Cold drawing device for seamless steel pipe production

Abstract

The invention relates to the field of equipment for manufacturing metal pipes in a drawing mode, in particular to a cold drawing device for seamless steel pipe production. The device comprises a supporting assembly used for supporting a seamless steel pipe, a forming unit used for forming the seamless steel pipe and a drawing unit used for drawing the seamless steel pipe which are sequentially arranged from front to back. A clamping and conveying unit used for conveying the seamless steel pipes on the supporting assembly into the forming unit is arranged between the supporting assembly and the forming unit, and the distance between the clamping and conveying unit and the forming unit is adjustable; the forming unit comprises a pretreatment mold and a cold-drawing mold which can slide left and right; the cold-drawing die comprises a shell, and an oil cavity is formed between the interior of the shell and the inner die; the inner die is of an annular cylinder structure, and oil holes for lubricating oil to pass through are formed in the inner side wall and the outer side wall of the inner die. An existing cold-drawing device has the problem of low efficiency, and the cold-drawing device for seamless steel pipe production provided by the invention is high in efficiency.

Description

Technical Field

[0001] The invention relates to the field of equipment for manufacturing metal pipes by drawing, and in particular to a cold drawing device for producing seamless steel pipes. Background Art

[0002] Cold drawing is a type of cold processing, which means that the metal is forcibly plastically processed mainly by force under normal temperature. When producing seamless steel pipes, a cold drawing device is needed to cold-draw and elongate the seamless steel pipes. Before cold drawing the seamless steel pipes, it is usually necessary to insert the steel pipes that meet the specifications into a rotating pretreatment device to pre-treat the seamless steel pipes. The pretreatment refers to thinning the front end of the seamless steel pipe so that it can be inserted into the small diameter mold of the cold drawing device. After the pretreatment is completed, the workers apply lubricants on the surface of the seamless steel pipes. The lubricants can prevent the seamless steel pipes from being hard torn during the cold drawing process. Then insert the thinned front end into the mold of the cold drawing device, grab the end of the seamless steel pipe extending from the mold with a drawing trolley, and pull it out of the mold. After the cold drawing is completed, the workers will saw off the thinned front end and send the seamless steel pipe to the degreasing device. In the above production process, the horizontal pulling force will extend the length of the seamless steel pipe, while the vertical pressure applied by the mold to the seamless steel pipe will reduce the cross-sectional area of ​​the seamless steel pipe. At the same time, the friction generated between the seamless steel pipe and the mold removes the oxide on the surface of the seamless steel pipe.

[0003] It can be seen that when cold drawing seamless steel pipes with existing cold drawing devices, pretreatment devices and cold drawing devices are required. When using them, seamless steel pipes need to be transported and transferred for transfer processes, which is troublesome to operate and makes the cold drawing efficiency low. At the same time, the lubricant is applied by workers, which takes a lot of time and the effect of application is not accurate, which will also reduce the cold drawing efficiency and even affect the product accuracy.

[0004] Therefore, the existing cold drawing device has the problem of low efficiency. Summary of the invention

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

[0006] In order to solve the above technical problems, the present invention provides a cold drawing device for seamless steel pipe production, which includes a support assembly for supporting the seamless steel pipe, a forming unit for forming the seamless steel pipe and a drawing unit for drawing the seamless steel pipe, which are arranged in sequence from front to back. A clamping and feeding unit with adjustable spacing is provided between the support assembly and the forming unit for feeding the seamless steel pipe on the support assembly into the forming unit; the forming unit includes a frame, in which a pretreatment die that can slide left and right for thinning the front end of the seamless steel pipe and a cold drawing die that can slide left and right are detachably installed, and the pretreatment die and the cold drawing die are detachably connected; the forming unit also includes a clamping and feeding unit for driving the pretreatment die The cold drawing die comprises a first telescopic part which slides with the cold drawing die; the cold drawing die comprises a hollow cylindrical outer shell, a mounting hole for mounting an inner die for cold drawing the seamless steel pipe is provided at the center of the outer shell, and an oil cavity is formed between the interior of the outer shell and the inner die; the inner die is an annular cylindrical structure, and oil holes for lubricating oil to pass through are provided on the inner and outer walls of the inner die, the oil holes on the inner wall are connected with the oil holes on the outer wall through an oil passage, and an oil pipe for conveying lubricating oil into the outer shell is installed on the top of the outer shell; the drawing unit comprises a drawing trolley which can slide back and forth for drawing the seamless steel pipe, a mounting groove for the drawing trolley to slide back and forth, and a driving component for driving the drawing trolley to slide. The pretreatment device and the cold drawing die are integrated by the pretreatment die and the cold drawing die that can slide left and right, so that the seamless steel pipe does not need to be transferred to the cold drawing device after pretreatment, which reduces the process, greatly reduces the difficulty of operation, and improves the efficiency of the device. At the same time, through the cooperation of the oil holes on the inner die of the cold drawing die and the oil pipe and other components, the device can automatically lubricate the surface of the seamless steel pipe when it reaches the inside of the cold drawing die, without the need for special workers to oil it or oiling it by the oiling device, which shortens the time and improves efficiency.

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

[0008] As a further improvement of the present invention: the clamping and feeding unit includes a left feeding component and a right feeding component which are symmetrically arranged; the left feeding component and the right feeding component both include a concave plate which can slide left and right and a second telescopic member for driving the concave plate to slide; the concave plate includes a second vertical plate and a first flat plate which is respectively vertically installed on the upper and lower sides of the second vertical plate, the front of the second vertical plate is vertically installed with an upper connecting plate and a lower connecting plate which are aligned up and down, a first rotating shaft is rotatably installed between the upper connecting plate and the lower connecting plate, and a feeding roller for driving the seamless steel pipe to move is fixedly sleeved outside 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 component, and the first rotating shaft in the left feeding component and the first rotating shaft in the right feeding component are connected by a first transmission member. Preferably, the lower ends of the first rotating shaft all penetrate the lower connecting plate and extend 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 component, 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 component. Preferably, the second telescopic member is fixedly mounted on the inner left and right walls of the frame, and the top ends of the telescopic ends of the second telescopic member are fixedly connected to the concave plates on the same side thereof. 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 die 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, the center points of the annular column and the gear ring coincide, 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 on the inner surface of the annular column; the cold drawing die also includes a fixed frame for mounting the outer shell. Preferably, the fixed frame includes two parallel square plates, and the two square plates are fixedly connected by four connecting rods.

[0010] As a further improvement of the present invention: the drawing trolley includes a car body and a first L-shaped clamping arm and a second L-shaped clamping arm installed in the car body for clamping the seamless steel pipe with an adjustable clamping distance; a positive and negative thread ball screw is rotatably installed in the car body, and a second motor for driving the positive and negative thread ball screw to rotate is installed on the car body; a right-hand screw nut is installed on one side of the positive and negative thread ball screw, 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, and the left-hand screw nut is fixedly connected to the bottom of the second L-shaped clamping arm. Preferably, a positioning pin for inserting into the tapered front end of the seamless steel pipe for positioning is installed on the front side of the car body.

