RU2307715C1 - Rolling stand having hydraulic screw-down mechanism - Google Patents

Abstract

FIELD: equipment for plastic working of materials, namely rolling stand with hydraulic screw-down mechanism.

SUBSTANCE: rolling stand includes housing; rolling rolls with chocks; backup rolls with chocks; hydraulic cavity at each side of stand for lifting upper backup roll and screw-down mechanism hydraulic cylinder; hydraulic control board and pump-accumulation system. Body of hydraulic cylinder is rigidly secured to housing over chock of upper roll and it is common for movable link performing rough adjustment of gap value between rolling rolls and provided with stop joined to said body and for movable link performing fine adjustment of gap value between rolling rolls and joined with chock of upper roll. Common hydraulic control cavity designed for fine adjustment of gap value between rolling rolls is provided between said movable links.

EFFECT: simplified design, lowered mass and size of rolling stand having increased rigidity, simplified maintenance of rolling stand with hydraulic screw-down mechanism.

4 cl, 2 dwg

Description

The invention relates to the field of equipment for metal forming, in particular to rolling stands with a hydraulic pressure device, and can be used to create new and modernize existing rolling mills.

A rolling stand with a hydraulic pressure device is known, comprising a bed, rolls with pillows, on each side of the stand a movable link of the hydraulic cylinder of the press device for coarse adjustment of the gap between the work rolls, a movable link of the hydraulic cylinder of the press device for fine adjustment of the gap between the work rolls and a hydraulic cavity for the implementation of the lifting of the upper roll, hydraulic control panel and a battery-pump installation. Moreover, on each side of the stand, the movable link for coarse adjustment of the gap between the work rolls is included in the hydraulic cylinder mounted on the stand frame above the corresponding cushion of the upper roll, and the movable link for fine adjustment of the gap between the work rolls is included in the hydraulic cylinder mounted on the bed stand under the corresponding cushion of the lower roll [1].

On all sheet, strip and crimping mills, the position of the lower roll with pillows and bearings in the working stand is constant. Therefore, the solution between the rolls is controlled by moving only the upper roll using the pressure mechanism (Zotov V.F. Production of rolled products. - M.: Intermet Engineering, 2000. - P.129-130).

Thus, the considered technical solution, when trying to implement it, in most cases requires a significant change in the design of the mill stand.

The use of two hydraulic cylinders located on different sides of the rolling stand on each side of the rolling stand for rough and precise adjustment of the gap between the work rolls entails an increase in the size and weight of the hydraulic press device and the stand as a whole, complicating the stand design and its maintenance, which is a disadvantage of the known rolling stands with a hydraulic pressure device.

The movement of the movable link for coarse adjustment of the gap between the work rolls is selected taking into account the amount of movement of the upper roll necessary for the change (transshipment) of the rolls. In this regard, the volume of the working fluid located in the hydraulic cylinder of the pressure device for coarse adjustment of the gap between the work rolls, after setting the work rolls in the position necessary for rolling, is large enough.

During the operation of the known stand, the rolling force is perceived both by the working fluid located in the hydraulic cylinder of the pressure device for fine adjustment of the gap between the work rolls, and by the working fluid located in the hydraulic cylinder of the pressure device for coarse adjustment of the size of the gap between the work rolls. It is known that the working fluid, due to its compressibility, changes its volume when the pressure changes to a greater extent than, ceteris paribus, a larger volume of fluid.

In view of the foregoing, the stand under consideration has a reduced stiffness, which is also its significant drawback.

Closest to the claimed technical solution is a rolling stand adopted as a prototype with a hydraulic pressure device, comprising a bed, rolls with pillows, on each side of the stand a movable link of the pressure cylinder of the pressure device for coarse adjustment of the gap between the work rolls, equipped with a stop, a movable link of the pressure cylinder devices for fine adjustment of the gap between the work rolls and a hydraulic cavity for lifting the upper roll, hydropanel Government & pump unit-battery [2].

In order to eliminate the influence of the flexibility of the pressure cylinder of the pressing device for coarse adjustment of the gap between the work rolls (due to the elastic properties of the housing of this hydraulic cylinder and the compressibility of the working fluid enclosed in it) on the rigidity of the stand by closing the power circuit between the movable body of the said hydraulic cylinder and the bed, the specified stand is equipped with mounted bed with stepped spacers associated with the drive of their possible movement in the direction perpendicular to the axis of the hydraulic cylinder core.

