CN114453425A - Double-side roll-changing continuous pipe rolling mill device adopting top positioning - Google Patents
Double-side roll-changing continuous pipe rolling mill device adopting top positioning Download PDFInfo
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- CN114453425A CN114453425A CN202111671754.6A CN202111671754A CN114453425A CN 114453425 A CN114453425 A CN 114453425A CN 202111671754 A CN202111671754 A CN 202111671754A CN 114453425 A CN114453425 A CN 114453425A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 80
- 230000005540 biological transmission Effects 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 abstract description 15
- 230000007547 defect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009785 tube rolling Methods 0.000 description 2
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
- B21B31/12—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by vertically displacing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a double-side roll-changing continuous pipe rolling mill device adopting top positioning, which comprises: the device comprises a machine base, a roller frame and a roller changing device. The stand is provided with a theoretical rolling central line; the roll stands are arranged on the stand at intervals and are provided with roll stand center lines, and the roll stand center lines are superposed with theoretical rolling center lines; the roll changing devices are arranged on two sides of the machine base and can move the roll stands positioned at odd numbers to one side of the machine base and move the roll stands positioned at even numbers to the other side; each roll stand is provided with three rolls; the corresponding position of frame is equipped with three transmission shafts of telescopic, and the transmission shaft can drive the roll respectively, and one of three transmission shaft is the top transmission shaft, and the top transmission shaft sets up and can drive horizontal roll rotation along vertical direction, and all the other two transmission shafts become 120 degrees arrangements and in the coplanar with the top transmission shaft respectively. The device solves the defect of swinging of the pressing cylinder, can also replace the roll stand freely and independently, and overcomes the defect of slow roll replacement.
Description
Technical Field
The invention relates to the technical field of steel pipe production, in particular to a bilateral roll-changing continuous pipe rolling machine device adopting top positioning.
Background
The continuous rolling mill is an industrial mechanical continuous rolling mill and can be used for rolling steel strips, producing seamless steel tubes and the like. A continuous rolling mill generally consists of a main stand, a plurality of roll stands, a plurality of mandrel holders and a roll changer. The roll changing device is used for pushing the roll stand or the mandrel support frame to a preset position on the main machine base or pulling the roll stand or the mandrel support frame out of the main machine base to the preset position, so that the roll stand or the mandrel support frame can be conveniently replaced.
In the prior art, the continuous tube rolling mill for producing steel tubes has the following disadvantages:
when one roll stand on a stand needs to be maintained or replaced, the roll stand cannot be replaced independently, the roll replacing efficiency is low, and the production efficiency is seriously influenced;
the pressing cylinder corresponding to the roller on the stand is installed in a swinging mode, so that although one of the roller stands can be independently replaced, in long-term use, the swinging shaft and the shaft sleeve are abraded due to the rolling force, the finished product of the wall thickness of the steel pipe (within the range of 120 degrees) on the side is poor, the manufacturing precision of the steel pipe is influenced, even a large amount of waste products can be generated, and the manufacturing cost is increased;
the roll stands on the stand are installed in a bottom positioning mode, and the sliding plates at the bottoms of the roll stands and the sliding plates of the roll changing device are seriously abraded, so that the central lines of the roll stands are not in a straight line, the positioning precision is influenced, and finally, the wall thickness of a rolled steel pipe is uneven, and the quality of the steel pipe is influenced.
Disclosure of Invention
In order to solve part or all of the technical problems in the prior art, the invention provides a double-side roll-changing continuous pipe rolling mill device adopting top positioning.