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

[0012] The beneficial effects of the present invention are as follows: The cold drawing device for seamless steel pipe production provided by the present invention has high efficiency. The device has a pretreatment mold and a cold drawing mold that can slide left and right in the frame. Through the left and right sliding of the pretreatment mold and the cold drawing mold, the pretreatment mold and the cold drawing mold are aligned with the support assembly and the drawing unit respectively. Through the cooperation of the clamping and feeding unit, the pretreatment and cold drawing of the seamless steel pipe can be realized on the device. There is no need to transport and transfer the seamless steel pipe for the process change, the operation is simplified, and the efficiency is greatly improved. At the same time, the inner mold of the cold drawing mold of the device is provided with an oil hole, and an oil pipe is installed on the outer shell. Through the cooperation of the oil pipe, the oil cavity and the oil hole, the device can realize the lubrication of the surface of the seamless steel pipe when it passes through the inside of the cold drawing mold. There is no need for workers to oil the seamless steel pipe, the time consumed is less and the amount of oiling is relatively fixed, which greatly improves the efficiency. Therefore, the device has high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention and the seamless steel pipe; Figure 3 A top view of the present invention; Figure 4 It is a schematic diagram of the overall structure of a seamless steel pipe; Figure 5 It is a schematic diagram of the overall structure of the framework in the present invention; Figure 6 It is a schematic diagram of the overall structure of the frame and the delivery and clamping unit in the present invention; Figure 7 It is a schematic diagram of the overall structure of the feeding and clamping unit in the present invention; Figure 8 It is a schematic diagram of the overall structure of the molding unit in the present invention; Fig. 9 It is a schematic diagram of the overall structure of the molding unit in the present invention from another angle; Fig.10 This is a schematic diagram of the overall structure of the molding unit in the present invention without the frame; Fig.11 It is a partial structural schematic diagram of the molding unit in the present invention; Fig.12 It is a schematic diagram of the overall structure of the fixing frame and the protruding column in the present invention; Fig.13 It is a schematic diagram of the overall structure of the pretreatment mold in the present invention; Fig.14 It is a schematic diagram of the overall structure of the annular column and the extrusion roller in the present invention; Fig.15 It is a schematic diagram of the overall structure of the extrusion roller in the present invention; Fig.16 It is a schematic diagram of the overall structure of the fixing frame in the present invention; Fig.17 It is a schematic diagram of the overall structure of the fixing frame of the present invention from another angle; Fig.18 It is a schematic diagram of the overall structure of the cold drawing die in the present invention; Fig.19 It is a schematic diagram of the overall structure of the housing in the present invention; Fig. 20 It is a perspective schematic diagram of the overall structure of the inner mold in the present invention; Fig.21 It is a schematic diagram of the overall structure of the drawing unit and the driving assembly in the present invention; Fig. 22 A schematic diagram of the partial structure of the drawing unit and the driving assembly in the present invention Fig.23 It is a schematic diagram of the overall structure of the vehicle body in the present invention; Fig.24 It is a schematic diagram of the overall structure of the first L-shaped clamping arm in the present invention; The names of the components corresponding to the marks in the above drawings are: 1. seamless steel pipe; 2. Support assembly; 201. Bottom plate; 202. First vertical plate; 203. U-shaped plate; 3A, left feeding component; 3B, right feeding component; 301, feeding roller; 302, concave 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; 4. Pretreatment mold; 401. Annular column; 402. Gear ring; 403. Fourth motor; 404. Third gear; 405. Extrusion roller; 406. Boss; 5. Cold drawing die; 501. Shell; 502. Inner die; 503. Oil hole; 504. Oil pipe; 6. First telescopic member; 7. Pulling trolley; 701. Car body; 702. Positive and negative ball screw; 703. Second motor; 704. First L-shaped clamping arm; 705. Second L-shaped clamping arm; 706. Positioning pin; 8. Fixed frame; 9. Driving assembly; 901. Mounting slot; 902. Ball screw; 903. Third motor; 904. Screw nut; 10. Framework. DETAILED DESCRIPTION

[0014] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0015] Definitions of relevant terms involved in this invention: (1) The directional words such as "up", "down", "left", "right", "front", "back", "top", "bottom" etc. mentioned in the present invention are all Figure 3 The defined direction is used as the reference.

