A piercing device for low-carbon steel pipes

Abstract

The present invention discloses a piercing device for low-carbon steel pipes, which relates to the technical field of low-carbon steel pipe production and includes a piercing assembly. It is characterized in that the piercing assembly includes bearing seats, barrel-shaped rolling rolls, motors, sprockets, chains and ball-headed rods. Barrel-shaped rolling rolls are rotatably installed inside the bearing seats at both the upper and lower ends, and a motor is connected to the outside of the barrel-shaped rolling roll at the lower end. Sprockets are coaxially connected to the inner sides of the barrel-shaped rolling rolls at both the upper and lower ends. During the use of the present invention, the combination of axial movement and reverse rotation in this application constitutes the spiral movement of the workpiece blank, and then under the push of the second oil cylinder on the mandrel, it is axially extruded along the workpiece blank to form a capillary cavity. With the help of a reasonable kinematic design of skew rolling piercing, the workpiece blank entering the piercing station makes a spiral movement combining axial movement and reverse rotation, and cooperates with the extrusion of the mandrel to realize the piercing operation of the workpiece blank. The structure is simple and the production efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-carbon steel pipe production, in particular to a perforating device for low-carbon steel pipes. Background Art

[0002] The production method of low carbon steel pipe mainly includes the steps of perforation, rolling, leveling and sizing. Perforation is the first step in the production of low carbon steel pipe, which is usually carried out by oblique rolling perforator or head perforator. During the perforation process, the tube blank is heated to a high temperature state, and then the initial shape of the steel pipe is formed through the rotation and jacking of the perforator. Then, the steel pipe enters the rolling stage. Through multiple rolling passes, the wall thickness, outer diameter and length of the steel pipe meet the predetermined requirements. During the rolling process, the steel pipe also needs to be leveled to eliminate internal and external defects of the steel pipe and improve the quality of the steel pipe. Finally, the steel pipe enters the sizing stage. Through the sizing and reducing of the sizing machine, the outer diameter and wall thickness of the steel pipe are made more accurate.

[0003] In the production process of traditional technology, after the tube blank is punched into a hollow rough tube by a piercing machine, it is often sent to a periodic tube rolling mill to press the punched thick-walled rough tube into a thin-walled rough tube to achieve the thermal size and uniformity required by the finished tube. However, in the prior art, the piercing machine and the periodic tube rolling mill are often independent of each other, resulting in the natural cooling of the rough tube during the transfer process, and secondary heating is required to continue the hot rolling process. In addition, each roller of the existing periodic tube rolling mill requires a DC motor to drive, and often needs to cooperate with a feeder to realize the feeding of the rough tube, which has a complex structure and high production cost.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a perforating device for low carbon steel pipes is proposed. Summary of the invention

[0005] The object of the present invention is to provide a perforating device for a low carbon steel pipe to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a perforating device for low carbon steel pipes, comprising a perforating assembly, wherein the perforating assembly comprises a bearing seat, a barrel roller, a motor, a sprocket, a chain and a ball head rod, barrel rollers are rotatably installed inside the bearing seats at the upper and lower ends, and the outer side of the barrel roller at the lower end is connected to a motor, sprockets are coaxially connected to the inner side of the barrel rollers at the upper and lower ends, and the sprockets at the upper and lower ends are rotationally transmitted through a chain, and the inner side of the barrel roller at the upper end is transmission-connected to a ball head rod.

[0007] Furthermore, the barrel-shaped rollers at the upper and lower ends rotate in the same direction, and the axes of the barrel-shaped rollers at the upper and lower ends are inclined relative to the rolling axis.

[0008] Furthermore, the bearing seat is symmetrically fixed on both sides of the front end of the rolling mill body, and a feed support plate is fixedly connected to the front end inlet of the rolling mill body, the feed support plate recess receives the workpiece, and there is an advancement angle between the axis of the workpiece and the axis of the barrel rollers at the upper and lower ends, and the workpiece rotates in the opposite direction driven by the friction force of the barrel rollers at the upper and lower ends.

