aspect of the present invention, in order to guide a rolled material to a horizontal roll of a rolling mill, upper and lower guide members contact respective tips of the mill with the horizontal roll. In the mill guide device arranged in such a manner, an upper guide member or its support is connected to a fluid pressure cylinder for applying a downward force and a spring for applying an upward force regardless of the state of the cylinder. I do. A hydraulic cylinder, an air cylinder, or the like can be used as the fluid pressure cylinder, and a coil spring, a disc spring, a leaf spring, or the like can be used as the spring.

In this mill guide device, the tip of the upper guide member can always be brought into contact with the surface of the horizontal roll with an appropriate pressure. The upper guide member receives the force from both the fluid pressure cylinder and the spring as described above, and at the time of rolling, the tip portion is leveled as an action of the difference (the resultant force) between them (and gravity and frictional force, etc.). Since the roller is brought into contact with the roll, the pressure of the contact can be appropriately adjusted by appropriately changing the fluid pressure of the cylinder according to the weight of the guide member to be used. When the leading end of the guide member is brought into contact with the horizontal roll, the position is stabilized, the (guide surface of) the guide member is maintained at a predetermined position and angle, and the rolled material is always smoothly guided.

Further, according to this mill guide device, rolling can be performed even if a trouble occurs in the supply source of fluid pressure to the cylinder. The reason is as follows. In other words, in this device, while an upward force is always applied from the spring, a downward force is applied by the fluid pressure cylinder, and an upward force (a force for contacting the horizontal roll) is generated as a difference between the two. The upward force of the spring is strong enough. That is, even when a trouble occurs in the fluid pressure supply source or the like and the action of the fluid pressure does not reach the cylinder, the guide member is raised by the force of the spring, and the leading end thereof is kept in contact with the horizontal roll. be able to. If the contact state between the leading end of the guide member and the horizontal roll is stably maintained in this way, the function of guiding the rolled material as a guide member is ensured, and the rolling can be continued.

According to a second aspect of the present invention, the cylinder body of the hydraulic cylinder (that is, a cylindrical body having a piston inside and having a fluid pressure introduced therein) is disposed above the upper guide member. The extension rod and the cylinder body, which are connected to the upper guide member or its supporting member by connecting the distal end of the operation rod projecting downward from the cylinder body and connected integrally with the operation rod (and piston) and project upward from the cylinder body. The above-mentioned spring is attached in a compressed state between the upper end of the spring.

In other words, in this mill guide device, the tip of an operating rod projecting downward from the cylinder body of the fluid pressure cylinder is connected to the guide member or its support,
A spring is connected via the extension rod integrated with the operation rod. Since the spring is mounted in a compressed state between the upper end of the cylinder body and the extension rod protruding upward, regardless of the state of the cylinder, the extension rod and the operation rod (and the piston) are pulled up to the guide member. Always apply force upwards. In the cylinder, when no fluid pressure is applied, the operating rod is pulled up by the force of the spring, but when receiving the fluid pressure, the rod is lowered to apply a downward force to the guide member or its support. The reason that the cylinder and the spring exert a downward force and an upward force on the guide member or the like in this way is that the cylinder and the spring are arranged in parallel on some member, and their tips are applied to the guide member or the like. It is exactly the same as when connected.

The second aspect of the present invention is characterized in that the fluid pressure cylinder and the spring are integrally formed. That is, compared to the case where they are arranged in parallel on the fixing member as described above and connected to the guide member and its support, the cylinder and the spring are integrally assembled, so that they are compact and save space. Has the effect.
In addition, the spring is attached between the extension rod of the cylinder and the cylinder body and is not connected to other members, so it can be removed at the same time as the cylinder is removed, and can be handled integrally with the cylinder. Easy to maintain. Since the spring is mounted not on the inside of the cylinder into which the fluid is introduced but on the outside of the cylinder, there is an advantage that the spring can be easily assembled to the cylinder.

