CN106917818A - A kind of milling train adjustable hydrodynamic sliding bearing of width - Google Patents

Abstract

The invention discloses a kind of milling train adjustable hydrodynamic sliding bearing of width,Each dissection type hydrodynamic sliding bearing is socketed on axle journal successively vertically,Each dissection type hydrodynamic sliding bearing includes upper tile fragment,Upper shell,Lower tile fragment,Lower house,First voussoir and the second voussoir,Wherein,Upper tile fragment is fastened on the upper surface of axle journal,Lower tile fragment is fastened on the lower surface of axle journal,There is gap between axle journal and upper tile fragment and lower tile fragment,Upper shell is fastened and is fixed on the outer wall of tile fragment,Lower house is fastened and is fixed on the outer wall of lower tile fragment,And upper tile fragment is just to lower tile fragment,Upper shell is just to lower house,There is annular gap between upper shell and lower house,First voussoir is inserted in the side of the annular gap,Second voussoir is inserted in the opposite side of the annular gap,Gap between spill port and axle journal and upper tile fragment is connected,The width-diameter ratio of the bearing is adjustable.

Description

A width-adjustable dynamic pressure sliding bearing for a rolling mill

technical field

The invention belongs to the field of metallurgical steel rolling machinery and relates to a width-adjustable dynamic pressure sliding bearing for rolling mills.

Background technique

Rolling mill is one of the important equipment for wire or plate production. Its main features are large, high-speed, heavy-duty, continuous, and automatic. Most modern large-scale rolling mills use oil film bearings, which are called work roll bearings or back-up roll bearings on rolling mills. Rolling mill oil film bearings, due to changes in working conditions, the working range of this type of bearing is very wide, covering multiple lubrication states such as low-speed heavy load, medium-speed medium load, high-speed heavy load, and high-speed light load. Traditional sliding bearings are often Designing for one or several lubrication states cannot meet the wide range of changes in the working state of the rolling mill. Under low-speed and heavy-load conditions, the bearing is required to have a higher bearing capacity, and a large width-to-diameter ratio is conducive to bearing high rolling force. At this time, the bearing's width-to-diameter ratio should be as large as possible; under high-speed and light-load conditions, oil film bearings The bearing capacity can meet the requirements, but it should be ensured that the bearing has a good heat dissipation capacity, and the width-to-diameter ratio is small, which is conducive to improving the operation stability and increasing the end leakage to reduce the temperature rise. At this time, the bearing's width-to-diameter ratio should be as small as possible; The design of the bearings under such two working conditions is contradictory. A bearing with a specific width-to-diameter ratio cannot meet the requirements of different working conditions at the same time. It can be in an ideal working state under working conditions, which will greatly reduce bearing wear, improve the service life and production efficiency of bearings, and reduce production costs. The working characteristics of the rolling mill: (1) The load of the rolling mill is heavy, but the diameter of the roll and the size of the bearing are limited by the size of the roll, and cannot be increased without limit. Therefore, the unit pressure on the roll bearing is large, which is 2 to 10 times higher than that of general-purpose bearings. (2) High speed is the development trend of modern rolling mills, so the working speed range of roll bearings is changing more and more; (3) The working environment is harsh, uneven heating, and temperature instability; (4) Frequent roll changes; (5) Sheet metal High precision is required. According to the working characteristics of the rolling mill, higher requirements are put forward for the roll bearings: high bearing capacity, high rotation accuracy, high limit speed, simple structure, easy assembly and disassembly, etc. are required. Therefore, according to the working requirements and actual conditions of the rolling mill, the design and selection of rolling mill roll bearings is very important, which is related to the performance of the rolling mill.

Oil film bearings for rolling mills are mainly composed of taper sleeves, bushes, thrust bearings, sealing systems, locking systems and other parts. Oil film bearings have many characteristics: large load capacity, strong impact resistance; long service life; wide speed range; small structure size; low friction coefficient. Rolling mill oil film bearings are vulnerable parts. The oil film thickness of the bearing is generally only 0.0020-0.030mm. An oil film bearing with specific parameters cannot meet the working conditions of the rolling mill when rolling wires with different diameters. When the working conditions change, If the parameters of the oil film bearing cannot be changed in real time according to the requirements, the bearing will quickly wear out severely, and even cause serious accidents. Therefore, it is of great significance and value to change the bearing parameters so that it can adapt to the change of working conditions to improve the service life and production efficiency of the rolling mill.

The working speed of the rolling mill changes from hundreds to tens of thousands of revolutions, and the rolling force also changes significantly. Different working conditions have very different requirements for oil film bearings. By changing the width-to-diameter ratio of the bearing, the bearing can be adjusted The oil film thickness, bearing capacity, power consumption, temperature rise, etc. of the bearing can be obviously adjusted, and then can meet the working requirements of the rolling mill to a large extent, but there is no bearing with an adjustable width-to-diameter ratio in the prior art.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the above-mentioned prior art, and provide a dynamic pressure sliding bearing with adjustable width for rolling mills, the width-to-diameter ratio of the bearing is adjustable.

