A mandrel clamped small diameter steel pipe cold rolling mill

Abstract

The present application relates to the technical fields of steel pipe cold rolling mill, in particular to a small-diameter steel pipe cold rolling mill with core rod clamping, which comprises a cold rolling mill body and a base installed on the cold rolling mill body, a supporting shell is installed on the base, a supporting plate is fixedly installed on one side of the supporting shell close to the cold rolling mill body, a through hole is arranged at the center of the supporting plate, a rotating rod penetrates through the through hole, and the rotating rod is rotationally connected to the supporting shell; a driving mechanism for driving the rotating rod is installed on the supporting shell; the small-diameter steel pipe cold rolling mill with core rod clamping can not only stably clamp the core rod, but also comprehensively detect the straightness of the core rod before rolling the next small-diameter steel pipe, thereby ensuring the stable rolling of the subsequent small-diameter steel pipe and the rolling production efficiency of the small-diameter steel pipe.

Description

Technical Field

[0001] This invention relates to the field of cold rolling mill technology for steel pipes, specifically a cold rolling mill for small-diameter steel pipes with mandrel clamping. Background Technology

[0002] On the production line of cold-rolled stainless steel tubes, mandrels are installed in the rolling mill and work together with the rolls to support the steel tube. As the steel tube passes through the rolling mill, the mandrels provide support from inside the tube, ensuring that it maintains a stable shape and dimensions during the rolling process. In the two-roll cold rolling process, the steel tube is repeatedly rolled within the gap between the mandrel and the die, achieving a reduction in the outer diameter and wall thickness of the steel tube. During the rolling process, the mandrel is subjected to an axial force, which helps to achieve uniform deformation and diameter and wall thickness reduction of the tube blank during the rolling process.

[0003] The mandrel clamping in a cold rolling mill for steel pipes primarily relies on a mechanical three-jaw chuck mounted on the end of a hollow gear shaft. Each time a tube blank is loaded, the mechanical three-jaw chuck is manually operated to clamp the mandrel. During mill operation, the motor transmits power to the hollow gear shaft via a gearbox, causing the mechanical three-jaw chuck to rotate. The mandrel also rotates, ensuring a certain angle of rotation during tube rolling, thus guaranteeing that the rolled tube has a smooth surface without wrinkles and a uniform wall thickness.

[0004] When rolling small-diameter steel pipes, the length requirement of the mandrel is usually determined according to the specific production needs and steel pipe specifications. The standard mandrel length is generally 6m to 12m. However, when rolling small-diameter steel pipes, a mandrel with a corresponding small diameter is required.

[0005] However, even small-diameter mandrels are subject to significant axial tensile forces. These forces can cause axial or radial deformation, which may affect the dimensional accuracy and surface quality of the rolled steel pipe. Particularly when the axial pressure is high, the mandrel may bend longitudinally, leading to a decrease in the straightness of the steel pipe. Existing mandrels only serve a clamping function and cannot promptly detect the straightness of the mandrel, thus impacting the production of small-diameter steel pipes. Therefore, we propose a cold rolling mill for small-diameter steel pipes that uses a mandrel clamping mechanism. Summary of the Invention

[0006] The purpose of this invention is to provide a cold rolling mill for small-diameter steel pipes with mandrel clamping, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a cold rolling mill for small-diameter steel pipes with mandrel clamping, comprising a cold rolling mill body and a base installed on the cold rolling mill body, a support shell installed on the base, a support plate fixedly installed on the side of the support shell near the cold rolling mill body, a through hole provided at the center of the support plate, and a rotating rod passing through the through hole, the rotating rod being rotatably connected to the support shell;

[0008] The support shell is equipped with a drive mechanism for driving the rotating rod.

[0009] A clamping linkage mechanism is installed at one end of the rotating rod located outside the through hole, and a synchronization mechanism for driving the clamping linkage mechanism is provided at the support shell.

[0010] The clamping linkage mechanism is connected to multiple clamping blocks, and the multiple clamping blocks are used to clamp the core rod together.