The technical scheme of the invention is as follows:
a double-sided roll-change tandem mill apparatus employing top positioning, the apparatus comprising:
a stand capable of receiving a steel tube delivered in a mill feed direction, the stand having a theoretical rolling centerline for positioning the steel tube;
the rolling stand is sequentially arranged on the stand at intervals along the feeding direction of the rolling mill, and is provided with a rolling stand central line for positioning a steel pipe, and the rolling stand central line is superposed with the theoretical rolling central line;
the roll changing devices are arranged on two sides of the machine base and can move the roll racks at odd number positions to one side of the machine base and can also move the roll racks at even number positions to the other side of the machine base;
the rolling machine comprises a rolling machine frame, a rolling machine frame and a rolling machine, wherein the rolling machine frame is provided with three rollers, the three rollers are arranged at intervals along the circumferential direction around the central line of the rolling machine frame, and the angle between every two adjacent rollers is 120 degrees; the stand is provided with three transmission shafts corresponding to each rolling stand, the three transmission shafts are arranged at intervals along the circumferential direction around the theoretical rolling central line and respectively correspond to the three rollers, the three transmission shafts can be stretched along the respective axial direction and can output rotary driving force, and each transmission shaft can respectively drive the roller corresponding to each transmission shaft to rotate; one of the three rollers is a horizontal roller, the horizontal roller is arranged along the horizontal direction, the rotating central axis of the horizontal roller extends along the vertical direction, one of the three transmission shafts is a top transmission shaft, the top transmission shaft is arranged along the vertical direction and is positioned at the top of the horizontal roller, the top transmission shaft can extend and abut against the horizontal roller to drive the horizontal roller to rotate, and the angle between the top transmission shaft and the other two transmission shafts is 120 degrees.
Optionally, the stand is further fixedly provided with three pressing cylinders corresponding to each rolling stand, the three pressing cylinders are circumferentially spaced around the theoretical rolling center line, the three pressing cylinders respectively correspond to the three rollers, and each pressing cylinder can extend and abut against the corresponding roller, so that the roller moves toward the theoretical rolling center line.
Optionally, the device further comprises mandrel supports, the mandrel supports are sequentially arranged on the stand at intervals along the feeding direction of the rolling mill, each mandrel support is provided with a mandrel support center line for positioning a mandrel, and the mandrel support center line is overlapped with the theoretical rolling center line;
the roll changer can move the mandrel bar supports located at odd-numbered positions to one side of the machine base, and can also move the mandrel bar supports located at even-numbered positions to the other side of the machine base.
Optionally, the roll changing device has a guide rail extending perpendicular to the feeding direction of the rolling mill, and the bottom of the roll stand and the bottom of the mandrel support frame are both provided with pulleys capable of sliding on the guide rail, so that the roll stand and the mandrel support frame can move along the guide rail.
Optionally, a lifting cylinder is arranged on the inner side of the guide rail, the lifting cylinder can drive the roller frame and the mandrel support frame to move upwards along the vertical direction, positioning blocks are arranged on the top of the roller frame and the top of the mandrel support frame, the machine base is provided with a limiting block corresponding to the positioning blocks,
the positioning block can be matched with the limiting block in the process that the roller frame and the mandrel support frame ascend so as to position the roller frame and the mandrel support frame.
Optionally, the positioning block includes a V-shaped positioning block disposed on one side of a top of each of the roll stand and the mandrel bar support frame, and a planar positioning block disposed on the other side of the top.
