CN112692068B - Automatic core rod circulating device for rolling mill - Google Patents

Abstract

The invention discloses an automatic mandrel circulating device for a rolling mill, which comprises a first scheduling device, a second scheduling device, a mandrel, a blank pipe feeding assembly line, a mandrel circulating assembly line, an assembly line mandrel locking device, a mandrel left and right limiting rolling device, a rolling mill discharging assembly line, a rolling mill feeding assembly line and a finished product pipe, wherein the first scheduling device, the second scheduling device and the rolling mill are all arranged on the ground, and the first scheduling device and the second scheduling device are arranged oppositely; the invention provides an automatic core rod circulating device for a rolling mill, which can effectively solve the circulating processes of automatic core rod feeding, automatic blank tube feeding, automatic tensioning, automatic rolling, automatic unlocking, automatic finished tube feeding and automatic core rod discharging of the core rod for the rolling mill, reduce the labor intensity, reduce the labor cost and improve the automation degree.

Description

Automatic core rod circulating device for rolling mill

Technical Field

The invention relates to the technical field of rolling mills, in particular to an automatic mandrel circulating device for a rolling mill.

Background

At present, a rolling mill is an essential production device in the production of steel pipes, but a mandrel mill faces a great problem in production, particularly, a mandrel is difficult to extract after rolling, and the turnover time of the mandrel is long, so that the rolling efficiency of the mandrel mill is low, the energy consumption loss is large, and the production cost is high.

Disclosure of Invention

The invention provides an automatic mandrel circulating device for a rolling mill, aiming at the defects in the prior art.

In order to solve the technical problems, the invention is solved by the following technical scheme: the automatic mandrel circulating device for the rolling mill comprises a first scheduling device, a second scheduling device, a mandrel, a blank pipe feeding assembly line, a mandrel circulating assembly line, an assembly line mandrel locking device, a mandrel left-right limiting rolling device, a rolling mill discharging assembly line, a rolling mill feeding assembly line and a finished product pipe, wherein the first scheduling device, the second scheduling device and the rolling mill are all arranged on the ground, and the first scheduling device and the second scheduling device are arranged in opposite directions.

The left side of the mandrel circulation assembly line is provided with an assembly line mandrel locking device, the left side and the right side of the frame are both provided with a left mandrel limiting rolling device and a right mandrel limiting rolling device, the middle of the right side is provided with a neutral gear with the length being larger than a finished product pipe and smaller than the mandrel, the neutral gear is an outflow port of the finished product pipe, the mandrel circulation assembly line is arranged in the middle of the first scheduling device and the second scheduling device, and the center line of the mandrel circulation assembly line is aligned with the center lines of the right side tracks of the first scheduling device and the second scheduling device.

The automatic production line has the advantages that the core rod can accurately flow into the running track of the first dispatching device, the outflow port of the finished product pipe is arranged, the finished product pipe can automatically flow out of the production line after being separated from the core rod conveniently, and the core rod continues to be on the production line to perform next cycle operation.

The distance between the roller at the leftmost side of the blank tube feeding assembly line and the first scheduling device is larger than the length of the mandrel, a mandrel left-right limiting rolling device is arranged on the rack at the left side, the blank tube feeding assembly line is positioned right above the mandrel circulating assembly line, and the height position of the blank tube feeding assembly line is lower than the track above the first scheduling device.

The mandrel has the beneficial effects that the blank pipe can automatically align to the center and automatically flow into the mandrel.

The rolling mill is positioned between the output rolling mill assembly line and the input rolling mill assembly line, the three are positioned between the first scheduling device and the second scheduling device on the same central line, the output rolling mill assembly line is positioned on the right side of the rolling mill and matched with the second scheduling device, the input rolling mill assembly line is positioned on the left side of the rolling mill and matched with the first scheduling device, the central lines of the rolling mill, the output rolling mill assembly line and the input rolling mill assembly line are aligned with the central lines of the left side rails of the first scheduling device and the second scheduling device, the height positions of the output rolling mill assembly line and the input rolling mill assembly line are the same, in the middle of the upper guide rail and the lower guide rail of the first scheduling device, the rolling central line of the rolling mill is aligned with the central lines of the mandrills transported by the output rolling mill assembly line and the input rolling mill assembly line, and the left and right mandrel limiting rolling devices are arranged on the right side of the output rolling mill assembly line.

The mandrel automatic control system has the advantages that the mandrel can automatically separate from the first scheduling device after moving to the assembly line of the rolling mill, automatically enters the rolling mill after the assembly line of the rolling mill is aligned with the center, automatically flows into the assembly line of the rolling mill after rolling, and then is locked in the running track of the second scheduling device after the assembly line of the rolling mill is automatically aligned with the center, so that the second scheduling device can drive the mandrel to move.

In the above technical solution, preferably, the mandrel includes a mandrel rotating shaft, a mandrel sleeve, a first dividing outer ring, a second dividing outer ring, a third dividing outer ring, a fourth dividing outer ring, a fifth dividing outer ring, a sixth dividing outer ring and a tension spring, the mandrel rotating shaft includes a first pinion, a right limiting spherical groove, a rotating shaft, a middle groove, a middle spherical groove, a second pinion and a left limiting spherical groove, the mandrel sleeve includes a right shaft sleeve, a right groove, a sleeve, an outer ring guide post hole, a second tension spring ring, a left shaft sleeve, a left groove, a first mandrel locking hole and a second mandrel locking hole, the right shaft sleeve and the left shaft sleeve of the mandrel sleeve include a first spring hole, a first compression spring and a first ball, two ends of the first compression spring are respectively pressed and contacted with the bottom of the first spring hole and the surface of the first ball, the first ball is pressed and contacted with the surface of the rotating shaft of the mandrel, the relative position of the first spring hole and the outer ring guide post hole form an included angle of 30 degrees, the relative positions of a right limiting spherical groove, a middle spherical groove and a left limiting spherical groove on a mandrel rotating shaft are positioned on the same axis, the relative positions of a first split outer ring, a second split outer ring, a third split outer ring, a fourth split outer ring, a fifth split outer ring and a sixth split outer ring respectively comprise an outer ring guide post, an outer ring limiting ring, an outer ring top ball and a first tension spring ring, the rotating shaft on the mandrel rotating shaft is rotatably arranged in a central hole of a mandrel sleeve, the diameter of the right limiting spherical groove, the diameter of the middle spherical groove and the diameter of the left limiting spherical groove on the mandrel rotating shaft are respectively and uniformly provided with 6, the diameter of the outer ring guide post hole, the second tension spring ring, the first mandrel locking hole and the second mandrel locking hole on the mandrel sleeve are respectively and uniformly provided with 6, the first split outer ring, the second split outer ring, the outer ring and the second split outer ring are uniformly provided with the same height, An outer ring guide post on a third segmentation outer ring, a fourth segmentation outer ring, a fifth segmentation outer ring and a sixth segmentation outer ring is connected to an outer ring guide post hole on a core rod sleeve in a sliding mode, the diameter of the outer ring guide post hole is slightly larger than that of the outer ring guide post, an outer ring top ball is in abutting contact with a middle groove, two ends of a tension spring are connected to a second tension spring ring and a first tension spring ring respectively, the section shape of an outer ring part of the first segmentation outer ring is small outside and large inside, the section shapes of the second segmentation outer ring and the third segmentation outer ring are large outside and small inside, the fourth segmentation outer ring, the fifth segmentation outer ring and the sixth segmentation outer ring are divided uniformly, the right side surface of the second segmentation outer ring is in contact with the left side surface of the first segmentation outer ring, the left side surface of the third segmentation outer ring is in contact with the right side surface of the first segmentation outer ring, the right side of the fourth segmentation outer ring is in contact with the left side of the second segmentation outer ring, and the right side of the fifth segmentation outer ring is in contact with the left side of the fourth segmentation outer ring, and the left side of the sixth segmentation outer ring is in contact with the left side of the fifth segmentation outer ring, and the left side of the sixth segmentation outer ring is in contact with the right side of the third segmentation outer ring.

