Seamless steel pipe cold drawing device

Abstract

The application discloses a seamless steel pipe cold-drawing device, which comprises a base, an outer wall forming assembly, an inner wall forming assembly and a drawing assembly adapted to draw and move the steel pipe, the outer wall forming assembly comprises an outer die with an outer pressure forming cavity used for forming the outer wall of the steel pipe during the drawing and moving of the steel pipe, the inner wall forming assembly comprises a cold-drawing core rod part and a core rod moving part, the core rod moving part is installed on the base and connected with the cold-drawing core rod part to drive the axial movement of the cold-drawing core rod part, the core rod moving part comprises a core rod moving seat axially slidably connected with the base, the cold-drawing core rod part comprises a connecting handle part and a cold-drawing head used for forming the inner wall of the steel pipe during the drawing and moving of the steel pipe and matched with the outer die to cold-draw the steel pipe, and the cold-drawing head is connected with the front end of the connecting handle part, which can not only well complete the cold-drawing process of the seamless steel pipe, but also well support the cold-drawing core rod part, thereby improving the production quality of the steel pipe.

Description

Technical Field

[0001] This invention relates to a cold drawing device for seamless steel pipes, belonging to the field of seamless steel pipe manufacturing technology. Background Technology

[0002] Currently, in the field of seamless steel pipe production and processing, cold drawing is a key process in the preparation of seamless steel pipes. During the cold drawing process, the mandrel, as the core component, needs to be precisely passed through the steel pipe to be processed. When the steel pipe is drawn through the drawing forming die, it provides stable support for the inside of the steel pipe, ensuring that the steel pipe can be deformed according to the predetermined shape and size during the cold drawing process, thereby obtaining high-quality seamless steel pipe products.

[0003] Patent CN117798205B discloses a cold drawing machine for steel pipe processing, which includes a cold drawing machine drive mechanism, a clamping mechanism, and several mandrel support mechanisms (located on one side of the drive mechanism and including a mounting plate). The cold drawing machine has a reasonable structure, and the pipe stabilization mechanism can keep the steel pipe on the same axis and uniformly stressed during cold drawing, reducing damage from hard pulling. However, the mandrel support mechanism it uses is only a single bottom support. In actual production, the mandrel will be subjected to the reaction force from the inner wall of the steel pipe and the dynamic force during the drawing process. Since the mandrel itself is long and lacks sufficient support, the insufficient bottom support will lead to a decrease in the production quality of seamless steel pipes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a seamless steel pipe cold drawing device, which can not only complete the cold drawing process of seamless steel pipe well, but also support the cold drawing mandrel component well, thereby improving the production quality of seamless steel pipe.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a seamless steel pipe cold drawing device, comprising:

[0006] Base;

[0007] An outer wall forming assembly mounted on the base, the outer wall forming assembly including an outer mold having an external pressure forming cavity for forming the outer wall of the steel pipe during the steel pipe drawing and moving process;

[0008] An inner wall forming assembly includes a cold-drawn mandrel component and a mandrel moving component. The mandrel moving component is mounted on the base and connected to the cold-drawn mandrel component to drive the cold-drawn mandrel component to move axially. The mandrel moving component includes a mandrel moving seat that is axially slidably connected to the base. The cold-drawn mandrel component includes a connecting shank and a cold-drawing head for forming the inner wall of the steel pipe during the steel pipe drawing process and is configured to cooperate with the outer mold for cold drawing the steel pipe. The cold-drawing head is connected to the front end of the connecting shank and the rear end of the connecting shank is connected to the mandrel moving seat.

[0009] A drawing assembly suitable for drawing and moving steel pipes includes a drawing moving seat, a drawing moving drive component, and an external clamping mechanism and an internal support head for steel pipes, all mounted on the drawing moving seat. The drawing moving seat is slidably disposed on the base. The drawing moving drive component is connected to the drawing moving seat to drive the drawing moving seat to move axially. The internal support head is adapted to move axially within the drawing moving seat and slide to connect with and support the front end of the connecting handle.

[0010] Furthermore, the seamless steel pipe cold drawing device also includes:

[0011] A necking mechanism is mounted on the base, and the necking mechanism, the outer mold, and the drawing movable seat are arranged sequentially from front to back.

[0012] A steel pipe pushing assembly, the steel pipe pushing assembly being adapted to push a steel pipe backward, the steel pipe having a constriction station and a drawing and clamping station in sequence during the backward pushing process;

[0013] When the steel pipe is in the necking position, the cold drawing head is located inside the end of the steel pipe and the inner support head is located inside the end of the steel pipe and aligned with the necking mechanism. Then the necking mechanism is activated to neck the end of the steel pipe and hold it on the inner support head to form a necked part.

[0014] When the steel pipe is in the drawing and clamping station, the outer wall of the constricted part of the steel pipe is clamped before drawing by the external clamping mechanism.

[0015] Furthermore, the external pressure forming cavity includes, from front to back, an opening with a gradually decreasing diameter and a forming part connecting the opening.