According to a third aspect of the present invention, there is provided a mill guide device comprising: a fluid pressure (p _x ) for causing the cylinder to exert a force appropriately set within a range not exceeding the force of the spring; A fluid supply circuit capable of selectively applying a fluid pressure (p ₁ ) exerted on the cylinder to the cylinder is connected to the cylinder.

According to this mill guide device, it is easy to adjust the contact pressure between the tip of the upper guide member and the horizontal roll as described above, and it is possible to separate the guide member from the horizontal roll. is there. That is, first, the fluid supply circuit is appropriately set in advance within the range not exceeding the force of the spring so that the fluid pressure p _{x -that} is, the contact pressure is appropriately adjusted according to the weight of each guide member. When a fluid pressure that exerts a force on the cylinder is applied to the cylinder, the contact pressure described above becomes an appropriate magnitude according to the weight of the guide member and the like. When the fluid supply circuit causes the cylinder to exert the fluid pressure p _1, that is, the fluid pressure that exerts a downward force on the cylinder that exceeds the upward force of the spring or the like, the upper guide member Is subjected to an upward force by the spring and a downward force exceeding the force, and as a result, the leading end of the guide member is separated from the surface of the horizontal roll. If the distal end of the upper guide member can be separated from the horizontal roll in this way, it is easy to adjust the position of the guide member, and to perform various inspections and maintenance or exchange.

According to a fourth aspect of the present invention, there is provided a mill guide device according to the third aspect, wherein the upper guide member is hung on a support shaft as described in a) below (that is, the upper guide member is easily detached simply by being hooked from above). In addition to the above, the other parts of the guide member are supported by a support tool as shown in b) below. The support shaft and the support means are: a) one support shaft arranged in parallel with the horizontal roll and capable of moving away from the horizontal roll; b) a guide member under the force of the above-mentioned spring and cylinder. When the guide member moves away from the horizontal roll together with the support shaft in a state in which the cylinder exerts a force exceeding the force of the spring, the support member comes off the guide member. Say.

In such a mill guide device, the upper guide member is easily replaced. The guide member at the time of rolling is hung on the support shaft of a), supported by the support of b), receives an upward force (the difference described above), and causes the leading end to contact the surface of the horizontal roll. However, the guide member in this state can be easily removed by the following procedure. That is,
First, the fluid pressure p is applied to the cylinder by the fluid supply circuit.
By acting ₁ (that is, exerting a force exceeding the force of the spring on the cylinder), the tip of the guide member is separated from the surface of the horizontal roll as described above. In this state, the support shaft of a) is moved in a direction away from the horizontal roll, whereby the guide member hung on the support shaft also moves in the same direction. Then, the support of b) comes off from the guide member, and the guide member is hung only on the support shaft of a), so that the relationship between the support shaft and the guide member is cut off, and then only the support shaft is used. By returning to the rolling mill side, the guide member can be easily removed. In addition, it is also possible to attach a new guide member in a state where rolling can be performed by performing the procedure reverse to the above.

[0020]

1 to 3 show an embodiment of the present invention. FIG. 1 is a side view of a rolling mill 1 and a mill guide device 10, FIGS. 2 (a) and 2 (b) are respectively aa sectional view and bb sectional view in FIG. 1, and FIG. FIG. 2 is a system diagram of a fluid supply circuit 30 connected to the device 10.

The mill guide device 10 is disposed adjacent to the rolling mill 1 as shown in FIG. In connection with the fact that the rolling mill 1 performs reverse rolling, the illustrated mill guide device 10
At the same time, another mill guide device (not shown) is symmetrically arranged at a position opposite to the rolling mill 1. The mill guide device 10 has a guide member 11 and a guide member 21 on the upper side and the lower side along the rolling line A, respectively, so that a rolled material such as an H-section steel can be moved between the horizontal rolls 2 and 3. And so on. That is, as shown in FIG. 2, in the state where the tip portions 11b and 21b of the guide members 11 and 21 are in contact with the surfaces of the upper and lower horizontal rolls 2 and 3 and the guide surfaces 11a and 21a are kept horizontal, as shown in FIG. It will guide you. However, the guide members 11 and 2
When the size or the like of the rolled material B is changed, 1 is replaced with a material having a different shape and size (and therefore a different weight).