In order to achieve the above purpose, the width-adjustable dynamic pressure sliding bearing for a rolling mill according to the present invention includes a controller, a motor, a journal and several split type dynamic pressure sliding bearings;

Each split dynamic pressure sliding bearing is sequentially sleeved on the journal along the axial direction. Each split dynamic pressure sliding bearing includes an upper pad, an upper shell, a lower pad, a lower shell, a first wedge and The second wedge, wherein the upper pad is fastened on the upper surface of the journal, the lower pad is fastened on the lower surface of the journal, there is a gap between the journal and the upper pad and the lower pad, and the upper The casing is buckled and fixed on the outer wall of the upper tile, the lower casing is buckled and fixed on the outer wall of the lower tile, and the upper tile is facing the lower tile, the upper casing is facing the lower casing, and the upper casing and There is an annular gap between the lower shells, the first wedge is inserted into one side of the annular gap, the second wedge is inserted into the other side of the annular gap, the lower shell is provided with an oil wedge and a supply The oil hole, the oil supply hole and the gap between the journal and the lower pad are connected, the upper shell is provided with an oil return hole, the oil return hole is connected with the gap between the journal and the upper pad, and the controller passes through The motor drives the first wedge and the second wedge to extend or extend into the annular gap.

It also includes first locking bolts and several first bearing seats, wherein one first bearing seat corresponds to one lower shell, the first bearing seat is connected with the lower shell, and the first locking bolts pass through each first bearing seat Connect each first bearing seat.

It also includes a second locking bolt and a plurality of second bearing seats, wherein one second bearing seat corresponds to an upper shell, the second bearing seat is connected with the upper shell, and the second locking bolt passes through each second bearing seat Connect each second bearing housing.

The number of split dynamic pressure sliding bearings is greater than or equal to three.

The width-to-diameter ratio of each split dynamic pressure sliding bearing is less than 0.3.

The width-to-diameter ratio of each split dynamic pressure sliding bearing is 0.2.

The present invention has the following beneficial effects:

During specific operation of the width-adjustable dynamic pressure sliding bearing for a rolling mill according to the present invention, the controller adjusts the movement direction of the first wedge and the second wedge through the motor, thereby adjusting the distance between the journal and the upper pad and the lower pad. The size of the gap, and then control the working state of each split dynamic pressure sliding bearing. In actual operation, the adjustment of the width-to-diameter ratio of the entire bearing is realized by adjusting the working state of each split dynamic pressure sliding bearing. Specifically, when the first wedge and the second wedge are far away from the journal, the gap between the journal and the upper and lower pads is reduced, and a dynamic pressure oil film is formed between the journal and the upper and lower pads , the split dynamic pressure sliding bearing is in working condition; when the first wedge and the second wedge are close to the journal, the gap between the journal and the upper pad and the lower pad increases, and the journal and the upper pad No dynamic pressure oil film is formed between the upper and lower pads, the split dynamic pressure sliding bearing is in a non-working state, the operation is convenient, the structure is simple, and it can meet the working needs of the rolling mill to a greater extent.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a sectional view of the present invention;

Fig. 3 is a schematic structural view of the first bearing seat 9 in the present invention;

FIG. 4 is a schematic structural diagram of the oil supply hole 12 in the present invention.

Among them, 1 is the split dynamic pressure sliding bearing, 2 is the upper pad, 3 is the lower pad, 4 is the upper shell, 5 is the journal, 6 is the lower shell, 7 is the first wedge, 8 is The first locking bolt, 9 is the first bearing seat, 10 is the second wedge, 11 is the oil wedge, and 12 is the oil supply hole.

detailed description

The present invention is described in further detail below in conjunction with accompanying drawing:

Referring to Fig. 1, the width-adjustable dynamic pressure sliding bearing for a rolling mill according to the present invention includes a controller, a motor, a journal 5 and several split dynamic pressure sliding bearings 1; Sleeved on the journal 5, each split dynamic pressure sliding bearing 1 includes an upper pad 2, an upper shell 4, a lower pad 3, a lower shell 6, a first wedge 7 and a second wedge 10 , wherein the upper tile 2 is fastened on the upper surface of the journal 5, the lower tile 3 is fastened on the lower surface of the journal 5, and there are gaps between the journal 5 and the upper tile 2 and the lower tile 3. The upper shell 4 is buckled and fixed on the outer wall of the upper tile 2, the lower shell 6 is buckled and fixed on the outer wall of the lower tile 3, and the upper tile 2 is facing the lower tile 3, and the upper shell 4 Facing the lower shell 6, there is an annular gap between the upper shell 4 and the lower shell 6, the first wedge 7 is inserted into one side of the annular gap, and the second wedge 10 is inserted into the side of the annular gap. On the other side, the lower housing 6 is provided with an oil wedge 11 and an oil supply hole 12, the oil supply hole 12 communicates with the gap between the journal 5 and the lower pad 3, and the upper housing 4 is provided with an oil return valve. The hole, the oil return hole and the gap between the journal 5 and the upper pad 2 are connected, and the controller drives the first wedge 7 and the second wedge 10 to stretch out or stretch into the annular gap through the motor.

