Cold rolling device for seamless steel pipe production

Abstract

The invention relates to a cold rolling device for seamless steel pipe production, which is applied to the technical field of steel pipe processing and comprises a hydraulic machine body, a die head, a cold rolling pressing die, a fixed ring die, a steel pipe, a rotating shaft pipe, a fixed supporting head, a screw rod, a rotating supporting head, a supporting ring and an inner supporting block. The distance between the rotary supporting head and the fixed supporting head is shrunk by screwing the screw, the inner supporting block outwards supports the inner wall of the steel pipe, transmission connection between the rotary shaft pipe and the steel pipe is achieved, then the cold rolling pressing die shrinks and extrudes the steel pipe, necking cold rolling machining is conducted on the steel pipe, and every time the steel pipe is subjected to cold rolling necking, the rotary shaft pipe rotates to drive the steel pipe to rotate and adjust once. Multiple cold rolling effectively improves the uniform necking effect of the steel pipe, effectively improves the cold rolling necking quality of the steel pipe, facilitates full-automatic upgrading necking cold rolling machining of the steel pipe, and effectively improves the cold rolling machining efficiency of the steel pipe.

Description

Technical Field

[0001] The present invention relates to a steel pipe cold rolling device, in particular to a cold rolling device for producing seamless steel pipes applied in the technical field of steel pipe processing. Background Art

[0002] Cold-rolled seamless steel pipe is a steel product with a hollow cross-section. It can be divided into round steel pipe, square steel pipe and special-shaped steel pipe according to the cross-sectional shape; it can be divided into seamless steel pipe and welded steel pipe according to the production method. Seamless steel pipe is made of steel ingot or solid tube billet by perforation into rough tube, and then hot rolled, cold rolled or cold drawn; welded steel pipe is made of a whole piece of steel plate after bending and welding. There is a weld on the surface of the welded steel pipe. During the cold-rolled steel pipe processing, the pipe mouth of the steel pipe needs to be shrinked and cold rolled for the butt joint between steel pipes.

[0003] The specification of Chinese invention patent CN202222967841.2 discloses "A steel pipe processing shrinking machine". An automatic stripping component is arranged on the steel pipe limiting mechanism of the shrinking machine. After the shrinking component shrinks the port of the steel pipe, the second hydraulic push rod drives the movable limiting block to move upward, thereby driving the linkage lifting plate to move upward, and then driving the stripping bottom plate to move the steel pipe upward out of the arc-shaped limiting groove on the surface of the fixed limiting block, thereby achieving the effect of automatic stripping, making it convenient for the staff to replace the steel pipe so as to quickly carry out subsequent steel pipe processing.

[0004] Most of the existing cold-rolled shrinkage of steel pipes adopts the mold cold-rolling processing method in the above-mentioned patent. Since the pressurizing direction of the cold-rolling die is fixed, the round steel pipe is easily unevenly pressurized. Therefore, during the cold-rolling process of the steel pipe, the steel pipe needs to be rotated and adjusted. The traditional adjustment method is that workers hold the steel pipe for adjustment. Frequent rotation and adjustment of the steel pipe is labor-intensive, and the rotation angle of the steel pipe is not accurate enough, and it cannot be upgraded to automation, which affects the efficiency of the cold-rolling process of the steel pipe. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that round steel pipes are prone to uneven pressure, the steel pipes are inconvenient to rotate and adjust, the frequent rotation and adjustment of the steel pipes is labor-intensive, and the rotation angle of the steel pipes is not precise enough to be automatically upgraded, which affects the efficiency of the cold rolling processing of the steel pipes.

[0006] In order to solve the above problems, the present invention provides a cold rolling device for producing seamless steel pipes, including a hydraulic body, an output end of the hydraulic body is fixedly connected to a die head, a cold rolling die is inserted on the outside of the die head, and a fixed ring die is fixedly connected to the end of the top of the hydraulic body close to the die head. The cold rolling die and the fixed ring die are sleeved, and a steel pipe is inserted between the cold rolling die and the fixed ring die; a rotating shaft tube is inserted in the middle of the cold rolling die, an end of the rotating shaft tube away from the die head is fixedly connected to a fixed support head, the fixed support head extends out of the cold rolling die, an end of the rotating shaft tube close to the fixed support head is internally threadedly connected to a screw, an end of the screw extending out of the fixed support head is fixedly connected to a rotating support head, an end of the rotating support head close to the fixed support head is rotatably connected to a support ring, an inner support block is hinged between the support ring and the fixed support head, and the inner support block is in close contact with the inner wall of the steel pipe.

