JPH0716618A - Device for rearranging roll of piercing mill - Google Patents

Abstract

PURPOSE:To make a roll rearrangement work efficient and to lower the overall height of a mill. CONSTITUTION:Upper and lower rolls 2, 3 wich are lifted and lowered with upper and lower screw down devices 6, 7 and right and left disks 8 whih are supported with a disk housing 11 are provided between front and rear housings 1. A lower clamp bracket 19 for holding a cradle clamp 18 on the side of the lower roll 3 is composed so as to be moved with a moving device. The disk housing 11 above the lower clamp bracket 19 is provided so as to be vertically swung with a swing device. The lower clamp bracket 19 is moved with the moving device, the disk housing 11 is swung with the swing device and a space S for taking in/out roll is formed in the space after displacing the lower clamp bracket 19 and disk housing 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll changing device for a piercing mill used in a seamless pipe manufacturing facility.

[0002]

2. Description of the Related Art Among piercing mills, a vertical type piercing mill has upper and lower rolls 2 with a pass line L sandwiched between front and rear housings 1 as shown in FIGS.
3 are arranged, and the upper and lower rolls 2 and 3 are supported by the upper and lower cradle 4 and 5, respectively, and the upper and lower cradle 4 and 5 are connected to the upper and lower rolling down devices 6 and 7, respectively.
The left and right discs 8 are arranged between the front and rear housings 1 with the pass line L interposed therebetween, and the bearing cylinders 10 for holding the rotary shafts 9 of the discs 8 are respectively pressed down in the left and right directions.
Via the upper and lower parts of the front and rear housings 1 to be supported by a disk housing 11 which projects outward in the left-right direction, and a material is inserted between the upper and lower rolls 2 and 3 and the left and right disks 8. is there.

Further, a projection 13 is provided on the outer side of the upper and lower cradle 4, 5 and a piece block 14 which engages with the projection 13 is provided. A screw shaft 15 extending horizontally is screwed through the piece block 14. And a block for connecting the screw shaft 15 to a motor 17 via a power transmission mechanism 16 and rotating the screw shaft 15 via the power transmission mechanism 16 by driving the motor 17 to engage with the protrusion 13. By moving 14 in the horizontal direction, it is possible to rotate the cradle 4 and 5 respectively to adjust the lead angles of the rolls 2 and 3, and to fix the adjusted lead angles of the rolls 2 and 3. Clamp bracket 1 with cradle clamp 18 attached between front and rear housings 1
9 is held.

In the above piercing mill, the rolls 2 and 3 are changed regularly or as needed. When the rolls 2 and 3 are recombined, conventionally, with the disk 8 retracted, first, the lower roll down device 7 is operated to lower the lower roll 3 to the lowermost part through the lower cradle 5, and then the lower roll 3 is moved. To the lower position in the housing 1 on the reassembling rail 20 in the left-right direction that is orthogonal to the pass line L installed from the roll shop, and is transferred to the outside of the housing 1 via the cradle 5 and the wheels 21. Next, after the upper roll 2 is lowered to the lowermost portion via the upper cradle 4 by the operation of the upper rolling down device 6, the upper roll 2 is transferred onto the reassembling rail 20 for each cradle 4 via the transfer carriage. In addition, similarly, a method of pulling out to the outside of the housing 1 is adopted.

[0005]

However, in the case of the above-mentioned conventional roll changing system, the clamp bracket 19 of the lower cradle clamp 18 which is aligned with the working position of the lower roll 3 is mounted between the housings 1. There is a problem that the space 1 for loading and unloading the roll under the clamp bracket 19 must be secured, which causes a problem that the height of the housing 1 becomes high. Since the operation amount (stroke) of the rolling-down device 6 becomes large, the total height of the piercing mill becomes high, and it takes time to elevate and lower the rolls, resulting in a long time for the entire roll reassembling work.

Therefore, according to the present invention, it is possible to reduce the height of the housing without the need to secure a dedicated space for taking in and out the roll, and to reduce the operation amount of the upper pressure reducing device to increase the total height of the piercing mill. It is an object of the present invention to provide a roll changing device that can be lowered and can shorten the entire roll changing time.

[0007]

In order to solve the above-mentioned problems, the present invention arranges an upper and lower rolls and left and right discs between front and rear housings, and the upper and lower rolls can be moved up and down by an upper and lower rolling down device. While supporting the upper and lower cradle, the left and right discs are supported by the disc housing arranged in the upper part between the front and rear housings, and the lower cradle clamp for fixing the lower cradle is
In a roll changing device for a piercing mill, which is held by a lower clamp bracket provided at a lower portion between front and rear housings, the lower clamp bracket is connected to a moving device such that the lower clamp bracket can be vertically moved or swung in a horizontal direction. A disc housing located above the lower clamp bracket is connected to a swing device such that the disc housing can swing vertically or laterally, and upper and lower rolls are provided between the front and rear housings after the disc housing and the lower clamp bracket are displaced. The upper and lower cradle can be stacked to form a roll loading / unloading space for loading / unloading.

[0008]

When the rolls are reassembled, the lower clamp bracket is lowered or swung laterally by the moving device, and the disc housing located above the lower clamp bracket is swung upward or laterally by the swing device. As a result, a roll access space is formed on the left and right sides between the front and rear housings, so the upper and lower rolls are stacked by placing the upper cradle on top of the lower cradle. And pass it together and pull it out to the left and right. Insert the new roll in reverse order.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a lower cradle clamp 18 for fixing the lower cradle 5 is held in a piercing mill having the same structure as shown in FIGS. 2 to 4. The lower clamp bracket 19 configured as described above is configured to be movable up and down along an elevating guide 22 provided on the lower facing surface of the front and rear housings 1, and a cylinder serving as a moving device is provided on the lower surface of the lower clamp bracket 19. Rails 23 that connect to the upper and lower sides of the lower clamp bracket 19 and that extend in the left-right direction.
4 is provided so that when the lower clamp bracket 19 is lowered by the operation of the cylinder 23, the rail 24 communicates with the rearrangement rail 20 extending in the left-right direction from the roll shop to the lower position outside the housing 1.

