Seamless steel tube cold-drawing extrusion equipment

Abstract

The invention discloses seamless steel tube cold-drawing extrusion equipment, and belongs to the technical field of steel tube production equipment, the seamless steel tube cold-drawing extrusion equipment structurally comprises an embedded sliding mechanism capable of penetrating into a seamless steel tube, the embedded sliding mechanism is provided with a reducing hollow table, and the two ends of the reducing hollow table are respectively provided with a cold-drawing mechanism and a sizing mechanism; a plurality of extrusion pestles are arranged on the side part of the cold drawing mechanism and can rotate around the axis of the seamless steel pipe while moving along the axis of the seamless steel pipe; the seamless steel pipe cold-drawing device can integrally penetrate into the inner side of a seamless steel pipe with a large diameter, the multiple extrusion terminals distributed in the circumferential direction work cooperatively, so that the whole circumference of the inner wall of the steel pipe is stressed, the extrusion force at all positions is balanced, and the cold-drawing purpose is achieved along with shuttling of equipment in the seamless steel pipe; the smoothness of the inner surfaces of seamless steel pipes with different sizes can be flexibly optimized, all parts are efficiently shared, frequent disassembly and assembly are not needed, and the equipment manufacturing and using cost is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of seamless steel pipe production equipment, in particular to seamless steel pipe cold drawing extrusion equipment. Background Art

[0002] Cold drawing of seamless steel pipes is a method of reprocessing hot-rolled or hot-expanded pipes through cold drawing, aiming to improve the dimensional accuracy and surface quality of steel pipes; cold-drawn seamless steel pipes have higher accuracy and better surface finish than hot-rolled seamless steel pipes, which is particularly important for manufacturing precision parts such as mechanical structures or hydraulic equipment; during the cold drawing process, the steel pipe is extruded by the die draft at low temperature, slightly reducing the wall thickness of the steel pipe, thereby improving the accuracy and surface quality of the steel pipe; The inner surface of the seamless steel pipe is subjected to smoothness optimization treatment. The existing application number is CN202410218954.3, which is a cold drawing machine for steel pipe processing. The patent document discloses a solution for stably supporting the mandrel inserted into the inner side of the steel pipe, determining the shape and size of the processed steel pipe, making the steel pipe evenly stressed during cold drawing, reducing the hard pulling damage of the steel pipe cold drawing, and increasing the cold drawing effect of the steel pipe. Specifically: during cold drawing, the mandrel is first inserted into the inner hole of the steel pipe, wherein the size and shape of the mandrel can be adjusted arbitrarily according to the processing requirements, and the mandrel stand and the insertion device are required to assist in the process of inserting the mandrel, and the core head of the protruding part is welded to the steel pipe by welding. Connect to the mandrel, and then insert the entire steel pipe between the two auxiliary templates in the tube drawing stabilizing mechanism. The clamping mechanism moves on the cold drawing machine driving mechanism. After the clamping mechanism moves to the position of the tube drawing stabilizing mechanism, it clamps the steel pipe to be cold drawn. The auxiliary template and the drafting head in the tube drawing stabilizing mechanism shape the steel pipe to be cold drawn to prevent the steel pipe from having a diameter jump during the cold drawing process and prevent the strength of the cold drawn steel pipe from deteriorating. After the steel pipe is cold drawn by the tube drawing stabilizing mechanism, it will pass through the coaxial auxiliary component. The fixed axis wheel inside the coaxial auxiliary component supports and shapes the processed steel pipe, so that the cold drawn steel pipe is on the same axis to prevent the steel pipe from not being on the same axis after cold drawing. When using the technical solution in the above patent document, the steel pipe and the mandrel are lifted together and stably supported to ensure the coaxiality between the steel pipe and the mandrel; however, when processing steel pipes with longer lengths or larger diameters, a larger number of mandrel support mechanisms are required to provide stable support for the mandrel to prevent the steel pipe from bending and causing it to be misaligned with the mandrel, increasing the manufacturing cost of the equipment; and when switching to cold drawing of steel pipes of different diameters, it is also necessary to simultaneously replace mandrels of different sizes, coaxial auxiliary components and pipe drawing stabilization mechanisms, which are almost most of the components except the guide rails, resulting in a significant increase in the manufacturing cost and use cost of the equipment. Therefore, the present application provides a seamless steel pipe cold drawing extrusion equipment. Summary of the invention