The core rod has the advantages that when the outer ring is pushed against the middle groove, the outer ring limiting ring is pushed against the inner wall of the core rod sleeve, the first segmentation outer ring, the second segmentation outer ring, the third segmentation outer ring, the fourth segmentation outer ring, the fifth segmentation outer ring and the sixth segmentation outer ring are mutually pushed to be dead, so that the whole core rod is in a tensioning state, the core rod rotating shaft is rotated, an outer ring pushing ball is pushed against the middle spherical groove under the action of a tension spring, the first segmentation outer ring slides downwards at the moment, so that the outer ring has a mouth, the diameter of an outer ring guide post hole is slightly larger than that of an outer ring guide post, and because all the segmentation outer rings are connected with the tension spring, the second segmentation outer ring, the third segmentation outer ring, the fourth segmentation outer ring, the fifth segmentation outer ring and the sixth segmentation outer ring can incline towards the first segmentation outer ring, so that the outer diameter of the whole core rod is reduced, and the core rod is in an unlocking state, so that the steel pipe can be conveniently passed in and out on the core rod.

In the above technical solution, preferably, the first scheduling device includes a circular guide rail, a chain, a rack plate, a scheduling limiting device, a sprocket, a motor and a scheduling base, the scheduling limiting device includes a first rotary hole, a first notch, a left guide projection, a right guide projection, a second compression spring and a second marble, a second spring hole is disposed at the middle position of the left guide projection and the right guide projection, two ends of the second compression spring are respectively pressed at the bottom of the second spring hole and the surface of the second marble, the size of the first notch is the same as that of the right shaft sleeve and the left shaft sleeve on the mandrel, the left guide projection and the right guide projection can be connected with the right groove and the left groove on the mandrel in a matching manner, the motor and the circular guide rail are disposed on the scheduling base, the sprocket is disposed on the motor, the sprocket is connected with the chain in a matching manner, the circular guide rail includes a U-shaped circular track and a circular sealing plate, the chain slides and sets up in the U style of calligraphy annular track of annular rail, and the chain includes the extension axle, and the annular shrouding setting is provided with the slip track groove of extension axle on the annular shrouding on U style of calligraphy annular track's opening, rack plate setting in the beneath position on annular rail's upper portion, and the dispatch stop device rotates to be connected on the extension axle on the chain.

The core rod tensioning and loosening device has the advantages that the core rod can be clamped by the scheduling limiting device, so that the core rod is driven to run on the track, when the core rod is conveyed to the position of the rack plate, the gear on the core rod can be meshed with the rack plate, the core rod rotating shaft of the core rod rotates, the purpose of tensioning or loosening the core rod is achieved, and the core rod can be transferred to each station.

In the above technical solution, preferably, the mandrel left and right limiting rolling device includes a left and right limiting base, a gear power shaft, a roller device, a transition device, a first guide shaft, a second guide shaft, a fourth compression spring, a roller device base and a fifth compression spring, the left and right limiting base includes a right gear shaft support frame, a left guide shaft fixing plate and a right guide shaft fixing plate, the gear power shaft includes a first belt pulley, a gear rotation shaft, a gear shaft, a second belt pulley, a first belt and a production line roller, the production line roller is a roller of all production lines and has power, the second belt pulley is disposed at one side of the production line roller and is in the same plane with the first belt pulley at the outer side of the production line frame, the first belt pulley is connected with the second belt pulley through the first belt, the first belt pulley is disposed at the left end of the gear rotation shaft, the gear shaft is arranged in the middle of the gear rotating shaft, the gear rotating shaft on the gear power shaft is rotationally arranged on the left gear shaft support frame and the right gear shaft support frame, the two ends of the first guide shaft and the second guide shaft are respectively arranged on the left guide shaft fixing plate and the right guide shaft fixing plate, the transition device comprises a transition flat gear, a transition flat gear shaft and a first bevel gear, the roller device base comprises a first guide hole, a second guide hole, a roller device connecting plate, a left connecting plate and a top connecting plate, the transition flat gear shaft is rotationally arranged on the left connecting plate, the roller device comprises a limiting roller, a limiting roller shaft and a second bevel gear, the limiting roller shaft on the roller device is rotationally arranged on the upper top connecting plate of the roller device base, the second bevel gear is meshed with the first bevel gear, the first guide hole and the second guide hole on the roller device base are respectively slidably arranged on the first guide shaft and the second guide shaft, and a transition flat gear shaft on the transition device is meshed with a gear shaft on a gear power shaft, and two ends of a fourth compression spring and two ends of a fifth compression spring are in pressure-equalizing contact with the right side of the left guide shaft fixing plate and the left side of the roller device base and are respectively arranged on the first guide shaft and the second guide shaft in a sliding manner.

The mandrel left and right limiting rolling device has the advantages that the mandrel left and right limiting rolling devices are arranged on the left and right sides of the assembly line, so that when a mandrel or a pipe is not on a central line, the limiting rollers on the two sides are close to the central line under the action of the compression spring, power can be provided for the mandrel or the pipe, and when the bottom roller slips, the mandrel or the pipe can continue to move with the help of the power on the limiting rollers.

In the above technical solution, preferably, the assembly line mandrel locking device includes a left fixing plate, a right fixing plate, a locking device roller, a locking bridge, a third compression spring and a square shaft locking frame, the square shaft locking frame 76 includes an annular buckle, a square shaft and a square shaft limiting plate, the locking bridge includes a left bridge plate, a right bridge plate, a bridge plate connecting plate, a square guiding hole and a bridge rotating rod, the locking device roller is rotatably disposed at the right ends of the left bridge plate and the right bridge plate, the square shaft of the square shaft locking frame is slidably disposed in the square guiding hole of the locking bridge, two ends of the third compression spring respectively contact the upper surface of the bridge plate connecting plate and the lower surface of the annular buckle, the upper surface of the square shaft limit plate on the square shaft locking frame is contacted with the lower surface of the bridge plate connecting plate, and the left side fixing plate and the right side fixing plate are respectively and rotatably arranged on the left side and the right side of the bridge rotating rod.

The locking device has the beneficial effects that when the core rod touches the roller of the locking device, the other end of the locking bridge frame tilts upwards under the action of the lever, the square shaft locking frame touches the core rod, the square shaft locking frame is compressed downwards under the action of the third compression spring, when the core rod moves to the locking position, the square shaft locking frame is aligned with the left groove or the right groove on the core rod, and at the moment, under the action of the third compression spring, the annular buckle on the square shaft locking frame slides into the left groove or the right groove on the core rod, so that the core rod cannot move continuously, and the effect of locking the core rod is achieved.

The beneficial effects of the invention are: the invention provides an automatic core rod circulating device for a rolling mill, which can effectively solve the circulating processes of automatic core rod feeding, automatic blank tube feeding, automatic tensioning, automatic rolling, automatic unlocking, automatic finished tube discharging and automatic core rod circulating of the core rod for the rolling mill, reduce the labor intensity, reduce the labor cost and improve the automation degree.

Drawings

FIG. 1 is a schematic view of the present invention.

FIG. 2 is a top view of the present invention.

FIG. 3 is a schematic view of the present invention.

FIG. 4 is a schematic view of a mandrel cycle line according to the present invention.

FIG. 5 is a partial schematic view of the present invention.

FIG. 6 is a schematic view of a rolling line according to the present invention.

Fig. 7 is a cross-sectional view of a mandrel of the present invention.

Fig. 8 is a longitudinal cross-sectional view of a mandrel of the present invention.

FIG. 9 is a schematic view of a mandrel shaft according to the present invention.

FIG. 10 is a schematic view of a mandrel collar of the present invention.

FIG. 11 is a partial schematic view of the outer ring of the mandrel of the present invention.

Fig. 12 is a longitudinal cross-sectional view of a mandrel of the present invention.

FIG. 13 is a diagram of a scheduling apparatus according to the present invention.

FIG. 14 is a cross-sectional view of a dispatching device of the present invention.

FIG. 15 is a transverse sectional view of the dispatching device of the invention.

FIG. 16 is a partial schematic view of a scheduling apparatus according to the present invention.

Fig. 17 is a schematic view of a scheduling limiting device according to the present invention.

Fig. 18 is a sectional view of the scheduling stop device of the present invention.

FIG. 19 is a schematic view of the core rod locking apparatus of the assembly line of the present invention.

FIG. 20 is a schematic view of an assembly line mandrel locking chassis of the present invention.

FIG. 21 is a schematic view of a mandrel lock buckle of the present invention.

FIG. 22 is a cross-sectional view of the in-line mandrel locking device of the present invention.

FIG. 23 is a schematic view of a mandrel bar left and right rolling stopper device according to the present invention.

FIG. 24 is a partial schematic view of a mandrel bar left and right rolling device according to the present invention.

FIG. 25 is a schematic view of a part of a mandrel bar left and right rolling stopper device according to the present invention.

FIG. 26 is a schematic view showing the installation of the rolling device for limiting the mandrel bar left and right according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1-26, an automatic mandrel circulating device for rolling mills comprises a first dispatching device 1, a second dispatching device 2, a mandrel 3, a blank pipe 4, a blank pipe feeding assembly line 5, a mandrel circulating assembly line 6, an assembly line mandrel locking device 7, a mandrel left and right limiting and rolling device 8, a rolling mill 9, a rolling mill discharging assembly line 10, a rolling mill feeding assembly line 11 and a finished product pipe 12.

The first scheduling device 1 and the second scheduling device 2 are oppositely arranged on the ground, the mandrel circulating assembly line 6 is arranged between the first scheduling device 1 and the second scheduling device 2, the center line of the mandrel circulating assembly line 6 is aligned with the right track center lines of the first scheduling device 1 and the second scheduling device 2, the position of the mandrel circulating assembly line 6 is higher than the bottom track center lines of the first scheduling device 1 and the second scheduling device 2, an assembly line mandrel locking device 7 is arranged on the left side of the mandrel circulating assembly line 6, left and right mandrel left and right limiting rolling devices 8 are arranged on a left rack and a right rack, a neutral gear with the length larger than a finished product pipe 12 and smaller than a mandrel 3 is arranged in the middle of the right side, and the neutral gear is an outflow port of the finished product pipe 12.

When the core rod 3 is pressed against the assembly line core rod locking device 7, and the assembly line core rod locking device 7 locks the right groove of the core rod 3, the left groove on the core rod 3 is aligned with the left guide projection 233 and the right guide projection 234 on the scheduling limiting device 23 on the first scheduling device 1, so that the scheduling limiting device 23 can accurately lock the core rod 3 when moving upwards, and the core rod 3 is driven to move upwards by the scheduling limiting device.

The blank pipe feeding assembly line 5 is positioned right above the mandrel circulating assembly line 6, the height position of the blank pipe feeding assembly line is lower than the upper track of the first dispatching device, the distance between the leftmost roller of the blank pipe feeding assembly line 5 and the first dispatching device 1 is larger than the length of the mandrel 3, and a left and right mandrel limiting rolling device 8 is arranged on the left rack.

Wherein, the left side of the blank pipe feeding assembly line 5 is provided with an inductive switch, when the core rod 3 moves upwards to the pipe feeding position, the assembly line is started, and the blank pipe 4 on the assembly line is sleeved on the core rod 3.

The rolling mill 9, the rolling mill outlet assembly line 10 and the rolling mill inlet assembly line 11 are positioned on the same central line and are positioned between the first scheduling device 1 and the second scheduling device 2, the rolling mill 9 is positioned in the middle, the rolling mill outlet assembly line 10 is positioned at the right side of the rolling mill 9 and is matched with the second scheduling device 2, the rolling mill inlet assembly line 11 is positioned at the left side of the rolling mill 9 and is matched with the first scheduling device 1, and the central lines of the rolling mill 9, the rolling mill outlet assembly line 10 and the rolling mill inlet assembly line 11 are aligned with the central lines of the left side rails of the first dispatching device 1 and the second dispatching device 2, the height positions of the rolling mill outlet assembly line 10 and the rolling mill inlet assembly line 11 are the same, and in the middle of the upper and lower guide rails of the first dispatching device 1, the rolling center line of the rolling mill 9 is aligned with the center lines of the mandrels 3 transported by the rolling mill outlet assembly line 10 and the rolling mill inlet assembly line 11, and the right side of the rolling mill outlet assembly line 10 is provided with an assembly line mandrel locking device 7 and a mandrel left and right limiting rolling device 8.

When the core rod 3 is pressed against the assembly line core rod locking device 7, and the assembly line core rod locking device 7 locks the left groove of the core rod 3, the right groove on the core rod 3 is aligned with the left guide projection 233 and the right guide projection 234 on the scheduling limiting device 23 on the second scheduling device 2, so that the scheduling limiting device 23 can accurately lock the core rod 3 when moving upwards, and the core rod 3 is driven to move upwards by the scheduling limiting device.

The core rod 3 comprises a core rod rotating shaft 31, a core rod sleeve 32, a first dividing outer ring 33, a second dividing outer ring 34, a third dividing outer ring 35, a fourth dividing outer ring 36, a fifth dividing outer ring 37, a sixth dividing outer ring 38 and a tension spring 39, the first dividing outer ring 33, the second dividing outer ring 34, the third dividing outer ring 35, the fourth dividing outer ring 36, the fifth dividing outer ring 37 and the sixth dividing outer ring 38 respectively comprise an outer ring guide post 331, an outer ring limit ring 332, an outer ring top ball 333 and a first tension spring ring 334, the core rod rotating shaft 31 comprises a first flat gear 311, a right limit spherical groove 312, a rotating shaft 313, a middle groove 314, a middle spherical groove 315, a second flat gear 316 and a left limit spherical groove 317, the core rod sleeve 32 comprises a right shaft sleeve 321, a right side groove 322, a sleeve 323, an outer ring guide post hole 324, a second tension spring ring 325, a left shaft sleeve 326, a left side groove 329, a first core rod locking hole 327 and a second core rod locking hole 328, a rotating shaft 313 on the mandrel rotating shaft 31 is rotatably arranged in a central hole of the mandrel sleeve 32, 6 right limiting spherical grooves 312, a middle spherical groove 315 and a left limiting spherical groove 317 on the mandrel rotating shaft 31 are uniformly arranged on the diameter of the same height, 6 outer ring guide holes 324, a second tension spring ring 325, a first mandrel locking hole 327 and a second mandrel locking hole 328 on the mandrel sleeve 32 are uniformly arranged on the diameter of the same height, an outer ring guide hole 331 on a first divided outer ring 33, a second divided outer ring 34, a third divided outer ring 35, a fourth divided outer ring 36, a fifth divided outer ring 37 and a sixth divided outer ring 38 is slidably connected on the outer ring guide hole 324 on the mandrel sleeve 32, the diameter of the outer ring guide hole 324 is slightly larger than that of the outer ring guide post 331, an outer ring top ball 333 is pressed against the middle groove 314, two ends of a tension spring 39 are respectively connected on the second tension spring ring 325 and a tension spring ring 334, the cross-sectional shape of the outer ring part of the first split outer ring 33 is small outside and large inside, and is in a convex shape, the right side surface of the second split outer ring 34 is in contact with the left side surface of the first split outer ring 33, the cross-sectional shape is large outside and small inside, the left side surface of the third split outer ring 35 is in contact with the right side surface of the first split outer ring 33, the cross-sectional shape is large outside and small inside, the rest of the fourth split outer ring 36, the fifth split outer ring 37 and the sixth split outer ring 38 are divided uniformly, the right side of the fourth split outer ring 36 is in contact with the left side of the second split outer ring 34, the right side of the fifth split outer ring 37 is in contact with the left side of the fourth split outer ring 36, the sixth split outer ring 38 is in contact with the left side of the fifth split outer ring 37, and the left side of the sixth split outer ring 35 is in contact with the right side of the third split outer ring.

When the outer ring jacking ball 333 is jacked on the middle groove 314, the outer ring limiting ring 332 is jacked on the inner wall of the mandrel sleeve 32, the first split outer ring 33, the second split outer ring 34, the third split outer ring 35, the fourth split outer ring 36, the fifth split outer ring 37 and the sixth split outer ring 38 are mutually jacked, at the moment, the whole mandrel 3 is in a tensioning state, and when the outer diameter is maximum, the mandrel rotating shaft 31 is rotated, so that the outer ring jacking ball 333 is jacked on the middle spherical groove 315 under the action of the tension spring 39, at the moment, the first split outer ring 33 slides downwards, so that the outer ring has a mouth, because the diameter of the outer ring guide post hole 324 is slightly larger than that of the outer ring guide post 331, and because all the split outer rings are connected with the tension spring 29, the second split outer ring 34, the third split outer ring 35, the fourth split outer ring 36, the fifth split outer ring 37 and the sixth split outer ring 38 incline towards the first split outer ring 33, the outer diameter of the entire mandrel 3 becomes small, so that the mandrel can be easily taken out after the steel pipe is rolled.

The right shaft sleeve 321 and the left shaft sleeve 326 of the core rod sleeve 32 include a first spring hole 3211, a first compression spring 3212 and a first ball 3213 therein, two ends of the first compression spring 3212 are respectively pressed at the bottom of the first spring hole 3211 and the surface of the first ball 3213, the first ball 3213 is pressed at the surface of the rotating shaft 313 of the core rod rotating shaft 31, the relative position of the first spring hole 3211 and the outer ring guide post hole 324 form an included angle of 30 degrees, and the relative positions of the right limit spherical groove 312, the middle spherical groove 315 and the left limit spherical groove 317 on the core rod rotating shaft 31 are on the same axis.

Therefore, the core rod 3 can be in a tensioning state and can have a locking point, so that the core rod cannot be unlocked and tensioned randomly.

The first dispatching device 1 comprises an annular guide rail 21, a chain 22, a rack plate 24, a dispatching limiting device 23, a chain wheel 25, a motor 26 and a dispatching base 27, wherein the chain wheel 25 is arranged on the motor 26, the motor 26 and the annular guide rail 21 are arranged on the dispatching base 27, the chain wheel 25 is connected with the chain 22 in a matching mode, the annular guide rail 21 comprises a U-shaped annular rail 212 and an annular sealing plate 213, the chain 22 is arranged in the U-shaped annular rail 212 of the annular guide rail 21 in a sliding mode, the chain 22 comprises an extension shaft 221, the annular sealing plate 213 is arranged on an opening of the U-shaped annular rail 212, a sliding rail groove for the extension shaft 221 is formed in the annular sealing plate 213, the rack plate 24 is arranged at a position below the upper portion of the annular guide rail 21, and the dispatching limiting device 23 is connected to the extension shaft 221 of a bag of the chain 22 in a rotating mode.

The scheduling limiting device 23 includes a first rotating hole 231, a first notch 232, a left guiding protrusion 233, a right guiding protrusion 234, a second compression spring 235 and a second marble 236, wherein the middle positions of the left guiding protrusion 233 and the right guiding protrusion 234 are respectively provided with a second spring hole 237, two ends of the second compression spring 235 are respectively pressed and contacted with the bottom of the second spring hole 237 and the surface of the second marble 236, the size of the first notch 232 is consistent with that of a right shaft sleeve 321 and a left shaft sleeve 326 on the core rod 3, and the left guiding protrusion 233 and the right guiding protrusion 234 can be connected with a right groove 322 and a left groove 329 on the core rod 3 in a matching manner.

When the right shaft sleeve 321 or the left shaft sleeve 326 on the core rod 3 is matched and connected in the first notch 232 on the dispatching limiting device 23, the left guide convex block 233 and the right guide convex block 234 on the dispatching limiting device 23 clamp the right groove 322 or the left groove 329 on the core rod 3, the second marble 236 on the dispatching limiting device 23 is pressed against the first core rod locking hole 327 or the second core rod locking hole 328 on the core rod 3, so that the core rod 3 is locked on the dispatching limiting device 23, the core rod 3 is statically locked at the left side of the core rod circulating assembly line 6, the dispatching limiting device 23 on the first dispatching device 1 rotates along with the chain, clockwise moves around the annular guide rail 21, the core rod 3 is upwards clamped, the core rod 3 is locked, the core rod 3 moves clockwise around the annular guide rail 21 along with the dispatching limiting device 23, and when the position height of the blank tube feeding assembly line 5 is reached, triggering the inductive switch, starting the piping assembly line 5, sleeving the blank tube 4 on the assembly line on the mandrel 3, triggering the detection switch after sleeving the blank tube 4 on the mandrel 3, driving the mandrel 3 and the blank tube 4 to move clockwise along the annular guide rail 21 by the scheduling limiting device 23, when the blank tube 4 moves above the annular track, engaging the first pinion 311 on the mandrel 3 with the rack plate 24 on the first scheduling device 1, because the mandrel moves clockwise along the annular guide rail 21 at the moment, the rack plate 24 is fixedly arranged on the annular guide rail 21, so that the two move relatively, and the first pinion 311 rotates, thereby realizing the relative rotation of the mandrel rotating shaft 31 and the mandrel sleeve 32 of the mandrel 3, and when the outer ring jacking ball 333 on the mandrel 3 is jacked on the middle groove 314, the outer ring limiting ring 332 is jacked on the inner wall of the mandrel sleeve 32, and the outer ring 33 of the first split outer ring 33, The second outer dividing ring 34, the third outer dividing ring 35, the fourth outer dividing ring 36, the fifth outer dividing ring 37 and the sixth outer dividing ring 38 are mutually butted, and the whole core rod 3 is in a tensioning state.

The production line mandrel locking device 7 comprises a left fixing plate 71, a right fixing plate 72, a locking device roller 73, a locking bridge 74, a third compression spring 75 and a square shaft locking frame 76, wherein the locking device roller 73 is rotatably arranged at the right end of the locking bridge 74, the square shaft locking frame 76 comprises an annular buckle 761, a square shaft 762 and a square shaft limiting plate 762, the locking bridge 74 comprises a left bridge plate 741, a right bridge plate 742, a bridge plate connecting plate 743, a square guide hole 744 and a bridge rotating rod 745, the square shaft 762 of the square shaft locking frame 76 is slidably arranged in the square guide hole 744 of the locking bridge 74, the third compression spring 75 is slidably arranged on the square shaft 762, the two ends of the square shaft locking bracket 76 respectively contact the upper surface of the bridge plate connecting plate 743 and the lower surface of the annular buckle 761, the upper surface of the square shaft limiting plate 762 on the square shaft locking bracket 76 contacts the lower surface of the bridge plate connecting plate 743, and the left fixing plate 71 and the right fixing plate 72 are respectively rotatably arranged on the left side and the right side of the bridge frame rotating rod 745.

When the mandrel 3 is pressed against the locking device roller 73, the other end of the locking bridge 74 tilts upwards under the action of the lever, the square shaft locking frame 76 abuts against the mandrel 3, the square shaft locking frame 76 is compressed downwards under the action of the third compression spring 75, when the mandrel 3 moves to the locking position, the square shaft locking frame 76 is aligned with the left groove 329 or the right groove 322 on the mandrel 3, and at the moment, under the action of the third compression spring 75, the annular buckle 761 on the square shaft locking frame 76 slides into the left groove 329 or the right groove 322 on the mandrel 3, so that the mandrel 3 cannot move continuously, and the effect of locking the mandrel 3 is achieved.

The mandrel left-right limiting rolling device 8 comprises a left-right limiting base 81, a gear power shaft 82, a roller device 83, a transition device 84, a first guide shaft 85, a second guide shaft 87, a fourth compression spring 86, a roller device base 89 and a fifth compression spring 88, wherein the gear power shaft 82 comprises a first belt pulley 821, a gear rotating shaft 822, a gear shaft 823, a second belt pulley 824, a first belt 825 and a production line roller 826, the left-right limiting base 81 comprises a left gear shaft support frame 812, a right gear shaft support frame 811, a left guide shaft fixing plate 813 and a right guide shaft fixing plate 814, the gear rotating shaft 822 on the gear power shaft 82 is rotatably arranged on the left gear shaft support frame 812 and the right gear shaft support frame 811, the first belt pulley 821 is arranged at the left end of the gear rotating shaft 822, the gear shaft 823 is arranged at the middle position of the gear rotating shaft 822 and is arranged between the left gear shaft support frame 812 and the gear shaft support frame 811, the assembly line roller 826 is used for self-powering the rollers of all the assembly lines, the second belt pulley 824 is arranged on one side of the assembly line roller 826 and is positioned on the same plane with the first belt pulley 821 on the outer side of the assembly line frame, the first belt pulley 821 is connected with the second belt pulley 824 through the first belt 825, two ends of the first guide shaft 85 and the second guide shaft 87 are respectively arranged on the left guide shaft fixing plate 813 and the right guide shaft fixing plate 814, the roller device base 89 comprises a first guide hole 891, a second guide hole 892, a roller device connecting plate 893, a left connecting plate 894 and a top connecting plate 895, the transition device 84 comprises a transition flat gear 841, a transition flat gear shaft 842 and a first bevel gear 843, the transition flat gear shaft 842 is rotatably arranged on the left connecting plate 894, the transition flat gear 841 is arranged at the left end of the transition flat gear shaft 842, the first bevel gear 843 is arranged at the right end of the transition flat gear shaft 842, and to the right of the left side web 894, the roller device 83 includes a spacing roller 831, a spacing roller shaft 832 and a second bevel gear 833, the spacing roller shaft 832 of the roller device 83 is rotatably disposed on the upper top web 895 of the roller device base 89, the spacing roller 831 is disposed on the upper end of the spacing roller shaft 832, the second bevel gear 833 is disposed on the lower end of the spacing roller shaft 832, and is engaged with the first bevel gear 843 below the top connection plate 895, the first guide hole 891 and the second guide hole 892 of the roller device base 89 are slidably provided on the first guide shaft 85 and the second guide shaft 87, respectively, and the transition pinion shaft 842 of the transition device 84 is engaged with the pinion shaft 823 of the gear power shaft 82, the fourth compression spring 86 and the fifth compression spring 88 are respectively slidably provided on the first guide shaft 85 and the second guide shaft 87, and both ends are contacted on the right side of the left guide shaft fixing plate 813 and the left side of the roller device base 89.

Wherein can make roller device 83 can be about spacing base 81 go up the horizontal slip like this, and can also fall the power transmission on the assembly line and give roller device 83, make spacing gyro wheel 831 also have the rotation power, can drive plug or pipe back-and-forth movement, spacing rolling device 8 about this plug all sets up in the assembly line left and right sides, can make plug or pipe when not being on the central line, draw close to the central line under compression spring's effect through the spacing gyro wheel 831 of both sides, can also provide power for plug or pipe, when preventing to skid at the bottom gyro wheel, continue to move with the help of the power on spacing gyro wheel 831.

The working principle or the using method is as follows:

firstly, when the mandrel 3 is in an unlocked state, the mandrel 3 is horizontally laid on the mandrel circulating assembly line 6 and moves towards the first dispatching device 1 on the mandrel circulating assembly line 6, firstly, the mandrel 3 is adjusted to a central position through the left and right mandrel limiting rolling devices 8 arranged on the left and right sides of the mandrel circulating assembly line 6, then the mandrel 3 is pressed and contacted with the locking device roller 73 on the mandrel locking device 7 of the assembly line, under the action of a lever, the other end of the locking bridge 74 is tilted upwards, the square shaft locking frame 76 is propped against the outer ring of the mandrel 3, the square shaft locking frame 76 is compressed downwards by the third compression spring 75, at the moment, the mandrel 3 continues to move, when the mandrel 3 moves to a locking position, at the moment, the square shaft locking frame 76 is aligned with the right groove 322 on the mandrel 3, at the moment, under the action of the third compression spring 75, the annular buckle 761 on the square shaft locking frame 76 slides into the right groove 322 on the mandrel 3, so that the mandrel 3 cannot move continuously, at this time, the left side groove 329 on the mandrel 3 is aligned with the left guide bump 233 and the right guide bump 234 on the scheduling limiting device 23 on the first scheduling device 1, at this time, the sensor on the first scheduling device 1 receives a signal, the motor 26 is turned on, the chain starts to rotate, the scheduling limiting device 23 rotates along with the chain, the mandrel 3 moves clockwise around the annular guide rail 21, the mandrel 3 enters the locking position from the upper end opening of the scheduling limiting device 23, the mandrel 3 is clamped, the mandrel 3 is locked, the mandrel 3 moves clockwise around the annular guide rail 21 along with the scheduling limiting device 23, when the position of the blank tube feeding assembly line 5 is reached, the induction switch is triggered, the tubing assembly line 5 is started, the blank tube 4 on the assembly line is sleeved on the mandrel 3, and when the blank tube 4 is completely sleeved on the mandrel 3, the detection switch is triggered, the dispatching and limiting device 23 drives the mandrel 3 and the blank tube 4 to move clockwise along the annular guide rail 21, when the mandrel runs above the annular track, the second flat gear 316 on the mandrel 3 is meshed with the rack plate 24 on the first dispatching device 1, because the mandrel is moving clockwise along the annular guide rail 21 at the moment, the rack plate 24 is fixedly arranged on the annular guide rail 21, and the two move relatively, so that the second flat gear 316 rotates, the mandrel rotating shaft 31 of the mandrel 3 and the mandrel sleeve 32 rotate relatively, the outer ring jacking ball 333 on the mandrel 3 is propped against the middle groove 314, the outer ring limiting ring 332 is propped against the inner wall of the mandrel sleeve 32, the first outer dividing ring 33, the second outer dividing ring 34, the third outer dividing ring 35, the fourth outer dividing ring 36, the fifth outer dividing ring 37 and the sixth outer dividing ring 38 are mutually propped against each other, and the whole mandrel 3 is in a tensioning state, the core rod is in a locked state at this time.

And then the mandrel 3 continues to move clockwise around the annular guide rail 21 along with the dispatching limiting device 23, when the mandrel 3 contacts the rolling mill feeding assembly line 11, the dispatching limiting device 23 continues to move clockwise, and the mandrel 3 is pressed on the rolling mill feeding assembly line 11, so that the mandrel 3 leaves from the upper end opening of the dispatching limiting device 23, the mandrel 3 is unlocked, and the mandrel 3 can move in the rolling mill feeding assembly line 11.

Then the mandrel 3 drives the blank tube 4 to move in the rolling mill assembly line 11, firstly the mandrel 3 is adjusted to the central position through a mandrel left and right limiting rolling device 8 arranged on the left and right of the rolling mill assembly line 11, then the mandrel 3 drives the blank tube 4 to enter the rolling mill 9 to perform the rolling work of the pipeline, the mandrel 3 flows out of the rolling mill assembly line 10 together after the rolling is finished, firstly the mandrel 3 is adjusted to the central position through the mandrel left and right limiting rolling device 8 arranged on the left and right of the rolling mill assembly line 10, then the mandrel 3 is pressed and contacted with a locking device roller 73 on the mandrel locking device 7 of the assembly line, under the action of a lever, the other end of the locking bridge 74 tilts upwards, a square shaft locking frame 76 is pressed against the outer ring of the mandrel 3, the square shaft locking frame 76 is compressed downwards by a third compression spring 75, at the moment, the mandrel 3 continues to move, at the moment, when the mandrel 3 moves to the locking position, the square shaft locking frame 76 is aligned with a left groove 329 on the mandrel 3, at this time, under the action of the third compression spring 75, the annular buckle 761 on the square shaft locking bracket 76 slides into the left side groove 329 on the mandrel 3, so that the mandrel 3 cannot move any further, at this time, the 3 right side groove 322 on the mandrel is aligned with the left guide projection 233 and the right guide projection 234 on the scheduling stop device 23 on the second scheduling device 2, at this time, the sensor on the second scheduling device 2 receives a signal, the motor is turned on, the chain starts to rotate, the scheduling stop device 23 rotates along with the chain, clockwise moves around the annular rail 21, the mandrel 3 enters a locking position from the upper end opening of the scheduling stop device 23, and is clamped with the mandrel 3, so that the mandrel 3 is locked, so that the mandrel 3 follows the scheduling stop device 23 to move clockwise around the annular rail 21, when moving above the annular rail, the first flat gear 311 on the mandrel 3 is engaged with the rack plate 24 on the second scheduling device 2, since the mandrel is now moving clockwise along the ring rail 21, the rack plate 24 is fixedly arranged on the ring rail 21, so that the two move relatively to each other, and the first flat gear 311 rotates, so that the mandrel rotating shaft 31 of the mandrel 3 and the mandrel sleeve 32 rotate relatively to each other, the outer ring pushing ball 333 is pushed against the middle spherical groove 315 by the tension spring 39, at this time, the first outer ring 33 slides downwards, so that the outer ring forms a notch, because the diameter of the outer ring guide post hole 324 is slightly larger than that of the outer ring guide post 331, and because all the divided outer rings are connected with the tension springs 29, therefore, the second split outer ring 34, the third split outer ring 35, the fourth split outer ring 36, the fifth split outer ring 37, and the sixth split outer ring 38 are all inclined toward the first split outer ring 33, so that the outer diameter of the entire mandrel 3 becomes small, and the mandrel 3 is in the unlocked state.

Then the core rod 3 carries the finished product pipe 12 to continue to move clockwise around the annular guide rail 21 along with the dispatching limiting device 23, when the core rod 3 and the finished product pipe 12 contact the core rod circulating assembly line 6, the induction switch is pressed to enable the second dispatching device 2 to stop running, at the moment, the core rod circulating assembly line 6 is started, because the core rod 3 is in an unlocking state at the moment, the outer diameter of the core rod 3 is reduced, the finished product pipe 12 can be easily separated from the core rod 3, at the moment, the core rod 3 is also locked on the dispatching limiting device 23, the finished product pipe 12 contacts a rotating roller on the core rod circulating assembly line 6, under the action of the rotating roller and a core rod left and right limiting rolling device 8, the finished product pipe 12 is separated from the core rod 3, because a hollow block with the length larger than the finished product pipe 12 on the right side of the core rod circulating assembly line 6 and smaller than the core rod 3 is arranged in the middle of the core rod circulating assembly line 6, and the hollow block is an outflow port of the finished product pipe 12, when the finished product pipe 12 passes through the neutral gear, the finished product pipe slides downwards to achieve the purpose of automatic discharging, the inductive switch is triggered in the sliding process, so that the second scheduling device 2 continues to operate, the scheduling limiting device 23 continues to move clockwise, and the core rod 3 is pressed on the core rod circulating assembly line 6, so that the core rod 3 leaves from an upper end opening of the scheduling limiting device 23, the core rod 3 is unlocked, the core rod 3 can move on the core rod circulating assembly line 6, the core rod 3 automatically returns to an initial state, and an automatic cycle is achieved.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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 (2)

1. A mandrel automatic circulating device for a rolling mill comprises a first scheduling device (1), a second scheduling device (2), a mandrel (3), a blank pipe (4), a blank pipe feeding assembly line (5), a mandrel circulating assembly line (6), an assembly line mandrel locking device (7), a mandrel left and right limiting rolling device (8), a rolling mill (9), a rolling mill outlet assembly line (10), a rolling mill feeding assembly line (11) and a finished product pipe (12), wherein the first scheduling device (1), the second scheduling device (2) and the rolling mill (9) are all arranged on the ground, and the first scheduling device (1) and the second scheduling device (2) are arranged in opposite directions;

the left side of the mandrel circulating assembly line (6) is provided with an assembly line mandrel locking device (7), the left and right sides of the left and right racks are respectively provided with a mandrel left and right limiting rolling device (8), the middle of the right side is provided with a segment of neutral gear with the length being more than that of a finished product pipe (12) and less than that of a mandrel (3), the neutral gear is an outflow port of the finished product pipe (12), the mandrel circulating assembly line (6) is arranged at the middle position of the first scheduling device (1) and the second scheduling device (2), and the central line of the mandrel circulating assembly line (6) is aligned with the central lines of right side tracks of the first scheduling device (1) and the second scheduling device (2);

the distance between a leftmost roller of the blank pipe feeding assembly line (5) and the first scheduling device (1) is greater than the length of the mandrel (3), a left mandrel and right mandrel limiting rolling device (8) is arranged on a left rack, the blank pipe feeding assembly line (5) is positioned right above the mandrel circulating assembly line (6), and the height position of the blank pipe feeding assembly line is lower than a track above the first scheduling device;

the rolling mill (9) is positioned between the rolling mill outlet assembly line (10) and the rolling mill inlet assembly line (11), the rolling mill outlet assembly line (10) and the rolling mill inlet assembly line (11) are positioned on the same central line and are positioned between the first scheduling device (1) and the second scheduling device (2), the rolling mill outlet assembly line (10) is positioned on the right side of the rolling mill (9) and is matched with the second scheduling device (2), the rolling mill inlet assembly line (11) is positioned on the left side of the rolling mill (9) and is matched with the first scheduling device (1), the central lines of the rolling mill (9), the rolling mill outlet assembly line (10) and the rolling mill inlet assembly line (11) are aligned with the central lines of the left tracks of the first scheduling device (1) and the second scheduling device (2), the height positions of the rolling mill outlet assembly line (10) and the rolling mill inlet assembly line (11) are the same, and the central line of the rolling mandrel (3) transported by the rolling mill outlet assembly line (10) and the rolling mill inlet assembly line (11) is aligned between the upper guide rail and the lower rail of the first scheduling device (1), a production line mandrel locking device (7) and a mandrel left and right limiting rolling device (8) are arranged on the right side of the production line (10) of the rolling mill;

the core rod (3) comprises a core rod rotating shaft (31), a core rod sleeve (32), a first dividing outer ring (33), a second dividing outer ring (34), a third dividing outer ring (35), a fourth dividing outer ring (36), a fifth dividing outer ring (37), a sixth dividing outer ring (38) and a tension spring (39), the core rod rotating shaft (31) comprises a first flat gear (311), a right limiting spherical groove (312), a rotating shaft (313), a middle groove (314), a middle spherical groove (315), a second flat gear (316) and a left limiting spherical groove (317), the first flat gear (311) and the second flat gear (316) are respectively positioned at two ends of the core rod rotating shaft (31), the core rod sleeve (32) comprises a right shaft sleeve (321), a right groove (322), a sleeve (323), an outer ring guide column hole (324), a second tension spring ring (325), a left shaft sleeve (326), a left groove (329), The core rod comprises a first core rod locking hole (327) and a second core rod locking hole (328), a right shaft sleeve (321) and a left shaft sleeve (326) of a core rod sleeve (32) are internally provided with a first spring hole (3211), a first compression spring (3212) and a first marble (3213), two ends of the first compression spring (3212) are respectively pressed and contacted with the bottom of the first spring hole (3211) and the surface of the first marble (3213), the first marble (3213) is pressed and contacted with the surface of a rotating shaft (313) of a core rod rotating shaft (31), the relative position of the first spring hole (3211) and the outer ring guide post hole (324) form an included angle of 30 degrees, the relative positions of a right limiting spherical groove (312), a middle spherical groove (315) and a left limiting spherical groove (317) on the core rod rotating shaft (31) are on the same axial line, a first dividing outer ring (33), a second dividing outer ring (34), a third dividing outer ring (35), a fourth dividing outer ring (36), The fifth outer dividing ring (37) and the sixth outer dividing ring (38) respectively comprise an outer ring guide post (331), an outer ring limit ring (332), an outer ring top ball (333) and a first tension spring ring (334), a rotating shaft (313) on the mandrel rotating shaft (31) is rotatably arranged in a central hole of the mandrel sleeve (32), 6 right limit spherical grooves (312), 6 middle spherical grooves (315) and 6 left limit spherical grooves (317) on the mandrel rotating shaft (31) are uniformly arranged in the circumferential direction at the same height, 6 outer ring guide post holes (324), 6 second tension spring rings (325), a first mandrel locking hole (327) and a second mandrel locking hole (328) on the mandrel sleeve (32) are uniformly arranged in the circumferential direction at the same height, and the guide posts (331) on the first outer dividing ring (33), the second outer dividing ring (34), the third outer dividing ring (35), the fourth outer dividing ring (36), the fifth outer dividing ring (37) and the sixth outer dividing ring (38) are slidably connected to the outer ring guide post (331) on the mandrel sleeve (32) On an outer ring guide post hole (324), the diameter of the outer ring guide post hole (324) is slightly larger than that of an outer ring guide post (331), an outer ring jacking ball (333) is propped against the middle groove (314), two ends of a tension spring (39) are respectively connected onto a second tension spring ring (325) and a first tension spring ring (334), the section of the outer ring part of a first split outer ring (33) is small outside and large inside, the section of a second split outer ring (34) and a third split outer ring (35) are large outside and small inside, a fourth split outer ring (36), a fifth split outer ring (37) and a sixth split outer ring (38) are uniformly split, the right side surface of the second split outer ring (34) is contacted with the left side surface of the first split outer ring (33), the left side surface of the third split outer ring (35) is contacted with the right side surface of the first split outer ring (33), and the right side of the fourth split outer ring (36) is contacted with the left side surface of the second split outer ring (34), the right side of the fifth division outer ring (37) is in contact with the left side of the fourth division outer ring (36), the right side of the sixth division outer ring (38) is in contact with the left side of the fifth division outer ring (37), and the left side of the sixth division outer ring is in contact with the right side of the third division outer ring (35);

the first dispatching device (1) comprises an annular guide rail (21), a chain (22), a rack plate (24), a dispatching limiting device (23), a chain wheel (25), a motor (26) and a dispatching base (27), wherein the dispatching limiting device (23) comprises a first rotating hole (231), a first notch (232), a left guiding convex block (233), a right guiding convex block (234), a second compression spring (235) and a second marble (236), the middle positions of the left guiding convex block (233) and the right guiding convex block (234) are respectively provided with a second spring hole (237), two ends of the second compression spring (235) are respectively pressed and contacted at the bottom of the second spring hole (237) and the surface of the second marble (236), the size of the first notch (232) is consistent with that of a right shaft sleeve (321) and a left shaft sleeve (326) on a core rod (3), the first notch can be matched and connected with the right shaft sleeve or the left shaft sleeve, and the left guiding convex block (233) and the right guiding convex block (234) can be matched with a right groove (322) on the core rod (3) and a left groove (322) on the core rod (3) The side grooves (329) are connected in a matched mode, the motor (26) and the annular guide rail (21) are arranged on the dispatching base (27), the chain wheel (25) is arranged on the motor (26), the chain wheel (25) is connected with the chain (22) in a matched mode, the annular guide rail (21) comprises a U-shaped annular track (212) and an annular sealing plate (213), the chain (22) is arranged in the U-shaped annular track (212) of the annular guide rail (21) in a sliding mode, the chain (22) comprises an extension shaft (221), the annular sealing plate (213) is arranged on an opening of the U-shaped annular track (212), a sliding track groove of the extension shaft (221) is formed in the annular sealing plate (213), the rack plate (24) is arranged at the position below the upper portion of the annular guide rail (21), and the dispatching limiting device (23) is connected to the extension shaft (221) on the chain (22) in a rotating mode;

the assembly line mandrel locking device (7) comprises a left fixing plate (71), a right fixing plate (72), a locking device roller (73), a locking bridge frame (74), a third compression spring (75) and a square shaft locking frame (76), wherein the square shaft locking frame (76) comprises an annular buckle (761), a square shaft (762) and a square shaft limiting plate (763), the locking bridge frame (74) comprises a left bridge plate (741), a right bridge plate (742), a bridge plate connecting plate (743), a square guide hole and a bridge frame (745), the locking device roller (73) is rotatably arranged at the right ends of the left bridge plate (741) and the right bridge plate (742), the square shaft (762) of the square shaft locking frame (76) is slidably arranged in the square guide hole (744) of the locking bridge frame (74), two ends of the third compression spring (75) respectively abut against the upper surface of the bridge plate connecting plate (743) and the lower surface of the annular buckle (761), and the upper surface of a square shaft limiting plate (763) on the square shaft locking frame (76) is in top contact with the lower surface of a bridge plate connecting plate (743), and a left fixing plate (71) and a right fixing plate (72) are respectively and rotatably arranged on the left side and the right side of the bridge frame rotating rod (745).

2. The automatic mandrel bar circulating device for a rolling mill according to claim 1, wherein: the mandrel left and right limiting rolling device (8) comprises a left and right limiting base (81), a gear power shaft (82), a roller device (83), a transition device (84), a first guide shaft (85), a second guide shaft (87), a fourth compression spring (86), a roller device base (89) and a fifth compression spring (88), wherein the left and right limiting base (81) comprises a right gear shaft support frame (811), a left gear shaft support frame (812), a left guide shaft fixing plate (813) and a right guide shaft fixing plate (814), the gear power shaft (82) comprises a first belt wheel (821), a gear rotating shaft (822), a gear shaft (823), a second belt wheel (824), a first belt (825) and a production line roller (826), the production line roller (826) is a roller which is carried by all production lines, and is provided with power, the second belt wheel (824) is arranged on one side of the production line roller (826), and the outer side of the assembly line frame is positioned on the same plane with the first belt pulley (821), the first belt pulley (821) is connected with the second belt pulley (824) through a first belt (825), the first belt pulley (821) is arranged at the left end of the gear rotating shaft (822), the gear shaft (823) is arranged at the middle position of the gear rotating shaft (822), the gear rotating shaft (822) on the gear power shaft (82) is rotatably arranged on the left gear shaft supporting frame (812) and the right gear shaft supporting frame (811), two ends of the first guide shaft (85) and the second guide shaft (87) are respectively arranged on the left guide shaft fixing plate (813) and the right guide shaft fixing plate (814), the transition device (84) comprises a transition flat gear (841), a transition flat gear shaft (842) and a first bevel gear (843), and the roller device base (89) comprises a first guide hole (891), a second guide hole (892), Roller device connecting plate (893), left side connecting plate (894) and top connecting plate (895), excessive flat gear axle (842) rotates and sets up on left side connecting plate (894), roller device (83) includes spacing gyro wheel (831), spacing roller axle (832) and second bevel gear (833), spacing roller axle (832) on roller device (83) rotate and set up on last top connecting plate (895) of roller device base (89), second bevel gear (833) and first bevel gear (843) meshing, first guiding hole (891) and second guiding hole (892) on roller device base (89) slide respectively and set up on first guiding axle (85) and second guiding axle (87), and excessive flat gear axle (842) on excessive device (84) and gear axle (823) on gear power axle (82) meshing, the both ends of fourth compression spring (86) and fifth compression spring (88) touch at left guiding axle dead plate (813) right side and roller device bottom pressure-equalizing plate (813) of left side guiding axle The left side of the seat (89) is respectively arranged on the first guide shaft (85) and the second guide shaft (87) in a sliding way.

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