JPS62224409A - Roll - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a rotary hollow roll having a circumferential surface of an operating roll, and an end portion that axially penetrates the inner circumferential surface of the hollow roll and on which an external force acts. a fixed crosshead having a fixed crosshead; a hydraulic device provided on the crosshead and supporting the hollow roll;
The present invention relates to a roll including bearings provided at each end of the hollow roll to rotatably support the crosshead relative to the hollow roll and allow lubricant to flow therethrough.

PRIOR ART A conventional roll is known from DE 31 28 140, in which a packing device is mounted on the surface of the crosshead to partition a longitudinal chamber formed between the hollow roll and the crosshead. ing. This packing device has end cross packings provided at opposite ends of the longitudinal chamber and longitudinal arm packings extending over the crosshead and hollow rolls on both sides of the working surface of the rolls. .

The known roll is similar to the /4', /king structure of the so-called "70-Ting roll" down to the details. A feature of the known roll is that the liquid leaking from the end cross packing, which does not need to be sealed liquid-tight, is absorbed by the end cross packing. It is used to lubricate. The pressure fluid is usually pressure oil.

When the "70-ting roll" is operated at room temperature,
This pressure oil is used not only as a pressure fluid but also as a lubricating fluid for bearings.

Floating rolls are often heated and used. That is, the pressure oil is heated to a high temperature. This roll is particularly well suited for heating for the following reasons. That is,
Although it is possible to increase the cross section to allow the heat medium to pass through, if the flow of the heat medium is appropriately controlled, the temperature can be uniformized over the entire length of the roll. Specifically, in a longitudinal chamber (pressure chamber) installed on the side of the roll gap, the pressure liquid flows in one direction along the d-ru, and in a longitudinal chamber (t, This temperature equalization can be achieved because the flow is in the opposite direction within the chamber.

However, there is a limit to the temperature that can be obtained with ordinary floating rolls. In other words, normal pressurized fluids lubricate bearings well at normal temperatures, but break down at high temperatures. In contrast, pressurized fluids that can withstand high temperatures do not have sufficient lubricity. If heating is required in the case of a known construction and the same liquid is used for applying pressure, for supplying heat, and for lubricating bearings, currently known liquids. However, there is a problem in that the temperature cannot exceed a certain limit.

Other embodiments of the rolls mentioned at the outset are also known.

In the case of such rolls, the hydraulic device used to support the hollow roll with the crosshead has a different configuration from the above-mentioned known example, and uses hydraulic fluid to drive itself and at the same time lubricate the bearings. Use. The device of DE 2420324 has a plurality of piston-like hydraulic pressure elements which are placed in the crosshead and act on the inner circumferential surface of the hollow roll. Oil leakage from this pressure element serves as lubrication.

In the case of DE 2902956, a spraying device is also provided, by means of which the heated oil can be directed onto the inner circumferential surface of the hollow roll.

[Problems to be Solved by the Invention] The present invention provides a hollow roll that forms the circumferential surface of the working roll and rotates around the roll, and a hollow roll that passes through the hollow roll in the longitudinal direction at a distance from the inner peripheral surface of the hollow roll. In addition, there is a fixed crosshead whose end to which external force is applied protrudes from the hollow roll, a hydraulic device installed on the crosshead to support the hollow roll, and a rotatable support for the crosshead relative to the hollow roll. In a roll comprising bearings provided at both ends of the hollow roll and through which lubricant flows, a longitudinal If the temperature of the heating medium in the direction chamber is 260
The purpose is to maintain the temperature between 270°C and 270°C.

[Means for Solving the Problems, Actions, and Effects of the Invention] The above object is to provide a hollow roll with a small length portion as the outer diameter becomes farther away in the axial direction; an extension portion on the first roll; a bell-shaped casing consisting of a region of large inner diameter that fits with the hollow roll; and a region of small inner diameter that extends axially from the opposite end of the hollow roll in the opposite direction and on which an external force acts on the outer periphery; A bearing is provided between the outer circumferential surface reference of the crosshead and the inner circumferential surface of the large inner diameter area well A of the bell-shaped casing 1; a lubricating oil supply hole and a discharge hole are provided in the bearing; the end of the crosshead extends with radial clearance to the area of small internal diameter of the bell-shaped casing; between the free end of the extension and the bell-shaped casing, it seals off any liquid that may form between the extension and the crosshead. Do/'P Set up a tsuking;
This is achieved by configuring the outer end portion of the cross head donner to be a reduced diameter end, forming a guide portion that fits tightly into the small inner diameter region of the bell-shaped casing.