[0003] In order to solve the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a seamless steel pipe cold drawing extrusion equipment, which can penetrate into the inner side of a seamless steel pipe with a larger diameter as a whole, reducing the need for lifting, moving and supporting the steel pipe, and the equipment has good flexibility in use and convenience in operation; multiple circumferentially distributed extrusion terminals are used to work together, so that the inner wall of the steel pipe is subjected to force all around, and the extrusion force at each location is balanced. As the equipment shuttles inside the seamless steel pipe, the cold drawing purpose is achieved. Since the maximum extension length of multiple extrusion terminals is adjustable, it can flexibly cope with the optimization treatment of the inner surface finish of seamless steel pipes of different sizes, and the internal components can be efficiently shared without frequent disassembly and assembly, thereby optimizing the manufacturing and use costs of the equipment.

[0004] The technical solution adopted by the present invention to solve the technical problem is: Provided is a seamless steel pipe cold drawing extrusion device, comprising an embedded sliding mechanism capable of penetrating into the seamless steel pipe, wherein a reducing hollow platform is arranged on the embedded sliding mechanism, and a cold drawing mechanism and a sizing mechanism are respectively installed at both ends of the reducing hollow platform; a plurality of extrusion pestles are arranged on the side of the cold drawing mechanism, and the plurality of extrusion pestles can move along the axis of the seamless steel pipe and rotate around the axis of the seamless steel pipe at the same time, and under the effect of the extrusion pestles extending obliquely, the inner wall of the steel pipe is subjected to force all around, and the extrusion force at each location is balanced.

[0005] Furthermore, a tension wheel and a first rotary driver for driving the tension wheel to rotate are installed in the hollow diameter reducing platform, and the side of the tension wheel penetrates the side wall of the hollow diameter reducing platform and is pressed against the inner side surface of the seamless steel pipe.

[0006] Furthermore, the ejector plate is slidably installed on the guide seat at the end of the hollow platform with reduced diameter, and a plurality of extrusion punches are obliquely and slidably installed on the side of the ejector plate. The outer edge of the extrusion punch is provided with a cold-drawn inclined surface, and the outer side surface of the extrusion punch can be pressed tightly against the inner side surface of the seamless steel pipe.

[0007] Furthermore, the core disc is sleeved and fixedly mounted on a plurality of guide cylinders, and the guide cylinders are detachably and fixedly mounted on the reduced diameter hollow platform.

[0008] Furthermore, a pressing disk is slidably mounted on the end of the guide cylinder, and an internal limiting mechanism is mounted between the core disk and the pressing disk; The inner limit mechanism includes an air bag with a plurality of anti-slip ridges on the surface, the outer side of the air bag can be pressed against the inner side of the seamless steel pipe, and the middle part of the air bag is integrally formed with a plurality of annular cylinders corresponding to the guide cylinders; the two ends of the air bag are respectively bonded to the end surfaces of the core disk and the extrusion disk, and the end of the air bag close to the extrusion disk is fixed and connected to an exhaust pipe with a valve and a plurality of cooling jet pipes, the exhaust pipe and the cooling jet pipe pass through the extrusion disk, and the end of the cooling jet pipe extends to the inner side of the seamless steel pipe; The valves on the exhaust pipe and the cooling jet pipe are divided into a first valve and a second valve, and both the first valve and the second valve can be wirelessly controlled valves or Internet of Things electric valves.

[0009] Furthermore, the extrusion punch is connected to the ejection disk via a connecting rod I, the two ends of the connecting rod I are rotatably connected to the hinged joints on the ejection disk and the extrusion punch respectively, and a limit rod is slidably installed between two adjacent extrusion punches.

[0010] The present application provides the following movement control method for the ejector disk: a screw and a second rotating driver for driving the screw to rotate are installed on the guide seat, and the ejector disk is connected to the screw by a threaded transmission; an end turntable is rotatably installed at the end of the guide seat, and the end turntable is connected to the extrusion pestle through a traction ear seat and a connecting rod II, the traction ear seat and the extrusion pestle are detachably fixedly connected, and the two ends of the connecting rod II are rotatably connected to the traction ear seat and the end turntable respectively.

