Internal thread seamless steel pipe cold-drawing internal mold mechanism

Abstract

The utility model provides a cold-drawing internal mold mechanism for an internal thread seamless steel pipe, and belongs to the technical field of machinery. The problems that in the prior art, internal threads are difficult to machine, and quality is not high are solved. The cold-drawing inner die mechanism for the internal thread seamless steel pipe comprises a rack and a cold-drawing outer die which is fixedly connected to the upper portion of the right end of the rack, and is characterized by further comprising a spiral inner die, a rotating assembly, a propelling assembly and an oil conveying assembly, the propelling assembly is transversely arranged, and the left end of the propelling assembly is fixedly connected to the upper portion of the left end of the rack; the right end of the propelling assembly is fixedly connected with the rotating assembly, and the outer side of the spiral inner mold is provided with spiral threads. The device has the advantages of convenience in feeding and conveying, labor saving, high working efficiency, convenience in inputting lubricating oil into the steel pipe, promotion of internal thread machining and high production quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to an internal thread seamless steel pipe cold drawing inner die mechanism. Background Art

[0002] With the development of society, the usage of seamless steel pipes in daily life is increasing, and they are widely used in all walks of life. Among them, internally threaded seamless steel pipes are the most widely used. Compared with ordinary seamless steel pipes, they have higher strength and can effectively overcome the laminar flow phenomenon caused by slow flow of the medium in the steel pipe.

[0003] However, the processing difficulty of internally threaded seamless steel pipes is generally large, and the internal threads often fail to meet the processing requirements. The main problems in the existing technology for cold drawing of internally threaded seamless steel pipes are: the positioning of the spiral inner die is difficult, and each cold drawing requires manual sleeveing ​​of the steel pipe on the outside of the spiral inner die, and then the two are manually placed together in the cold drawing outer film and the position of the spiral inner die is adjusted to determine the position of the spiral inner die before the subsequent cold drawing process can be carried out; it is difficult to add lubricating oil to the steel pipe during the processing, which makes it difficult to rotate the spiral inner die, resulting in inconsistent pitch of the internal threads and more burrs on the threads, especially during high-speed pipe drawing. Summary of the invention

[0004] The utility model aims to solve the above problems in the prior art and to provide an internal thread seamless steel pipe cold drawing inner die mechanism which is convenient for feeding and has high working efficiency.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A cold-drawn inner die mechanism for an internally threaded seamless steel pipe comprises a frame and a cold-drawn outer die, the cold-drawn outer die being fixedly connected to the upper right end of the frame, and is characterized in that it also comprises a spiral inner die, a rotating assembly, a propulsion assembly and an oil delivery assembly, the propulsion assembly being arranged horizontally and the left end of the propulsion assembly being fixedly connected to the upper left end of the frame, the right end of the propulsion assembly being fixedly connected to the rotating assembly, the outer side of the spiral inner die having a spiral pattern, the spiral inner die being fixedly connected to the right end of the rotating assembly and the spiral inner die being opposite to the cold-drawn outer die on the left and right, the oil delivery assembly being arranged between the spiral inner die and the rotating assembly, the oil delivery assembly being able to deliver lubricating oil to the spiral inner die, and the above-mentioned rotating assembly being able to drive the spiral inner die to rotate through the oil delivery assembly, in an initial state, the spiral inner die is away from the cold-drawn outer die, and when the propulsion assembly is running, the propulsion assembly can push the rotating assembly to move to the right, and the rotating assembly drives the spiral inner die to move to the right until the spiral inner die is embedded in the cold-drawn outer die.

[0007] The cold-drawn inner die mechanism for an internally threaded seamless steel pipe is used for the internal thread and cold-drawing processing of seamless steel pipes. The shape of the internal thread is determined by setting a spiral inner die, and a rotating assembly is set to drive the spiral inner die to rotate, so that the inner wall of the steel pipe after cold drawing can form an internal thread with smooth thread connection. The feeding is facilitated by setting a pushing assembly, and the pushing assembly can push the steel pipe to be processed and the spiral inner die to the cold-drawing outer die together, saving manpower and facilitating subsequent cold drawing. The oil delivery assembly is set to facilitate the continuous delivery of lubricating oil into the steel pipe during the cold drawing process, so that the spiral inner die rotates more smoothly, and the cold drawing process of the internal thread is promoted, so that the pitch of the internal thread of the seamless steel pipe after cold drawing is more uniform, the possibility of burrs on the thread is reduced, and the quality of the internally threaded seamless steel pipe is improved.

[0008] In the above-mentioned internal thread seamless steel pipe cold drawing inner die mechanism, the rotating assembly includes a motor, a driving wheel, a driven wheel, a transmission belt and a housing, the housing is covered on the outside of the driving wheel, the driven wheel and the transmission belt, the driving wheel and the driven wheel are axially fixed in the housing and the driving wheel and the driven wheel can rotate circumferentially, the driven wheel and the driving wheel are arranged vertically opposite to each other, the transmission belt is sleeved on the driving wheel and the driven wheel, the motor is fixedly connected to the outside of the right side of the housing, the output shaft of the motor extends into the housing and is connected to the driving wheel, and the driven wheel is fixedly connected to the oil delivery assembly.

[0009] The motor drives the driving wheel to rotate, and the transmission belt is sleeved on the driving wheel and the driven wheel and the transmission belt is in a tensioned state, so that the driving wheel can drive the driven wheel to rotate through the transmission belt. The setting of the shell provides a connection platform for the motor, the driving wheel and the driven wheel, and the shell covers the outside of the driving wheel, the driven wheel and the transmission belt and also plays a protective role, protecting the normal operation of the rotating assembly, the driven wheel is fixedly connected to the oil delivery assembly, and the oil delivery assembly is connected to the spiral inner mold, so that the rotation of the driven wheel can drive the spiral inner mold to rotate.

[0010] In the above-mentioned cold-drawn inner die mechanism for internally threaded seamless steel pipe, the oil delivery component includes a conduit, a rotary joint and a hose. The rotary joint is arranged on the left side of the shell. The input end of the rotary joint is connected to a hose. The other end of the hose can be connected to an external oil delivery pump. The output end of the rotary joint is connected to a conduit. The conduit is sequentially arranged from left to right on the left side of the shell, the driven wheel, and the right side of the shell and extends from the right side of the shell. The conduit is fixedly connected to the driven wheel and can rotate relative to the shell under the drive of the driven wheel. The right end of the conduit is fixedly connected to the spiral inner die and the conduit body has a penetrating oil outlet hole near the spiral inner die.

[0011] The left end of the conduit is connected to the output end of the rotary joint, and the input end of the rotary joint is connected to a hose. The hose can be connected to an external oil pump. An oil outlet is provided at the right end of the conduit, so that the external oil pump pumps lubricating oil into the hose. The lubricating oil is transported to the conduit through the hose and the rotary joint, and then transported to the right through the conduit and flows out from the oil outlet. The lubricating oil flowing out of the oil outlet can fully lubricate the inner wall of the steel pipe and the outer wall of the spiral inner mold during the cold drawing of the steel pipe, promote the formation of the internal thread of the steel pipe and the cold drawing, and make the internal thread of the steel pipe smooth and the pitch more The tube is a rigid tube body, which is passed through the driven wheel and fixedly connected to the driven wheel. The right end of the tube is fixedly connected to the spiral inner die. The tube acts as a rotating shaft between the driven wheel and the spiral inner die. The rotation of the driven wheel drives the tube to rotate, and the tube drives the spiral inner die to rotate, so that the spiral inner die can form an internal thread in the steel pipe during the cold drawing process of the steel pipe. Since the tube and the hose are connected by a rotary joint, the hose can continue to transport oil into the tube during the rotation of the tube.

[0012] In the above-mentioned internal thread seamless steel pipe cold drawing inner die mechanism, the propulsion assembly includes a cylinder and a support plate. The support plate is vertically fixed to the upper left end of the frame, the cylinder is fixed to the right side of the support plate and the cylinder is parallel to the upper surface of the frame, and the piston rod end of the cylinder is fixed to the middle left side of the shell.

[0013] The cylinder is fixedly connected to the support plate, and the support plate is fixedly connected to the frame, so that the cylinder can be stably connected to the frame through the support plate. The setting of the cylinder is convenient for feeding. The end of the piston rod of the cylinder is fixedly connected to the middle of the left side of the shell, so that the expansion and contraction of the cylinder can drive the entire rotating assembly to move back and forth, and the rotating assembly can drive the entire oil delivery assembly to move back and forth, and can also drive the spiral inner mold fixed to the right end of the conduit to move back and forth. In the initial state, the piston rod of the cylinder contracts, and the spiral inner mold moves away from the cold-drawn outer mold. The steel pipe to be processed is put on the spiral inner mold and the conduit from the spiral inner mold, and then the piston rod of the cylinder extends to push the rotating assembly and the oil delivery assembly, thereby pushing the spiral inner mold and the steel pipe together in the direction of the cold-drawn outer mold until the steel pipe and the spiral inner mold are positioned in the cold-drawn outer mold.

[0014] In the above-mentioned internal thread seamless steel pipe cold drawing inner die mechanism, the motor is fixedly connected to the shell through a connecting seat, the connecting seat is located at the lower part of the shell and the motor, the shell is fixedly connected to the connecting seat, and the motor is fixedly connected to the connecting seat.

[0015] The setting of the connecting seat makes the connection between the motor and the housing more stable.

[0016] In the above-mentioned internal thread seamless steel pipe cold drawing inner die mechanism, it also includes a guide rod, which is arranged parallel to the upper surface of the frame, and the side of the above-mentioned connecting seat has a penetrating guide hole, the guide rod matches the guide hole, the guide rod is inserted into the guide hole and the two are slidably connected, the left end of the guide rod is fixedly connected to the support plate, and the right end of the guide rod is fixedly connected to the side of the cold drawing outer die.

[0017] The guide rod plays a guiding role, and the guide hole passing through the side of the connecting seat plays a limiting role. The guide rod is inserted into the guide hole, so that the connecting seat can slide along the length direction of the guide rod. Therefore, when the piston rod of the cylinder is extended and retracted to drive the shell to move, due to the joint action of the guide rod and the guide hole, the movement of the shell is smoother, and the movement of the rotating assembly, the oil delivery assembly and the spiral inner mold is further smoother, so that the steel pipe to be processed and the spiral inner mold can be more accurately sent into the cold drawing outer mold, and it is not easy to deviate.

[0018] In the above-mentioned internal thread seamless steel pipe cold drawing inner die mechanism, there are a plurality of oil outlet holes, and the plurality of oil outlet holes are arranged in a circular array along the pipe body of the pipe.

[0019] The setting of several oil outlet holes facilitates the lubrication of the inner wall of the steel pipe. The lubricating oil transported to the conduit can flow out from the several oil outlet holes and then fully lubricate the inner wall of the steel pipe and the spiral inner die during the cold drawing process, making the processed thread smoother, reducing the appearance of burrs, and improving the quality of the internal thread seamless steel pipe.

[0020] In the above-mentioned cold-drawn inner die mechanism for internally threaded seamless steel pipe, the cold-drawn outer die includes a die base having a penetrating cold-drawn hole, the spiral inner die is arranged opposite to the cold-drawn hole on the left and right, and the right end of the guide rod is fixedly connected to the left side of the die base.

[0021] The die base is fixedly connected to the frame, so that the cold drawing outer die can be stably positioned on the frame, the cold drawing hole passes through the die base, and the spiral inner die is opposite to the cold drawing hole, so that the spiral inner die and the steel pipe sleeved outside the spiral inner die can be sent into the cold drawing hole under the push of the cylinder.

[0022] In the above-mentioned cold-drawn inner die mechanism for internally threaded seamless steel pipes, the left side of the die base is provided with a boss protruding to the left below the cold-drawn hole, and an arc-shaped bracket is fixedly connected to the boss. The upper surface of the arc-shaped bracket is in the shape of an arc and the center of the arc is located on the axis line of the cold-drawn hole.

[0023] The setting of the boss and the arc-shaped bracket can support the steel pipe to be processed to ensure the normal operation of the feeding and cold drawing process, and avoid the steel pipe being deflected downward due to its own weight and unable to be accurately fed into the cold drawing hole.

[0024] In the above-mentioned internal thread seamless steel pipe cold drawing inner die mechanism, the boss and the die base are an integrated structure.

[0025] The boss and the mold base are an integrated structure, making the overall structure more compact and stable.

[0026] Compared with the prior art, the cold-drawn inner die mechanism of the internally threaded seamless steel pipe is convenient for loading and feeding materials. When the pushing component is in the initial state, the spiral inner die is away from the cold-drawn outer die, which is convenient for the operator to put the steel pipe to be processed on the spiral inner die, and then push it into the cold-drawn outer die for the cold-drawing process under the action of the pushing component, which is more convenient and labor-saving; the work efficiency is high, the rotating component can drive the spiral inner die to rotate, and the oil delivery component can deliver lubricating oil to the steel pipe and between the spiral inner die for lubrication, thereby promoting the cold drawing process of the steel pipe and the formation of the internal thread. The formed internal thread is smoother, the burrs are reduced, and the production quality of the internally threaded seamless steel pipe is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of the cold-drawn inner die mechanism of the internally threaded seamless steel pipe;

[0028] Figure 2 It is a partial cross-sectional view of the cold-drawn inner die mechanism of the internally threaded seamless steel pipe;

[0029] Figure 3 It is a left view of the cold drawing outer die in the cold drawing inner die mechanism of the internally threaded seamless steel pipe.

[0030] In the figure, 1, frame; 2, spiral inner mold; 3, motor; 4, driving wheel; 5, driven wheel; 6, transmission belt; 7, housing; 8, conduit; 9, rotary joint; 10, hose; 11, cylinder; 12, support plate; 13, connecting seat; 14, guide rod; 15, guide hole; 16, mold base; 17, cold drawing hole; 18, boss; 19, arc bracket. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly mounted on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0034] like Figure 1 As shown in —3, the cold-drawn inner die mechanism of the internally threaded seamless steel pipe comprises a frame 1 and a cold-drawn outer die, wherein the cold-drawn outer die is fixedly connected to the upper right end of the frame 1, and further comprises a spiral inner die 2, a rotating assembly, a propulsion assembly and an oil delivery assembly, wherein the propulsion assembly is arranged horizontally and the left end of the propulsion assembly is fixedly connected to the upper left end of the frame 1, and the right end of the propulsion assembly is fixedly connected to the rotating assembly, the outer side of the spiral inner die 2 has a spiral pattern, the spiral inner die 2 is fixedly connected to the right end of the rotating assembly and the spiral inner die 2 is opposite to the cold-drawn outer die on the left and right sides, and the oil delivery assembly is arranged between the spiral inner die 2 and the rotating assembly, the oil delivery assembly can deliver lubricating oil to the spiral inner die 2, and the above-mentioned rotating assembly can drive the spiral inner die 2 to rotate through the oil delivery assembly, in the initial state, the spiral inner die 2 is away from the cold-drawn outer die, and when the propulsion assembly is running, the propulsion assembly can push the rotating assembly to move to the right, and the rotating assembly drives the spiral inner die 2 to move to the right until the spiral inner die 2 is embedded in the cold-drawn outer die.

[0035] The rotating assembly includes a motor 3, a driving wheel 4, a driven wheel 5, a transmission belt 6 and a housing 7. The housing 7 is coated on the outside of the driving wheel 4, the driven wheel 5 and the transmission belt 6. The driving wheel 4 and the driven wheel 5 are axially fixed in the housing 7 and can rotate circumferentially. The driven wheel 5 is arranged vertically opposite to the driving wheel 4. The transmission belt 6 is sleeved on the driving wheel 4 and the driven wheel 5. The motor 3 is fixedly connected to the outside of the right side of the housing 7. The output shaft of the motor 3 extends into the housing 7 and is connected to the driving wheel 4. The driven wheel 5 is fixedly connected to the oil delivery assembly.

[0036] The oil delivery assembly includes a conduit 8, a rotary joint 9 and a hose 10. The rotary joint 9 is arranged on the left side of the shell 7. The input end of the rotary joint 9 is connected to the hose 10. The other end of the hose 10 can be connected to an external oil delivery pump. The output end of the rotary joint 9 is connected to the conduit 8. The conduit 8 is sequentially arranged from left to right on the left side of the shell 7, the driven wheel 5, and the right side of the shell 7 and extends from the right side of the shell 7. The conduit 8 is fixedly connected to the driven wheel 5 and can rotate relative to the shell 7 under the drive of the driven wheel 5. The right end of the conduit 8 is fixedly connected to the spiral inner mold 2 and the conduit 8 has a penetrating oil outlet near the spiral inner mold 2.

[0037] The propulsion assembly includes a cylinder 11 and a support plate 12. The support plate 12 is vertically fixed to the upper left end of the frame 1. The cylinder 11 is fixed to the right side of the support plate 12 and is parallel to the upper surface of the frame 1. The piston rod end of the cylinder 11 is fixed to the middle left side of the shell 7.

[0038] The motor 3 is fixedly connected to the housing 7 via a connecting seat 13 . The connecting seat 13 is located at the lower part of the housing 7 and the motor 3 . The housing 7 is fixedly connected to the connecting seat 13 , and the motor 3 is fixedly connected to the connecting seat 13 .

[0039] It also includes a guide rod 14, which is arranged parallel to the upper surface of the frame 1. The side of the connecting seat 13 has a penetrating guide hole 15, and the guide rod 14 matches the guide hole 15. The guide rod 14 is inserted into the guide hole 15 and the two are slidably connected. The left end of the guide rod 14 is fixedly connected to the support plate 12, and the right end of the guide rod 14 is fixedly connected to the side of the cold drawing outer mold.

[0040] There are a plurality of oil outlet holes, which are arranged in a circular array along the pipe body of the conduit 8 .

[0041] The cold drawing outer die comprises a die base 16 , and the die base 16 has a penetrating cold drawing hole 17 . The spiral inner die 2 is arranged opposite to the cold drawing hole 17 , and the right end of the guide rod 14 is fixedly connected to the left side of the die base 16 .

[0042] The left side of the die base 16 is provided with a boss 18 protruding to the left below the cold drawing hole 17 , and an arc-shaped bracket 19 is fixedly connected to the boss 18 . The upper surface of the arc-shaped bracket 19 is arc-shaped and the center of the arc is located on the axis line of the cold drawing hole 17 .

[0043] The boss 18 and the mold base 16 are an integrated structure.

[0044] The cold-drawn inner die mechanism for an internally threaded seamless steel pipe is used for the internal thread and cold-drawing processing of seamless steel pipes. The shape of the internal thread is determined by setting a spiral inner die 2, and a rotating component is set to drive the spiral inner die 2 to rotate, so that the inner wall of the steel pipe after cold drawing can form an internal thread with smooth thread connection. The feeding is facilitated by setting a pushing component, and the pushing component can push the steel pipe to be processed and the spiral inner die 2 to the cold-drawing outer die together, saving manpower and facilitating subsequent cold drawing. The oil delivery component is set to facilitate the continuous delivery of lubricating oil into the steel pipe during the cold drawing process, so that the spiral inner die 2 rotates more smoothly, which promotes the cold drawing process of the internal thread, thereby making the pitch of the internal thread of the seamless steel pipe after cold drawing more uniform, reducing the possibility of burrs on the thread, and improving the quality of the internally threaded seamless steel pipe.

[0045] When the cold-drawn inner die mechanism for internally threaded seamless steel pipe is in use, the spiral inner die is away from the cold-drawn outer die, and the operator puts the steel pipe to be processed from the right end of the spiral inner die onto the outside of the spiral inner die, and then pushes the steel pipe and the spiral inner die into the cold-drawn outer die for cold drawing under the action of the pushing component. During the cold drawing process, the rotating component continuously drives the spiral inner die to rotate, and the oil delivery component continuously delivers lubricating oil to the steel pipe and between the spiral inner die for lubrication, so that the steel pipe forms a smooth internal thread during the cold drawing process, and the possibility of burrs on the thread is reduced under the action of the lubricating oil, thereby improving the quality of the internally threaded seamless steel pipe formed after cold drawing.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. A cold-drawn inner die mechanism for an internally threaded seamless steel pipe, comprising a frame and a cold-drawn outer die, wherein the cold-drawn outer die is fixedly connected to the upper right end of the frame, and is characterized in that: It also includes a spiral inner mold, a rotating component, a propulsion component and an oil delivery component. The propulsion component is arranged horizontally and the left end of the propulsion component is fixedly connected to the upper left end of the frame, the right end of the propulsion component is fixedly connected to the rotating component, the outer side of the spiral inner mold has a spiral pattern, the spiral inner mold is fixedly connected to the right end of the rotating component and the spiral inner mold is directly opposite to the cold-drawn outer mold on the left and right, the oil delivery component is arranged between the spiral inner mold and the rotating component, the oil delivery component can deliver lubricating oil to the spiral inner mold, and the above-mentioned rotating component can drive the spiral inner mold to rotate through the oil delivery component. In the initial state, the spiral inner mold is away from the cold-drawn outer mold. When the propulsion component is running, the propulsion component can push the rotating component to move to the right, and the rotating component drives the spiral inner mold to move to the right until the spiral inner mold is embedded in the cold-drawn outer mold.

2. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 1, characterized in that: The rotating assembly includes a motor, a driving wheel, a driven wheel, a transmission belt and a housing, wherein the housing is coated on the outside of the driving wheel, the driven wheel and the transmission belt, the driving wheel and the driven wheel are axially fixed in the housing and can rotate circumferentially, the driven wheel and the driving wheel are arranged vertically opposite to each other, the transmission belt is sleeved on the driving wheel and the driven wheel, the motor is fixedly connected to the outside of the right side of the housing, the output shaft of the motor extends into the housing and is connected to the driving wheel, and the driven wheel is fixedly connected to the oil delivery assembly.

3. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 2, characterized in that: The oil delivery assembly includes a conduit, a rotary joint and a hose. The rotary joint is arranged on the left side of the shell. The input end of the rotary joint is connected to a hose. The other end of the hose can be connected to an external oil delivery pump. The output end of the rotary joint is connected to a conduit. The conduit is sequentially arranged from left to right on the left side of the shell, the driven wheel, and the right side of the shell and extends from the right side of the shell. The conduit is fixedly connected to the driven wheel and can rotate relative to the shell under the drive of the driven wheel. The right end of the conduit is fixedly connected to the spiral inner mold and the conduit body has a penetrating oil outlet hole near the spiral inner mold.

4. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 3, characterized in that: The propulsion assembly includes a cylinder and a support plate, wherein the support plate is vertically fixed to the upper left end of the frame, the cylinder is fixed to the right side of the support plate and the cylinder is parallel to the upper surface of the frame, and the piston rod end of the cylinder is fixed to the middle left side of the shell.

5. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 4, characterized in that: The motor is fixedly connected to the shell through a connecting seat, the connecting seat is located at the lower part of the shell and the motor, the shell is fixedly connected to the connecting seat, and the motor is fixedly connected to the connecting seat.

6. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 5, characterized in that: It also includes a guide rod, which is arranged parallel to the upper surface of the frame. The side of the connecting seat has a penetrating guide hole. The guide rod matches the guide hole. The guide rod is inserted into the guide hole and the two are slidably connected. The left end of the guide rod is fixedly connected to the support plate, and the right end of the guide rod is fixedly connected to the side of the cold-drawn outer mold.

7. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 6, characterized in that: There are a plurality of oil outlet holes, which are arranged in a circular array along the pipe body of the conduit.

8. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 7, characterized in that: The cold drawing outer die comprises a die base, the die base is provided with a penetrating cold drawing hole, the spiral inner die is arranged opposite to the cold drawing hole, and the right end of the guide rod is fixedly connected to the left side of the die base.

9. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 8, characterized in that: The left side of the die base is provided with a boss protruding to the left below the cold drawing hole, and an arc-shaped bracket is fixedly connected to the boss. The upper surface of the arc-shaped bracket is in an arc shape, and the center of the arc is located on the axis line of the cold drawing hole.

10. The cold-drawing inner die mechanism for an internally threaded seamless steel pipe according to claim 9, characterized in that: The boss and the mold base are an integrated structure.

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