Perforating machine for seamless steel pipe

Abstract

The utility model relates to the technical field of seamless steel pipe perforating machines, in particular to a perforating machine for seamless steel pipes, which comprises a perforating machine body, a feeding tray is arranged on one side of the perforating machine body, a plurality of roller mechanisms are arranged on the other side of the perforating machine body, and a support is fixedly arranged on the outer wall of the feeding tray. A first hydraulic cylinder is mounted on the support through a mounting seat, a piston rod of the first hydraulic cylinder penetrates through the feeding tray and extends into the feeding tray, a push rod is slidably connected into the feeding tray, an ejector rod is slidably connected into the push rod, and a high-frequency induction coil is fixedly arranged at an inlet of the puncher body. A drilling assembly is installed on the top face of the perforating machine body. The handling capacity of equipment to fault conditions is enhanced, the production interruption time is shortened, the separation process is simplified, the operation efficiency is improved, rapid treatment of clamping stagnation of the seamless steel pipe in the perforating process is facilitated, and the influence on perforating production of the seamless steel pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of seamless steel pipe perforators, in particular to a perforator used for seamless steel pipes. Background Art

[0002] Seamless steel pipe piercing machine is a special mechanical equipment that can form perforations on seamless steel pipes through mechanical force. These perforations are usually used to connect other parts, realize the transmission of fluids or gases, etc. In the production of seamless steel pipes, the role of the perforation process is to pierce the solid pipe blank into a hollow rough pipe. The perforation process plays an important role in modern steel pipe production.

[0003] After searching, a Chinese patent with announcement number CN219025390U provides a top adjustment device for a seamless steel pipe punching machine. By opening the electric cylinder, the telescopic rod can push the mounting frame to move downward, so that the lower end of the extrusion roller installed inside the mounting frame is in contact with the placed perforating rod. Through this setting, the perforating rod can be limited and squeezed. By adjusting in this way, the perforating rod will not be offset when it rotates. In this way, the perforating rod will not cause the perforating angle to change due to the rotation during perforation, thereby affecting the processing quality of the seamless steel pipe.

[0004] However, it was found during use that when the tube billet is pierced by the piercing rod, due to the influence of temperature and piercing speed during the piercing process, the mandrel rod is easily retained inside the tube billet, making it inconvenient to remove the mandrel rod after retention. The timeliness of the treatment directly affects the working efficiency of the piercing machine, which is not conducive to the continuous use of the piercing machine, and further affects the production efficiency of the seamless steel pipe. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a piercing machine for seamless steel pipes, which solves the technical problem that during the piercing operation of the tube blank by a piercing rod, the core rod is easily retained inside the tube blank due to the influence of temperature and piercing speed, making it inconvenient to remove the core rod after retention. The timeliness of the processing directly affects the working efficiency of the piercing machine, which is not conducive to the continuous use of the piercing machine, and further affects the production efficiency of the seamless steel pipe.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a puncher for seamless steel pipes, comprising a puncher body, a feed tray is provided on one side of the puncher body, a plurality of roller mechanisms are provided on the other side of the puncher body, a bracket is fixedly provided on the outer wall of the feed tray, a first hydraulic cylinder is installed on the bracket through a mounting seat, a piston rod of the first hydraulic cylinder passes through the feed tray and extends to the interior, a push rod is slidably connected to the interior of the feed tray, a push rod is slidably connected to the interior of the push rod, a high-frequency induction coil is fixedly provided at the entrance of the puncher body, a drilling assembly is installed on the top surface of the puncher body, a moving block is provided on the drilling assembly, round steel is conveyed at the inlet end of the puncher body, and a core rod is provided at the outlet end of the puncher body.

[0007] Preferably, the pair of rollers mechanism includes a frame, on which two conveying rollers are symmetrically arranged, the outer peripheral walls at both ends of the conveying rollers located at the upper end are rotatably connected to the frame, and a first forward and reverse motor is installed on the outer wall of the frame through a mounting seat, and the output shaft of the first forward and reverse motor is coaxially connected to the conveying rollers located at the upper end.

[0008] Through the above technical solution, the two first forward and reverse motors rotate synchronously, driving the conveying roller at the lower end to rotate synchronously.

