CN110883138A - Method for correcting low joint of steel rail - Google Patents
Method for correcting low joint of steel rail Download PDFInfo
- Publication number
- CN110883138A CN110883138A CN201911126998.9A CN201911126998A CN110883138A CN 110883138 A CN110883138 A CN 110883138A CN 201911126998 A CN201911126998 A CN 201911126998A CN 110883138 A CN110883138 A CN 110883138A
- Authority
- CN
- China
- Prior art keywords
- rail
- steel rail
- wedge
- correcting
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments
Abstract
The invention discloses a method for correcting a low joint of a steel rail, belongs to the field of railway facilities, and aims to solve the technical problem that cracks are easily generated when cold correction is carried out on a welded joint in the existing correcting method. The method for correcting the low joint of the steel rail comprises the following steps: heating the steel rail low joint to make the temperature reach about 690-710 ℃, and installing the correcting equipment on the steel rail; shaking the hydraulic jack to enable the wedge to slide in the horizontal square hole, and then jacking up the wedge; when the steel rail is straightened to the required degree, the hydraulic jack is taken down, the steel rail is slowly cooled, and the straightening equipment is unloaded when the temperature is reduced to about 200 ℃, so that the straightening is completed. The method is particularly suitable for correcting the low joint in field construction. The method has the advantages of saving materials and manpower, being simple to operate, meeting railway standards and the like.
Description
Technical Field
The invention belongs to the field of railway facilities, and particularly relates to a method for correcting a low joint of a steel rail.
Background
The rail welded joint is the weakest link of circuit, and the welding low joint is the common disease of circuit, can produce great impact force when the train passes through the welding low joint, and the vibrations and the impact force of production are bigger than other positions, consequently make welded joint's track destroy to be faster than other positions for the ballast bed deformation of welded joint department, directly can influence the circuit quality, bring very big harm for the train operation. The factors that cause welding of low joints are mainly: the reserved amount of the rail is too low before welding, excessive grinding is performed during grinding, and the stress and the line condition at high temperature after welding are poor, and the straightness of the low joint is generally between-0.05 mm and-0.20 mm and the maximum of the low joints of-0.1 mm according to the data analysis after field construction statistics. The iron mark TB/T1632-2014 requires that the aluminothermic welding joint is less than 0.1mm, and the flash welding joint and the gas pressure welding joint are low joints when the thickness is less than 0 mm.
Usually, a welding head is processed by grinding, correcting and inserting the short rail, but the grinding and correcting belong to the defect of excessive grinding beyond the range, the requirement of the iron standard TB/T1632-.
Most of the existing straightening equipment is designed in an asymmetric mode, and the steel rail after being straightened has the phenomenon that the front and the back of a welded joint are different in height; the existing correction equipment only heats two sides of a welding joint, and the welding joint is in a low-temperature state and may influence the strength of the welding joint; the existing equipment does not limit the correction amount, and under the condition of manual control, excessive correction is easy to generate, and even a welding joint is damaged.
Disclosure of Invention
The invention aims to provide a method for correcting a low joint of a steel rail, which aims to solve the technical problem that cracks are easy to generate when cold correction is carried out on a welded joint in the existing correcting method.
The technical scheme of the invention is as follows: a method for straightening a low joint of a steel rail comprises the following steps:
A. heating the steel rail low joint to make the temperature reach about 690-710 ℃, and installing the correcting equipment on the steel rail;
B. the hydraulic jack is shaken to enable the wedge to slide in the horizontal square hole, then the wedge is jacked up,
C. when the steel rail is corrected to a required degree, the hydraulic jack is taken down, the steel rail is slowly cooled, and the correcting equipment is unloaded when the temperature is reduced to about 200 ℃, so that the correction is completed;
the correcting equipment in the step A comprises a correcting equipment main body, a wedge block and a wedge, wherein the correcting equipment main body is C-shaped, a vertical hole is longitudinally formed in the bottom of the correcting equipment main body, a horizontal square hole is formed in the horizontal direction, the vertical hole is communicated with the horizontal square hole, the wedge block is arranged in the vertical hole and in clearance fit with the vertical hole, the wedge block is located in the horizontal square hole, a plug board of the wedge block is inserted into the bottom of the wedge block and is attached to an inclined plane at the bottom of the wedge block, and the wedge block slides back and forth in the horizontal square hole.