[0011] Furthermore, an internal threaded sleeve is fixedly installed in the middle of the ejector disk, the internal threaded sleeve is connected to the screw rod through threaded transmission, a plurality of slots are provided between the inner side of the ejector disk and the outer side of the internal threaded sleeve, and the guide seat is slidably connected to the plurality of slots.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the seamless steel pipe cold drawing extrusion equipment of the example of the present invention, the cold drawing mechanism faces the inner side of the seamless steel pipe, and one end of the device is inserted into the seamless steel pipe; since the equipment is directly placed in the seamless steel pipe for use, there is no need to lift and hoist the seamless steel pipe, so the operation is convenient and the use flexibility is high.

[0013] 2. The cold drawing extrusion equipment for seamless steel pipes in the example of the present invention synchronously controls multiple extrusion pestles to rotate and open toward the outside of the ejection disk, and uses the cold drawing inclined surface to apply gradually increasing extrusion pressure to the defective area on the inner side of the seamless steel pipe, so that the inner wall of the seamless steel pipe can be stressed all around. As the seamless steel pipe is extruded from the inside to the outside and the extrusion direction approaches the tangential direction of the inner arc surface of the seamless steel pipe, the inclusions and surface defects attached to the inner side surface of the seamless steel pipe can be removed, and the smoothness optimization treatment of the local area on the inner side of the seamless steel pipe can be implemented.

[0014] 3. The seamless steel pipe cold drawing extrusion equipment of the example of the present invention, with the continuous operation of multiple extrusion pestles, controls the equipment to slide inside the seamless steel pipe, implements cold drawing treatment on the seamless steel pipe, and ensures the surface smoothness of various parts inside the seamless steel pipe; then, under the action of the core disk, a large area of ​​extrusion cold drawing treatment is applied to various parts inside the seamless steel pipe, solving the problem that seamless steel pipes with larger diameters are difficult to be cold drawn using traditional equipment.

[0015] 4. In the cold-drawn extrusion equipment for seamless steel pipes of the example of the present invention, the rotation center of the tension wheel can be in a non-perpendicular state to the axis of the seamless steel pipe, so that during the rotation of the tension wheel, the embedded sliding mechanism is driven to slide inside the seamless steel pipe while rotating around its own axis, so that multiple extrusion pestles apply uniform extrusion force to various locations on the inner side of the seamless steel pipe.

[0016] 5. The seamless steel pipe cold drawing extrusion equipment of the example of the present invention, since multiple core disks with the same structure are stacked and arranged inside the seamless steel pipe and pressed tightly against the inner side surface of the seamless steel pipe, can provide a stable supporting force for the extension of the extrusion punch and will not affect the original straightness of the steel pipe. Compared with the solutions in the prior art, the thickness of the core disk is much smaller than the length of the core rod. The core disk is used instead of the core rod, which reduces the straightness requirements for the extra-long length core rod, reduces the overall volume of the equipment, and optimizes the manufacturing cost and use cost of the equipment.

[0017] 6. The cold-drawn extrusion equipment for seamless steel pipes in the example of the present invention controls the periodic compression and expansion of the airbag during operation, and performs a cooling operation on the extrusion area inside the seamless steel pipe, so as to avoid the adverse effects of multiple and long-term mechanical actions of the extrusion pestle on the mechanical properties of the seamless steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the structure of a seamless steel pipe and a seamless steel pipe cold drawing extrusion device provided in an embodiment of the present invention; Figure 2 A schematic diagram of the overall structure of a seamless steel pipe cold drawing extrusion device provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a seamless steel pipe cold drawing extrusion equipment provided by an embodiment of the present invention; Figure 4 A cross-sectional view of a reduced diameter hollow platform and a guide cylinder provided in an embodiment of the present invention; Figure 5 A cross-sectional view of a guide tube and an air bag provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of an air bag, an air extraction pipe and a cooling air injection pipe provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of the ejector plate and the extrusion pestle provided in an embodiment of the present invention; Figure 8 For the present invention Figure 7 The enlarged view of point A in the middle; Fig. 9A schematic diagram of the structure of the traction ear seat and the end turntable provided in an embodiment of the present invention; Fig.10 A schematic diagram of the structure of an ejector disc and an internally threaded sleeve provided in an embodiment of the present invention; Fig.11 An exploded view of the structure of the extrusion pestle and a plurality of side baffles provided in an embodiment of the present invention; Fig.12 An exploded view of the structure of the guide seat and the end turntable provided in an embodiment of the present invention; Fig.13 A schematic structural diagram of a tension wheel provided in an embodiment of the present invention.

[0019] In the figure: 1 is embedded in the sliding mechanism, 11 is a hollow platform with a reduced diameter, 12 is a positioning arm, 13 is a tension wheel, 14 is a first rotating driver, 15 is an end cover, 16 is a limit edge, 17 is a second rotating driver, 18 is a guide seat, 19 is a screw rod, 2 is a cold drawing mechanism, 21 is an ejection plate, 21 is a slot, 22 is an internal threaded sleeve, 23 is a connecting rod I, 24 is an extrusion pestle, 241 is a hinge joint, 242 is a side baffle, 243 is a slide groove, 244 is a cold drawing inclined surface, 25 is a limit rod, 251 is a sliding pin, 26 is a traction ear seat, 27 is a connecting rod II, 28 is an end turntable, 3 is a sizing mechanism, 31 is a guide cylinder, 32 is a core disk, 33 is an extrusion disk, 34 is a limit column, 35 is a telescopic driver, 4 is an internal limit mechanism, 41 is an air bag, 41 is an anti-skid rib, 42 is an annular cylinder, 43 is an exhaust pipe, 44 is a filter cartridge, 45 is a first valve, 46 is a cooling jet pipe, 47 is a second valve, and 5 is a seamless steel pipe. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0022] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0026] Embodiment 1: like Figure 1 and Figure 2 As shown, the present embodiment provides a seamless steel pipe cold drawing extrusion equipment, including an embedded sliding mechanism 1, a cold drawing mechanism 2 and a sizing mechanism 3; the embedded sliding mechanism 1, the cold drawing mechanism 2 and the sizing mechanism 3 can be penetrated into the seamless steel pipe 5 together, and the cold drawing mechanism 2 is used to extrude the inner side of the seamless steel pipe 5 from the inside to the outside, and the cold drawing treatment is implemented as the equipment shuttles inside the seamless steel pipe 5; compared with the steel pipe cold drawing scheme used in the prior art, the cold drawing equipment of the present application does not need to lift the steel pipe when performing the cold drawing operation on the steel pipe, thereby reducing the demand for lifting and transporting the steel pipe, having good operation convenience, saving costs, and the overall size of the equipment is small, and the equipment has good flexibility in use and convenient operation.

[0027] like Figure 2 , Figure 4 and Fig.13As shown, the embedded sliding mechanism 1 includes a reducing hollow platform 11, the outer diameter of the reducing hollow platform 11 is slightly smaller than the inner diameter of the seamless steel pipe 5, a tension wheel 13 and a first rotating driver 14 for driving the tension wheel 13 to rotate are installed in the reducing hollow platform 11, a positioning arm 12 is fixedly installed on the inner side of the reducing hollow platform 11, and the shaft at the end of the tension wheel 13 is rotatably connected to the positioning arm 12 to enhance the rotation stability of the tension wheel 13; the surface of the tension wheel 13 is provided with high-strength engineering rubber to ensure a tight fit with the inner wall of the seamless steel pipe 5; there are multiple tension wheels 13, and the side of the tension wheel 13 penetrates the side wall of the reducing hollow platform 11 and is tightly pressed against the inner side of the seamless steel pipe 5.

[0028] It should be noted that Figure 2 The width dimension of the reduced diameter hollow platform 11 is for illustration only. The number of tension wheels 13 used and the width dimension of the reduced diameter hollow platform 11 may be increased or decreased according to the driving force required for the control device to move in the seamless steel pipe 5.

[0029] like Figure 2 and Figure 3 As shown, the cold drawing mechanism 2 includes an ejector plate 21, which is slidably mounted on a guide seat 18 at the end of the reducing hollow platform 11. A plurality of extrusion punches 24 are obliquely and slidably mounted on the side of the ejector plate 21. A cold drawing bevel 244 is provided on the outer edge of the extrusion punch 24. The cold drawing bevel 244 applies a gradually increasing extrusion force to the defective area on the inner side of the seamless steel pipe 5. The extrusion direction approaches the tangential direction of the inner arc surface of the seamless steel pipe 5. The arc surface on the outer side of the extrusion punch 24 can be pressed tightly against the inner side surface of the seamless steel pipe 5.