These stepped spacers play the role of a stop for the movable link (movable housing) of the hydraulic cylinder for coarse adjustment of the gap between the work rolls.

After the stop of the movable link (movable housing) of the hydraulic cylinder for coarse adjustment of the gap between the work rolls in the stepped spacers, the pressure of the working fluid in the cavity of the hydraulic cylinder in question is increased to a value that ensures that the pressure on the movable link is greater than the rolling force. This pressure force closes on the stand bed through intermediate parts (a cross-member and special stud columns having a length not less than the stroke of the movable housing of the hydraulic cylinder). Thanks to the above, during the rolling process (regardless of fluctuations in the rolling force) the movable housing of the pressure cylinder for coarse adjustment does not change its position relative to the stop (step spacers), and the working fluid enclosed inside this cylinder does not perceive changes in external force and, accordingly, is not deformed . As a result, the hydraulic pressure device and rolling stand generally have increased rigidity.

However, the use of hydraulic cylinders on each side of the rolling stand on two hydraulic cylinders located in different places (above the corresponding cushion of the upper roll and under the corresponding cushion of the lower roll) for coarse and precise adjustment of the gap between the work rolls, as well as the cross-member and the stud-studs loaded a force exceeding the rolling force entails an increase in the dimensions and mass of the hydraulic pressure device and the stand as a whole, complication of the stand design and its maintenance, it is a disadvantage of the known roll stand with gidronazhimnym device.

The technical problem solved by the invention is to simplify the design, reduce the size and weight of the rolling stand with a hydraulic pressing device with increased rigidity, as well as simplifying its maintenance.

To solve the problem in a known rolling stand with a hydraulic pressing device containing a bed, rolls with pillows, on each side of the stand a movable link of the hydraulic cylinder of the press device for coarse adjustment of the gap between the work rolls, equipped with a stop, a movable link of the hydraulic cylinder of the press device for precise adjustment of the value the gap between the work rolls and the hydraulic cavity for lifting the upper roll, a hydraulic control panel and a pump-storage unit, with According to the invention, the hydraulic pressure device on each side of the stand is made with a common housing of the pressure cylinder, which is rigidly fixed in the stand frame above the corresponding cushion of the upper roll and in which the movable link is located for coarse adjustment of the gap between the work rolls, the stop of which is connected with the cylinder body, and movable link for fine adjustment of the gap between the work rolls, connected to the cushion of the upper roll, while between the movable links for coarse and fine adjusting the gap between the work rolls has a common hydraulic control cavity.

In special cases of execution, the crate has the following distinctive features.

According to the invention, the movable link for coarse adjustment of the gap between the work rolls is made in the form of a piston, and its emphasis is made in the housing of the pressure cylinder.

According to the invention, the movable link for coarse adjustment of the gap between the work rolls is made in the form of a piston with a rod, the rod being provided with a flange and made to support this flange against an abutment connected with the housing of the pressure cylinder.

According to the invention, the movable link for fine adjustment of the gap between the work rolls is made in the form of a piston with a rod, is fixed in its axial direction relative to the pillow of the upper roll, and the hydraulic cavity for lifting the upper roll is formed by the housing of the pressure cylinder and the movable link for fine adjustment of the gap between work rolls.

The implementation of the hydraulic pressure device on each side of the stand with a common housing of the pressure cylinder, which is rigidly fixed in the stand frame above the corresponding cushion of the upper roll and in which the movable link is located for coarse adjustment of the gap between the work rolls, the emphasis of which is connected with the hydraulic cylinder body, and the movable link for precise adjustment of the gap between the work rolls, connected to the cushion of the upper roll, and between the movable links for coarse and fine adjustment of the value There is a common hydraulic control cavity between the work rolls, which simplifies the design, reduces the dimensions and mass of the rolling stand with a hydraulic pressing device with increased rigidity, as well as simplifies its maintenance, since the hydraulic cylinder of the pressing device is compact and located in a convenient zone for access .