[0011] The clamping blocks are provided with positioning detection mechanisms between each other, and the positioning detection mechanisms detect the straightness of the core rod.

[0012] The driving mechanism includes a drive motor, a first drive gear, and a second drive gear. The drive motor is fixedly installed on the outside of the support shell. The output end of the drive motor is located inside the support shell and is fixedly connected to the first drive gear. The output end of the drive motor is rotatably connected to the support shell. The first drive gear is meshed with the second drive gear, and the second drive gear is fixedly sleeved on the outside of the rotating rod.

[0013] The clamping linkage mechanism includes a guide shell, a first moving block, a second moving block, a fixed sleeve, and a connector. The guide shell is rotatably connected to the outside of the support shell. The guide shell is provided with four moving ports. There are two first moving blocks and two second moving blocks. The two first moving blocks and the two second moving blocks slide through the moving ports respectively, and the first moving blocks and the second moving blocks are distributed on the guide shell at a perpendicular angle.

[0014] The first and second movable blocks are rotatably connected to a connecting rod at one end inside the guide shell via a pin. The four connecting rods are rotatably connected to a synchronizing plate at one end close to each other via a pin. The synchronizing plate is rotatably sleeved on the outside of the fixed sleeve. The two ends of the fixed sleeve are fixedly connected to the guide shell and the rotating rod, respectively.

[0015] The two first movable blocks and the second movable block are fixedly connected to the clamping block on the side outside the movable opening;

[0016] The connector is located inside the guide shell and is connected to two first moving blocks. The first moving blocks are driven by a synchronization mechanism. Through the provided clamping linkage mechanism, the function of synchronously driving multiple clamping blocks is realized.

[0017] The connecting component includes a fixed plate, a slide rod, and a bidirectional threaded rod. There are two fixed plates, both of which are fixedly installed inside the guide shell. The two ends of the slide rod are respectively fixedly connected to the two fixed plates. The bidirectional threaded rod is rotatably connected between the two fixed plates and is connected to a synchronization mechanism.

[0018] The two first moving blocks are slidably sleeved on the outside of the slide rod, and the two first moving blocks are respectively threaded on both ends of the bidirectional threaded rod. Through the provided connecting parts, the two first moving blocks are driven.

[0019] The synchronization mechanism includes a movable sleeve, a first rotating gear, a second rotating gear, and a rotating component. The movable sleeve is slidably sleeved on the outside of the rotating rod. The first rotating gear is located inside the guide shell, and the second rotating gear is located inside the support shell. The movable sleeve is provided with multiple annular toothed grooves at equal intervals. The first rotating gear and the second rotating gear are respectively meshed with the annular toothed grooves.

[0020] The first rotating gear is fixedly sleeved on the outside of the bidirectional threaded rod, and the rotating component is used to drive the second rotating gear. Through the provided synchronization mechanism, the clamping linkage mechanism is synchronously driven.

[0021] The rotating component includes a rotating motor, a worm, a worm wheel, a rotating rod, and a connecting plate. The rotating motor is located outside the support shell, and its output end passes through one side of the support shell and is fixedly connected to the worm. The output end of the rotating motor is rotatably connected to the support shell, and the worm is rotatably connected to the worm wheel.

[0022] One end of the rotating rod is fixedly connected to the worm gear, and the second rotating gear is fixedly sleeved on the outside of the rotating rod. The connecting plate is installed inside the support shell, and one end of the rotating rod is rotatably connected to the connecting plate. Through the provided rotating component, the bidirectional threaded rod is driven.

[0023] The clamping block has an inner edge and an outer edge at the end away from the support shell, and a moving groove is formed between the inner edge and the outer edge. The positioning detection mechanism is located between multiple moving grooves. The moving grooves facilitate the connection of the positioning detection mechanism to the moving grooves.

[0024] The positioning and detection mechanism includes an arc plate, a positioning block, a laser sensor, a buzzer, and a guide. There are two arc plates, which slide through four moving slots. The positioning block is fixedly installed on the inner side of the arc plate, and the core rod has a positioning slot corresponding to the position of the two positioning blocks.

