RU2584363C1 - Drive shaft to transfer motion to roll - Google Patents

Abstract

FIELD: engines and pumps, machine building.

SUBSTANCE: invention relates to drive shaft for transmitting motion from electric motor or reduction gear to roll mill, particularly to pipe rolling. Device to transfer motion to roll (1) of rolling mill stand comprises telescopic shaft (5) of drive with two telescopic elements, sliding in each other in preset limits, locking mechanism with latch for fixation of two telescopic elements at reaching preset working length, elastic device, a preliminary load directed in axial direction along two telescopic elements and acting at end of sliding stroke support drive shaft with device increasing and decreasing length of drive shaft and detachment mechanism configured to remote control, to switch locking mechanism with latch in unlocked position.

EFFECT: reduced number of operations at extraction of rolls of mill, simpler and faster maintenance.

10 cl, 13 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a drive shaft for transmitting movement from an electric motor or gear reducer to a roll, in particular for rolling pipes.

State of the art

The prior art method of rolling pipes without the use of welding, performed using a mandrel on a rolling mill, which contains a group of consecutive stands with two or three rolls. The axis of rotation of the rolls of each stand of the rolling mill lie in one plane passing orthogonally to the axis of rolling.

Typically, in double roll stands, rolls installed in the same stand of the rolling mill are 90 ° from the rolls of the previous stand of the rolling mill, and in three roll stands, the rolls of each stand of the rolling mill are usually 60 ° from the rolls of the previous stand of the rolling mill in the direction rolling lines. In the three-roll stands of the rolling mill of the latter type during rolling, the movement created by the corresponding gear reducer is transmitted to the rolls of each stand of the rolling mill through the drive shafts. Examples of such stands are disclosed in EP 565772 and WO 9806515.

Due to such a mutual angular arrangement of the rolls of each stand of the rolling mill relative to the rolls of the adjacent stand of the rolling mill, one or two drive shafts extend along an inclined line between the ground and the roll at an angle usually equal to or approximately equal to 30 °, while the drive shaft of the third roll is located vertically or almost vertically.

Typically, to simplify maintenance of the stands of the rolling mill, the rolls can be removed from the stands of the rolling mill, for example, to periodically rotate the rolls or change the diameter of the rolls for rolling products of a different shape. Containers or cassettes that hold the three rolls together are designed to simplify and speed up the extraction and subsequent re-installation of the rolls. These containers have structural strength and rigidity, and can further simplify the extraction of rolls during maintenance. For example, US Pat. No. 6,276,182 discloses a cassette retrieval method that involves sliding a container across the floor in a radial direction toward a pre-selected side of a rolling mill stand.

In order to be removed from the stand of the rolling mill together with the cassette, the rolls of each stand of the rolling mill must be disconnected from the drive shaft and from the devices for adjusting the radial position of the roll mounted on the stationary structure of the rolling mill. In addition, the drive shaft, located on the path along which the cartridge must be moved to remove from the mill stand, must be removed, clearing the path so that the cartridge can be moved to the maintenance area. In a rolling mill known from WO 9806515, in order to ensure that the rolls are removed from the rolling mill stand by moving them in the radial direction, it is necessary to disconnect and move the three drive shafts from the operating position, which significantly increases the time spent on maintenance. It is also possible to install a gear reducer and an electric motor on a slider that will allow the drive shaft and gear reducer to be moved from the stand of the rolling mill if it is necessary to remove the cassette from the rolling mill.

Thus, it is preferable to reduce the time for removing the cartridge, in particular by accelerating the mounting and dismounting of the drive shaft. No. 4,945,745 discloses a telescopic drive shaft, consisting of two parts, one of which slides inside the other, while the pneumatic cylinder is used as a gas spring configured to extend two elements of the drive shaft by creating a preload on the roll to compensate for axial movement roll in such a way as to avoid possible disconnection of the drive shaft from the roll. The method of mounting and dismounting the drive shaft has not been described, however, usually such disconnection also requires the movement of the gear reducer and electric motor mounted on the rails, which is a rather time-consuming operation.

No. 6,287,208 describes a drive shaft consisting of two parts, one of which slides telescopically while moving inside the other, while the drive is held at its maximum working length by means of poppet spring packages located in the inner cavity. In this case, a traction device located outside the drive shaft is used, which ensures the return of one of the two parts of the drive shaft to the other due to telescopic movement and the creation of a very high compression force that compensates for the force of extension of the disk springs and allows you to unhook the drive shaft from the roll. The disadvantage of this method is the need to install a large number of Belleville springs in the drive shaft, which leads to an increase in the total weight of the drive shaft. In addition, this method does not guarantee a significant reduction in the length of the drive shaft.

Thus, there is a need to create a drive shaft configured to sufficiently reduce length, light weight and easy to use.

Disclosure of invention

The main objective of the present invention is to provide a rotating drive shaft connecting the slowly rotating gear shaft of the gear reducer to the roller, easy to use and lightweight, and to achieve a significant reduction in length when the drive shaft is disconnected.

Another main objective of the invention is the creation of a drive shaft, which would reduce the number of operations required to remove the rolls from the respective stands of the rolling mill, thereby simplifying and speeding up the maintenance work.

These goals are achieved by transmitting rotational motion to the roll stand of the rolling mill, containing a telescopic drive shaft with two telescopic elements, one of which slides inside the other within predetermined limits, a locking mechanism with a latch for fixing two telescopic elements when reaching a predetermined working length , an elastic device creating a preload force directed axially along two telescopic elements and acting at the end of x and sliding bearing drive shaft, the device having increasing and decreasing the length of the drive shaft and unfastening mechanism which can be remotely controlled for transfer of the locking mechanism with the latch in the unlocked position.

Also in accordance with the invention, these goals are achieved by a method of dismantling the device mentioned above from the mill stand, in which:

turn the slider of the drive shaft support upwards around the first axis X1 so as to move it from the ready position, in the angular direction from the drive shaft to the gearing position of the drive shaft, with the support located along the axis so that the ring enters the groove;

turning the drive shaft around its longitudinal axis to align the two hydraulic cylinders relative to the spring axis of the locking mechanism with a latch;

moving the first cylinder with a support a small distance to stretch the spring in the opposite direction to arrow F2, to compensate for the force generated by the elastic device to release the locking mechanism with a latch out of engagement due to the compression force;

form a compression force acting on the spring with the help of two hydraulic cylinders, which will allow the locking mechanism with the latch to translate into the unlocked position;

telescopically move the first cylinder in the direction of arrow F2 by a predetermined amount using a caliper and rotate the drive shaft down about the first axis of rotation X1.

Brief Description of the Drawings

Additional distinguishing features and advantages of the present invention will become apparent after reading a detailed description of a preferred embodiment of a device for transmitting rotary motion to a roll of a mill stand, presented as a non-limiting example with reference to the accompanying drawings, in which:

- in FIG. 1 is a front view of a rolling mill stand in which a device of the invention is installed in a working position;

- in FIG. 2 is an enlarged front view of a portion of the stand of the rolling mill of FIG. 1 in the operating position in which the device according to the invention is connected to the roll immediately before disconnecting;

- in FIG. 3 is an enlarged front view of a portion of the stand of the rolling mill of FIG. 1 in the position in which the drive shaft is located after disconnecting from the roll;

- in FIG. 4 shows a side view of a device in accordance with the invention;

- in FIG. 5 shows a section through the device along line D-D of FIG. four;

- in FIG. 6 shows an enlarged top view of part of the device of FIG. four;

- in FIG. 7 shows a longitudinal section through a component of the device of FIG. 6;

- in FIG. 8 shows a section through the device along line AA of FIG. four;

- in FIG. 9 shows a section through the device along line BB of FIG. four;

- in FIG. 10 shows a section through the device along line CC of FIG. four;

- in FIG. 11 shows an enlarged axial projection of a component of a device according to the invention;

- in FIG. 12 is a side view of the component of FIG. eleven,

- in FIG. 13 shows a section through a component along line EE of FIG. eleven.

The same reference numerals in the figures denote the same elements or components.

The implementation of the invention

In FIG. 1 shows a partial front view of the stand of the tube mill, indicated by 100, with three rolls 1, 2, 3. Several stands of the mill are located along the X axis, the number of which determines the type of mill, and these stands are located next to each other and aligned along axis X. The figures show only one stand of the rolling mill, given that specialists in the art know how the stands of the rolling mill are located relative to the axis X. Rolls 1, 2, 3 are installed in the container or cassette 4, which provides m rolling field strength and simplifies various operations of assembling and dismantling of the rolls from the rolling stand. Rolls 1, 2, 3 and cassette 4 form a single unit, indicated by 102; in FIG. 1, said block 102 is shown in position P2, in which it is offset laterally from the mill stand, after moving in the direction indicated by arrow F1, and also in position P1, in which it is installed in mill stand 100. In a preferred embodiment, the movement is provided by sliding the block 102 along the floor S, however, other known methods can be used to perform this movement from or to the stand 100 of the rolling mill.