[0007] In the above-mentioned cold rolling device for seamless steel pipe production, the distance between the rotating support head and the fixed support head is shortened by tightening the screw, so that the inner support block supports the inner wall of the steel pipe outward, thereby realizing the transmission connection between the rotating shaft tube and the steel pipe, facilitating the rotation of the steel pipe during the cold rolling shrinking process, facilitating uniform shrinking of the steel pipe, and effectively improving the cold rolling shrinking quality of the steel pipe.

[0008] As a further improvement of the present application, the cold rolling die is arranged in a truncated cone shape, and is composed of a ring-distributed pressing module. The outer inclined surface of the pressing module is in active contact with the inner ring surface of the fixed ring die. When the cold rolling die is extruded toward the fixed ring die, the inclined surface of the pressing module is squeezed by the inner ring of the fixed ring die, so that the pressing module can evenly gather and extrude the steel pipe, effectively improving the cold rolling shrinkage quality of the steel pipe.

[0009] As a further improvement of the present application, a driving gear is fixedly connected to one end of the rotating shaft tube close to the die head, and a U-shaped groove is provided on the top of the die head, and the U-shaped groove is engaged with the driving gear. By placing the driving gear into the U-shaped groove, the cold rolling die can be quickly installed on the die head, thereby improving the installation and replacement efficiency of the cold rolling die.

[0010] As a further improvement of the present application, a push-pull cylinder is fixedly connected to the top of the die head, and a push-pull pressure plate is hinged at the output end of the push-pull cylinder. The push-pull pressure plate is mounted on the top of the U-shaped groove, and the bottom of the push-pull pressure plate is meshed with the driving gear. The push-pull pressure plate is used to close the top of the U-shaped groove to prevent the driving gear from detaching from the U-shaped groove. At the same time, the push-pull pressure plate is meshed to drive the driving gear to realize repeated rotation of the rotating shaft tube.

[0011] As another improvement of the present application, the cylinder end of the push-pull cylinder is fixedly connected to a horizontal rail, and the top of the push-pull pressure plate is movably connected to the horizontal rail. The push-pull cylinder is extended and retracted to drive the push-pull pressure plate to move, so that the push-pull pressure plate engages and drives the driving gear to realize repeated rotation of the rotating shaft tube.

[0012] As another improvement supplement of the present application, a movable groove is opened in the middle of the rotating shaft tube, and the movable groove is internally movably connected with a limit block. The insertion end of the steel pipe corresponds to the limit block, and the steel pipe is blocked by the limit block, thereby adjusting the insertion length of the steel pipe and controlling the shrinkage length of the steel pipe.

[0013] As another improved supplement of the present application, a pneumatic push rod is fixedly connected to the inside of the die head, and the output end of the pneumatic push rod is fixedly connected to the limit block. The position of the limit block is changed by the pneumatic push rod, so as to facilitate the adjustment of the limit length of the steel pipe.

[0014] As another improvement of the present application, the top and bottom ends of the limit block are both connected with extension heads, and an extension spring is fixedly connected between the two extension heads. The extension spring is used to push the extension head out of the limit block, thereby extending the length of the limit block to adapt to steel pipes of different calibers.

[0015] As another improvement supplement of the present application, the outer end of the protruding head is arranged in an arc shape, and the protruding end of the protruding head is in active contact with the cold rolling die. The arc-shaped protruding head is convenient for contacting the inner wall of the cold rolling die and rotating on the inner wall of the cold rolling die, effectively avoiding affecting the rotation of the steel pipe.