[0025] The clamping block has a groove on its inner edge, and the laser sensor is installed inside the groove. The positioning block is made of transparent material.

[0026] The buzzer is mounted on the support shell, and multiple positioning ports are provided on the outer edge. Multiple guide members are provided, and the guide members are evenly distributed in the moving groove and pass through the positioning ports. Through the provided positioning detection mechanism, the straightness of the core rod is detected.

[0027] The guide component includes a guide frame, a guide block, and a connecting spring. The guide frame is U-shaped, and both ends of the guide frame slide through the two positioning ports. The guide frame is provided with two limiting protrusions at one end outside the positioning port.

[0028] The guide block is located in the positioning groove and is fixedly connected to the guide frame. The guide block is slidably connected to the arc plate. The two ends of the connecting spring are fixedly connected to the guide frame and the outer edge, respectively. Through the provided guide, the arc plate is guided.

[0029] The guide block is semi-circular in shape, and a T-shaped guide post is installed on the side of the guide block away from the clamping block. The arc plate is provided with a limiting groove corresponding to the position of the guide post, so as to facilitate the connection between the guide block and the arc plate.

[0030] The present invention has at least the following beneficial effects:

[0031] 1. When the present invention is used, the supporting shell, rotating rod, linkage clamping mechanism, driving mechanism and multiple clamping blocks not only provide stable clamping for one end of the small diameter mandrel, but also drive the small diameter steel pipe to rotate synchronously when the small diameter mandrel supports the small diameter steel pipe and during the rolling process of the small diameter steel pipe, so as to make the small diameter steel pipe roll stably.

[0032] 2. The present invention, by providing a positioning and detection mechanism on one side of multiple clamping blocks, not only enables stable clamping of the mandrel, but also enables comprehensive detection of the straightness of the mandrel before the next small-diameter steel pipe is rolled, thereby ensuring stable rolling of subsequent small-diameter steel pipes and ensuring the rolling production efficiency of small-diameter steel pipes. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a side view of the supporting shell structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the internal structure of the support shell of the present invention;

[0036] Figure 4 This is a schematic diagram of the synchronization mechanism structure of the present invention;

[0037] Figure 5 This is a schematic diagram of the worm gear structure of the present invention;

[0038] Figure 6 This is a side sectional view of the movable sleeve structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the first movable block structure of the present invention;

[0040] Figure 8 This is a schematic diagram of the connecting support structure of the present invention;

[0041] Figure 9 This is a schematic diagram of the clamping block structure of the present invention;

[0042] Figure 10 This is a schematic diagram of the arc-shaped plate structure of the present invention;

[0043] Figure 11 For the present invention Figure 10 Enlarged structural diagram of region A in the middle;

[0044] Figure 12 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0045] In the diagram: 1. Cold rolling mill body; 2. Base; 3. Support shell; 31. Support plate; 311. Through hole; 4. Rotating rod; 5. Drive mechanism; 51. Drive motor; 52. First drive gear; 53. Second drive gear; 6. Clamping linkage mechanism; 61. Guide shell; 611. Moving port; 62. First moving block; 63. Second moving block; 64. Fixed sleeve; 65. Connecting piece; 651. Fixed plate; 652. Slide rod; 653. Bidirectional threaded rod; 66. Connecting support rod; 67. Synchronizing plate; 7. Synchronizing mechanism; 71. Moving sleeve; 711. Annular toothed groove; 72. First rotating gear; 73. Second rotating gear. 74. Rotating gear; 741. Rotating motor; 742. Worm; 743. Worm wheel; 744. Rotating rod; 745. Connecting plate; 8. Clamping block; 81. Inner edge; 82. Outer edge; 83. Moving groove; 84. Connecting groove; 85. Pressure sensor; 86. Contact plate; 87. Buffer spring; 88. Clamping block; 9. Positioning detection mechanism; 91. Arc plate; 911. Limiting groove; 92. Positioning block; 93. Laser sensor; 94. Buzzer; 95. Guide component; 951. Guide frame; 952. Guide block; 9521. Guide post; 953. Connecting spring; 10. Core rod; 101. Positioning groove. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Example 1