Furthermore, regardless of the structure of the device, the liquid that transfers heat in the gap between the hollow roll and the crosshead,
It can be separated from the lubricant for bearings, and there is a gap between the hollow roll and the crosshead that is large enough to prevent heat from being transferred from the heated heat medium to the lubricant.

To make this possible, the bearing is placed outside the extension of the hollow roll and is radially separated from the heating medium which is inside the hollow roll and the extension. that time,
The actual amount of heat transfer medium remains between the end cross packings in the hollow roll, and in some cases a small amount of heat transfer medium enters the gap between the crosshead and the inner circumference of the extension, but this heat transfer The medium is actually recessed in front of the packing located at the end of the extension, and no appreciable flow or heat transfer occurs in this area.

The bearing is also radially separated from most of the heat transfer medium. This is because, for structural reasons, there is a spacing between the end cross-packing collar in the hollow roll and the area where the bearing engages the radially adjacent extension of the hollow roll. Heat flow from the heated area of the hollow roll to the bearings is therefore strongly inhibited. Furthermore, the bearings are constantly refreshed and are not involved in heat transfer, so they are subject to the cooling effect of cold lubricant.

The advantage of arranging the bearings according to the invention is that by removing the bell-shaped casing axially on the outer surface of the extension, the crosshead and the hollow roll can be removed without separating them.
The reason is that the bearing can be easily released.

There is a reason why external forces act in a bell-shaped area with a small internal diameter. This is because this region can be given a small outer diameter corresponding to the inner diameter. That is, when the bell-shaped casing installed on the outer bearing is supported in a machine, etc., it is structurally important that the outer diameter of the outer bearing is smaller than the outer diameter of the hollow roll.

A tapered shear extension attached to the end of a hollow roll is known from European Patent Publication No. 43119. A bearing is mounted on the outer surface of this extension and is supported within the bell-shaped casing. The difference with the present invention is that the bell-shaped casing is external to the bearing and is not supported in axial alignment at the cylindrical end of the crosshead extending into the bearing. The casing surrounds a hollow support member which extends into the interior of the extension, in turn towards the hollow roll, within which the ends of the crossheads are aligned when the cross-rad is bent. It is held by bearings that allow for misalignment. There is nothing mentioned in the above-mentioned European Patent Publication No. 43119 about feeding the pressurized/heating medium and the bearing lubricant separately.

It is necessary to hold the bell-shaped casing on the support without play. The purpose is to prevent torques from being applied to the bearings on the bell-shaped casing in the area of the bell-shaped casing with a large internal diameter when the roll is loaded. The dimensions of the support are preferably equal to the distance between the end of the region of small internal diameter on the hollow roll side and the center of the bearing.

In order to prevent heat transfer of the heated pressurized heat medium into the crosshead and further in the direction of the bearings, it is desirable to provide the conduits in the crosshead in a thermally insulated manner.

It is expedient that the packing installed at the end of the extension is a sliding ring packing. This is because even if a misalignment occurs between the crosshead and the extension part on which the load is applied due to bending of the crosshead inside the hollow roll, the misalignment can be adjusted using the slide ring and locking. It is.

The heat transfer medium reaching the slide ring packing tends to gelatinize on the sliding surface under the influence of oxygen in the air, but if this continues for a long time, it will impair the sealing effect. To prevent this, it is preferable that the surface is in an inert gas atmosphere. For example, nitrogen can be considered as the inert gas.

A sealing ring is preferably provided to prevent liquid having a moderate temperature from flowing excessively into the gap between the extension and the crosshead. This sealing ring is a rough packing, so that most of the incoming liquid is returned to the gap between the crosshead and the hollow roll. The liquid is sucked there.

Since the amount of liquid that enters near the sealing ring that holds back most of the liquid through the gap between the extension and the crosshead is small, the amount of heat from the inflow is released from the incoming liquid to the surrounding components. It will not be done.

In the case of a 70-inch roll, the heated pressure and heat medium flows through the pressure chamber in the longitudinal direction.

At the end opposite the inlet, the liquid flows into a leakage chamber opposite the pressure chamber, where it flows back. it is,
This is to draw the liquid into a pressure chamber opposite the inlet. Thus, the liquid flows in opposite directions to equalize the temperature. There is usually no end cross arm or king on the side of the leak chamber. In this case, a sealing ring is used to prevent the flowing still hot exudate from entering the leak chamber.

[Embodiments] Hereinafter, the present invention will be explained based on examples with reference to the drawings.