The technical scheme of the invention has the following main advantages:
the tandem mill is designed into a structure that the roll stand and the mandrel support frame can be replaced on two sides by adopting the top-positioned double-side roll-changing tandem mill device, so that the roll stand can be replaced independently at will, and the defect of slow roll change is overcome; the rolling mill is characterized in that the rolling mill frame is supported to a rolling position by a lifting cylinder before rolling, falls onto a track at the bottom of the mill base during roll changing, and is pulled out by a roll changing device for changing; in addition, the roller frame is designed to be positioned at the top, so that the V-shaped positioning block and the machine base do not slide relatively, and the positioning plate is never worn. Therefore, the device of the embodiment can ensure the manufacturing precision of the wall thickness of the steel pipe and effectively improve the production efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of a double-sided roll-changing tandem mill apparatus using top positioning according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the roll changing operation of the roll stand located at an odd number of positions in the apparatus shown in FIG. 1;
FIG. 3 is a schematic cross-sectional view of a roll change in a roll stand located at an even number of positions in the apparatus shown in FIG. 1;
FIG. 4 is a schematic view of the roll stand and stand of the apparatus shown in FIG. 1;
FIG. 5 is a schematic cross-sectional view of a core support frame in the apparatus shown in FIG. 1 with a roll change;
FIG. 6 is a schematic view of the roll stand and roll changing apparatus of the apparatus shown in FIG. 1;
FIG. 7 is a schematic structural view of a mandrel holder and a roll changer in the apparatus shown in FIG. 1;
description of reference numerals:
10: the engine base 11: the transmission shaft 12: pressing cylinder
20: the roll stand 21: roll 22: locating block
30: the roll changing device 31: guide rail 40: rod core support frame
51: pulley 52: the lift cylinder 53: v-shaped positioning block
54: and (5) a plane positioning block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 7, in one embodiment according to the present invention, a double-side roll-changing tandem pipe mill apparatus using top positioning is provided, which is capable of individually changing a roll stand and a mandrel bar support frame at both sides of a mill stand, and avoiding interference generated when changing the roll stand and the mandrel bar support frame by properly arranging positions of a transmission shaft and a hold-down cylinder, and simultaneously avoiding wear easily generated during the change of the roll stand and the mandrel bar support frame by the top positioning, effectively ensuring precision of a steel pipe to be rolled, and ensuring production efficiency.
Specifically, as shown in fig. 1 to 3, the apparatus of the present embodiment includes: the device comprises a stand 10, a roller frame 20, a roller changing device 30 and a mandrel support frame 40.
Wherein, the stand 10 can receive the steel tube conveyed along the feeding direction of the rolling mill, the stand 10 has a theoretical rolling central line for positioning the steel tube, the stand 10 is used for supporting the rolling mill stand 20 and the mandrel support frame 40 and bearing the rolling force; the roll stands 20 are sequentially arranged on the stand 10 at intervals along the feeding direction of the rolling mill, the roll stands 20 are provided with roll stand center lines for positioning steel pipes, and the roll stand center lines are superposed with theoretical rolling center lines; the roll changing devices 30 are provided at both sides of the stand 10, and the roll changing devices 30 can move the roll stands 20 located at odd-numbered positions to one side of the stand 10 and can also move the roll stands 20 located at even-numbered positions to the other side of the stand 10.
It can be understood that the steel pipe is conveyed to the stand 10 along the length direction thereof, and the stand 10 makes the central axis of the steel pipe coincide with the theoretical rolling center line when receiving the steel pipe, thereby positioning the steel pipe. The central line of the roll stand 20 also needs to coincide with the central axis of the steel pipe to ensure the rolling accuracy of the steel pipe. The roll changing devices 30 are respectively provided at both sides of the stand 10, and the roll changing devices 30 can move the roll stands 20 located at odd-numbered positions to one side of the stand 10 and the roll stands 20 located at even-numbered positions to the other side of the stand 10 according to the installation order of the roll stands 20.
Further, the roll stand 20 is provided with three rolls 21, the three rolls 21 are circumferentially spaced around the center line of the roll stand, and the angle between adjacent rolls 21 is 120 °; the stand 10 is provided with three transmission shafts 11 corresponding to each roll stand 20, the three transmission shafts 11 are arranged at intervals along the circumferential direction around a theoretical rolling central line, the three transmission shafts 11 respectively correspond to the three rolls 21, the three transmission shafts 11 can extend along respective axial directions and can output rotary driving force, and each transmission shaft 11 can respectively drive the corresponding roll 21 to rotate; one of the three rollers is a horizontal roller, the horizontal roller is arranged along the horizontal direction, and the rotating central axis of the horizontal roller extends along the vertical direction; one of the three transmission shafts 11 is a top transmission shaft which is arranged along the vertical direction and is positioned at the top of the horizontal roller, the top transmission shaft can extend to abut against the horizontal roller so as to drive the horizontal roller to rotate, and the angle between the top transmission shaft and the other two transmission shafts is 120 degrees.
