JP3395651B2 - Roller device for transport and steel tube rolling mill provided with the same - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to is incorporated into a rolling mill stand, the conveying roller equipment capable of controlling the height of the conveying line, to 3 roll steel mill provided with it.

[0002]

2. Description of the Related Art Seamless steel pipes are made from heated round steel pieces.
For example, it is manufactured using a piercer piercing and rolling mill, a mandrel mill and a sizer or a stretch reducer rolling mill (hereinafter, simply referred to as "steel pipe rolling mill").

In the mandrel mill, a mandrel bar is inserted through the hollow portion of a hollow shell made from a round steel piece by a piercing and rolling machine or the like, and the mandrel bar is rolled by a hole-type roll to reduce the thickness, and a semi-finished product or a product This is a facility for manufacturing seamless steel pipes.

The steel pipe rolling machine is a rolling machine for reducing the outer diameter of a raw pipe rolled by a mandrel mill to finish it into a final product size. There are a three-roll type and a two-roll type in its type.
The present invention is directed to a 3-roll type.

In the three-roll steel pipe rolling machine, three rolls each having an outer peripheral surface of a cylinder grooved into an arc shape of about 1/3 are arranged at 120 ° intervals in the same plane to form one circular hole type, This is a rolling mill that reduces the outer diameter of the raw pipe. Then, each roll is incorporated into one housing so that it can be driven, and further, this housing is exchangeably incorporated into the rolling mill stand. The rolling mill stand of the steel pipe rolling mill usually reduces the diameter of the roll hole die of each stand so that one size of steel pipe can be reduced in size by 5 to 20 stands, and the front and rear stands have a plane perpendicular to the rolling line. It is installed 60 degrees apart. Therefore, if the size of the product to be rolled changes, all the rolls of each rolling mill stand must be changed.

Recently, the demand for a seamless steel pipe having a large outer diameter has increased, and in order to manufacture a multi-sized steel pipe product from a single raw pipe by a method of passing from a mandrel rolling mill to a steel pipe rolling mill, a multi-stand steel pipe is used. Need a rolling mill. However, all stands are used only when producing the product steel pipe with the smallest diameter, and when producing steel pipes with larger diameters, the latter stand side does not roll, so
It is simply used as a stand for transporting rolled material.
This must incorporate a housing that incorporates a roll of holes that is larger than the product size.

For example, when a 12-stand steel pipe rolling machine is used to perform constant-diameter rolling from a blank pipe having a diameter of 210 mm, a diameter of 140 mm
It is possible to manufacture steel pipe products up to 190 mm. Then, rolling usually starts from a product with a diameter of 140 mm, and at 140 mm, all 12 stands are used for rolling. However, for a diameter of 154 mm, 10 upstream stands are used for rolling, for 170 mm, 8 upstream stands, and for 182 mm, 6 upstream stands and 1 stand.
At 90 mm, 5 stands on the upstream side will be used for rolling. That is, when rolling a product with a diameter of 190 mm,
A housing incorporating a roll having a hole type with a diameter of about 200 mm is inserted into the seven stands on the downstream side, and this is used as a conveying roller.

[0008]

As described above, in the multi-stand steel pipe rolling machine, the housing used as the conveying roller needs a roll having a hole-shaped diameter corresponding to the change in the diameter of the product, which is possessed. The number of rolls to be increased increases.

An object of the present invention is to provide a device that can be incorporated in a rolling mill stand as a dedicated conveying roller to reduce the number of hole type rolls owned and the number of roll changes.

[0010]

SUMMARY OF THE INVENTION The present inventors have attached a conveying roller to a support base (elevating device) whose height can be adjusted,
It was confirmed that the above problems could be solved by incorporating this into a rolling mill stand, and the present invention was completed. The gist of the present invention resides in the following conveying roller device shown in FIG. 1 and the following three-roll steel pipe rolling machine provided with it.

[0011] 3 A transport roller device incorporated in the rolling mill stand roll steel mill, a conveying roller axial section of the circumferential portion is formed in a V-shaped or curved, rolling mill stands The elevator includes a lifting device that is lifted and lowered by a pressure reducing device, and a base to which the lifting device is fixed. The conveyor roller is placed on the elevator device via a shaft box, and one end of the conveyor roller shaft is a transport roller device characterized by being connected to a drive shaft provided horizontally in rolling mill stand via the connecting shaft and the universal joint can stretch. The elevating device 5 is moved up and down by the rolling down device 26 provided on the rolling mill stand.

