Small-diameter steel pipe cold-rolling mill clamped by core rod

Abstract

The invention relates to the technical field of steel pipe cold-rolling mills, in particular to a core rod clamping small-diameter steel pipe cold-rolling mill 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 the side, close to the cold-rolling mill body, of the supporting shell, and a through hole is formed in the center of the supporting plate. A rotating rod penetrates through the through hole and is rotationally connected to the supporting shell. The supporting shell is provided with a driving mechanism used for driving the rotating rod. According to the small-diameter steel pipe cold rolling mill capable of clamping the core rod, the positioning detection mechanism is arranged on one sides of the multiple clamping blocks, so that the core rod can be stably clamped, meanwhile, the straightness of the core rod can be comprehensively detected before a next small-diameter steel pipe is rolled, and then it is guaranteed that the follow-up small-diameter steel pipe is stably rolled; and the rolling production efficiency of the small-diameter steel pipe is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of steel tube cold rolling mills, in particular to a cold rolling mill for small-diameter steel tubes clamped by a core rod. Background Art

[0002] In the production line of cold-rolled stainless steel pipes, the core rod is installed in the rolling mill and acts on the steel pipe together with the rollers. When the steel pipe passes through the rolling mill, the core rod provides support from the inside of the steel pipe to ensure that it maintains a stable shape and size during the rolling process. In the two-roll cold rolling pipe method, the steel pipe is repeatedly rolled in the gap between the core rod and the hole type, achieving a reduction in the outer diameter of the steel pipe and a thinning of the wall thickness. During the rolling process, the core head will be subjected to an axial force, which helps the uniform deformation and diameter and wall reduction of the tube blank during the rolling process;

[0003] The core rod clamping of the steel tube cold rolling mill mainly relies on the mechanical three-jaw chuck installed at the end of the hollow gear shaft. Each time the tube blank is loaded, the mechanical three-jaw chuck will be manually operated to clamp the core rod. When the tube rolling mill is running, the motor transmits power to the hollow gear shaft through the gear box, and drives the mechanical three-jaw chuck to rotate. At this time, the core rod also rotates to ensure that there is a certain angle when rolling the tube, so as to ensure that the surface of the rolled tube is free of wrinkles, the surface is smooth and the wall thickness is uniform;

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

[0005] However, the core rod with a smaller diameter will still be subjected to a large axial tensile force, which will cause the core rod to deform axially or radially, and this deformation may affect the dimensional accuracy and surface quality of the rolled steel pipe. In particular, when the axial pressure is large, the core rod may bend longitudinally, resulting in a decrease in the straightness of the steel pipe. The existing core rod only has a clamping function and cannot detect the straightness of the core rod in time, which in turn affects the production of small-diameter steel pipes. For this reason, we propose a small-diameter steel pipe cold rolling mill with core rod clamping. Summary of the invention

[0006] The object of the present invention is to provide a cold rolling mill for small-diameter steel pipes clamped by a core rod to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cold rolling mill for small-diameter steel pipes clamped by a core rod, comprising a cold rolling mill body and a base mounted on the cold rolling mill body, a support shell is mounted on the base, a support plate is fixedly mounted on one side of the support shell close to the cold rolling mill body, a through hole is provided at the center of the support plate, and a rotating rod passes through the through hole, and the rotating rod is rotatably connected to the support shell;

[0008] A driving mechanism for driving the rotating rod is installed on the supporting shell;

[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 supporting shell;

[0010] The clamping linkage mechanism is connected with a plurality of clamping blocks, and the plurality of clamping blocks are used to clamp the core rod mutually;

[0011] A positioning detection mechanism is provided between the plurality of clamping blocks, and the positioning detection mechanism detects the straightness of the core rod.

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

[0013] The clamping linkage mechanism comprises a guide shell, a first moving block, a second moving block, a fixed sleeve and a connecting piece. The guide shell is rotatably connected to the outside of the supporting shell. The guide shell is provided with four moving openings, and the first moving block and the second moving block are each provided with two. The two first moving blocks and the two second moving blocks slide through the moving openings respectively, and the first moving block and the second moving block are distributed on the guide shell at a vertical angle.