It will be understood that each roll stand 20 has a horizontal roll arranged in a horizontal direction, and the stand 10 is provided with a top drive shaft arranged in a vertical direction, the top drive shaft being capable of driving the horizontal roll to rotate. When rolling a steel pipe, three rolling rolls 21 including horizontal rolling rolls are arranged in the circumferential direction of the steel pipe, and each of the three rolling rolls 21 is capable of rolling the steel pipe by the drive of the respective drive shafts 11.
In order to ensure that the rollers 21 can clamp the steel pipe and solve the problem of the prior art that the wall thickness of the pipe is too poor due to the abrasion of the swing shaft and the shaft sleeve of the reduction cylinder of the roller frame, in the embodiment, the reduction cylinder is designed to be fixed.
Specifically, as shown in fig. 4, the stand 10 in the present embodiment is further fixedly provided with three pressing cylinders 12 corresponding to each roll stand 20, the three pressing cylinders 12 are circumferentially spaced around the theoretical rolling center line, the three pressing cylinders 12 respectively correspond to three rolls 21, and each pressing cylinder 12 can extend and abut against the respective corresponding roll 21 so that the roll 21 moves toward the theoretical rolling center line.
Thus, when the roll stand 20 is laterally pulled out or pushed in, a sufficient space can be left for the lateral movement of the roll stand 20 by means of the 120 ° neutral position between the top drive shaft arranged in the vertical direction and the obliquely lower drive shaft adjacent to the roll changing device 30, and simultaneously retracting all the drive shaft 11 and the piston of the hold-down cylinder 12. The structure does not need to swing the pressing cylinder 12, can effectively avoid abrasion errors caused by the movement of the swing shaft of the pressing cylinder 12, and can overcome the problems in the prior art.
Preferably, in order to support the steel pipe, as shown in fig. 5, the apparatus in the present embodiment further includes mandrel supports 40, the mandrel supports 40 are sequentially disposed on the stand 10 at intervals along the feeding direction of the rolling mill, the mandrel supports 40 have a mandrel support center line for positioning the mandrel, and the mandrel support center line coincides with the theoretical rolling center line; the roll changer 30 can move the mandrel bar supports 40 located at the odd-numbered positions to one side of the machine base 10, and can also move the mandrel bar supports 40 located at the even-numbered positions to the other side of the machine base 10.
It will be appreciated that the mandrel support stands 40 move in a similar manner to the roll stand 20 and that the mandrel support stands 40 may be staggered with respect to the roll stand 20.
Further, in order to solve the problem that the bottom sliding plate is abraded to influence the accuracy of the rolling center line due to the bottom positioning and roll changing of the continuous rolling mill roll stand in the prior art, the roll stand is designed to be positioned at the top in the embodiment.
Specifically, as shown in fig. 6 and 7, the roll changer 30 in the present embodiment has a guide rail 31 extending in a direction perpendicular to the feeding direction of the rolling mill, and the bottom of the roll stand 20 and the bottom of the mandrel bar support 40 are each provided with a pulley 51 slidable on the guide rail 31 so that the roll stand 20 and the mandrel bar support 40 can move along the guide rail 31.
In one implementation, a hydraulic cylinder is disposed on one side of the guide rail 31 away from the machine base 10, a piston rod of the hydraulic cylinder can extend and retract towards the machine base 10, a clamping buckle is disposed on an end portion of the piston column, a clamping seat is disposed on one side of the roller frame 20 and the mandrel support frame 40 towards the hydraulic cylinder, the clamping buckle can be clamped to the clamping seat, and when the clamping buckle and the clamping seat are mutually jointed, the hydraulic cylinder is driven to realize lateral movement of the roller frame 20 and the mandrel support frame 40.
