JPH0255645B2 - - Google Patents

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 disposed on the crosshead to support the hollow roll, and a hydraulic device disposed at each end of the hollow roll to rotatably support the crosshead relative to the hollow roll and to allow lubricant to flow through the crosshead. The present invention relates to a roll including a bearing for holding the roll.

BACKGROUND OF THE INVENTION A conventional roll is known from DE 31 28 140 and is mounted on the surface of a packing device crosshead for partitioning a longitudinal chamber formed between the hollow roll and the crosshead.
The packing device has end cross packings at opposite ends of the longitudinal chamber and longitudinal packings extending along the crossheads and hollow rolls on both sides of the working surface of the rolls. The known roll has a packing structure similar to that of a so-called "floating 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 removed by a bearing provided outside the end cross packing and supporting a hollow roll rotatably supported on the crosshead. It is used to lubricate. The pressure fluid is usually pressure oil. When the "floating roll" is operated at room temperature, this pressure oil is used not only as a pressure fluid but also as a lubricating fluid for the 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, it is possible to more effectively equalize the temperature over the entire length of the roll by appropriately controlling the flow of the heat medium. Specifically, the pressure liquid flows in one direction along the rolls in a longitudinal chamber (pressure chamber) installed on the side of the roll gap, and in a longitudinal chamber (leakage chamber) opposite the pressure chamber. This temperature equalization can be achieved by flowing in the opposite direction.

However, in the case of ordinary floating rolls,
There is a limit to the temperature that can be obtained. This means that ordinary pressure fluids lubricate bearings well at normal temperatures, but
It decomposes 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 at the crosshead is of a different construction from the above-mentioned known examples, and at the same time drives itself and at the same time pumps out hydraulic fluid to lubricate the bearings. use The device of DE 24 20 324 has a plurality of piston-like hydraulic pressure elements placed in the crosshead and acting on the inner circumferential surface of the hollow roll. Oil leakage from this pressure element serves as lubrication. In the case of West German Publication No. 2902956, furthermore,
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. a fixed crosshead whose end portion to which an external force is applied protrudes from the hollow roll; and a hydraulic device provided on the crosshead to support the hollow roll;
A roll comprising a crosshead rotatably supported relative to a hollow roll and bearings provided at both ends of the hollow roll for allowing lubricant to flow through the roll. In order to be able to convey the heat medium to the circumference, the temperature of the heat medium in the longitudinal chamber is maintained at 260 to 270°C.

[Means for Solving the Problems, Effects of the Invention] The above object is to provide the first roll with an extension part in which the outer diameter of the hollow roll becomes smaller as it moves away from the roll in the axial direction; A bell-shaped casing is provided, consisting of a mating region of large inner diameter and a region of small inner diameter extending axially from the opposite end of the hollow roll in the opposite direction and on which an external force acts on the outer periphery; the outer periphery of the extension. a bearing is provided between the surface and the inner peripheral surface of the large inner diameter region of the bell-shaped casing;
The bearing is provided with a supply hole and a drain hole for lubricating oil; the end of the crosshead extends radially with clearance into the region of the small internal diameter of the bell-shaped casing; the free end of the extension and the bell-shaped casing A packing is provided between the extension and the crosshead to seal off any liquid that may form between the extension and the crosshead; the outer end of the crosshead has a reduced diameter end that fits into the area of reduced internal diameter of the bell-shaped casing. This is achieved by configuring the guide portion to fit.

Furthermore, regardless of the structure of the device, the liquid that transfers heat between the hollow roll and the crosshead can be separated from the bearing lubricant, and the heated liquid between the hollow roll and the crosshead can be separated from the bearing lubricant. There is a gap that prevents heat from being transferred from the heating medium to the lubricant.

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

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

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

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 within a machine stand or the like, it is structurally important that the outer diameter of the outer bearing is smaller than the outer diameter of the hollow roll.