[0014] The ends of the first moving block and the second moving block located on the inner side of the guide shell are rotatably connected to a connecting rod through a pin shaft, and the ends of the four connecting rods close to each other are rotatably connected to a synchronous plate through a pin shaft, and the synchronous plate is rotatably sleeved on the outer side of the fixed sleeve, and the two ends of the fixed sleeve are fixedly connected to the guide shell and the rotating rod respectively;

[0015] One side of the two first moving blocks and the second moving block located outside the moving opening is fixedly connected to the clamping block respectively;

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

[0017] Wherein, the connecting member comprises a fixed plate, a sliding rod and a bidirectional threaded rod, two fixed plates are provided, the two fixed plates are fixedly mounted on the inner side of the guide shell, the two ends of the sliding rod are respectively fixedly connected to the two fixed plates, the bidirectional threaded rod is rotatably connected between the two fixed plates, and the bidirectional threaded rod is connected to the synchronization mechanism;

[0018] The two first moving blocks are slidably sleeved on the outside of the sliding rod, and the two first moving blocks are respectively threadedly sleeved on both ends of the bidirectional threaded rod, and the two first moving blocks are driven by the provided connecting piece.

[0019] The synchronization mechanism comprises a moving sleeve, a first rotating gear, a second rotating gear and a rotating member, the gear sleeve is slidably sleeved on the outside of the rotating rod, the first rotating gear is located on the inside of the guide shell, and the second rotating gear is located on the inside of the supporting shell, a plurality of annular tooth grooves are provided on the moving sleeve at equal distances, and the first rotating gear and the second rotating gear are respectively meshed and connected with the annular tooth grooves;

[0020] The first rotating gear is fixedly sleeved on the outside of the bidirectional threaded rod, and the rotating member is used to drive the second rotating gear, thereby realizing the function of synchronously driving the clamping linkage mechanism through the provided synchronization mechanism.

[0021] Wherein, the rotating member includes a rotating motor, a worm, a worm wheel, a rotating rod and a connecting plate, the rotating motor is located outside the supporting shell, and the output end of the rotating motor passes through one side of the supporting shell and is fixedly connected to the worm, the output end of the rotating motor is rotatably connected to the supporting 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 supporting shell, and one end of the rotating rod is fixedly connected to the connecting plate. Through the rotating member provided, the bidirectional threaded rod is driven.

[0023] Among them, the clamping block is provided with an inner edge and an outer edge at one end away from the supporting shell, a movable groove is formed between the inner edge and the outer edge, and the positioning detection mechanism is located between the multiple movable grooves. The movable groove is provided to facilitate the connection of the positioning detection mechanism at the movable groove.

[0024] The positioning detection mechanism includes an arc plate, a positioning block, a laser sensor, a buzzer and a guide. Two arc plates are provided. The two arc plates slide through four movable grooves. The positioning block is fixedly installed on the inner side of the arc plate, and the core rod is provided with positioning grooves at positions corresponding to the two positioning blocks.

[0025] A groove is provided at the inner edge of the clamping block, and the laser sensor is installed inside the groove, and the positioning block is made of a transparent material;

[0026] The buzzer is installed on the supporting shell, a plurality of positioning openings are arranged at the outer edge, a plurality of guide members are arranged, and the guide members are evenly distributed at the moving groove, and the guide members pass through the positioning openings, and a positioning detection mechanism is arranged, so as to realize the function of detecting the straightness of the core rod.

[0027] The guide member includes a guide frame, a guide block and a connecting spring. The guide frame is U-shaped, and the two ends of the guide frame slide through the two positioning openings. The end of the guide frame located outside the positioning opening is provided with two limiting protrusions.

[0028] The guide block is located at 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 respectively fixedly connected to the guide frame and the outer edge. Through the guide member provided, the arc plate is guided.

