JP2983126B2 - Roll 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 roll mill. More specifically, the present invention relates to a roll mill such as a three-roll mill used for rolling pipes, bars and wires.

[0002]

2. Description of the Related Art Roll mills sometimes change rolls for size change and maintenance.
Changing the rolls of a roll mill is generally very time consuming and complicated in maintenance. An example of a three-roll mill is shown in FIGS. The illustrated three-roll mill is of a type in which one rotary input shaft 51 is used to distribute rotational power by two sets of bevel gears 52, and three rolls 53 are set at equal intervals in a circumferential direction in the same plane. The housing that holds the rotation input shaft 51 and the roll 53 is divided into two pieces, and is configured to fasten the two halves 54 and 55 with a tie rod 56.

[0003]

In the above-described three-roll mill, when the rolls are replaced, the housing halves 54 and 55 must be separated at the central mating surface 57 and then the rolls 53 must be extracted. It takes extra time to separate the components, and if the housing is separated into two pieces, all the components are disjointed, so re-assembly or maintenance requires a lot of man-hours, as described above. I was

[0004] In view of such circumstances, an object of the present invention is to provide a roll mill in which rolls can be easily changed.

[0005]

According to the present invention, there is provided a roll mill comprising:
An inner housing for holding a plurality of roll units and an outer housing for detachably holding the inner housing, the inner housing supporting each roll unit at equal intervals in a circumferential direction around a pass line. A frame that is immovably fixed in the direction of the pass line, is movable in the radial direction around the pass line, and can be pulled out radially outward, and the outer housing includes the inner housing in the outer housing. And a press-down device and a roll balance cylinder are mounted at positions corresponding to each roll unit of the inner housing in a fixed state.

[0006]

According to the present invention, when the clamp cylinder is released, the inner housing can be taken out of the outer housing in the direction of the pass line. The roll unit is still held in the taken-out inner housing, but since the roll-down device and the roll balance cylinder are still attached to the outer housing, if the roll unit is pulled out radially around the pass line, The roll unit can be taken out of the inner housing without interfering with the rolling device or the roll balance cylinder. After this, the roll can be changed simply by inserting a new roll unit into the inner housing. In this case, since it is not necessary to disassemble the housing, the number of man-hours can be reduced and the work can be completed in a short time.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a front view of a three-roll mill to which the present invention is applied, FIG. 2 is a front view of an outer housing 1, FIG. 3 is a plan view of an inner housing 2, FIG.
FIG. 5 is a perspective view of the roll unit 3.

First, the outer housing 1 will be described with reference to FIG. The outer housing 1 is composed of a ring-shaped frame 10, and six cradles 11, 12,
13, 14, 15, and 16 are formed. Two clamp cylinders 4 (see FIG. 6) for fixing an inner housing 2 described later are mounted on the front side and the back side between the receiving tables 14 and 15 of the frame body 10. 4a is a piston rod of the clamp cylinder 4. Furthermore, three roll balance cylinders 5 are provided at equal intervals in the circumferential direction.
The roll-down devices 6 are mounted on both sides of each roll balance cylinder 5. 5a
Is a piston rod of the roll balance cylinder 5, and a large diameter portion 5b for engagement is formed at the tip thereof.
A known device such as a screw type or a hydraulic cylinder type is used as the pressing-down device 6.

Next, the inner housing 2 will be described with reference to FIGS. The inner housing 2 is formed by fixing two frames 21 and 22 formed in a substantially Y-shape with three stays 23 at a central portion, and has three roll unit accommodating portions 24, 25 and 26. I have. Roll unit storage section 2
4, 25 and 26 are located at 120 degree intervals in the circumferential direction, and both sides of their heads are formed on an inclined surface, and the contact portions 24a
, 24b, 25a, 25b, 26a, 26b. In each of the roll unit housings 24, 25, and 26, the inner peripheral surfaces of the pair of frames 21 and 22 have a roll chock described later.
Sliding surfaces 21a and 22a are formed to guide the side surface of the base 31 up and down freely.

FIG. 5 shows the roll unit 3. The roll unit 3 includes a pair of roll chocks 31 that pivotally support the roll 30, and cutout portions 32 are formed on both upper side surfaces of each roll chock 31. Reference numeral 33 denotes a roll balance beam, and two beams 34 engaging with the notch 32 are provided.
And a block 36 connecting them and forming an engagement groove 35 on the upper surface. The longitudinal direction of the engagement groove 35 coincides with the direction along the pass line. The shafts 37 of the rolls 30 are all input shafts and have a coupling 38 at one end for connection with a transmission shaft 39 as shown in FIGS.

FIG. 7 shows a state where the roll unit 3 is housed in the inner housing 2. The roll units 3 are accommodated in the respective roll accommodating sections 24, 25 and 26, and the roll chock 31 is a frame as shown in FIG.
The sliding surfaces 21a and 22a are inserted into the sliding surfaces 21a and 22a. Since the roll unit 3 is sandwiched between the two frames 21 and 22, the roll unit 3 is restrained from moving in the pass line direction. In FIG. 8, reference numeral 4 indicates the position of the clamp cylinder 4, reference numeral 5 indicates the position of the roll balance cylinder 5, and reference numeral 6 indicates the position of the screw-down device with virtual lines.