The present invention also includes first locking bolts 8 and several first bearing seats 9, wherein one first bearing seat 9 corresponds to one lower casing 6, the first bearing seat 9 is connected with the lower casing 6, and the first locking Bolts 8 pass through each first bearing seat 9 to connect each first bearing seat 9; the present invention also includes second locking bolts and several second bearing seats, wherein one second bearing seat corresponds to one upper shell 4, The second bearing seat is connected with the upper casing 4, and the second locking bolt passes through each second bearing seat to connect each second bearing seat.

The number of split dynamic pressure sliding bearings 1 is greater than or equal to 3; the width-to-diameter ratios of each split type dynamic pressure sliding bearings 1 are all less than 0.3.

Concrete operation of the present invention is:

By changing the position of the first wedge 7 and the second wedge 10 in the annular gap, the gap size between the journal 5 and the upper shoe 2 and the lower shoe 3 can be changed accordingly. When the two first wedges 7 and the second wedge 10 close to the journal 5, the upper tile 2 and the lower tile 3 are squeezed and bounced off, and the gap between the journal 5 and the upper tile 2 and the lower tile 3 becomes larger, and cannot form The dynamic pressure oil film, the split dynamic pressure sliding bearing 1 is in the non-working state; The gap becomes smaller, a dynamic pressure oil film is generated, and the split type dynamic pressure sliding bearing 1 starts to work. In actual operation, the controller drives the first wedge 7 and the second wedge 10 to move through the motor. At the same time, the purpose of adjusting the width-to-diameter ratio of the entire bearing is realized by changing the working state of each split dynamic pressure sliding bearing 1 .

When the width-to-diameter ratio of a single split dynamic pressure sliding bearing 1 is 0.2, and the whole bearing is composed of six split dynamic pressure sliding bearings 1, the split dynamic pressure sliding bearing 1 in the working state is adjusted sequentially to make The number of bearings is 1 to 6, which can realize six different working states of the entire bearing with a width-to-diameter ratio of 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2.

Claims (6)

1. a kind of milling train adjustable hydrodynamic sliding bearing of width, it is characterised in that including controller, motor, axle journal (5) and some Dissection type hydrodynamic sliding bearing (1)；

Each dissection type hydrodynamic sliding bearing (1) is socketed on axle journal (5) successively vertically, each dissection type hydrodynamic sliding bearing (1) Include upper tile fragment (2), upper shell (4), lower tile fragment (3), lower house (6), the first voussoir (7) and the second voussoir (10), wherein, Upper tile fragment (2) is fastened on the upper surface of axle journal (5), and lower tile fragment (3) is fastened on the lower surface of axle journal (5), axle journal (5) with it is upper There is gap between tile fragment (2) and lower tile fragment (3), upper shell (4) is fastened and is fixed on the outer wall of tile fragment (2), lower house (6) fasten and be fixed on the outer wall of lower tile fragment (3), and upper tile fragment (2), just to lower tile fragment (3), upper shell (4) is just to lower house (6), there is annular gap between upper shell (4) and lower house (6), the first voussoir (7) is inserted in the side of the annular gap, Second voussoir (10) is inserted in the opposite side of the annular gap, and lower house (6) is provided with oil film wedge (11) and oil supplying hole (12), Gap between oil supplying hole (12) and axle journal (5) and lower tile fragment (3) is connected, and upper shell (4) is provided with spill port, spill port and Gap between axle journal (5) and upper tile fragment (2) is connected, and controller drives first wedge block (7) and the second voussoir by motor (10) stretch out or stretch into annular gap.

2. the milling train according to claim 1 adjustable hydrodynamic sliding bearing of width, it is characterised in that also including the first locking Bolt (8) and some first bearing seats (9), wherein, first bearing seat (9) one lower house (6) of correspondence, first bearing seat (9) it is connected with lower house (6), be connected for each first bearing seat (9) through each first bearing seat (9) by the first clamping screw (8) Connect.

3. the milling train according to claim 2 adjustable hydrodynamic sliding bearing of width, it is characterised in that also including the second locking Bolt and some second bearing seats, wherein, a second bearing seat corresponds to a upper shell (4), second bearing seat and upper shell (4) it is connected, be connected for each second bearing seat through each second bearing seat by the second clamping screw.

4. the milling train according to claim 1 adjustable hydrodynamic sliding bearing of width, it is characterised in that dissection type dynamic pressure is slided The number of bearing (1) is more than or equal to 3.

5. the milling train according to claim 1 adjustable hydrodynamic sliding bearing of width, it is characterised in that each dissection type dynamic pressure is slided The width-diameter ratio of dynamic bearing (1) is respectively less than 0.3.

6. the milling train according to claim 5 adjustable hydrodynamic sliding bearing of width, it is characterised in that each dissection type dynamic pressure is slided The width-diameter ratio of dynamic bearing (1) is 0.2.