A steel bar rolling production line

Abstract

The present invention is a steel bar rolling production line, comprising a heating furnace, a roller table, a roughing and medium rolling mill group, a water tank, a first guide groove section, a diameter gauge, a lifting assembly, a flying shear, a side looper, a finishing mill group, a second guide groove section, a pinch roller device and a guide roller group arranged in sequence along the rolling direction; the first guide groove section is an integrated guide groove, and a plurality of supporting wheels for conveying rolled pieces are arranged at the bottom of the first guide groove section. The present invention can ensure that the rolled piece will not rub against the tongue plate inside the flying shear when rolling and passing through the flying shear, and can be smoothly conveyed when passing through the second guide groove section after the finishing mill group, thereby reducing the friction between the rolled piece and the guide groove, and finally when passing through the exit of the pinch roller device, the surface quality of the finished product is guaranteed by the design of the roller, thereby effectively improving the production quality of the finished product, and at the same time, because the guide groove is made of titanium alloy material, the service life of the entire production line is longer, and the production of the rolled piece is guaranteed by the rapid replacement of the supporting wheels and the non-stopping of the diameter gauge during maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of steel rolling, and in particular to a steel bar rolling production line. Background Art

[0002] Rolling is a metal processing process that passes a metal billet through the gap between a pair of rotating rollers (of various shapes). Due to the compression of the rollers, the cross-section of the material is reduced and the length is increased. In steel rolling technology, the steel is heated during the rolling process, and then repeatedly rolled in the primary rolling mill before entering the finishing mill. On the hot rolling production line, the rolled piece is heated and softened, and is fed into the rolling mill by the rollers, and finally rolled into the size required by the user; however, the following problems exist in the hot rolling process of bars:

[0003] 1. During the rolling process, the bar rolled pieces pass through the rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling mills respectively. In the actual production process, the recovery guide groove from the pre-finishing rolling outlet to the finishing rolling mill is relatively long, and it also needs to pass directly through the flying shear and side looper. Due to tension problems in the guide groove, the rolled pieces may rub against the inner tongue plate of the flying shear when the side looper is lifted, generating a large number of sparks, and then causing scratches between the rolled pieces and the inner tongue plate of the flying shear. The surface scratches bring certain troubles to the quality of the finished steel products, resulting in metallographic folding and scratches on the finished wire products;

[0004] 2. In the current traditional rolling line, the guide groove supporting wheel after pre-finishing rolling needs to be fixed with multiple bolts when installed on the bracket, which takes a long time. Once the supporting wheel is stuck, it will cause abnormal rolling line, and then the supporting wheel needs to be disassembled for replacement. At present, due to the fixing of multiple bolts, it takes about 15 minutes to replace each supporting wheel. When there are multiple replacements, it takes even longer, which is not conducive to the rapid resumption of production of the production line;

[0005] 3. In traditional rolling lines, since there is a downward bending angle from the outlet guide groove of the feed roller to the spinning machine, when the rolled piece comes out from the outlet of the pinch roller, it is easy to rub against the straight tube head of the spinning machine, especially when rolling large-sized products, which makes the wire very easy to be scratched, scratched and other abnormalities, resulting in the surface quality of mass-produced products not meeting the standards and failing to meet customer requirements; at the same time, due to the friction problem, the pinch rollers and the spinning machine will also cause wear, and it is necessary to stop the machine every once in a while to replace the pinch roller outlet and the spinning machine inlet straight tube, affecting production efficiency. Summary of the invention

[0006] The present invention provides a steel bar rolling production line to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A steel bar rolling production line comprises a heating furnace, a roller table, a roughing and medium rolling mill group, a water tank, a first guide groove section, a diameter gauge, a lifting assembly, a flying shear, a side looper, a finishing mill group, a second guide groove section, a pinch roller device and a guide roller group arranged in sequence along a rolling direction;

[0009] The first guide groove section is an integrated guide groove, and a plurality of supporting wheels for conveying rolled pieces are arranged at the bottom of the first guide groove section, and a stabilizing component is respectively arranged at the bottom of the plurality of supporting wheels;

[0010] A temporary guide groove is provided on one side of the caliper, and when the caliper moves, the temporary guide groove corresponds to one end of the first guide groove section;

[0011] A signal detector is arranged between the finishing mill and the flying shear, and the signal detector is used to control the operation of the lifting component according to the detection signal, and the lifting component is used to lift the rolled piece after receiving the signal;

[0012] The second guide groove section is a plurality of segmented guide grooves, each segmented guide groove in the second guide groove section is respectively connected to a first guide roller, and a roller is arranged at one end of the guide roller group away from the pinch roller device.

[0013] Preferably, the lifting assembly includes a lifting device, a lifting guide groove connected to the lifting device, and a tugboat installed at one end of the lifting guide groove, and the tugboat is arranged at one end close to the flying shear.

[0014] Preferably, the stabilizing component includes a steel plate box, a U-shaped frame arranged in the steel plate box, and a positioning pin that passes through the steel plate box and limits the U-shaped frame, and the supporting wheel is rotatably installed on the inner side of the U-shaped frame.

[0015] Preferably, a movable frame is provided at the bottom of the caliper, a track is provided at the bottom of the movable frame, a pneumatic cylinder for driving the movable frame to move is provided on the track, and the temporary guide groove is installed on the movable frame.

[0016] Preferably, each segmented guide groove in the second guide groove section is respectively connected to two first guide rollers, and the two first guide rollers are respectively arranged at two ends of the segmented guide groove.

[0017] Preferably, the lifting device is any one of a pneumatic cylinder or an electric cylinder.

[0018] Preferably, the length of the steel plate box is greater than the length of the U-shaped frame, and one end of the U-shaped frame is connected to a traction handle.

[0019] Preferably, two parallel surfaces of the steel plate box are respectively provided with through holes, and the positioning pins are simultaneously arranged in the two through holes.

[0020] Preferably, the center connecting line of the two through holes is inclined.

[0021] Preferably, the guide grooves in the first guide groove section and the second guide groove section are both made of titanium alloy material.

[0022] By adopting the above technical solution, the beneficial effects achieved by the present invention are:

[0023] In the present invention, the passage of the rolled piece is detected by a signal detector, so that the signal detector can transmit the detection signal to the external control device, and then the external control device can control the operation of the lifting device, prompting the lifting device to push one end of the lifting guide groove to lift the rolled piece, so that after the rolled piece is lifted, it will not rub against the tongue plate inside the flying shear when passing through the flying shear, thereby effectively improving the surface quality of the finished product.

[0024] In the present invention, rollers are arranged at the outlet of the pinch roller device, so that when the workpiece comes out of the outlet of the pinch roller device, the guide roller group guides the workpiece downward, and the sliding friction is changed into rolling friction, thereby avoiding the wear of the workpiece, the pinch roller device and the straight tube of the spinning machine. It is known from actual use that after the rollers are added, the replacement frequency of the outlet of the pinch roller device and the inlet straight tube of the spinning machine is reduced, and only the rollers need to be replaced, thereby greatly improving the working efficiency.

[0025] In the present invention, after the staff pulls out the positioning pin, the U-shaped frame and the supporting wheel can be pulled out manually with the help of the traction handle, and the new supporting wheel and U-shaped frame can be replaced. Finally, the positioning pin is inserted into the through hole to make the U-shaped frame and the supporting wheel stable, so that the supporting wheel can be quickly replaced, which is conducive to the rapid resumption of production of the production line.

[0026] In the present invention, the pneumatic cylinder drives the movable frame to move on the track through the operation of the pneumatic cylinder, thereby enabling the temporary guide groove to move to the original center position of the diameter gauge after the diameter gauge moves, so that when the diameter gauge is repaired, the temporary guide groove can temporarily replace the diameter gauge to transport the rolled piece, thereby reducing the downtime of the production line and ensuring the operation of the production line.

[0027] In the present invention, first guide rollers are respectively installed at both ends of each segmented guide groove in the second guide groove section, so that the rolled pieces after passing through the finishing mill can be smoothly conveyed, the friction between the rolled pieces and the guide groove is reduced, and the surface quality of the finished product is effectively improved.

[0028] In the present invention, the guide grooves in the first guide groove section and the second guide groove section are both made of titanium alloy material, so that the service life of the first guide groove section and the second guide groove section is prolonged and the maintenance frequency is reduced.

[0029] In summary, in a steel bar rolling production line of the present invention, the rolled piece will not rub against the tongue plate inside the flying shear when rolling, and can be smoothly conveyed when passing through the second guide groove section after the finishing mill, thereby reducing the friction between the rolled piece and the guide groove. Finally, when passing through the exit of the clamping roller device, the surface quality of the finished product is ensured by the design of the roller, thereby effectively improving the production quality of the finished product. At the same time, because the guide groove is made of titanium alloy material, the service life of the entire production line is extended, and the rapid replacement of the support wheel and the maintenance of the diameter gauge without stopping the machine are beneficial to ensuring the production of the rolled piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a steel bar rolling production line provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the stabilizing component of the present invention;

[0032] Figure 3 It is a schematic diagram of the top view of the structure of the stabilizing assembly of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the first guide roller of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the lifting assembly of the present invention;

[0035] Figure 6 It is a schematic diagram of the temporary guide groove structure of the present invention.

[0036] In the figure: 1. Heating furnace; 2. Roller table; 3. Roughing and medium rolling mill group; 4. Water tank; 5. First guide groove section; 6. Support wheel; 61. Steel plate box; 62. U-shaped frame; 63. Locating pin; 64. Towing handle; 65. Through hole; 7. Diameter gauge; 8. Lifting assembly; 81. Lifting device; 82. Lifting guide groove; 83. Tugboat; 9. Flying shear; 10. Side looper; 11. Signal detector; 12. Finishing mill group; 13. Second guide groove section; 14. Pinch roller device; 15. Guide roller group; 16. Temporary guide groove; 17. First guide roller; 18. Roller; 19. Moving frame; 20. Track; 21. Pneumatic cylinder. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. Example

[0039] like Figure 1-6 As shown, the present invention provides a steel bar rolling production line, comprising a heating furnace 1, a roller table 2, a roughing and medium rolling mill group 3, a water tank 4, a first guide groove section 5, a diameter gauge 7, a lifting assembly 8, a flying shear 9, a side looper 10, a finishing mill group 12, a second guide groove section 13, a pinch roller device 14 and a guide roller group 15 arranged in sequence along the rolling direction;

[0040] The first guide groove section 5 is an integrated guide groove, and a plurality of supporting wheels 6 for conveying rolled pieces are arranged at the bottom of the first guide groove section 5, and a stabilizing component is respectively arranged at the bottom of the plurality of supporting wheels 6;

[0041] A temporary guide groove 16 is provided on one side of the caliper 7. When the caliper 7 moves, the temporary guide groove 16 corresponds to one end of the first guide groove section 5.

[0042] A signal detector 11 is arranged between the finishing mill 12 and the flying shear 9. The signal detector 11 is used to control the operation of the lifting component 8 according to the detection signal. The lifting component 8 is used to lift the rolled piece after receiving the signal. The signal detector 11 adopts a temperature infrared thermometer. Because when the red steel rolled piece passes through the flying shear 9 and enters the interior of the finishing mill 12, the rolled piece itself has a certain temperature, so the signal detector 11 can detect the passage of the rolled piece. Therefore, after the signal detector 11 detects it, it can transmit the signal to the external control device, and then the external control device can control the lifting device 81 to work, prompting the lifting device 81 to push the lifting guide groove 82 to lift the rolled piece, so that the subsequent rolled piece will not rub against the tongue plate inside the flying shear 9 when passing through the flying shear 9, effectively improving the surface quality and internal metallographic structure of the finished product, and this scheme only protects the physical structure, and does not protect the program of the signal detector 11 and the external control device. Therefore, this article does not elaborate on the program part in detail, and although this article does not elaborate on it in detail, the program part is already well known to those skilled in the art and can be used for programming;

[0043] Furthermore, for the finished rolled pieces normally produced by the production line, the head portion of the rolled pieces will generally be sheared, so after the rolled pieces enter the flying shear 9 and output the portion detected by the signal detector 11, it will be sheared off in the subsequent normal process and will not affect the quality of the finished product of the entire rolled piece; and if the head of the rolled piece is not sheared, the staff can install the signal detector 11 at the top position of the lifting guide groove 82 to enable the signal detector 11 to directly detect the passing of the rolled piece in the lifting guide groove 82, so that when the rolled piece passes, the signal detector 11 directly detects and transmits the detection signal to the external control device, thereby lifting one end of the lifting guide groove 82 to avoid the problem of friction between the rolled piece and the tongue plate in the flying shear 9.

[0044] The second guide groove section 13 is a plurality of segmented guide grooves. Each segmented guide groove in the second guide groove section 13 is respectively connected to a first guide roller 17 , and a roller 18 is provided at one end of the guide roller group 15 away from the pinch roller device 14 .

[0045] In this embodiment, the lifting assembly 8 includes a lifting device 81, a lifting guide groove 82 connected to the lifting device 81, and a tugwheel 83 installed at one end of the lifting guide groove 82. The tugwheel 83 is arranged at one end close to the flying shear 9. The lifting device 81 is either a pneumatic cylinder or an electric cylinder.

[0046] Specifically, when the lifting guide groove 82 is installed and used, its end away from the tugboat 83 is movably installed on the production line support, and the bottom of the lifting guide groove 82 is movably connected to the output end of the lifting device 81, and the bottom of the lifting device 81 is movably installed on the production line support, so that when the lifting device 81 is working, it can push the end with the tugboat 83 to lift, so that the rolled piece in the lifting guide groove 82 is lifted, reducing the friction between the rolled piece and the tongue plate in the flying shear 9, and effectively improving the surface quality and internal metallographic structure of the finished product.

[0047] In this embodiment, the stabilizing component includes a steel plate box 61, a U-shaped frame 62 arranged in the steel plate box 61, and a positioning pin 63 that passes through the steel plate box 61 and limits the U-shaped frame 62, and the support wheel 6 is rotatably installed on the inner side of the U-shaped frame 62. When the stabilizing component is actually used, a plurality of arc grooves are opened at the bottom of the first guide groove section 5 to ensure that the support wheel 6 can be arranged in the arc groove after the U-shaped frame 62 is placed firmly, so that it can be flush with the bottom of the guide groove in the first guide groove section 5 to meet the transportation of the rolled piece.

[0048] Furthermore, the length of the steel box 61 is greater than the length of the U-shaped frame 62, and one end of the U-shaped frame 62 is connected to a traction handle 64. The length of the steel box 61 can satisfy the pulling of the U-shaped frame 62 inside the steel box 61, thereby enabling the U-shaped frame 62 to drive the support wheel 6 to break away from the bottom of the first guide groove section 5, so that the support wheel 6 can be quickly pulled out when replaced, without the need to manually loosen the screws one by one and spend time.

[0049] Furthermore, two parallel surfaces of the steel plate box 61 are respectively provided with through holes 65, and the locating pins 63 are simultaneously arranged in the two through holes 65. The center connecting line of the two through holes 65 is inclined. After the supporting wheel 6 is replaced, the locating pin 63 can be manually inserted into the through hole 65, so that the locating pin 63 is restricted to one end of the U-shaped frame 62, thereby achieving the stability of the U-shaped frame 62 after being restricted. There is no need to tighten the screws one by one to fix it, which saves time and effort and is conducive to the rapid resumption of production of the production line. Moreover, since the center connecting line of the two through holes 65 is inclined, the locating pin 63 is inclined after insertion and is not easy to fall off.

[0050] In this embodiment, a movable frame 19 is provided at the bottom of the diameter gauge 7, a track 20 is provided at the bottom of the movable frame 19, and a pneumatic cylinder 21 for driving the movable frame 19 to move is provided on the track 20, and the temporary guide groove 16 is installed on the movable frame 19. By utilizing the operation of the pneumatic cylinder 21, the pneumatic cylinder 21 drives the movable frame 19 to move on the track 20, so that the temporary guide groove 16 can move to the original center position of the diameter gauge 7 after the diameter gauge 7 moves, so that when the diameter gauge 7 is repaired, the temporary guide groove 16 can temporarily replace the diameter gauge 7 to transport the rolled piece.

[0051] In this embodiment, two first guide rollers 17 are respectively connected to each segmented guide groove in the second guide groove section 13, and the two first guide rollers 17 are respectively arranged at the two ends of the segmented guide groove. The installation of the first guide rollers 17 allows the rolled pieces to be smoothly transported after passing through the finishing mill 12, reducing the friction between the rolled pieces and the guide grooves, and effectively improving the surface quality of the finished products.

[0052] In this embodiment, the guide grooves in the first guide groove section 5 and the second guide groove section 13 are both made of titanium alloy material, which prolongs the service life of the first guide groove section 5 and the second guide groove section 13 and reduces the frequency of maintenance. The temporary guide groove 16 can also be made of titanium alloy material according to actual conditions, so that when the diameter gauge 7 fails and needs maintenance, the temporary guide groove 16 can stably transport the rolled piece for a long time, thereby reducing the replacement frequency of the temporary guide groove 16.

[0053] The working principle and use process of the present invention are as follows: when red steel is produced, it passes through a heating furnace 1, a roller table 2, a roughing and medium rolling mill group 3, a water tank 4, a first guide groove section 5, a diameter gauge 7, a lifting assembly 8, a flying shear 9, a side looper 10, a finishing mill group 12, a second guide groove section 13, a pinch roller device 14 and a guide roller group 15 in sequence. When the red steel rolled piece passes through the flying shear 9 and enters the interior of the finishing mill group 12, the signal detector 11 can detect the passage of the rolled piece, so that the signal detector 11 can transmit the signal after detecting the passage. The external control device can then control the lifting device 81 to work, prompting the lifting device 81 to push one end of the lifting guide groove 82 to lift the rolled piece, so that the rolled piece will not rub against the tongue plate inside the flying shear 9 when passing through the flying shear 9 after being lifted, effectively improving the surface quality of the finished product, and when the rolled piece passes through the second guide groove section 13 after passing through the finishing mill 12, because both ends of each guide groove in the second guide groove section 13 are provided with a first guide roller 17, the rolled piece can be smoothly transported, reducing the friction between the rolled piece and the guide groove. The friction between them can effectively improve the surface quality of the finished product. Finally, after the rolled piece passes through the pinch roller device 14 and the guide roller group 15, a roller 18 is set at the outlet of the pinch roller device 14, so that when the rolled piece comes out of the outlet of the pinch roller device 14, the guide roller group 15 guides the rolled piece downward, and the sliding friction is changed to rolling friction, thereby avoiding the wear of the rolled piece, the pinch roller device 14 and the straight tube of the spinning machine. It is known from actual use that after adding the roller 18, the replacement frequency of the outlet of the pinch roller device 14 and the straight tube of the spinning machine inlet is reduced. Only the roller 18 needs to be replaced, which greatly improves the working efficiency. At the same time, when the supporting wheel 6 is blocked and needs to be replaced, the staff will pull out the positioning pin 63, so that the U-shaped frame 62 and the supporting wheel 6 can be pulled out manually with the help of the traction handle 64, and the new supporting wheel 6 and U-shaped frame 62 are replaced. Finally, the positioning pin 63 is inserted into the through hole 65 to make the U-shaped frame 62 and the supporting wheel 6 stable, so as to realize the rapid replacement of the supporting wheel 6, which is conducive to the rapid resumption of production of the production line.

[0054] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The term "and / or" used herein includes any and all combinations of one or more related listed items. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0055] It should be noted that when an element is referred to as being "assembled on", "installed on", "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0056] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A steel bar rolling production line, characterized in that: The invention comprises a heating furnace (1), a roller table (2), a roughing and medium rolling mill group (3), a water tank (4), a first guide groove section (5), a diameter gauge (7), a lifting assembly (8), a flying shear (9), a side looper (10), a finishing mill group (12), a second guide groove section (13), a pinch roller device (14) and a guide roller group (15) which are sequentially arranged along a rolling direction; The first guide groove section (5) is an integrated guide groove, and a plurality of supporting wheels (6) for conveying rolled pieces are arranged at the bottom of the first guide groove section (5), and a stabilizing component is respectively arranged at the bottom of the plurality of supporting wheels (6); A temporary guide groove (16) is provided on one side of the caliper (7), and when the caliper (7) moves, the temporary guide groove (16) corresponds to one end of the first guide groove section (5); A signal detector (11) is provided between the finishing mill group (12) and the flying shear (9), the signal detector (11) being an infrared temperature measuring instrument, the signal detector (11) being used to control the operation of the lifting component (8) according to the detection signal, the lifting component (8) being used to lift the rolled piece after receiving the signal; The second guide groove section (13) is a plurality of segmented guide grooves, each segmented guide groove in the second guide groove section (13) is respectively connected to two first guide rollers (17), and the two first guide rollers (17) are respectively arranged at two ends of the segmented guide groove, and a roller (18) is arranged at one end of the guide roller group (15) away from the pinch roller device (14).

2. A steel bar rolling production line according to claim 1, characterized in that: The lifting assembly (8) comprises a lifting device (81), a lifting guide groove (82) connected to the lifting device (81), and a tugwheel (83) installed at one end of the lifting guide groove (82), wherein the tugwheel (83) is arranged at one end close to the flying shear (9).

3. A steel bar rolling production line according to claim 1, characterized in that: The stabilizing assembly comprises a steel plate box (61), a U-shaped frame (62) arranged in the steel plate box (61), and a positioning pin (63) penetrating the steel plate box (61) and limiting the position of the U-shaped frame (62), and the supporting wheel (6) is rotatably mounted on the inner side of the U-shaped frame (62).

4. A steel bar rolling production line according to claim 1, characterized in that: A movable frame (19) is provided at the bottom of the caliper (7), a track (20) is provided at the bottom of the movable frame (19), and a pneumatic cylinder (21) is provided on the track (20) for driving the movable frame (19) to move, and the temporary guide groove (16) is installed on the movable frame (19).

5. A steel bar rolling production line according to claim 2, characterized in that: The lifting device (81) is any one of a pneumatic cylinder and an electric cylinder.

6. A steel bar rolling production line according to claim 3, characterized in that: The length of the steel plate box (61) is greater than the length of the U-shaped frame (62), and one end of the U-shaped frame (62) is connected to a traction handle (64).

7. A steel bar rolling production line according to claim 6, characterized in that: Two parallel surfaces of the steel plate box (61) are respectively provided with through holes (65), and the positioning pins (63) are simultaneously arranged in the two through holes (65).

8. A steel bar rolling production line according to claim 7, characterized in that: The center connecting line of the two through holes (65) is arranged obliquely.

9. A steel bar rolling production line according to claim 1, characterized in that: The guide grooves in the first guide groove section (5) and the second guide groove section (13) are both made of titanium alloy material.

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