Perforating equipment for low-carbon steel pipe

Abstract

The invention discloses perforating equipment for a low-carbon steel pipe, and relates to the technical field of low-carbon steel pipe production, the perforating equipment comprises a perforating assembly, and is characterized in that the perforating assembly comprises bearing seats, barrel-shaped rollers, a motor, a chain wheel, a chain and a ball head rod, and the barrel-shaped rollers are rotationally mounted in the bearing seats at the upper end and the lower end; a motor is connected to the outer side of the barrel-shaped roller located at the lower end, and chain wheels are coaxially connected to the inner sides of the barrel-shaped rollers at the upper end and the lower end. In the using process, axial movement and reverse rotation are combined to form spiral movement of a rolled piece blank, and then the rolled piece blank is extruded in the axial direction under the pushing of the second oil cylinder to the core rod to form a hollow billet cavity. The rolling piece blank entering the punching station does spiral motion combining axial movement and reverse rotation, punching operation of the rolling piece blank is achieved in cooperation with extrusion of the core rod, 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: 1. During the use of the present invention, the present application designs the perforating assembly and the periodic tube rolling assembly in linkage. On the one hand, while the motor provides synchronous rotation power for the barrel-shaped rollers at the upper and lower ends, the barrel-shaped roller at the upper end further provides power transmission to the reciprocating screw through the ball head rod, so that the sliding seat drives the machine body to make axial reciprocating motion. In addition, the gear and the tooth profile at both ends of the two-way tooth plate are engaged to drive the I-shaped rollers at both ends of the machine body to rotate periodically, and then the rough tube is rolled through the periodic rotation and reciprocating motion of the I-shaped rollers, wherein the use of the core head is still along the The mandrel in the perforation assembly is used to reduce the assembly cost. It can be seen that in the design scheme of the periodic tube rolling assembly of the present application, firstly, a feeder is not required to realize the axial feeding of the raw tube, and 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 I-shaped roller to rotate periodically, which not only enables the perforation and rolling operations of the rolled blank of the present application to be carried out continuously without secondary heating during the transportation process, but also the power source of the periodic tube rolling assembly comes from the power transmission of the motor in the perforation assembly, which effectively reduces the production cost and improves the linkage effect of the device; 2. During the use of the present invention, the present application combines axial movement with reverse rotation to form a spiral movement of the rolled stock, and then under the push of two pairs of mandrels of the oil cylinder, the rolled stock is squeezed axially to form a rough tube cavity. With the help of a reasonable oblique rolling and piercing kinematic design, the rolled stock entering the piercing station performs a spiral movement combining axial movement and reverse rotation, and the piercing operation of the rolled stock is realized by cooperating with the extrusion of the mandrel. The structure is simple and the production efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the device of the present invention; Figure 2 This is a schematic diagram of the structure of the discharging inclined plate of the present invention; Figure 3 This is a schematic diagram of the structure of the feed support plate of the present invention; Figure 4 It is a schematic diagram of the overall structure of the perforating assembly of the present invention; Figure 5 This is a schematic diagram of the explosion structure of the perforating assembly of the present invention; Figure 6 This is a schematic diagram of the end plate structure of the present invention; Figure 7 It is a schematic diagram of the structure of the periodic tube rolling assembly of the present invention.