[0012] a conveyance roller axial section of the circumferential portion is formed in a V-shaped or curved, a lifting device that is moved upward and downward by a pressure device provided in rolling mill stands, the lifting device is fixed and a base, together with the conveying roller is mounted on the lifting device via the axle boxes are provided horizontally in rolling mill stand via the connecting shaft and the universal joint can stretch the end of the conveying roller shaft A three-roll steel pipe rolling mill, wherein the three-roll steel pipe rolling mill is connected to a drive shaft, and the elevating device is provided above a rolling device of a rolling mill stand via a height adjusting device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Here, a case will be described in which a conveying roller device of the present invention is installed in a three-roll sizer rolling mill, which is a typical example of a steel pipe rolling mill.

1A and 1B are views showing an example of a carrying roller device of the present invention incorporated in a rolling mill stand. FIG. 1A is a partial sectional view seen from the rolling direction, and FIG. 1B is a side view of a carrying line. It is the side view seen.

FIG. 2 is a detailed view of the structure shown in FIG. 1 (a), and FIG. 3 is a detailed view of the structure shown in FIG. 1 (b).

The function of the conveying roller device of the present invention will be described with reference to FIGS. 1, 2 and 3.

A conveying roller 1 having a circumferentially curved axial section is fixed to a roller shaft 2, and the roller shaft is linked to a lifting device 5 via a shaft box 4 having a bearing 3 therein. Ten
Is attached to. One end of the roller shaft 2 is connected to a drive shaft 28 of a drive device of the rolling mill via a connecting shaft 7 having universal joints 6 at both ends.

The lifting device 5 is a link mechanism using the principle of "lever", and has a structure in which one link 8 is pushed up from below by a height adjusting device 31. The connecting shaft 7
It can be expanded and contracted in the axial direction, and when the shaft 2 of the conveying roller is pushed up by the elevating device 5, the space between the two universal joints 6 is expanded and contracted to rotate. The height adjusting device 31 is a rolling down device of the rolling mill (reference numeral 2 in FIG. 5 described later).
6), and the drive shaft 28 is the drive shaft of the roll of the rolling mill (see reference numeral 28 in FIG. 5 described later).

Next, the lifting device of the present invention will be described.

In FIG. 3, the lifting device 5 has four links 8, 9, 10 and 11 assembled in a sigma (Σ) shape so as to obtain a large enlargement ratio in a narrow space.

The link 8 is composed of two plates, one end of which is fixed to the fulcrum shaft 13 and the other end of which is fixed to one end of one link 9 through a pin 14 at an angle. There is. The fulcrum shaft 13 is rotatably supported by two supporting bases 17 provided on the base 30. A height adjusting device is provided on the lower surface of the link 8 (see reference numeral 31 in FIG. 2 described above).
2 is provided with a receiving seat 33 for receiving the loading portion (see reference numeral 32 in FIG. 2 described above).

The link 10 is composed of two plates, one end of each of which is fixed to a fulcrum shaft 16, and two
It is fixed to one end of each of the links 11 at an angle. The fulcrum shaft 16 is rotatably fixed to two support bases 12 provided on the rolling mill stand frame. Link 10
Axial boxes 4 supporting the conveying rollers 1 are mounted on the upper surfaces of the respective. Although the link 10 is supported by the rolling mill stand by the support base 12, there is a possibility that vibration will occur when the transport roller is rotated. Therefore, a support base 18 is provided on the lower surface of one side of the link 10, a balance cylinder 19 composed of a hydraulic device is connected, a load is applied to the link mechanism in advance to eliminate the gap, and the vibration is not generated. The balance cylinder 19 has one end fixed to the base 30 and the end of the lot to the support 18 by pins.

The link 9 and the link 11 are rotatably attached by a fulcrum shaft 15, and the links 8, 9, 10 and 11 form a sigma (Σ) -shaped link mechanism.

FIG. 4 is a diagram showing the movement of each link of the lifting device. The link 8 and the link 9 are integrated, and the link 11 and the link 10 that are also integrated are pushed up to move the axle box 4 in an arc shape. For example, the distance between link fulcrums is 360 mm for link 8 and 190 mm for link 9.
The link 11 has a length of 150 mm, the link 10 has a distance of 376 mm between the fulcrum shaft 16 and the conveying roller shaft 2, and the link 8 has a fulcrum shaft 13
When the position of 130 mm from the position (the position of the arrow h in the figure) is pushed up by 1 mm, the center of the conveying roller is raised by about 4 to 5 mm. Figure 4
As shown in, the center of the shaft 2 of the transport roller is adjusted in height by changing the position in the front-back direction with respect to the transport direction, but the center in the direction perpendicular to the transport direction does not change.