[0016] As another improvement supplement of the present application, a magnetic adsorption block is embedded inside the extension head, and the magnetic adsorption block corresponds to the adsorption of the steel pipe. The steel pipe is adsorbed by the magnetic adsorption block to achieve close contact with the extension head, effectively avoiding the shrinkage length of the steel pipe not meeting the standard due to exiting the cold rolling die.

[0017] In summary, the present invention inserts the steel pipe between the cold rolling die and the fixed ring die, tightens the screw to shrink the distance between the rotating support head and the fixed support head, and pushes the inner support block outward to support the inner wall of the steel pipe, thereby realizing the transmission connection between the rotating shaft tube and the steel pipe, and the rotating shaft tube corresponds to the axis of the steel pipe, so that the steel pipe is in the center of the cold rolling die, effectively improving the uniform cold rolling effect of the cold rolling die on the steel pipe, and after the cold rolling shrinking process of the steel pipe, the screw rotates in the opposite direction to realize the inner support block to shrink away from the inner wall of the steel pipe, so that the steel pipe after the cold rolling shrinking is pulled out of the die, and the steel pipe to be processed is quickly replaced, which effectively improves the cold rolling efficiency and cold rolling processing quality of the steel pipe;

[0018] Then the cold rolling die shrinks and extrude the steel pipe, and performs shrinking cold rolling on the steel pipe. After each cold rolling and shrinking of the steel pipe, the rotating shaft tube rotates to drive the steel pipe to rotate and adjust the specified angle, which facilitates uniform shrinking of the steel pipe and effectively improves the cold rolling shrinking quality of the steel pipe. The rotation of the rotating shaft tube facilitates the electronic control operation of the equipment, realizing the fully automated shrinking cold rolling processing upgrade of the steel pipe, thereby effectively improving the cold rolling processing efficiency of the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the present application;

[0020] Figure 2 This is a three-dimensional structural diagram of a cold rolling die in the first embodiment of the present application;

[0021] Figure 3 This is a three-dimensional structural diagram of the die head, cold rolling die and fixed ring die of the first embodiment of the present application;

[0022] Figure 4 A side cross-sectional view of a cold rolling die according to a first embodiment of the present application;

[0023] Figure 5 This is a side cross-sectional view of the inner support block of the first embodiment of the present application;

[0024] Figure 6 This is a demonstration diagram of the inner support block supporting the inner wall of the steel pipe in the first embodiment of the present application;

[0025] Figure 7 This is an enlarged view of the position of the driving gear and the U-shaped groove in the first embodiment of the present application;

[0026] Figure 8 This is a three-dimensional structural diagram of a rotating shaft tube according to a second embodiment of the present application;

[0027] Fig. 9 This is a side perspective structural diagram of the movable groove of the second embodiment of the present application;

[0028] Fig.10 This is a cross-sectional view of the extension head according to the second embodiment of the present application.

[0029] Description of the numbers in the figure:

[0030] 1. Hydraulic machine body; 101. Die head; 2. Cold rolling die; 201. Press module; 3. Fixed ring die; 4. Steel pipe; 5. Rotating shaft tube; 501. Fixed support head; 502. Screw; 503. Rotating support head; 504. Support ring; 505. Inner support block; 6. Driving gear; 601. U-shaped groove; 602. Push-pull cylinder; 603. Push-pull pressure plate; 604. Horizontal rail; 7. Movable groove; 701. Limit block; 702. Pneumatic push rod; 703. Extending head; 704. Extending spring; 705. Magnet adsorption block. DETAILED DESCRIPTION

[0031] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1-3It is shown that a cold rolling device for seamless steel pipe production includes a hydraulic body 1, the output end of the hydraulic body 1 is fixedly connected with a die head 101, the outside of the die head 101 is plugged with a cold rolling die 2, the top end of the hydraulic body 1 close to the die head 101 is fixedly connected with a fixed ring die 3, the cold rolling die 2 is sleeved with the fixed ring die 3, and a steel pipe 4 is plugged between the cold rolling die 2 and the fixed ring die 3, the cold rolling die 2 is arranged in a truncated cone shape, and the cold rolling die 2 is composed of a ring-distributed pressing module 201, the outer inclined surface of the pressing module 201 is in active contact with the inner ring surface of the fixed ring die 3, when the cold rolling die 2 is pressed toward the fixed ring die 3, the inclined surface of the pressing module 201 is squeezed by the inner ring of the fixed ring die 3, so that the pressing module 201 can evenly gather and extrude the steel pipe 4, and effectively improve the cold rolling shrinkage quality of the steel pipe 4;

[0034] The steel pipe 4 is inserted between the cold rolling die 2 and the fixed ring die 3, and then the die head 101 of the hydraulic body 1 pushes the cold rolling die 2 to move toward the fixed ring die 3. The inclined surface of the pressing module 201 is squeezed by the inner ring of the fixed ring die 3, and the annularly distributed pressing module 201 evenly contracts and squeezes the steel pipe 4, thereby realizing the cold rolling shrinkage of the steel pipe 4 and effectively improving the shrinkage quality of the steel pipe 4.

[0035] Figure 4-6 As shown, a rotating shaft tube 5 is inserted in the middle of the cold rolling die 2, and the end of the rotating shaft tube 5 away from the die head 101 is fixedly connected to a fixed support head 501, and the fixed support head 501 extends out of the cold rolling die 2, and the end of the rotating shaft tube 5 close to the fixed support head 501 is internally threadedly connected to a screw rod 502, and the end of the screw rod 502 extending out of the fixed support head 501 is fixedly connected to a rotating support head 503, and the end of the rotating support head 503 close to the fixed support head 501 is rotatably connected to a support ring 504, and an inner support block 505 is hinged between the support ring 504 and the fixed support head 501, and the inner support block 505 is in close contact with the inner wall of the steel pipe 4;

[0036] After the steel tube 4 is inserted between the cold rolling die 2 and the fixed ring die 3, the distance between the rotating support head 503 and the fixed support head 501 is contracted by tightening the screw 502, and the hinged inner support block 505 is pushed out, so that the inner support block 505 supports the inner wall of the steel tube 4, and the rotating shaft tube 5 is on the central axis of the steel tube 4, so that the steel tube 4 is evenly stressed during cold rolling, and the rotating shaft tube 5 and the steel tube 4 are connected in transmission. After the cold rolling die 2 cold rolls the steel tube 4 once, the rotating shaft tube 5 drives the steel tube 4 to rotate. Turn a certain angle, the specific rotation angle can be selected as 20° to 30°, the automatic rotation adjustment cold rolling of the steel pipe 4 is convenient for the fully automated shrinking cold rolling processing upgrade of the steel pipe, without the need for manual hand-held processing, and effectively improves the cold rolling processing efficiency of the steel pipe 4. After the cold rolling shrinkage of the steel pipe 4 is completed, the screw 502 rotates in the opposite direction, so that the inner support block 505 retracts away from the inner wall of the steel pipe 4, and finally the steel pipe 4 is pulled out of the cold rolling die 2, and the new steel pipe 4 to be cold rolled is quickly replaced, thereby effectively improving the cold rolling processing efficiency of the steel pipe.

[0037] Figure 3 and 7 As shown, the end of the rotating shaft tube 5 close to the die head 101 is fixedly connected with the driving gear 6, and the top of the die head 101 is provided with a U-shaped groove 601, and the U-shaped groove 601 is engaged with the driving gear 6. By placing the driving gear 6 into the U-shaped groove 601, the cold rolling die 2 is quickly installed on the die head 101, thereby improving the installation and replacement efficiency of the cold rolling die 2. The top of the die head 101 is fixedly connected with a push-pull cylinder 602, and the output end of the push-pull cylinder 602 is hinged with a push-pull pressure plate 603, which is set on the top of the U-shaped groove 601, and the push-pull pressure plate 603 is set on the top of the U-shaped groove 601. The bottom of 03 is meshed with the driving gear 6, and the push-pull pressing plate 603 is used to close the top of the U-shaped groove 601 to prevent the driving gear 6 from being separated from the U-shaped groove 601. At the same time, the push-pull pressing plate 603 is used to mesh and drive the driving gear 6 to realize the repeated rotation of the rotating shaft tube 5. The cylinder end of the push-pull cylinder 602 is fixedly connected with a horizontal rail 604, and the top of the push-pull pressing plate 603 is movably connected with the horizontal rail 604. The push-pull cylinder 602 is telescopically driven to drive the push-pull pressing plate 603 to move, so that the push-pull pressing plate 603 is meshed and drives the driving gear 6 to realize the repeated rotation of the rotating shaft sleeve 5.

