CN216937758U - Large-length seamless tube rolling production line - Google Patents
Large-length seamless tube rolling production line Download PDFInfo
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- CN216937758U CN216937758U CN202220093537.7U CN202220093537U CN216937758U CN 216937758 U CN216937758 U CN 216937758U CN 202220093537 U CN202220093537 U CN 202220093537U CN 216937758 U CN216937758 U CN 216937758U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model discloses a long seamless tube rolling production line, which comprises a rotary discharging frame, a rotary straightening machine, a blank tube feeding device, a seamless tube rolling mill and a rotary collecting frame which are sequentially arranged on a straight line, wherein blanks for rolling seamless tubes are wound on a scroll, the scroll is arranged on the rotary discharging frame, the end head of each blank extends forwards and sequentially passes through the rotary straightening machine and the blank tube feeding device and extends into the seamless tube rolling mill, a mandrel in the seamless tube rolling mill is embedded into a central hole of each blank, a new blank formed by rolling is wound on the scroll of the rotary collecting frame by the seamless tube rolling mill, and the blanks rotate around the axis of the blanks in the process of rolling the blanks into the new blanks. The rolling device is reasonable in layout, realizes the rolling of the reel type seamless pipe through the technological processes of pipe releasing, straightening, cold rolling and coiling, has larger length, directly meets the use requirement of a deep well, and has larger advantage in saving materials in sections; the long seamless pipe has no welding seam interface and stable performance.
Description
Technical Field
The utility model relates to the field of seamless tube rolling equipment, in particular to a rolling production line of a long seamless tube.
Background
The length of a general seamless pipe is not more than 80m, and when the length exceeds 100m, the pipe is called a large length. The conventional seamless tube has limited length, is linear in the whole rolling process, and achieves the functions of reducing the diameter, reducing the thickness and increasing the length by rolling the core rod and an external mechanism. The long seamless steel pipe for the petroleum cable is formed by adopting a welding mode mostly, mainly because the existing seamless pipeline cannot produce continuous seamless rolled pipes due to the influence of the length of a production line and a take-up and pay-off line, the total length of the seamless pipe can be prolonged only by a mode of pipe butt joint, so that the seamless pipe has the defects of uneven weld joint tissues, incapability of eliminating welding stress or other welding defects, the risk of breakage of a weak area at a weld joint exists in the use process of the welded seamless pipe, once the breakage occurs, the whole pipeline needs to be searched and replaced, the period is long, and the cost is high. Therefore, how to develop a continuous production line to realize rolling production of a long seamless tube becomes a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a large-length seamless tube rolling production line, which realizes the realization of a new manufacturing process by synchronously rotating processing equipment for taking up and paying off and straightening so as to achieve the aim of continuously producing stainless steel seamless tubes in large length.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model relates to a long seamless tube rolling production line, which comprises a rotary feeding rack, a rotary straightening machine, a blank tube feeding device, a seamless tube rolling mill and a rotary receiving rack, wherein the rotary feeding rack, the rotary straightening machine, the blank tube feeding device, the seamless tube rolling mill and the rotary receiving rack are sequentially arranged on a straight line, blanks for rolling seamless tubes are wound on a scroll, the scroll is installed on the rotary feeding rack, the end heads of the blanks extend forwards to sequentially pass through the rotary straightening machine and the blank tube feeding device and extend into the seamless tube rolling mill, a mandrel in the seamless tube rolling mill is embedded into a central hole of the blanks, new blanks formed by rolling through the seamless tube rolling mill continue to extend forwards and are wound on the scroll of the rotary receiving rack, and the blanks rotate around the axis of the blanks in the process of rolling the new blanks;
the device is characterized by further comprising two PLC controllers, wherein the rotary feeding frame, the rotary straightening machine and the rotary receiving frame are electrically connected with the first PLC controller, and the parison tube feeding device and the seamless tube rolling mill are electrically connected with the second PLC controller.