Next, a steel pipe rolling machine capable of incorporating the conveying roller equipment of the present invention will be described.

FIG. 5 is a partial sectional view of the steel pipe rolling mill as seen from the rolling direction.

The steel pipe rolling mill 20 comprises three steel pipe rolling mill rolls 21 each having a groove having an arcuate section in the circumferential portion of the roll, a housing 22 for accommodating the three steel pipe rolling mill rolls, and a steel pipe rolling mill. It consists of a connecting shaft 23 that drives the rolls.

The steel pipe rolling mill roll 21 is supported by a bearing device 24 having a built-in bearing, and the connecting shaft 23 is connected to a rolling mill stand 27 by a drive shaft 28 and a universal joint 29.
Are linked by. Further, the housing 22 can be removed from the rolling mill stand 27 by removing the universal joint 29 and disconnecting the connection shaft 23 and the driving shaft 28 of the rolling mill stand.

In the conveying roller device of the present invention, as described above, the housing 22 in which the rolls of the steel pipe rolling mill are installed is removed from the rolling mill stand 27 and exchanged in the same manner as the roll changing work. The equipment is capable of driving the conveying roller and adjusting the height by using the drive shaft and the vertical pressing device.

[0030]

The carrying roller device of the present invention can be easily incorporated in a stand of a steel pipe rolling mill, and the height of the carrying roller can be changed. Therefore, a single conveying roller device can roll steel pipe products of various sizes, so that the roll change frequency and the number of rolls held can be reduced.

[Brief description of drawings]

1A and 1B are views showing an example of a transportation roller device of the present invention incorporated in a rolling mill stand, in which FIG. 1A is a partial cross-sectional view seen from a rolling direction, and FIG. 1B is a side view seen from a side surface of a transportation line. It is a figure.

FIG. 2 is a diagram showing in detail the structure of an example of the carrying roller device of the present invention as viewed from the rolling direction.

FIG. 3 is a diagram showing in detail the structure of an example of the carrying roller device of the present invention as viewed from the side of a carrying line.

FIG. 4 is a diagram showing a moving state of each link of the lifting device.

FIG. 5 is a partial cross-sectional view of the steel pipe rolling mill as viewed from the rolling direction.

[Explanation of symbols]

1. Transport roller 2. Roller shaft 3. bearing 4. Axis box 5. Lifting device 6. Universal joint 7. Connecting shaft 8,9,10,11. Link 12. Support 13. Support axis 14． Pins 15,16. Fulcrum axis 17,18. Support stand 19. Balance cylinder 20. Steel pipe rolling machine 21. Steel pipe rolling machine roll twenty two. Housing 23. Connecting shaft 24. Bearing device twenty five. Support shaft 26. Drive shaft 27. Rolling mill stand 28. Drive shaft 29. Universal joint 30. Base 31. Height adjustment device 32. Loading section 33. Seat

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Claims (2)

(57) [Claims] 1. A 3 A transport roller device incorporated in the rolling mill stand roll steel mill, a conveying roller axial section of the circumferential portion is formed in a V-shaped or curved, rolling The elevator includes a lifting device that is lifted and lowered by a reduction device provided on a machine stand, and a base to which the lifting device is fixed. The transport roller is placed on the elevator device via a shaft box, and the transport roller shaft transport roller and wherein the one end of which is connected to a drive shaft provided horizontally in rolling mill stand through the universal connecting shaft can expansion joint. 2. A conveyor roller axial section of the circumferential portion is formed in a V-shaped or curved, a lifting device that is moved upward and downward by a pressure device provided in rolling mill stands, the lifting device is fixed and a base which is, together with the conveying roller is mounted on the lifting device via the axle boxes, horizontally to the rolling mill stand via the connecting shaft and the universal joint can stretch the end of the conveying roller shaft A three-roll steel pipe rolling mill, wherein the three-roll steel pipe rolling machine is connected to a drive shaft provided, and the elevating device is provided above a rolling device of a rolling mill stand via a height adjusting device.