The implementation of the movable link for coarse adjustment of the gap between the work rolls in the form of a piston and the execution of its stop in the housing of the pressure cylinder correspond to the most simple embodiment of the pressure cylinder in terms of design and maintenance. However, in this case, the stop of the movable link for coarse adjustment of the gap between the work rolls has a fixed position, which limits the possibility of changing the thickness of the rolling limits, determined by the magnitude of the stroke of the movable link to precisely adjust the gap between the work rolls.

The implementation of the movable link for coarse adjustment of the gap between the work rolls in the form of a piston with a rod, supplying the rod with a flange and its execution with the possibility of supporting this flange against an abutment connected with the housing of the pressure hydraulic cylinder, makes it possible to vary the thickness of the rolled products over a wide range (theoretically, within the entire stroke of the movable link for coarse adjustment of the gap between the work rolls) when the pressure force acting on the movable link for coarse adjustment is closed to the pressure housing idrotsilindra and thus with a simpler structure and a smaller (compared with the prototype), size and weight of the cage.

The execution of the movable link for precise adjustment of the gap between the work rolls in the form of a piston with a rod, its fixation in the axial direction relative to the cushion of the upper roll and the formation of a hydraulic cavity for lifting the upper roll with the housing of the pressure cylinder and the movable link for precise adjustment of the clearance between the work rolls the need to have a separate hydraulic device in the stand for lifting (balancing) the upper roll (together with its pillows), As a result, the construction of the stand is simplified and its mass is reduced.

The invention is illustrated by drawings, where Fig. 1 shows a structural diagram (side view) of a rolling stand with a hydraulic pressure device with a movable link for coarse adjustment of the gap between the work rolls, made in the form of a piston, and its emphasis, made in the housing of the pressure cylinder, figure 2 is a structural diagram (side view) of a rolling stand with a hydraulic pressure device with moving links for coarse and precise adjustment of the gap between the work rolls, each of which is made in the form of a piston with a rod.

A rolling stand with a hydraulic pressing device consists of a bed 1, upper and lower work rolls 2 and 3 with pillows 4 and 5, respectively (pillows from only one end of the work rolls are shown in FIG. 1 and FIG. 2), upper and lower backup rolls 6 and 7 with pillows 8 and 9, respectively (in Fig. 1 and Fig. 2 pillows are shown from only one end of the backup rolls), a hydraulic cavity 10 for lifting the upper backup roll 6 (together with its pillows) (in Fig. 1 and Fig. .2 cavity 10 is shown only on one side of the stand) and pressurized hydrocylin ra 11 (one such hydraulic cylinder is installed on each side of the cage).

The balancing of the upper work roll 2 is carried out using special plunger hydraulic cylinders (in Fig. 1 and Fig. 2 these hydraulic cylinders are not shown) located on both sides of the stand in the pillows 5 of the lower work roll 3 and facing their plungers towards the pillows 4 of the upper work roll 2 .

Figure 1 and figure 2 shows a diagram of a four-roll stand (quarto), in the General case, the performance of the stand in the number and location of rolls in it may be different (for example, duo).

The housing 12 of the pressure cylinder 11 is rigidly fixed in the stand frame 1 above the cushion 8 of the upper roll 6 and is common for the movable link 13 for coarse adjustment of the gap between the work rolls 2 and 3, provided with a stop 14 associated with the housing 12, and for the movable link 15 for fine adjustment of the gap between the work rolls 2 and 3, which is connected to the cushion 8 of the upper roll 6. Moreover, between the movable links 13 and 15 there is a common hydraulic control cavity 16, designed for fine adjustment of the gap between in the work rolls 2 and 3, the stroke of the link 15 is greater than the stroke of the link 13 relative to the housing 12 of the hydraulic cylinder 11 by the amount of movement necessary to precisely adjust the gap between the work rolls 2 and 3, and the movable links 13 and 15 in the cavity 16 are able to enter into the power contact with each other throughout the course of the link 13.

The hydraulic control cavity 17 formed by the movable link 13 and the housing 12 of the pressure cylinder 11 serves to coarse adjust the amount of clearance between the work rolls 2 and 3.

Further, it is assumed that the effective area of the pressure cylinder 11 from the side of the control cavity 17 is greater than the effective area of the hydraulic cavity 10 for lifting the upper backup roll 6.

