CN112756442A - Steel clamping device, steel clamping structure and method for improving pre-straightening flatness of end part of steel rail - Google Patents
Steel clamping device, steel clamping structure and method for improving pre-straightening flatness of end part of steel rail Download PDFInfo
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- CN112756442A CN112756442A CN202011615170.2A CN202011615170A CN112756442A CN 112756442 A CN112756442 A CN 112756442A CN 202011615170 A CN202011615170 A CN 202011615170A CN 112756442 A CN112756442 A CN 112756442A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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Abstract
The invention discloses a steel clamping device, a steel clamping structure and a steel clamping method for improving the straightness of the end part of a steel rail before straightening, relates to the field of metallurgy, and solves the problem that the end part of the steel rail is bent after reverse pre-bending and before straightening. Improve steel rail tip straightness's before straightening card steel device, including box and checkpost, the top of box sets up the mounting groove, and the lower part of checkpost is assembled in the mounting groove, upper portion is located outside the mounting groove. A steel clamping structure for improving the straightness of the end part of a steel rail before straightening comprises a cooling bed, the steel rail and a steel clamping device, wherein a box is fixedly arranged on the side surface of a static beam, the steel rail is reversely pre-bent and is arranged in the cooling bed, and the top of a clamp is clamped at the joint of the head and the web of the steel rail or the joint of the web and the bottom of the steel rail. The method for improving the straightness of the end part of the steel rail before straightening comprises the following steps that after the steel rail is finally rolled on a cooling bed, a pre-bending trolley performs reverse pre-bending on the steel rail; the steel clamping structure clamps the steel rail; the walking beam is lifted, and the steel rail is lifted along with the walking beam and is separated from the clamp. The invention is used for improving the straightness of the steel rail before straightening.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a steel clamping device, a steel clamping structure and a steel clamping method for improving the straightening straightness of the end part of a steel rail.
Background
The steel rail enters a cooling bed for cooling after being rolled, and the whole steel rail is relatively straight when just going to the cooling bed. If pre-bending is not performed, the rail will bend towards the rail head with a higher heat capacity after being completely cooled. In order to reduce the bending degree of the steel rail before straightening, the steel rail needs to be pre-bent in the opposite direction just after being rolled on a cooling bed.
When the steel rail is reversely pre-bent, the steel rail is lifted and leveled under the action of the pre-bent head, and the center line of the rail web is in a basically horizontal state; after reverse pre-bending, when the steel rail is placed on the static beam of the cooling bed, the steel rail is in a natural placing state, and the heavy rail inclines to the head. The pre-bending trolley is influenced by the safety interlocking condition that the next steel can be received only by the rolling rhythm and the return zero position of the pre-bending trolley, the pre-bending trolley cannot be kept for a long time after the pre-bending trolley is in place, the pre-bending trolley can only be kept for 1-2 seconds generally, and the steel rail is bound to rebound due to the fact that the pre-bending trolley is short in holding time. Meanwhile, the existing pre-bending trolley only has a clamping platform type design for limiting the rail bottom direction not to return, the rail head direction deformation generates larger traction force, the pre-bending trolley does not have a stabilizing device for resisting the rail head direction traction force, and if the pre-bending trolley stops for a period of time after pre-bending is in place, the pre-bending trolley moves towards the rail head direction under the influence of the traction force generated by the rail head deformation.
The middle part of the steel rail is restrained by the friction of the steel rail and the friction of the steel rail at the adjacent part until the steel rail is cooled and basically keeps the pre-bending state. However, the steel rail at the end of the steel rail is not restrained by the friction force of the adjacent steel rail except the self friction force, and meanwhile, the cooling speed is far higher than that of the middle part, so that the bending degree of the end of the steel rail is difficult to be restrained and an ideal pre-bending state is kept, and the difference between the bending degree of the end and the bending degree of the full length is larger when the steel rail is straightened. The straightening machine is limited by the structure, and an end straightening blind area exists during straightening. Due to the reasons, the straightness of the end part of the steel rail is poor, long-time supplementary straightening is required in a post-process, and the production rhythm and the quality of the end part of the steel rail are influenced.
Disclosure of Invention
The invention firstly provides a steel clamping device which is used for being arranged on the side surface of a static beam of a cooling bed, solves the problem that the end part of a steel rail is bent after reverse pre-bending and before straightening, and aims to improve the straightness of the steel rail before straightening.