Further, a first supporting roller set is arranged behind the blank tube feeding device, a rolling mill front positioning device is arranged between the first supporting roller set and the seamless tube rolling mill, and a mandrel detector is arranged on the rolling mill front positioning device; a second supporting roller set and a third supporting roller set are sequentially arranged between the seamless tube rolling mill and the rotary material receiving frame from front to back; the first support roller group is flush with the support blank and the positioning device in front of the rolling mill, the second support roller group and the third support roller group are arranged at the same height, and the new blank passes through the guide holes of the second support roller group and the third support roller group and extends to the rotary material receiving frame to complete material receiving operation; the mandrel bar detector is electrically connected to a controller on the seamless tube rolling mill.
Furthermore, an automatic winding tension controller is arranged between the second supporting roller group and the third supporting roller group and is electrically connected with the first PLC controller.
The rotary material feeding frame and the rotary material receiving frame are identical in structure and comprise a material frame base, a rotary arm, a material frame upper support and a rotary arm driving assembly, the material frame upper support is connected to the top surface of the material frame base, the rotary arm is connected to the material frame upper support through a rotary shaft, the rotary shaft is rotatably mounted in the center of the material frame upper support through a first bearing, one end, away from the rotary arm, of the rotary shaft is connected with the rotary arm driving assembly, and the rotary shaft and the rotary arm are driven by the rotary arm driving assembly to rotate around the central axis of the rotary shaft; and a reel is installed at the opening end of the rotating arm.
Further, swinging boom drive assembly is including following driving wheel, action wheel and a driving motor, connect from the driving wheel the one end of swinging boom is kept away from to the rotation axis, be connected with on a driving motor's the output shaft the action wheel, the action wheel with connect through the drive belt transmission from the driving wheel, a driving motor settles on the bottom surface of work or material rest base one side, a driving motor starts to drive the action wheel rotatory to it is rotatory from the driving wheel to drive through the drive belt, pass through the rotation axis and drive swinging boom and spool with the axis of rotation axis is the axle center and makes rotary motion, the operation of putting or receiving pipe is accomplished in step to the spool.
Furthermore, rotatory straightening machine includes straightener frame, a straightening barrel and rotary driving subassembly, the both ends of straightening barrel are connected with central connecting axle, the rotatable connection of second bearing is in through the central connecting axle in the straightener frame, be provided with multiunit straightener roller in the straightening barrel side by side, the periphery of straightening barrel with the rotary driving subassembly is connected, and through the rotary driving subassembly drive the straightening barrel with the axis of central connecting axle makes rotary motion as the axle center.
Furthermore, the rotary driving assembly comprises a driven gear, a driving gear and a second driving motor, the second driving motor is arranged in the middle of the bottom of the straightening machine frame, the driven gear is positioned and connected to the outer peripheral surface of the straightening barrel, the driving gear is connected to an output shaft of the second driving motor, and the driven gear is meshed with the driving gear; the second driving motor is started, the driving gear rotates and drives the driven gear to rotate, then the straightening barrel is driven to rotate by taking the central axis of the central connecting shaft as an axis, and the straightening roller synchronously operates to finish the blank pipe straightening operation.
Further, the blank pipe feeding device comprises a feeding device support, a lower supporting roller and an upper adjusting roller, the lower supporting roller is connected to the feeding device support, the upper adjusting roller is arranged above the lower supporting roller in parallel, and the upper adjusting roller is connected to the feeding device support in an adjustable mode.
Furthermore, the top of feeding device support is provided with the U-shaped groove, the both ends of going up the dancer rools are connected on adjust cylinder's telescopic link, adjust cylinder installs on the top surface of feeding device support, adjust cylinder's telescopic link stretches out or withdraws the drive go up the dancer rools and move down or rise, go up the both ends of dancer rools and imbed the U-shaped inslot, and go up the both ends size of dancer rools with the width phase-match in U-shaped groove.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model relates to a large-length seamless tube rolling production line, which comprises a rotary feeding frame, a rotary straightening machine, a blank tube feeding device, a seamless tube rolling mill and a rotary receiving frame, wherein the rotary feeding frame and the rotary receiving frame are designed to realize synchronous rotation and tube receiving and releasing operation in the seamless tube rolling process.