[0048] Please see Figure 1 A cold rolling mill for small-diameter steel pipes with mandrel clamping includes a cold rolling mill body 1 and a base 2 installed on the cold rolling mill body 1. A support shell 3 is installed on the base 2. A support plate 31 is fixedly installed on the side of the support shell 3 near the cold rolling mill body 1. A through hole 311 is provided at the center of the support plate 31, and a rotating rod 4 passes through the through hole 311. The rotating rod 4 is rotatably connected to the support shell 3.

[0049] Please see Figures 2 to 5 A drive mechanism 5 for driving the rotating rod 4 is installed on the support shell 3. The drive mechanism 5 includes a drive motor 51, a first drive gear 52 and a second drive gear 53. The drive motor 51 is fixedly installed on the outside of the support shell 3. The output end of the drive motor 51 is located inside the support shell 3 and is fixedly connected to the first drive gear 52. The output end of the drive motor 51 is rotatably connected to the support shell 3. The first drive gear 52 is meshed with the second drive gear 53, and the second drive gear 53 is fixedly sleeved on the outside of the rotating rod 4.

[0050] Specifically: When the rotating rod 4 is driven, the drive motor 51 runs, which in turn causes the first drive gear 52 to drive the second drive gear 53 to rotate, and further causes the rotating rod 4 to rotate relative to the support shell 3.

[0051] A clamping linkage mechanism 6 is installed at one end of the rotating rod 4 located outside the through hole 311, and a synchronization mechanism 7 for driving the clamping linkage mechanism 6 is provided at the support shell 3.

[0052] Multiple clamping blocks 8 are connected to the clamping linkage mechanism 6, and the multiple clamping blocks 8 are used to clamp the core rod 10 together. In this invention, multiple anti-slip grooves are provided on the inner side of the clamping blocks 8, so as to facilitate the multiple clamping blocks 8 to clamp the core rod 10 together stably.

[0053] Please see Figures 4 to 8The clamping linkage mechanism 6 includes a guide shell 61, a first moving block 62, a second moving block 63, a fixed sleeve 64, and a connector 65. The guide shell 61 is rotatably connected to the outside of the support shell 3. The guide shell 61 is provided with four moving ports 611. There are two first moving blocks 62 and two second moving blocks 63. The two first moving blocks 62 and the two second moving blocks 63 slide through the moving ports 611 respectively, and the first moving blocks 62 and the second moving blocks 63 are distributed on the guide shell 61 at a perpendicular angle.

[0054] The first moving block 62 and the second moving block 63 are both rotatably connected to a connecting rod 66 by a pin at one end inside the guide shell 61. The four connecting rods 66 are rotatably connected to a synchronization plate 67 by a pin at one end close to each other. The synchronization plate 67 is rotatably sleeved on the outside of the fixed sleeve 64. The two ends of the fixed sleeve 64 are fixedly connected to the guide shell 61 and the rotating rod 4, respectively. In this embodiment, the connecting rod 66 is L-shaped, which facilitates the connection of one end of the connecting rod 66 to the synchronization plate 67, and the other end of the connecting rod 66 is connected to the first moving block 62 or the second moving block 63.

[0055] The two first moving blocks 62 and the second moving block 63 are fixedly connected to the clamping block 8 on the side outside the moving port 611;

[0056] The connector 65 is located inside the guide shell 61. The connector 65 is connected to two first moving blocks 62, and the first moving blocks 62 are driven by the synchronization mechanism 7.

[0057] The connector 65 includes a fixed plate 651, a slide rod 652, and a bidirectional threaded rod 653. There are two fixed plates 651, and both fixed plates 651 are fixedly installed inside the guide shell 61. The two ends of the slide rod 652 are fixedly connected to the two fixed plates 651 respectively. The bidirectional threaded rod 653 is rotatably connected between the two fixed plates 651 and is connected to the synchronization mechanism 7.