Furthermore, an arc recess with the depth of 0.6mm is arranged at the contact part of the straightening device main body and the top surface of the steel rail and used for limiting the bending amount of the steel rail.
And further, the heating mode in the step A is that the joint of the rail top and the rail bottom and the rail web of the steel rail is heated, in order to enable the steel rail to be heated more uniformly, the heating is sequentially circulated at the rail bottom of the steel rail, the triangular area, the rail web, the rail head, the rail web, the triangular area and the rail bottom of the steel rail, the rail temperature of each part is observed according to an infrared thermometer, and the heating time is 3-4 minutes.
The low joint correcting equipment for the steel rail has the following characteristics:
1. the correction equipment uses a wedge-shaped jacking structure, the maximum acting force of the power equipment is reduced, the size of the power equipment is reduced, and the portability of the whole equipment is improved.
2. The whole size of the correction device is small, the weight is light, and the correction device is suitable for various complex conditions under the line condition.
3. And more particularly to low joint correction in field operations. The method has the advantages of saving materials and manpower, being simple to operate, meeting railway standards and the like.
4. The present invention utilizes wedge jacking principle to amplify the force of hydraulic jack to the bottom of steel rail and makes the joint part of steel rail produce upward bending deformation so as to reach the aim of correcting low joint.
Drawings
FIG. 1 is a schematic view of a rail low joint straightening device;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic structural view of a rectification apparatus body in the steel rail low joint rectification apparatus;
FIG. 4 is a schematic view of a wedge block for use in a rail low end joint straightening device;
FIG. 5 is a schematic view of a wedge in a rail low joint straightening device;
FIG. 6 is a schematic view of the mounting plate of the rail low end joint straightening device;
FIG. 7 is a schematic view of a rail low splice correction device engaged with a rail.
1-a corrective device body; 11-vertical holes; 12-horizontal square holes; 2-wedge block; 21-inclined plane; 3-a wedge; 31-inserting plate; 4-mounting a plate; 5-steel rail; 6-hydraulic jack; 7-arc concave.
Detailed Description
The invention is further illustrated by the following figures and examples.
A method for straightening a low joint of a steel rail comprises the following steps:
A. heating the steel rail low joint to enable the temperature to reach about 690-710 ℃, and installing the correcting equipment on the steel rail (5); B. c, when the steel rail is corrected to a required degree, the hydraulic jack is taken down, the steel rail is slowly cooled, and when the temperature is reduced to about 200 ℃, correction equipment is unloaded, so that correction is completed; the correcting equipment in the step A comprises a correcting equipment main body 1, a wedge block 2 and a wedge 3, wherein the correcting equipment main body 1 is C-shaped, a vertical hole 11 is longitudinally formed in the bottom of the correcting equipment main body 1, a horizontal square hole 12 is formed in the horizontal direction, the vertical hole 11 is communicated with the horizontal square hole 12, the wedge block 2 is arranged in the vertical hole 11 and is in clearance fit with the vertical hole, the wedge 3 is located in the horizontal square hole 12, an inserting plate 31 of the wedge 3 is inserted into the bottom of the wedge block 2 and is attached to an inclined plane 21 at the bottom of the wedge block 2, and the wedge 3 slides back and forth in the horizontal square hole 12; the rear end of the wedge 3 is connected with a hydraulic jack 6. An arc recess 7 with the depth of 0.6mm is arranged at the contact part of the straightening device body 1 and the top surface of the steel rail 5 and is used for limiting the bending amount of the steel rail.
Example 1
The mounting plate is used for connecting the power equipment with the whole body and inputting power.
The heating device comprises an oxygen cylinder, a propane cylinder, an oxygen meter, a propane meter, a heating spray gun, an air pipe and the like,
heating the welding seam of the steel rail to enable the full profile of the welding seam to be at about 700 ℃, and reducing the yield strength and the elastic modulus of the steel rail.
The hydraulic jack adopts a 3T hydraulic jack. The rear end of the bottom of the correction equipment main body 1 is connected with a mounting plate 4 through bolts, and a hydraulic jack 6 is arranged in the mounting plate 4. The slope of the inclined surface 21 at the bottom of the wedge block 2 is 22: 1. The length of the wedge 2 is 110mm, and the height difference between the front side and the rear side is 5 mm. The inclination of the front half of the inserting plate 31 is 22: 1.