The hydraulic cavities 10, 16 and 17 are connected by hydraulic lines to the corresponding executive (working) channels of the hydraulic control panel 18. In turn, the hydraulic control panel 18 through the pressure hydraulic line 19 of the power supply of the lifting device, pressure hydraulic line 20 of the working pressure of the pressure device, hydraulic line 21 of constant high pressure, filling hydraulic line 22 and a drain line 23 is connected to the pump-accumulator unit 24. The pressure in the line 21 has a value at which the pressure force of the working fluid from In this case, the control cavities 17 to the movable link 13 obviously exceed the maximum force acting during rolling to the link 13 from the side of the working fluid located in the control cavity 16 and from the side of the movable link 15 (in the presence of contact between the movable links 13 and 15).

In the particular case of the rolling stand (see figure 1), the movable link for coarse adjustment of the gap between the work rolls is made in the form of a piston 13, and its emphasis is made, for example, in the form of a step 14 in the housing 12 of the pressure cylinder 11.

In another particular case of the rolling stand (see figure 2), the movable link for coarse adjustment of the gap between the work rolls is made in the form of a piston 13 with a rod 25. In this case, the rod 25 is provided with a flange 26 from its outer end and can be supported of this flange against the stop, connected with the housing 12 of the pressure cylinder 11 and made in the form of stepped spacers radially spaced relative to the axis of the hydraulic cylinder 11, mounted on the upper end surface of the housing 12 under the flange 26. To move the -stage spacers 14 to the upper end surface of the housing 12 in a direction perpendicular to the axis of the pressure cylinder 11, the spacer provided with a drive, for example, from the hydraulic cylinders 27, the working chamber being connected with corresponding actuators 18 control channels Hydropanels.

In the third particular case of the rolling stand (see figure 2), the movable link for fine adjustment of the gap between the work rolls is made in the form of a piston 15 with a rod 28. In this case, the piston 15 is connected to the pillow 8 of the upper roll 6 by means of a rod 28, which fixed relative to the pillow 8 in its axial direction (in other words, the connection of the piston 15 with the rod 28 with the pillow 8 is made without gaps). The hydraulic cavity 10 for lifting the upper roll 6 (with its pillows) is formed by the housing 12 of the pressure cylinder 11 and the piston 15 with the rod 28.

The electromagnets of the electrically controlled hydraulic units that make up the hydraulic control panel 18 are electrically connected to the corresponding outputs of the controller, the inputs of which are connected to the control panel of the rolling mill (which includes the proposed stand with a hydraulic pressure device), thickness gauges installed at the input and output of the stand, and sensors for measuring the rolling force and the coordinates of the movable link for precise adjustment of the gap between the work rolls (in figure 1 and figure 2: controller, control panel Ia, thickness gauges and sensors for measuring the rolling force and coordinates of the movable unit for the fine adjustment of the gap between the work rolls are not shown).

The proposed rolling stand with a hydraulic pressure device operates as follows.

When the upper support roll 6 is raised, the control cavity 17 of the pressure cylinder 11 is connected via the control hydraulic panel 18 to the filling hydraulic line 22, the control cavity 16 is connected to the drain hydraulic line 23, and the hydraulic cavity 10 is connected to the pressure hydraulic line 19. The movable links 13 and 15, respectively, rough and precise adjustment of the gap between the work rolls 2 and 3 by the pressure of the working fluid in the cavities 10 and 17 are pressed against each other by their ends located in the control cavity 16, and occupy their the extreme upper position in the housing 12 of the pressure cylinder 11, in which the volume of the control cavity 17 is minimal. In this case, the gap between the work rolls 2 and 3 has a maximum value. When the upper support roll 6 is raised, change (transshipment) of the work rolls 2 and 3 is carried out.

Before starting rolling, a rough adjustment of the gap between the work rolls 2 and 3 is made.

Previously, in the case of using a piston 13 with a rod 25 and a flange 26 (see figure 2) as a movable link for coarse adjustment of the gap between the work rolls 2 and 3, step spacers 14 using their drive, for example, from hydraulic cylinders 27 controlled through hydropanel 18, synchronously move to a position corresponding to the necessary rough installation of the upper roll 6.