As shown in FIG. 1, the lower guide member 21 of the mill guide device 10 is configured such that the base 21c is hung on the rest bar 25 and the tip of the flange 21d is slightly pulled down by the support 22. Installed. The rest bar 15 is a cylindrical support shaft,
Along the vertically movable frame 28 with the screw jack 27 as the elevating means, a front-rear direction (the front means the direction approaching the rolling mill 1, that is, the left side in FIG. 1, and the rear means the reverse, the same applies hereinafter). It is slidably supported, and is pushed and pulled in that direction by a retractable hydraulic cylinder 26. The support member 22 is a U-shaped member as shown in FIG. 2A and is caught on the upper surface of the flange portion 21d of the guide member 21 to reduce the downward force of the hydraulic cylinder 23 connected to the lower portion of the guide member 21. 21. The guide member 21 is hung on the rest bar 15 as shown in FIG. 1, and its position in the front-back direction is determined. 21b is kept in contact with the surface of the horizontal roll 3.

As for the upper guide member 11, as shown in FIG. 1, the base 11c is hung on the rest bar 15, and a portion near the front end of the flange portion 11d is supported by the support member 12. The rest bar 15 on the upper side is also a column-shaped support shaft, and is supported so as to be slidable in the front-rear direction in a frame 18 that moves up and down by using a screw jack 17 as a raising / lowering means. Is pushed and pulled. To prevent the guide member 11 from coming off from the rest bar 15,
The base 11c is formed in a J-shape as shown in FIG. 1 so as to be hooked deeply on the rest bar 15, and as shown in FIG. 2B, the stepped portion formed on the base 11c and the rest bar 1 are formed.
5, and the retaining ring 19 is fitted.
Like the lower support 22, the support 12 is also a U-shaped member as shown in FIG. 2 (a), the tip is hung on the lower surface of the flange portion 11 d of the guide member 11, and the upper portion is operated by the hydraulic cylinder 13. It is connected to the rod 13c. As shown in FIG.
1c is hung on the rest bar 15 to determine the position in the front-rear direction, and the support member 12 is hung up on the flange portion 11d so that the tip 11b of the upper guide member 11 also has the surface of the horizontal roll 2. Is kept in contact with

In the mill guide device 10, the structure of the hydraulic cylinder 13 and the like are devised as follows so that the upper guide member 11 can be brought into contact with the horizontal roll 2 at an appropriate pressure. . First, as shown in FIG.
a, which is a so-called double rod type in which the rods protrude from both sides from one side, the support 12 is connected to one operation rod 13c as described above, and a spring (coil spring ) 14 is attached. The spring 14 has an end plate 13e attached to the tip of the extension rod 13d and the cylinder body 13
It is to be mounted in a compressed state between the end face a and a spring cover 14a.

Then, after the operation rod 13c is directed downward, the cylinder body 13a is fixed to the frame 18, and a fluid supply circuit 30 as shown in FIG. At this time, a pipe 36 of a high-pressure oil supply system is connected to a portion above the piston 13b inside the cylinder body 13a, and a drain system pipe 37 is connected to a portion below it. By doing so, the upward force of the spring 14 always acts on the support 12 of FIG. 2, and when fluid pressure is applied to the cylinder 13 from the pipe 36, the upward force of the spring 14 and the cylinder 13 Will act on the support 12. Assuming that fluid pressure does not act from the pipe 36 as the spring 14, even when the heaviest one of the guide members 11 is used, the guide member 11 is pulled up via the support member 12 and its tip portion 11b Is sufficiently strong enough to make stable contact with the surface of the horizontal roll 2.