[0030] like Figure 2 As shown, the sizing mechanism 3 includes a plurality of core disks 32 whose outer contour diameters correspond to the inner diameters of the seamless steel pipes 5. The core disks 32 may be composed of a plurality of annular components nested in each other, thereby further reducing the cost of the equipment. A high-density elastic pad is provided on the outer side surface of the core disk 32 to avoid scratches and damage to the inner side surface of the seamless steel pipe 5. The plurality of core disks 32 are sleeved and fixedly mounted on a plurality of guide cylinders 31, and the guide cylinders 31 are detachably and fixedly mounted on the reducing hollow platform 11.

[0031] The end of the reduced diameter hollow platform 11 is detachably fixedly mounted with an end cover 15 , and a limiting edge 16 is integrally formed on the end cover 15 to increase the contact area between the end cover 15 and the outer side surface of the guide cylinder 31 .

[0032] like Figure 3 , Figure 7 , Fig. 9 , Fig.11 and Fig.12As shown, the extrusion pestle 24 is connected to the ejection disk 21 through a connecting rod Ⅰ23, and the two ends of the connecting rod Ⅰ23 are rotatably connected to the hinge joints 241 on the ejection disk 21 and the extrusion pestle 24 respectively. A limit rod 25 is slidably installed between two adjacent extrusion pestles 24, and an end turntable 28 is rotatably installed at the end of the guide seat 18. The end turntable 28 is connected to the extrusion pestle 24 through a traction ear seat 26 and a connecting rod Ⅱ27. The traction ear seat 26 is detachably fixedly connected to the extrusion pestle 24, and the two ends of the connecting rod Ⅱ27 are rotatably connected to the traction ear seat 26 and the end turntable 28 respectively.

[0033] like Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, a screw rod 19 and a second rotating driver 17 for driving the screw rod 19 to rotate are installed on the guide seat 18, an internal threaded sleeve 22 is fixedly installed in the middle of the ejection disk 21, the internal threaded sleeve 22 is connected to the screw rod 19 through a threaded transmission, a plurality of slots 211 are provided between the inner side of the ejection disk 21 and the outer side of the internal threaded sleeve 22, and the guide seat 18 is slidably connected with the plurality of slots 211.

[0034] The steps of cold drawing and extruding the seamless steel pipe 5 using the seamless steel pipe cold drawing and extrusion equipment of the present application are as follows: Step 1: Make the cold drawing mechanism 2 face the inner side of the seamless steel pipe 5 and insert one end of the device into the seamless steel pipe 5.

[0035] Step 2: Start the second rotary driver 17 and control the screw 19 to rotate so that the ejection disk 21 moves toward the end turntable 28. As the multiple connecting rods II 27 are synchronously rotated and opened on the end turntable 28, the multiple extrusion pestles 24 are driven to rotate and open toward the outside of the ejection disk 21. The cold-drawn inclined surface 244 applies a gradually increasing extrusion force to the defective area on the inner side of the seamless steel pipe 5, so that the inner wall of the seamless steel pipe 5 can be stressed all around. Under the limiting action of the connecting rod I 23 and the limiting rod 25, the reaction forces from all directions received by the multiple extrusion pestles 24 that cause the extrusion pestles 24 to deflect are balanced, ensuring that the multiple extrusion pestles 24 apply a stable and balanced force to various parts of the inner wall of the seamless steel pipe 5, and the seamless steel pipe 5 is extruded from the inside to the outside. The extrusion direction approaches the tangential direction of the inner arc surface of the seamless steel pipe 5, which can remove the inclusions and surface defects attached to the inner side of the seamless steel pipe 5, and implement the smoothness optimization treatment of the local area on the inner side of the seamless steel pipe 5.

[0036] Step three: Start the first rotary driver 14, control the rotation of the tension wheel 13, drive the equipment to slide in the seamless steel pipe 5, and with the continuous operation of multiple extrusion pestles 24, implement cold drawing treatment for the seamless steel pipe 5 to ensure the surface smoothness of various parts inside the seamless steel pipe 5; then, under the action of the core disk 32, apply large-area extrusion cold drawing treatment to various parts inside the seamless steel pipe 5 to solve the problem that seamless steel pipes 5 with larger diameters are difficult to cold draw using traditional equipment.