A tapered extension attached to the end of the hollow roll
It is known from European Patent Publication No. 43119. The bearing is
It is mounted on the outer surface of this extension and supported within a bell-shaped casing. The difference with the present invention is that the bell-shaped casing is outside the bearing and is not supported in axial alignment at the cylindrical end of the crosshead extending into the bearing. , which in turn surrounds a hollow support member which extends into the interior of the extension towards the hollow roll, in which the ends of the crossheads are
It is held in place by bearings that allow for misalignment when the crosshead is bent. 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 to the crosshead and further in the direction of the bearing,
Preferably, the conduit is provided insulated within the crosshead.

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 section on which the load is applied due to bending of the crosshead inside the hollow roll, the misalignment can be adjusted by sliding ring packing. It is.

The heat medium that reaches the slide ring packing is
Under the influence of oxygen in the air, there is a tendency for gelatinization on the sliding surface, but if this continues for a long time, it will impair the sealing effect. To prevent this, the sliding surface is preferably in an inert gas atmosphere. For example, nitrogen can be considered as the inert gas.

In order to prevent liquids having a significant temperature from flowing too strongly into the gap between the extension and the crosshead, a sealing ring is preferably provided. This sealing ring is, as it were, a rough packing, and a large part 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 the gap between the extension and the crosshead near the sealing ring that holds back most of the liquid is small, a considerable amount of heat is released from the incoming liquid to the surrounding components. Never.

In the case of floating rolls, a heated pressurized heat medium flows through the pressure chamber in the longitudinal direction. At the end opposite the inlet, the liquid flows into a leak chamber opposite the pressure chamber, where it flows back. This is because the liquid is sucked into the pressure chamber opposite the inlet. Thus, the liquid flows in opposite directions to equalize the temperature. There is usually no end cross packing on the side of the leak chamber. In this case, a sealing ring is used to prevent the flowing still hot exudate from being admitted into the leaking chamber.

[Example] Hereinafter, the present invention will be described based on an example with reference to the drawings.

The roll 10 has a fixed crosshead 1 in the form of a substantially solid cylindrical carrier. A hollow roll 2 rotates around this crosshead 1. A space is provided between the inner circumferential surface 3 of the hollow roll 2 and the outer circumferential 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
It is divided into two longitudinal chambers 5, 6, the former being a pressure chamber and the latter a leak chamber. or,
The former is formed on the side of the roll gap 7, that is, the side of the counter roll 8, while the latter is formed on the opposite side of the former. The cylindrical gap is bounded by longitudinal packings 9.
This longitudinal packing 9 is installed on the crosshead 1 and is in liquid-tight contact with the inner circumferential 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. . In the drawing, only the front part of the longitudinal packing 9 is shown. each longitudinal chamber 5,
6 has a shape almost like a cylinder divided vertically evenly. The longitudinal chamber 5 (pressure chamber) is closed at both ends by end cross packings 11. The end crosspacking 11 has the shape of a half ring in the exemplary embodiment and extends into the upper half of the crosshead 1. The outer peripheral surface of the end cross packing 11 is in contact with the inner peripheral surface 3 of the hollow roll 2. The end cross packing 11 extends to the guide pin 12. The guide pin 12 extends perpendicularly to the axis of the crosshead 1 in a plane of action, which is the plane in which the resultant forces exerted by the hydraulic fluid in the longitudinal chamber 5 act. 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 crosspacking 11 has a substantially rectangular cross section, one side of which is connected to the step 1 of the crosshead 1.
3, and the other side of the retaining ring 15 is fixed to the crosshead 1 by a guide pin 12.
It is in contact with 4.

The longitudinal packings 9 placed on both sides of the crosshead 1 together with the end cross packings 11 placed on both ends of the hollow roll 2 form a closed pressure chamber 5 . An insulated conduit 1 extending to an inlet 17 formed on the upper side of the crosshead 1
Via 6, the pressure chamber 5 can be supplied with a pressurizing and heating medium. The pressurized/heating 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 pressurized/heating 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 leakage chamber 6 has an end cross packing. But then the pressure in the leak chamber 6 is lower than that in the pressure chamber. In order to apply a line pressure to the roll gap 7, the pressure difference in the two longitudinal chambers 5, 6 is important.