The configuration of the fluid supply circuit 30 of FIG. 3 connected to the hydraulic cylinder 13 is as follows. First, a pressure reducing valve 32 is provided in front of a pump 31, and its drain side is connected to an oil tank 38 via an electromagnetic switching valve 33.
An electromagnetic switching valve 34 is provided on the secondary pressure side. The electromagnetic switching valve 34 has a total of three such that either the secondary pressure side or the drain system communicating with the oil tank 38 communicates with the high pressure oil supply system piping 36 to the cylinder 13 through the switching valve 34. Connect the piping system. A speed adjusting valve 35 is provided in the middle of a high-pressure oil supply pipe 36 leading to the cylinder 13, and the drain pipe 37 connected to the cylinder 13 is connected to an oil tank 38. Although the secondary pressure can be arbitrarily adjusted by the pressure reducing valve 32, the primary pressure which is not reduced is directly applied to the secondary pressure side by switching the electromagnetic switching valve 33 on the drain side (to a position opposite to that shown in the figure). It is also possible to make it. The primary pressure that does not reduce the pressure is the discharge pressure of the pump 31, and this pressure is set to a magnitude that causes the hydraulic cylinder 13 to exert a downward force exceeding the upward force of the spring 14. In this fluid supply circuit 30, when the electromagnetic switching valves 33 and 34 are at the illustrated positions, the secondary pressure set by the pressure reducing valve 32 acts on the cylinder 13 from the pipe 36. When the switch 33 is switched, the primary pressure that does not reduce the pressure acts on the cylinder 13 via the pipe 36 as described above. At the time of a power failure, the switching valve 34 switches from the state shown in the figure, so that no fluid pressure acts on the cylinder 13 regardless of the operating state of the pump 31.

The hydraulic cylinder 13 and its fluid supply circuit 30
In this mill guide device 10 configured as described above,
The following functions are available. 1) When rolling, the magnitude of the downward force by the hydraulic cylinder 13 is adjusted by changing the secondary pressure of the pressure reducing valve 32 in FIG. Since it can be changed as appropriate, the contact pressure between the front end portion 11b of the guide member 11 and the surface of the horizontal roll 2 that come into contact as shown in FIG. Even when the guide member 11 is replaced with a change in the rolling size and its weight changes, the contact pressure can be made appropriate by appropriately setting the fluid pressure.

2) Since the spring 14 that exerts a sufficient upward force is used as described above, even if any trouble occurs in the fluid supply circuit 30 and the fluid pressure does not act on the cylinder 13, the spring 14 is supported. The tool 12 is the guide member 11
, And the leading end 11 b can be kept in contact with the horizontal roll 2. In this state, since the contact pressure is high and the tip 11b and the horizontal roll 2 are liable to wear, it is preferable to eliminate the trouble of the circuit 30 at an early stage. However, it is necessary to maintain the contact between the tip 11b and the horizontal roll 3. , It is possible to perform rolling for the time being.

3) By switching the electromagnetic switching valve 33 in FIG. 3 to apply the primary pressure to the hydraulic cylinder 13 as it is, a downward force exceeding the force of the spring 14 is exerted on the hydraulic cylinder 13 to push down the support 12. The tip 11b of the guide member 11 can be separated from the surface of the horizontal roll 2. When the guide member 11 can be separated from the horizontal roll 2 in this manner, the retracting cylinder 16
It is easy to adjust the position and height of the guide member 11 by using the jack 17 and the like, to perform various inspections and maintenance, and to replace the guide member 11 as described below.

4) In addition to being able to push down the support 12 by the hydraulic cylinder 13 as described in 3), the rest bar 15 can be moved back and forth as described above, and the guide member 11 is hung on the rest bar 15. In the mill guide device 10, the replacement of the guide member 11 is extremely easy, because the guide member 11 is fastened and supported by the support 12 from below. That is, first, the switching valve 33 (FIG. 3) is operated to apply a primary pressure to the hydraulic cylinder 13, and the support 12 is pushed down by a downward force exceeding the spring force. Is separated from the surface of the horizontal roll 2. In that state, extend the retracting cylinder 16,
The rest bar 15 and the guide member 11 are retracted in a direction away from the horizontal roll 2 (to the right in FIG. 1). When the guide member 11 retreats sufficiently, its flange portion 11d comes off the support member 12, and the guide member 11 is in a state of hanging only on the rest bar 15. After that, the above-described retaining ring 19 (FIG. 2B) is removed from the guide member 11, and the guide bar 11 can be removed by pulling the rest bar 15 back to the horizontal roll 2. Then, by performing substantially the same operation in the reverse procedure and attaching a new guide member 11, the replacement of the guide member 11 is completed.