[0058] Two first moving blocks 62 are slidably sleeved on the outside of the slide rod 652, and the two first moving blocks 62 are respectively threaded on both ends of the bidirectional threaded rod 653;

[0059] The synchronization mechanism 7 includes a movable sleeve 71, a first rotating gear 72, a second rotating gear 73, and a rotating component 74. The movable sleeve 71 is slidably sleeved on the outside of the rotating rod 4. The first rotating gear 72 is located inside the guide shell 61, and the second rotating gear 73 is located inside the support shell 3. The movable sleeve 71 is provided with a plurality of annular toothed grooves 711 at equal intervals. The first rotating gear 72 and the second rotating gear 73 are respectively meshed with the annular toothed grooves 711.

[0060] The first rotating gear 72 is fixedly sleeved on the outside of the bidirectional threaded rod 653, and the rotating part 74 is used to drive the second rotating gear 73;

[0061] The rotating component 74 includes a rotating motor 741, a worm 742, a worm wheel 743, a rotating rod 744, and a connecting plate 745. The rotating motor 741 is located outside the support shell 3, and the output end of the rotating motor 741 passes through one side of the support shell 3 and is fixedly connected to the worm 742. The output end of the rotating motor 741 is rotatably connected to the support shell 3, and the worm 742 is rotatably connected to the worm wheel 743.

[0062] One end of the rotating rod 744 is fixedly connected to the worm gear 743, and the second rotating gear 73 is fixedly sleeved on the outside of the rotating rod 744. The connecting plate 745 is installed inside the support shell 3, and one end of the rotating rod 744 is rotatably connected to the connecting plate 745.

[0063] Specific implementation process: When one end of the small-diameter core rod 10 is clamped, the one end of the core rod 10 abuts against the guide shell 61. Then, by rotating the motor 741, the worm 742 drives the worm wheel 743 to rotate. When the worm wheel 743 rotates, the rotating rod 744 drives the second rotating gear 73 to rotate. Since the second rotating gear 73 meshes with the annular tooth groove 711, the second rotating gear 73 rotates while pushing the moving sleeve 71 along the guide shell 61 through the annular tooth groove 711. When the moving sleeve 71 moves, it further pushes the first rotating gear 72 to rotate relative to the guide shell 61 through the multiple annular tooth grooves 711.

[0064] When the first rotating gear 72 rotates, the bidirectional threaded rod 653 rotates relative to the two fixed plates 651. When the bidirectional threaded rod 653 rotates, it provides driving force in opposite directions to the two first moving blocks 62. At this time, under the limiting action of the slide rod 652, the two first moving blocks 62 move in opposite directions. And as the first moving blocks 62 move, under the connecting action of the connecting support rods 66, the multiple connecting support rods 66 drive the synchronous plate 67 to rotate relative to the fixed sleeve 64. Furthermore, when the four connecting support rods 66 rotate, under the limiting action of the four moving ports 611 on the guide shell 61, the two first moving blocks 62 and the two second moving blocks 63 move towards each other until the clamping blocks 8 at the two first moving blocks 62 and the two second moving blocks 63 clamp and fix the core rod 10 to each other.

[0065] Furthermore, during the rolling process of the small-diameter steel pipe, the rotating motor is used to rotate the rotating rod 4 relative to the support shell 3. When the rotating rod 4 rotates, the fixed sleeve 64 and the clamping block 8 drive the core rod 10 to rotate synchronously. At the same time, the first rotating gear 72 rotates around the gear groove at the moving sleeve 71, thereby enabling the core rod 10 to cooperate with the cold rolling mill to achieve the effect of stable rolling of the small-diameter steel pipe.

[0066] Please see Figures 9 to 11 Multiple clamping blocks 8 are provided with positioning detection mechanisms 9 between each other. The positioning detection mechanisms 9 detect the straightness of the core rod 10. The end of the clamping block 8 away from the support shell 3 is provided with an inner edge 81 and an outer edge 82 respectively. A moving groove 83 is formed between the inner edge 81 and the outer edge 82. The positioning detection mechanism 9 is located between multiple moving grooves 83.