In order to realize top positioning, a lifting cylinder 52 is arranged inside the guide rail 31, the lifting cylinder 52 can drive the roller frame 20 and the mandrel support frame 40 to move upwards along the vertical direction, positioning blocks 22 are arranged on the top of the roller frame 20 and the top of the mandrel support frame 40, and the machine base 10 is provided with limiting blocks corresponding to the positioning blocks 22, wherein the positioning blocks 22 can be matched with the limiting blocks in the process that the roller frame 20 and the mandrel support frame 40 ascend to position the roller frame 20 and the mandrel support frame 40.
Therefore, the positioning block 22 at the top does not move relative to the positioning blocks 53 and 54 of the roll stand 20 and the mandrel bar support 40, so that the wear never occurs, the respective positioning accuracy of the roll stand 20 and the mandrel bar support 40 is not affected even if the bottoms of the roll stand 20 and the mandrel bar support 40 are greatly worn, the rolling center lines of the stands can be effectively ensured to be always on the same straight line, and the rolling accuracy of the steel pipe is improved.
In order to achieve more accurate positioning, the positioning block 22 in the present embodiment includes a V-shaped positioning block 53 provided on one side of the top of each of the roll stand 20 and the mandrel bar support frame 40, and a flat positioning block 54 provided on the other side of the top.
In practical use, when the roll stand 20 is pushed into the stand 10 of the continuous rolling mill by the roll changing device 30 and reaches a preset position, the roll stand 20 can be jacked up by the lifting cylinder 52 and positioned by the V-shaped positioning block 53 and the plane positioning block 54, so that the center line of the roll stand is ensured to be coincident with the theoretical rolling center line, accurate positioning can be realized, and the structure is reliable and firm.
Therefore, the double-side roll-changing continuous tube rolling mill device adopting the top positioning in the embodiment has the following advantages:
in the embodiment, the continuous rolling mill is designed into a structure that the roll stand and the mandrel support frame can be replaced on two sides, so that the roll stand can be replaced freely and independently, and the defect of slow roll replacement is overcome; the rolling mill is characterized in that the rolling mill is provided with a rolling mill frame and a mandrel support frame, wherein the rolling mill frame is provided with a rolling mill base, the rolling mill base is provided with a pressing cylinder, the pressing cylinder is fixedly arranged on the rolling mill base, the lifting cylinder is used for jacking the rolling mill frame and the mandrel support frame to a rolling position before rolling, and the rolling mill base falls onto a track at the bottom of the rolling mill base when roll changing is carried out, and is pulled out by a roll changing device for changing; in addition, the roller frame is designed to be positioned at the top, so that the V-shaped positioning block and the machine base do not slide relatively, and the positioning plate is never worn. Therefore, the device of the embodiment can ensure the manufacturing precision of the wall thickness of the steel pipe and effectively improve the production efficiency.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A double-sided roll change continuous tube mill apparatus employing top positioning, the apparatus comprising:
a stand capable of receiving a steel tube delivered in a mill feed direction, the stand having a theoretical rolling centerline for positioning the steel tube;
the rolling stand is sequentially arranged on the stand at intervals along the feeding direction of the rolling mill, and is provided with a rolling stand central line for positioning a steel pipe, and the rolling stand central line is superposed with the theoretical rolling central line;
the roll changing devices are arranged on two sides of the machine base and can move the roll racks at odd number positions to one side of the machine base and can also move the roll racks at even number positions to the other side of the machine base;
the rolling machine comprises a rolling machine frame, a rolling machine frame and a rolling machine, wherein the rolling machine frame is provided with three rollers, the three rollers are arranged at intervals along the circumferential direction around the central line of the rolling machine frame, and the angle between every two adjacent rollers is 120 degrees; the stand is provided with three transmission shafts corresponding to each rolling stand, the three transmission shafts are arranged at intervals along the circumferential direction around the theoretical rolling central line and respectively correspond to the three rollers, the three transmission shafts can be stretched along the respective axial direction and can output rotary driving force, and each transmission shaft can respectively drive the roller corresponding to each transmission shaft to rotate; one of the three rollers is a horizontal roller, the horizontal roller is arranged along the horizontal direction, the rotating central axis of the horizontal roller extends along the vertical direction, one of the three transmission shafts is a top transmission shaft, the top transmission shaft is arranged along the vertical direction and is positioned at the top of the horizontal roller, the top transmission shaft can extend and abut against the horizontal roller to drive the horizontal roller to rotate, and the angle between the top transmission shaft and the other two transmission shafts is 120 degrees.