An image of block 102 in FIG. 1 outside and inside the mill stand 100 of the rolling mill allows a better understanding of how the cassette containing the rolls of the mill stand is pulled out, and during normal operation, the mill stand 100 has one cassette 4 with rolls, which can be either outside or inside.

The rolls 1, 2, 3 are made to rotate around its axis during standard pipe processing using the corresponding drive shafts 5, 6, 7, which transmit through the gear reducers 8, 10 the movement created by the electric motors 9, 11. In a partial view of the stand 100 the rolling mill shown in FIG. 1, 2, 3, the gear reducer and the roll motor 2 are not shown.

In accordance with the invention, the block 102 in the mill stand 100 is pushed from position P1 to position P2 on the right side of the mill stand 100, as shown in a front view in FIG. 1, 2, 3. In order to push out the block 102 and place it on the side of the mill stand, as shown in FIG. 3, forcing it to slide along the floor S in the direction indicated by arrow F1, it is necessary to disconnect the connecting devices 12, 13, 14 at the end of each drive shaft 5, 6, 7 from the respective rolls 1, 2, 3. As for the drive shaft 5, disconnect of the connecting device 12 from the roll occurs simultaneously with a decrease in the length of the drive shaft 5 in the direction indicated by arrow F2, after which there is a rotation around the axis X1 parallel to the axis X of rolling, downward in the direction indicated by arrow F3. This rotation allows you to clear the passage for block 102 towards the side region to which it needs to be moved. In a preferred embodiment, it is necessary to rotate the drive shaft 5 by an angle from 10 ° to 20 °, which ensures the optimal location of the mill stand 100 of the rolling mill relative to floor S.

Given the location of the two rolls 2, 3 relative to the floor S, only disconnecting the connecting devices 13 and 14, which is preferably, but not necessary, performed together with a slight reduction in the length of the drive shafts 6, 7, allows the block 102 to be moved to the right side of the mill stand 100 of the rolling mill .

In particular, in FIG. 4-13 it is shown that the drive shaft 5 comprises a cylindrical main body 51, consisting of a first hollow cylinder 54, inside of which a second coaxial cylinder 55 is located, made with the ability to slide and move telescopically relative to the first cylinder 54. Sliding joints 54 ′ and 55 ′ with grooves are designed to provide transmission of movement between the cylinders 54 and 55.

A connecting device 12 for securing the drive shaft 5 to the roll 1 is located at the end of the first cylinder 54. In a preferred embodiment, this connecting device 12 includes a fit, for example, a shaped mount in a socket, the shape of which is suitable for roll 1. to ensure a more reliable fixation in a fixed position, the connecting device 12 is located on the piston 52, which is pressed by an elastic device 69, for example, containing springs.

Preferably, a cardanic joint 56 is fixed to the end of the second cylinder 55 next to the support base 53, however, other suitable connection types can be used to provide such movement of the drive shaft. The latching locking mechanism shown in enlarged view in FIG. 11, 12, 13, is fixedly fixed in the locking device 61 at the end of the cylinder 55, the opposite end on which the connection 56 is installed, inside the first hollow cylinder 54. The locking device 61 with a latch includes a cylindrical body 64, two of which are pivotally attached the connecting rod 62 ′ and 62 ″ with the hinges 65 ′ and 65 ″ so as to provide a small amount of pivoting movement. A spring 63 or similar elastic device generates a force pushing the connecting rods 62 ′ and 62 ″ toward their maximum tension outside the cylindrical body 64. In a preferred embodiment, to simplify the sliding of the locking device 61 with a latch inside the first cylinder 54, the rollers can be mounted at the ends of the spring 63 or next to them.

Each connecting rod 62 ′ and 62 ″ has a tooth on the outer surface that provides engagement for one of the two holes in the wall of the first cylinder 54, located in the axial direction and having a corresponding length determined by the position of the drive shaft 5 during operation.

The resilient device 69 creates a predetermined load for the two telescopic parts 54, 55, which helps to prevent accidental detachment of the locking device 61 with a latch. In addition, to secure the locking of the locking device 61 with the latch when adjusting the length of the two cylinders 54 and 55, the cylinder 54 is installed in the position behind the working point, which makes it easier to insert the locking device 61 with the latch in the corresponding holes and the subsequent installation of the two cylinders 54 and 55 in the working the position due to a slight retraction of the cylinder 54. Similarly, during disengagement, the drive shaft 5 is extended an additional amount by moving the cylinder 54 forward, and then the disengagement of the locking block is controlled devices 61 with a latch, which will be described below.

The latch locking device 61 is particularly preferred for locking the cylinders 54 and 55, which form the drive shaft 5, in the working position, while they can also be replaced by similar devices or devices with a more complex structure without departing from the essence of the invention, for example, others locking and disconnecting mechanisms with mechanical, pneumatic or hydraulic drives.

The support of the drive shaft contains a caliper 59 and a slider 50. Two hydraulic cylinders 66 ′ and 66 ″ are installed on the caliper 59, which can press on the ends of the spring 63 to overcome the force of the given spring 63 and provide retraction of two connecting rods 62 ′ and 62 ″ by a value sufficient to disconnect two teeth from the holes in the wall of the first hollow cylinder 54. In this way, the latch blocking device 61 is released, which allows the second cylinder 55 to slide telescopically inside the first cylinder 54 in the direction of decreasing drive shaft 5 lines. At the opposite end, the locking device 61 is engaged with the latch in the final position, after which, as a result of the pressure being applied by the spring 63, which pushes the two connecting rods 62 ′ and 62 ″, the length of the drive shaft 5 increases and the corresponding teeth engage in two holes in the wall first cylinder 54.

The support 59 has a groove 68 for mounting a ring 67 therein, integrated with the outer surface of the first hollow cylinder 54 and having a socket for engaging with the support 59.

The slider 50 is pivotally connected to the support base 53 so that the axis of rotation X1 preferably, but not necessarily, coincides with the axis of rotation of the universal joint 56. A hydraulic or electric actuator 57 is located between the support structure 53 and the slider 50 in a position that allows you to control rotation slider 50 around the axis X1.

The slider 50 has a hollow inner region, the shape of which allows you to install part of the first cylinder 54 and the second cylinder 55 in it. On the inner side of the slider 50 there is a support 59, which preferably has wheels sliding along two guides 58 ′, 58 ″ so as to provide sliding relative to the slider 50 in the parallel direction with the displacement of the hydraulic or electric actuator 60.

Typically, the slider 50 is rotated about an axis X1 between two angular positions relative to the drive shaft 5 during installation and disconnection of the drive shaft 5. In FIG. 2, 3, 4, a first position is shown in which the slider 50 is aligned and engaged in the drive shaft 5, and in FIG. 1 shows a second position in which the slider 50 is angled and disconnected from the drive shaft 5. When the slider 50 is in a aligned, engaged position with respect to the drive shaft 5, it moves with the drive shaft 5 in an angular direction about the axis of rotation X1. In the second disconnected position of the drive shaft 5, the slider 50 allows the drive shaft 5 to rotate and drive the roll 1 in motion.

The disconnection of the drive shaft 5 from the roll 1 is as follows. The slider 50, which is initially angled and disconnected from the drive shaft 5, is rotatable around the axis X1 and can be set in the engaged position parallel to the drive shaft 5 with an actuator 57. The support 59 is arranged along the slider 50 so as to install two pistons 66 ′ and 66 ″ of the hydraulic cylinder on the axis of the spring 63 due to the controlled rotation of the main motor of the mill stand 100 in such a way as to align the groove 68 with respect to the ring 67, combining them with the support m 59, a slider 50 and a hollow cylinder 54. A short transmission of the movement of the cylinder 54 in the opposite direction of the arrow F2 is sufficient to compensate for the force of the elastic device 69, which holds the locking device 61 with a latch in a fixed position due to the engagement of the rods 62 ′, 62 ″ in the respective sockets, which facilitates the exit of the connecting rods from the holes in the cylinder 54. Almost simultaneously, two pistons 66 ′, 66 ″ are driven in such a way as to create pressure on the spring 63, which compresses it and directs the rod s inside the cylinder 54. Thus, block 61 exits the cylinder 54 and can slide telescopically moving inside it. The support 59 is moved along the axis of the drive shaft using the actuator 60 so as to move the hollow cylinder 54 in the direction of the arrow F2 (while the ring 67 is not disconnected from the support 59) until the predetermined tensile value is necessary so that the drive shaft 5 has been moved enough to free up space in front of block 102, as shown in FIG. 3, due to the rotational movement in the direction indicated by the arrow F3.

After that, the block 102 is removed from the stand 100 of the rolling mill from the side.

The installation of the block 102 in the stand 100 of the rolling mill is performed in the reverse order compared to the dismantling procedure.

Although the above is a description of a drive shaft for transmitting movement to a roll of a mill stand, the apparatus of the invention can also be used in a mill stand for other types of metal products, for example, rods, profiles, and so on.

Claims (10)

1. A device for transmitting movement to a roll (1) of a stand (100) of a rolling mill, comprising:
telescopic shaft (5) of the drive with two telescopic elements (54, 55), sliding in each other within predetermined limits,
a locking mechanism (61) with a latch for fixing two telescopic elements (54, 55) upon reaching a predetermined working length,
an elastic device (69) creating a preliminary load directed axially along two telescopic elements (54, 55) and acting at the end of the sliding stroke, and
a support for the drive shaft having a device (60) for increasing and decreasing the length of the drive shaft and an unlocking mechanism (66 ′, 66 ″) configured to remotely control the locking mechanism (61) with the latch in the unlocked position. 2. The device according to claim 1, in which one of the two indicated telescopic elements (54) has an internal cavity and a first end containing a connecting device (12) attached to the roll (1), and the second telescopic element (55) located coaxially the first cylinder of the telescopic element (54), has a first end located in the inner cavity of the first cylinder of the telescopic element (54), and a second end containing a universal or universal joint (56) mounted on the shaft of the transmission of motion with the possibility of providing l of moving the shaft (5) of the drive relative to the stand (100) of the rolling mill. 3. The device according to claim 2, in which the support of the drive shaft contains:
a slider (50) with at least one loop (70 ′, 70 ″) at the first end defining the first axis of rotation (X1) so as to provide angular movement of the slider (50) relative to the stand (100) of the rolling mill around the first axis ( X1) rotation, and
a support (59) sliding in the longitudinal direction along the slider (50), containing devices (68) for disengaged connection with the first cylinder (54), the first actuator (57), designed to rotate the slider (50) around at least one loop (70 ′, 70 ″), while
the device (60) for increasing and decreasing the length of the drive shaft is designed to ensure sliding of the caliper (59) relative to the slide (50). 4. The device according to claim 3, in which the first axis of rotation (X1) is parallel to the axis (X) of the rolling when installed on the stand (100) of the rolling mill. 5. The device according to claim 4, in which said hinge (56) has a node for connecting the shaft (5) of the drive and the axis of transmission of motion, coinciding with the first axis (X1) of rotation of at least one loop (70 ′, 70 ″). 6. The device according to claim 5, in which the locking devices contain a groove (68) on the caliper (59) and a peripheral ring (67), which is part of the surface of the first cylinder of the telescopic element (54). 7. The device according to claim 5, containing a support base (53), to which at least one loop (70 ′, 70 ″) is attached. 8. The device according to claim 1, in which the device for translating the locking mechanism (61) with the latch in the unlocked position contains two hydraulic pistons that form a compressive force acting on the ends of the spring (63) and ensure the locking of the locking mechanism (61) with latch in the locked position. 9. The method of dismantling from the stand (100) the rolling mill of the device according to one of paragraphs. 1-8, in which:
rotate the slider (50) of the support of the drive shaft upwards around the first axis (X1) so as to move it from the ready position, in the angular direction from the shaft (5) of the drive to the engaged position of the shaft (5) of the drive, with the support (59) located along the axis so that the ring (67) enters the groove (68),
rotate the drive shaft (5) around its longitudinal axis in such a way as to align the two hydraulic cylinders (66 ′, 66 ″) relative to the axis of the spring (63) of the locking mechanism (61) with a latch,
move the first cylinder (54) with a support (59) to stretch the spring in the opposite direction to arrow F2, to compensate for the force exerted by the elastic device (69) to release the locking mechanism (61) with the latch out of engagement,
form a compressive force acting on the spring (63) using two hydraulic cylinders of the release mechanism (66 ′, 66 ″), allowing the locking mechanism (61) to be latched to the unlocked position,
telescopically move the first cylinder of the telescopic element (54) in the direction of the arrow F2 by a predetermined amount using the caliper (59), and
rotate the drive shaft (5) down around the first axis of rotation (X1). 10. A crate (100) of a rolling mill for rolling metal products, comprising a device according to one of claims. 1-8.

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