[0009] Furthermore, a guide cover is fixedly installed on the top of the front end of the rolling mill body, and a slider is slidably installed on the track of the inner wall of the guide cover recess.

[0010] Furthermore, the slider is fixedly connected to an output end of the oil cylinder, and a push plate is fixedly connected to the front end of the bottom of the slider, and the push plate pushes the rolled piece to move axially along the rolling direction.

[0011] Furthermore, a discharging inclined plate is fixedly connected to the rear end outlet of the rolling mill body, and an inclined guide groove is provided on the top plane of the discharging inclined plate.

[0012] Furthermore, a second oil cylinder is bolted to a mounting plate at the rear end of the discharge inclined plate, and a core rod is threadedly connected to an output end of the second oil cylinder, and the core rod is extruded along the axial direction of the rolled piece to form a cavity.

[0013] Furthermore, an end plate is fixedly installed on the top of the rear end of the rolling mill body, and a bidirectional tooth plate with an "L"-shaped structure is fixedly connected to the bottom of the end plate.

[0014] Furthermore, guide rods are fixedly connected on both sides of the end plate, and a reciprocating screw is rotatably installed in the middle of the end plate. The surface of the reciprocating screw is provided with two thread grooves with the same pitch and opposite rotation direction, and the two ends are connected by a transition curve, and the end of the reciprocating screw is connected to the ball head rod for rotation transmission through a ball head seat.

[0015] Furthermore, a periodic tube rolling assembly is threadedly connected to the middle part of the reciprocating screw rod, and the periodic tube rolling assembly includes a sliding seat, a sliding pin, a guide hole, a body, an I-shaped roller and a gear. A sliding pin is provided at the top of the through hole in the middle part of the sliding seat, and the sliding pin is located in the thread groove on the surface of the reciprocating screw rod for axial reciprocating motion. Guide holes are symmetrically provided on both sides of the sliding seat, and the guide holes are slidably matched with the corresponding guide rods. A body is fixedly installed at the bottom of the sliding seat, and I-shaped rollers are rotatably installed at the upper and lower ends of the body, and the depth of the groove in the I-shaped roller changes from deep to shallow. The I-shaped roller is located outside the body and is coaxially connected to a gear, and the gear is respectively meshed with the teeth at both ends of the bidirectional tooth plate for transmission.

[0016] The present invention provides a perforating device for a low carbon steel pipe, which has the following beneficial effects:

[0017] 1. During the use of the present invention, in the present application, a linkage design is adopted between the piercing component and the pilger rolling component. On the one hand, while the motor provides synchronous rotation power for the upper and lower barrel-shaped rolls, the upper barrel-shaped roll further provides power transmission to the reciprocating screw rod through the ball head rod, enabling the sliding seat to drive the machine body to perform axial reciprocating motion. In addition, the periodic rotation of the I-shaped rolls at both ends inside the machine body is driven by the meshing of the gear with the tooth profiles at both ends of the double-sided toothed plate. Furthermore, the rolling of the tube blank is realized through the periodic rotation and reciprocating motion of the I-shaped rolls. The use of the core head still follows the mandrel in the piercing component to reduce the assembly cost. It can be seen that in the design scheme of the pilger rolling component of the present application, firstly, a feeder is not required to realize the axial feeding of the tube blank; secondly, a crank connecting rod mechanism is not required to realize the reciprocating motion of the machine body; and finally, a motor is not required to drive the periodic rotation of the I-shaped rolls. This not only enables the piercing and rolling operations of the rolled piece blank of the present application to be carried out continuously without the need for secondary heating during the transfer process, but also the power sources of the pilger rolling component all come from the power conduction of the motor in the piercing component, effectively reducing the production cost and improving the linkage effect of the device;