In general, the utility model has reasonable layout, forms a new production line through the improvement and selection of equipment, realizes the rolling of the reel type seamless pipe through the technological processes of pipe releasing, straightening, cold rolling and coiling, has larger length and directly meets the use requirement of a deep well through the continuous seamless pipe formed after rolling for many times, and has larger advantage on material saving on subsection; the large-length seamless pipe has no welding seam interface, stable performance, long service life and smaller probability of problems.
Drawings
The utility model is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of a long seamless tube rolling line according to the present invention;
FIG. 2 is a schematic view of a rotary material-placing rack according to the present invention;
FIG. 3 is a schematic view showing the structure of a rotary leveler of the present invention;
FIG. 4 is a schematic view of the structure of the parison tube feeding apparatus of the present invention;
FIG. 5 is a side view of a feeder device holder of the present invention;
description of reference numerals: 1. rotating the discharging frame; 2. rotating the straightening machine; 3. a parison tube feeding device; 4. a first set of support rollers; 5. a rolling mill front positioning device; 6. a core rod detector; 7. a seamless tube rolling mill; 8. a second set of support rollers; 9. a winding automatic tension controller; 10. a third support roller set; 11. rotating the material receiving frame;
101. a rack base; 102. a rotating shaft; 103. a rotating arm; 104. a material rack upper support; 105. a first bearing; 106. a driven wheel; 107. a transmission belt; 108. a driving wheel; 109. a first drive motor; 110. a reel;
201. a straightening machine frame; 202. a straightening barrel; 203. a straightening roll; 204. a driven gear; 205. a central connecting shaft; 206. a second bearing; 207. a driving gear; 208. a second drive motor;
301. a feeding device holder; 302. a lower support roller; 303. an upper regulating roller; 304. adjusting the air cylinder; 301-1, U-shaped groove.
Detailed Description
As shown in FIGS. 1 to 5, a rolling line of a long seamless tube comprises a rotary feeding frame 1, a rotary leveler 2, a blank tube feeding device 3, a seamless tube rolling mill 7 and a rotary receiving frame 11, the rotary discharging frame 1, the rotary straightener 2, the blank pipe feeding device 3, the seamless pipe rolling mill 7 and the rotary collecting frame 11 are sequentially arranged on a straight line, blanks for rolling seamless pipes are wound on a reel, the reel is arranged on the rotary feeding frame 1, the end head of the blank extends forwards to sequentially pass through the rotary straightener 2 and the blank tube feeding device 3 and extend into the seamless tube rolling mill 7, a mandrel in the seamless tube rolling mill 7 is embedded into a central hole of the blank, rolling by the seamless tube rolling mill 7, wherein a new blank formed by rolling continues to extend forwards and is wound on a reel of the rotary material receiving frame 11, and the blank rotates around the axis of the blank in the process of rolling into the new blank;
the device is characterized by further comprising two PLC controllers, wherein the rotary feeding frame 1, the rotary straightening machine 2 and the rotary collecting frame 11 are electrically connected with a first PLC controller, and the parison tube feeding device 3 and the seamless tube rolling mill 7 are electrically connected with a second PLC controller. Specifically, the first PLC controller and the second PLC controller adopt the controllers of Siemens S7-1200 PLC.
Besides, related devices for grinding, deoiling and solid solution of the tube blank are arranged before and after the seamless tube rolling, the devices are the same as the conventional design, and the corresponding devices can be assembled at the corresponding positions of the production line.
A first supporting roller set 4 is arranged behind the blank tube feeding device 3, a rolling mill front positioning device 5 is arranged between the first supporting roller set 4 and a seamless tube rolling mill 7, and a mandrel detector 6 is arranged on the rolling mill front positioning device 5; a second supporting roller set 8 and a third supporting roller set 10 are sequentially arranged between the seamless tube rolling mill 7 and the rotary collecting rack 11 from front to back; the first supporting roller group 4 is used for supporting blanks to be flush with the rolling mill front positioning device 5, the second supporting roller group 8 and the third supporting roller group 10 are arranged at the same height, and the new blanks penetrate through the guide holes of the second supporting roller group 8 and the third supporting roller group 10 and extend to the rotary material receiving frame 11 to complete material receiving operation; the mandrel bar detector 6 is electrically connected to a controller on the seamless rolling mill 7.