The roll 10 has a fixed crosshead 1 in the form of a substantially solid cylindrical carrier. The hollow roll 2 rotates as the crosshead 1 rotates. A space is provided between the inner peripheral surface 3 of the hollow roll 2 and the outer peripheral surface 4 of the crosshead 1. This cylindrical gap provided between the inner circumferential surface 3 of the hollow roll 2 and the outer circumferential surface 4 of the crosshead 1 is divided into two longitudinal chambers 5, 6, the former being a pressure chamber and the latter being a pressure chamber. It is a leak chamber. Further, while the former is formed on the side of the roll gap f7, that is, on the side of the counter roll 8, the latter is formed on the opposite side of the former. Cylindrical gap is vertical) Arm, King 9
partitioned by.

This longitudinal packing 9 is installed in the crosshead l, and is in liquid-tight contact with the inner peripheral surface 3 of the hollow roll 2, and is installed on both sides of the crosshead 1 at the maximum diameter part of the crosshead 1. ing. In the drawing, longitudinal packing 9
It has only the front part of the head. Vertical chamber 5
(pressure chamber) is closed at both ends by end cross packings 11. The end cross packing 11 has the shape of a half ring in the embodiment and extends into the upper half of the rad 1 into the cross. End cross no J?
The outer peripheral surface of the packing 11 is in contact with the inner peripheral surface 3 of the hollow roll 2. The end crossbar king 11 extends to a guide pin 12. The f-id pin 12 is a surface on which the resultant force exerted by the pressure fluid in the longitudinal chamber 5 acts perpendicularly to the axis of the crosshead 1. It extends into the working plane.

This plane of action often corresponds to a plane containing the axis of the hollow roll 2 and the axis of the counter roll.

The end cross head 11 has a substantially rectangular cross section and rests on its negative side against the step 13 of the cross head l;
The other side rests against the side surface 14 of a retaining ring 15 which is fixed to the crosshead 1 by means of a guide pin 12.

Vertical direction z installed on both sides of the crosshead 10! The Y king 9 forms a closed pressure chamber 5 together with end crossbars and kings 11 installed at both ends of the hollow roll 20. The pressure chamber 5 can be supplied with fiQμ heating medium via an insulated conduit 16 extending to an inlet 17 formed in the upper side of the crosshead 1. 70 The heat transfer medium flows in the pressure chamber 5 to the right in the drawing, and near the right end of the longitudinal chamber 5 passes through a transverse passage into the leak chamber 6, where it flows from the right to the left. flows. This is because the ytl-thermal medium is sucked in again at the outlet 18 and the outlet passage (not shown). The leak chamber 6 may also be filled with pressurized fluid. In that case, the leak chamber 6 has end cross packing. However, then the pressure within the leak chamber 6 is lower than that of the pressure chamber. roll gear, g2
The pressure difference in both longitudinal chambers 5, 6 is important in order to apply a line pressure to the .

However, in the illustrated embodiment, the left side of the leakage chamber 6 is not delimited by an end-cross packing. The pressure fluid thus flows to the left past the step 13 of the crosshead 1 through the vicinity of the outlet 18. most of the ly
A sealing ring 19 is provided so that the full heating medium remains within the leakage chamber 6. The sealing ring 19 returns the flowing liquid to the leakage chamber 6 where it is connected to the outlet 18.
It is sent to.

For example, in the case of rolls with a series of pressure elements acting on the inner circumferential surface 3 of the hollow roll 2 and not in the case of 70-inch rolls, a longitudinal chamber (pressure chamber) 5 which is sealed in a liquid-tight manner is required. I don't. That is, both the longitudinal packing 9 and, depending on the case, the end cross packing 11
It is also possible to omit it. There is also no inflow to the left due to the return ring or sealing ring 19. Crosshead 1 and hollow roll 2
There is a pressure fluid in the gap between the two, which flows out from the pressure element and/or the heating element.

The pressure element and the heating element are located in the area of the gap illustrated at the far right in the drawing. However, the structure described below in the left-hand region of the return ring or sealing ring 19 is the same as in all embodiments based on the generic concept.

A sleeve-shaped or bush-shaped extension 20 is fixed to the end face of the hollow roll 2 so as to follow the hollow roll 2. The diameter of the outer peripheral surface 23 of the extension part 20 is also smaller than the outer diameter of the hollow roll 2. The inner circumferential surface 21 of the extension portion 2Q is the outer circumferential surface 22 of the small diameter portion of the crosshead 1 that protrudes from the hollow roll 2.
It is separated by a small gap 24 from. The reason why a small amount of heating medium flows into the gap 24 from the leakage chamber 6 is as follows.
This is the case when it gets over the return ring 19. but,
In the gap 24 no significant flow occurs.