The specific process is as follows: and heating the full section of the steel rail welding seam by using the heating part to ensure that the temperature reaches about 700 ℃, quickly withdrawing the heating part, and clamping the assembled correction equipment in the center of the steel rail welding seam. A hydraulic jack 6 is placed in the mounting plate 4, the acting force of a jack rod of the hydraulic jack is applied to the tail part of the wedge 3, the wedge 3 slides along the horizontal square hole 12, the wedge 3 interacts with the contact surface of the wedge 2 to lift the wedge 2, the correcting force is applied to the bottom of the steel rail, the part pressed on the steel rail applies downward force to the two ends of the welding seam, and the steel rail is corrected by the resultant force of the three forces; and when the hydraulic jack reaches the maximum force, taking down the hydraulic jack, waiting for the cooling of the steel rail, pulling out the wedge 3 by using the wedge pull rod, and taking down the correction equipment to finish correction. The invention utilizes the straightening equipment to perform stress-applying straightening and springback prevention in the cooling process of the low joint of the steel rail.
The heating mode is that the joint of the rail top and the rail bottom web of the steel rail is heated, in order to enable the steel rail to be heated more uniformly, the heating is sequentially circulated in the rail bottom-triangular area-rail web-railhead-rail web-triangular area-steel rail bottom, the rail temperature of each part is observed according to an infrared thermometer, and the heating time is 3-4 minutes.
Claims (3)
1. A method for correcting a low joint of a steel rail is characterized by comprising the following steps:
A. heating the steel rail low joint to enable the temperature to reach about 690-710 ℃, and installing the correcting equipment on the steel rail (5);
B. shaking the hydraulic jack to enable the wedge to slide in the horizontal square hole, and then jacking up the wedge;
C. when the steel rail is corrected to a required degree, the hydraulic jack is taken down, the steel rail is slowly cooled, and the correcting equipment is unloaded when the temperature is reduced to about 200 ℃, so that the correction is completed;
the correcting equipment in the step A comprises a correcting equipment main body (1), a wedge block (2) and an inclined wedge (3), wherein the correcting equipment main body (1) is C-shaped, a vertical hole (11) is longitudinally formed in the bottom of the correcting equipment main body (1), a horizontal square hole (12) is formed in the horizontal direction, the vertical hole (11) is communicated with the horizontal square hole (12), the wedge block (2) is located in the vertical hole (11) in a clearance fit mode, the inclined wedge (3) is located in the horizontal square hole (12), an inserting plate (31) of the inclined wedge (3) is inserted into the bottom of the wedge block (2) and is attached to an inclined plane (21) at the bottom of the wedge block (2), and the inclined wedge (3) slides back and forth in the horizontal square hole (12).
2. A method of straightening a rail low joint according to claim 1, characterized in that: an arc recess (7) with the depth of 0.6mm is arranged at the contact part of the main body (1) of the straightening device and the top surface of the steel rail (5) and is used for limiting the bending amount of the steel rail.
3. A method of straightening a rail low joint according to claim 1, characterized in that: and the heating mode of the step A is that the joint of the rail top and the rail bottom web of the steel rail is heated, in order to enable the steel rail to be heated more uniformly, the heating is sequentially circulated at the rail bottom of the steel rail, the triangular area, the rail web, the rail head, the rail web, the triangular area and the rail bottom of the steel rail, the rail temperature of each part is observed according to an infrared thermometer, and the heating time is 3-4 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911126998.9A CN110883138B (en) | 2019-11-18 | 2019-11-18 | Method for correcting low joint of steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911126998.9A CN110883138B (en) | 2019-11-18 | 2019-11-18 | Method for correcting low joint of steel rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110883138A true CN110883138A (en) | 2020-03-17 |
| CN110883138B CN110883138B (en) | 2021-08-31 |
Family