Be provided with rolling automatic tension controller 9 between second support roller set 8 and the third support roller set 10, rolling automatic tension controller 9 with first PLC controller electricity is connected, rolling automatic tension controller 9 adopts current standard component, assemble to the assigned position of this production line can, rolling automatic tension controller 9's work end compresses tightly in the top of new blank, and tension when monitoring the blank rolling and with the signal transmission who records for first PLC controller, first PLC controller sends the instruction according to the monitoring data and adjusts the rotational speed of rotation receipts work or material rest 11.
As shown in fig. 2, the rotary feeding frame 1 and the rotary collecting frame 11 have the same structure, and include a frame base 101, a rotary arm 103, a frame upper support 104 and a rotary arm driving assembly, where the frame upper support 104 is connected to the top surface of the frame base 101, the rotary arm 103 is connected to the frame upper support 104 through a rotary shaft 102, the rotary shaft 102 is rotatably mounted in the center of the frame upper support 104 through a first bearing 105, one end of the rotary shaft 102 away from the rotary arm 103 is connected to the rotary arm driving assembly, and the rotary shaft 102 and the rotary arm 103 are driven by the rotary arm driving assembly to perform rotary motion with a central axis of the rotary shaft 102 as an axis; a reel 110 is mounted to an open end of the rotating arm 103.
Specifically, the rotating arm driving assembly includes a driven wheel 106, a driving wheel 108 and a first driving motor 109, the driven wheel 106 is connected to one end of the rotating shaft 102 far away from the rotating arm 103, an output shaft of the first driving motor 109 is connected to the driving wheel 108, the driving wheel 108 and the driven wheel 106 are in transmission connection through a transmission belt 107, and the first driving motor 109 is arranged on the bottom surface of one side of the rack base 101; during operation, the first driving motor 109 is started to drive the driving wheel 108 to rotate, and the driving wheel 106 is driven to rotate through the transmission belt 107, so that the rotating arm 103 and the reel 110 are driven by the rotating shaft 102 to rotate around the central axis of the rotating shaft 102, and the reel 110 synchronously completes pipe releasing or pipe retracting operations.
As shown in fig. 3, the rotating straightening machine 2 includes a straightening machine frame 201, a straightening barrel 202 and a rotation driving assembly, two ends of the straightening barrel 202 are connected with a central connecting shaft 205, the central connecting shaft 205 is rotatably connected to the straightening machine frame 201 through a second bearing 206, a plurality of groups of straightening rollers 203 are arranged in the straightening barrel 202 side by side, the periphery of the straightening barrel 202 is connected with the rotation driving assembly, and the rotation driving assembly drives the straightening barrel 202 to rotate around the central axis of the central connecting shaft 205.
Specifically, the rotary driving assembly comprises a driven gear 204, a driving gear 207 and a second driving motor 208, the second driving motor 208 is arranged in the middle of the bottom of the straightening machine frame 201, the driven gear 204 is positioned and connected to the outer peripheral surface of the straightening barrel 202, the driving gear 207 is connected to the output shaft of the second driving motor 208, and the driven gear 204 is meshed with the driving gear 207; during operation, the second driving motor 208 is started, the driving gear 207 rotates and drives the driven gear 204 to rotate, so as to drive the straightening barrel 202 to rotate around the central axis of the central connecting shaft 205, and the straightening rollers 203 synchronously operate to finish the blank pipe straightening operation.
As shown in fig. 4, the parison tube feeding device 3 includes a feeding device holder 301, a lower support roller 302, and an upper regulation roller 303, the lower support roller 302 being attached to the feeding device holder 301, the upper regulation roller 303 being arranged in parallel above the lower support roller 302, and the upper regulation roller 303 being adjustably attached to the feeding device holder 301.
As shown in fig. 5, a U-shaped groove 301-1 is formed in the top of the feeding device support 301, two ends of the upper adjusting roller 303 are connected to an expansion rod of an adjusting cylinder 304, the adjusting cylinder 304 is installed on the top surface of the feeding device support 301, the expansion rod of the adjusting cylinder 304 extends out or retracts to drive the upper adjusting roller 303 to move down or rise, two ends of the upper adjusting roller 303 are embedded into the U-shaped groove 301-1, and the size of two ends of the upper adjusting roller 303 is matched with the width of the U-shaped groove.
The working process of the utility model is as follows:
firstly, a reel wound with a blank is arranged on a rotary feeding frame 1, an empty reel is arranged on a rotary receiving frame 11, the end head of the blank extends forwards to sequentially pass through a rotary straightener 2 and a blank tube feeding device 3 and extend into a seamless tube rolling mill 7, a mandrel in the seamless tube rolling mill 7 is embedded into a central hole of the blank, and a new blank formed by rolling continues to extend forwards and is wound on the reel of the rotary receiving frame 11 through the rolling of the seamless tube rolling mill 7; the blank rotates around the axis of the blank in the process of rolling the blank into a new blank. In the rolling process, blanks and new blanks are supported by the first supporting roller group 4, the second supporting roller group 8 and the third supporting roller group 10 to keep a certain height, the cleanness of seamless pipes is kept, and pollution caused by falling in the production of the seamless pipes is avoided.
The seamless tube rolling mill 7 may be a floating mandrel mill known in the art, and may be installed in the production line, specifically referred to as 201510068531.9 entitled floating mandrel mill train for small-diameter seamless tubes and seamless tube production process.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. The utility model provides a big seamless pipe rolling production line of length which characterized in that: the seamless tube rolling mill comprises a rotary discharging frame, a rotary straightening machine, a blank tube feeding device, a seamless tube rolling mill and a rotary receiving frame, wherein the rotary discharging frame, the rotary straightening machine, the blank tube feeding device, the seamless tube rolling mill and the rotary receiving frame are sequentially arranged on a straight line, a blank for rolling a seamless tube is wound on a reel, the reel is installed on the rotary discharging frame, the end head of the blank extends forwards and sequentially penetrates through the rotary straightening machine and the blank tube feeding device and extends into the seamless tube rolling mill, a mandrel in the seamless tube rolling mill is embedded into a central hole of the blank, the new blank formed by rolling continues to extend forwards and is wound on the reel of the rotary receiving frame through rolling of the seamless tube rolling mill, and the blank rotates around the axis of the blank in the process of rolling into the new blank;
the automatic pipe blank rolling machine is characterized by further comprising two PLC controllers, the rotary feeding frame, the rotary straightening machine and the rotary collecting frame are electrically connected with the first PLC controller, and the pipe blank feeding device and the seamless pipe rolling mill are electrically connected with the second PLC controller.
2. A great length seamless tube rolling line according to claim 1, characterized in that: a first supporting roller set is arranged behind the blank tube feeding device, a rolling mill front positioning device is arranged between the first supporting roller set and the seamless tube rolling mill, and a mandrel detector is arranged on the rolling mill front positioning device; a second supporting roller set and a third supporting roller set are sequentially arranged between the seamless tube rolling mill and the rotary material receiving frame from front to back; the first supporting roller set is flush with the supporting blank and the rolling mill front positioning device, the second supporting roller set and the third supporting roller set are arranged at the same height, and the new blank penetrates through the guide holes of the second supporting roller set and the third supporting roller set and extends to the rotary material receiving frame to complete material receiving operation; the mandrel bar detector is electrically connected to a controller on the seamless tube rolling mill.
3. A great length seamless tube rolling line according to claim 2, characterized in that: and an automatic winding tension controller is arranged between the second support roller group and the third support roller group and is electrically connected with the first PLC controller.