[0038] When replacing and installing the cold rolling die 2, the driving gear 6 is placed in the U-shaped groove 601 to achieve the docking connection between the cold rolling die 2 and the die head 101, which is convenient for the rapid installation of the cold rolling die 2. Then the push-pull plate 603 is rotated to cover the top of the closed U-shaped groove 601, and the push-pull cylinder 602 contracts to drive the push-pull plate 603 to slide and engage with the push-pull plate 603. The push-pull plate 603 blocks the driving gear 6 to prevent the driving gear 6 from escaping from the U-shaped groove 601. During the cold rolling processing of the steel pipe 4, the push-pull cylinder 602 repeatedly drives the push-pull plate 603 back and forth, and drives the driving gear 6 through the meshing of the push-pull plate 603 to achieve repeated rotation of the rotating shaft tube 5, which is convenient for the uniform cold rolling processing of the steel pipe 4.

[0039] The second implementation method:

[0040] Compared with the first embodiment, this embodiment mainly adds a limit block 701, and the specific newly added structure is as follows, and the remaining structures are consistent with the first embodiment.

[0041] Figure 8-9 As shown, a movable groove 7 is opened in the middle of the rotating shaft tube 5, and a limit block 701 is movably connected inside the movable groove 7. The insertion end of the steel pipe 4 corresponds to the limit block 701. The limit block 701 blocks the steel pipe 4, thereby adjusting the insertion length of the steel pipe 4 and controlling the shrinkage length of the steel pipe 4. A pneumatic push rod 702 is fixedly connected inside the die head 101, and the output end of the pneumatic push rod 702 is fixedly connected to the limit block 701. The position of the limit block 701 is changed by the pneumatic push rod 702, so as to facilitate the adjustment of the limit length of the steel pipe 4.

[0042] After the steel pipe 4 is inserted between the cold rolling die 2 and the fixed ring die 3, the inserted end of the steel pipe 4 abuts against the limit block 701, thereby limiting the insertion length of the steel pipe 4, which is convenient for processing the shrinkage of the steel pipe 4 of a specified length. The position of the limit block 701 is changed by the pneumatic push rod 702, and the pneumatic push rod 702 facilitates the precise electronic control operation of the processing equipment, thereby accurately adjusting the blocking position of the limit block 701, effectively improving the accuracy of the shrinkage processing.

[0043] Figure 9-10 As shown, the top and bottom ends of the limit block 701 are both plugged with a protruding head 703, and an extension spring 704 is fixedly connected between the two protruding heads 703. The extension spring 704 is used to push the protruding head 703 out of the limit block 701, thereby extending the length of the limit block 701 to adapt to steel pipes 4 of different calibers. The outer end of the protruding head 703 is arranged in an arc shape, and the protruding end of the protruding head 703 is in active contact with the cold rolling die 2. The arc-shaped protruding head 703 is convenient for contacting the inner wall of the cold rolling die 2 and rotating on the inner wall of the cold rolling die 2, effectively avoiding affecting the rotation of the steel pipe 4. The interior of the protruding head 703 is inlaid with a magnet adsorption block 705, and the magnet adsorption block 705 corresponds to the adsorption of the steel pipe 4. The magnet adsorption block 705 is used to adsorb the steel pipe 4, so that the steel pipe 4 is closely contacted with the protruding head 703, effectively avoiding the steel pipe 4 from exiting the cold rolling die 2, resulting in the shrinkage length not meeting the standard;

[0044] The extension spring 704 is used to push the extension head 703 out of the limit block 701, and the length of the limit block 701 is extended to meet the blocking requirements of steel pipes 4 of different calibers. At the same time, when the cold rolling die 2 is contracted and extruded, the extension head 703 is pressed back to the limit block 701. The arc-shaped setting of the outer end of the extension head 703 facilitates the limit block 701 to flexibly contact the cold rolling die 2, thereby effectively improving the flexibility of the limit block 701. The magnet adsorption block 705 is used to adsorb the steel pipe 4, so that the steel pipe 4 is in close contact with the extension head 703 and prevents the steel pipe 4 from escaping from the limit block 701, thereby further effectively improving the accuracy of the cold rolling shrinkage processing of the steel pipe 4.