Further, the upper end of the disc housing 11 located above the lower clamp bracket 19, that is, the upper end of the disc housing 11 located on the left side of the drawing is provided at the upper end of the housing 1 in the front-back direction (see FIG. 4 is suspended and supported on a support shaft 25 (pass line L direction shown in FIG. 4),
A cylinder 26, which is provided as a swing device on the outer side of the housing 1, is connected to the disc housing 11 so that the left disc housing 11 can be vertically swung about a support shaft 25 by the operation of the cylinder 26. Thus, a roll loading / unloading space S can be formed between the front and rear housings 1 after the disc housing 11 and the lower clamp bracket 19 are displaced so that the upper and lower rolls 2 and 3 can be stacked and loaded.
Reference numeral 27 denotes a spacer which is interposed between the upper and lower cradle 4 and 5 when the upper and lower rolls 2 and 3 are stacked.

When the rolls 2 and 3 are recombined, the lower clamp bracket 19 is first lowered by the contraction operation of the cylinder 23 with the left and right disks 8 removed, and the upper rail 24 is assembled outside the housing 1. The disc housing 11 on the left side is made to swing upward with the support shaft 25 at the upper end as a fulcrum by the extension operation of the cylinder 26.
A roll loading / unloading space S is formed between the front and rear housings 1 after the disk 9 and the disk housing 11 are displaced.

In this state, the lower rolling device 7 is operated to lower the lower roll 3 to the lowermost position, and then the upper rolling device 6 is operated to lower the upper roll 2 onto the lower roll 3 and onto the lower cradle 5. The upper and lower rolls 2 and 3 are stacked so that the upper cradle 4 is placed via the spacer 27. After that, the upper and lower rolls 2 and 3 are integrally transferred onto the rail 24 by the wheels 21 of the lower cradle 5, passed through the roll loading / unloading space S, pulled out onto the rearrangement rail 20, and moved to the roll shop. To do. The rolls 2 and 3 may be moved via a carriage.

When incorporating new rolls 2 and 3, the procedure is reversed from the above.

In the above, the lower clamp bracket 19
Can be moved up and down, and the disc housing 11 located above the clamp bracket 19 can be swung, so that the lower clamp bracket 19 and the disc housing 1
Since the roll loading / unloading space S is formed in the space after displacing 1, the height of the housing 1 is higher than that of the conventional method in which the roll loading / unloading space is formed below the lower clamp bracket 19. Can be lowered. Further, since the upper and lower rolls 2 and 3 can be integrally taken in and out from the roll take-in / out space S, the rolls 2 and 3 can be taken out and put in order in comparison with the conventional method in which the upper and lower rolls 2 and 3 are taken out and put in order. The rearrangement time of No. 3 can be shortened, and the operation amount of the upper pressure reduction device 6 can be small, so that the height of the entire piercing mill can be reduced.

In the above embodiment, the case where the left disk housing 11 can be swung in the vertical direction has been shown, but it may be swung laterally.
Although the right side disk housing 11 is shown as being fixed in position, it may be displaced similarly to the left side, and in the embodiment, the case where the lower clamp bracket 19 can be moved up and down is shown. The swing device of the disk housing 11 is not limited to the cylinder 26, and may be configured to be horizontally swingable with one end as a fulcrum, and other ranges not departing from the gist of the present invention. Of course, various changes can be made within.

[0017]

As described above, according to the roll reassembling device of the piercing mill of the present invention, the lower clamp bracket holding the lower cradle clamp can be moved up and down or can be horizontally swung, and above the lower clamp bracket. Since the located disc housing can be swung in the vertical direction or sideways, and a roll loading / unloading space can be formed between the lower clamp bracket and the disc housing for stacking the upper and lower rolls in and out. The height of the housing can be reduced and the working amount of the upper and lowering devices can be reduced compared to the case where the space for entering and exiting the rolls is secured, so that the total height of the piercing mill can be reduced and the building The height of the roll can be kept low, and the upper and lower rolls Since it is possible, it is possible to shorten the working time required for roll recombinant, exhibits excellent effects and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a roll changing device of a piercing mill of the present invention.

FIG. 2 is a front view showing an example of a piercing mill.

3 is a view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

[Explanation of symbols]

 1 Housing 2,3 Rolls 4,5 Cradle 6,7 Rolling Down Device 8 Disc 11 Disc Housing 18 Cradle Clamp 19 Clamp Bracket 23 Cylinder (Movement Device) 26 Cylinder (Swing Device) S Roll In / Out Space

Claims (1)

[Claims] 1. The upper and lower rolls and the left and right discs are arranged between the front and rear housings, and the upper and lower rolls are supported by the upper and lower cradles that can be raised and lowered by the upper and lower reduction devices. A lower cradle clamp for supporting the lower cradle, which is supported by the disc housing arranged in the upper part between the housings,
In a roll changing device for a piercing mill, which is held by a lower clamp bracket provided at a lower portion between front and rear housings, the lower clamp bracket is connected to a moving device such that the lower clamp bracket can be vertically moved or swung in a horizontal direction. A disc housing located above the lower clamp bracket is connected to a swing device such that the disc housing can swing vertically or laterally, and upper and lower rolls are provided between the front and rear housings after the disc housing and the lower clamp bracket are displaced. A roll changing device for a piercing mill, wherein a roll loading / unloading space for stacking and loading the upper and lower cradle is formed.