[0029] The guide block is semicircular in shape, a T-shaped guide column is installed on the side of the guide block away from the clamping block, and a limiting groove is provided at the position of the arc plate corresponding to the guide column, 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 in use, the supporting shell, rotating rod, linkage clamping mechanism, driving mechanism and multiple clamping blocks provided not only play the role of stably clamping one end of the small-diameter core rod, but also when the small-diameter core rod supports the small-diameter steel pipe and during the rolling process of the small-diameter steel pipe, it can synchronously drive the small-diameter steel pipe to rotate, so that the small-diameter steel pipe can be stably rolled;

[0032] 2. The present invention provides a positioning detection mechanism on one side of the plurality of clamping blocks, which can not only stably clamp the core rod, but also comprehensively detect the straightness of the core rod 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0034] Figure 2 It 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 It is a structural schematic diagram of the synchronization mechanism of the present invention;

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

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

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

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

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

[0042] Fig.10 This is a schematic diagram of the structure of the curved plate of the present invention;

[0043] Fig.11 For the present invention Fig.10 A schematic diagram of the enlarged structure of the middle A area;

[0044] Fig.12 This is a structural diagram of Embodiment 2 of the present invention.

[0045] In the figure: 1, cold rolling mill body; 2, base; 3, support shell; 31, support plate; 311, through hole; 4, rotating rod; 5, driving mechanism; 51, driving motor; 52, first driving gear; 53, second driving 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, sliding rod; 653, two-way threaded rod; 66, connecting support rod; 67, synchronous plate; 7, synchronous mechanism; 71, moving sleeve; 711, annular tooth groove; 72, first rotating gear; 73, second rotating gear Rotating gear; 74, rotating member; 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, limit groove; 92, positioning block; 93, laser sensor; 94, buzzer; 95, guide member; 951, guide frame; 952, guide block; 9521, guide column; 953, connecting spring; 10, core rod; 101, positioning groove. DETAILED DESCRIPTION

[0046] 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.

[0047] Embodiment 1

[0048] See also Figure 1 A cold rolling mill for small-diameter steel pipes clamped by a core rod comprises a cold rolling mill body 1 and a base 2 mounted on the cold rolling mill body 1, a support shell 3 is mounted on the base 2, a support plate 31 is fixedly mounted on one side of the support shell 3 close to 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 penetrates the through hole 311, and the rotating rod 4 is rotatably connected to the support shell 3;

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

[0050] Specifically, when the rotating rod 4 is driven, the driving motor 51 is operated, and the first driving gear 52 further drives the second driving gear 53 to rotate, and the rotating rod 4 is further rotated relative to the supporting 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 supporting shell 3;

[0052] A plurality of clamping blocks 8 are connected to the clamping linkage mechanism 6, and the plurality of clamping blocks 8 are used to clamp the core rod 10 mutually, and in the present invention, a plurality of anti-slip grooves are provided inside the clamping blocks 8, so that the plurality of clamping blocks 8 can stably clamp the core rod 10 mutually;

[0053] See also 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 connecting piece 65. The guide shell 61 is rotatably connected to the outside of the supporting shell 3. The guide shell 61 is provided with four moving openings 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 openings 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.

[0054] One end of the first moving block 62 and the second moving block 63 located on the inner side of the guide shell 61 are both rotatably connected to a connecting rod 66 through a pin shaft, and one end of the four connecting rods 66 close to each other is rotatably connected to a synchronous plate 67 through a pin shaft, and the synchronous plate 67 is rotatably sleeved on the outer side of the fixed sleeve 64, and the two ends of the fixed sleeve 64 are respectively fixedly connected to the guide shell 61 and the rotating rod 4. At the same time, in this embodiment, the connecting rod 66 is L-shaped, so that one end of the connecting rod 66 is conveniently connected to the synchronous 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 respectively fixedly connected to the clamping block 8 on one side outside the moving opening 611;

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

[0057] The connecting member 65 includes a fixed plate 651, a sliding rod 652 and a bidirectional threaded rod 653. Two fixed plates 651 are provided. Both fixed plates 651 are fixedly mounted on the inner side of the guide housing 61. Both ends of the sliding 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. The bidirectional threaded rod 653 is connected to the synchronization mechanism 7.

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

[0059] The synchronization mechanism 7 includes a moving sleeve 71, a first rotating gear 72, a second rotating gear 73 and a rotating member 74. The gear sleeve is slidably sleeved on the outside of the rotating rod 4. The first rotating gear 72 is located on the inside of the guide shell 61, and the second rotating gear 73 is located on the inside of the supporting shell 3. A plurality of annular tooth grooves 711 are provided on the moving sleeve 71 at equal distances. The first rotating gear 72 and the second rotating gear 73 are respectively meshed and connected with the annular tooth grooves 711.