[0045] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A cold rolling device for producing seamless steel pipes, characterized in that: It comprises a hydraulic machine body (1), the output end of the hydraulic machine body (1) is fixedly connected to a die head (101), the outside of the die head (101) is plugged with a cold rolling die (2), the top end of the hydraulic machine body (1) close to the die head (101) is fixedly connected to a fixed ring die (3), the cold rolling die (2) and the fixed ring die (3) are sleeved, and a steel pipe (4) is plugged between the cold rolling die (2) and the fixed ring die (3); A rotating shaft tube (5) is inserted into the middle of the cold rolling die (2); one end of the rotating shaft tube (5) away from the die head (101) is fixedly connected to a fixed support head (501); the fixed support head (501) extends out of the cold rolling die (2); one end of the rotating shaft tube (5) close to the fixed support head (501) is internally threadedly connected to a screw rod (502); one end of the screw rod (502) extending out of the fixed support head (501) is fixedly connected to a rotating support head (503); one end of the rotating support head (503) close to the fixed support head (501) is rotatably connected to a support ring (504); an inner support block (505) is hinged between the support ring (504) and the fixed support head (501); the inner support block (505) is in close contact with the inner wall of the steel pipe (4).

2. A cold rolling device for producing seamless steel pipes according to claim 1, characterized in that: The cold rolling die (2) is arranged in a truncated cone shape, and is composed of annularly distributed pressing modules (201), wherein the outer inclined surface of the pressing module (201) is in active contact with the inner ring surface of the fixed ring die (3).

3. A cold rolling device for producing seamless steel pipes according to claim 1, characterized in that: One end of the rotating shaft tube (5) close to the die head (101) is fixedly connected to a driving gear (6); a U-shaped groove (601) is provided on the top of the die head (101); and the U-shaped groove (601) is engaged with the driving gear (6).

4. A cold rolling device for producing seamless steel pipes according to claim 3, characterized in that: The top of the die head (101) is fixedly connected to a push-pull cylinder (602), the output end of the push-pull cylinder (602) is hingedly connected to a push-pull pressing plate (603), the push-pull pressing plate (603) is mounted on the top of the U-shaped groove (601), and the bottom of the push-pull pressing plate (603) is meshed with the driving gear (6).

5. A cold rolling device for producing seamless steel pipes according to claim 4, characterized in that: The cylinder end of the push-pull cylinder (602) is fixedly connected to a horizontal rail (604), and the top of the push-pull pressure plate (603) is movably connected to the horizontal rail (604).

6. A cold rolling device for producing seamless steel pipes according to claim 1, characterized in that: A movable groove (7) is provided in the middle of the rotating shaft tube (5), the interior of the movable groove (7) is movably connected to a limit block (701), and the insertion end of the steel tube (4) corresponds to the limit block (701).

7. A cold rolling device for producing seamless steel pipes according to claim 6, characterized in that: A pneumatic push rod (702) is fixedly connected inside the die head (101), and an output end of the pneumatic push rod (702) is fixedly connected to a limit block (701).

8. A cold rolling device for producing seamless steel pipes according to claim 6, characterized in that: The top and bottom ends of the limit block (701) are both plugged with extension heads (703), and an extension spring (704) is fixedly connected between the two extension heads (703).

9. A cold rolling device for producing seamless steel pipes according to claim 8, characterized in that: The outer end of the extension head (703) is arranged in an arc shape, and the extension end of the extension head (703) is in active contact with the cold rolling die (2).

10. A cold rolling device for producing seamless steel pipes according to claim 8, characterized in that: A magnetic adsorption block (705) is embedded inside the extension head (703), and the magnetic adsorption block (705) adsorbs and corresponds to the steel pipe (4).

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