The technical scheme adopted by the invention is as follows: improve steel rail tip straightness's before straightening card steel device, including box and checkpost, the top of box sets up one or more mounting grooves, and at least one of checkpost just is the column, and the lower part of checkpost assembles in the mounting groove, and the upper portion of checkpost is located outside the mounting groove.
Further, the method comprises the following steps: the box top sets up a plurality of mounting grooves, and the size of each mounting groove is unanimous, and each mounting groove is equidistant to be arranged and the central line is parallel to each other.
Further, the method comprises the following steps: a plurality of clamping blocks are arranged in the box at intervals, mounting grooves are formed between the clamping blocks, and the clamping blocks and the box are welded and fixed or fixed through screws.
Further, the method comprises the following steps: the box is internally provided with a sliding chute, two clamping blocks are placed in the sliding chute, a mounting groove is formed between the two clamping blocks, and at least two tightening bolts matched with the clamping blocks are respectively arranged at two ends of the sliding chute.
Specifically, the method comprises the following steps: the box is made of a steel plate, and the clips are steel bars and are quadrangular; the outer contour of the box is cuboid, the length is 150mm, the height is 50mm, the depth is 100mm, and the height of the clip is 150 mm.
The invention also provides a steel clamping structure which also solves the problem that the end part of the steel rail is bent after the steel rail is reversely pre-bent and before the steel rail is straightened. The steel clamping structure comprises a cooling bed, a steel rail and any steel clamping device for improving the pre-straightening flatness of the end part of the steel rail, wherein the cooling bed comprises a static beam and a walking beam, a box is fixedly arranged on the side surface of the static beam, the top surface of the box is flush with or lower than the top surface of the static beam, and the top height of the clamp is smaller than the maximum lifting height of the walking beam; the steel rail is reversely pre-bent and placed on a cooling bed, and the top of the clamp is clamped at the joint of the rail head and the rail web or the joint of the rail web and the rail bottom of the steel rail.
Specifically, the method comprises the following steps: the height of the top of the clip relative to the top surface of the static beam is 10-15 mm larger than half of the width of the steel rail head.
The steel clamping device and the steel clamping structure for improving the pre-straightening flatness of the end part of the steel rail have the beneficial effects that: after the pre-bending trolley performs reverse pre-bending on the steel rail, the top of the clamp is clamped at the joint of the rail head and the rail web of the steel rail or the joint of the rail web and the rail bottom of the steel rail, so that the reverse pre-bending state of the steel rail is maintained, the rebound phenomenon of the steel rail after the steel rail is separated from the pre-bending trolley is avoided, the purpose of improving the straightness of the front end of the steel rail before straightening is achieved by limiting the deformation tendency of the steel rail to bend towards the rail head on a cooling bed, the abrasion loss of a straightening ring in the subsequent straightening stage is reduced, meanwhile, the upward bending of the front end of the steel rail after straightening is also reduced, and the time consumed by pressure; the problem that the leg tip and the side surface of the rail head are scratched due to overlarge bending of the end part of the supplied material can be prevented.
After the clips limit the deformation trend of the steel rail for a certain time, the walking beam is lifted, the steel rail is lifted along with the walking beam and separated from the clips, and the clips do not influence the production rhythm. The box top sets up a plurality of mounting grooves, places a checkpost in different mounting grooves, can restrict the rail of different reverse preflex degree. The mounting groove is formed by a clamping block, the structure is simple, the fixing is firm, and the bearing capacity is large.
The invention also provides a method for improving the straightness of the end part of the steel rail before straightening, and solves the problem that the straightness of the end part of the steel rail is poor when the steel rail is reversely pre-bent according to the existing method after being rolled. The technical scheme adopted by the invention for solving the problem is as follows: the method for improving the straightness of the end part of the steel rail before straightening comprises the following steps that after the steel rail is finally rolled on a cooling bed, firstly, a pre-bending trolley carries out reverse pre-bending on the steel rail; then, the steel rail is clamped through any steel clamping structure for improving the straightening flatness of the end part of the steel rail; and finally, the walking beam is lifted, and the steel rail is lifted along with the walking beam and is separated from the clamp.
Further, the method comprises the following steps: the box is arranged on one side of the static beam corresponding to the highest temperature position of the steel rail, each steel rail is provided with at least two steel clamping devices for improving the straightness of the end part of the steel rail before straightening, and the clamp is clamped at the joint of the rail head and the rail web of the steel rail.