This is because the left end of the gap 24 is closed by the slide ring/gucking 25 in the drawing. The slide ring 25 includes a slide ring 26 whose inner circumferential surface is spaced apart from the outer circumferential surface of the cross rod 1, a counter ring 27 connected to the end surface of the extension 2θ, and a guide ring 28. has. The guide ring 28 holds the slide ring 26 in place and is sealed by a metal bell 29. The metal follower 29 is fluid-tightly connected to the guide ring 28 at one axial end, and connected to the retaining ring 3 at the other axial end. This retaining ring 31 is fixed within a cylindrical recess 32 of the bell-shaped casing, generally indicated at 30. In the embodiment, the bell-shaped casing 30 is divided into two parts, having a region 33 with a large inner diameter and a region 34 connected therewith with a smaller inner and outer diameter. The former is located on the side of the hollow roll 2 and has a slightly smaller outer diameter than the hollow roll 2, whereas the latter has a cylindrical inner peripheral surface 35 that fits into the cylindrical end 1' of the crosshead 1 without any play. are combined. The support portion 36 is formed by this arrangement. This support part 36Fi, even if the bell-shaped casing 30 is loaded radially outside the area 34, the crosshead 1
and the axis of the bell-shaped casing 30. Such a load is generated by a bearing 40 which is installed between the inner circumferential surface 37 of the area 33 of the bell-shaped casing 30 and the outer circumferential surface 23 of the extension 20 and which is placed on this bearing 40. A hollow roll 2 is rotatably supported at a bell-shaped casing 30. The crosshead 1 housed inside the hollow roll 2 bends when a load is applied, and the bell-shaped casing 30 also bends accordingly, but the hollow roll 2 does not bend. This is because the bell-shaped casing 30 is firmly in contact with the cross rod l by the support part 36, so both bend, but since the bearing 40 is a self-aligning bearing, the outer peripheral surface of the extension part 2° This is because even if a misalignment occurs between 23 and the inner circumferential surface 37 of the bell-shaped casing 3o, it can be adjusted.

The external force is applied to the end 1' of the crosshead 1 projecting from the hollow roll 2 in the area 34 of the bell-shaped casing 30, more specifically via a self-aligning bearing 39. This self-aligning bearing 39 is located on the outer peripheral surface 3 of the bell-shaped casing 30.
However, unlike the self-aligning bearing 40, it is not a rotating type, but is stationary like the bell-shaped casing 30 and the crosshead 1. Bell-shaped casing 30
Since the diameter of the outer peripheral surface 38 of the area 34 is smaller than the diameter of the hollow roll 2, the outer diameter of the self-aligning bearing 39 is also smaller than the diameter of the hollow roll 2.
It is also possible to make the outer diameter smaller. This is desirable for structural reasons.

With the structure shown, h in the longitudinal chamber 5°6
r = The circulation of the heat medium and the lubrication system for the bearing 40 can be completely separated. December: Even if the heat medium may flow into the gap 24, it is only up to the slide ring 9-king 25. The lubricating oil for the bearing 40 is supplied from above to the supply hole 41 together with the minimum amount of liquid that overflowed from the gap 24 in the slide ring packing 25/C, without creating pressure, i.e. , is sucked downward through the discharge hole 46 without stagnation. Since the liquid remains in the gap 24 and does not flow, it cools very quickly. Therefore, the transfer of heat to the bearing 40 is not significant. Insulation 16' of conduit 16 also helps to prevent heat transfer.

The sliding surface 25/ of the sliding ring mating 25 is annularly surrounded by a chamber 42'.

Nitrogen is supplied to the chamber 42' from a supply 42.

This prevents the heat medium overflowing from the gap 24 at the sliding surface 25' from coming into contact with oxygen in the air and becoming glue-like.

The hollow roll 2 is preferably driven in a simple way, namely by a chain wheel 43 provided at the end of the hollow roll 2.
and a chain wrapped around it.

jL support section 36 needs to have a constant value that can sufficiently support the bell-shaped casing 30 even if a force is applied to the bell-shaped casing 30 by the bearing 40 to tilt it. The dimensions of the guide portion 360 are approximately equal to the distance 44 from the end of the cylindrical inner peripheral surface 35 of the bell-shaped casing 300 on the hollow roll 2 side to the center of the bearing 40;
Moreover, the distance 45 from this center to the two ends of the hollow roll is also approximately equal. In this way, the necessary distance is maintained between the hot area in the region of the longitudinal chamber 5.6 and the bearing 40. Gap 2 between the extension 20 and the end of the crosshead 1
4 has a constant length, so that the heating and heating medium still flowing in stops in this gap 24, and in the area of the bearing 40 there is no longer any significant flow of medium or transfer of heat.

