A cold-drawing device for seamless steel pipe production

Abstract

This invention relates to the field of equipment for manufacturing metal tubes by drawing, specifically to a cold drawing apparatus for producing seamless steel tubes. The apparatus includes, from front to back, a support assembly for supporting the seamless steel tube, a forming unit for shaping the seamless steel tube, and a drawing unit for drawing the seamless steel tube. A clamping and feeding unit, with adjustable spacing, is provided between the support assembly and the forming unit for feeding the seamless steel tube from the support assembly into the forming unit. The forming unit includes a pretreatment mold and a cold drawing mold that can slide left and right. The cold drawing mold includes a shell, with an oil cavity formed between the interior of the shell and an inner mold. The inner mold has a ring-shaped cylindrical structure, and oil holes for lubricating oil are provided on both the inner and outer sidewalls of the inner mold. Existing cold drawing apparatuses suffer from low efficiency; the cold drawing apparatus for producing seamless steel tubes provided by this invention has higher efficiency.

Description

Technical Field

[0001] This invention relates to the field of equipment for manufacturing metal tubes by drawing, and more specifically to a cold drawing apparatus for producing seamless steel tubes. Background Technology

[0002] Cold drawing is a type of cold working, which involves forcibly shaping metal at room temperature using force. In the production of seamless steel pipes, a cold drawing device is used to elongate the pipe. Before cold drawing, the pipe, conforming to specifications, is typically pre-treated in a rotating pre-treatment device. This pre-treatment involves thinning the front end of the pipe to allow it to fit into the small-diameter mold of the cold drawing device. After pre-treatment, lubricant is applied to the surface of the pipe to prevent hard tearing during the cold drawing process. The thinned end is then inserted into the mold, and a drawing carriage grasps the end protruding from the mold, pulling it outwards. After cold drawing, the thinned end is sawed off, and the pipe is then sent to a degreasing device. During the production process described above, the horizontal tension extends the length of the seamless steel pipe, while the vertical pressure exerted by the mold on the seamless steel pipe reduces its cross-sectional area. Meanwhile, the friction between the seamless steel pipe and the mold removes the oxides from the surface of the seamless steel pipe.

[0003] It is evident that using existing cold drawing equipment for seamless steel pipes requires both pretreatment and cold drawing devices. The seamless steel pipes need to be moved and transferred during operation, making the process cumbersome and resulting in low cold drawing efficiency. Furthermore, applying lubricant is done by workers, which is time-consuming and the application is not precise, further reducing cold drawing efficiency and potentially affecting product accuracy.

[0004] Therefore, existing cold drawing devices suffer from low efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a cold drawing device for producing seamless steel pipes with higher efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides a cold drawing device for seamless steel pipe production, comprising, from front to back, a support assembly for supporting the seamless steel pipe, a forming unit for shaping the seamless steel pipe, and a drawing unit for drawing the seamless steel pipe. A clamping and feeding unit with adjustable spacing is provided between the support assembly and the forming unit for feeding the seamless steel pipe from the support assembly into the forming unit. The forming unit includes a frame, in which a pretreatment mold for thinning the front end of the seamless steel pipe and a cold drawing mold, both capable of sliding left and right, are detachably mounted. The pretreatment mold and the cold drawing mold are detachably connected. The forming unit also includes a device for driving the pretreatment mold. The device includes a first telescopic component that slides with the cold drawing die; the cold drawing die includes a hollow cylindrical outer shell, with an installation hole at the center of the outer shell for installing an inner die for cold drawing seamless steel pipes, and an oil cavity formed between the interior of the outer shell and the inner die; the inner die has an annular cylindrical structure, with oil holes for lubricating oil to pass through on both the inner and outer walls of the inner die, and the oil holes on the inner and outer walls are connected by an oil passage, and an oil pipe for supplying lubricating oil into the outer shell is installed on the top of the outer shell; the drawing unit includes a drawing carriage for drawing seamless steel pipes that can slide back and forth, an installation groove for the drawing carriage to slide back and forth, and a drive assembly for driving the drawing carriage to slide. By integrating the pretreatment device and the cold drawing die through a sliding pretreatment die and a cold drawing die, the seamless steel pipe does not need to be transferred to the cold drawing device after pretreatment, reducing the number of processes, greatly reducing the difficulty of operation, and improving the efficiency of the device. At the same time, through the cooperation of oil holes and oil pipes on the inner mold of the cold drawing die, the device can automatically apply lubricating oil to the surface of the seamless steel pipe when it enters the cold drawing die, eliminating the need for workers to apply oil or for an oiling device to apply oil, shortening the time and improving efficiency.

