A mandrel extraction device for cold-drawn steel pipe male end

Abstract

This utility model discloses a core-pulling device for cold-drawn steel pipe male ends, comprising a sliding base slidably connected to the right side of the top of a cold-drawing machine tool; a drawing die is fixedly installed on the left side of the top of the cold-drawing machine tool, and an inner core die is arranged on the right side of the top of the cold-drawing machine tool; a pulling assembly is arranged in the inner cavity of the sliding base, the pulling assembly including three transmission columns rotatably connected to the inner cavity of the sliding base, transmission wheels fixedly connected to the surface of the transmission columns, a liftable lifting frame arranged above the transmission wheels, a pressing wheel rotatably connected to the inner cavity of the lifting frame, and three threaded operating rods penetrating the top of the sliding base. This utility model, through the coordinated use of the sliding base, the pulling assembly, and the driving assembly, automatically advances and pulls the inner core die; simultaneously, with the cooperation of the locking assembly, the inner core die is limited and locked after being positioned, thus achieving the purpose of automatic core-pulling and stable and reliable positioning.

Description

Technical Field

[0001] This utility model belongs to the field of cold drawing technology, and in particular relates to a core-pulling device for cold-drawn steel pipe male ends. Background Technology

[0002] Drawing is a metal pressure processing technology that applies tensile force to metal materials (mainly metal tubes, bars, and wires) at room temperature, causing them to pass through a mold of a specific shape and size, thereby deforming the material to change its shape, size, and improve its properties. It utilizes the plasticity of metals at room temperature, and under tensile force, the lattice structure between metal atoms undergoes slippage and rearrangement.

[0003] In the production process of cold-drawn steel pipes, the male end mandrel extraction has a significant impact on the forming quality, dimensional accuracy, and production efficiency of the steel pipe. However, manually inserting the inner core mold into the steel pipe and then manually removing it after the steel pipe is drawn is extremely labor-intensive. The insertion position and depth of the inner core mold may be inaccurate, resulting in uneven stress on the steel pipe during the drawing process. This affects the dimensional accuracy and surface quality of the steel pipe, and can easily lead to problems such as uneven wall thickness and rough surface. Therefore, it is necessary to provide a male end mandrel extraction device for cold-drawn steel pipes. Utility Model Content

[0004] The purpose of this utility model is to provide a core-pulling device for cold-drawn steel pipe male ends, which adopts an automatic push-lock and core-pulling structure to ensure that the inner core mold is in place stably and reliably. The components work together and have a high degree of automation, so as to solve the above-mentioned technical problems.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A core-drawing device for male cold-drawn steel pipes includes a sliding base slidably connected to the right side of the top of a cold-drawing machine tool; a drawing die is fixedly installed on the left side of the top of the cold-drawing machine tool, and an inner core die is provided on the right side of the top of the cold-drawing machine tool; a pulling assembly is provided in the inner cavity of the sliding base; the pulling assembly includes three transmission columns rotatably connected to the inner cavity of the sliding base; transmission wheels are fixedly connected to the surface of the transmission columns; a liftable lifting frame is provided above the transmission wheels; and a pressing wheel is rotatably connected to the inner cavity of the lifting frame. Three threaded operating rods are provided through the top of the sliding base. The bottom end of the threaded operating rods passes through the inner cavity of the sliding base and is rotatably connected to the lifting frame through bearings. A drive assembly is provided on the rear side of the sliding base. The drive assembly includes a servo motor fixedly installed on the rear side of the sliding base. The output shaft of the servo motor is fixedly connected to a drive gear. The drive gear is fixedly connected to the transmission column located on the left side. The rear ends of the two transmission columns located on the right side pass through the rear side of the sliding base and are fixedly connected to a force-bearing gear. A locking assembly is provided on the right side of the sliding base.

[0006] Preferably, the rear side of the sliding base is rotatably connected to a plurality of transmission gears, and the transmission gears simultaneously mesh with two adjacent force-bearing gears.

[0007] Preferably, the locking assembly includes a limiting plate slidably connected to the right side of the drawing die, a telescopic cylinder is fixedly installed on the right side of the drawing die, and two limiting discs are fixedly connected to the right side of the inner core die surface, with the limiting plate inserted between the two limiting discs.

[0008] Preferably, the front and rear ends of the right side of the drawing die are fixedly connected to a fixing sleeve, the front and rear sides of the top of the limiting plate are fixedly connected to a limiting slide rod, the limiting slide rod is slidably connected to the inner cavity of the fixing sleeve, and the bottom of the right side of the sliding base is fixedly connected to a limiting frame.

[0009] Preferably, the front and rear sides of the lifting frame are fixedly connected to limiting slide plates, and the top of the front and rear sides of the sliding base are provided with limiting slide grooves, and the limiting slide plates are slidably connected to the inner cavity of the limiting slide grooves.

[0010] Preferably, two hydraulic cylinders are fixedly installed on the right side of the top of the cold drawing machine tool, and the output end of the hydraulic cylinders is fixedly connected to the sliding base.

[0011] The beneficial effects of this utility model are:

[0012] 1. This utility model uses the sliding base, the pull-out component and the drive component together to automatically push and pull out the inner core mold. At the same time, with the help of the locking component, the inner core mold is limited and locked after it is in place, so as to achieve the purpose of automatic pushing and pulling and stable and reliable placement.

[0013] 2. This utility model, through the setting of the locking component, wherein the inner core mold is limited and locked by the driving of the telescopic cylinder and the cooperation of the limiting insert plate and the limiting plate, so that the inner core mold remains stable during the cold drawing process. At the same time, the limiting insert plate is limited and guided by the cooperation of the fixing sleeve and the limiting slide rod, thereby improving the stability of the limiting insert plate during the sliding process.

[0014] 3. This utility model uses the combination of limiting slide plate and limiting slide groove to limit and guide the lifting frame, thereby improving the stability of the lifting frame during the lifting process and ensuring that the extrusion wheel can be stably pressed onto the surface of the steel pipe. Attached Figure Description

[0015] in:

[0016] Figure 1 This is a top view schematic diagram of one embodiment of the present utility model;

[0017] Figure 2This is one embodiment of the present utility model. Figure 2 A magnified view of point A in the middle;

[0018] Figure 3 This is a perspective view of a sliding base, a pull-out assembly, and a driving assembly according to an embodiment of the present invention;

[0019] Figure 4 This is an exploded perspective view of the inner core mold and locking assembly of one embodiment of the present invention.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Cold drawing machine tool; 2. Sliding base; 3. Drawing die; 4. Inner core die; 5. Pull-out assembly; 51. Transmission column; 52. Transmission wheel; 53. Lifting frame; 54. Extrusion wheel; 55. Threaded operating rod; 6. Drive assembly; 61. Servo motor; 62. Drive gear; 63. Force-bearing gear; 64. Transmission gear; 7. Locking assembly; 71. Limiting plate; 72. Telescopic cylinder; 73. Limiting disc; 74. Fixing sleeve; 75. Limiting slide bar; 76. Limiting frame; 8. Limiting slide plate; 9. Limiting slide groove; 10. Hydraulic cylinder. Detailed Implementation

[0022] In the following description, embodiments of the cold-drawn steel pipe male end core-pulling device of the present invention will be described with reference to the accompanying drawings.

[0023] Figure 1-4This invention illustrates a cold-drawn steel pipe male end drawing device according to an embodiment of the present invention. It includes a sliding base 2 slidably connected to the right side of the top of a cold-drawing machine tool 1. It should be noted that the cold-drawing machine tool 1 is a mechanical device used for cold-drawing metal pipes and plays an important role in the metal processing field. Its working principle is that, under normal temperature conditions, a tensile force is applied to the metal pipe through a die, causing the pipe to pass through a die of a specific shape, thereby reducing the pipe's diameter, wall thickness, or changing its cross-sectional shape to meet the requirements of different industrial fields for pipe size, precision, and performance. As this is an existing technology, it will not be elaborated upon further. A drawing die 3 is fixedly installed on the left side of the top of the cold-drawing machine tool 1, and two hydraulic cylinders 10 are fixedly installed on the right side of the top of the cold-drawing machine tool 1. The output end of the hydraulic cylinder 10 is fixedly connected to the sliding base 2. An inner core mold 4 is located on the right side of the top of the cold drawing machine tool 1. A pull-out assembly 5 is located within the inner cavity of the sliding base 2. The pull-out assembly 5 includes three transmission columns 51 rotatably connected to the inner cavity of the sliding base 2. Transmission wheels 52 are fixedly connected to the surface of each transmission column 51. A liftable lifting frame 53 is located above the transmission wheels 52. Limiting slide plates 8 are fixedly connected to the front and rear sides of the lifting frame 53. Limiting grooves 9 are formed on the top of the front and rear sides of the sliding base 2. The limiting slide plates 8 are slidably connected to the inner cavity of the limiting grooves 9. Through the combined use of the limiting slide plates 8 and the limiting grooves 9, the lifting frame 53 is limited and guided, thereby improving the lifting frame 53's performance during the lifting process. To ensure stability, the extrusion roller 54 is able to press stably against the steel pipe surface. The extrusion roller 54 is rotatably connected to the inner cavity of the lifting frame 53. Three threaded operating rods 55 are installed through the top of the sliding base 2. The bottom ends of the threaded operating rods 55 penetrate into the inner cavity of the sliding base 2 and are rotatably connected to the lifting frame 53 through bearings. A drive assembly 6 is provided on the rear side of the sliding base 2. The drive assembly 6 includes a servo motor 61 fixedly installed on the rear side of the sliding base 2. The output shaft of the servo motor 61 is fixedly connected to a drive gear 62. The drive gear 62 is fixedly connected to the transmission column 51 located on the left side. The rear ends of the two transmission columns 51 located on the right side penetrate into the rear side of the sliding base 2 and are fixedly connected to a force-bearing gear 63. The rear side of the sliding base 2 is rotatably connected to... There are multiple transmission gears 64, which simultaneously mesh with two adjacent force-bearing gears 63. A locking assembly 7 is provided on the right side of the sliding base 2. The locking assembly 7 includes a limiting plate 71 slidably connected to the right side of the drawing die 3. A telescopic cylinder 72 is fixedly installed on the right side of the drawing die 3. Two limiting discs 73 are fixedly connected to the right side of the inner core die 4 surface. The limiting plate 71 is inserted between the two limiting discs 73. The front and rear ends of the right side of the drawing die 3 are fixedly connected to fixing sleeves 74. The front and rear sides of the top of the limiting plate 71 are fixedly connected to limiting slide rods 75, which are slidably connected to the inner cavity of the fixing sleeves 74. A limiting frame 76 is fixedly connected to the bottom of the right side of the sliding base 2. Through the setting of the locking assembly 7,The telescopic cylinder 72, in conjunction with the limiting plate 71 and the limiting disk 73, effectively limits and locks the inner core mold 4, ensuring its stability during cold drawing. Simultaneously, the fixed sleeve 74 and the limiting slide rod 75 guide and limit the limiting plate 71, thereby improving its stability during sliding.

[0024] Working Principle: In use, the user places the steel pipe on top of the cold drawing machine 1, and the cylinder passes the drawing end of the steel pipe through the inner cavity of the drawing die 3. Then, the user activates the hydraulic cylinder 10, which pulls the sliding base 2 forward, causing the sliding base 2 to shift forward and align the inner core die 4 with the steel pipe on the same axis. The user then activates the servo motor 61, which starts and drives the drive gear 62 to rotate. During rotation, the drive gear 62, through the meshing transmission of the transmission gear 64, drives the force-bearing gear 63 to rotate. The force-bearing gear 63, during rotation, drives the transmission wheel 52 to rotate through the transmission column 51. Simultaneously, under the pressing action of the extrusion wheel 54, the inner core die is pressed... Friction transmission is performed by tool 4, which allows the inner core mold 4 to enter the inner cavity of the steel pipe and reach the inner cavity of the drawing mold 3. Then, the telescopic cylinder 72 is opened and pushes the limiting plate 71, which slides downward and engages between the two limiting discs 73 and is inserted into the inner cavity of the limiting frame 76, thus limiting and locking the inner core mold 4. Then, the steel pipe is drawn by the setting of the cold drawing machine tool 1, so that the steel pipe is drawn and shaped under the cooperation of the drawing mold 3 and the inner core mold 4. Finally, the telescopic cylinder 72 drives the limiting plate 71 to rise and reset, releasing the lock on the inner core mold 4. Finally, the servo motor 61 rotates in reverse and drives the transmission column 51 and the transmission wheel 52 to rotate in reverse, which frictionally drives the inner core mold 4 to the right for extraction.

[0025] In summary, this cold-drawn steel pipe male core pulling device, through the coordinated use of the sliding base 2, the pulling component 5, and the driving component 6, automatically pushes and pulls the inner core mold 4. At the same time, with the cooperation of the locking component 7, the inner core mold 4 is limited and locked after it is in place, thus achieving the purpose of automatic core pulling and stable and reliable positioning.

Claims

1. A male core-pulling device for a cold-drawn steel pipe, characterized by comprising: The system includes a sliding base (2) slidably connected to the right side of the top of a cold drawing machine (1); a drawing die (3) is fixedly installed on the left side of the top of the cold drawing machine (1); an inner core die (4) is provided on the right side of the top of the cold drawing machine (1); a drawing assembly (5) is provided in the inner cavity of the sliding base (2); the drawing assembly (5) includes three transmission columns (51) rotatably connected to the inner cavity of the sliding base (2); transmission wheels (52) are fixedly connected to the surface of the transmission columns (51); a liftable lifting frame (53) is provided above the transmission wheels (52); an extrusion wheel (54) is rotatably connected to the inner cavity of the lifting frame (53); and three threaded operating rods are provided through the top of the sliding base (2). The bottom end of the threaded operating rod (55) passes through the inner cavity of the sliding base (2) and is rotatably connected to the lifting frame (53) through a bearing. A drive assembly (6) is provided on the rear side of the sliding base (2). The drive assembly (6) includes a servo motor (61) fixedly installed on the rear side of the sliding base (2). The output shaft of the servo motor (61) is fixedly connected to a drive gear (62). The drive gear (62) is fixedly connected to the transmission column (51) located on the left side. The rear ends of the two transmission columns (51) located on the right side pass through the rear side of the sliding base (2) and are fixedly connected to a force-bearing gear (63). A locking assembly (7) is provided on the right side of the sliding base (2).

2. A male core extractor for cold drawn steel tubes according to claim 1, characterized in that, The rear side of the sliding base (2) is rotatably connected to a plurality of transmission gears (64), and the transmission gears (64) mesh with two adjacent force-bearing gears (63) at the same time.

3. A male core extractor for cold drawn steel tubes according to claim 2, characterized in that, The locking assembly (7) includes a limiting plate (71) slidably connected to the right side of the drawing die (3), a telescopic cylinder (72) is fixedly installed on the right side of the drawing die (3), and two limiting discs (73) are fixedly connected to the right side of the inner core die (4), with the limiting plate (71) inserted between the two limiting discs (73).

4. A male core extractor for cold drawn steel tubes according to claim 3, characterized in that, The front and rear ends of the right side of the drawing die (3) are fixedly connected to a fixed sleeve (74), and the front and rear sides of the top of the limiting plate (71) are fixedly connected to a limiting slide rod (75). The limiting slide rod (75) is slidably connected to the inner cavity of the fixed sleeve (74), and the bottom of the right side of the sliding base (2) is fixedly connected to a limiting frame (76).

5. A male core extractor for cold drawn steel tubes according to claim 4, characterized in that, The lifting frame (53) is fixedly connected to the front and rear sides of the limiting slide plate (8), and the top of the front and rear sides of the sliding base (2) is provided with the limiting slide groove (9), and the limiting slide plate (8) is slidably connected to the inner cavity of the limiting slide groove (9).

6. A male core extractor for cold drawn steel tubes according to claim 5, characterized in that, Two hydraulic cylinders (10) are fixedly installed on the right side of the top of the cold drawing machine tool (1), and the output end of the hydraulic cylinder (10) is fixedly connected to the sliding base (2).

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