[0018] 2. During the use of the present invention, in the present application, the combination of axial movement and reverse rotation constitutes the spiral movement of the rolled piece blank, and then under the push of the second oil cylinder on the mandrel, it is axially extruded along the rolled piece blank to form a tube blank cavity. With the help of a reasonable kinematic design of skew rolling piercing, the rolled piece blank entering the piercing station performs a spiral movement combining axial movement and reverse rotation, and cooperates with the extrusion of the mandrel to realize the piercing operation of the rolled piece blank, with a simple structure and effectively improved production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall sectional structure schematic diagram of the device of the present invention;

[0020] Figure 2 is the structure schematic diagram of the discharge inclined plate of the present invention;

[0021] Figure 3 is the structure schematic diagram of the feed support plate of the present invention;

[0022] Figure 4 is the overall structure schematic diagram of the piercing component of the present invention;

[0023] Figure 5 is the exploded structure schematic diagram of the piercing component of the present invention;

[0024] Figure 6 is the structure schematic diagram of the end plate of the present invention;

[0025] Figure 7 is the structure schematic diagram of the pilger rolling component of the present invention.

[0026] In the figure: 1. Piercing component; 101. Bearing seat; 102. Barrel-shaped roll; 103. Motor; 104. Sprocket; 105. Chain; 106. Ball head rod; 2. Rolling mill body; 3. Feeding support plate; 4. Workpiece to be rolled; 5. Guide cover; 6. Slide block; 7. First oil cylinder; 8. Pushing plate; 9. Discharge inclined plate; 10. Inclined guide groove; 11. Second oil cylinder; 12. Mandrel; 13. End plate; 14. Double-sided toothed plate; 15. Guide rod; 16. Reciprocating lead screw; 17. Ball head seat; 18. Rotary tube piercing component; 1801. Sliding seat; 1802. Slide pin; 1803. Guide hole; 1804. Machine body; 1805. I-shaped roll; 1806. Gear. Detailed implementation mode

[0027] The following further describes in detail the implementation mode of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0028] Please refer to Figures 1 to 5 , the present invention provides a technical solution: a piercing device for low-carbon steel pipes, including a piercing component 1. The piercing component 1 includes a bearing seat 101, a barrel-shaped roll 102, a motor 103, a sprocket 104, a chain 105 and a ball head rod 106. Barrel-shaped rolls 102 are rotatably installed inside the upper and lower bearing seats 101, and a motor 103 is connected to the outside of the barrel-shaped roll 102 at the lower end. Coaxial sprockets 104 are connected to the inner sides of the upper and lower barrel-shaped rolls 102, and the upper and lower sprockets 104 are rotationally driven by a chain 105. A ball head rod 106 is drivingly connected to the inner side of the upper barrel-shaped roll 102. The upper and lower barrel-shaped rolls 102 rotate in the same direction, and the axes of the upper and lower barrel-shaped rolls 102 are inclined relative to the rolling axis. The bearing seats 101 are symmetrically fixed on both sides of the front end of the rolling mill body 2, and a feeding support plate 3 is fixedly connected to the inlet at the front end of the rolling mill body 2. A workpiece to be rolled 4 is received inside the notch of the feeding support plate 3, and there is an advancing angle between the axis of the workpiece to be rolled 4 and the axes of the upper and lower barrel-shaped rolls 102. The workpiece to be rolled 4 rotates in the opposite direction under the driving of the frictional force of the upper and lower barrel-shaped rolls 102.

[0029] The specific operation is as follows. In this application, the barrel-shaped roll 102 at the lower end is directly driven by the motor 103. Further, the barrel-shaped rolls 102 at the upper and lower ends rotate in the same direction through the transmission of the sprocket 104 and the chain 105. Since the axes of the barrel-shaped rolls 102 at the upper and lower ends are inclined relative to the rolling axis, when the billet 4 of the rolled piece enters between the barrel-shaped rolls 102 at the upper and lower ends, it is driven to rotate in the reverse direction by the frictional force. And because the axes of the barrel-shaped rolls 102 at the upper and lower ends have an advancing angle with respect to the billet 4 of the rolled piece, the billet 4 of the rolled piece moves axially. The combination of the above axial movement and reverse rotation constitutes the spiral movement of the billet 4 of the rolled piece. With the help of a reasonable kinematic design of skew rolling piercing in this application, the billet 4 of the rolled piece entering the piercing station makes a spiral movement combining axial movement and reverse rotation, and cooperates with the extrusion of the mandrel 12 to realize the piercing operation of the billet 4 of the rolled piece. The structure is simple and the production efficiency is effectively improved;

[0030] Please refer to Figures 2 to 3 , a guide cover 5 is fixedly installed at the front top of the rolling mill body 2, and a slider 6 is slidably installed on the track of the inner wall of the notch of the guide cover 5. The slider 6 is fixedly connected to the output end of the first oil cylinder 7, and a pusher plate 8 is fixedly connected to the front end of the bottom of the slider 6. And the pusher plate 8 pushes the rolled piece 4 to move axially along the rolling direction. A discharge inclined plate 9 is fixedly connected to the outlet at the rear end of the rolling mill body 2, and an inclined guide groove 10 is provided on the top plane of the discharge inclined plate 9. An oil cylinder two 11 is bolted to the mounting plate at the rear end of the discharge inclined plate 9, and the output end of the oil cylinder two 11 is threadedly connected to a mandrel 12, and the mandrel 12 extrudes along the axis of the rolled piece 4 to form a cavity;

[0031] The specific operation is as follows. The heated billet 4 of the rolled piece is automatically loaded onto the feeding support plate 3. The first oil cylinder 7 pulls the slider 6 to slide on the track of the inner wall of the notch of the guide cover 5, and then the pusher plate 8 axially pushes the billet 4 of the rolled piece along the rolling direction to the piercing station. Then, under the push of the oil cylinder two 11 on the mandrel 12, it extrudes along the axis of the billet 4 of the rolled piece to form a capillary cavity;

[0032] Please refer to Figures 6 to 7, at the top of the rear end of the rolling mill body 2, an end plate 13 is fixedly installed, and a double-sided toothed plate 14 with an "L" shape is fixedly connected to the bottom of the end plate 13. Guide rods 15 are fixedly connected to both sides of the end plate 13, and a reciprocating lead screw 16 is rotatably installed in the middle of the end plate 13. The surface of the reciprocating lead screw 16 is provided with two thread grooves with the same pitch and opposite helix directions and is connected by transition curves at both ends. The end of the reciprocating lead screw 16 is rotationally connected to the ball head rod 106 through a ball head seat 17. A periodic pipe rolling assembly 18 is threadedly connected to the middle of the reciprocating lead screw 16. The periodic pipe rolling assembly 18 includes a sliding seat 1801, a sliding pin 1802, a guide hole 1803, a body 1804, an I-shaped rolling roll 1805, and a gear 1806. At the top of the through hole in the middle of the sliding seat 1801, a sliding pin 1802 is provided, and the sliding pin 1802 makes an axial reciprocating motion in the thread groove on the surface of the reciprocating lead screw 16. Guide holes 1803 are symmetrically opened on both sides of the sliding seat 1801, and the guide holes 1803 are slidably matched with the corresponding guide rods 15. A body 1804 is fixedly installed at the bottom of the sliding seat 1801, and I-shaped rolling rolls 1805 are rotatably installed at the upper and lower ends inside the body 1804, and the groove depth in the I-shaped rolling rolls 1805 changes from deep to shallow. Gears 1806 are coaxially connected to the outside of the body 1804 for the I-shaped rolling rolls 1805, and the gears 1806 are respectively in meshing transmission with the two ends of the double-sided toothed plate 14;

[0033] The specific operation is as follows. While the barrel-shaped rolling roll 102 at the upper end is rotationally driven by the chain 105, it also rotationally drives the reciprocating lead screw 16 in the middle of the end plate 13 through the ball head rod 106 connected to the inside. During the rotation of the reciprocating lead screw 16, the side of its thread groove pushes the sliding pin 1802 placed therein, thereby driving the sliding seat 1801 to reciprocate between the two guide rods 15. During the process of the sliding seat 1801 driving the machine body 1804 to reciprocate, the I-shaped rolling rolls 1805 at both ends inside the machine body 1804 respectively perform periodic rotation through the engagement of the gears 1806 with the tooth profiles at both ends of the double-sided toothed plate 14. Thus, the rolling of the capillary tube is realized through the periodic rotation and reciprocating motion of the I-shaped rolling rolls 1805. In this application, by linking the piercing assembly 1 and the periodic rolling mill assembly 18, on the one hand, while the motor 103 provides synchronous rotational power for the barrel-shaped rolling rolls 102 at the upper and lower ends, the barrel-shaped rolling roll 102 at the upper end further provides power transmission to the reciprocating lead screw 16 through the ball head rod 106, enabling the sliding seat 1801 to drive the machine body 1804 to perform axial reciprocating motion. In addition, the periodic rotation of the I-shaped rolling rolls 1805 at both ends inside the machine body 1804 is driven by the engagement of the gears 1806 with the tooth profiles at both ends of the double-sided toothed plate 14, and thus the rolling of the capillary tube is realized through the periodic rotation and reciprocating motion of the I-shaped rolling rolls 1805. The use of the core head still follows the mandrel 12 in the piercing assembly 1 to reduce the assembly cost. It can be seen that in the design scheme of the periodic rolling mill assembly 18 of this application, firstly, there is no need for a feeder to realize the axial feeding of the capillary tube. Secondly, there is no need for a crank-link mechanism to realize the reciprocating motion of the machine body 1804. Finally, there is no need for a motor to drive the periodic rotation of the I-shaped rolling rolls 1805. This not only enables the piercing and rolling operations of the workpiece 4 blank in this application to be carried out continuously without the need for secondary heating during the transfer process, but also the power source of the periodic rolling mill assembly 18 all comes from the power conduction of the motor 103 in the piercing assembly 1, effectively reducing the production cost and enhancing the linkage effect of the device.

[0034] It should be noted that: first, the ball head seat 17 and the ball head rod 106 of the present application form a ball fork type universal joint. When designing the ball fork type universal joint, on the one hand, the curved arc grooves of the master / slave fork are combined to form an annular raceway, and the four force-transmitting steel balls are always located on the plane that bisects the angle between the two axes. This design keeps the motion trajectory of the steel balls symmetrical and achieves constant speed of power transmission. On the other hand, the center steel ball is embedded in the grooves of the two forks to prevent the axial deviation of the master / slave fork and ensure the relative position of the rotation axis is stable. This can ensure that the above-mentioned ball fork type universal joint is stable during rotation. Stability in transmission; secondly, the sliding seat 1801 of the present application realizes reciprocation by moving the sliding pin 1802 in the threaded groove on the surface of the reciprocating screw 16, wherein the reciprocating screw 16 is a long rod-shaped object with a spiral pattern on the surface, and the sliding pin 1802 inside the sliding seat 1801 is a part that matches the pattern on the reciprocating screw 16, and can move axially when the reciprocating screw 16 rotates. Since the pitch of the pattern is fixed, the sliding seat 1801 moves axially by a pitch for every rotation of the reciprocating screw 16, thereby realizing reciprocating linear motion.

[0035] In summary, when using this piercing equipment for low-carbon steel pipes, the heated billet 4 of the rolled piece is automatically fed onto the feeding support plate 3. The first oil cylinder 7 pulls the slider 6 to slide on the track on the inner wall of the notch of the guiding cover 5, and then the pushing plate 8 axially pushes the billet 4 of the rolled piece along the rolling direction to the piercing station. In this application, the barrel-shaped rolling rolls 102 at the lower end are directly driven by the motor 103. Further, the barrel-shaped rolling rolls 102 at the upper and lower ends rotate in the same direction through the transmission of the sprocket 104 and the chain 105. Since the axes of the barrel-shaped rolling rolls 102 at the upper and lower ends are inclined relative to the rolling axis, the billet 4 of the rolled piece is driven to rotate in the reverse direction by the frictional force after entering between the barrel-shaped rolling rolls 102 at the upper and lower ends. And because the axes of the barrel-shaped rolling rolls 102 at the upper and lower ends have a forward angle with respect to the billet 4 of the rolled piece, the billet 4 of the rolled piece moves axially again. The combination of the above axial movement and reverse rotation constitutes the spiral movement of the billet 4 of the rolled piece. Then, under the push of the second oil cylinder 11 on the mandrel 12, it is axially extruded along the billet 4 of the rolled piece to form a capillary cavity. This application, with the help of a reasonable kinematic design of skew rolling piercing, enables the billet 4 of the rolled piece entering the piercing station to perform a spiral movement combining axial movement and reverse rotation, and cooperates with the extrusion of the mandrel 12 to realize the piercing operation of the billet 4 of the rolled piece. The structure is simple and the production efficiency is effectively improved. While the barrel-shaped rolling roll 102 at the upper end is driven to rotate by the chain 105, it also transmits power to the reciprocating lead screw 16 in the middle of the end plate 13 through the ball head rod 106 connected to the inside. During the rotation of the reciprocating lead screw 16, the side of its thread groove pushes the sliding pin 1802 placed therein, and then drives the sliding seat 1801 to reciprocate between the two guide rods 15. During the process of the sliding seat 1801 driving the machine body 1804 to reciprocate, the I-shaped rolling rolls 1805 at both ends inside the machine body 1804 respectively rotate periodically through the meshing of the gears 1806 with the tooth profiles at both ends of the double-sided toothed plate 14. Then, through the periodic rotation and reciprocating movement of the I-shaped rolling rolls 1805, the rolling of the capillary is realized. This application, through the linkage design of the piercing assembly 1 and the periodic pipe rolling assembly 18, on the one hand, while the motor 103 provides synchronous rotation power for the barrel-shaped rolling rolls 102 at the upper and lower ends, the barrel-shaped rolling roll 102 at the upper end further transmits power to the reciprocating lead screw 16 through the ball head rod 106, so that the sliding seat 1801 drives the machine body 1804 to perform an axial reciprocating movement. In addition, it also drives the I-shaped rolling rolls 1805 at both ends inside the machine body 1804 to rotate periodically through the meshing of the gears 1806 with the tooth profiles at both ends of the double-sided toothed plate 14. Then, through the periodic rotation and reciprocating movement of the I-shaped rolling rolls 1805, the rolling of the capillary is realized. Among them, the use of the core head still follows the mandrel 12 in the piercing assembly 1 to reduce the assembly cost. It can be seen that in the design scheme of the periodic pipe rolling assembly 18 of this application, firstly, there is no need for a feeder to realize the axial feeding of the capillary. Secondly, there is no need for a crank and connecting rod mechanism to realize the reciprocating movement of the machine body 1804. Finally, there is no need for a motor to drive the I-shaped rolling rolls 1805 to rotate periodically. This not only enables the piercing and rolling operations of the billet 4 of the rolled piece in this application to be carried out continuously,There is no need for secondary heating during the transfer process, and the power sources of the periodic tube rolling assembly 18 all come from the power conduction of the motor 103 in the piercing assembly 1, effectively reducing production costs and improving the linkage effect of the device.

[0036] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various implementations with various modifications suitable for specific purposes.

Claims

1. A perforating device for a low carbon steel pipe, comprising a perforating assembly (1) and a rolling mill body (2), characterized in that: The perforating assembly (1) comprises a bearing seat (101), a barrel-shaped roller (102), a motor (103), a sprocket (104), a chain (105) and a ball head rod (106); the barrel-shaped roller (102) is rotatably mounted inside the bearing seats (101) at both ends, and the motor (103) is connected to the outer side of the barrel-shaped roller (102) at the lower end; the sprocket (104) is coaxially connected to the inner side of the barrel-shaped roller (102) at both ends, and the sprockets (104) at the upper and lower ends are rotatably driven through the chain (105); and the barrel-shaped roller (102) at the upper end ) is connected to the inner side of the roller (106), the barrel rollers (102) at the upper and lower ends rotate in the same direction, and the axes of the barrel rollers (102) at the upper and lower ends are inclined relative to the rolling axis. It also includes a periodic tube rolling assembly (18), which includes a sliding seat (1801), a sliding pin (1802), a guide hole (1803), a machine body (1804), an I-shaped roller (1805) and a gear (1806). The top end of the through hole in the middle of the sliding seat (1801) is provided with a sliding pin (1802), and the sliding pin (1802) is located at the reciprocating screw rod. (16) The sliding seat (1801) is symmetrically provided with guide holes (1803) on both sides, and the guide holes (1803) are slidably matched with the corresponding guide rods (15). The bottom of the sliding seat (1801) is fixedly installed with a body (1804), and the upper and lower ends of the body (1804) are rotatably installed with I-shaped rollers (1805), and the depth of the groove in the I-shaped roller (1805) changes from deep to shallow. The I-shaped roller (1805) is located outside the body (1804) and is coaxially connected with a gear (1806), and the gear (1806) is connected to the body (1804). 06) are respectively meshed with the teeth at both ends of the bidirectional tooth plate (14) for transmission, an end plate (13) is fixedly installed on the top of the rear end of the rolling mill body (2), and an "L"-shaped bidirectional tooth plate (14) is fixedly connected to the bottom of the end plate (13), guide rods (15) are fixedly connected to both sides of the end plate (13), and a reciprocating screw rod (16) is rotatably installed in the middle of the end plate (13), the surface of the reciprocating screw rod (16) is provided with two thread grooves with the same pitch and opposite rotation directions, and the two ends are connected by a transition curve, and the end of the reciprocating screw rod (16) is connected to the ball head rod (106) for rotational transmission through a ball head seat (17).

2. A perforating device for low carbon steel pipe according to claim 1, characterized in that: The bearing seat (101) is symmetrically fixed on both sides of the front end of the rolling mill body (2), and a feed support plate (3) is fixedly connected to the front end inlet of the rolling mill body (2), a rolled piece (4) is received inside the recess of the feed support plate (3), and there is an advance angle between the axis of the rolled piece (4) and the axis of the barrel-shaped rollers (102) at the upper and lower ends, and the rolled piece (4) rotates in the opposite direction under the friction force of the barrel-shaped rollers (102) at the upper and lower ends.

3. A perforating device for low carbon steel pipe according to claim 2, characterized in that: A guide cover (5) is fixedly mounted on the top of the front end of the rolling mill body (2), and a slider (6) is slidably mounted on a track on the inner wall of the recess of the guide cover (5).

4. A perforating device for low carbon steel pipe according to claim 3, characterized in that: The slider (6) is fixedly connected to the output end of the oil cylinder (7), and a push plate (8) is fixedly connected to the front end of the bottom of the slider (6), and the push plate (8) pushes the rolled piece (4) to move axially along the rolling direction.

5. A perforating device for low carbon steel pipe according to claim 4, characterized in that: A discharging inclined plate (9) is fixedly connected to the rear end outlet of the rolling mill body (2), and an inclined guide groove (10) is provided on the top plane of the discharging inclined plate (9).

6. A perforating device for low carbon steel pipe according to claim 5, characterized in that: A second oil cylinder (11) is bolted to a mounting plate at the rear end of the discharge inclined plate (9), and a core rod (12) is threadedly connected to the output end of the second oil cylinder (11), and the core rod (12) is squeezed along the axial direction of the rolled piece (4) to form a cavity.

7. The perforating device for low carbon steel pipe according to claim 1, characterized in that: The middle part of the reciprocating screw rod (16) is threadedly connected with a periodic tube rolling assembly (18).

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