4. A great length seamless tube rolling line according to claim 1, characterized in that: the rotary material placing frame and the rotary material receiving frame are identical in structure and comprise a material frame base, a rotary arm, a material frame upper support and a rotary arm driving assembly, the material frame upper support is connected to the top surface of the material frame base, the rotary arm is connected to the material frame upper support through a rotary shaft, the rotary shaft is rotatably mounted in the center of the material frame upper support through a first bearing, one end, away from the rotary arm, of the rotary shaft is connected with the rotary arm driving assembly, and the rotary shaft and the rotary arm are driven by the rotary arm driving assembly to rotate around the central axis of the rotary shaft; and a reel is installed at the opening end of the rotating arm.
5. A great length seamless tube rolling line according to claim 4, characterized in that: the swinging boom drive assembly is including following driving wheel, action wheel and a driving motor, connect from the driving wheel the one end of swinging boom is kept away from to the rotation axis, be connected with on a driving motor's the output shaft the action wheel, the action wheel with connect through the transmission belt transmission from the driving wheel, a driving motor settles on the bottom surface of work or material rest base one side, a driving motor starts to drive the action wheel rotatory to it is rotatory from the driving wheel to drive through the transmission belt, and the kansui passes through the rotation axis and drives swinging boom and spool with the axis of rotation axis is the axis and makes rotary motion, the synchronous pipe laying out or receipts of spool operation of accomplishing of spool.
6. A great length seamless tube rolling line according to claim 1, characterized in that: the rotary straightening machine comprises a straightening machine frame, a straightening barrel and a rotary driving assembly, wherein two ends of the straightening barrel are connected with a central connecting shaft, the central connecting shaft is rotatably connected onto the straightening machine frame through a second bearing, a plurality of groups of straightening rollers are arranged in the straightening barrel side by side, the periphery of the straightening barrel is connected with the rotary driving assembly, and the rotary driving assembly drives the straightening barrel to use the central axis of the central connecting shaft as an axis to make rotary motion.
7. The great-length seamless tube rolling line according to claim 6, characterized in that: the rotary driving assembly comprises a driven gear, a driving gear and a second driving motor, the second driving motor is arranged in the middle of the bottom of the straightening machine frame, the driven gear is positioned and connected to the outer peripheral surface of the straightening barrel, the driving gear is connected to an output shaft of the second driving motor, and the driven gear is meshed with the driving gear; the second driving motor is started, the driving gear rotates and drives the driven gear to rotate, then the straightening barrel is driven to rotate by taking the central axis of the central connecting shaft as an axis, and the straightening roller synchronously operates to finish the blank pipe straightening operation.
8. A great length seamless tube rolling line according to claim 1, characterized in that: the blank pipe feeding device comprises a feeding device support, a lower supporting roller and an upper adjusting roller, wherein the lower supporting roller is connected to the feeding device support, the upper adjusting roller is arranged above the lower supporting roller in parallel, and the upper adjusting roller is adjustably connected to the feeding device support.
9. The great-length seamless tube rolling line according to claim 8, characterized in that: the top of feeding device support is provided with the U-shaped groove, the both ends of going up the dancer rools are connected on adjust cylinder's telescopic link, adjust cylinder installs on the top surface of feeding device support, adjust cylinder's telescopic link stretches out or withdraws the drive go up the dancer rools and move down or rise, go up the both ends of dancer rools and imbed in the U-shaped inslot, and go up the both ends size of dancer rools with the width phase-match in U-shaped groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220093537.7U CN216937758U (en) | 2022-01-14 | 2022-01-14 | Large-length seamless tube rolling production line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220093537.7U CN216937758U (en) | 2022-01-14 | 2022-01-14 | Large-length seamless tube rolling production line |
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| Publication Number | Publication Date |
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| CN216937758U true CN216937758U (en) | 2022-07-12 |
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| CN202220093537.7U Active CN216937758U (en) | 2022-01-14 | 2022-01-14 | Large-length seamless tube rolling production line |
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| CN (1) | CN216937758U (en) |
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