[0016] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a cold drawing device for seamless steel pipe production provided by the present invention comprises 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, which are arranged in sequence 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 and having adjustable spacing is provided between the support assembly 2 and the forming unit. The support assembly 2 comprises a bottom plate 201, on which a plurality of first vertical plates 202 are vertically installed equidistantly from front to back. The tops of the first vertical plates 202 are all provided with U-shaped grooves, and U-shaped plates 203 are installed in the U-shaped grooves. The U-shaped plates 203 can increase the contact area between the support assembly 2 and the seamless steel pipe 1. The device also comprises a main controller, which is respectively connected to the first motor 305, the second telescopic member 306, the fourth motor 403, the first telescopic member 6, the second motor 703, the third motor 903, and the pressure sensor. The second telescopic member 306 and the first telescopic member 6 are both cylinders, hydraulic cylinders or electric push rods.

[0017] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 , Fig. 9 , Fig.10 , Fig.11As shown, the forming unit includes a frame 10, in which 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 capable of sliding left and right for cold drawing of the seamless steel pipe 1 are detachably installed, and 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 pretreatment mold 4 and the cold drawing mold 5 to slide left and right, and a first telescopic member 6 for driving the pretreatment mold 4 and the cold drawing mold 5 to slide, and the bottom of the pretreatment mold 4 and the cold drawing mold 5 can be detachably installed with a second slider, and the top of the telescopic end of the first telescopic member 6 is fixedly installed with a driving plate, and the driving plate is fixedly connected to the second slider at the bottom of the cold drawing mold 5, and the length change of the telescopic end of the first telescopic member 6 can realize the left and right sliding of the driving plate, thereby driving the pretreatment mold 4 and the cold drawing mold 5 to slide.

[0018] like Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 As 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. The centers of the square plates are provided with guide holes corresponding to the forming holes of the two molds. A plurality of protrusions 406 are arranged circumferentially around the center point of the two square plates of the pretreatment mold 4 on the opposite sides, and an annular slide groove capable of rotating around the plurality of protrusions 406 is provided on the front and back sides of the annular column 401. A first clamping block is fixedly mounted on the right side of the fixed frame 8 of the pretreatment mold 4, and a second clamping block capable of clamping with the first clamping block is fixedly mounted on the left side of the fixed frame 8 of the cold drawing mold 5. After the second clamping block is clamped with the first clamping block, bolts are used for secondary connection. A gear ring 402 is fixedly sleeved on the outer surface of the annular column 401, and an annular groove for mounting the gear ring 402 is provided on the outer surface of the annular column 401, and the gear ring 402 is fixedly mounted in the above-mentioned annular groove. The center points of the annular column 401 and the gear ring 402 coincide with each other, a fourth motor 403 is installed on the top of the fixed frame 8, and a third gear 404 meshing with the gear ring 402 is fixedly installed on the output shaft of the fourth motor 403; three extrusion rollers 405 for squeezing and thinning the front end of the seamless steel pipe 1 are equidistantly arranged in an annular direction on the inner surface of the annular column 401, and the extrusion rollers 405 include a roller frame and an extrusion roller rotatably installed in the roller frame, and the diameter of the extrusion roller gradually increases from front to back, and the narrower diameter portion of the extrusion roller presents a concave cone-shaped structure with the outer surface facing inward, and the larger diameter portion of the extrusion roller presents a convex cone-shaped structure with the outer surface facing outward.

[0019] like Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 As shown, the cold drawing die 5 includes a hollow cylindrical shell 501, a mounting hole for mounting an inner die 502 for cold drawing the seamless steel pipe 1 is provided at the center of the shell 501, and an oil cavity is formed between the interior of the shell 501 and the inner die 502; the inner die 502 is an annular cylindrical structure, and oil holes 503 for lubricating oil to pass through are provided on the inner wall and the outer wall of the inner die 502, and the oil holes 503 on the inner wall are connected with the oil holes 503 on the outer wall through an oil passage, and an oil pipe 504 for conveying lubricating oil into the shell 501 is installed on the top of the shell 501, and the end of the oil pipe 504 away from the shell 501 is connected to an external oil tank storing lubricating oil; the cold drawing die 5 also includes a fixing frame 8 for mounting the shell 501.