[0067] The positioning detection mechanism 9 includes an arc plate 91, a positioning block 92, a laser sensor 93, a buzzer 94, and a guide 95. There are two arc plates 91, which slide through the four moving slots 83. The positioning block 92 is fixedly installed on the inner side of the arc plate 91, and the core rod 10 is provided with a positioning slot 101 corresponding to the position of the two positioning blocks 92.

[0068] The clamping block 8 has a groove at its inner edge 81, and the laser sensor 93 is installed inside the groove. The positioning block 92 is made of transparent material.

[0069] The buzzer 94 is mounted on the support shell 3. Multiple positioning ports are provided at the outer edge 82. Multiple guides 95 are provided. The guides 95 are evenly distributed at the moving groove 83 and the guides 95 pass through the positioning ports.

[0070] The guide component 95 includes a guide frame 951, a guide block 952 and a connecting spring 953. The guide frame 951 is U-shaped and its two ends slide through the two positioning ports. The guide frame 951 is provided with two limiting protrusions at one end outside the positioning port.

[0071] The guide block 952 is located at the positioning groove 101, and the guide block 952 is fixedly connected to the guide frame 951. The guide block 952 is slidably connected to the arc plate 91. The two ends of the connecting spring 953 are fixedly connected to the guide frame 951 and the outer edge 82, respectively.

[0072] The guide block 952 is semi-circular in shape. A T-shaped guide post 9521 is installed on the side of the guide block 952 away from the clamping block 8. The arc plate 91 is provided with a limiting groove 911 corresponding to the guide post 9521. The semi-circular shape allows multiple guide blocks 952 to rotate relative to the arc plate 91. At the same time, both ends of the arc plate 91 are arc-shaped, which ensures that the clamping block 8 can rotate relative to the arc plate 91 through multiple guide blocks 952. The guide post 9521 and the corresponding limiting groove 911 on the arc plate 91 ensure that the arc plate 91 is always slidably connected to the multiple guide posts 9521 through the limiting groove 911. That is, the multiple guide posts 9521 further limit the arc plate 91.

[0073] Specific implementation process: When the small-diameter steel pipe on the outside of the core rod 10 is rolled and separated from the core rod 10, the rotating motor 741 rotates, and the four clamping blocks 8 are respectively offset from the core rod 10. In this state, the connecting spring 953 is in a naturally stretched state and does not compress the arc rod.

[0074] The positioning blocks 92 at the two arc plates 91 are located at the two positioning slots 101 at one end of the core rod 10. Then, the laser sensor 93 operates, and the four clamping blocks 8 rotate relative to one end of the core rod 10. While the clamping blocks 8 rotate, since the arc plates 91 are fixed relative to the core rod 10, the positioning blocks 92 at the two arc plates 91 support the core rod 10. Then, multiple laser sensors 93 rotate around the outside of the core rod 10 to detect the straightness of the core rod 10. When the core rod 10 bends, the laser sensor 93 sends a signal to the controller, which then controls the buzzer 94 to issue an early warning. Then, the staff can replace or repair the core rod 10.

[0075] When the straightness of the core rod 10 is kept within the set range, the four clamping blocks 8 move towards each other and stably clamp the core rod 10. At this time, the arc plate 91 squeezes the connecting spring 953 through the guide block 952, and the positioning block 92 at the arc plate 91 further positions the core rod 10.

[0076] Example 2

[0077] Please see Figure 12 Example 2 is a further supplement to Example 1. Specifically, the clamping block 8 has a connecting groove 84 on its inner side, a pressure sensor 85 is installed at the connecting groove 84, and a contact plate 86 is installed on one side of the pressure sensor 85. Multiple buffer springs 87 are fixedly installed on the contact plate 86, and a clamping block 88 is fixedly connected to one end of the multiple buffer springs 87. The clamping block 88 slides through the connecting groove 84.