[0007] As a further improvement of the present invention: the support assembly includes a base plate, on which multiple first vertical plates are vertically mounted at equal intervals from front to back. Each first vertical plate has a U-shaped groove at its top, and a U-shaped plate is installed in each U-shaped groove. The support assembly has a simple structure, and the seamless steel pipe can slide within each U-shaped plate.

[0008] As a further improvement of the present invention: the clamping and feeding unit includes a left feeding assembly and a right feeding assembly symmetrically arranged on the left and right sides; both the left and right feeding assemblies include a U-shaped plate that can slide left and right and a second telescopic member for driving the U-shaped plate to slide; the U-shaped plate includes a second vertical plate and first flat plates respectively vertically installed on the upper and lower sides of the second vertical plate, and an upper connecting plate and a lower connecting plate arranged vertically on the front of the second vertical plate, with a first rotating shaft rotatably installed between the upper and lower connecting plates, and a feeding roller for driving the seamless steel pipe to move is fixedly sleeved on the outside of the first rotating shaft; a first motor for driving the first rotating shaft to rotate is installed on the top of the upper connecting plate in the right feeding assembly, and the first rotating shaft in the left feeding assembly and the first rotating shaft in the right feeding assembly are connected by a first transmission member. Preferably, the lower end of the first rotating shaft extends through the lower connecting plate from the lower side of the lower connecting plate, a first gear is fixedly installed on the extended part of the first rotating shaft in the left feeding assembly, and a second gear meshing with the first gear is fixedly installed on the extended part of the first rotating shaft in the right feeding assembly. Preferably, the second telescopic component is fixedly installed on the inner left and inner right walls of the frame, and the top of the telescopic end of the second telescopic component is fixedly connected to the U-shaped plate located on the same side. The seamless steel pipe can be moved forward or backward by the feeding roller to cooperate with the forming unit.

[0009] As a further improvement of the present invention: the pretreatment mold includes a fixed frame and an annular column rotatably mounted in the fixed frame. A gear ring is fixedly sleeved on the outer surface of the annular column, and the center point of the annular column coincides with that of the gear ring. A fourth motor is mounted on the top of the fixed frame, and a third gear meshing with the gear ring is fixedly mounted on the output shaft of the fourth motor. Three extrusion rollers for extruding and thinning the front end of the seamless steel pipe are equidistantly arranged circumferentially on the inner surface of the annular column. The cold drawing mold also includes a fixed frame for mounting the outer shell. Preferably, the fixed frame includes two parallel square plates, which are fixedly connected by four connecting rods.

[0010] As a further improvement of the present invention: the drawing trolley includes a trolley body and a first L-shaped clamping arm and a second L-shaped clamping arm installed in the trolley body for clamping seamless steel pipes with adjustable clamping distance; a forward and reverse threaded ball screw is rotatably mounted in the trolley body, and a second motor is mounted on the trolley body for driving the forward and reverse threaded ball screw to rotate; a right-handed screw nut is installed on one side of the forward and reverse threaded ball screw, and a left-handed screw nut is installed on the other side; the right-handed screw nut is fixedly connected to the bottom of the first L-shaped clamping arm, and the left-handed screw nut is fixedly connected to the bottom of the second L-shaped clamping arm. Preferably, a positioning pin is installed on the front side of the trolley body for positioning when inserting into the thinner end of the seamless steel pipe.

[0011] As a further improvement of the present invention: the drive assembly includes a ball screw rotatably mounted in the mounting groove, the central axis of the ball screw being parallel to the central axis of the seamless steel pipe; a third motor for driving the ball screw to rotate is mounted at the end of the mounting groove away from the forming unit, a screw nut is mounted on the ball screw, and the screw nut is fixedly connected to the bottom of the pulling carriage.

[0012] The beneficial effects of this invention are as follows: The cold drawing device for seamless steel pipe production provided by this invention has high efficiency. The device has a pretreatment mold and a cold drawing mold that can slide left and right within a frame. By sliding the pretreatment mold and the cold drawing mold left and right, they are aligned with the support assembly and the drawing unit, respectively. With the cooperation of the clamping and feeding unit, the pretreatment and cold drawing of the seamless steel pipe can be achieved on this device, eliminating the need to transport and transfer the seamless steel pipe for other processes, simplifying operation and greatly improving efficiency. Simultaneously, the inner mold of the cold drawing mold has oil holes, and the outer shell is equipped with oil pipes. Through the cooperation of the oil pipes, oil chambers, and oil holes, the device can lubricate the surface of the seamless steel pipe with oil as it passes through the inside of the cold drawing mold. This eliminates the need for workers to manually oil the seamless steel pipe, reducing time consumption and ensuring a relatively fixed amount of oil, thus greatly improving efficiency. Therefore, this device has high efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the overall structure of the invention and the seamless steel pipe;

[0015] Figure 3 This is a top view of the present invention;

[0016] Figure 4 This is a schematic diagram of the overall structure of a seamless steel pipe;

[0017] Figure 5 This is a schematic diagram of the overall structure of the frame in this invention;

[0018] Figure 6 This is a schematic diagram of the overall structure of the frame and the feeding clamping unit in this invention;

[0019] Figure 7 This is a schematic diagram of the overall structure of the feeding clamping unit in this invention;

[0020] Figure 8 This is a schematic diagram of the overall structure of the molding unit in this invention;

[0021] Figure 9 This is a schematic diagram of the overall structure of the molding unit from another angle in this invention;

[0022] Figure 10This is a schematic diagram of the overall structure of the molding unit without the frame in this invention;

[0023] Figure 11 This is a partial structural schematic diagram of the molding unit in this invention;

[0024] Figure 12 This is a schematic diagram of the overall structure of the fixing frame and the protruding column in this invention;

[0025] Figure 13 This is a schematic diagram of the overall structure of the pretreatment mold in this invention;

[0026] Figure 14 This is a schematic diagram of the overall structure of the annular column and the extrusion roller in this invention;

[0027] Figure 15 This is a schematic diagram of the overall structure of the extrusion roller in this invention;

[0028] Figure 16 This is a schematic diagram of the overall structure of the fixing frame in this invention;

[0029] Figure 17 This is a schematic diagram of the overall structure of the fixing frame from another angle in this invention;

[0030] Figure 18 This is a schematic diagram of the overall structure of the cold drawing die in this invention;

[0031] Figure 19 This is a schematic diagram of the overall structure of the outer shell in this invention;

[0032] Figure 20 This is a perspective view of the overall structure of the inner mold in this invention;

[0033] Figure 21 This is a schematic diagram of the overall structure of the pulling unit and the driving assembly in this invention;

[0034] Figure 22 This is a partial structural diagram of the pulling unit and driving assembly in this invention.

[0035] Figure 23 This is a schematic diagram of the overall structure of the vehicle body in this invention;

[0036] Figure 24 This is a schematic diagram of the overall structure of the first L-shaped clamping arm in this invention;

[0037] The names of the components corresponding to the markings in the above figures are: 1. Seamless steel pipe;

[0038] 2. Support components; 201. Base plate; 202. First vertical plate; 203. U-shaped plate;

[0039] 3A. Left feeding assembly; 3B. Right feeding assembly; 301. Feeding roller; 302. U-shaped plate; 303A. Upper connecting plate; 303B. Lower connecting plate; 304. First rotating shaft; 305. First motor; 306. Second telescopic component; 307. First gear; 308. Second gear;

[0040] 4. Pre-treatment mold; 401. Annular column; 402. Gear ring; 403. Fourth motor; 404. Third gear; 405. Extrusion roller; 406. Protruding column;

[0041] 5. Cold drawing die; 501. Outer shell; 502. Inner mold; 503. Oil hole; 504. Oil pipe;

[0042] 6. First telescopic component;

[0043] 7. Pulling trolley; 701. Car body; 702. Forward and reverse toothed ball screw; 703. Second motor; 704. First L-shaped clamping arm; 705. Second L-shaped clamping arm; 706. Positioning pin;

[0044] 8. Mounting bracket;

[0045] 9. Drive assembly; 901. Mounting slot; 902. Ball screw; 903. Third motor; 904. Screw nut;

[0046] 10. Framework. Detailed Implementation

[0047] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0048] Definitions of relevant terms used in this invention:

[0049] (1) In this invention, the directional terms such as "up", "down", "left", "right", "front", "back", "top", and "bottom" are all in the form of... Figure 3 The defined direction serves as the reference.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the present invention provides a cold drawing device for seamless steel pipe production, comprising, from front to back, a support assembly 2 for supporting a seamless steel pipe 1, a forming unit for forming the seamless steel pipe 1, and a drawing unit for drawing the seamless steel pipe 1. A clamping and feeding unit, with adjustable spacing, is provided between the support assembly 2 and the forming unit for feeding the seamless steel pipe 1 from the support assembly 2 into the forming unit. The support assembly 2 includes a base plate 201, on which a plurality of first vertical plates 202 are vertically mounted at equal intervals from front to back. Each first vertical plate 202 has a U-shaped groove at its top, and a U-shaped plate 203 is installed in each U-shaped groove. The U-shaped plate 203 increases the contact area between the support assembly 2 and the seamless steel pipe 1. The device also includes a main controller, which is connected to a first motor 305, a second telescopic component 306, a fourth motor 403, a first telescopic component 6, a second motor 703, a third motor 903, and a pressure sensor. Both the second telescopic component 306 and the first telescopic component 6 are pneumatic cylinders, hydraulic cylinders, or electric push rods.

[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, the forming unit includes a frame 10. A pretreatment mold 4, capable of sliding left and right, for thinning the front end of the seamless steel pipe 1, and a cold drawing mold 5, also capable of sliding left and right, for cold drawing the seamless steel pipe 1, are detachably mounted in the frame 10. The pretreatment mold 4 and the cold drawing mold 5 are detachably connected. The forming unit also includes a second slide rail installed in the frame 10 for the left and right sliding of the pretreatment mold 4 and the cold drawing mold 5, and a first telescopic member 6 for driving the sliding of the pretreatment mold 4 and the cold drawing mold 5. A second slider is detachably mounted on the bottom of both the pretreatment mold 4 and the cold drawing mold 5. A driving plate is fixedly mounted on the top of the telescopic end of the first telescopic member 6. The driving plate is fixedly connected to the second slider at the bottom of the cold drawing mold 5. The left and right sliding of the driving plate is achieved by changing the length of the telescopic end of the first telescopic member 6, thereby driving the pretreatment mold 4 and the cold drawing mold 5 to slide.

[0052] like Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15As shown, the pretreatment mold 4 includes a fixed frame 8 and an annular column 401 rotatably mounted in the fixed frame 8. The fixed frame 8 includes two parallel square plates, which are fixedly connected by four connecting rods. Each square plate has a guide hole at its center corresponding to the forming holes of the two molds. On opposite sides of the two square plates of the pretreatment mold 4, multiple protrusions 406 are arranged circumferentially around their center points. The annular column 401 has annular grooves on both its front and back sides that allow it to rotate around the protrusions 406. A first snap-fit ​​block is fixedly mounted on the right side of the fixed frame 8 of the pretreatment mold 4, and a second snap-fit ​​block that can snap into the first snap-fit ​​block is fixedly mounted on the left side of the fixed frame 8 of the cold drawing mold 5. After the second snap-fit ​​block snaps into the first snap-fit ​​block, it is further connected by bolts. A toothed ring 402 is fixedly sleeved on the outer surface of the annular column 401. An annular groove for mounting the toothed ring 402 is formed on the outer surface of the annular column 401, and the toothed ring 402 is fixedly mounted in the annular groove. The center point of the annular column 401 coincides with that of the gear ring 402. A fourth motor 403 is installed on the top of the fixed frame 8. A third gear 404 that meshes with the gear ring 402 is fixedly installed on the output shaft of the fourth motor 403. Three extrusion rollers 405 for extruding and thinning the front end of the seamless steel pipe 1 are equidistantly arranged on the inner surface of the annular column 401. Each extrusion roller 405 includes a roller frame and an extrusion roller rotatably installed in the roller frame. The diameter of the extrusion roller gradually increases from front to back. The narrower part of the extrusion roller has a frustum-shaped structure with its outer surface concave inward, and the larger part of the extrusion roller has a frustum-shaped structure with its outer surface convex outward.

[0053] like Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown, the cold drawing die 5 includes a hollow cylindrical outer shell 501. An mounting hole is provided at the center of the outer shell 501 for installing an inner mold 502 used to cold draw the seamless steel pipe 1. An oil cavity is formed between the interior of the outer shell 501 and the inner mold 502. The inner mold 502 has an annular cylindrical structure. Oil holes 503 for lubricating oil are provided on both the inner and outer walls of the inner mold 502. The oil holes 503 on the inner and outer walls are connected by an oil passage. An oil pipe 504 for supplying lubricating oil into the outer shell 501 is installed on the top of the outer shell 501. One end of the oil pipe 504 away from the outer shell 501 is connected to an external oil tank containing lubricating oil. The cold drawing die 5 also includes a mounting bracket 8 for installing the outer shell 501.

[0054] like Figure 1 , Figure 2 , Figure 3 , Figure 21 , Figure 22 , Figure 23 , Figure 24 As shown, the drawing unit includes a drawing carriage 7 capable of sliding back and forth for drawing seamless steel pipe 1, a mounting groove 901 for the drawing carriage 7 to slide back and forth, and a drive assembly 9 for driving the drawing carriage 7 to slide. Third sliders are mounted on both the left and right sides of the bottom of the drawing carriage 7, and a third slide rail matching the third slider is provided on the top of the mounting groove 901 for the third slider to slide on. The drawing carriage 7 includes a carriage body 701 and a first L-shaped clamping arm 704 and a second L-shaped clamping arm 705 installed inside the carriage body 701 for clamping one end of the seamless steel pipe 1 extending from the cold drawing die 5, with an adjustable clamping distance. Both the first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 have arc-shaped grooves on the surfaces that contact the seamless steel pipe 1, and the arc-shaped grooves are provided with textures to enhance friction. A forward and reverse thread ball screw 702 is rotatably mounted in the carriage body 701, and a second motor 703 is mounted on the carriage body 701 to drive the forward and reverse thread ball screw 702 to rotate. A right-hand screw nut is installed on one side of the forward and reverse thread ball screw 702, and a left-hand screw nut is installed on the other side. The right-hand screw nut is fixedly connected to the bottom of the first L-shaped clamping arm 704, and the left-hand screw nut is fixedly connected to the bottom of the second L-shaped clamping arm 705. A positioning pin 706 is installed on the front side of the carriage 701 for positioning the thinner end of the seamless steel tube 1. The drive assembly 9 includes a mounting groove 901 with a U-shaped cross-section. A ball screw 902 is rotatably mounted in the mounting groove 901, and the central axis of the ball screw 902 is parallel to the central axis of the seamless steel tube 1. A third motor 903 for driving the ball screw 902 to rotate is installed at the end of the mounting groove 901 away from the forming unit. A screw nut 904 is installed on the ball screw 902, and the screw nut 904 is fixedly connected to the bottom of the carriage 701 of the pulling carriage 7.

[0055] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7As shown, the clamping and feeding unit includes a left feeding assembly 3A and a right feeding assembly 3B symmetrically arranged. Both the left feeding assembly 3A and the right feeding assembly 3B include a U-shaped plate 302 capable of sliding left and right, and a second telescopic member 306 for driving the U-shaped plate 302 to slide. The U-shaped plate 302 includes a second vertical plate and first flat plates respectively vertically installed on the upper and lower sides of the second vertical plate. An upper connecting plate 303A and a lower connecting plate 303B, arranged vertically, are vertically installed on the front of the second vertical plate, with a gap between the upper connecting plate 303A and the lower connecting plate 303B. A first rotating shaft 304 is rotatably mounted between the upper connecting plate 303A and the lower connecting plate 303B at a certain distance. A feeding roller 301 for moving the seamless steel pipe 1 is fixedly sleeved on the outside of the first rotating shaft 304. The surface of the feeding roller 301 has textures to increase friction. A first motor 305 for driving the first rotating shaft 304 to rotate is mounted on the top of the upper connecting plate 303A in the right feeding assembly 3B. The first rotating shaft 304 in the left feeding assembly 3A and the first rotating shaft 304 in the right feeding assembly 3B are connected by a first transmission component. The lower ends of the first rotating shafts 304 all pass through the lower connecting plate 303B and extend from the lower side of the lower connecting plate 303B. A first gear 307 is fixedly mounted on the extended part of the first rotating shaft 304 in the left feeding assembly 3A, and a second gear 308 that meshes with the first gear 307 is fixedly mounted on the extended part of the first rotating shaft 304 in the right feeding assembly 3B. At least one first slider is fixedly installed on the top and bottom of the U-shaped plate 302. The inner top and inner bottom of the frame 10 are provided with first slide rails for at least one first slider to slide left and right. The second telescopic member 306 is fixedly installed on the inner left side wall and inner right side wall of the frame 10 respectively. A small vertical plate is fixedly installed between the two first flat plates of the U-shaped plate 302. The small vertical plate is fixedly connected to the top end of the telescopic end of the second telescopic member 306. The top end of the telescopic end of the second telescopic member 306 is fixedly connected to the small vertical plate of the U-shaped plate 302 located on the same side.

[0056] The working principle of this invention is as follows: Select a matching cold drawing die 5 according to the style that the seamless steel pipe 1 needs to be processed into. After selecting the cold drawing die 5, the two are then bolted together and installed into the frame 10.

[0057] When the device is in its initial state, the drawing carriage 7 is located at the end of the mounting groove 901 near the forming unit, with a certain distance between it and the forming unit. The distance between the first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 is at its maximum. The telescopic ends of the two second telescopic members 306 are both in a shortened state, and the distance between the two feeding rollers 301 is at its maximum. The telescopic end of the first telescopic member 6 is in an extended state, and both the pretreatment mold 4 and the cold drawing mold 5 are located on the right side of the frame 10. At this time, the pretreatment mold 4 is located directly behind the support assembly 2.

[0058] The seamless steel pipe 1, which is conveyed from the cleaning device, is placed on the support assembly 2 by means of hoisting or by means of a robotic arm. The seamless steel pipe 1 will be located in multiple U-shaped plates 203 supported by the first vertical plate 202. The front end of the seamless steel pipe 1 passes between the left feeding assembly 3A and the right feeding assembly 3B and enters the forming hole of the pretreatment mold 4, where it comes into contact with the narrower front end of the extrusion roller 405.

[0059] The second telescopic component 306 is activated, and its telescopic end gradually extends, driving the U-shaped plate 302 to move closer to the seamless steel pipe 1 via the small vertical plate. The feeding rollers 301 on the U-shaped plate 302 move along with the U-shaped plate 302 until both feeding rollers 301 abut against the seamless steel pipe 1, thus clamping the seamless steel pipe 1. Multiple pressure sensors are circumferentially arranged around the central axis of each feeding roller 301, ensuring that even when the feeding roller 301 rotates to different angles, pressure sensors remain in contact with the seamless steel pipe 1 to sense its pressure. When a pressure sensor detects that the pressure has reached a preset value, it transmits information to the main controller, which then stops the second telescopic component 306 to prevent damage to the seamless steel pipe 1. At this time, the center point of the pretreatment mold 4 and the central axis of the seamless steel pipe 1 are on the same horizontal line.

[0060] The fourth motor 403 starts, and its output shaft drives the third gear 404 to rotate. The third gear 404 drives the gear ring 402 to rotate, which in turn drives the annular column 401 to rotate within the fixed frame 8. The annular column 401 drives three extrusion rollers 405 mounted on its inner surface to rotate, extruding the front end of the seamless steel pipe 1 that extends into the forming hole, making it thinner. Simultaneously, the first motor 305 starts, driving the first rotating shaft 304 in the right feeding assembly 3B to rotate. The first gear 307 mounted on the first rotating shaft 304 drives the second gear 308 to rotate in the opposite direction. The second gear 308 drives the left feeding assembly... In 3A, the first rotating shaft 304 rotates in the opposite direction, driving the feeding rollers 301 to rotate. The two feeding rollers 301 together drive the seamless steel pipe 1 to slide backward on the support assembly 2, continuing to feed the seamless steel pipe 1 into the pretreatment mold 4. When the length of the front end of the seamless steel pipe 1 after processing reaches the expected value, the fourth motor 403 is turned off, and the first motor 305 starts to rotate in the opposite direction, thereby driving the two feeding rollers 301 to rotate. The two feeding rollers 301 together drive the seamless steel pipe 1 to slide forward on the support assembly 2 until its front end exits from the forming hole of the pretreatment mold 4, and the first motor 305 stops.

[0061] The telescopic end of the first telescopic component 6 begins to shorten, causing the pre-treatment mold 4 and the cold drawing mold 5 to slide to the left in the frame 10 simultaneously until the center point of the cold drawing mold 5 and the center axis of the seamless steel pipe 1 are on the same horizontal line. The first telescopic component 6 then stops working, and the cold drawing mold 5 stops at this position.

[0062] The first motor 305 restarts, driving the two feeding rollers 301 to rotate. The two feeding rollers 301 together drive the seamless steel pipe 1 to slide backward on the support assembly 2, feeding the thinned front end of the seamless steel pipe 1 into the forming hole of the cold drawing die 5. The thinned front end of the seamless steel pipe 1 will extend from the rear of the forming hole of the cold drawing die 5 and engage with the positioning pin 706 on the front side of the vehicle body 701. The first motor 305 is paused, and the second motor 703 starts, driving the forward and reverse threaded ball screws 702 to rotate. The right-hand screw nut and the left-hand screw nut move synchronously towards each other on the forward and reverse threaded ball screws 702. The right-hand screw nut and the left-hand screw nut drive the first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 to move synchronously towards each other, so that the arc groove contacts the thinned front end of the seamless steel pipe 1, clamping the thinned front end of the seamless steel pipe 1. At this time, the lubricating oil has entered the oil chamber from the oil pipe 504 and then flows out from the oil chamber. Oil flows from the oil hole 503 on the outer wall of the inner mold 502 through the oil passage to the surface of the seamless steel pipe 1, lubricating the seamless steel pipe 1. The first motor 305 continues to work, driving the feeding roller 301 to rotate. The two feeding rollers 301 together drive the seamless steel pipe 1 to slide backward on the support assembly 2. At the same time, the third motor 903 starts. The speed of the first motor 305 and the third motor 903 are matched. The third motor 903 drives the ball screw 902 to rotate. The ball screw 902 drives the screw nut 904 to move backward. The screw nut 904 drives the car body 701 to move backward, continuously pulling the seamless steel pipe 1 out of the cold drawing mold 5. When the rear end of the seamless steel pipe 1 also enters the cold drawing mold 5, the first motor 305 stops rotating. The telescopic ends of the second telescopic component 306 begin to shorten until the left feeding assembly 3A and the right feeding assembly 3B return to their initial positions.

[0063] When the seamless steel pipe 1 is about to be fully pulled out of the cold drawing mold 5, the hoisting equipment will approach the rear half of the seamless steel pipe 1 in advance. When the seamless steel pipe 1 is fully pulled out of the cold drawing mold 5, it will be hoisted and kept at the original height to prevent it from falling. The second motor 703 reverses, thereby driving the first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 to move synchronously in opposite directions until the distance between them is the maximum. At this time, the thinner front end of the seamless steel pipe 1 is no longer clamped. The third motor 903 continues to rotate, driving the vehicle body 701 to move backward, so that the thinner front end of the seamless steel pipe 1 separates from the positioning pin 706. At this time, the seamless steel pipe 1 that has been cold drawn can be moved to the next process. At this time, the third motor 903 moves in the opposite direction, driving the vehicle body 701 to slide forward in the mounting groove 901 back to the initial position.

[0064] It should be noted that the present invention is not limited to the specific structure shown in the accompanying drawings in the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art.

Claims

1. A cold drawing device for seamless steel pipe production, characterized in that, It includes a support assembly (2) for supporting the seamless steel pipe (1), a forming unit for forming the seamless steel pipe (1), and a drawing unit for drawing the seamless steel pipe (1) arranged from front to back. A clamping and feeding unit for feeding the seamless steel pipe (1) on the support assembly (2) into the forming unit with adjustable spacing is provided between the support assembly (2) and the forming unit. The forming unit includes a frame (10), in which a pretreatment mold (4) capable of sliding left and right to thin the front end of the seamless steel pipe (1) and a cold drawing mold (5) capable of sliding left and right are detachably installed; the pretreatment mold (4) and the cold drawing mold (5) are detachably connected; the forming unit also includes a first telescopic member (6) for driving the pretreatment mold (4) and the cold drawing mold (5) to slide. The cold drawing die (5) includes a hollow cylindrical shell (501), and an mounting hole is provided at the center of the shell (501) for installing an inner die (502) for cold drawing of the seamless steel pipe (1). An oil cavity is formed between the interior of the shell (501) and the inner die (502). The inner die (502) has an annular cylindrical structure. Oil holes (503) for lubricating oil to pass through are provided on both the inner and outer sidewalls of the inner die (502). The oil holes (503) on the inner sidewall and the oil holes (503) on the outer sidewall are connected by an oil passage. An oil pipe (504) for conveying lubricating oil into the shell (501) is installed on the top of the shell (501). The drawing unit includes a drawing trolley (7) for drawing seamless steel pipe (1) that can slide back and forth, a mounting groove (901) for the drawing trolley (7) to slide back and forth, and a drive assembly (9) for driving the drawing trolley (7) to slide.

2. The cold drawing device for seamless steel pipe production according to claim 1, characterized in that, The support component (2) includes a base plate (201), on which a plurality of first vertical plates (202) are vertically installed at equal intervals from front to back. Each of the first vertical plates (202) has a U-shaped groove at its top, and a U-shaped plate (203) is installed in each of the U-shaped grooves.

3. The cold drawing device for seamless steel pipe production according to claim 1, characterized in that, The clamping and feeding unit includes a left feeding assembly (3A) and a right feeding assembly (3B) arranged symmetrically on the left and right sides. Both the left feeding assembly (3A) and the right feeding assembly (3B) include a concave plate (302) that can slide left and right and a second telescopic member (306) for driving the concave plate (302) to slide. The U-shaped plate (302) includes a second vertical plate and a first flat plate that is vertically installed on the upper and lower sides of the second vertical plate respectively. The front of the second vertical plate is vertically installed with an upper connecting plate (303A) and a lower connecting plate (303B) arranged vertically. A first rotating shaft (304) is rotatably installed between the upper connecting plate (303A) and the lower connecting plate (303B). A feeding roller (301) for driving the seamless steel pipe (1) to move is fixedly sleeved on the outside of the first rotating shaft (304). The top of the upper connecting plate (303A) in the right feeding assembly (3B) is equipped with a first motor (305) for driving the first rotating shaft (304) to rotate. The first rotating shaft (304) in the left feeding assembly (3A) and the first rotating shaft (304) in the right feeding assembly (3B) are connected by a first transmission member.

4. The cold drawing device for seamless steel pipe production according to claim 3, characterized in that, The lower end of the first rotating shaft (304) extends through the lower connecting plate (303B) and protrudes from the lower side of the lower connecting plate (303B). A first gear (307) is fixedly installed on the protruding part of the first rotating shaft (304) in the left feeding assembly (3A), and a second gear (308) that meshes with the first gear (307) is fixedly installed on the protruding part of the first rotating shaft (304) in the right feeding assembly (3B).

5. The cold drawing apparatus for seamless steel pipe production according to claim 3, characterized in that, The second telescopic member (306) is fixedly installed on the inner left side wall and the inner right side wall of the frame (10), and the top end of the telescopic end of the second telescopic member (306) is fixedly connected to the U-shaped plate (302) located on the same side.

6. A cold drawing apparatus for seamless steel pipe production according to any one of claims 1 to 5, characterized in that, The pretreatment mold (4) includes a fixed frame (8) and an annular column (401) rotatably mounted in the fixed frame (8). A gear ring (402) is fixedly sleeved on the outer surface of the annular column (401). The center point of the annular column (401) and the gear ring (402) coincides. A fourth motor (403) is mounted on the top of the fixed frame (8). A third gear (404) that meshes with the gear ring (402) is fixedly mounted on the output shaft of the fourth motor (403). The inner surface of the annular column (401) is provided with three extrusion rollers (405) at equal intervals in a circumferential direction for extruding and thinning the front end of the seamless steel pipe (1). The cold drawing die (5) also includes a mounting bracket (8) for mounting the housing (501).

7. The cold drawing apparatus for seamless steel pipe production according to claim 6, characterized in that, The fixing frame (8) includes two parallel square plates, which are fixedly connected by four connecting rods.

8. A cold drawing apparatus for producing seamless steel pipes according to any one of claims 1 to 5, characterized in that, The pulling trolley (7) includes a body (701) and a first L-shaped clamping arm (704) and a second L-shaped clamping arm (705) installed in the body (701) for clamping seamless steel pipe (1) with adjustable clamping distance. A forward and reverse toothed ball screw (702) is rotatably mounted in the vehicle body (701). A second motor (703) for driving the forward and reverse toothed ball screw (702) to rotate is mounted on the vehicle body (701). A right-handed screw nut is mounted on one side of the forward and reverse toothed ball screw (702), and a left-handed screw nut is mounted on the other side. The right-handed screw nut is fixedly connected to the bottom of the first L-shaped clamping arm (704), and the left-handed screw nut is fixedly connected to the bottom of the second L-shaped clamping arm (705).

9. A cold drawing apparatus for seamless steel pipe production according to claim 8, characterized in that, The front side of the vehicle body (701) is equipped with a positioning pin (706) for positioning by inserting into the thinner front end of the seamless steel pipe (1).

10. A cold drawing apparatus for producing seamless steel pipes according to any one of claims 1 to 5, characterized in that, The drive assembly (9) includes a ball screw (902) rotatably mounted in the mounting slot (901), the central axis of the ball screw (902) being parallel to the central axis of the seamless steel pipe (1); A third motor (903) for driving the ball screw (902) to rotate is installed at one end of the mounting groove (901) away from the forming unit. A screw nut (904) is installed on the ball screw (902) and is fixedly connected to the bottom of the pulling carriage (7).

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