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

[0061] The rotating member 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 supporting shell 3, and the output end of the rotating motor 741 passes through one side of the supporting shell 3 and is fixedly connected to the worm 742. The output end of the rotating motor 741 is rotatably connected to the supporting 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 supporting shell 3, and one end of the rotating rod 744 is fixedly connected to the connecting plate 745.

[0063] Specific implementation process: when one end of the small-diameter core rod 10 is clamped, one end of the core rod 10 is brought into contact with the guide housing 61, and then, by rotating the motor 741, the worm 742 is further driven to rotate the worm wheel 743, and when the worm wheel 743 rotates, the rotating rod 744 drives the second rotating gear 73 to rotate, and because the second rotating gear 73 is meshed with the annular tooth groove 711, when the second rotating gear 73 rotates, the annular tooth groove 711 pushes the movable sleeve 71 to move along the guide housing 61, and when the movable sleeve 71 moves, the multiple annular tooth grooves 711 thereon further synchronously push the first rotating gear 72 to rotate relative to the guide housing 61;

[0064] When the first rotating gear 72 rotates, the bidirectional threaded rod 653 rotates relative to the two fixed plates 651, and when the bidirectional threaded rod 653 rotates, a driving force in opposite directions is provided to the two first moving blocks 62. At this time, under the limiting action of the sliding rod 652, the two first moving blocks 62 move in opposite directions, and because the first moving blocks 62 move at the same time, under the connecting action of the connecting support rod 66, at this time, multiple connecting support rods 66 drive the synchronous plate 67 to rotate relative to the fixed sleeve 64. Further, when the four connecting support rods 66 rotate, due to the limiting action of the four moving openings 611 on the guide shell 61, the two first moving blocks 62 and the two second moving blocks 63 move toward 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] During the rolling process of the small-diameter steel pipe, the rotating motor is operated to rotate the rotating rod 4 relative to the supporting shell 3. When the rotating rod 4 rotates, the fixed sleeve 64 and the clamping block 8 further drive the core rod 10 to rotate synchronously. At the same time, the first rotating gear 72 rotates around the gear groove of the movable sleeve 71, so that the core rod 10 cooperates with the cold rolling mill to achieve the effect of stable rolling of the small-diameter steel pipe.

[0066] See also Figures 9 to 11 A plurality of 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. An inner edge 81 and an outer edge 82 are provided at one end of the clamping block 8 away from the supporting shell 3, and a movable groove 83 is formed between the inner edge 81 and the outer edge 82. The positioning detection mechanisms 9 are located between the plurality of movable 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. Two arc plates 91 are provided. The two arc plates 91 slide through the four movable grooves 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 groove 101 at the position corresponding to the two positioning blocks 92.

[0068] A groove is provided at the inner edge 81 of the clamping block 8, and the laser sensor 93 is installed inside the groove, and the positioning block 92 is made of a transparent material;

[0069] The buzzer 94 is mounted on the supporting shell 3 , and a plurality of positioning openings are provided at the outer edge 82 . A plurality of guide members 95 are provided, and the guide members 95 are evenly distributed at the moving grooves 83 , and the guide members 95 pass through the positioning openings.

[0070] The guide member 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 openings. One end of the guide frame 951 located outside the positioning opening is provided with two limiting protrusions.

[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 , and both 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 semicircular in shape, and a T-shaped guide column 9521 is installed on the side of the guide block 952 away from the clamping block 8. A limiting groove 911 is provided at the position of the arc plate 91 corresponding to the guide column 9521. The semicircular shape enables the 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, thereby ensuring that the clamping block 8 rotates relative to the arc plate 91 through the multiple guide blocks 952. At the same time, the guide column 9521 and the limiting groove 911 are correspondingly provided on the arc plate 91, so that the arc plate 91 is always slidably connected with the multiple guide columns 9521 through the limiting groove 911, that is, the multiple guide columns 9521 further limit the arc plate 91.