To lower the upper backup roll 6, the hydraulic cavity 10 is disconnected from the pressure hydraulic line 19 by means of a control panel 18 and connected to the control cavity 17 of the pressure cylinder 12, which, however, remains connected to the filling hydraulic line 22. The control cavity 17 remains connected to drain line 23.

In the case under consideration, the movable links 13 and 15, respectively, for coarse and precise adjustment of the gap between the rollers, the working fluid pressure forces in the cavities 10 and 17 are pressed against each other by their ends located in the control cavity 16 and move as a unit down with the pillow 8 and roll 6. The working fluid displaced from the cavity 10, together with the working fluid supplied via the filling hydraulic line 22 from the pump-accumulator unit 24, enters the cavity 17, which allows a rough mustache during the process anovki upper roll 6 lower (at a constant lowering speed of the roll) the need flow of hydraulic fluid to the hydraulic cylinder 11 of the pressing pump-accumulator installation 24 and, thereby, in some cases, reduce the size of the pump-accumulator installation stand.

The lowering speed of the upper backup roll 6 with its rough installation is regulated using the hydraulic control panel 18.

Lowering the upper backup roll 6 at any time can be stopped by disconnecting the hydraulic cavity 10 from the control cavity 17 and locking the cavity 10 by means of the hydropanel 18.

When lowering, the upper backup roll 6 comes into contact with the upper work roll 2 and moves it down together with the pillow 4, reducing the gap between the work rolls 2 and 3.

After the movable link for coarse adjustment of the gap between the work rolls: the piston 13 (see figure 1) or the piston 13 with the rod 25 and the flange 26 (see figure 2) - will reach the stop, respectively, in the ledge 14 in the housing 12 pressure cylinder 11 (see figure 1) or in stepped spacers 14 mounted on the upper end surface of the housing 12 of the pressure cylinder 11 (see figure 2), at the signal of the corresponding sensor (figure 1 and figure 2, the sensor is not shown ) through the hydropanel 18 there is a disconnection: the cavity 10 from the cavity 17, the cavity 17 from the filler second hydraulic line 22 and the cavity 16 from the discharge line 23.

Then the cavity 17 by means of a hydropanel 18 is connected to the hydraulic line 21 of constant increased pressure.

Since the pressure in the hydraulic line 21 has a value at which the pressure force of the working fluid from the side of the control cavity 17 on the piston 13 obviously exceeds the maximum force acting in the process of rolling on the piston 13 from the side of the working fluid located in the control cavity 16 and from the movable link 15 (in the presence of contact of the movable links 13 and 15), then during rolling the position of the piston 13 relative to the housing 12 of the pressure cylinder 11 remains unchanged and the working fluid enclosed in the cavity 17 having a significant volume is not in senses changes in the rolling force and, accordingly, is not deformed. As a result, the hydraulic pressure device and rolling stand generally have increased rigidity.

Since in the proposed design of the rolling stand, the increased force acting on the movable link for coarse adjustment of the gap between the work rolls closes directly to the housing of the pressure cylinder, this increased rigidity of the stand is ensured with its optimal dimensions and weight.

Precise adjustment of the gap between the work rolls 2 and 3 is provided by means of a movable link 15 connected to the cushion 8 of the upper roll 6, by changing in antiphase the values of the working fluid pressure in the control cavities 16 and 10 by changing the area of the passage section of the working windows of the throttling valve with electric control included in the hydraulic panel 18, the pressure and drain channels of which are connected respectively to the pressure hydraulic line 20 and the drain hydraulic line 23. Throttle control The control valve is controlled by the controller based on the signals received from the control panel of the rolling mill and from the corresponding sensors (in Fig. 1 and Fig. 2: the throttling control valve, controller, control panel of the rolling mill and sensors are not shown). The volume of the working fluid in the control cavity 16 changes, and the movable link 15 (and with it the cushion 8, the backup roll 6 and the work roll 2 with the cushion 4) changes its position relative to the piston 13, the position of which during the rolling process relative to the pressure housing 12 the hydraulic cylinder 11 and, accordingly, the bed 1 of the stand, as already noted above, remains unchanged.