2. The apparatus of claim 1, wherein said stand is further fixedly provided with three hold-down cylinders for each roll stand, said three hold-down cylinders being circumferentially spaced around said theoretical rolling centerline, said three hold-down cylinders corresponding to three of said rolls respectively, each of said hold-down cylinders being extendable and abuttable to a respective one of said rolls for moving said roll toward said theoretical rolling centerline.
3. The apparatus of claim 1, further comprising mandrel supports sequentially spaced along the mill feed direction on the stand, the mandrel supports having a mandrel support centerline for positioning a mandrel, the mandrel support centerline coinciding with the theoretical rolling centerline;
the roll changer can move the mandrel bar supports located at odd-numbered positions to one side of the machine base, and can also move the mandrel bar supports located at even-numbered positions to the other side of the machine base.
4. The apparatus according to claim 3, characterized in that the roll changing device has a guide rail extending perpendicular to the rolling mill feeding direction, and the bottom of the roll stand and the bottom of the mandrel support frame are each provided with a pulley slidable on the guide rail so that the roll stand and the mandrel support frame can move along the guide rail.
5. The apparatus according to claim 4, wherein a lifting cylinder is provided at an inner side of the guide rail, the lifting cylinder can drive the roll stand and the mandrel bar support frame to move upward in a vertical direction, positioning blocks are provided at a top of the roll stand and a top of the mandrel bar support frame, the stand is provided with a stopper corresponding to the positioning blocks,
the positioning block can be matched with the limiting block in the process that the roller frame and the mandrel support frame ascend so as to position the roller frame and the mandrel support frame.
6. The apparatus of claim 5, wherein the locating blocks comprise a V-shaped locating block disposed on one side of a top portion of each of the roll stand and the mandrel support frame, and a planar locating block disposed on the other side of the top portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111671754.6A CN114453425A (en) | 2021-12-31 | 2021-12-31 | Double-side roll-changing continuous pipe rolling mill device adopting top positioning |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111671754.6A CN114453425A (en) | 2021-12-31 | 2021-12-31 | Double-side roll-changing continuous pipe rolling mill device adopting top positioning |
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| CN114453425A true CN114453425A (en) | 2022-05-10 |
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| CN202111671754.6A Pending CN114453425A (en) | 2021-12-31 | 2021-12-31 | Double-side roll-changing continuous pipe rolling mill device adopting top positioning |
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| CN202174107U (en) * | 2011-07-14 | 2012-03-28 | 中冶赛迪工程技术股份有限公司 | Three-roller pipe continuous mill |
| CN102327899A (en) * | 2011-10-11 | 2012-01-25 | 太原重工股份有限公司 | Mandrel support device of mandrel pipe mill and mandrel pipe mill |
| CN105142812A (en) * | 2013-04-11 | 2015-12-09 | 丹尼尔和科菲森梅克尼齐有限公司 | Three-rolling stand with lateral change |
| CN203565472U (en) * | 2013-12-03 | 2014-04-30 | 中冶赛迪工程技术股份有限公司 | Mandrel supporting device for rolling pipe fitting |
| US20180304327A1 (en) * | 2015-10-23 | 2018-10-25 | Danieli & C. Officine Meccaniche S.P.A. | Multi-stand rolling mill for rod-shaped bodies comprising three motorized-rollers stands |
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