[0073] Specific implementation process: When the small-diameter steel pipe outside 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 separated from the core rod 10, and the clamping blocks 8 are separated from the position of the core rod 10. In this state, the connecting spring 953 is in a naturally stretched state and does not cause extrusion to the arc rod;

[0074] The positioning blocks 92 at the two arc plates 91 are both located at the two positioning grooves 101 at one end of the core rod 10. Then, the laser sensor 93 is operated, and the four clamping blocks 8 are rotated relative to one end of the core rod 10. When the clamping block 8 rotates, since the arc plate 91 is fixed relative to the core rod 10, the positioning blocks 92 at the two arc plates 91 support the core rod 10, and then the 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 is bent, the laser sensor 93 sends a signal to the controller, and the controller controls the buzzer 94 to warn, so that the staff can replace or repair the core rod 10.

[0075] When the straightness of the core rod 10 remains within the set range, the four clamping blocks 8 move toward 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] Embodiment 2

[0077] See also Fig.12 , Embodiment 2 is a further supplementary explanation of Embodiment 1, specifically: a connection groove 84 is provided on the inner side of the clamping block 8, a pressure sensor 85 is installed at the connection groove 84, and a contact plate 86 is installed on one side of the pressure sensor 85, a plurality of buffer springs 87 are fixedly installed on the contact plate 86, and one end of the plurality of buffer springs 87 is fixedly connected to a clamping block 88, and the clamping block 88 slides through the connection groove 84;

[0078] Thus, while the multiple clamping blocks 8 clamp one end of the core rod 10, the clamping block 88 on the clamping block 8 is in synchronous contact with the outer side of the core rod 10, and 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, and the pressure sensor 85 reaches the set value, indicating 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 large, the buzzer 94 warns, thereby realizing the function of detecting the clamping of the core rod 10 to prevent the core rod 10 from being clamped too tightly or too loosely.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A cold rolling mill for small-diameter steel pipes clamped by a core rod, 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 a side of the support shell (3) close to the cold rolling mill body (1); a through hole (311) is provided at the center of the support plate (31); a rotating rod (4) passes through the through hole (311); and the rotating rod (4) is rotatably connected to the support shell (3); A driving mechanism (5) for driving the rotating rod (4) is installed on the supporting shell (3); 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 supporting shell (3); The clamping linkage mechanism (6) is connected to a plurality of clamping blocks (8), and the plurality of clamping blocks (8) are used to clamp the core rod (10) with each other; Positioning detection mechanisms (9) are provided between the plurality of clamping blocks (8), and the positioning detection mechanisms (9) detect the straightness of the core rod (10).

2. A cold rolling mill for small-diameter steel pipes clamped by a core rod according to claim 1, characterized in that: The driving mechanism (5) comprises a driving motor (51), a first driving gear (52) and a second driving gear (53); the driving motor (51) is fixedly mounted on the outside of the supporting shell (3); the output end of the driving motor (51) is located inside the supporting shell (3) and is fixedly connected to the first driving gear (52); the output end of the driving motor (51) is rotatably connected to the supporting shell (3); the first driving gear (52) is meshedly connected to the second driving gear (53); and the second driving gear (53) is fixedly sleeved on the outside of the rotating rod (4).

3. The small diameter steel tube cold rolling mill with core rod clamping according to claim 1, characterized in that: The clamping linkage mechanism (6) comprises a guide shell (61), a first moving block (62), a second moving block (63), a fixed sleeve (64) and a connecting piece (65); the guide shell (61) is rotatably connected to the outside of the supporting shell (3); four moving openings (611) are provided on the guide shell (61); two of the first moving blocks (62) and two of the second moving blocks (63) are provided; the two first moving blocks (62) and the two second moving blocks (63) respectively slide through the moving openings (611); and the first moving blocks (62) and the second moving blocks (63) are distributed on the guide shell (61) at a vertical angle; One end of the first moving block (62) and the second moving block (63) located inside the guide shell (61) is rotatably connected to a connecting rod (66) via a pin shaft, and one end of the four connecting rods (66) close to each other is rotatably connected to a synchronous plate (67) via a pin shaft, and the synchronous plate (67) is rotatably sleeved on the outside of a fixed sleeve (64), and the two ends of the fixed sleeve (64) are respectively fixedly connected to the guide shell (61) and the rotating rod (4); The two first moving blocks (62) and the second moving block (63) are respectively fixedly connected to the clamping block (8) on one side located outside the moving opening (611); The connecting member (65) is located inside the guide shell (61), the connecting member (65) is connected to two first moving blocks (62), and the first moving blocks (62) are driven by a synchronization mechanism (7).