Specifically, the method comprises the following steps: the time that the checkpost blocked the rail is 15 seconds, and the quantity of checkpost is 2 ~ 4, and the checkpost is located the position of first branch steel and the second branch steel after reverse preflex is accomplished on the checkpost cooling bed.
The method for improving the straightness of the end part of the steel rail before straightening has the beneficial effects that: the reverse pre-bending effect of the pre-bending line of the steel rail is strengthened, the front straightening straightness of the front end of the steel rail is improved, the abrasion loss of the straightening ring is reduced, and meanwhile, the upward bending of the front end of the steel rail after being straightened can be reduced, so that the time spent on pressure compensation is reduced. The clip is clamped at the joint of the railhead and the rail web of the steel rail, the required clip is low in height, and the effect is more reliable. The clip is positioned at the positions of the first branch steel and the second branch steel after the reverse pre-bending is finished on the clip cooling bed, the temperature of the first branch steel is highest, but the retention time is shorter; the second branch steel has slightly low temperature but long retention time, and completely meets the requirement of reverse pre-bending and shaping.
Drawings
FIG. 1 is a schematic view of the steel clamping device for improving the pre-straightening flatness of the end of a steel rail and the steel rail.
Reference numerals: the box comprises a box 1, a clamp 2, a screw 3 and a steel rail 4.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1, a first subject of the present invention is a steel clamping device for improving the straightening straightness of a rail end, comprising a box 1 and a clip 2, wherein the top of the box 1 is provided with one or more mounting grooves, the clip 2 is at least one and columnar, the lower part of the clip 2 is assembled in the mounting groove, and the upper part of the clip 2 is positioned outside the mounting groove. The box 1 serves to receive and support the lower end of the clip 2, and the mounting groove is preferably vertical.
When the top of the box 1 is provided with an installation groove, the clip 2 is one. When box 1's top set up a plurality of mounting grooves, the size of each mounting groove is the best unanimous, and each mounting groove equidistant arranges and the central line is parallel to each other, and checkpost 2 can be one this moment or unanimous with the quantity of mounting groove. The lower extreme of checkpost 2 can be fixed in the mounting groove, perhaps the lower extreme card of checkpost 2 is in the mounting groove, is convenient for extract the mounting groove with the checkpost and places in other mounting grooves.
Can directly set up the mounting groove in box 1, the mounting groove sets up in the box body promptly. Or, box 1 includes front bezel and back plate, and the interval sets up two at least fixture blocks between front bezel and the back plate, forms the mounting groove between the fixture block, and welded fastening perhaps fixes through screw 3 between fixture block and box 1's front bezel and/or the back plate. Or, set up the spout in the box 1 again, place two fixture blocks in the spout, the fixture block can slide along the spout, forms a mounting groove between two fixture blocks, and the lower extreme of checkpost 2 is placed in the mounting groove, and the both ends of spout set up at least two respectively with fixture block complex puller bolt. Adjust the puller bolt, not only can make the fixture block with the lower extreme chucking of checkpost 2, can also adjust the position of checkpost 2 in the spout.
The second subject of the invention is: improve card steel construction of straightness before steel rail tip is rectified, see fig. 1, including cold bed, rail 4 and above-mentioned card steel device of improving straightness before steel rail tip is rectified, the cold bed includes quiet roof beam and walking beam, and the walking beam is the walking beam. The box 1 is fixedly arranged on the side surface of the static beam, the top surface of the box 1 is flush with or lower than the top surface of the static beam, for example, the top surface of the box 1 is 5mm lower than the top surface of the static beam. The height at 2 tops of checkpost is less than the biggest lifting height of walking beam, and walking beam can cross the checkpost and accomplish and send rail 4 forward, avoids appearing the problem that rail 4 can't transport forward. For example, the height of the top of the clip 2 relative to the top surface of the static beam is 10-15 mm larger than the half width of the head of the steel rail 4. The steel rail 4 is reversely pre-bent and placed on a cooling bed, and the top of the clamp 2 is clamped at the joint of the rail head and the rail web or the joint of the rail web and the rail bottom of the steel rail 4. Because the relative height of the joint of the railhead and the rail web is lower, and the required height of the clip 2 is lower, the joint of the railhead and the rail web is more beneficial to the clip 2 to clamp the steel rail 4, and the stress is more reliable.
The third subject of the invention is: the method for improving the straightness of the end part of the steel rail before straightening comprises the steps that after the steel rail 4 is finally rolled on a cooling bed, firstly, a pre-bending trolley carries out reverse pre-bending on the steel rail 4. Then, the steel rail 4 is clamped through any steel clamping structure which improves the straightening flatness of the end part of the steel rail. Wherein, box 1 is installed in the one side of the quiet roof beam that 4 temperature highest points of rail correspond, and every rail 4 sets up the card steel device of any preceding straightness that improves of rail tip, and every rail 4 sets up promptly and blocks through at least two checkposts 2. The quantity of checkpost 2 is 2 ~ 4 generally, and the one end of every rail 4 sets up 2 ~ 4 checkposts 2 promptly. After the quantity of checkpost 2 exceeded 4, the improvement effect of straightness before straightening of improvement rail tip is not obvious to the increase of checkpost 2 quantity. The clip 2 is preferably clipped to the head-web joint of the rail 4. Finally, the walking beam is lifted and the rail 4 is lifted with the walking beam and disengaged from the catch 2.
The longer the time that checkpost 2 blocked rail 4, the longer the fixed time of checkpost 2 to rail 4 promptly, reverse preflex effect is better, considers production rhythm and fixed effect, and the time that checkpost 2 blocked rail 4 can be 15 seconds. In order to reduce the magnitude of the holding force of the clip 2, the clip 2 is preferably placed at a position corresponding to the highest temperature of the rail 4 on the cooling bed. Based on the consideration of the time for fixing the steel rail 4 by the clips 2 and the magnitude of the fixing force, the positions of the first branch steel and the second branch steel after the reverse pre-bending is finished on the cooling bed can be placed by combining the conveying process of the steel rail 4 on the cooling bed, namely the positions of the first step and the second step of the steel rail 4 walking are placed on the cooling bed. The first branch steel has the highest temperature, but the residence time is shorter; the second branch steel has slightly low temperature but long retention time, and completely meets the requirement of reverse pre-bending and shaping.
The test was carried out using 60kg/m U75 model 75V steel rail, according to the method described above for improving the pre-straightening flatness of the rail ends. Wherein, the thickness of the clip 2 is 20mm, the width is 60mm, and the material of the clip 2 is a common steel plate. The clamp 2 is arranged at the position of the first branch steel and the position of the second branch steel of the cooling bed, the height of the clamp 2 is 30mm higher than the top surface of the static beam, the number of the clamps 2 is four, and the distance is 500 mm; the clips 2 are clamped at the rail web-rail bottom joint of the steel rail 4, the clips 2 are 30mm higher than the top surface of the static beam, and each clip 2 can be adjusted by a puller bolt to transversely move 100mm left and right. The time for the clip 2 to clamp the rail 4 is 15 s. The lifting height of the movable beam is 100 mm.
The steel rail treated according to the method for improving the straightness of the end part of the steel rail before straightening is straightened by a straightening machine, the straightening reduction of the straightening machine is normally set, the 2# horizontal roll reduction is 18.9mm, the 4# horizontal roll reduction is 13.4mm, the 6# horizontal roll reduction is 7.1mm, and the 8# horizontal roll reduction is 0 mm. And in the straightening stage, a mechanical system is not abnormal, and the rolling process is not required to be adjusted.
After straightening, measuring the bending degree of the steel rail according to iron marks in sections, namely, 1.6-3.1 m is taken as a first section, 2.6-4.1 m is taken as a second section, the standard of the first section is that the upward bending is less than or equal to 0.6mm, the downward bending is less than or equal to 0.2mm, and the upward bending is less than or equal to 0.5mm of the second section. The quality of the rail after the straightening by the straightener was checked and measured by a 1.5m flat bar, and the straightness of the front end of the rail after the straightening was as shown in table 1.
TABLE 1 Steel Rail front end flatness test data after straightening
Comparing the data in the table 1 with the existing industry standard, the specifications of the steel rail head deviation, the crown shape and the like after the straightening machine is straightened are all in the control standard. From experimental data, it can be found that the increased steel clamping device can effectively limit the rebound of the steel rail caused by elasticity and internal bending stress, and the straightness before the steel rail end is straightened is effectively improved after the steel rail is limited by rebound.
Claims (10)
1. Improve card steel device of straightness before rail tip is rectified, its characterized in that: including box (1) and checkpost (2), the top of box (1) sets up one or more mounting grooves, and checkpost (2) are at least one and be the column, and the lower part of checkpost (2) assembles in the mounting groove, and the upper portion of checkpost (2) is located outside the mounting groove.
2. A clip device for improving the pre-straightening flatness of a rail end portion as claimed in claim 1, wherein: the top of the box (1) is provided with a plurality of mounting grooves, the mounting grooves are uniform in size, the mounting grooves are arranged at equal intervals, and the center lines of the mounting grooves are parallel to each other.
3. A clip device for improving the pre-straightening flatness of a rail end portion as claimed in claim 2, wherein: a plurality of clamping blocks are arranged in the box (1) at intervals, mounting grooves are formed between the clamping blocks, and the clamping blocks and the box (1) are fixed through welding or screws (3).
4. A clip device for improving the pre-straightening flatness of a rail end portion as claimed in claim 1, wherein: a sliding groove is formed in the box (1), two clamping blocks are placed in the sliding groove, a mounting groove is formed between the two clamping blocks, and at least two jacking bolts matched with the clamping blocks are arranged at two ends of the sliding groove respectively.
5. A steel clamping device for improving the pre-straightening flatness of the end part of a steel rail as claimed in any one of claims 1 to 4, wherein: the box (1) is made of a steel plate, and the clips (2) are steel bars and are quadrangular; the outer contour of the box (1) is cuboid, the length is 150mm, the height is 50mm, the depth is 100mm, and the height of the clip (2) is 150 mm.
6. Improve card steel construction of straightness before rail tip is rectified, its characterized in that: the steel clamping device for improving the straightening front flatness of the end part of the steel rail comprises a cooling bed, the steel rail (4) and any one of claims 1 to 5, wherein the cooling bed comprises a static beam and a walking beam, the box (1) is fixedly arranged on the side surface of the static beam, the top surface of the box (1) is flush with or lower than the top surface of the static beam, and the top of the clamp (2) is lower than the maximum lifting height of the walking beam; the steel rail (4) is reversely pre-bent and placed on a cooling bed, and the top of the clamp (2) is clamped at the joint of the rail head and the rail web or the joint of the rail web and the rail bottom of the steel rail (4).
7. A clip steel structure for improving the pre-straightening flatness of a rail end portion as claimed in claim 6, wherein: the height of the top of the clip (2) relative to the top surface of the static beam is 10-15 mm larger than half of the width of the head of the steel rail (4).
8. The method for improving the straightness of the end part of the steel rail before straightening is characterized by comprising the following steps of: after the steel rail (4) is finally rolled on the cooling bed, firstly, the pre-bending trolley carries out reverse pre-bending on the steel rail (4); then, the steel rail (4) is clamped through the steel clamping structure for improving the straightening straightness of the end part of the steel rail according to the claim 6 or the claim 7; finally, the walking beam is lifted, and the steel rail (4) is lifted along with the walking beam and is separated from the clamp (2).
9. A method of improving the pre-straightening flatness of a rail end portion according to claim 8, in which: the box (1) is arranged on one side of the static beam corresponding to the highest temperature position of the steel rail (4), each steel rail (4) is provided with at least two steel clamping devices for improving the straightness of the end part of the steel rail before straightening, and the clamp (2) is clamped at the joint of the rail head and the rail web of the steel rail (4).
10. A method of improving the pre-straightening flatness of a rail end portion according to claim 9, in which: the time that checkpost (2) blocked rail (4) is 15 seconds, and the quantity of checkpost (2) is 2 ~ 4, and checkpost (2) are located the position of first branch steel and the second branch steel after reverse preflex is accomplished on checkpost (2) cold bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011615170.2A CN112756442A (en) | 2020-12-30 | 2020-12-30 | Steel clamping device, steel clamping structure and method for improving pre-straightening flatness of end part of steel rail |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011615170.2A CN112756442A (en) | 2020-12-30 | 2020-12-30 | Steel clamping device, steel clamping structure and method for improving pre-straightening flatness of end part of steel rail |
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| CN112756442A true CN112756442A (en) | 2021-05-07 |
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| CN202011615170.2A Pending CN112756442A (en) | 2020-12-30 | 2020-12-30 | Steel clamping device, steel clamping structure and method for improving pre-straightening flatness of end part of steel rail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220396223A1 (en) * | 2019-11-07 | 2022-12-15 | Auto-Kabel Management Gmbh | Power cable for motor vehicles and a method for bending a power cable for motor vehicles |
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2020
- 2020-12-30 CN CN202011615170.2A patent/CN112756442A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220396223A1 (en) * | 2019-11-07 | 2022-12-15 | Auto-Kabel Management Gmbh | Power cable for motor vehicles and a method for bending a power cable for motor vehicles |
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