[0016] Furthermore, the mandrel moving component also includes a mandrel moving motor and a mandrel moving screw. The mandrel moving screw is rotatably connected to the base, the mandrel moving motor is mounted on the base, and the mandrel moving motor is connected to the mandrel moving screw to drive the mandrel moving screw to rotate. The mandrel moving seat is connected to the mandrel moving screw to form a screw-nut pair.

[0017] Furthermore, the pulling and moving drive component includes a pulling and moving motor and a pulling and moving screw. The pulling and moving screw is rotatably connected to the base, the pulling and moving motor is mounted on the base, and the pulling and moving motor is connected to the pulling and moving screw to drive the pulling and moving screw to rotate. The pulling and moving seat is connected to the pulling and moving screw to form a screw and nut pair.

[0018] Furthermore, the external clamping mechanism for the steel pipe includes:

[0019] Mounting plate disposed on the pull-out movable seat;

[0020] A bidirectional screw is rotatably connected to the mounting plate;

[0021] Two clamping plates are connected to two oppositely arranged threads on the bidirectional screw and move toward each other to clamp the outer wall of the steel pipe or move away from each other to loosen the outer wall of the steel pipe when the bidirectional screw rotates.

[0022] A clamping motor is connected to the bidirectional screw to drive the bidirectional screw to rotate, and the clamping motor is mounted on the mounting plate.

[0023] Furthermore, the inner support head is provided with a plurality of telescopic extrusion blocks along the circumferential direction. The telescopic extrusion blocks are adapted to move radially on the inner support head. An elastic element is provided between the telescopic extrusion blocks and the inner support head. The telescopic extrusion blocks are provided with inclined portions on both sides of the inner support head along the axial direction.

[0024] Furthermore, the seamless steel pipe cold drawing device also includes a steel pipe axial feed assembly;

[0025] The drawing moving seat has a necking forming cavity for forming the outer wall of the necking part of the steel pipe. The diameter of the necking forming cavity is equal to the outer diameter of the cold-drawn steel pipe.

[0026] An elastic component is provided between the inner support head and the pull-out moving seat to act on the inner support head and restore its axial position.

[0027] The rear part of the cold drawing head is provided with an axially rearwardly extending extrusion cone;

[0028] The steel pipe axial feeding assembly is adapted to feed the steel pipe axially after the steel pipe external clamping mechanism releases its grip on the steel pipe so that the entire constricted portion enters the constricted portion forming cavity.

[0029] The external clamping mechanism for the steel pipe is also adapted to clamp the steel pipe after the entire constricted section has entered the constricted section forming cavity.

[0030] The cold drawing head is also adapted to move backward after the entire constricted portion has entered the constricted portion forming cavity and the steel pipe is clamped by the external clamping mechanism, so as to cooperate with the constricted portion forming cavity to form the constricted portion.

[0031] Furthermore, the inner ring of the inner support head is rotatably connected to a rotating ring, and the connecting handle is axially slidably connected to and supported on the rotating ring;

[0032] The drawing assembly also includes a steel pipe rotation drive mechanism connected to the outer clamping mechanism and the inner support head to drive the outer clamping mechanism and the inner support head to rotate, thereby causing the steel pipe connected thereto to rotate.

[0033] Furthermore, the steel pipe rotation drive mechanism includes:

[0034] A steel pipe rotary motor mounted on the pulling movable seat;

[0035] Rotatably connected to the connecting rod on the pull-out movable seat;

[0036] A first driving gear and a second driving gear are connected to the connecting rod;

[0037] A first driven gear meshes with the first driving gear, and the first driven gear is connected to the steel pipe external clamping mechanism;

[0038] A second driven gear meshes with the second driving gear, and the second driven gear is connected to the inner support head; wherein...

[0039] Both the first driven gear and the second driven gear are rotatably connected to the pull-out moving seat.

[0040] After adopting the above technical solution, the present invention has the following beneficial effects:

[0041] 1. When the steel pipe is pushed to the necking position by the steel pipe pushing assembly, the moving mandrel component moves the cold drawing mandrel component, positioning the cold drawing head inside the end of the steel pipe. The pulling moving drive component moves the pulling moving seat forward, positioning the inner support head inside the end of the steel pipe and aligning it with the necking mechanism. Then, the necking mechanism necks the end of the steel pipe and holds it on the inner support head to form the necked section. Next, the steel pipe pushing assembly pushes the steel pipe to the pulling clamping position. Then, the moving mandrel component moves the cold drawing mandrel component backward, aligning the cold drawing head with the outer mold. Finally, the outer wall of the clamping section at the end of the steel pipe is pulled by the steel pipe outer clamping mechanism. Clamping is then activated. At this point, the action pull-out drive component drives the pull-out moving seat to move axially backward, thereby moving the steel pipe through the outer pressure forming cavity of the outer mold and the cold drawing head. During the steel pipe pull-out process, the outer pressure forming cavity forms the outer wall of the steel pipe, and the cold drawing head forms the inner wall of the steel pipe. Through the cooperation of the outer mold and the cold drawing head, the steel pipe is cold-drawn to achieve the required dimensions, thus enabling efficient cold drawing of the steel pipe. During this process, the rear end of the connecting handle of the cold drawing mandrel component is connected to the mandrel moving seat, and the front end of the connecting handle is slidably connected to and supported on the inner support head, thereby providing good support for the cold drawing mandrel component and improving the production quality of seamless steel pipes.

[0042] 2. The drawing moving seat of the present invention is provided with a necking section forming cavity. After the drawing moving seat moves backward into position (i.e., the steel pipe except for the necking section is cold-drawn), the steel pipe external clamping mechanism is activated to loosen the clamp on the steel pipe. Then, the steel pipe is axially fed backward by the steel pipe axial feeding assembly so that the entire necking section enters the necking section forming cavity. The steel pipe is then clamped by the steel pipe external clamping mechanism. Then, the mandrel moving component is activated to drive the cold drawing mandrel component to move axially backward, thereby driving the cold drawing head to move backward. During the backward movement of the cold drawing head, it will cooperate with the necking section forming cavity to form the necking section. During the backward movement of the cold drawing head, it will abut and push the inner support head to move backward, thereby disengaging from the necking section. The necking section forming cavity forms the outer wall of the necking section, and the cold drawing head forms the inner wall of the necking section, thereby achieving the required steel pipe size. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the seamless steel pipe cold drawing device of the present invention;

[0044] Figure 2 This is a partial cross-sectional view of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the pull-out moving seat of the present invention;

[0046] Figure 4 This is a schematic diagram of the internal structure of the pull-out moving seat of the present invention. Figure 1 ;

[0047] Figure 5 This is a schematic diagram of the internal structure of the pull-out moving seat of the present invention. Figure 2 ;

[0048] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0049] Figure 7 This is a schematic diagram of the steel pipe axial feed assembly structure of the present invention;

[0050] In the diagram: 1. Base;

[0051] 2. Outer wall forming assembly; 21. External pressure forming cavity;

[0052] 3. Inner wall forming assembly; 31. Cold drawn mandrel assembly; 32. Mandrel moving assembly; 33. Mandrel moving seat; 34. Connecting shank; 35. Cold drawing head; 36. Extrusion cone;

[0053] 321. Mandrel moving motor; 322. Mandrel moving screw;

[0054] 4. Drawing assembly; 41. Drawing moving seat; 42. Drawing moving drive component; 43. Steel pipe external clamping mechanism; 44. Inner support head; 45. Elastic component; 46. Narrowing forming cavity; 47. Rotating ring;

[0055] 421. Pulling the moving motor; 422. Pulling the moving screw;

[0056] 431. Mounting plate; 432. Double-acting screw; 433. Clamping plate; 434. Motor clamping device;

[0057] 441. Telescopic extrusion block; 442. Elastic element; 443. Inclined part;

[0058] 5. Narrowing mechanism; 51. Narrowing pressure plate; 52. Narrowing drive component;

[0059] 6. Steel pipe drive assembly;

[0060] 7. Axial feed assembly for steel pipe; 71. Lifting component; 72. Feed frame; 73. Receiving roller; 74. Feed motor; 75. Feed screw; 76. Feed push plate;

[0061] 8. Steel pipe rotation drive mechanism; 81. Steel pipe rotation motor; 82. Connecting rod; 83. First driving gear; 84. Second driving gear; 85. First driven gear; 86. Second driven gear;

[0062] 9. Steel pipe support assembly; 91. Support roller; 92. Upper limit roller; 93. Lower limit roller; 94. Telescopic cylinder. Detailed Implementation

[0063] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0064] Example 1: As Figure 1-3 As shown, a seamless steel pipe cold drawing device includes:

[0065] Base 1;

[0066] An outer wall forming component 2 is installed on the base 1. The outer wall forming component 2 includes an outer mold with an external pressure forming cavity 21, which is used to form the outer wall of the steel pipe during the steel pipe drawing and moving process.

[0067] The inner wall forming component 3 includes a cold-drawn mandrel component 31 and a mandrel moving component 32. The mandrel moving component 32 is mounted on the base 1 and connected to the cold-drawn mandrel component 31 to drive the cold-drawn mandrel component 31 to move axially. The mandrel moving component 32 includes a mandrel moving seat 33 that is axially slidably connected to the base 1. The cold-drawn mandrel component 31 includes a connecting handle 34 and a cold-drawing head 35 for forming the inner wall of the steel pipe during the steel pipe drawing process and is configured to cooperate with the outer mold to cold-draw the steel pipe. The cold-drawing head 35 is connected to the front end of the connecting handle 34 and the rear end of the connecting handle 34 is connected to the mandrel moving seat 33.

[0068] A drawing assembly 4 is suitable for drawing and moving steel pipes. The drawing assembly 4 includes a drawing moving seat 41, a drawing moving drive component 42, and a steel pipe external clamping mechanism 43 and an inner support head 44, all mounted on the drawing moving seat 41. The drawing moving seat 41 is slidably disposed on the base 1. The drawing moving drive component 42 is connected to the drawing moving seat 41 to drive the drawing moving seat 41 to move axially. The inner support head 44 is adapted to move axially within the drawing moving seat 41 and slide to connect with and support the front end of the connecting handle 34.

[0069] The necking mechanism 5 is installed on the base 1. The necking mechanism 5, the outer mold and the drawing moving seat 41 are arranged in sequence from front to back.

[0070] The steel pipe pushing assembly 6 is suitable for pushing the steel pipe backward. During the backward pushing process, the steel pipe has a constriction station and a pulling and clamping station in sequence.

[0071] When the steel pipe is in the necking position, the cold drawing head 35 is located inside the end of the steel pipe and the inner support head 44 is located inside the end of the steel pipe and is aligned with the necking mechanism 5. Then the necking mechanism 5 is activated to neck the end of the steel pipe and hold it on the inner support head 44 to form a necked part.

[0072] When the steel pipe is in the drawing and clamping station, the outer wall of the constricted part of the steel pipe is clamped before drawing by the steel pipe external clamping mechanism 43.

[0073] In this embodiment, as Figure 2 As shown, the seamless steel pipe cold drawing device also includes a steel pipe support assembly 9, which can specifically be multiple support rollers 91, and the support rollers 91 can be raised and lowered; the steel pipe is supported by raising the support rollers 91, and the steel pipe is de-supported by lowering the support rollers 91.

[0074] The seamless steel pipe cold drawing device may also include at least one limiting mechanism that limits the steel pipe when the pipe end of the pipe is narrowed by the narrowing mechanism 5. The limiting mechanism may specifically have the following structure: including a bracket, an upper limit roller 92 and a lower limit roller 93 set on the bracket and vertically aligned, and a telescopic cylinder 94 connected to the upper limit roller 92.

[0075] The bracket is set on the base 1, the lower limit roller 93 is set on the bracket, the upper limit roller 92 is vertically slidably set on the bracket, the telescopic cylinder 94 is installed on the bracket and the movable end of the telescopic cylinder 94 is connected to the upper limit roller 92 to drive the upper limit roller 92 to move, thereby adjusting the distance between the upper limit roller 92 and the lower limit roller 93, so as to clamp or release the steel pipe.

[0076] like Figure 1 As shown, the steel pipe pushing assembly 6 can be a pushing piston cylinder, with a push plate installed on its moving end for pushing the steel pipe.

[0077] like Figure 3 As shown, the necking mechanism 5 can adopt the following structure: it includes multiple extrusion components mounted on the base 1. The extrusion components include a necking pressure plate 51 for contacting the steel pipe and a necking drive component 52 connected to the necking pressure plate 51 and driving the necking pressure plate 51 to move.

[0078] The necking drive 52 is adapted to drive the corresponding necking pressure plate 51 to move, thereby causing the necking pressure plate 51 to apply pressure to the steel pipe to form a necked section.

[0079] Specifically, the necking drive component 52 can be an electric cylinder or a pneumatic cylinder, etc.

[0080] In this embodiment, the steel pipe can first be supported on the support roller 91, and then the steel pipe is pushed to the necking position by the steel pipe pushing assembly 6. At this time, the cold drawing mandrel assembly 31 is moved by the moving mandrel moving component 32 so that the cold drawing head 35 is located inside the end of the steel pipe, and the moving drawing moving drive component 42 moves the drawing moving seat 41 forward so that the inner support head 44 is located inside the end of the steel pipe and aligned with the necking mechanism 5. At this time, the upper limit roller 92 and the lower limit roller 93 cooperate to adjust the steel pipe. The pipe is clamped, and then the tapering mechanism 5 tapes the end of the clamped steel pipe and holds it on the inner support head 44 to form a tapered section. After the upper limit roller 92 and lower limit roller 93 release the clamping of the steel pipe, the steel pipe pushing assembly 6 pushes the steel pipe backward so that the tapered section passes through the outer pressure forming cavity 21 of the outer mold until the steel pipe is in the drawing clamping position. Then, the mandrel moving component 32 drives the cold drawing mandrel component 31 to move backward so that the cold drawing head 35 and the outer mold are aligned. When the steel pipe is in the drawing clamping position, the cold drawing head 35 is aligned with the outer mold. When the pipe is in the drawing and clamping position, the outer wall of the constricted end of the pipe is clamped before drawing by the outer clamping mechanism 43. At this time, the drawing and moving drive component 42 is activated, driving the drawing moving seat 41 to move axially backward, thereby moving the pipe through the outer pressure forming cavity 21 of the outer mold and the cold drawing head 35. The outer pressure forming cavity 21 forms the outer wall of the pipe during the drawing and moving process, and the cold drawing head 35 forms the inner wall of the pipe during the drawing and moving process. Through the cooperation of the outer mold and the cold drawing head 35, the pipe is drawn and clamped. The steel pipe is cold-drawn to the required dimensions, thus enabling efficient cold drawing of the steel pipe. During this process, the rear end of the connecting handle 34 of the cold-drawn mandrel component 31 is connected to the mandrel moving seat 33, and the front end of the connecting handle 34 is slidably connected to and supported on the inner support head 44, thereby providing good support for the cold-drawn mandrel component 31. The steel pipe external clamping mechanism 43 and the inner support head 44 cooperate with each other to provide support for the cold-drawn mandrel component 31 when clamping the steel pipe, thereby improving the production quality of seamless steel pipes.

[0081] In this embodiment, the external pressure forming cavity 21 includes, from front to back, an opening with a gradually decreasing diameter and a forming part that connects to the opening; the opening is designed to allow the steel pipe and its constricted portion to enter the forming part well, which facilitates the forming of the outer wall of the steel pipe.

[0082] Specifically, in this embodiment, such as Figure 1 As shown, the mandrel moving component 32 can specifically have the following structure: it also includes a mandrel moving motor 321 and a mandrel moving screw 322. The mandrel moving screw 322 is rotatably connected to the base 1. The mandrel moving motor 321 is mounted on the base 1. The mandrel moving motor 321 is connected to the mandrel moving screw 322 to drive the mandrel moving screw 322 to rotate. The mandrel moving seat 33 is connected to the mandrel moving screw 322 to form a screw and nut pair. Specifically, the mandrel moving seat 33 can be slidably connected to the base 1 through a guide rail pair.

[0083] In this embodiment, by controlling the mandrel moving motor 321 to move, the mandrel moving screw 322 is driven to rotate, thereby driving the mandrel moving seat 33 to move axially, so that the cold-drawn mandrel component 31 connected to the mandrel moving seat 33 can move axially, thereby allowing the cold-drawn head 35 to enter the steel pipe or extend out of the steel pipe.

[0084] Specifically, such as Figure 1-2 As shown, the pulling and moving drive component 42 can specifically have the following structure: it includes a pulling and moving motor 421 and a pulling and moving screw 422. The pulling and moving screw 422 is rotatably connected to the base 1. The pulling and moving motor 421 is mounted on the base 1. The pulling and moving motor 421 is connected to the pulling and moving screw 422 to drive the pulling and moving screw 422 to rotate. The pulling and moving seat 41 is connected to the pulling and moving screw 422 to form a screw and nut pair.

[0085] In this embodiment, by controlling the action of the pulling moving motor 421, the pulling moving screw 422 is driven to rotate, thereby driving the pulling moving seat 41 to move axially, thereby driving the steel pipe outer clamping mechanism 43 and inner support head 44 installed thereon to move together, thereby driving the steel pipe to be pulled and moved.

[0086] Specifically, such as Figure 2-4 As shown, in this embodiment, the steel pipe external clamping mechanism 43 can specifically have the following structure: including:

[0087] Mounting plate 431 is provided on the pull-out movable seat 41;

[0088] A bidirectional screw 432 is rotatably connected to the mounting plate 431;

[0089] Two clamping plates 433 are connected to two oppositely arranged threads on the bidirectional screw 432 and move toward each other to clamp the outer wall of the steel pipe or move away from each other to loosen the outer wall of the steel pipe when the bidirectional screw 432 rotates.

[0090] A clamping motor 434 is connected to the bidirectional screw 432 to drive the bidirectional screw 432 to rotate, and the clamping motor 434 is mounted on the mounting plate 431.

[0091] Specifically, a buffer pad can be installed on the clamping surface of the two clamping plates 433 to avoid damaging the outer wall of the steel pipe;

[0092] Furthermore, the clamping plate 433 can be configured as a V-shaped clamping block to facilitate clamping of the outer wall of the constricted section of the steel pipe or the outer wall of the steel pipe after cold drawing and forming, as needed.

[0093] When it is necessary to clamp the steel pipe, the clamping motor 434 is activated to drive the bidirectional screw 432 to rotate, thereby causing the two clamping plates 433 to move towards each other to clamp the outer wall of the steel pipe or move away from each other to loosen the outer wall of the steel pipe.

[0094] Specifically, in order for the inner support head 44 to fit well into the interior of the steel pipe and to provide good support for the steel pipe, such as Figure 5-6 As shown, the inner support head 44 is circumferentially fitted with multiple telescopic blocks 441. The telescopic blocks 441 are adapted to move radially on the inner support head 44. An elastic element 442 is provided between the telescopic blocks 441 and the inner support head 44. The telescopic blocks 441 have inclined portions 443 on both sides of the inner support head 44 in the axial direction. When the inner support head 44 enters the steel pipe axially, the steel pipe acts in the opposite direction on the telescopic blocks 441, causing the telescopic blocks 441 to retract towards the center of the inner support head 44. This allows the inner support head 44 to enter the steel pipe, and the elastic force of the elastic element 442 can effectively support the steel pipe.

[0095] Specifically, in order to enable the steel pipe to rotate and achieve rotary drawing, thereby improving the cold drawing of the steel pipe, such as... Figure 5 As shown, the inner ring of the inner support head 44 is rotatably connected to the rotating ring 47, and the connecting handle 34 is axially slidably connected and supported on the rotating ring 47.

[0096] The drawing assembly 4 also includes a steel pipe rotation drive mechanism 8, which is connected to the outer clamping mechanism 43 and the inner support head 44 of the steel pipe to drive the outer clamping mechanism 43 and the inner support head 44 to rotate so as to drive the steel pipe connected thereto to rotate.

[0097] Specifically, in this embodiment, such as Figure 6 As shown, in order to achieve the sliding connection of the inner support head 44 on the connecting handle 34, the rotating ring 47 forms a keyway connection with the connecting handle 34.

[0098] When the outer clamping mechanism 43 and the inner support head 44 of the steel pipe are driven to rotate, the cold-drawn mandrel component 31 is in a stationary state. Therefore, the inner support head 44 does not drive the rotating ring 47 to rotate when rotating, but it can move linearly through the keyway connection between the rotating ring 47 and the connecting handle 34 while rotating, so as to avoid affecting the cold-drawn head 35 located in the inner and outer pressure forming cavities 21 of the outer mold during the rotational drawing process.

[0099] Specifically, such as Figure 5 As shown, the steel pipe rotation drive mechanism 8 can specifically have the following structure: including:

[0100] A steel pipe rotary motor 81 is mounted on the pull-out moving base 41;

[0101] The connecting rod 82 is rotatably connected to the pull-out moving seat 41;

[0102] The first drive gear 83 and the second drive gear 84 are connected to the connecting rod 82;

[0103] The first driven gear 85 is meshed with the first driving gear 83, and the first driven gear 85 is connected to the mounting plate 431 in the steel pipe external clamping mechanism 43;

[0104] A second driven gear 86 meshes with the second driving gear 84, and the second driven gear 86 is connected to the inner support head 44; wherein...

[0105] Both the first driven gear 85 and the second driven gear 86 are rotatably connected to the pull-out moving seat 41.

[0106] In this embodiment, when the steel pipe needs to be rotated and pulled, the steel pipe rotation motor 81 is started to drive the connecting rod 82, the first driving gear 83 and the second driving gear 84 to rotate synchronously, which in turn drives the first driven gear 85 and the second driven gear 86 to rotate, causing the inner support head 44 and the steel pipe outer clamping mechanism 43 to rotate. The inner support head 44 and the steel pipe outer clamping mechanism 43 cooperate to support and clamp the steel pipe, thus driving the steel pipe to rotate synchronously.

[0107] Example 2: Figure 5 , Figure 7 As shown, in order to shape the constricted portion so as to directly utilize the constricted portion and avoid cutting the constricted portion in subsequent processes, this embodiment has the following structure based on embodiment one: the seamless steel pipe cold drawing device also includes a steel pipe axial feeding component 7.

[0108] The drawing moving seat 41 is provided with a necking forming cavity 46 for forming the outer wall of the necking part of the steel pipe. The diameter of the necking forming cavity 46 is equal to the outer diameter of the cold-drawn steel pipe. The outer diameter of the cold drawing head 35 is equal to the inner diameter of the cold-drawn steel pipe. The outer diameter of the inner support head 44 is smaller than the outer diameter of the cold drawing head 35.

[0109] An elastic component 45 is provided between the inner support head 44 and the pull-out moving seat 41 to act on the inner support head 44 to axially reset it;

[0110] The rear part of the cold drawing head 35 is provided with an axially rearwardly extending extrusion cone 36;

[0111] The steel pipe axial feeding assembly 7 is suitable for axially feeding the steel pipe after the steel pipe external clamping mechanism 43 releases the clamp on the steel pipe so that the entire constriction part enters the constriction part forming cavity 46.

[0112] The steel pipe external clamping mechanism 43 is also suitable for clamping the outer wall of the steel pipe after the entire constricted part of the steel pipe has entered the constricted part forming cavity 46.

[0113] The cold drawing head 35 is also suitable for moving backward after the entire narrowing section enters the narrowing section forming cavity 46 and the steel pipe external clamping mechanism 43 to clamp the steel pipe, so as to cooperate with the narrowing section forming cavity 46 to form the narrowing section.

[0114] In this embodiment, the elastic component 45 can specifically be the following structure, including at least one telescopic rod and a spring sleeved on the telescopic rod. The rear end of the telescopic rod is connected to the second driven gear 86 or a connector connected to the second driven gear 86. The inner support head 44 is fixedly disposed on the movable and retractable front end of the telescopic rod. One end of the spring is connected to the inner support head 44, and the other end of the spring is connected to the second driven gear 86 or a connector connected to the second driven gear 86, providing a restoring force for the inner support head 44 to reset.

[0115] In this embodiment, the steel pipe axial feeding assembly 7 can adopt the following structure: including a feeding frame 72 suitable for controlled up and down lifting, a feeding push plate 76 slidably disposed in the feeding frame 72 along the steel pipe axial direction, and an axial drive component connected to the feeding push plate 76 to drive the feeding push plate 76 to move.

[0116] Multiple receiving rollers 73 for supporting steel pipes are rotatably connected to the feed frame 72;

[0117] The axial drive component is adapted to move the feed pusher 76 to abut the end face of the steel pipe, thereby pushing the steel pipe supported by the receiving roller 73 to move.

[0118] In this embodiment, the drawing moving seat 41 is provided with a necking forming cavity 46. After the drawing moving seat 41 moves backward into place (i.e., the steel pipe is cold-drawn except for the necking part), the drawing moving seat 41 remains stationary. The steel pipe external clamping mechanism 43 is activated to release the clamp on the steel pipe. Then, the steel pipe axial feeding assembly 7 feeds the steel pipe axially backward so that the necking part enters the necking forming cavity 46 completely. The steel pipe external clamping mechanism 43 is then activated to clamp the steel pipe. Finally, the mandrel moving component 32 drives the cold drawing mandrel component 31 to move axially backward, thereby driving the cold drawing head 35. As the cold drawing head 35 moves backward, it cooperates with the necking forming cavity 46 to form the necking portion. During the backward movement of the cold drawing head 35, it abuts against and pushes the inner support head 44 to move backward, thereby disengaging from the necking portion. The necking forming cavity 46 forms the outer wall of the necking portion, while the cold drawing head 35 forms the inner wall of the necking portion, thereby achieving the required steel pipe size. After the cold drawing head 35 and the inner support head 44 are completely disengaged from the inside of the steel pipe, the steel pipe loses its support and is located on the steel pipe axial feed assembly 7. The steel pipe is then unloaded and transported by means of lifting or other methods.

[0119] In some embodiments, a removable mold can be installed on the drawing moving seat 41, and the narrowing forming cavity 46 is installed on the mold, so that the narrowing forming cavity 46 of the appropriate size can be adapted by changing the mold; of course, the cold drawing head 35 and the connecting handle 34 can also adopt a detachable structure to facilitate the replacement of the cold drawing head 35 of the appropriate size.

[0120] like Figure 7 As shown, a lifting component 71 is provided below the feed frame 72. The lifting component 71 is used to control the up and down movement of the feed frame 72. Specifically, the lifting component 71 can be a lifting piston cylinder.

[0121] like Figure 7 As shown, the axial drive component can adopt the following structure: including a feed motor 74 mounted on the feed frame 72 and a feed screw 75 rotatably connected to the feed frame 72. The feed motor 74 is connected to the feed screw 75 to drive the feed screw 75 to rotate, thereby driving the feed push plate 76 to move linearly along the axial direction of the feed screw 75. The feed push plate 76 and the feed screw 75 are connected to form a screw and nut pair.

[0122] In this embodiment, after the steel pipe except for the constricted section is cold-drawn, the lifting component 71 is first activated to drive the feeding frame 72 to move upward. Then, the steel pipe external clamping mechanism 43 is activated to release the clamp on the steel pipe, so that the steel pipe is supported on the receiving roller 73 on the feeding frame 72. Then, the feeding motor 74 in the axial drive component is activated to drive the feeding screw 75 to rotate, which in turn drives the feeding push plate 76 to move. The moving feeding push plate 76 pushes the front end of the steel pipe to move, so that the constricted section of the steel pipe enters the constricted section forming cavity 46.

[0123] It should be noted that when the steel pipe is not constricted, during the process of the inner support head 44 axially entering the steel pipe, the elastic element 442 is compressed and contracts, allowing the inner support head 44 to enter the steel pipe and support it. During this process, the inner support head 44 is subjected to the axial reaction force of the steel pipe under the action of the telescopic extrusion block 441. Since the force exerted by the elastic component 45 on the inner support head 44 is greater than the axial reaction force, the elastic component 45 does not contract. During the process of the steel pipe pushing component 6 pushing the steel pipe backward so that the constricted part passes through the outer pressure forming cavity 21 of the outer mold until the steel pipe is in the drawing and clamping position, or during the process of the steel pipe being pushed by the feed push plate 76, or during the process of the extrusion cone 36 on the cold drawing head 35 pushing the inner support head 44 to move, the elastic component 45 is compressed, thereby causing the inner support head 44 to move axially when the drawing moving seat 41 is stationary.

[0124] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A seamless steel pipe cold drawing device, characterized in that, include: Base; An outer wall forming assembly mounted on the base, the outer wall forming assembly including an outer mold having an external pressure forming cavity for forming the outer wall of the steel pipe during the steel pipe drawing and moving process; An inner wall forming assembly includes a cold-drawn mandrel component and a mandrel moving component. The mandrel moving component is mounted on the base and connected to the cold-drawn mandrel component to drive the cold-drawn mandrel component to move axially. The mandrel moving component includes a mandrel moving seat that is axially slidably connected to the base. The cold-drawn mandrel component includes a connecting shank and a cold-drawing head for forming the inner wall of the steel pipe during the steel pipe drawing process and is configured to cooperate with the outer mold for cold drawing the steel pipe. The cold-drawing head is connected to the front end of the connecting shank and the rear end of the connecting shank is connected to the mandrel moving seat. A drawing assembly suitable for drawing and moving steel pipes, the drawing assembly including a drawing moving seat, a drawing moving drive component, and an external clamping mechanism and an internal support head for steel pipes, both mounted on the drawing moving seat. The drawing moving seat is slidably disposed on the base. The drawing moving drive component is connected to the drawing moving seat to drive the drawing moving seat to move axially. The internal support head is adapted to move axially within the drawing moving seat and slide to connect with and support the front end of the connecting handle. A necking mechanism is mounted on the base, and the necking mechanism, the outer mold, and the drawing movable seat are arranged sequentially from front to back. A steel pipe pushing assembly, the steel pipe pushing assembly being adapted to push a steel pipe backward, the steel pipe having a constriction station and a drawing and clamping station in sequence during the backward pushing process; When the steel pipe is in the necking position, the cold drawing head is located inside the end of the steel pipe and the inner support head is located inside the end of the steel pipe and aligned with the necking mechanism. Then the necking mechanism is activated to neck the end of the steel pipe and hold it on the inner support head to form a necked part. When the steel pipe is in the drawing and clamping station, the outer wall of the constricted part of the steel pipe is clamped before drawing by the external clamping mechanism.

2. The seamless steel pipe cold drawing device according to claim 1, characterized in that, The external pressure forming cavity includes, from front to back, an opening with a gradually decreasing diameter and a forming part that connects to the opening.

3. The seamless steel pipe cold drawing device according to claim 1, characterized in that, The mandrel moving component also includes a mandrel moving motor and a mandrel moving screw. The mandrel moving screw is rotatably connected to the base, and the mandrel moving motor is mounted on the base. The mandrel moving motor is connected to the mandrel moving screw to drive the mandrel moving screw to rotate. The mandrel moving seat is connected to the mandrel moving screw to form a screw and nut pair.

4. The seamless steel pipe cold drawing device according to claim 1, characterized in that, The pulling and moving drive component includes a pulling and moving motor and a pulling and moving screw. The pulling and moving screw is rotatably connected to the base. The pulling and moving motor is mounted on the base and connected to the pulling and moving screw to drive the pulling and moving screw to rotate. The pulling and moving seat is connected to the pulling and moving screw to form a screw and nut pair.

5. The seamless steel pipe cold drawing device according to claim 1, characterized in that, The external clamping mechanism for the steel pipe includes: Mounting plate disposed on the pull-out movable seat; A bidirectional screw is rotatably connected to the mounting plate; Two clamping plates are connected to two oppositely arranged threads on the bidirectional screw and move toward each other to clamp the outer wall of the steel pipe or move away from each other to loosen the outer wall of the steel pipe when the bidirectional screw rotates. A clamping motor is connected to the bidirectional screw to drive the bidirectional screw to rotate, and the clamping motor is mounted on the mounting plate.

6. The seamless steel pipe cold drawing device according to claim 1, characterized in that, The inner support head is provided with a plurality of telescopic extrusion blocks along the circumferential direction. The telescopic extrusion blocks are adapted to move radially on the inner support head. An elastic element is provided between the telescopic extrusion blocks and the inner support head. The telescopic extrusion blocks are provided with inclined portions on both sides of the inner support head along the axial direction.

7. The seamless steel pipe cold drawing device according to claim 1, characterized in that, It also includes a steel pipe axial feed assembly; The drawing moving seat has a necking forming cavity for forming the outer wall of the necking part of the steel pipe. The diameter of the necking forming cavity is equal to the outer diameter of the cold-drawn steel pipe. An elastic component is provided between the inner support head and the pull-out moving seat to act on the inner support head to restore its axial position. The rear part of the cold drawing head is provided with an axially rearward extending extrusion cone; The steel pipe axial feeding assembly is adapted to feed the steel pipe axially after the steel pipe external clamping mechanism releases its grip on the steel pipe so that the entire constricted portion enters the constricted portion forming cavity. The external clamping mechanism for the steel pipe is also adapted to clamp the steel pipe after the entire constricted section has entered the constricted section forming cavity. The cold drawing head is also adapted to move backward after the entire constricted portion has entered the constricted portion forming cavity and the steel pipe is clamped by the external clamping mechanism, so as to cooperate with the constricted portion forming cavity to form the constricted portion.

8. The seamless steel pipe cold drawing device according to claim 1, characterized in that, The inner ring of the inner support head is rotatably connected to a rotating ring, and the connecting handle is axially slidably connected to and supported on the rotating ring. The drawing assembly also includes a steel pipe rotation drive mechanism connected to the outer clamping mechanism and the inner support head to drive the outer clamping mechanism and the inner support head to rotate, thereby causing the steel pipe connected thereto to rotate.

9. The seamless steel pipe cold drawing device according to claim 8, characterized in that, The steel pipe rotation drive mechanism includes: A steel pipe rotary motor mounted on the pulling movable seat; Rotatably connected to the pulling movable seat; A first driving gear and a second driving gear are connected to the connecting rod; A first driven gear meshes with the first driving gear, and the first driven gear is connected to the steel pipe external clamping mechanism; A second driven gear meshes with the second driving gear, and the second driven gear is connected to the inner support head; wherein... Both the first driven gear and the second driven gear are rotatably connected to the pull-out moving seat.

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