CN117680496A - U-E tandem rolling tail-flick preventing device for controlling high point of steel rail end - Google Patents

Abstract

The invention relates to the technical field of steel rolling equipment, in particular to a U-E continuous rolling tail-flick preventing device for controlling the high point of the end part of a steel rail. The invention relates to a U-E tandem rolling tail-flick preventing device for controlling the high point of the end part of a steel rail, which comprises a hydraulic clamping device, wherein the hydraulic clamping device is arranged between a universal rolling mill and an edging mill, and comprises: the device comprises a head roller, a bottom roller and a guide driving mechanism. The waist of the head roller adopts arc transition, and the arc is used for being in compression fit with the steel rail head. The bottom roller is a flat roller and is used for being in press fit with the bottom plate of the steel rail. The guiding driving mechanism is used for driving the head roller and the bottom to approach or separate from the steel rail so as to clamp or release the steel rail in the height direction. At the moment that the steel rail is separated from the universal rolling mill, the guide driving mechanism drives the head roller and the bottom roller to rapidly and hydraulically clamp the steel rail in the height direction, so that the tail of the steel rail is prevented from being thrown, the steel rail smoothly enters the E rolling mill (edging mill), and the defect of high points at the tail of the steel rail is effectively overcome.

Description

U-E tandem rolling tail-flick preventing device for controlling high point of steel rail end

Technical Field

The invention relates to the technical field of steel rolling equipment, in particular to a U-E continuous rolling tail-flick preventing device for controlling the high point of the end part of a steel rail.

Background

Along with the high-speed development of China railways, the influence of the rail through length dimensional accuracy on the running stability of the train is more and more prominent. The fluctuation of the through length can cause a snake-shaped swing to appear when the train runs, so as to alarm the stop. The rail is influenced by the rolling mode and the metal flow rule in the rail rolling process, the rail height and the rail bottom size fluctuation are large, the rail bottom is not in direct contact with the train wheels, and the train operation is hardly influenced. The track height is a critical dimension affecting the stability of train operation, such as short wavelength irregularity in train operation, which is caused by fluctuation in track height.

When the rolled piece is stably rolled in the continuous rolling unit, the rolled piece is in a flat state. However, the straight state is controlled by rolling force and continuous rolling tension between frames, and bending stress formed by different head-bottom extension coefficients exists in the rolled piece. When the tail part of the rolled piece is separated from the hole type of the last frame, the bending stress of the rolled piece is released instantaneously to generate bending in a natural state. The tail flick phenomenon occurs because of the rapid release of the bending stress. The rolling "tail flick" will create a "rocking" force in the web direction, thereby causing the metal in the next pass (the sidedraw or UF pass) to move in the web direction. The metal in the rail web direction in the edge rolling hole is in a free widening state, the suddenly increased force can enable the metal to flow to a roll gap at one side, and the height of the roll gap is far smaller than that of a head or a bottom, so that the width of the metal increased at the roll gap in the rail web direction is far larger than that of the head or the bottom, and the rail height at the moment of tail flicking after synthesis is also larger than that in a normal rolling state, namely a high point is formed. When the high point exceeds the standard control limit, the steel rail must be scrapped and treated, so that serious material waste is caused.

The defect of the steel rail is the potential safety hazard of train operation, and the local high point in the longitudinal direction of the steel rail is one of the defects. The high point prominence is represented by the phenomenon that when a universal rolling mill (U) and an edging mill (E) are continuously rolled, the U rolling mill loses tension instantly, and the section size of the adjacent area of a rolled piece in the E rolling mill is suddenly increased and then rapidly reduced. In theory, the high points should be eliminated in the hot rolled state, because the rail structure is already hardened and formed in the cold state, the high points are relatively steep, and some of the high points are not only one size-enlarging, so that the high points are difficult or impossible to eliminate by using a straightener and a straightening device. When U-E continuous rolling is needed, the tail flick is controlled, and the severe fluctuation of the specification and the size in the tail flick process is prevented.

The rail height point problem existing in the conventional continuous rolling process of the heavy rail is commonly known, and the conclusion that the instant tail flick is a main factor of the formation of the height point when a rolled piece is separated from a roller is obtained. The method provides measures for reducing or eliminating high points, such as controlling continuous rolling tension, adjusting the gap of a steel-tapping side guide plate, increasing continuous rolling pass, optimizing head-bottom extension coefficient and the like.

The invention patent with the publication number of CN109078987B provides a method for reducing the high point of the tail of a steel rail in universal continuous rolling, which comprises a universal horizontal upper roller, a universal horizontal lower roller, a universal vertical roller left roller and a universal vertical roller right roller, wherein when the rolling piece of the previous pass of finished product hole is thrown tail 0.3-1.5 m, the roll gap value of the universal rolling mill is changed, namely the rolling reduction of the universal horizontal upper roller relative to the universal horizontal lower roller is reduced by 2-6mm, and the rolling reduction of the universal vertical roller left roller relative to the universal vertical roller right roller is increased by 3-6mm, so that the rolling force is reduced in tail throwing, and the method is suitable for process control for reducing the high point of the tail of the steel rail in universal continuous rolling. The above approach may improve track height but is not fully effective. Based on this, the prior art still remains to be improved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a U-E continuous rolling tail-flick prevention device for controlling the high point of the end part of a steel rail, which at least can solve the problem that the existing method for reducing the high point of the end part of the steel rail has poor effect in implementation.

The invention relates to a U-E tandem rolling tail-flick preventing device for controlling the high point of the end part of a steel rail, which comprises a hydraulic clamping device, wherein the hydraulic clamping device is arranged between a universal rolling mill and an edging mill, and comprises: the device comprises a head roller, a bottom roller and a guide driving mechanism. The waist of the head roller adopts arc transition, and the arc is used for being in compression fit with the steel rail head. The bottom roller is a flat roller and is used for being in press fit with the bottom plate of the steel rail. The guiding driving mechanism is used for driving the head roller and the bottom roller to be close to or far away from the steel rail so as to clamp or release the steel rail in the rail height direction.

Further, the upper and lower spans of the circular arcs on the head roller are 1.5-2 times of the width of the steel rail head.

Further, the height of the head roller is 2.5-3 times of the head of the rolled rail. The height of the head roller is 280-320 mm, and the diameter phi is 220-280 mm; the arc radian of the head roller is matched with the arc radian of the head of the steel rail, and the radius of the arc is 10-30 mm.

Further, the height of the bottom roller is 2-2.5 times of the width of the bottom of the rolled steel rail; the height of the bottom roller is 300-375 mm, and the diameter phi is 220-280 mm.

Further, the head roller and the bottom roller are made of high-carbon semisteel.

Further, two guide driving mechanisms are provided, and the two guide driving mechanisms correspond to the head roller and the bottom roller respectively; each guide driving mechanism comprises a guide frame and a hydraulic cylinder, both ends of the head roller or the bottom roller are rotatably arranged on the guide frame, a piston rod of the hydraulic cylinder is connected with the guide frame, and the hydraulic cylinder is used for driving the guide frame to move along a preset moving direction perpendicular to the steel rail.

Further, the guiding driving mechanism further comprises a horizontal slideway for guiding the guiding frame, and the horizontal slideway is arranged on the machine frame housing through the base.

Further, the head roller and the bottom roller are connected with the guide frame by bearings, and the head roller and the bottom roller are arranged to rotate passively.

Further, the piston rod of the hydraulic cylinder drives the guide frame to move by 0-100 mm, and the thrust of the hydraulic cylinder is more than 4000KN.

Further, the U-E tandem rolling tail-flick prevention device for controlling the high point of the end part of the steel rail further comprises a thermal detection and control system, wherein the thermal detection is arranged at the inlet of the U rolling mill and used for detecting the thermal detection of the time node when the steel rail completely enters the U rolling mill, and the control system calculates the action time of the hydraulic clamping device according to the rolling speed of the steel rail and the distance from the thermal detection to the hydraulic clamping device and implants the compaction action into the hydraulic clamping device.

The beneficial effects of the invention are as follows: according to the invention, the head roller, the bottom roller and the guide driving mechanism are arranged, so that the guide driving mechanism drives the head roller and the bottom roller to rapidly and hydraulically clamp the rail in the rail height direction at the moment that the rail is separated from the universal rolling mill, the rail is prevented from swinging the tail, and the rail smoothly enters the E rolling mill (edging mill), and the defect of high points at the tail of the rail is effectively solved.

Drawings

FIG. 1 shows a schematic diagram of the installation position of a U-E tandem rolling tail flick prevention device for controlling the high point of the end part of a steel rail, which is provided by the embodiment of the invention;

fig. 2 shows a schematic structural diagram of a U-E tandem rolling tail flick prevention device for controlling a high point at a rail end provided by an embodiment of the present invention.

Reference numerals illustrate:

1. a U rolling mill; 2. e, pressing; 3. a guide and guard device; 4. a head roller; 5. a bottom roller; 6. a bearing; 7. a steel rail; 8. a guide is arranged; 9. a lower guide; 10. a hydraulic cylinder; 11. a guide frame; 12. a horizontal slideway; 13. a frame housing; 14. a universal horizontal upper roller; 15. a universal horizontal lower roller; 16. a universal vertical stick; 17. edging horizontal upper roller; 18. edging horizontal lower rolls; 19. a hydraulic clamping device; 20. and (3) arc.

Detailed Description

It should be understood that the embodiments of the invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the teachings of the subject matter of this disclosure. Accordingly, all such modifications are intended to be included within the scope of present invention. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and parameters of the exemplary embodiments without departing from the spirit of the present inventions.

The invention provides a U-E tandem rolling tail-flick prevention device for controlling the high point of the end part of a steel rail, which comprises a hydraulic clamping device 19 arranged between a universal rolling mill (U rolling mill 1) and an edge rolling mill (E press 2), wherein the U rolling mill 1 is mainly used for rolling various steel types, and the main functions of the U rolling mill are as follows, such as H-shaped steel, steel rail, I-shaped steel, channel steel, sheet piles, U-shaped steel, L-shaped steel, unequal angle steel and the like. The U rolling mill 1 is composed of a universal horizontal upper roll 14, a universal horizontal lower roll 15 and a pair of universal vertical rolls 16, and the roll axes are in the same vertical plane. The E-press 2 comprises an upper edging horizontal roll 17 and a lower edging horizontal roll 18 for rolling the unshaped metal material into products of predetermined shape and size, such as pipes, plates, etc. As shown in fig. 2, the hydraulic clamping device 19 includes: a head roller 4, a bottom roller 5 and a guiding driving mechanism. The waist of the head roller 4 adopts an arc 20 for transition, and the arc 20 is used for being in compression fit with the head of the steel rail 7. The bottom roller 5 is a flat roller for press fit with the bottom plate of the rail 7. The guiding driving mechanism is used for driving the head roller 4 and the bottom roller 5 to approach or separate from the steel rail 7 so as to clamp or release the steel rail 7 in the rail height direction. Specifically, at the moment that the steel rail 7 is separated from the universal rolling mill, the guide driving mechanism drives the head roller 4 and the bottom roller 5 to rapidly and hydraulically clamp the steel rail 7 in the rail height direction, so that the tail of the steel rail 7 is prevented from being thrown, the steel rail 7 smoothly enters the E rolling mill (edging mill), and the defect of high points at the tail of the steel rail 7 is effectively overcome.

In some embodiments, the upper and lower span of the arc 20 on the head roller 4 is 1.5-2 times of the width of the head of the steel rail 7, and the radian of the arc is matched with the radian of the head of the steel rail 7, so that the arc 20 of the head roller 4 is matched with the swing amplitude of the steel rail 7, and the arc 20 plays a role in compacting and limiting the steel rail 7.

In some embodiments, considering the limitation of the head roller 4 on the swing of the steel rail 7, the height of the head roller 4 is 2.5-3 times of the head of the steel rail 7 to be rolled; the height of the head roller 4 is 280-320 mm, and the diameter phi is 220-280 mm; the arc 20 radian of the head roller 4 is matched with the arc of the head of the steel rail 7, and the radius R of the arc 20 is 10-30 mm. For example, the head roll 4 is set to 320mm, the diameter Φ is 280mm, and the radius R of the arc 20 is 11mm.

In some embodiments, considering the limitation of the bottom roller 5 on the swing of the rail 7, the bottom roller 5 has a height 2 to 2.5 times the width of the bottom of the rolled rail 7; the height of the bottom roller 5 is 300-375 mm, and the diameter phi is 220-280 mm. For example, the bottom roll 5 is designed to have a height of 320mm and a diameter Φ280mm.

In some embodiments, the head roller 4 and the bottom roller 5 are made of high carbon semisteel, which can provide enough strength for clamping the steel rail 7.

In some embodiments, there are two guiding driving mechanisms, corresponding to the head roller 4 and the bottom roller 5, respectively; each guide driving mechanism includes a guide frame 11 and a hydraulic cylinder 10, and both the upper and lower ends of the head roll 4 or the bottom roll 5 are rotatably mounted to the guide frame 11. The hydraulic cylinder 10 is located one side of the guide frame 11 far away from the steel rail 7, a cylinder barrel of the hydraulic cylinder 10 is installed on the frame, a piston rod of the hydraulic cylinder 10 is connected with the guide frame 11, and the hydraulic cylinder 10 is used for driving the guide frame 11 to move along a preset moving direction perpendicular to the steel rail 7, so that the guide frame 11 drives the head roller 4 and the bottom roller 5 to move.

In some embodiments, the guiding driving mechanism further comprises a horizontal slideway 12 for guiding the guiding frame 11, the horizontal slideway 12 is mounted on the frame housing 13 through a base, the lower ends of the head roller 4 and the bottom roller 5 are slidably inserted into the horizontal slideway 12, and the horizontal slideway 12 mainly bears the weight of the head roller 4 and the bottom roller 5 and the guiding driving mechanism.

In some embodiments, the head roller 4 and the bottom roller 5 are connected with the guide frame 11 by adopting bearings 6, and the head roller 4 and the bottom roller 5 are arranged to rotate passively, the rotation power of the rotation power is from the friction force of the rolled piece of the steel rail 7, so that the rolled piece is prevented from being scratched caused by the asynchronous speed of the roller and the roller.

In some embodiments, the travel of the piston rod of the hydraulic cylinder 10 driving the guide frame 11 to move is 0-100 mm, the travel of which is measured and controlled by a sensor, and the thrust of the hydraulic cylinder 10 is greater than 4000KN to satisfy the clamping force on the steel rail 7.

In some embodiments, the U-E tandem rolling tail flick prevention device for controlling the high point of the end part of the steel rail 7 further comprises a thermal detection and control system, wherein the thermal detection is arranged at the inlet of the U rolling mill 1, the thermal detection is used for detecting the time node when the steel rail 7 completely enters the U rolling mill 1, and the control system calculates the action time of the hydraulic clamping device 19 according to the rolling speed of the steel rail 7 and the distance from the thermal detection to the hydraulic clamping device 19, and implants the compaction action into the hydraulic clamping device 19. The time point and the detachment degree of compression of the compression roller are accurately controlled, and manual intervention is not needed. The operator does not need special professional training or experience, and carefully executes the operation rules.

The working principle and the working method of the U-E tandem rolling tail-flick prevention device for controlling the high point of the end part of the steel rail provided by the embodiment of the invention are as follows:

the front and rear ends of the U rolling mill 1 and the E press 2 are respectively provided with a guide device 3 to ensure that rolled pieces can accurately enter and exit the hole patterns according to the specified position, direction and required state, as shown in fig. 2, the guide device 3 above the steel rail 7 is an upper guide 8, and the guide device 3 below the steel rail 7 is a lower guide 9, which correspond to the upper roller and the lower roller of the U rolling mill 1 or the E press 2 respectively. In the continuous rolling process of the rollers of the U-E rolling mill, the head roller 4 and the bottom roller 5 wait at the middle stroke (50 mm) of the piston rod, the distance between the hydraulic clamping device 19 and the guide device 3 is 1.5 m, the rolling speed of the steel rail 7 is calculated according to 4 m/s, when the tail part of the steel rail 7 rolled piece is separated from the front 0.7 s of the guide device 3 of the universal U rolling mill 1, the control system respectively controls the head roller 4 and the bottom roller 5 to rapidly translate, the translation distance is 50mm, the translation time is 0.5 s, the compaction action is carried out according to a signal transmitted by a thermal inspection arranged at the inlet of the U rolling mill 1, the head part and the bottom of the steel rail 7 are respectively contacted for 0.2 s before the steel rail 7 rolled piece is separated from the guide device 3 of the U rolling mill 1, so as to generate compression, the center distance between the waist parts of the head roller 4 and the bottom roller 5 is equal to the rail height of the rolled piece of the steel rail 7 (calculated by the hole type size of the universal U rolling mill 1 and the current actual roll gap value), so that the rolled piece of the steel rail 7 is always in a clamped state, the steel rail 7 cannot swing violently in the horizontal direction (namely 'tail flick') when being separated from the universal U rolling mill 1, after the tail part of the steel rail 7 bites into an E rolling mill, a roller driving unit respectively regulates and controls the head roller 4 and the bottom roller 5 to translate rapidly, the translation distance is 50mm, the translation time is 0.5 seconds, the original waiting position is returned, the next steel rail 7 is waited, the same actions are repeated, and the rolling reduction and the roller stroke can be regulated and controlled by a control element of a control system according to the requirement, so that the tail flick degree is regulated.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention; modifications and equivalent substitutions are intended to be included in the scope of the claims without departing from the spirit and scope of the present invention.

Claims (10)

1. The U-E tandem rolling tail flick prevention device for controlling the high point of the end part of a steel rail is characterized by comprising a hydraulic clamping device (19), wherein the hydraulic clamping device (19) is arranged between a universal rolling mill and an edging mill, and the hydraulic clamping device (19) comprises:

the waist of the head roller (4) is transited by adopting an arc (20), and the arc (20) is used for being in compression fit with the head of the steel rail (7);

the bottom roller (5) is a flat roller and is used for being in press fit with the bottom plate of the steel rail (7);

and the guide driving mechanism is used for driving the head roller (4) and the bottom roller (5) to be close to or far away from the steel rail (7) so as to clamp or release the steel rail (7) in the rail height direction.

2. The U-E tandem rolling tail-flick preventing device for controlling the high point of the end part of a steel rail according to claim 1, wherein the upper and lower spans of the circular arc (20) on the head roller (4) are 1.5-2 times of the width of the head of the steel rail (7).

3. The U-E tandem rolling tail-flick prevention device for controlling the high point of the end part of a steel rail according to claim 2, wherein the height of the head roller (4) is 2.5-3 times of the head of the steel rail (7) to be rolled; the height of the head roller (4) is 280-320 mm, and the diameter phi is 220-280 mm; the radian of the arc (20) on the head roller (4) is matched with the radian of the head of the steel rail (7), and the radius of the arc (20) is 10-30 mm.

4. The U-E tandem rolling tail-flick prevention device for controlling the high point of the end part of a steel rail according to claim 1, wherein the height of the bottom roller (5) is 2-2.5 times of the width of the bottom of the steel rail (7); the height of the bottom roller (5) is 300-375 mm, and the diameter phi is 220-280 mm.

5. The U-E tandem rolling tail flick preventing device for controlling the high point of the end part of a steel rail according to claim 1, wherein the head roller (4) and the bottom roller (5) are made of high-carbon semisteel.

6. The U-E tandem rolling tail-flick prevention device for controlling the high point of the end part of a steel rail according to claim 1, wherein two guide driving mechanisms are arranged, and the two guide driving mechanisms correspond to a head roller (4) and a bottom roller (5) respectively; each guide driving mechanism comprises a guide frame (11) and a hydraulic cylinder (10), both ends of the head roller (4) or the bottom roller (5) are rotatably arranged on the guide frame (11), a piston rod of the hydraulic cylinder (10) is connected with the guide frame (11), and the hydraulic cylinder (10) is used for driving the guide frame (11) to move along a preset moving direction perpendicular to the steel rail (7).

7. The U-E tandem rolling tail flick prevention device for controlling the high point of a rail end according to claim 6, wherein said guiding driving mechanism further comprises a horizontal slideway (12) for guiding said guiding frame (11), said horizontal slideway (12) being mounted on a frame housing (13) by a base.

8. The U-E tandem rolling tail flick preventing apparatus for controlling a high point of a rail end according to claim 6, wherein the head roller (4) and the bottom roller (5) are connected with the guide frame (11) by bearings (6), and the head roller (4) and the bottom roller (5) are arranged to be passively rotated.

9. The U-E tandem rolling tail-flick preventing device for controlling the high point of the end part of a steel rail according to claim 6, wherein the stroke of the piston rod of the hydraulic cylinder (10) driving the guide frame (11) to move is 0-100 mm, and the thrust of the hydraulic cylinder (10) is more than 4000KN.

10. The U-E tandem rolling tail flick preventing apparatus for controlling a high point of a rail end according to claim 6, further comprising a thermal inspection and control system, wherein the thermal inspection is provided at an inlet of the U rolling mill (1), the thermal inspection is used for detecting a thermal inspection of a time node when the rail (7) completely enters the U rolling mill (1), and the control system calculates an action time of the hydraulic clamping device (19) according to a rolling speed of the rail (7) and a distance from the thermal inspection to the hydraulic clamping device (19), and implants a compacting action into the hydraulic clamping device (19).