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 through the vicinity of the outlet 18 and into the stage 13 of the crosshead 1.
Go beyond. A sealing ring 19 is provided so that most of the pressurizing and heating medium remains within the leakage chamber 6. The sealing ring 19 directs the flowing liquid back into the leak chamber 6 where it is directed to the outlet 188.

Not for floating rolls, e.g.
In the case of a roll with a series of pressure elements acting on the inner circumferential surface 3 of the hollow roll 2, a fluid-tightly sealed longitudinal chamber (pressure chamber) 5 is not required. That is, neither the longitudinal packing 9 nor the end cross packing 11 may be dispensed with. 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 and 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 smaller than the outer diameter of the hollow roll 2. Extension part 2
The inner circumferential surface 21 of the crosshead 1 is spaced apart from the outer circumferential surface 22 of the small diameter part of the crosshead 1 projecting from the hollow roll 2 by a small gap 24 . A small amount of the pressurized/heating medium flows from the leak chamber 6 into the gap 24 because
This is the case when it gets over the return ring 19. However, in gap 24 no significant flow occurs.
This is because the left end of the gap 24 is closed by the slide ring packing 25 in the drawing. Slide ring packing 25
has a slide ring 26 whose inner circumferential surface is spaced apart from the outer circumferential surface of the crosshead 1, a counter ring 27 connected to the end surface of the extension 20, and a guide ring 28. Guide ring 28
holds the slide ring 26 in an appropriate position,
It is sealed by a metal bellows 29. The metal bellows 29 is fluid-tightly connected to the guide ring 28 at one axial end, and connected to the retaining ring 31 at the other axial end. This retaining ring 31
is secured within a cylindrical recess 32 of the bell-shaped casing, generally indicated at 30. The bell-shaped casing 30 is in the exemplary embodiment 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 in the latter the cylindrical inner circumferential surface 35 fits into the cylindrical end 1' of the crosshead 1 without any play. has been done. The support portion 36 is formed by this arrangement. This support part 36 is
Even if the bell-shaped casing 30 is loaded radially outside the region 34, alignment between the axis of the crosshead 1 and the axis of the bell-shaped casing 30 is maintained. 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; A hollow roll 2 is rotatably supported on the 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 bends accordingly, but the hollow roll 2 does not bend. This is because the bell-shaped casing 30 is firmly in contact with the crosshead 1 through the support portion 36, so both bend, but since the bearing 40 is a self-aligning bearing, the outer peripheral surface 23 of the extension portion 20 and This is because even if misalignment occurs with the inner circumferential surface 37 of the bell-shaped casing 30, it can be adjusted.

The external force is applied in the region 34 of the bell-shaped casing 30;
It is applied to the end 1' of the crosshead 1 projecting from the hollow roll 2, more particularly via a self-aligning bearing 39. This self-aligning bearing 39 is disposed on the outer peripheral surface 38 of the bell-shaped casing 30, but unlike the self-aligning bearing 40, it is not a rotating type, but similar to the bell-shaped casing 30 and the crosshead 1. It has stopped. Bell-shaped casing 3
The diameter of the outer circumferential surface 38 of the region 34 of
Since the diameter of the self-aligning bearing 39 is smaller than the diameter of the hollow roll 2, the outer diameter of the self-aligning bearing 39 can also be made smaller than the outer diameter of the hollow roll 2. This is desirable for structural reasons.

According to the structure shown, the longitudinal chamber 5,
It is possible to completely separate the pressurization/heat medium circulation at 6 and the lubrication system for the bearing 40. Even if the pressurized/heating medium may flow into the gap 24, it is only up to the slide ring packing 25. The lubricating oil for the bearing 40 is the slide ring packing 2.
Together with the minimum amount of liquid that overflowed into the slide ring packing 25 from the gap 24 flowing out at step 5, the supply hole 41 is supplied from above, and is discharged downwardly through the discharge hole 46 without creating pressure, that is, without stagnation. It gets sucked in. 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 serves to prevent heat transfer.

Sliding surface 2 of slide ring packing 25
5' is annularly surrounded by a chamber 42'. Nitrogen is supplied to the chamber 42' from a supply section 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 manner, ie by means of a chain wheel 43 at the end of the hollow roll 2 and a chain wrapped around it.