ID=69747804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911126998.9A Active CN110883138B (en) | 2019-11-18 | 2019-11-18 | Method for correcting low joint of steel rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110883138B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877990A (en) * | 2021-09-29 | 2022-01-04 | 江苏龙城精锻集团有限公司 | High-temperature shaping process and die for 304 stainless steel oil rail with large length-diameter ratio |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201950097U (en) * | 2010-12-21 | 2011-08-31 | 中国二十二冶集团有限公司 | Self-made electrolytic cell cathode steel bar straightening machine |
| CN202377316U (en) * | 2011-12-01 | 2012-08-15 | 中国重型机械研究院有限公司 | Bar straightening machine pressing mechanism |
| CN202416102U (en) * | 2011-07-22 | 2012-09-05 | 西南交通大学 | Vertical straightening machine of rail base clamping movable type steel rail welded joints |
| CN103624113A (en) * | 2013-11-14 | 2014-03-12 | 张家港市张运机械制造有限公司 | Elevator guide rail straightening machine |
| CN203599296U (en) * | 2013-11-05 | 2014-05-21 | 张佳明 | T-type guide rail straightening mechanism of full-automatic straightening machine |
| JP3215205U (en) * | 2017-11-15 | 2018-03-08 | 運華 李 | Hydraulic straightener for shaft parts |
-
2019
- 2019-11-18 CN CN201911126998.9A patent/CN110883138B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201950097U (en) * | 2010-12-21 | 2011-08-31 | 中国二十二冶集团有限公司 | Self-made electrolytic cell cathode steel bar straightening machine |
| CN202416102U (en) * | 2011-07-22 | 2012-09-05 | 西南交通大学 | Vertical straightening machine of rail base clamping movable type steel rail welded joints |
| CN202377316U (en) * | 2011-12-01 | 2012-08-15 | 中国重型机械研究院有限公司 | Bar straightening machine pressing mechanism |
| CN203599296U (en) * | 2013-11-05 | 2014-05-21 | 张佳明 | T-type guide rail straightening mechanism of full-automatic straightening machine |
| CN103624113A (en) * | 2013-11-14 | 2014-03-12 | 张家港市张运机械制造有限公司 | Elevator guide rail straightening machine |
| JP3215205U (en) * | 2017-11-15 | 2018-03-08 | 運華 李 | Hydraulic straightener for shaft parts |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877990A (en) * | 2021-09-29 | 2022-01-04 | 江苏龙城精锻集团有限公司 | High-temperature shaping process and die for 304 stainless steel oil rail with large length-diameter ratio |
| CN113877990B (en) * | 2021-09-29 | 2024-04-05 | 江苏龙城精锻集团有限公司 | High-temperature shaping process and die for 304 stainless steel oil rail with large length-diameter ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110883138B (en) | 2021-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105397369B (en) | A kind of steel box-girder top plate unit part welding anti-distortion technique | |
| CN110883138B (en) | Method for correcting low joint of steel rail | |
| CN201685073U (en) | Backing plate device | |
| CN207104168U (en) | The welding tooling of car engine suspension | |
| CN211707773U (en) | Steel rail low joint correcting equipment | |
| CN104560067A (en) | Furnace stay fixing device used for replacing coke oven cross brace | |
| CN211248766U (en) | APM chassis friction stir welding frock | |
| JP6723857B2 (en) | Rail repair section correction method, rail correction method, and rail repair section correction apparatus | |
| US20080230520A1 (en) | Method For Welding Two Rails of a Track | |
| US11919108B2 (en) | Automated geometry and crowning apparatus for use of mobile electric flash-butt welding of railroad rails and rail inserts | |
| CN107790910A (en) | A kind of multiple construction method of permanent weldering for gas-pressure weld rail vehicle | |
| CN108340069B (en) | Prestress clamp for preventing workpiece deformation based on friction stir welding | |
| CN212384323U (en) | Aluminum alloy city rail car headwall leveling auxiliary device | |
| CN106553011A (en) | A kind of efficient automobile door-plate welder | |
| CN202416102U (en) | Vertical straightening machine of rail base clamping movable type steel rail welded joints | |
| CN219562042U (en) | Semi-automatic assembling clamp for cold box pipeline cylindrical shell section | |
| CN213671179U (en) | Box member main weld angle deformation adjusting device | |
| CN205764626U (en) | Prevent the fitting device that longitudinal seam welding of barrel deforms | |
| CN110711797B (en) | Application method of correcting device for warp deformation of cross-shaped frame beam assembly | |
| CN202169467U (en) | Detecting and correcting device for roundness of pivoting bearing gear ring | |
| CN110091031A (en) | A kind of H profile steel angular deformation control device and method based on full penetration submerged-arc welding | |
| CN206273415U (en) | The case component of the Special forming machine of automotive seat angular adjustment component | |
| CN213661058U (en) | Correcting device for middle steel wheel of paying-off tackle | |
| CN114164337B (en) | Quenching process of I-shaped ultra-light switch rail with reversible deformation effect | |
| CN218363101U (en) | Welding tool for bogie draw beam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |