CS200569B1 - Seating device of the working cylinder of the rolling moll stand - Google Patents

Description

(54) work roll storage devices at rolling mill stand

The invention relates to the field of construction of rolling mill machines, and more particularly to the rolling mill bearing apparatus of a rolling mill mill.

The working roll storage devices of the mill mill mill are known.

The prototype is a storage device according to German Patent Specification No. 218 524 *.

This device has a rigid beam, which is located in a stand under the adjusting spindles, further a cylinder and bearings arranged at the end, a hydrostatic bearing on which the supporting cylinder is supported and which comprises a pan with pockets for storing oil (liquid medium) leather hydraulic adjusting roller with working spaces, which are arranged in a distance forest between the beam and hydrostatic bearing.

During the rolling process, due to the uneven heating of the billet, the uneven thickness, the inconsistency of its mechanical properties, among other things, increases the curing force, resulting in increased stool deformation, roll deflection and a change in the thickness of the material to be cured. In order to maintain a predetermined thickness of the rolled material, the oil pressure in the hydraulic adjusting rollers can be varied.

However, the known device has the disadvantage that it is not possible to automatically regulate the profile of the rolled material during the rolling pole by means of the compensating bend of the roll. There are also known bearings for working roll bearings which reduce the difference in thickness of the material to be traversed in the transverse direction and have support rollers with bearings arranged therein,

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200 569 between whose extended studs are located adjusting devices which produce an additional force that bends the rolls on the side that is opposite to the deflection arising from the force of the rolling force. These known devices are provided with an automatic system for controlling the thickness of the rolled material. which has measuring instruments, converters and amplifiers, memory devices and the like

The automatic adjustment of the leveling bend force of these known devices is based on measuring the thickness of the rolled material by the measuring apparatus, transforming the measurement results into an electrical signal that controls the leveling bending system control apparatus.

The automatic control system for the rolled material profile in these devices must be provided by reliable measuring and control instruments, which proves difficult in practice and, in addition, a long chain of deformation results when measuring the thickness of the rolled material o on the execution pulse causes the inertia of the system.

In addition, the well-known automatic thickness control syntheses are very complex and expensive.

Further, there is known a bearing arrangement of a rolling mill roller bearing having a rigid beam located in a stand below the adjusting spindles, a supporting roller with bearings arranged on the hinges on which a sleeve of a hydrostatic bearing with the shape of a bearing is arranged. semicircle with stiffness, varying in cross-section and its inner surface forming a gap with the body of the supporting roll, and further have a mechanism for adjustable gap control ·

The mechanism for regulating the gap is designed in the form of spindles, which are arranged in the bush of the hydrostatic bearing on the sides of the ladle in its loaded area and act on the ladle via wedges ·

The gap adjustment mechanism is in the form of wedges located between the hydrostatic bearing housing and the bearing edges.

The existence of the above-mentioned special profile mechanisms and ladles allows the bearing mechanism to be carried out on the rollers. that matches the body profile of the rolled roll ·

To increase the pelvis stiffness and reduce its defomaoe under hydrostatic pressure, the spindle mechanism increases the gap control mechanism, the number of pelvic strokes and the hydrostatic bearing bush *

However, this device has a number of drawbacks ·

Adjusting and maintaining the gap required during the roll between the pan and the roll is complicated and labor intensive, especially in large storage facilities.

This working process must also be carried out when the hydrostatic bearing is loaded. otherwise it is difficult to guarantee the required gap between the pan and the roll ·

It is necessary to have a spelar device for loading the hydrostatic bearing outside the stand or to adjust the gap in the stand when loaded with rollers. · The pressure of the pelvis on the edges must be of a type that provides a certain gap between the roll and the pelvis.

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The large gap does not allow the necessary pressure to be maintained, while the lack of a sufficient gap creates conditions for the metal contact of the edges of the pelvis with the body of the body not being in this gap area the entire oil pressure.

Furthermore, it is not possible to automatically regulate the profile of the rolled material in response to a change in the rolling force, nor is it possible to control the pan pressure on the cylinder body, which is one of the most important conditions for the hydrostatic bearing operation.

If the pan is pressed by an extremely high force through the control mechanism, the space between the pan and the hydrostatic bearing housing is created. However, when the downforce is applied with insufficient force, the gap between the ladle and the cylinder body increases. The latter leads to a reduction in bearing capacity and a reduction in bearing stiffness.

It is an object of the present invention to overcome these drawbacks.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a support device for the mill stand of a rolling mill mill which, while maintaining a simple prototype construction, enables the thickness of the rolled material to be controlled automatically and reliably.

It is proposed to provide a work roll storage device for a mill of a rolling mill which is located in the hole of the stand stands and in the guide windows that the adjusting spindles engage and has support rolls arranged in the stand hole with ends mounted in the horizontal windows of the stands on a hydrostatic bearing with a sheath is located in its housing, which forms a gap on its inner surface with the support cylinder body and has at least one pocket on this inner surface which is connected via a hydraulic line to a pressurized liquid medium The hydraulic cylinders are mounted between the beam and the bearing and are supported along the length of the cylinder and act on the bearing bush during the rolling process to regulate the profile of the rolled material. SUMMARY OF THE INVENTION The present invention is characterized in that the receiving device has at least one pocket, the pockets and their corresponding hydraulic cylinders being connected by a single source of pressurized liquid medium and connected to the source by means of a hydraulic duct equipped with a flap.

The present invention has provided a working device for the rolling mill stand, which, while maintaining the simplicity of the prototype construction, enables and reliably controls the thickness of the rolled material.

The device according to the invention also makes it possible to roll wide plates with a high quality in thickness.

Conveniently, a shut-off valve with a control space is provided parallel to the flap, which is connected by a conduit between the pocket and the flap, thereby enabling a predetermined opening of the working rolls to be secured when the material to be weighed is discharged therefrom.

It is also expedient, when working with rotated cylinders, to provide the bearing device with a mechanism for regulating the gap between the inner surface of the ladle and the cylinder body during a rolling process comprising hydraulic cylinders arranged in the bearing housing in such a way that a pelvis, formed as a semicircle β rigidity, varying in cross-section, in its loaded area, while the working space of one of these hydraulic cylinders is connected by a hydraulic conduit through the pelvis pocket and by gluten.

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This technical solution allows the gap between the pan and the body to be maintained at a low level and that the extent of the damper control during the operation of the storage device and the rollers is reduced.

Furthermore, to adjust the gap between the inner surface of the shell and the body of the cylinder, the bearing arrangement has a gap control mechanism in the setting having hydraulic cylinders arranged in the bearing housing so that their pistons cooperate with the edges of the shell These hydraulic cylinders are provided with non-return valves, having movable plungers with channels for supplying liquid medium to the hydraulic cylinders and for shifting the edges of the ladle by a certain amount caused by these hydraulic cylinders, which ensures the necessary gap between the ladle and the body.

This type of fire-proof solution allows to adjust the output gap between the roll and the pan with the necessary premature, which also allows to reduce the regulation range of the flap during the operation of the device β by roll-over rolls *

In the following, the invention will be explained in the description of an exemplary embodiment and in the drawing, where "

FIG. 1 shows a workstation stand of the billet with the side of the billet outlet into the cylinders with the cross-sectional view of the cylindrical bearings of the invention.

Fig. II - II Fig. 1

FIG. 3 is a cross-sectional view of FIG. 1 in an embodiment of a half-circle bearing arrangement having a stiffness varying in cross-section;

Fig. 4 enlarged detail ”A * 'from Fig. 3 ·

Figures 1 and 2 show a work bench of a rolling mill and a rolling roll storage device according to the invention mounted thereon.

In the opening of the stand 1 of the rolling stand are provided cylindrical bearings ²⁸ , located on the bearing, which are located in the guide windows 2 of the stand 1 for fixing the supporting rolls 2 ^{in the} axial direction.

Between the support rollers 2 s® there are work rollers 6 which are in contact with the south and which are pressed against the support rollers 2 by means of compensating devices 2.

Hydrostatic bearings 2, ^{8 with} bearing shells 10, adjoin the support roll 2 with their shells 8, which form a gap 12 with the bodies 11 of the support roll 2 with their inner surfaces and have pockets 12 arranged in pairs for oil treatment over the length. according to the condition of not separately setting the supporting roll 2 ^{in the} ladle 10.

Beams 14 are mounted in the gap of the stands 1, which are pressed against their support rollers onto the supporting roll 2 by means of the adjusting spindles 12 which are located in the guide windows of the stands 1.

Between the beams ϋ ^{and the} bushes 8 of the hydrostatic bearings 2 a hydraulic adjusting roll 16 is provided over the longitudinal length of the support roll 2, which during the rolling operation acts on the bearing bush 8 of the bearing 2 to regulate the profile of the rolling material. The hydraulic cylinders 16 are opposed to each pair of pockets 12. The working space 16 of each hydraulic cylinder 16 and its corresponding pockets 12 are connected via a hydraulic pipe 16 in conjunction with

200 569 by a single source 20 of pressurized liquid medium with which the pockets 13 are connected by a hydraulic line 21 via a flap 22.

A pressurized liquid medium source 20, for example, in the form of a pumping device with adjustable delivery capacity, pressurizes the oil under pressure into the pockets 13 and the hydraulic cylinders 16 through a hydraulic subcube 19 in which pressure 23 is maintained by the regulators 23.

In order to secure a predetermined opening of the working rolls 6 at the moment of the output of the material to be rolled 17, a shut-off valve 26 is connected in parallel to the flap 22 on the hydraulic line 25, the control space 27 is connected to the supplying hydraulic line 21 between the flap 22 and the pocket 13 28.

Shut-off valve 26 has a piston 29 and a spring 30 (or other source of constant force, for example electromagnets) * _y

FIGS. 3 and 4 show a variation of an embodiment of a storage device in which the ladle is formed in a semicircle shape with stiffness varying in cross-section and provided with a mechanism 31 to control the gap 12 between the inner surface of the ladle 10 and the roll body 2 during the rolling process as well as the gap adjustment mechanism 35 before the rolling starts.

The gap control mechanism 31 is in the form of hydraulic cylinders 32, which are housed in the bearing housing 8a of the bearing 9a. The movable member of each hydraulic cylinder 22 acts on the bearing shell 10a in its loaded area approximately 30 ° to the vertical. The working space 34 of each hydraulic cylinder 32 is connected by a hydraulic line 21 between the pocket 13 of the pan 10a and the flap 22.

The gap-adjusting mechanism 35 has hydraulic cylinders 36 which are located in the bearing housing 8a so that their pistons 37 cooperate with the edges of the ladle 10a. On the side of the working space 3β of these hydraulic cylinders 36 there are check valves 39 having movable plungers 40 with channels 41 for supplying oil to the hydraulic cylinders 36 and for shifting the edges of the ladle 10a by a quantity of these hydraulic cylinders which ensures the desired gap 12 between pans 10a and cylinder body 11 ·

The storage device operates in a stationary operating state as follows.

The pumping device 20 generates an outlet pressure in front of the pegulators 23, by means of which the desired pressure is set in each pressure branch of the hydraulic line 19 according to the rolling force controlled by the pressure gauges 24.

The oil which is under pressure, reaches the setting cylinders 16 and generates the force acting on the supporting roll 2 ^and equal to the force of the rolling ·

Dimension ratio of hydraulic cylinders 16. the pockets 13 and the flaps 22 are selected taking into account the condition that in the area of possible change of oil flow through the bearing 2 the fluid friction and rolling force balance, bearing capacity of the lubrication layer in the gap 12 and the force of the hydraulic cylinders 16 are ensured. bearing capacity of the lubricating layer in the gap 12 as the load in hydraulic cylinders 16 increases

During the rolling process, as the rolling force increases, the gap 12 in the hydraulic bearing 2 becomes smaller, as a result of which the oil pressure in the pockets 12 increases. The oil pressure in the pockets 13 increases up to a value equaling the force in hy2006. and the bearing capacity of the lubricating layer. V torní; the system t rolling force - bearing capacity of the lubrication block - the force of the hydraulic cylinders 16 will still be found at equilibrium and therefore the load of bearing 2 will almost never exceed its bearing capacity.

When changing the rolling! Thus, the forces of the hydraulic cylinders 16 change automatically under the effect of the changed oil pressure in the pockets 13.

If it is necessary to correct the force of any of the hydraulic cylinders 16, i.e. to change the distribution of the rolling force over the entire length of the cylinder 2, it is necessary to change the oil flow through the corresponding hydraulic pipes 12. Changing the oil flow through the flap 20 will change the flow resistance by a point. The force of the hydraulic cylinder 16 is varied by a value of < p &gt; oP p, where P is the area of the piston of the hydraulic cylinder 16.

During the roll-off operation, the piston 29 of the valve 26 closes various oil channels 42 in the working space 27 of the shut-off valve 2 under the action of the oil pressure in the pockets 13. As the rolled material 17 exits the rolls 6, the pressure in the pockets 13 and in the working space 27 decreases steeply. The spring 30 adjusts the piston 29 while releasing the oil flow through the channels 42 and guiding the oil on the flap 22 as practically equalizing the pressure in the hydraulic cylinders 16 up to the pressure in a pocket 13 that lies near zero. The rods 43 of the hydraulic cylinders 16 remain in their original position and the gap between the working rolls 6 remains constant.

To perform the roll-roll washing machine 2, the gap control mechanism 31 during the rolling process operates as follows (FIG. 3).

During rolling, oil is fed to the pockets 13 of the pans 10a and the working spaces 34 of the hydraulic cylinders 32, in which the piston faces 44 are selected depending on the predetermined apparatus of the pan 10a.

As the rolling force increases, the lubrication gap 12 between the inner surface of the pan 10a and the body 11 of the cylinder 2 decreases »the resistance to the oil flow through the gap 12 increases and consequently the pressure in the pockets 13 increases. The hydraulic cylinders 32 whose forces prevent deformation of the ladle 10a.

As a result, the gap 12 of the ladles 10a and the body 11 of the roll 2 do not change the position of the roll 2 P 1 as the rolling force increases.

As the rolling force decreases with a constant flow of oil through the gap 12, the pressure in the pockets 13 and the working spaces 34 decreases accordingly, and subsequently the gap 12 does not change just as with increasing force, and the ladle 10a retains its cross-sectional profile. that it remains nailed to the bearing bush 8a of the bearing 9a.

This automatically regulates the ladle profile 10 and depends on the rolling force.

Before roll-over with 2 ^s ® rollers using the 35 mechanism, it sets the original gap 12 *

For this purpose, the hydrostatic bearing 9a is preloaded with a force approximately equal to half the rolling target. Oil is fed to the pockets 13 to provide a hydrostatic separation of the friction surfaces - the inner surface of the pan 10a and the surface of the body 11 of the support cylinder 2. Then oil is fed from the pumping device 39 through the inlet port 45 of the valve 39 (not shown) via valve 46. 40 shifts the lift height H, beyond 5669, by way of the channels 41 connecting the working spaces 38 of the hydraulic cylinders 36 and the inlet channels 45. ? oil pressure in hydraulic cylinders 36, the edges of the pan přitlačujž Loan body 11 of the cylinder 2 in touch with těmito.Síla that develops hydraulic cylinders 36 for applying pressure in the working chamber 38 ^with equalized forces ® elastic deformation of the pelvis IQaa oil pressure in the gap 12. Then the oil flow stops. Valve 46 closes. Opening the valve 48 connects the duct 45 with the outlet 49.

Under the oil pressure in the working space 38, the plunger 40 moves in the opposite direction by a lift height, squeezing out a certain amount of oil from the check valve 22 and closing the oil outlet from the working space 38. As the oil pressure in the working space 38 decreases, the edges of the ladle 10a move the elastic deformation force and the oil pressure in the gap 12 by the pistons 37 of the hydraulic cylinders 36 of size h ”, equal to the gap 12 and corresponding to the specified oil volume. The size of the gap 12 in hydrostatic bearings is usually measured in hundredths of a millimeter.

According to said method, a precise adjustment of the gap 12 between the inner surface of the ladle 10a and the body 11 of the support roll 2 is ensured.

The described gap adjustment operation 12 is carried out periodically before rolling.

Claims (4)

SUBJECT OF THE INVENTION A work roll storage device for a mill of a rolling mill, which is located in an opening of the stand stands and in their guide windows, which reaches the adjusting spindles, and has a support roller arranged in the stand holes, with hinges mounted in the guides of the stand windows. a hydrostatic bearing with a bearing which forms a gap on its inner face with the support cylinder body and has at least one pocket on this inner face which is connected to the source of the pressurized liquid medium by a hydraulic line and a beam which is pressed against hydraulic cylinders mounted along the length of the cylinder and acting on the bearing housing to control the profile of the rolled material during the rolling process, characterized in that on the inner surface of the ladle (10) (10a) hydrost The thrust bearing (9, 9a) has at least one pocket (13) for each hydraulic cylinder (16), the pockets (13) and their corresponding hydraulic cylinders (16) being connected to a single source (20) of pressurized liquid medium. 13) are further connected to the source (20) by means of a hydraulic line (21) provided with a flap (22). Storage device according to claim 1, characterized in that a shut-off valve (26) is arranged in parallel with the flap (22), the operating space of which is connected between the pocket (13) and the flap (22) with the hydraulic line (21). Storage device according to claim 1, characterized in that a gap-regulating mechanism (31) comprising a hydraulic cylinder (32) is arranged between the inner surface of the pan (10a) and the body (11) of the support cylinder (3). which are housed in the bearing housing (9a) and the movable member (33) of each hydraulic cylinder (32) acts on the bearing shell (10a) of the bearing (8a), while the working space (34) of each of these hydraulic cylinders (32) is between 13) the ladle (10a) and the flap (22) connected to the hydraulic pipe (21). 200 569 Storage device according to Claim 3, characterized in that a meohanlemus (35) is provided between the inner surface of the ladle (10a) and the support roll body (11) for adjusting the gap (12) provided with hydraulic rollers (36), which are housed in the bearing housing (8a) and its pistons (37) cooperate with the edges of the shell (10a), and the return spaces (38) of these hydraulic cylinders (36) are provided with return valves (39), having movable plungers (40) and ducts (41) for supplying liquid medium to cylindrical cylinders (36) and for displacement caused by these hydraulic cylinders (36) of pan edges (10a) of size (h);