[0009] Preferably, the upper end of the frame is symmetrically structured with two through grooves, both ends of the conveying roller at the lower end are located inside the through grooves, the upper end of the frame is slidably connected with a C-shaped block, both ends of the conveying roller at the lower end are sleeved on the lower end of the C-shaped block, and both ends of the conveying roller at the lower end are rotatably connected to the lower end of the C-shaped block.

[0010] Preferably, a second hydraulic cylinder is mounted on the top surface of the C-shaped block via a mounting seat, a piston rod of the second hydraulic cylinder passes through the C-shaped block and extends to the lower end, and a bottom surface of the piston rod of the second hydraulic cylinder is fixedly connected to the top surface of the frame.

[0011] Through the above technical solution, the C-shaped block and the second hydraulic cylinder move downward synchronously through the contraction of the piston rod of the second hydraulic cylinder, and the C-shaped block pushes the conveying roller at the upper end to slide along the through groove, so that the outer walls of the upper and lower conveying rollers are in friction contact with the outer wall of the core rod, pushing the core rod to move toward the center of the round steel and insert it into it, thereby performing a punching operation on the round steel.

[0012] Preferably, the drilling assembly includes a U-shaped block, the bottom surface of the U-shaped block is fixedly connected to the top surface of the punch body, one end of the moving block is slidably connected to the U-shaped block, the top surface of the U-shaped block is mounted with a second cylinder via a mounting seat, the output shaft of the second cylinder passes through the U-shaped block and extends to the lower end, the bottom surface of the U-shaped block is fixedly connected to the top surface of the moving block, a limiting groove is provided at one end of the top surface of the moving block, a push block is slidably connected to the limiting groove, a first cylinder is mounted on the side wall of the moving block via a mounting seat, and the piston rod of the first cylinder is fixedly connected to the push block.

[0013] Through the above technical solution, the piston rod of the second cylinder pushes the moving block to slide along the U-shaped block to a suitable use height.

[0014] Preferably, a fixed block is fixedly provided in the middle of the bottom surface of the movable block, a drill rod is rotatably connected to the push block, a servo motor is installed on the outer wall of the push block through a mounting seat, the output shaft of the servo motor is coaxially connected to the drill rod, the other end of the drill rod is sleeved on the fixed block, and the drill rod is slidably connected to the fixed block.

[0015] Through the above technical solution, the piston rod of the first cylinder is contracted to pull the push block to slide along the limit groove, driving the drill rod and the servo motor to move synchronously, so that the drill rod drills the unperforated area of ​​the round steel.

[0016] Preferably, a groove is provided on the top surface of the push rod, a slider is slidably connected inside the groove, the slider is fixedly connected to the outer wall of the push rod, a screw rod is provided on the upper side of the push rod, the slider is threadedly connected to the screw rod through a threaded hole, and connecting blocks are rotatably connected to both ends of the screw rod.

[0017] Preferably, the bottom surface of the connecting block is fixedly connected to the outer peripheral wall of the push rod, and a second forward and reverse motor is installed on the side of the push rod close to the first hydraulic cylinder through a mounting seat, and the output shaft of the second forward and reverse motor is coaxially connected to the screw rod.

[0018] Through the above technical solution, the output shaft of the second forward and reverse motor drives the screw rod to rotate along the connecting block, so that the screw rod pushes the slider to slide along the groove. The slider drives the push rod to insert into the drilled hole of the round steel and continue to move toward the core rod, pushing the core rod to separate from the round steel.

[0019] Beneficial effects of the utility model:

[0020] 1. The round steel to be punched is transported to the inside of the feed tray through external equipment, and then the piston rod of the first hydraulic cylinder pushes the push rod to slide along the feed tray. The push rod pushes the round steel into the inside of the punching machine body, and at the same time, the two first forward and reverse motors rotate synchronously, driving the conveying roller at the lower end to rotate synchronously. The piston rod of the second hydraulic cylinder contracts, so that the C-shaped block and the second hydraulic cylinder move downward synchronously. The C-shaped block pushes the conveying roller at the upper end to slide along the through groove, so that the outer walls of the upper and lower conveying rollers are in friction contact with the outer wall of the mandrel, pushing the mandrel to move to the center of the round steel and insert it into it, and the round steel is punched. After the punching is completed, the round steel and the mandrel are simultaneously transported to the outside through the roller mechanism, which improves the punching efficiency and ensures the accuracy and stability of the punching.

[0021] 2. During the drilling process of the round steel and the mandrel, if the mandrel gets stuck, the roller mechanism pushes the stuck round steel to move in the direction of the push rod. After adjusting to the appropriate drilling position, the piston rod of the second cylinder pushes the moving block to slide along the U-shaped block to a suitable height, so that the drill bit of the drill rod is located at the center of the side wall of the round steel. At this time, the servo motor rotates to drive the drill rod to rotate along the fixed block, and the piston rod of the first cylinder contracts to pull the push block to slide along the limit slot, driving the drill rod and the servo motor to move synchronously, so that the drill rod can drill the unperforated area of ​​the round steel. Drilling. After drilling is completed, insert the push rod into the opening of the round steel and push the core rod to separate from the round steel. During the drilling process, the end of the round steel is induction heated by a high-frequency induction coil, which facilitates the rapid opening of the drill rod, enhances the equipment's ability to respond to faults, reduces production interruption time, and precise adjustment ensures the accuracy and stability of drilling, improves drilling efficiency and precision, simplifies the separation process, improves operational efficiency, and facilitates the rapid handling of seamless steel pipe jams during the punching process, reducing the impact on seamless steel pipe punching production.

[0022] 3. After drilling the unperforated area of ​​the round steel by the drill rod, the push rod is pushed to the outer wall of the round steel by the first hydraulic cylinder, and then the output shaft of the second forward and reverse motor drives the screw to rotate along the connecting block, so that the screw pushes the slider to slide along the groove, and the slider drives the push rod to insert into the drilled hole of the round steel and continue to move in the direction of the mandrel, and the push rod pushes the mandrel to move away from the puncher body. At this time, the first forward and reverse motor of the roller mechanism rotates in the opposite direction, pushing the mandrel to move in the opposite direction at the same time. At this time, the round steel is fixed by the puncher body, pushing the mandrel to separate from the round steel, so that the stuck mandrel and round steel can be separated quickly and conveniently. After separation, the round steel can be removed, reheated, and then punched again, which improves the separation efficiency of the stuck mandrel and round steel. The fast and accurate separation process reduces the downtime in production and improves production efficiency. The separated round steel is reheated and punched again, which reduces material waste and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the framework structure of the utility model;

[0025] Figure 3 This is a schematic diagram of the drilling assembly structure of the utility model;

[0026] Figure 4 This is a schematic diagram of the push rod structure of the utility model;

[0027] Figure 5 This is a schematic diagram of the screw rod structure of the utility model.

[0028] In the figure: 1. punching machine body; 2. feed tray; 3. roller mechanism; 301. frame; 302. conveying roller; 303. first forward and reverse motor; 304. through slot; 305. C-shaped block; 306. second hydraulic cylinder; 4. bracket; 5. first hydraulic cylinder; 6. push rod; 7. push rod; 8. high-frequency induction coil; 9. drilling assembly; 901. moving block; 902. U-shaped block; 903. limiting slot; 904. push block; 905. first cylinder; 906. fixed block; 907. drill rod; 908. servo motor; 909. second cylinder; 10. round steel; 11. core rod; 12. groove; 13. slider; 14. screw rod; 15. connecting block; 16. second forward and reverse motor. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] Embodiment 1

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present embodiment provides a puncher for seamless steel pipes, including a puncher body 1, a feed tray 2 is provided on one side of the puncher body 1, a plurality of roller mechanisms 3 are provided on the other side of the puncher body 1, a bracket 4 is fixedly provided on the outer wall of the feed tray 2, a first hydraulic cylinder 5 is installed on the bracket 4 through a mounting seat, a piston rod of the first hydraulic cylinder 5 passes through the feed tray 2 and extends to the inside, a push rod 6 is slidably connected inside the feed tray 2, a push rod 7 is slidably connected inside the push rod 6, a high-frequency induction coil 8 is fixedly provided at the entrance of the puncher body 1, a drilling assembly 9 is installed on the top surface of the puncher body 1, a moving block 901 is provided on the drilling assembly 9, round steel 10 is conveyed at the inlet end of the puncher body 1, and a core rod 11 is provided at the outlet end of the puncher body 1.

[0032] The roller mechanism 3 includes a frame 301, on which two conveying rollers 302 are symmetrically arranged. The outer peripheral walls of the conveying roller 302 at both ends of the upper end are rotatably connected to the frame 301. A first forward and reverse motor 303 is installed on the outer wall of the frame 301 through a mounting seat. The output shaft of the first forward and reverse motor 303 is coaxially connected to the conveying roller 302 at the upper end; the two first forward and reverse motors 303 rotate synchronously, driving the conveying roller 302 at the lower end to rotate synchronously.

[0033] The upper end of the frame 301 is symmetrically structured with two through slots 304, and both ends of the conveying roller 302 at the lower end are located inside the through slots 304. The upper end of the frame 301 is slidably connected with a C-shaped block 305, and both ends of the conveying roller 302 at the lower end are sleeved on the lower end of the C-shaped block 305. Both ends of the conveying roller 302 at the lower end are rotatably connected to the lower end of the C-shaped block 305. A second hydraulic cylinder 306 is installed on the top surface of the C-shaped block 305 through a mounting seat, and the piston rod of the second hydraulic cylinder 306 passes through the C-shaped block 305 extends to the lower end, and the bottom surface of the piston rod of the second hydraulic cylinder 306 is fixedly connected to the top surface of the frame 301; through the contraction of the piston rod of the second hydraulic cylinder 306, the C-shaped block 305 and the second hydraulic cylinder 306 move downward synchronously, and the C-shaped block 305 pushes the conveying roller 302 at the upper end to slide along the through groove 304, so that the outer walls of the upper and lower conveying rollers 302 are in friction contact with the outer wall of the core rod 11, pushing the core rod 11 to move to the center of the round steel 10 and insert it into it, so as to perform a perforation operation on the round steel 10.

[0034] The drilling assembly 9 includes a U-shaped block 902, the bottom surface of the U-shaped block 902 is fixedly connected to the top surface of the punching machine body 1, one end of the moving block 901 is slidably connected to the U-shaped block 902, a second cylinder 909 is installed on the top surface of the U-shaped block 902 through a mounting seat, the output shaft of the second cylinder 909 passes through the U-shaped block 902 and extends to the lower end, the bottom surface of the U-shaped block 902 is fixedly connected to the top surface of the moving block 901, a limiting groove 903 is provided at one end of the top surface of the moving block 901, a push block 904 is slidably connected to the limiting groove 903, a first cylinder 905 is installed on the side wall of the moving block 901 through a mounting seat, and the piston rod of the first cylinder 905 is fixedly connected to the push block 904; the moving block 901 is pushed to slide along the U-shaped block 902 to a suitable height for use by the piston rod of the second cylinder 909.

[0035] A fixed block 906 is fixedly provided in the middle of the bottom surface of the moving block 901, and a drill rod 907 is rotatably connected to the push block 904. A servo motor 908 is installed on the outer wall of the push block 904 through a mounting seat. The output shaft of the servo motor 908 is coaxially connected to the drill rod 907, and the other end of the drill rod 907 is sleeved on the fixed block 906, and the drill rod 907 is slidably connected to the fixed block 906; through the contraction of the piston rod of the first cylinder 905, the push block 904 is pulled to slide along the limit groove 903, driving the drill rod 907 and the servo motor 908 to move synchronously, so that the drill rod 907 drills holes in the unperforated area of ​​the round steel 10.

[0036] When in use, firstly, the round steel 10 to be punched is transported to the inside of the feed tray 2 through an external device, and then the piston rod of the first hydraulic cylinder 5 pushes the push rod 6 to slide along the feed tray 2, and the push rod 6 pushes the round steel 10 into the inside of the punching machine body 1, and at the same time, the two first forward and reverse motors 303 rotate synchronously, driving the conveying roller 302 at the lower end to rotate synchronously, and the piston rod of the second hydraulic cylinder 306 contracts, so that the C-shaped block 305 and the second hydraulic cylinder 306 move downward synchronously, and the C-shaped block 305 pushes the conveying roller 302 at the upper end to slide along the through groove 304, so that the outer walls of the upper and lower conveying rollers 302 and the outer wall of the mandrel 11 are in friction contact, pushing the mandrel 11 to move to the center of the round steel 10 and insert it therein, and the round steel 10 is punched. After the punching is completed, the round steel 10 and the mandrel 11 are simultaneously transported to the outside through the roller mechanism 3, thereby improving the punching efficiency and ensuring the accuracy and stability of the punching.

[0037] During the perforation process of the round steel 10 and the core rod 11, when the core rod 11 gets stuck, the stuck round steel 10 is pushed to move in the direction of the push rod 6 by the roller mechanism 3. After adjusting to a suitable drilling position, the piston rod of the second cylinder 909 pushes the moving block 901 to slide along the U-shaped block 902 to a suitable use height, so that the drill bit of the drill rod 907 is located at the center of the side wall of the round steel 10. At this time, the servo motor 908 rotates to drive the drill rod 907 to rotate along the fixed block 906. The piston rod of the first cylinder 905 contracts, pulling the push block 904 to slide along the limit groove 903, driving the drill rod 907 and the servo motor 908 to move synchronously. The drill rod 907 is used to drill holes in the unperforated areas of the round steel 10. After the drilling is completed, the mandrel 11 is pushed to separate the round steel 10 by inserting the push rod 7 into the opening of the round steel 10. During the drilling process, the end of the round steel 10 is induction heated by the high-frequency induction coil 8, which facilitates the rapid opening of the drill rod 907, enhances the equipment's ability to respond to fault conditions, reduces the time of production interruption, and ensures the accuracy and stability of drilling through precise adjustment, improves the efficiency and precision of drilling, simplifies the separation process, improves operating efficiency, facilitates the rapid processing of seamless steel pipe jams during the punching process, and reduces the impact on the punching production of seamless steel pipes.

[0038] Embodiment 2

[0039] like Figure 1 , Figure 4 and Figure 5 As shown, on the basis of Example 1, a groove 12 is provided on the top surface of the push rod 6, and a slider 13 is slidably connected inside the groove 12. The slider 13 is fixedly connected to the outer wall of the push rod 7. A screw 14 is provided on the upper side of the push rod 6. The slider 13 is threadedly connected to the screw 14 through a threaded hole. Both ends of the screw 14 are rotatably connected to connecting blocks 15, and the bottom surface of the connecting block 15 is fixedly connected to the outer peripheral wall of the push rod 6. A second forward and reverse motor 16 is installed on the side of the push rod 6 close to the first hydraulic cylinder 5 through a mounting seat, and the output shaft of the second forward and reverse motor 16 is coaxially connected to the screw 14; the screw 14 is driven to rotate along the connecting block 15 by the output shaft of the second forward and reverse motor 16, so that the screw 14 pushes the slider 13 to slide along the groove 12, and the slider 13 drives the push rod 7 to insert into the drilled hole of the round steel 10 and continuously move toward the direction of the core rod 11, pushing the core rod 11 to separate from the round steel 10.

[0040] When in use, after drilling the unperforated area of ​​the round steel 10 through the drill rod 907, the push rod 6 is pushed to move to the outer wall of the round steel 10 through the first hydraulic cylinder 5, and then the screw rod 14 is driven to rotate along the connecting block 15 through the output shaft of the second forward and reverse motor 16, so that the screw rod 14 pushes the slider 13 to slide along the groove 12, and the slider 13 drives the push rod 7 to insert into the drilling hole of the round steel 10 and continue to move toward the mandrel 11, and the push rod 7 pushes the mandrel 11 to move away from the punching machine body 1. At this time, the first forward and reverse motor 303 of the roller mechanism 3 is used. Reverse rotation pushes the mandrel 11 to move in the reverse direction at the same time. At this time, the round steel 10 is fixed by the puncher body 1, and the mandrel 11 is pushed to separate from the round steel 10, so that the stuck mandrel 11 and the round steel 10 can be separated quickly and conveniently. After separation, the round steel 10 is removed and reheated and then punched again, which improves the separation efficiency of the stuck mandrel 11 and the round steel 10. The fast and accurate separation process reduces the downtime in production and improves production efficiency. The separated round steel 10 is reheated and punched again, which reduces material waste and reduces production costs.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A piercing machine for seamless steel pipes, comprising a piercing machine body (1), characterized in that: A feed tray (2) is provided on one side of the punching machine body (1), and a plurality of roller mechanisms (3) are provided on the other side of the punching machine body (1). A bracket (4) is fixedly provided on the outer wall of the feed tray (2), and a first hydraulic cylinder (5) is installed on the bracket (4) through a mounting seat. The piston rod of the first hydraulic cylinder (5) penetrates the feed tray (2) and extends to the inside. A push rod (6) is slidably connected to the inside of the feed tray (2), and a push rod (7) is slidably connected to the inside of the push rod (6). A high-frequency induction coil (8) is fixedly provided at the entrance of the punching machine body (1), and a drilling assembly (9) is installed on the top surface of the punching machine body (1). A moving block (901) is provided on the drilling assembly (9). Round steel (10) is transported at the inlet end of the punching machine body (1), and a core rod (11) is provided at the outlet end of the punching machine body (1).

2. The piercing machine for seamless steel pipe according to claim 1, characterized in that: The roller mechanism (3) comprises a frame (301), and two conveying rollers (302) are symmetrically arranged on the frame (301), and the outer peripheral walls at both ends of the conveying roller (302) located at the upper end are rotatably connected to the frame (301), and a first forward and reverse motor (303) is installed on the outer wall of the frame (301) through a mounting seat, and the output shaft of the first forward and reverse motor (303) is coaxially connected to the conveying roller (302) located at the upper end.

3. The piercing machine for seamless steel pipe according to claim 2, characterized in that: The upper end of the frame (301) is symmetrically structured and has two through grooves (304); both ends of the conveying roller (302) located at the lower end are located inside the through grooves (304); the upper end of the frame (301) is slidably connected to a C-shaped block (305); both ends of the conveying roller (302) located at the lower end are sleeved on the lower end of the C-shaped block (305); and both ends of the conveying roller (302) located at the lower end are rotatably connected to the lower end of the C-shaped block (305).

4. The piercing machine for seamless steel pipe according to claim 3, characterized in that: A second hydraulic cylinder (306) is mounted on the top surface of the C-shaped block (305) via a mounting seat, a piston rod of the second hydraulic cylinder (306) passes through the C-shaped block (305) and extends to the lower end, and a bottom surface of the piston rod of the second hydraulic cylinder (306) is fixedly connected to the top surface of the frame (301).

5. The piercing machine for seamless steel pipe according to claim 1, characterized in that: The drilling assembly (9) comprises a U-shaped block (902), the bottom surface of the U-shaped block (902) is fixedly connected to the top surface of the punching machine body (1), one end of the moving block (901) is slidably connected to the U-shaped block (902), the top surface of the U-shaped block (902) is mounted with a second cylinder (909) via a mounting seat, the output shaft of the second cylinder (909) passes through the U-shaped block (902) and extends to the lower end, the bottom surface of the U-shaped block (902) is fixedly connected to the top surface of the moving block (901), a limiting groove (903) is provided at one end of the top surface of the moving block (901), a push block (904) is slidably connected to the limiting groove (903), a first cylinder (905) is mounted on the side wall of the moving block (901) via a mounting seat, and the piston rod of the first cylinder (905) is fixedly connected to the push block (904).

6. The piercing machine for seamless steel pipe according to claim 5, characterized in that: A fixed block (906) is fixedly arranged in the middle of the bottom surface of the moving block (901); a drill rod (907) is rotatably connected to the pushing block (904); a servo motor (908) is installed on the outer wall of the pushing block (904) via a mounting seat; an output shaft of the servo motor (908) is coaxially connected to the drill rod (907); the other end of the drill rod (907) is sleeved on the fixed block (906); and the drill rod (907) is slidably connected to the fixed block (906).

7. The piercing machine for seamless steel pipe according to claim 1, characterized in that: The top surface of the push rod (6) is provided with a groove (12), the inside of the groove (12) is slidably connected with a slider (13), the slider (13) is fixedly connected to the outer wall of the push rod (7), a screw rod (14) is provided on the upper side of the push rod (6), the slider (13) is threadedly connected to the screw rod (14) through a threaded hole, and both ends of the screw rod (14) are rotatably connected with connecting blocks (15).

8. The piercing machine for seamless steel pipe according to claim 7, characterized in that: The bottom surface of the connecting block (15) is fixedly connected to the outer peripheral wall of the push rod (6); a second forward and reverse motor (16) is installed on the side of the push rod (6) close to the first hydraulic cylinder (5) through a mounting seat; and the output shaft of the second forward and reverse motor (16) is coaxially connected to the screw rod (14).

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