FIG. 1 shows each roll unit 3 as described above.
2 shows a state in which the inner housing 2 into which is inserted is assembled into the outer housing 1. At this time, as shown in FIG. 6, the horizontal beams 27 of the frames 21, 22 constituting the roll accommodating portion 24 of the inner housing 2 are pushed down by the piston rod 4a of the clamp cylinder 4, and as shown in FIG. To the two contact portions 25b of the inner housing 2,
The inner housing 2 is fixed to the outer housing 1 by the abutment of 26a on the receiving bases 11 and 12 of the outer housing 1. Of course, the inner housing 2 is held concentrically with the outer housing 1 by the abutment of the abutment with another abutting portion.

As shown in FIG. 5, the piston rod 5a of the roll balance cylinder 5 engages with the engagement groove 35 of the roll balance beam 33 in the above-mentioned mounted state, and
, While the rolling down device 6 is a roll chock 31
By pressing the roll balance 31 in the opening / closing direction (radial direction with the pass line as the center) by adjusting the roll balance cylinder 5 and the rolling device 6 since the pressing is performed in the pressing direction, the rolling reduction amount is adjusted. Can be.

The operation of exchanging rolls for the above three-roll mill will be described.
And pull out the inner housing 2 in the pass line direction. At this time, since the engagement groove 35 of the roll balance beam 33 coincides with the direction of the pass line, the inner housing 2 can be pulled out without removing the roll balance cylinder 5. Although not shown in FIG. 1, the inner housing 2 may be pulled out while supporting the inner housing 2 using a crane with the pass line direction vertical, or the inner housing 2 may be set with the pass line direction horizontal. It is preferable to provide a rail or a hydraulic cylinder for supporting and pulling out to facilitate the operation.

FIG. 9 shows the inner housing 2 thus pulled out. Inner housing 2
The roll unit housings 24, 25, and 26 have nothing to interfere with the outside in the radial direction centering on the pass line, so that each roll unit 3 can be easily moved to the outside without any special preparation work. Can be withdrawn. It is preferable to provide an appropriate stopper for preventing the roll unit 3 from slipping off the inner housing 2 before the roll unit 3 is pulled out artificially.

The roll unit 3 is in a state in which the roll balance beam 33 is engaged with the roll chock 31. Thereafter, the roll balance beam 33 is removed or stored as it is. Then, a new roll unit 3 is inserted into the inner housing 2. This operation can be easily performed only by inserting the roll unit radially inward. As described above, the inner housing 2 to which all the roll units 3 are mounted is housed in the outer housing 1 and pressed by the clamp cylinder 4 to complete the mounting.

As described above, according to the present embodiment, the roll can be changed only by attaching and detaching the inner housing 2 by operating the clamp cylinder 4 and inserting and pulling out the roll unit 3 with respect to the inner housing 2, so that the operation is very simple. Yes, the labor and time of the roll change operation can be greatly reduced.

Although the above-described embodiment is for a three-roll mill, a substantially similar configuration can be applied to a four-roll mill.

[0019]

According to the present invention, the labor and time required for the roll unit replacement work can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a three-roll mill according to one embodiment of the present invention.

FIG. 2 is a front view of the outer housing 1. FIG.

FIG. 3 is a plan view of the inner housing 2. FIG.

4 is a front view of the inner housing 2. FIG.

FIG. 5 is a perspective view of the roll unit 3.

6 is a side view showing a clamp cylinder 4, a roll balance cylinder 5, and a roll chock 31. FIG.

FIG. 7 is a front view of the inner housing 2 on which the roll unit 3 is mounted.

FIG. 8 is a partial plan view of the inner housing 2 to which the roll unit 3 is mounted.

FIG. 9 is an explanatory diagram of the inner housing 2 and the roll unit 3.

FIG. 10 is a plan view of a conventional three-roll mill with one side of a housing removed.

FIG. 11 is a side view of the three-roll mill of FIG.

[Explanation of symbols]

1 outer housing 2 inner housing
3 roll unit 4 clamp cylinder 5 roll balance cylinder 6 reduction device 30 roll 31 roll chock
35 Engagement groove 33 Roll balance beam

Claims (2)

(57) [Claims] 1. An inner housing for holding a plurality of roll units and an outer housing for detachably holding the inner housing, wherein the inner housing comprises:
Each roll unit is supported at equal intervals in the circumferential direction around the pass line, and is fixed so as not to move in the pass line direction, so that it can move in the radial direction around the pass line and can be pulled out radially outward. A frame for holding the outer housing, a clamp cylinder for accommodating and fixing the inner housing in the outer housing, and a press-down device at a position corresponding to each roll unit of the fixed inner housing. And a roll balance cylinder. 2. The roll mill according to claim 1, wherein said inner housing holds three roll units.