[0037] In the above step 1, when the equipment is initially used, the hydraulic mechanism can be used to push the equipment completely into the seamless steel pipe 5; since the equipment is directly placed in the seamless steel pipe 5 for use, there is no need to lift and hoist the seamless steel pipe 5, which is convenient to operate and has high flexibility of use.

[0038] In the above step 2, since the size of the extrusion pestle 24 is relatively small compared to the inner diameter of the seamless steel pipe 5, the force applied instantaneously is relatively concentrated, and a relatively large extrusion force can be applied locally to the inner side of the seamless steel pipe 5. Since the multiple extrusion pestles 24 are extended and rotated around the axis of the seamless steel pipe 5, the inclusions attached to the inner side of the seamless steel pipe 5 due to improper process can be efficiently scraped off, and by continuously squeezing the inner side of the seamless steel pipe 5 for multiple times, the problem of dents on the inner surface of the seamless steel pipe 5 caused by surface defects of the rolling rollers during the hot rolling process of the steel pipe can be overcome.

[0039] In the above step three, the rotation center of the tension wheel 13 can be in a non-perpendicular state with the axis of the seamless steel pipe 5, so that during the rotation of the tension wheel 13, it drives the embedded sliding mechanism 1 to slide inside the seamless steel pipe 5 while being able to rotate around its own axis, so that multiple extrusion pestles 24 apply uniform extrusion force to various locations on the inner side of the seamless steel pipe 5.

[0040] In the above step four, since multiple core disks 32 with the same structure are stacked and arranged inside the seamless steel pipe 5 and pressed tightly against the inner side surface of the seamless steel pipe 5, they can provide a stable supporting force for the extension of the extrusion pestle 24 and will not affect the original straightness of the steel pipe. Compared with the solutions in the prior art, the thickness of the core disk 32 is much smaller than the length of the core rod. Using the core disk 32 instead of the core rod reduces the straightness requirements for the extra-long length core rod, reduces the overall volume of the equipment, and optimizes the manufacturing cost and use cost of the equipment.

[0041] Embodiment 2: The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 4 and Figure 5 As shown, in this embodiment, a pressing plate 33 is slidably mounted on the end of the guide cylinder 31 , and a telescopic driver 35 for driving the pressing plate 33 to move is installed in the guide cylinder 31 .

[0042] like Figure 5 and Figure 6 As shown, an internal limit mechanism 4 is installed between the core disk 32 and the extrusion disk 33. When the surface finish optimization operation is performed on the seamless steel pipe 5, the internal limit mechanism 4 is used to limit the position of the device inside the seamless steel pipe 5. Specifically: The inner limiting mechanism 4 includes an airbag 41 with a plurality of anti-slip ridges 411 on the surface. The two ends of the airbag 41 are respectively bonded to the end surfaces of the core disk 32 and the extrusion disk 33. The outer side surface of the airbag 41 can be pressed tightly against the inner side surface of the seamless steel pipe 5. The middle part of the airbag 41 is integrally formed with a plurality of annular cylinders 42 corresponding to the guide cylinders 31.

[0043] Start the telescopic drive 35 and control the extrusion disk 33 to move toward the core disk 32, so as to squeeze the airbag 41, so that the outer side surface of the airbag 41 bulges and presses against the inner side surface of the seamless steel pipe 5, thereby limiting the position of the equipment inside the seamless steel pipe 5 and making the process of multiple extrusion pestles 24 squeezing the seamless steel pipe 5 from the inside to the outside more stable.

[0044] In order to increase the use effect of the inner limit mechanism 4, as Figure 5 and Figure 6 As shown, the anti-skid ribs 411 are annular in structure, and a plurality of anti-skid ribs 411 are equidistantly arranged on the outside of the airbag 41 to increase the anti-skid effect; a plurality of limit columns 34 are fixedly installed at one end of the extrusion disk 33 close to the core disk 32, and the limit columns 34 are plug-in and slidably connected to the guide cylinder 31. When the extrusion disk 33 moves relative to the core disk 32, the limit columns 34 slide in the guide cylinder 31, which will not cause local extrusion of the airbag 41 and has good stability in use.

[0045] Embodiment three: The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment, the air bag 41 is fixed at one end close to the extrusion disk 33 and is connected to an exhaust pipe 43 with a valve and a plurality of cooling jet pipes 46 with valves. The exhaust pipe 43 and the cooling jet pipe 46 pass through the extrusion disk 33. A filter cartridge 44 is provided at one end of the exhaust pipe 43 away from the air bag 41. The end of the cooling jet pipe 46 extends toward the inner side of the seamless steel pipe 5.

[0046] The valves on the exhaust pipe 43 and the cooling jet pipe 46 are divided into a first valve 45 and a second valve 47 , and both the first valve 45 and the second valve 47 can be wireless control valves or Internet of Things electric valves.

[0047] When there is no need to limit the position of the device inside the seamless steel pipe 5, the telescopic driver 35 is started to control the squeezing disk 33 to move toward or away from the core disk 32, and the airbag 41 is compressed and expanded. The specific details are as follows: During the compression stage of the airbag 41, the first valve 45 is closed and the second valve 47 is opened, and the air in the airbag 41 is sprayed from the cooling jet pipe 46 to the inner side of the seamless steel pipe 5, so as to cool the inner extrusion area of ​​the seamless steel pipe 5, thereby preventing the mechanical action of the extrusion pestle 24 from causing adverse effects on the mechanical properties of the seamless steel pipe 5 due to multiple and long periods of time; In the expansion stage of the airbag 41, the first valve 45 is opened, the second valve 47 is closed, and air enters the airbag 41 through the filter cartridge 44 and the air extraction pipe 43, and gas is added to the airbag 41 to prepare for the next stage of squeezing of the airbag 41. The above operation is repeated, so that the airbag 41 is compressed and expanded periodically, and the extrusion area inside the seamless steel pipe 5 is cooled to avoid local deformation of the seamless steel pipe 5.

[0048] In order to increase the cooling operation on the inner side of the seamless steel pipe 5, as Figure 2 , Figure 5 and Figure 6 As shown, the cooling jet pipe 46 is provided with a reducing port at one end away from the airbag 41 to increase the jet speed of the air; the distance between the end of the exhaust pipe 43 and the outer side surface of the extrusion plate 33 is more than twice the distance between the end of the cooling jet pipe 46 and the outer side surface of the pressure plate 33, thereby reducing the temperature of the air initially sucked into the airbag 41 and increasing the cooling treatment effect.

[0049] Embodiment 4: The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 7 , Figure 8 , Fig.10 and Fig.11 As shown, in this embodiment, a side baffle 242 is detachably fixedly mounted on the extrusion punch 24, and a sliding pin 251 is provided at the end of the limiting rod 25, and the sliding pin 251 is slidably engaged with the sliding groove 243 on the side baffle 242.

[0050] The slide groove 243 is used to limit the sliding range of the slide pin 251, and the maximum extension distance of the extrusion pestle 24 on the side of the ejection disk 21 is limited, so as to avoid the formation of local bulges on the outside of the seamless steel pipe 5 and destroy the original structure of the seamless steel pipe 5; since the side baffle 242 can be detached from the extrusion pestle 24, by replacing the side baffle 242 with different lengths of the slide groove 243 inside, the inner surface finish optimization treatment of seamless steel pipes 5 of different sizes can be flexibly responded to, and the various components can be efficiently shared without frequent disassembly and assembly. The equipment has a good universal use effect, and the manufacturing and use costs of the equipment are optimized.

[0051] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

[0052] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A seamless steel pipe cold drawing extrusion equipment, characterized in that: The invention comprises an embedded sliding mechanism (1), wherein the embedded sliding mechanism (1) comprises a reduced diameter hollow platform (11), wherein a tension wheel (13) and a first rotation driver (14) for driving the tension wheel (13) to rotate are installed in the reduced diameter hollow platform (11), wherein the side of the tension wheel (13) penetrates the side wall of the reduced diameter hollow platform (11) and is pressed against the inner side surface of the seamless steel pipe (5), and further comprises: A cold drawing mechanism (2) is arranged at one end of the hollow platform (11); the cold drawing mechanism (2) comprises an ejector plate (21), the ejector plate (21) is slidably mounted on a guide seat (18) at the end of the hollow platform (11), a plurality of extrusion punches (24) are obliquely and slidably mounted on the side of the ejector plate (21), the outer edge of the extrusion punches (24) is provided with a cold drawing inclined surface (244), and the outer side surface of the extrusion punches (24) can be pressed tightly against the inner side surface of the seamless steel pipe (5); A sizing mechanism (3) is arranged at the other end of the reducing hollow platform (11); the sizing mechanism (3) comprises a plurality of core disks (32) whose outer contour diameters correspond to the inner diameters of the seamless steel pipes (5); the plurality of core disks (32) are sleeved and fixedly mounted on a plurality of guide cylinders (31); and the guide cylinders (31) are detachably and fixedly mounted on the reducing hollow platform (11).

2. The seamless steel pipe cold drawing extrusion equipment according to claim 1, characterized in that: An extrusion disk (33) is slidably mounted on the end of the guide cylinder (31), and a telescopic driver (35) for driving the extrusion disk (33) to move is mounted in the guide cylinder (31); An internal limit mechanism (4) is installed between the core disk (32) and the extrusion disk (33); the internal limit mechanism (4) comprises an air bag (41) having a plurality of anti-slip ridges (411) on the surface thereof, the two ends of the air bag (41) being adhesively connected to the end surfaces of the core disk (32) and the extrusion disk (33) respectively, the outer side surface of the air bag (41) being able to press against the inner side surface of the seamless steel pipe (5), and the middle part of the air bag (41) being integrally formed with a plurality of annular cylinders (42) corresponding to the guide cylinders (31).

3. The seamless steel pipe cold drawing extrusion equipment according to claim 2, characterized in that: One end of the airbag (41) close to the extrusion disc (33) is fixed to and connected to an exhaust pipe (43) provided with a valve and a plurality of cooling jet pipes (46); the exhaust pipe (43) and the cooling jet pipes (46) penetrate the extrusion disc (33); the ends of the cooling jet pipes (46) extend toward the inner side of the seamless steel pipe (5).

4. The seamless steel pipe cold drawing extrusion equipment according to claim 1, characterized in that: The extrusion rod (24) is connected to the ejection disk (21) via a connecting rod I (23); the two ends of the connecting rod I (23) are rotatably connected to hinged joints (241) on the ejection disk (21) and the extrusion rod (24), respectively; and a limit rod (25) is slidably mounted between two adjacent extrusion rods (24); A screw rod (19) and a second rotation driver (17) for driving the screw rod (19) to rotate are mounted on the guide seat (18); the ejection plate (21) is connected to the screw rod (19) via a threaded transmission; An end turntable (28) is rotatably mounted on the end of the guide seat (18); the end turntable (28) is connected to the extrusion pestle (24) via a traction ear seat (26) and a connecting rod II (27); the traction ear seat (26) and the extrusion pestle (24) are detachably fixedly connected; and both ends of the connecting rod II (27) are rotatably connected to the traction ear seat (26) and the end turntable (28), respectively.

5. The seamless steel pipe cold drawing extrusion equipment according to claim 4, characterized in that: The extrusion ram (24) is detachably and fixedly mounted with a side baffle (242); the end of the limiting rod (25) is provided with a sliding pin (251); the sliding pin (251) is engaged and slidably connected with a sliding groove (243) on the side baffle (242).

6. The seamless steel pipe cold drawing extrusion equipment according to claim 4, characterized in that: An internally threaded sleeve (22) is fixedly mounted in the middle of the ejection disk (21), the internally threaded sleeve (22) is connected to the screw rod (19) via threaded transmission, a plurality of slots (211) are provided between the inner side of the ejection disk (21) and the outer side of the internally threaded sleeve (22), and the guide seat (18) is slidably engaged with the plurality of slots (211).

7. The seamless steel pipe cold drawing extrusion equipment according to claim 1, characterized in that: A filter cartridge (44) is provided at one end of the air extraction pipe (43) away from the air bag (41).

8. The seamless steel pipe cold drawing extrusion equipment according to claim 1, characterized in that: The cooling jet pipe (46) is provided with a diameter-changing opening at one end thereof that is away from the air bag (41).

9. The seamless steel pipe cold drawing extrusion equipment according to claim 1, characterized in that: The distance between the end of the exhaust pipe (43) and the outer side surface of the extrusion plate (33) is more than twice the distance between the end of the cooling air jet pipe (46) and the outer side surface of the pressure plate (33).

10. The seamless steel pipe cold drawing extrusion equipment according to claim 1, characterized in that: The anti-slip ribs (411) are in an annular structure, and a plurality of anti-slip ribs (411) are sleeved on the outside of the airbag (41) at equal intervals.

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