[Brief explanation of drawings]

The drawing is a partial vertical sectional view of the left end of the roll of the present invention. l...Crosshead, 1'...End, 2...Hollow roll, 3...Inner peripheral surface, 4...Outer peripheral surface, 5...Pressure chamber, 6...Leakage Chamber, 7... Roll gap, 8... Counter roll, 9... H direction/4
Tsuking, 10...roll, 11...end cross i4 ykin! , 12... Kite pin, 13... Step, 14... Side, 15... Retaining ring, 16...
4 insulation pipes, 16'... PFr surface member, 17... Inlet, I8... Outlet, 19... Return ring, 20...
Extension portion, 21...inner peripheral surface, 22... outer peripheral surface, 23.
...Outer peripheral surface, 24...Gap, 25...Slide ring twisting, 25'...Sliding surface, 26...Slide ring, 27...Counter ring, 28...
Guide ring, 29...Metal bellows, 30...Bell-shaped casing, 31...Retaining ring, 32...Cylindrical recess, 33...Large inner diameter area, 34...Inner diameter and outer diameter Area with small diameter, 35...inner peripheral surface, 36...
・Support part, 37... Inner peripheral surface, 38... Outer peripheral surface, 39
... Self-aligning bearing, 40 ... Bearing, 41 ... Supply hole, 42 ... Supply section, 42' ... Chamber, 43 ...
... Chain wheel, 44... Distance, 45... Distance, 46... Discharge hole.

Claims (1)

[Scope of Claims] 1. A rotating hollow roll having a circumferential surface of an operating roll arranged in parallel with a counter roll with a roll gap, and an external force passing through the inner circumferential surface of the hollow roll in the axial direction. a fixed crosshead having an end; a hydraulic device provided on the crosshead to support the hollow roll; and a hydraulic device provided at each end of the hollow roll to rotatably support the crosshead with respect to the hollow roll. and a bearing through which lubricant flows: the hollow roll (2) is provided with an extension (20) whose outer diameter becomes smaller as it moves away from the shaft in the axial direction; A bell-shaped casing (33) consisting of an inner diameter region (33) and a small inner diameter region (34) extending axially from the opposite end of the hollow roll (2) in the opposite direction and on which an external force acts on the outer periphery. an outer circumferential surface (23) of the extension (20) and an inner circumferential surface (3) of the large inner diameter region (33) of the bell-shaped casing (30);
A bearing (40) is provided between the crosshead (1) and the bearing (40); a lubricating oil supply hole (41) and a discharge hole (46) are provided in the bearing (40); The small inner diameter area of the bell-shaped casing (30)
34); the free end of the extension (20) and the bell-shaped casing (30
) between the extension (20) and the crosshead (1).
A packing (25) is provided for sealing the liquid generated between the crosshead (1) and the outer end portion of the end of the crosshead (1).
1′), and a support portion (3) that fits into the small inner diameter region (34) of the bell-shaped casing (30).
6) A roll characterized by being formed into. 2. The supporting portion (36) is connected to the small inner diameter region (3).
4) on the hollow roll (2) side and the bearing (40)
The roll according to claim 1, characterized in that the roll is formed to have a length equal to the distance between the roll and the center of the roll. 3. A pressure chamber (5) located on the roll gap (7) side and a leakage chamber (6) located on the opposite side are provided between the crosshead (1) and the hollow roll (2). , the pressure chamber (5) within the crosshead (1).
3. The roll according to claim 1 or 2, characterized in that a heat insulating conduit (16) for guiding a pressurized/heating medium is provided in the roll. 4. The roll according to any one of claims 1 to 3, wherein the packing (25) is a slide packing. 5. The packing (25) has a sliding surface (25'), and an inert gas supply section (42) is provided so that the sliding surface (25') is exposed to an inert gas atmosphere. The roll according to claim 4. 6. A return ring (19) is provided at the end of the hollow roll (2) for returning most of the pressurized/heating medium flowing out from the leakage chamber (6) to the leakage chamber (6). The roll according to any one of claims 1 to 5, characterized in that: