An automatic cold drawing machine for processing seamless steel pipes

Abstract

This invention relates to the technical field of seamless steel pipe production equipment, and more particularly to an automatic cold drawing machine for processing seamless steel pipes, comprising: a base, a conveyor frame, a mounting frame, a cold drawing die, and a drawing mechanism; the conveyor frame and the mounting frame are fixedly connected to the base; the cold drawing die is mounted on the mounting frame; this invention, by setting two sets of stepping rotating mechanisms on the base, allows the seamless steel pipe to rotate alternately, thereby rotating the seamless steel pipe during the cold drawing process. This ensures uniform stress on the seamless steel pipe in the circumferential direction, avoids excessive deformation on one side, and reduces dimensional deviations such as ellipticity and uneven wall thickness. Simultaneously, rotation prevents continuous high-intensity friction between the steel pipe and the die in the same area, reducing local overheating and severe wear. Furthermore, rotating the seamless steel pipe disperses stress circumferentially during the cold drawing process, reducing excessive residual stress in certain areas, thereby improving the fatigue strength and service life of the steel pipe.

Description

Technical Field

[0001] The invention relates to the technical field of seamless steel pipe production equipment, in particular to an automatic cold drawing machine for processing seamless steel pipes. Background Art

[0002] Seamless steel pipe is an important material widely used in modern industry, playing a key role in many fields such as machinery manufacturing, petrochemical industry, aerospace, etc. Seamless steel pipe cold drawing machine is a key equipment for producing seamless steel pipe. Its technology is constantly developing and evolving. It adopts high-precision molds and powerful drawing power system, which can realize efficient cold drawing of steel pipes of different materials and specifications. Cold drawing machine usually consists of power system, drawing trolley, mold, clamping device and other parts. The power system provides the power required for drawing, the drawing trolley clamps the steel pipe and moves on the track, the mold determines the final shape and size of the steel pipe, and the clamping device ensures that the steel pipe is stable and does not slide during the drawing process.

[0003] Among them, cold drawing and shrinking of seamless steel pipes is an important process for cold processing of seamless steel pipes. In this process, the seamless steel pipe is passed through a die with a specific size, and then a pulling force is applied to make the steel pipe pass through the die, thereby reducing the diameter of the steel pipe, improving the dimensional accuracy of the steel pipe, improving the surface finish of the seamless steel pipe, and enhancing the tensile strength and yield strength of the seamless steel pipe;

[0004] During the cold drawing and shrinking process of seamless steel pipes, due to the continuous friction between the steel pipe and the same part of the mold, it will cause severe local wear, surface scratches, grooves and other defects, affecting the surface quality of the steel pipe. At the same time, excessive local force and deformation can easily cause uneven diameter and wall thickness of the steel pipe, increase ovality, thereby reducing dimensional accuracy and causing limitations.

[0005] To this end, we propose an automatic cold drawing machine for seamless steel pipe processing. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an automatic cold drawing machine for processing seamless steel pipes, which overcomes the deficiencies in the prior art and aims to solve the problems in the background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: an automatic cold drawing machine for processing seamless steel pipes, comprising:

[0008] A base, a conveying frame, a mounting frame, a cold drawing die and a drawing mechanism; the conveying frame and the mounting frame are fixedly connected to the base; the cold drawing die is mounted on the mounting frame; the drawing mechanism is mounted on the base; the seamless steel pipe is transported to the front of the cold drawing die on the mounting frame through the conveying frame; a clamp is provided on the drawing mechanism; the clamp is rotatably connected to the drawing mechanism;

[0009] The base is provided with a stepping rotating mechanism; while the drawing mechanism pulls the seamless steel pipe, the stepping rotating mechanism clamps the seamless steel pipe, pushes the seamless steel pipe forward and rotates the seamless steel pipe at the same time.

[0010] Preferably, the stepping rotating mechanism comprises a mounting block, a reciprocating moving block, a circular ring block and a clamping block; the mounting block is fixedly connected to both sides of the base, and a reciprocating moving groove is provided on the mounting block; the reciprocating moving block is slidably connected in the reciprocating moving groove; the mounting block is fixedly connected to a reciprocating motor; the output end of the reciprocating motor is fixedly connected to a screw rod which threadably cooperates with the reciprocating moving block; the circular ring block is fixedly connected to the two reciprocating moving blocks; the circular ring block is provided with a toothed groove; the bottom of the toothed groove is arranged into a toothed ring shape, and a pair of sliding blocks are slidably connected in the toothed groove; the sliding block is fixedly connected to a sliding motor; the output end of the sliding motor is fixedly connected to a sliding gear which meshes with the bottom of the toothed groove; the sliding block is provided with a clamping groove; the clamping block is slidably connected in the clamping groove; a clamping electric push rod is fixedly connected between the sliding block and the clamping block.

[0011] Preferably, two groups of the stepping and rotating mechanisms are arranged side by side on the base; the two groups of the stepping and rotating mechanisms push and rotate the seamless steel pipe alternately.

[0012] Preferably, a friction block is mounted on the clamping block; the friction block is made of a flexible material to increase friction, such as rubber.

[0013] By arranging two sets of stepping rotating mechanisms on the base, the stepping rotating mechanisms rotate the seamless steel pipe alternately, so that the seamless steel pipe rotates during the cold drawing process, so that the seamless steel pipe is subjected to uniform force in the circumferential direction, avoiding excessive deformation on one side, reducing dimensional deviations such as ovality and uneven wall thickness, and at the same time, rotation can avoid continuous high-intensity friction between the steel pipe and the mold at the same position, reducing local overheating and severe wear, and rotating the seamless steel pipe disperses the stress in the circumferential direction during the cold drawing process, reducing local excessive residual stress, thereby improving the fatigue strength and service life of the steel pipe.

[0014] Preferably, a telescopic slot is provided on the base; a telescopic electric push rod is fixedly connected in the telescopic slot, and a telescopic block is slidably connected in the telescopic slot; the telescopic block is fixedly connected to the output end of the telescopic electric push rod; a concave block is rotatably connected to the telescopic block, and a rotatable electric push rod is hinged on the telescopic block; an opening is provided on the concave block; the output end of the rotatable electric push rod is hinged to the concave block.

[0015] By arranging a telescopic block and a concave block on the base, the concave block bends the pipe mouth of the seamless steel pipe so that the pipe mouth of the seamless steel pipe bends inward, thereby making the pipe mouth diameter of the seamless steel pipe smaller than the diameter of the seamless steel pipe, thereby facilitating the pipe mouth of the seamless steel pipe to enter the cold drawing die, thereby facilitating the drawing of the drawing mechanism.

[0016] Preferably, a spring telescopic sleeve rod is fixedly connected to the base; a cleaning block is fixedly connected to the spring telescopic sleeve rod; and cleaning cotton is fixedly connected to the cleaning block.

[0017] Preferably, the cleaning block is in an inverted W shape.

[0018] Preferably, a pair of support rods are fixedly connected to the base; a support ring is fixedly connected to the support rod; a support block is fixedly connected inside the support ring; a support spring is fixedly connected to the support block; a contact block is fixedly connected to the support spring; and the contact block is bent outward at one end away from the pulling mechanism.

[0019] By arranging a cleaning block and cleaning cotton on the base, the seamless steel pipe is cleaned to prevent impurities from adhering to the seamless steel pipe and affecting the cold drawing effect. At the same time, a support ring and a contact block are arranged so that the contact block supports the seamless steel pipe in the circumferential direction of the outer side of the seamless steel pipe, thereby reducing the vibration of the seamless steel pipe during the cold drawing process.

[0020] Beneficial effects of the present invention:

[0021] 1. The present invention arranges two sets of stepping rotating mechanisms on the base so that the stepping rotating mechanisms rotate the seamless steel pipe alternately, so that the seamless steel pipe rotates during the cold drawing process, so that the seamless steel pipe is subjected to uniform force in the circumferential direction, thereby avoiding excessive deformation on one side and reducing dimensional deviations such as ovality and uneven wall thickness. At the same time, the rotation can avoid continuous high-intensity friction between the steel pipe and the mold at the same position, reducing local overheating and severe wear. In addition, the rotation of the seamless steel pipe disperses the stress in the circumferential direction during the cold drawing process, reducing the local excessive residual stress, thereby improving the fatigue strength and service life of the steel pipe.

[0022] 2. The present invention arranges a telescopic block and a concave block on the base, so that the concave block bends the pipe mouth of the seamless steel pipe, causing the pipe mouth of the seamless steel pipe to bend inward, thereby making the pipe mouth diameter of the seamless steel pipe smaller than the diameter of the seamless steel pipe, thereby facilitating the pipe mouth of the seamless steel pipe to enter the cold drawing die, thereby facilitating the drawing of the drawing mechanism.

[0023] 3. The present invention cleans the seamless steel pipe by arranging a cleaning block and cleaning cotton on the base, thereby preventing impurities from adhering to the seamless steel pipe and affecting the cold drawing effect. At the same time, a support ring and a contact block are arranged so that the contact block supports the seamless steel pipe in the circumferential direction of the outer side of the seamless steel pipe, thereby reducing the vibration of the seamless steel pipe during the cold drawing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0026] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0027] Figure 4 It is a cross-sectional view of the circular ring block, the sliding block and the clamping block in the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the base, telescopic block and concave block in the present invention;

[0029] Figure 6 It is a partial cross-sectional view of the base, telescopic block and concave block in the present invention.

[0030] In the figure: 1. base; 11. conveying frame; 12. mounting frame; 13. cold drawing die; 14. drawing mechanism; 15. fixture; 21. mounting block; 22. reciprocating block; 23. circular ring block; 24. clamping block; 25. reciprocating groove; 26. reciprocating motor; 27. toothed groove; 28. sliding block; 29. ​​sliding motor; 3. sliding gear; 31. clamping groove; 32. clamping electric push rod; 33. friction block; 4. telescopic groove; 41. telescopic electric push rod; 42. telescopic block; 43. concave block; 44. rotating electric push rod; 5. spring telescopic sleeve rod; 51. cleaning block; 52. cleaning cotton; 6. support rod; 61. support ring; 62. support block; 63. support spring; 64. contact block. DETAILED DESCRIPTION

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

[0032] Embodiment 1: Refer to the attached specification Figure 1 , 2 , 3, 4, 5 and 6, an automatic cold drawing machine for processing seamless steel pipes, comprising:

[0033] Base 1, conveying frame 11, mounting frame 12, cold drawing die 13 and drawing mechanism 14; conveying frame 11 and mounting frame 12 are fixedly connected to base 1; cold drawing die 13 is mounted on mounting frame 12; drawing mechanism 14 is mounted on base 1; seamless steel pipe is conveyed to the front of cold drawing die 13 on mounting frame 12 through conveying frame 11; drawing mechanism 14 is provided with fixture 15; fixture 15 is rotatably connected to drawing mechanism 14;

[0034] A stepping rotating mechanism is provided on the base 1; while the drawing mechanism 14 pulls the seamless steel pipe, the stepping rotating mechanism clamps the seamless steel pipe, pushes the seamless steel pipe forward and rotates the seamless steel pipe at the same time.

[0035] In the present invention, the stepping rotating mechanism includes a mounting block 21, a reciprocating block 22, a circular ring block 23 and a clamping block 24; the mounting block 21 is fixedly connected to both sides of the base 1, and a reciprocating groove 25 is provided on the mounting block 21; the reciprocating block 22 is slidably connected in the reciprocating groove 25; a reciprocating motor 26 is fixedly connected to the mounting block 21; a screw rod which is threadedly matched with the reciprocating block 22 is fixedly connected to the output end of the reciprocating motor 26; the circular ring block 23 is fixedly connected to the two reciprocating blocks 22 The circular ring block 23 is provided with a toothed groove 27; the bottom of the toothed groove 27 is arranged in a toothed ring shape, and a pair of sliding blocks 28 are slidably connected in the toothed groove 27; a sliding motor 29 is fixedly connected to the sliding block 28; the output end of the sliding motor 29 is fixedly connected to a sliding gear 3 meshing with the bottom of the toothed groove 27; a clamping groove 31 is provided on the sliding block 28; the clamping block 24 is slidably connected in the clamping groove 31; a clamping electric push rod 32 is fixedly connected between the sliding block 28 and the clamping block 24.

[0036] In the present invention, two groups of step-by-step rotating mechanisms are arranged side by side on the base 1; the two groups of step-by-step rotating mechanisms push and rotate the seamless steel pipe alternately.

[0037] In the present invention, a friction block 33 is installed on the clamping block 24; the friction block 33 is made of a flexible material to increase friction, such as rubber.

[0038] In the present invention, the seamless steel pipe is transmitted to the conveying frame 11 and is transmitted forward through the conveying frame 11. When the seamless steel pipe reaches the front of the mounting frame 12, the clamping electric push rod 32 of one set of stepping rotating mechanisms pushes the clamping block 24, so that the two clamping blocks 24 are clamped on both sides of the seamless steel pipe, and then the reciprocating motor 26 drives the corresponding screw rod to rotate, so that the reciprocating moving block 22 moves forward, and at the same time, the sliding motor 29 drives the corresponding sliding gear 3 to rotate, so that the sliding block 28 moves in the tooth groove 27, so that the two sliding blocks 28 in the tooth groove 27 drive the corresponding clamping block 24 and the seamless steel pipe to rotate, and after one end of the seamless steel pipe passes through the cold drawing die 13 on the mounting frame 12, the clamp 15 of the drawing mechanism 14 clamps one end of the seamless steel pipe, and then pulls the seamless steel pipe, so that the seamless steel pipe passes through the cold drawing die 13, thereby completing the reduction of the diameter of the seamless steel pipe;

[0039] When the seamless steel pipe passes through the cold drawing die 13, the reciprocating block 22 drives the seamless steel pipe to move forward, and the sliding block 28 drives the seamless steel pipe to rotate. When the reciprocating block 22 of the first group of stepping rotating mechanisms moves to the end, the clamping block 24 of the second group of stepping rotating mechanisms clamps the seamless steel pipe, so that the two groups of stepping rotating mechanisms rotate the seamless steel pipe alternately, so that the seamless steel pipe rotates during the entire cold drawing process.

[0040] Rotating the seamless steel pipe makes the stress on the seamless steel pipe uniform in the circumferential direction, avoiding excessive deformation on one side. In this way, during the cold drawing process, the diameter reduction and elongation of each part of the seamless steel pipe are relatively consistent, thereby reducing dimensional deviations such as ovality and uneven wall thickness, as well as irregular shapes such as bending and twisting, and improving the dimensional accuracy and shape accuracy of the seamless steel pipe; at the same time, rotating the seamless steel pipe makes the stress dispersed in the circumferential direction during the cold drawing process, reducing the excessive residual stress locally, thereby improving the fatigue strength and service life of the seamless steel pipe;

[0041] In the present invention, a friction block 33 made of a flexible material is arranged on the clamping block 24, so that the clamping block 24 has a greater friction force when clamping the seamless steel pipe, and will not scratch the surface of the seamless steel pipe;

[0042] The present invention arranges two groups of stepping rotating mechanisms on the base 1 so that the stepping rotating mechanisms rotate the seamless steel pipe alternately, so that the seamless steel pipe rotates during the cold drawing process, so that the seamless steel pipe is subjected to uniform force in the circumferential direction, thereby avoiding excessive deformation on one side and reducing dimensional deviations such as ovality and uneven wall thickness. At the same time, the rotation can avoid continuous high-intensity friction between the steel pipe and the mold at the same position, reducing local overheating and severe wear. In addition, the rotation of the seamless steel pipe disperses the stress in the circumferential direction during the cold drawing process, reducing local excessive residual stress, thereby improving the fatigue strength and service life of the steel pipe.

[0043] In the present invention, a telescopic slot 4 is provided on the base 1; a telescopic electric push rod 41 is fixedly connected in the telescopic slot 4, and a telescopic block 42 is slidably connected in the telescopic slot 4; the telescopic block 42 is fixedly connected to the output end of the telescopic electric push rod 41; a concave block 43 is rotatably connected to the telescopic block 42, and a rotating electric push rod 44 is hinged on the telescopic block 42; an opening is provided on the concave block 43; the output end of the rotating electric push rod 44 is hinged to the concave block 43.

[0044] In the present invention, after the seamless steel pipe reaches the front of the mounting frame 12, the telescopic electric push rod 41 pushes the telescopic block 42 upward, and then pushes the seamless steel pipe forward, so that the pipe wall of the seamless steel pipe is inserted into the opening on the concave block 43, and then the electric push rod 44 is rotated to pull the concave block 43 downward, so that the concave block 43 bends the pipe wall of the seamless steel pipe downward, and then the sliding block 28 drives the seamless steel pipe to rotate, changing the position of the pipe mouth of the seamless steel pipe, and the concave block 43 is bent downward again until the pipe mouth of the seamless steel pipe is bent to a diameter smaller than the seamless steel pipe, thereby facilitating the seamless steel pipe to initially enter the cold drawing die 13;

[0045] The present invention arranges a telescopic block 42 and a concave block 43 on the base 1, so that the concave block 43 bends the pipe mouth of the seamless steel pipe, so that the pipe mouth of the seamless steel pipe bends inward, thereby making the pipe mouth diameter of the seamless steel pipe smaller than the diameter of the seamless steel pipe, thereby facilitating the pipe mouth of the seamless steel pipe to enter the cold drawing die 13, thereby facilitating the drawing of the drawing mechanism 14.

[0046] Embodiment 2: Based on Embodiment 1, refer to the attached Figure 2 and 3 In the present invention, a spring telescopic sleeve rod 5 is fixedly connected to the base 1; a cleaning block 51 is fixedly connected to the spring telescopic sleeve rod 5; and a cleaning cotton 52 is fixedly connected to the cleaning block 51.

[0047] In the present invention, the shape of the cleaning block 51 is an inverted W shape.

[0048] In the present invention, a pair of support rods 6 are fixedly connected to the base 1; a support ring 61 is fixedly connected to the support rod 6; a support block 62 is fixedly connected inside the support ring 61; a support spring 63 is fixedly connected to the support block 62; a contact block 64 is fixedly connected to the support spring 63; and the contact block 64 is bent outward at one end away from the pulling mechanism 14.

[0049] In the present invention, after the seamless steel pipe is transferred to the conveying rack 11, since the conveying racks 11 on both sides are tilted inward, the seamless steel pipe moves to the middle position of the conveying racks 11 on both sides. During the movement of the seamless steel pipe, the seamless steel pipe contacts the concave part in the middle of the cleaning block 51 after passing through the inverted W-shaped cleaning block 51. Therefore, during the process of the seamless steel pipe moving forward and rotating, the seamless steel pipe is wiped by the cleaning cotton 52 on the cleaning block 51, which has a cleaning effect, thereby preventing impurities from adhering to the seamless steel pipe and affecting the effect of cold drawing.

[0050] In the present invention, a support ring 61 and a support block 62 are arranged on the base 1. When the seamless steel pipe moves to the conveying frame 11, it passes through the middle of the contact block 64, so that the contact block 64 supports the seamless steel pipe on the outside of the seamless steel pipe; during the rotation of the seamless steel pipe, the contact block 64 can provide uniform support force, and the support spring 63 can play a buffering role, absorbing the impact force of the seamless steel pipe jumping during the rotation and rotation drawing process, and reducing the amplitude of the jumping;

[0051] The present invention cleans the seamless steel pipe by arranging a cleaning block 51 and a cleaning cotton 52 on the base 1, thereby preventing impurities from adhering to the seamless steel pipe and affecting the cold drawing effect. At the same time, a support ring 61 and a contact block 64 are arranged, so that the contact block 64 supports the seamless steel pipe in the circumferential direction of the outer side of the seamless steel pipe, thereby reducing the vibration of the seamless steel pipe during the cold drawing process.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected; the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An automatic cold drawing machine for seamless steel pipe processing, characterized in that: The invention comprises a base (1), a conveying frame (11), a mounting frame (12), a cold drawing die (13) and a drawing mechanism (14); the conveying frame (11) and the mounting frame (12) are fixedly connected to the base (1); the cold drawing die (13) is mounted on the mounting frame (12); the drawing mechanism (14) is mounted on the base (1); the seamless steel pipe is conveyed to the front of the cold drawing die (13) on the mounting frame (12) through the conveying frame (11); a clamp (15) is arranged on the drawing mechanism (14); the clamp (15) is rotatably connected to the drawing mechanism (14); The base (1) is provided with a stepping rotating mechanism; while the drawing mechanism (14) is pulling the seamless steel pipe, the stepping rotating mechanism clamps the seamless steel pipe, pushes the seamless steel pipe forward and rotates the seamless steel pipe at the same time; The stepping rotary mechanism comprises a mounting block (21), a reciprocating block (22), a circular ring block (23) and a clamping block (24); the mounting block (21) is fixedly connected to both sides of the base (1); a reciprocating groove (25) is provided on the mounting block (21); the reciprocating block (22) is slidably connected in the reciprocating groove (25); a reciprocating motor (26) is fixedly connected to the mounting block (21); a screw rod threadably matched with the reciprocating block (22) is fixedly connected to the output end of the reciprocating motor (26); the circular ring block (23) is fixedly connected to the two reciprocating blocks (22); A toothed groove (27) is formed on the annular block (23); the bottom of the toothed groove (27) is configured to be a toothed ring; a pair of sliding blocks (28) are slidably connected in the toothed groove (27); a sliding motor (29) is fixedly connected to the sliding block (28); an output end of the sliding motor (29) is fixedly connected to a sliding gear (3) meshing with the bottom of the toothed groove (27); a clamping groove (31) is formed on the sliding block (28); the clamping block (24) is slidably connected in the clamping groove (31); and a clamping electric push rod (32) is fixedly connected between the sliding block (28) and the clamping block (24).

2. The automatic cold drawing machine for seamless steel pipe processing according to claim 1, characterized in that: Two groups of the stepping rotating mechanisms are arranged side by side on the base (1); the two groups of the stepping rotating mechanisms push and rotate the seamless steel pipe alternately.

3. The automatic cold drawing machine for seamless steel pipe processing according to claim 2, characterized in that: A friction block (33) is mounted on the clamping block (24); the friction block (33) is made of a flexible material.

4. The automatic cold drawing machine for processing seamless steel pipes according to claim 3, characterized in that: The base (1) is provided with a telescopic slot (4); a telescopic electric push rod (41) is fixedly connected in the telescopic slot (4); a telescopic block (42) is slidably connected in the telescopic slot (4); the telescopic block (42) is fixedly connected to the output end of the telescopic electric push rod (41); a concave block (43) is rotatably connected to the telescopic block (42); a rotatable electric push rod (44) is hingedly connected to the telescopic block (42); an opening is provided in the concave block (43); and the output end of the rotatable electric push rod (44) is hingedly connected to the concave block (43).

5. The automatic cold drawing machine for processing seamless steel pipes according to claim 4, characterized in that: A spring telescopic sleeve rod (5) is fixedly connected to the base (1); a cleaning block (51) is fixedly connected to the spring telescopic sleeve rod (5); and a cleaning cotton (52) is fixedly connected to the cleaning block (51).

6. The automatic cold drawing machine for processing seamless steel pipes according to claim 5, characterized in that: The cleaning block (51) is in an inverted W shape.

7. The automatic cold drawing machine for processing seamless steel pipes according to claim 6, characterized in that: A pair of support rods (6) are fixedly connected to the base (1); a support ring (61) is fixedly connected to the support rod (6); a support block (62) is fixedly connected inside the support ring (61); a support spring (63) is fixedly connected to the support block (62); a contact block (64) is fixedly connected to the support spring (63); an end of the contact block (64) away from the pulling mechanism (14) is bent outwards.

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