[0018] In the figure: 1. perforation assembly; 101. bearing seat; 102. barrel roller; 103. motor; 104. sprocket; 105. chain; 106. ball head rod; 2. rolling mill body; 3. feed support plate; 4. rolled product; 5. guide cover; 6. slide block; 7. oil cylinder one; 8. push plate; 9. discharge inclined plate; 10. inclined guide groove; 11. oil cylinder two; 12. mandrel; 13. end plate; 14. two-way tooth plate; 15. guide rod; 16. reciprocating screw rod; 17. ball head seat; 18. periodic tube rolling assembly; 1801. sliding seat; 1802. sliding pin; 1803. guide hole; 1804. machine body; 1805. I-shaped roller; 1806. gear. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention. See also Figures 1 to 5 The present invention provides a technical solution: a perforating device for low carbon steel pipes, comprising a perforating assembly 1, the perforating assembly 1 comprising a bearing seat 101, a barrel roller 102, a motor 103, a sprocket 104, a chain 105 and a ball head rod 106, the barrel rollers 102 are rotatably installed inside the upper and lower bearing seats 101, and the motor 103 is connected to the outer side of the barrel roller 102 at the lower end, the sprockets 104 are coaxially connected to the inner sides of the upper and lower barrel rollers 102, and the sprockets 104 at the upper and lower ends are rotated and driven by the chain 105, and the sprockets 104 at the upper and lower ends are rotated and driven by the chain 105, and the sprockets 104 at the upper and lower ends are rotated and driven by the chain 105. The inner side of the barrel roller 102 at the upper end is connected to a ball head rod 106 for transmission. 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. The bearing seat 101 is symmetrically fixed to the two sides of the front end of the rolling mill body 2, and the front inlet of the rolling mill body 2 is fixedly connected to a feed support plate 3, and the inside of the recess of the feed support plate 3 receives the rolled piece 4, and there is an advance angle between the axis of the rolled piece 4 and the axis of the barrel rollers 102 at the upper and lower ends, and the rolled piece 4 rotates in the opposite direction driven by the friction of the barrel rollers 102 at the upper and lower ends; The specific operation is as follows. In the present application, the barrel roller 102 at the lower end is directly driven by the motor 103, and the barrel rollers 102 at the upper and lower ends further rotate in the same direction through the transmission of the sprocket 104 and the chain 105. Since the axes of the barrel rollers 102 at the upper and lower ends are inclined relative to the rolling axis, the rolled piece 4 is driven by the friction force to rotate in the opposite direction after entering between the barrel rollers 102 at the upper and lower ends, and since the axes of the barrel rollers 102 at the upper and lower ends have an advancing angle to the rolled piece 4, the rolled piece 4 moves axially. The above-mentioned axial movement combined with the reverse rotation constitutes a spiral movement of the rolled piece 4. The present application uses a reasonable oblique rolling and perforation kinematic design to make the rolled piece 4 entering the perforation station perform a spiral movement combining axial movement and reverse rotation, and cooperates with the extrusion of the mandrel 12 to realize the perforation operation of the rolled piece 4. The structure is simple and the production efficiency is effectively improved. See also Figures 2 to 3 A guide cover 5 is fixedly installed on the top of the front end of the rolling mill body 2, and a slider 6 is slidably installed on the track of the inner wall of the recess of the guide cover 5, the slider 6 is fixedly connected to the output end of the oil cylinder 1 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, a discharge inclined plate 9 is fixedly connected to the outlet of 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, and an oil cylinder 2 11 is bolted to the mounting plate at the rear end of the discharge inclined plate 9, and a mandrel 12 is threadedly connected to the output end of the oil cylinder 2 11, and the mandrel 12 is squeezed along the axial direction of the rolled piece 4 to form a cavity; The specific operation is as follows: the heated rolled piece 4 blank is automatically fed to the feed support plate 3, the oil cylinder 1 7 pulls the slide block 6 to slide on the track located on the inner wall of the notch of the guide cover 5, and then the rolled piece 4 blank is pushed axially along the rolling direction to the perforation station through the push plate 8, and then the rolled piece 4 blank is squeezed axially along the rolling direction under the push of the mandrel 12 by the oil cylinder 2 11 to form a rough tube cavity; See also Figure 6 to Figure 7An end plate 13 is fixedly installed on the top of the rear end of the rolling mill body 2, and a bidirectional tooth plate 14 with an "L"-shaped structure 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 rotation transmission through a ball head seat 17. A periodic tube rolling assembly 18 is threadedly connected to the middle of the reciprocating screw rod 16, and the periodic tube rolling assembly 18 includes a sliding seat 1801, a sliding pin 1802, a guide hole 1803, a body 1804, an I-shaped roller 1805 and a gear 1 806, a sliding pin 1802 is provided at the top of the through hole in the middle of the sliding seat 1801, and the sliding pin 1802 is located in the thread groove on the surface of the reciprocating screw rod 16 for axial reciprocating motion, and 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, and 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, and the I-shaped roller 1805 is located outside the body 1804 and is coaxially connected with a gear 1806, and the gear 1806 is respectively meshed with the teeth at both ends of the two-way tooth plate 14 for transmission; The specific operation is as follows: the barrel-shaped roller 102 at the upper end is rotated by the chain 105, and is also rotated to the reciprocating screw 16 in the middle of the end plate 13 through the ball head rod 106 connected to the inner side. During the rotation of the reciprocating screw 16, the side of the thread groove pushes the sliding pin 1802 placed therein, thereby driving the sliding seat 1801 to slide back and forth between the guide rods 15 on both sides. During the process of the sliding seat 1801 driving the machine body 1804 to reciprocate, the I-shaped rollers 102 at both ends of the machine body 1804 are rotated. 805 is periodically rotated through the meshing of the gear 1806 and the teeth at both ends of the bidirectional tooth plate 14, and then the rolling of the rough pipe is achieved through the periodic rotation and reciprocating motion of the I-shaped roller 1805. The present application realizes the rolling of the rough pipe by linking the perforating component 1 with the periodic tube rolling component 18. On the one hand, the motor 103 provides synchronous rotation power to the barrel rollers 102 at the upper and lower ends, and the barrel roller 102 at the upper end further provides power transmission to the reciprocating screw rod 16 through the ball head rod 106. The sliding seat 1801 drives the machine body 1804 to make axial reciprocating motion. In addition, the meshing of the gear 1806 and the teeth at both ends of the bidirectional tooth plate 14 drives the I-shaped rollers 1805 at both ends of the machine body 1804 to rotate periodically, and then the rolling of the rough tube is realized through the periodic rotation and reciprocating motion of the I-shaped rollers 1805, wherein the use of the core head still uses the core rod 12 in the perforating component 1 to reduce the assembly cost. It can be seen that in the design scheme of the periodic tube rolling component 18 of the present application, firstly, a feeder is not required to realize the axial feeding of the rough tube, and secondly, a crank-connecting rod mechanism is not required to realize the reciprocating motion of the machine body 1804, and finally, a motor is not required to drive the I-shaped rollers 1805 to rotate periodically, which not only enables the perforation and rolling operations of the rolled piece 4 of the present application to be carried out continuously without secondary heating during the transportation process, but also the power source of the periodic tube rolling component 18 comes from the power transmission of the motor 103 in the perforating component 1, which effectively reduces the production cost and improves the linkage effect of the device.

[0020] 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.

[0021] In summary, when the perforating equipment for low carbon steel pipe is used, the heated rolled piece 4 is automatically loaded onto the feed pallet 3, and the oil cylinder 7 pulls the slide block 6 to slide on the track located on the inner wall of the recess of the guide cover 5, and then the rolled piece 4 is pushed axially along the rolling direction to the perforating station through the push plate 8. In this application, the barrel roller 102 located at the lower end is directly driven by the motor 103, and further the upper and lower barrel rollers 102 rotate in the same direction through the transmission of the sprocket 104 and the chain 105. Since the axes of the upper and lower barrel rollers 102 are inclined relative to the rolling axis, the rolled piece 4 is driven by friction to rotate in the opposite direction after entering between the upper and lower barrel rollers 102, and since the axes of the upper and lower barrel rollers 102 have an advancing angle to the rolled piece 4, The rolled piece 4 billet moves axially again, and the above-mentioned axial movement combined with the reverse rotation constitutes a spiral movement of the rolled piece 4 billet, and then the rolled piece 4 billet is squeezed axially under the push of the oil cylinder 11 on the mandrel 12 to form a hairy tube cavity. The present application uses a reasonable oblique rolling and perforation kinematic design to make the rolled piece 4 billet entering the perforation station perform a spiral movement combining axial movement and reverse rotation, and cooperates with the extrusion of the mandrel 12 to realize the perforation operation of the rolled piece 4 billet. The structure is simple and the production efficiency is effectively improved. The barrel-shaped roller 102 at the upper end is rotated by the chain 105 while being rotated by the ball head rod 106 connected to the inside to the reciprocating screw rod 16 in the middle of the end plate 13. During the rotation of the reciprocating screw rod 16, the side of its thread groove pushes the reciprocating screw rod placed therein The sliding pin 1802 then drives the sliding seat 1801 to slide back and forth between the guide rods 15 on both sides. In the process of the sliding seat 1801 driving the machine body 1804 to reciprocate, the I-shaped rollers 1805 at both ends of the machine body 1804 respectively rotate periodically through the meshing of the gears 1806 and the teeth at both ends of the two-way tooth plate 14, and then the rough pipe is rolled through the periodic rotation and reciprocating motion of the I-shaped rollers 1805. The present application realizes the rolling of the rough pipe by linking the perforating component 1 with the periodic pipe rolling component 18. On the one hand, while the motor 103 provides synchronous rotation power to the barrel-shaped rollers 102 at the upper and lower ends, the barrel-shaped rollers 102 at the upper end further provide power transmission to the reciprocating screw 16 through the ball head rod 106, so that the sliding seat 1801 drives the machine The body 1804 makes axial reciprocating motion. In addition, the meshing of the gear 1806 and the teeth at both ends of the bidirectional tooth plate 14 drives the I-shaped rollers 1805 at both ends of the body 1804 to rotate periodically, and then the rolling of the rough tube is realized through the periodic rotation and reciprocating motion of the I-shaped rollers 1805, wherein the core head still uses the core rod 12 in the perforating component 1 to reduce the assembly cost. It can be seen that in the design scheme of the periodic tube rolling component 18 of the present application, firstly, a feeder is not required to realize the axial feeding of the rough tube, and secondly, a crank connecting rod mechanism is not required to realize the reciprocating motion of the body 1804, and finally, a motor is not required to drive the I-shaped rollers 1805 to rotate periodically, which not only makes the perforation and rolling operations of the rolled piece 4 of the present application can be carried out continuously,There is no need for secondary heating during the transportation process, and the power source of the periodic tube rolling assembly 18 comes from the power transmission of the motor 103 in the perforating assembly 1, which effectively reduces the production cost and improves the linkage effect of the device.

[0022] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A perforating device for a low carbon steel pipe, comprising a perforating assembly (1), 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 rollers (102) are rotatably mounted inside the bearing seats (101) at the upper and lower ends, and the outer side of the barrel-shaped roller (102) at the lower end is connected to the motor (103); the inner sides of the barrel-shaped rollers (102) at the upper and lower ends are coaxially connected to the sprockets (104); the sprockets (104) at the upper and lower ends are rotatably driven by the chain (105); the inner side of the barrel-shaped roller (102) at the upper end is connected to the ball head rod (106); the barrel-shaped rollers (102) at the upper and lower ends rotate in the same direction, and the axes of the barrel-shaped rollers (102) at the upper and lower ends are inclined relative to the rolling axis; the cyclic tube rolling assembly (18) comprises 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), a sliding pin (1802) is provided at the top of the through hole in the middle of the sliding seat (1801), and the sliding pin (1802) is located in the thread groove on the surface of the reciprocating screw rod (16) for axial reciprocating motion, and guide holes (1803) are symmetrically opened on both sides of the sliding seat (1801), and the guide holes (1803) are slidably connected to the corresponding guide rods (15). The sliding seat (1801) is dynamically matched, and a body (1804) is fixedly installed at the bottom of the sliding seat (1801), and I-shaped rollers (1805) are rotatably installed at the upper and lower ends of the body (1804), 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 to a gear (1806), and the gear (1806) is respectively meshed with the teeth at both ends of the bidirectional tooth plate (14) for transmission.

2. A perforating device for low carbon steel pipe according to claim 1, characterized in that: The bearing seats (101) are symmetrically fixed to 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. A perforating device for low carbon steel pipe according to claim 6, characterized in that: An end plate (13) is fixedly mounted on the top of the rear end of the rolling mill body (2), and a bidirectional tooth plate (14) with an "L"-shaped structure is fixedly connected to the bottom of the end plate (13).

8. A perforating device for low carbon steel pipe according to claim 7, characterized in that: Guide rods (15) are fixedly connected to both sides of the end plate (13), and a reciprocating screw rod (16) is rotatably mounted 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. The end of the reciprocating screw rod (16) is connected to the ball head rod (106) for rotational transmission via a ball head seat (17).

9. A perforating device for a low carbon steel pipe according to claim 8, characterized in that: A periodic tube rolling assembly (18) is threadedly connected to the middle portion of the reciprocating screw rod (16).

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