4. A cold rolling mill for small-diameter steel pipes clamped by a core rod according to claim 3, characterized in that: The connecting member (65) comprises a fixed plate (651), a sliding rod (652) and a bidirectional threaded rod (653). Two fixed plates (651) are provided. The two fixed plates (651) are fixedly mounted on the inner side of the guide shell (61). The two ends of the sliding rod (652) are respectively fixedly connected to the two fixed plates (651). The bidirectional threaded rod (653) is rotatably connected between the two fixed plates (651). The bidirectional threaded rod (653) is connected to the synchronization mechanism (7). The two first moving blocks (62) are slidably sleeved on the outside of the sliding rod (652), and the two first moving blocks (62) are respectively threadedly sleeved on the two ends of the bidirectional threaded rod (653).

5. The small diameter steel tube cold rolling mill with core rod clamping according to claim 4, characterized in that: The synchronization mechanism (7) comprises a movable sleeve (71), a first rotating gear (72), a second rotating gear (73) and a rotating member (74); the gear sleeve is slidably sleeved on the outside of the rotating rod (4); the first rotating gear (72) is located on the inside of the guide shell (61); and the second rotating gear (73) is located on the inside of the supporting shell (3); a plurality of annular tooth grooves (711) are equidistantly provided on the movable sleeve (71); the first rotating gear (72) and the second rotating gear (73) are respectively meshed and connected with the annular tooth grooves (711); The first rotating gear (72) is fixedly sleeved on the outside of the bidirectional threaded rod (653), and the rotating member (74) is used to drive the second rotating gear (73).

6. A cold rolling mill for small diameter steel pipes clamped by a core rod according to claim 5, characterized in that: The rotating member (74) comprises 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 supporting shell (3); and the output end of the rotating motor (741) passes through one side of the supporting shell (3) and is fixedly connected to the worm (742); the output end of the rotating motor (741) is rotationally connected to the supporting shell (3); and the worm (742) is rotationally 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 supporting shell (3), and one end of the rotating rod (744) is fixedly connected to the connecting plate (745).

7. The small diameter steel tube cold rolling mill with core rod clamping according to claim 1, characterized in that: An inner edge (81) and an outer edge (82) are respectively provided at one end of the clamping block (8) away from the supporting shell (3), a movable groove (83) is formed between the inner edge (81) and the outer edge (82), and the positioning detection mechanism (9) is located between the plurality of movable grooves (83).

8. The small diameter steel tube cold rolling mill with core rod clamping according to claim 7, characterized in that: The positioning detection mechanism (9) comprises an arc-shaped plate (91), a positioning block (92), a laser sensor (93), a buzzer (94) and a guide member (95); two arc-shaped plates (91) are provided, and the two arc-shaped plates (91) slide through four movable grooves (83); the positioning block (92) is fixedly mounted on the inner side of the arc-shaped plate (91), and the core rod (10) is provided with positioning grooves (101) at positions corresponding to the two positioning blocks (92); A groove is provided at the inner edge (81) of the clamping block (8), and a laser sensor (93) is installed inside the groove; the positioning block (92) is made of a transparent material; The buzzer (94) is mounted on the supporting shell (3), a plurality of positioning openings are provided at the outer edge (82), a plurality of guide members (95) are provided, the guide members (95) are distributed at equal distances at the moving groove (83), and the guide members (95) pass through the positioning openings.

9. A cold rolling mill for small diameter steel pipes clamped by a core rod according to claim 8, characterized in that: The guide member (95) comprises a guide frame (951), a guide block (952) and a connecting spring (953); the guide frame (951) is U-shaped, and two ends of the guide frame (951) slide through two positioning openings; one end of the guide frame (951) located outside the positioning opening is provided with two limiting protrusions; 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), and the two ends of the connection spring (953) are respectively fixedly connected to the guide frame (951) and the outer edge (82).

10. The small diameter steel tube cold rolling mill with core rod clamping according to claim 9, characterized in that: The guide block (952) is semicircular in shape, a T-shaped guide column (9521) is installed on the side of the guide block (952) away from the clamping block (8), and a limiting groove (911) is provided at a position of the arc plate (91) corresponding to the guide column (9521).

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