[0078] Thus, while multiple clamping blocks 8 clamp one end of the core rod 10, the clamping block 88 on the clamping block 8 simultaneously contacts the outside of the core rod 10. As the clamping block 8 squeezes and clamps the core rod 10, the clamping block 88 moves along the connecting groove 84 until the four clamping blocks 8 completely clamp and fix the core rod 10. At this time, the clamping block 88 and the clamping block 8 are on the same arc line. At this time, the pressure sensor 85 reaches the set value, which indicates that the multiple clamping blocks 8 stably clamp the core rod 10.

[0079] When the core rod 10 is not clamped or the clamping force is too great, the buzzer 94 will sound an alarm, thus realizing the function of detecting when the core rod 10 is clamped, and preventing the core rod 10 from being clamped too tightly or too loosely.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold rolling mill for small-diameter steel pipes with mandrel clamping, comprising a cold rolling mill body (1) and a base (2) mounted on the cold rolling mill body (1), characterized in that: A support shell (3) is installed on the base (2). A support plate (31) is fixedly installed on the side of the support shell (3) near the cold rolling mill body (1). A through hole (311) is provided at the center of the support plate (31), and a rotating rod (4) passes through the through hole (311). The rotating rod (4) is rotatably connected to the support shell (3). The support shell (3) is equipped with a drive mechanism (5) for driving the rotating rod (4); The rotating rod (4) is equipped with a clamping linkage mechanism (6) at one end outside the through hole (311), and a synchronization mechanism (7) for driving the clamping linkage mechanism (6) is provided at the support shell (3). The clamping linkage mechanism (6) is connected to multiple clamping blocks (8), and the multiple clamping blocks (8) are used to clamp the core rod (10) together; The multiple clamping blocks (8) are provided with positioning detection mechanisms (9) between each other, and the positioning detection mechanisms (9) detect the straightness of the core rod (10); The clamping linkage mechanism (6) includes a guide shell (61), a first moving block (62), a second moving block (63), a fixed sleeve (64), and a connector (65). The guide shell (61) is rotatably connected to the outside of the support shell (3). The guide shell (61) is provided with four moving ports (611). The first moving block (62) and the second moving block (63) are each provided with two. The two first moving blocks (62) and the two second moving blocks (63) slide through the moving ports (611) respectively, and the first moving blocks (62) and the second moving blocks (63) are distributed on the guide shell (61) at a vertical angle. The first moving block (62) and the second moving block (63) are both rotatably connected to a connecting rod (66) by a pin at one end inside the guide shell (61). The four connecting rods (66) are rotatably connected to a synchronous plate (67) at one end close to each other by a pin. The synchronous plate (67) is rotatably sleeved on the outside of the fixed sleeve (64). The two ends of the fixed sleeve (64) are fixedly connected to the guide shell (61) and the rotating rod (4) respectively. The two first moving blocks (62) and the second moving block (63) are fixedly connected to the clamping block (8) on the side outside the moving port (611); The connector (65) is located inside the guide shell (61), and the connector (65) is connected to two first moving blocks (62), and the first moving blocks (62) are driven by a synchronization mechanism (7); The synchronization mechanism (7) includes a movable sleeve (71), a first rotating gear (72), a second rotating gear (73), and a rotating component (74). The movable sleeve (71) is slidably sleeved on the outside of the rotating rod (4). The first rotating gear (72) is located inside the guide shell (61), and the second rotating gear (73) is located inside the support shell (3). The movable sleeve (71) is provided with a plurality of annular toothed grooves (711) at equal intervals. The first rotating gear (72) and the second rotating gear (73) are respectively meshed with the annular toothed grooves (711). The first rotating gear (72) is fixedly sleeved on the outside of the bidirectional threaded rod (653), and the rotating component (74) is used to drive the second rotating gear (73).