The support part 36 supports the bell-shaped casing 30 and the bearing 4
It is necessary to have a constant value that can sufficiently support the bell-shaped casing 30 even if a force that causes the bell-shaped casing 30 to be tilted by 0 is applied. The dimensions of the guide portion 36 are determined from the end of the cylindrical inner peripheral surface 35 of the bell-shaped casing 30 on the hollow roll 2 side to the bearing 40.
It is approximately equal to the distance 44 from this center to the center of the hollow roll 2, and also approximately equal to the distance 45 from this center to the end of the hollow roll 2. In this way, the necessary distance is maintained between the hot area in the region of the longitudinal chambers 5, 6 and the bearing 40. The gap 24 between the extension 20 and the end of the crosshead 1 has a constant length, so that the pressurized and heating medium still flowing in stops in this gap 24 and there is no longer any flow of medium or heat in the area of the bearing 40. Almost no movement occurs.

[Brief explanation of drawings]

The drawing is a partial vertical sectional view of the left end of the roll of the present invention. 1...Crosshead, 1'...End, 2...Hollow roll, 3...Inner peripheral surface, 4...Outer peripheral surface, 5...Pressure chamber, 6...Leak chamber, 7...Roll gap, 8
...Counter roll, 9...Vertical packing, 10
...Roll, 11...End cross packing, 12
...Guide pin, 13...Step, 14...Side surface, 15...Retaining ring, 16...Insulated conduit, 16'...Cross-sectional member,
17...Inlet, 18...Outlet, 19...Return ring, 2
0... Extension part, 21... Inner peripheral surface, 22... Outer peripheral surface, 23
...Outer peripheral surface, 24...Gap, 25...Slide ring packing, 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
...A region with a large inner diameter, 34...A region with a small inner diameter and an outer diameter, 35...Inner circumferential surface, 36...Support part, 37...Inner circumferential surface, 38...Outer circumferential 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 actuating roll arranged in parallel with a counter roll with a roll gap placed therein, and an end portion passing through the inner circumferential surface of the hollow roll in the axial direction and on which an external force acts. a fixed crosshead having a fixed crosshead, a hydraulic device disposed on the crosshead to support the hollow roll, and a hydraulic device disposed at each end of the hollow roll to rotatably support the crosshead relative to the hollow roll and to allow lubricant to flow through the crosshead. In the roll provided with a bearing for holding the roll, the hollow roll 2 is provided with an extension 20 whose outer diameter becomes smaller as it moves away in the axial direction; a region 33 with a large inner diameter that fits into the extension 20;
and a bell-shaped casing 30 which extends from the opposite end of the hollow roll 2 in the axial direction in the opposite direction and has a small inner diameter on the outer periphery of which an external force acts; 23 and the inner peripheral surface 37 of the large inner diameter region 33 of the bell-shaped casing 30; a bearing 40 is provided with a lubricating oil supply hole 41 and a discharge hole 46.
the end of the crosshead 1 extends with a radial clearance to the area of small internal diameter 34 of the bell-shaped casing 30; the free end of the extension 20 and the bell-shaped casing 3;
0, a packing 25 is provided between the extension part 20 and the crosshead 1 to seal the liquid generated between the extension part 20 and the crosshead 1; A roll characterized in that the support portion 36 is formed into a support portion 36 that fits snugly into the small inner diameter region 34 of the bell-shaped casing 30. 2. The supporting portion 36 is connected to the small inner diameter area 3.
4. The roll according to claim 1, wherein the roll is formed to have a length equal to the distance between the end of the hollow roll 4 on the side of the hollow roll 2 and the center of the bearing 40. 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, and the pressure chamber 5 is pressurized within the crosshead 1. - The roll according to claim 1 or 2, characterized in that a heat insulating conduit 16 for guiding the heat medium is provided. 4. The roll according to any one of claims 1 to 3, wherein the packing 25 is slide packing. 5. The packing 25 has a sliding surface 25',
5. The roll according to claim 4, further comprising an inert gas supply section 42 so that the sliding surface 25' comes into contact with an inert gas atmosphere. 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 Items 1 to 5.