Compared to the case of fine adjustment of the gap between the work rolls 2 and 3 only by changing the pressure in the control cavity 16 of the pressure cylinder 11 (when connecting the cavity 10 to the pressure hydraulic line 19 through the working window with a fixed passage area in the hydraulic panel 18), the above option is implemented the stiffness of the hydraulic pressure device and the rolling stand as a whole is higher (Goydo M.E., Bodrov V.V., Bagautdinov PM On the significance of the ratio of the conductivities of working windows to the throttle control present control valve that controls a differential hydraulic cylinder // Drive Technology -. 2004. - №6 -. S.29-33).

To raise the upper backup roll 6 by an amount exceeding the movement possible within the limits of fine adjustment of the gap between the work rolls 2 and 3, the control cavity 17 of the pressure cylinder 11 is connected via the control panel 18 to the filling hydraulic line 22, the control cavity 16 to the drain hydraulic line 23 , and the hydraulic cavity 10 - with a pressure hydraulic line 19. In this case, the movable links 13 and 15, respectively, for coarse and precise adjustment of the gap between the work rolls 2 and 3 by the working fluid pressure forces ty in the cavities 10 and 17 are pressed against each other by their ends located in the control cavity 16, and move as a whole up together with the cushion 8 and the roller 6. In this case, the upper work roll 2 (together with the pillow 4) also to a certain limit moves upward under the action of the hydraulic cylinders of the balancing system of the upper work roll (in figure 1 and figure 2 these hydraulic cylinders are not shown). The working fluid from the cavity 17 when lifting the upper backup roll 6 is displaced through the filling hydraulic line 22. The lifting of the upper backup roller 6 at any time can be stopped by disconnecting the hydraulic cavity 10 from the pressure hydraulic line 19 and locking the cavity.

In accordance with the foregoing, the proposed rolling stand with a hydraulic pressing device, having increased rigidity, is characterized by a compact design of the pressing hydraulic cylinder, which is located in a convenient for access zone of the stand.

Therefore, the implementation of the proposed technical solution provides a simplification of the design, reducing the size and weight of the rolling stand with a hydraulic pressure device, as well as simplifying its maintenance.

Information sources

1. Metallurgical equipment. Modern designs of working stands of plate mills in the USSR and abroad: Collection of Research Institute of Informatyazhmash. - M., 1969. - No. 1-68. - S. 45, Fig. 16, b.

2. Rolling mill with hydraulic pressure device: USSR author's certificate No. 1126345, MKI B21B 31/32, decl. 04/27/1982, publ. 11/30/1984.

Claims (4)

1. A rolling stand with a hydraulic pressure device, comprising a bed, rolls with pillows, on each side of the stand a mobile link of the hydraulic cylinder of the pressure device for coarse adjustment of the gap between the work rolls, equipped with a stop, a movable link of the hydraulic cylinder of the pressure device for fine adjustment of the size of the gap between the work rolls and a hydraulic cavity for lifting the upper roll, a hydraulic control panel and a pump-accumulator installation, characterized in that the pressure cylinder hydraulic pressure device on each side of the stand is made with a common housing rigidly mounted in the stand frame above the corresponding cushion of the upper roll, in which there is a movable link for coarse adjustment of the gap between the work rolls, the emphasis of which is connected with the housing of the hydraulic cylinder, and a movable link for fine adjustment the gap between the work rolls, connected to the cushion of the upper roll, while between the movable links for coarse and precise adjustment of the gap between the work roll E has a common hydraulic control cavity. 2. The cage according to claim 1, characterized in that the movable link for coarse adjustment of the gap between the work rolls is made in the form of a piston, and its emphasis is made in the housing of the pressure cylinder. 3. The cage according to claim 1, characterized in that the movable link for coarse adjustment of the gap between the work rolls is made in the form of a piston with a rod, the rod being provided with a flange and made to support this flange against an abutment connected with the housing of the pressure cylinder. 4. A cage according to any one of claims 1 to 3, characterized in that the movable link for fine adjustment of the gap between the work rolls is made in the form of a piston with a rod, fixed in its axial direction relative to the cushion of the upper roll, and a hydraulic cavity for lifting the upper the roll is formed by the housing of the pressure cylinder and the movable link for fine adjustment of the gap between the work rolls.

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