[0031]

The mill guide device according to the first aspect has the following effects. That is, a) by appropriately changing the fluid pressure of the cylinder according to the weight of the guide member to be used, the tip of the upper guide member can always be brought into contact with the surface of the horizontal roll with an appropriate pressure, Wear of the contact portion between the guide member and the horizontal roll can be minimized.

B) Since a sufficiently strong upward force is applied to the guide member by the spring, even if a trouble occurs in the supply source of the fluid pressure to the cylinder, the tip of the guide member keeps contact with the horizontal roll. , Enables smooth rolling.

According to the second aspect of the present invention, c) since the fluid pressure cylinder and the spring are integrally formed, the apparatus is compact and the inspection and maintenance are easy. Since the spring is attached to the outside of the cylinder, not to the inside of the cylinder into which the fluid is introduced, there is also an advantage that both can be easily assembled.

In the mill guide device according to the third aspect, d) the contact pressure between the upper guide member and the horizontal roll can be easily adjusted by using the fluid supply circuit, and the guide member can be moved from the horizontal roll. It can be easily separated.

According to the mill guide device of the fourth aspect, particularly, e) it is easy to remove the upper guide member and to attach a new guide member.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention;
It is a side view about rolling mill 1 and mill guide device 10.

FIG. 2 is a sectional view taken along line aa (FIG. 2 (a)) and a sectional view taken along line bb (FIG. 2 (b)) of FIG.

FIG. 3 shows a fluid supply circuit 3 connected to a mill guide device 10.
FIG.

FIG. 4 shows a conventional general mill guide device 10 ′ · 10 ″.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling machine 2.3 Horizontal roll 10 Mill guide device 11/21 Guide member 11b / 21b Tip 12 Support 13 Hydraulic cylinder 13a Cylinder main body 13c Operating rod 13d Extension rod 14 Spring 15 Rest bar (support shaft) 30 Fluid supply circuit 32 Pressure reducing valve 33/34 Solenoid switching valve

Claims (4)

(57) [Claims] 1. A mill guide device in which upper and lower guide members are arranged with their respective tips in contact with the horizontal rolls for guiding the rolled material to the horizontal rolls of the rolling mill. A mill guide device wherein a member or a support thereof is connected to a fluid pressure cylinder for applying a downward force and a spring for applying an upward force regardless of the state of the cylinder. 2. The cylinder body of the cylinder is disposed above the upper guide member, and the tip of an operating rod projecting downward from the cylinder body is connected to the upper guide member or its support, and The mill according to claim 1, wherein the spring is mounted in a compressed state between an extension rod integral with the operation rod and projecting upward from the cylinder body and an upper end of the cylinder body. Guide device. 3. A fluid pressure causing the cylinder to exert a force appropriately set within a range not exceeding the force of the spring, and a fluid pressure causing the cylinder to exert a force exceeding the force of the spring. The mill guide device according to claim 1, wherein a fluid supply circuit that can be selectively actuated is connected to the cylinder. 4. The upper guide member is hung on one support shaft that is arranged in parallel with the horizontal roll and that can move away from the horizontal roll, and receives the force of the spring and the cylinder. A support for supporting the guide member, the support being disengaged from the guide member when the guide member moves away from the horizontal roll together with the support shaft in a state where the cylinder exerts a force exceeding the force of the spring. 4. The mill guide device according to claim 3, wherein the other portion of the guide member is supported.