2. The cold rolling mill for small-diameter steel pipes with mandrel clamping according to claim 1, characterized in that: The drive mechanism (5) includes a drive motor (51), a first drive gear (52) and a second drive gear (53). The drive motor (51) is fixedly installed on the outside of the support shell (3). The output end of the drive motor (51) is located inside the support shell (3) and is fixedly connected to the first drive gear (52). The output end of the drive motor (51) is rotatably connected to the support shell (3). The first drive gear (52) is meshed with the second drive gear (53), and the second drive gear (53) is fixedly sleeved on the outside of the rotating rod (4).

3. A cold rolling mill for clamping small-diameter steel pipes according to claim 1, characterized in that: The connector (65) includes a fixed plate (651), a slide rod (652), and a bidirectional threaded rod (653). There are two fixed plates (651), and both fixed plates (651) are fixedly installed inside the guide shell (61). The two ends of the slide rod (652) are fixedly connected to the two fixed plates (651) respectively. The bidirectional threaded rod (653) is rotatably connected between the two fixed plates (651) and is connected to the synchronization mechanism (7). The two first moving blocks (62) are slidably sleeved on the outside of the slide rod (652), and the two first moving blocks (62) are respectively threaded on both ends of the bidirectional threaded rod (653).

4. A cold rolling mill for clamping small-diameter steel pipes according to claim 1, characterized in that: The rotating component (74) includes a rotating motor (741), a worm (742), a worm wheel (743), a rotating rod (744), and a connecting plate (745). The rotating motor (741) is located outside the support shell (3), and the output end of the rotating motor (741) passes through one side of the support shell (3) and is fixedly connected to the worm (742). The output end of the rotating motor (741) is rotatably connected to the support shell (3), and the worm (742) is rotatably connected to the worm wheel (743). One end of the rotating rod (744) is fixedly connected to the worm gear (743), and the second rotating gear (73) is fixedly sleeved on the outside of the rotating rod (744). The connecting plate (745) is installed inside the support shell (3), and one end of the rotating rod (744) is rotatably connected to the connecting plate (745).

5. A cold rolling mill for clamping small-diameter steel pipes according to claim 1, characterized in that: The clamping block (8) has an inner edge (81) and an outer edge (82) at one end away from the support shell (3), and a moving groove (83) is formed between the inner edge (81) and the outer edge (82). The positioning detection mechanism (9) is located between multiple moving grooves (83).

6. A cold rolling mill for clamping small-diameter steel pipes according to claim 5, characterized in that: The positioning detection mechanism (9) includes an arc plate (91), a positioning block (92), a laser sensor (93), a buzzer (94), and a guide (95). There are two arc plates (91), which slide through four moving slots (83). The positioning block (92) is fixedly installed on the inner side of the arc plate (91), and the core rod (10) is provided with a positioning slot (101) corresponding to the position of the two positioning blocks (92). The clamping block (8) has a groove at its inner edge (81), and the laser sensor (93) is installed inside the groove. The positioning block (92) is made of transparent material. The buzzer (94) is mounted on the support shell (3). Multiple positioning ports are provided at the outer edge (82). Multiple guides (95) are provided. The guides (95) are evenly distributed at the moving groove (83) and the guides (95) pass through the positioning ports.

7. A cold rolling mill for clamping small-diameter steel pipes according to claim 6, characterized in that: The guide (95) includes a guide frame (951), a guide block (952) and a connecting spring (953). The guide frame (951) is U-shaped, and both ends of the guide frame (951) slide through the two positioning ports. The guide frame (951) is provided with two limiting protrusions at one end outside the positioning port. The guide block (952) is located at the positioning groove (101), and the guide block (952) is fixedly connected to the guide frame (951). The guide block (952) is slidably connected to the arc plate (91). The two ends of the connecting spring (953) are fixedly connected to the guide frame (951) and the outer edge (82) respectively.

8. A cold rolling mill for clamping small-diameter steel pipes according to claim 7, characterized in that: The guide block (952) is semi-circular in shape. A T-shaped guide post (9521) is installed on the side of the guide block (952) away from the clamping block (8). The arc plate (91) is provided with a limiting groove (911) corresponding to the position of the guide post (9521).

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