[0020] like Figure 1 , Figure 2 , Figure 3 , Fig.21 , Fig. 22 , Fig.23 , Fig.24As shown, the drawing unit includes a drawing trolley 7 capable of sliding forward and backward for drawing the seamless steel pipe 1, a mounting groove 901 for the drawing trolley 7 to slide forward and backward, and a driving assembly 9 for driving the drawing trolley 7 to slide. The left and right sides of the bottom of the drawing trolley 7 are both installed with third sliders, and the top of the mounting groove 901 is provided with a third slide rail matching the third slider for the third slider to slide. The drawing trolley 7 includes a car body 701 and a first L-shaped clamping arm 704 and a second L-shaped clamping arm 705 installed in the car body 701 for clamping one end of the seamless steel pipe 1 extending from the cold drawing die 5 and with an adjustable clamping distance. The first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 are both provided with arc grooves on the sides in contact with the seamless steel pipe 1, and the arc grooves are both provided with patterns for enhancing friction; a positive and negative thread ball screw 702 is rotatably installed in the car body 701, and a second motor 703 for driving the positive and negative thread ball screw 702 to rotate is installed on the car body 701; a right-handed screw nut is installed on one side of the positive and negative thread ball screw 702, 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 704, and the left-handed 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 car body 701 for inserting into the tapered front end of the seamless steel pipe 1 for positioning. The driving assembly 9 includes a mounting groove 901 with a concave cross-section, in which a ball screw 902 is rotatably mounted, and the central axis of the ball screw 902 is 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, and a screw nut 904 is installed on the ball screw 902, and the screw nut 904 is fixedly connected to the bottom of the car body 701 of the drawing trolley 7.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7As shown, the clamping and feeding unit includes a left feeding component 3A and a right feeding component 3B which are symmetrically arranged on the left and right; the left feeding component 3A and the right feeding component 3B both include a concave plate 302 which can slide left and right and a second telescopic member 306 for driving the concave plate 302 to slide; the concave plate 302 includes a second vertical plate and a first flat plate which is vertically mounted on the upper and lower sides of the second vertical plate, and an upper connecting plate 303A and a lower connecting plate 303B which are aligned vertically are vertically mounted on the front side of the second vertical plate, and a space is left between the upper connecting plate 303A and the lower connecting plate 303B. There is a certain distance between the upper connecting plate 303A and the lower connecting plate 303B, and a first rotating shaft 304 is rotatably installed between them. A feeding roller 301 for driving the seamless steel pipe 1 to move is fixedly sleeved outside the first rotating shaft 304, and the surface of the feeding roller 301 has a pattern for increasing friction; a first motor 305 for driving the first rotating shaft 304 to rotate is installed on the top of the upper connecting plate 303A in the right feeding component 3B, and the first rotating shaft 304 in the left feeding component 3A is connected to the first rotating shaft 304 in the right feeding component 3B through a first transmission member. The lower ends of the first rotating shaft 304 all penetrate the lower connecting plate 303B and extend from the lower side of the lower connecting plate 303B, and a first gear 307 is fixedly installed on the extended portion of the first rotating shaft 304 in the left feeding component 3A, and a second gear 308 meshing with the first gear 307 is fixedly installed on the extended portion of the first rotating shaft 304 in the right feeding component 3B. At least one first sliding block is fixedly installed on the top and bottom of the concave-shaped plate 302, and the inner top and inner bottom of the frame 10 are provided with first sliding rails for at least one first sliding block to slide left and right; the second telescopic member 306 is respectively fixedly installed on the inner left wall and the inner right wall of the frame 10, and a small vertical plate is fixedly installed between the two first flat plates of the concave-shaped plate 302, and the small vertical plate is fixedly connected to the top end of the telescopic end of the second telescopic member 306, and the top ends of the telescopic ends of the second telescopic member 306 are respectively fixedly connected to the small vertical plates of the concave-shaped plate 302 located on the same side thereof.

[0022] The working principle of the present invention is as follows: a matching cold drawing die 5 is selected according to the style into which the seamless steel pipe 1 needs to be processed. After the cold drawing die 5 is selected, the two are then bolted together and installed in a frame 10.

[0023] When the device is in the initial state, the drawing trolley 7 is located at one end of the mounting slot 901 close to the molding unit, with a certain distance between the molding unit, and the distance between the first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 is the largest. The telescopic ends of the two second telescopic members 306 are in a shortened state, and the distance between the two feeding rollers 301 is the largest. The telescopic end of the first telescopic member 6 is in an extended state, and the pretreatment mold 4 and the cold drawing mold 5 are both located at the right side of the frame 10. At this time, the pretreatment mold 4 is located directly behind the support assembly 2.

[0024] The seamless steel pipe 1 transmitted from the cleaning device is placed on the support assembly 2 by hoisting or by a robotic arm. The seamless steel pipe 1 will be simultaneously located in multiple U-shaped plates 203 supported by the first vertical plate 202 respectively. The front end of the seamless steel pipe 1 passes through the left feeding assembly 3A and the right feeding assembly 3B, enters the forming hole of the pretreatment mold 4, and contacts the narrower front end of the extrusion roller 405.

[0025] Start the second telescopic member 306, the telescopic end of the second telescopic member 306 gradually extends, and drives the concave plate 302 to gradually move towards the direction close to the seamless steel pipe 1 through the small vertical plate. The feeding roller 301 on the concave plate 302 moves with the concave plate 302 until the two feeding rollers 301 are respectively in contact with the seamless steel pipe 1 to complete the clamping of the seamless steel pipe 1. The surface of the feeding roller 301 is circumferentially arranged around the central axis direction, so that even if the feeding roller 301 is rotated to different angles, there are pressure sensors that can contact the seamless steel pipe 1 to sense the pressure of the seamless steel pipe 1. When the pressure sensor senses that the pressure reaches the preset value, it will transmit information to the main controller, and the main controller will control the second telescopic member 306 to stop working to avoid crushing the seamless steel pipe 1. At this time, the center point of the pretreatment mold 4 and the center axis of the seamless steel pipe 1 are located on the same horizontal line.

[0026] The fourth motor 403 is started, and the output shaft of the fourth motor 403 drives the third gear 404 to rotate, and the third gear 404 drives the ring gear 402 to rotate, and the ring gear 402 drives the annular column 401 to rotate in the fixed frame 8, and the annular column 401 drives the three extrusion rollers 405 installed on its inner surface to rotate, and the front end of the seamless steel pipe 1 extending into the forming hole is squeezed to make it thinner. At the same time, the first motor 305 is started, and drives the first rotating shaft 304 in the right feeding component 3B to rotate, and the first gear 307 installed on the first rotating shaft 304 drives the second gear 308 to rotate in the opposite direction, and the second gear 308 drives the left feeding component The first rotating shaft 304 in 3A rotates in the opposite direction, and the first rotating shaft 304 drives the feeding rollers 301 to rotate respectively. The two feeding rollers 301 jointly drive the seamless steel pipe 1 to slide backward on the supporting assembly 2, and continue to feed the seamless steel pipe 1 into the pretreatment mold 4. When the front end length 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 jointly drive the seamless steel pipe 1 to slide forward on the supporting assembly 2 until its front end exits from the forming hole of the pretreatment mold 4, and the first motor 305 stops.

[0027] The telescopic end of the first telescopic member 6 begins to shorten, driving the pretreatment die 4 and the cold drawing die 5 to slide to the left in the frame 10 at the same time, until the center point of the cold drawing die 5 and the center axis of the seamless steel pipe 1 are located on the same horizontal line, the first telescopic member 6 stops working, and the cold drawing die 5 stays in this position.

[0028] The first motor 305 is started again, driving the two feeding rollers 301 to rotate. The two feeding rollers 301 jointly drive the seamless steel pipe 1 to slide backward on the support assembly 2, and send the already tapered front end of the seamless steel pipe 1 into the forming hole of the cold drawing die 5. The already tapered 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 car body 701. The first motor 305 is paused, and the second motor 703 is started, driving the positive and negative tooth ball screws 702 to rotate. The right-handed screw nut and the left-handed screw nut move toward each other synchronously on the positive and negative tooth ball screws 702. The right-handed screw nut and the left-handed screw nut drive the first L-shaped clamping arm 704 and the second L-shaped clamping arm 705 to move toward each other synchronously, so that the arc groove contacts the already tapered front end of the seamless steel pipe 1, and the already tapered front end of the seamless steel pipe 1 is clamped. At this time, the lubricating oil has entered the oil chamber from the oil pipe 504 and then from the oil chamber The oil passes through the oil hole 503 on the outer wall of the inner mold 502 through the oil passage and flows out from the oil hole 503 on the inner wall of the inner mold 502 to the surface of the seamless steel pipe 1 to lubricate the seamless steel pipe 1. The first motor 305 continues to work, driving the feeding roller 301 to rotate. The two feeding rollers 301 jointly drive the seamless steel pipe 1 to slide backward on the support assembly 2. At the same time, the third motor 903 is started, and the rotation speeds of the first motor 305 and the third motor 903 are adapted. The third motor 903 drives the ball screw 902 to rotate, and the ball screw 902 drives the screw nut 904 to move backward. The screw nut 904 drives the car body 701 to move backward, and the seamless steel pipe 1 is continuously pulled out from the cold drawing die 5. When the rear end of the seamless steel pipe 1 also enters the cold drawing die 5, the first motor 305 stops rotating, and the telescopic ends of the second telescopic member 306 begin to shorten until the left feeding assembly 3A and the right feeding assembly 3B return to their initial positions.

[0029] When the seamless steel pipe 1 is about to be completely pulled out of the cold drawing die 5, the hoisting equipment will approach the rear half of the seamless steel pipe 1 in advance, and when the seamless steel pipe 1 is completely pulled out of the cold drawing die 5, it will be hoisted and kept at the original height to prevent it from falling. The second motor 703 reverses, and then drives 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 the two is the largest. At this time, the thinned front end of the seamless steel pipe 1 is no longer clamped, and the third motor 903 continues to rotate, driving the car body 701 to move backward, so that the thinned front end of the seamless steel pipe 1 is separated 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 car body 701 to slide forward in the installation groove 901 back to the initial position.

[0030] It should be noted that the present invention is not limited to the specific structures shown in the drawings in the above-mentioned embodiments, and various changes can be made thereto within the knowledge scope of ordinary technicians in this field.

Claims

1. A cold drawing device for producing seamless steel pipes, characterized in that: The invention comprises 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), which are arranged in sequence 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 and having an adjustable spacing is provided between the support assembly (2); The molding unit comprises a frame (10), in which a pretreatment die (4) capable of sliding left and right for thinning the front end of the seamless steel pipe (1) and a cold drawing die (5) capable of sliding left and right are detachably mounted, and the pretreatment die (4) and the cold drawing die (5) are detachably connected; the molding unit further comprises a first telescopic member (6) for driving the pretreatment die (4) and the cold drawing die (5) to slide; The cold drawing die (5) comprises a hollow cylindrical outer shell (501), the center of which is provided with a mounting hole capable of mounting an inner die (502) for cold drawing a seamless steel pipe (1), and an oil cavity is formed between the interior of the outer shell (501) and the inner die (502); the inner die (502) is an annular cylindrical structure, the inner wall and the outer wall of the inner die (502) are both provided with oil holes (503) for lubricating oil to pass through, the oil holes (503) on the inner wall are connected to the oil holes (503) on the outer wall through an oil passage, and an oil pipe (504) for conveying lubricating oil into the outer shell (501) is installed at the top of the outer shell (501); The drawing unit comprises a drawing trolley (7) capable of sliding forward and backward for drawing a seamless steel pipe (1), a mounting groove (901) for the drawing trolley (7) to slide forward and backward, and a driving assembly (9) for driving the drawing trolley (7) to slide.

2. A cold drawing device for producing seamless steel pipes according to claim 1, characterized in that: The support assembly (2) comprises a bottom plate (201), on which a plurality of first vertical plates (202) are vertically mounted at equal intervals from front to back, and each of the first vertical plates (202) is provided with a U-shaped groove at the top, and each of the U-shaped grooves has a U-shaped plate (203) mounted therein.

3. A cold drawing device for producing seamless steel pipes according to claim 1, characterized in that: The clamping and conveying unit comprises a left conveying component (3A) and a right conveying component (3B) which are symmetrically arranged on the left and right sides; The left transport component (3A) and the right transport component (3B) both comprise a concave-shaped plate (302) capable of sliding left and right, and a second telescopic component (306) for driving the concave-shaped plate (302) to slide; The concave-shaped plate (302) comprises a second vertical plate and first flat plates respectively mounted vertically on the upper and lower sides of the second vertical plate; an upper connecting plate (303A) and a lower connecting plate (303B) aligned vertically are mounted vertically on the front of the second vertical plate; a first rotating shaft (304) is rotatably mounted 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); A first motor (305) for driving the first rotating shaft (304) to rotate is installed on the top of the upper connecting plate (303A) in the right transport component (3B), and the first rotating shaft (304) in the left transport component (3A) is connected to the first rotating shaft (304) in the right transport component (3B) via a first transmission member.

4. A cold drawing device for producing seamless steel pipes according to claim 3, characterized in that: The lower ends of the first rotating shafts (304) 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 portion of the first rotating shaft (304) in the left transport component (3A); and a second gear (308) meshing with the first gear (307) is fixedly mounted on the extended portion of the first rotating shaft (304) in the right transport component (3B).

5. A cold drawing device for producing seamless steel pipes according to claim 3, characterized in that: The second telescopic member (306) is respectively fixedly mounted on the inner left wall and the inner right wall of the frame (10), and the top ends of the telescopic ends of the second telescopic member (306) are respectively fixedly connected to the concave-shaped plates (302) located on the same side thereof.

6. A cold drawing device for producing seamless steel pipes according to any one of claims 1 to 5, characterized in that: The pretreatment mold (4) comprises 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 points of the annular column (401) and the gear ring (402) coincide with each other; a fourth motor (403) is mounted on the top of the fixed frame (8); a third gear (404) meshing 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 squeezing rollers (405) equidistantly arranged in an annular direction for squeezing and thinning the front end of the seamless steel pipe (1); The cold drawing die (5) further comprises a fixing frame (8) for mounting the housing (501).

7. A cold drawing device for producing seamless steel pipes according to claim 6, characterized in that: The fixing frame (8) comprises two mutually parallel square plates, and the two square plates are fixedly connected via four connecting rods.

8. A cold drawing device for producing seamless steel pipes according to any one of claims 1 to 5, characterized in that: The drawing trolley (7) comprises a trolley body (701) and a first L-shaped clamping arm (704) and a second L-shaped clamping arm (705) installed in the trolley body (701) for clamping the seamless steel pipe (1) and having an adjustable clamping distance; A positive and negative thread ball screw (702) is rotatably mounted in the vehicle body (701), and a second motor (703) for driving the positive and negative thread ball screw (702) to rotate is mounted on the vehicle body (701); a right-handed screw nut is mounted on one side of the positive and negative thread 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 device for producing seamless steel pipes according to claim 8, characterized in that: A positioning pin (706) is installed on the front side of the vehicle body (701) for inserting into the tapered front end of the seamless steel pipe (1) for positioning.

10. A cold drawing device for producing seamless steel pipes according to any one of claims 1 to 5, characterized in that: The driving assembly (9) comprises a ball screw (902) rotatably mounted in the mounting groove (901), wherein the central axis of the ball screw (902) is 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 installation groove (901) away from the molding unit. A screw nut (904) is installed on the ball screw (902). The screw nut (904) is fixedly connected to the bottom of the drawing trolley (7).

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