High-precision cold-drawing equipment for high-strength, high-toughness and corrosion-resistant stainless steel seamless steel pipe

Abstract

The invention discloses high-precision cold-drawing equipment for a high-strength high-toughness corrosion-resistant stainless steel seamless steel pipe, which comprises a cold-drawing die seat, a core-penetrating conveying vehicle body, a chained cold-drawing vehicle body, a drawing chain wheel vehicle and a chained transmission mechanism, and is characterized in that the cold-drawing die seat is fixedly mounted between the core-penetrating conveying vehicle body and the chained cold-drawing vehicle body; the core penetrating conveying vehicle body and the chain type cold drawing vehicle body are fixedly installed together, a drawing chain wheel vehicle is installed on the chain type cold drawing vehicle body in a sliding mode and located above the chain type transmission mechanism, and the chain type transmission mechanism is installed on the chain type cold drawing vehicle body. According to the revolutionary self-adaptive core rod design, uniform expansion and tight attachment to the inner wall of the steel pipe are achieved through a high-pressure and high-density liquid medium, deformation and frictional wear are reduced, and the pipe quality and the production efficiency are improved. The one-way circulation hydraulic system ensures accurate inlet and outlet of liquid, and bad backflow is avoided. And the steel pipe limiting mechanism improves the sleeving precision, prevents deformation and ensures smooth and efficient cold drawing.

Description

Technical Field

[0001] The present invention relates to the technical field of cold drawing of steel pipes, in particular to high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipes. Background Art

[0002] Steel pipe cold drawing machines are used for drawing ferrous and non-ferrous metal bars at room temperature and for secondary processing of raw pipe after hot rolling and extrusion. They are essential processing equipment for producing small-diameter, precision, thin-walled pipes with high mechanical properties. Their primary operating principle is to draw casing and drill pipe through the reciprocating motion of a hydraulic cylinder. Steel pipe cold drawing machines can be broadly categorized by bed structure: three-separate type and frame type. Drive types include chain, hydraulic, rack, and screw types.

[0003] Cold drawing is an important process in the production of stainless steel pipes. It can improve the dimensional accuracy, surface finish and corrosion resistance of steel pipes. The cold drawing process can be divided into two types: using a mandrel and not using a mandrel.

[0004] Cold drawing using a mandrel is commonly referred to as "mandrel drawing." In this method, a mandrel is inserted into the steel tube and cold-drawn along with it. The mandrel allows for a larger deformation ratio, making it suitable for cold drawing long stainless steel tubes. The smooth inner surface of the mandrel further improves the tube's inner wall precision and surface quality. Furthermore, mandrel drawing can produce non-standard seamless stainless steel tubes of specialized sizes and cross-sections.

[0005] Cold drawing without a mandrel is often referred to as "mandrel-free drawing." In this method, the tube is cold drawn without a mandrel. This method is suitable for shorter tubes or where dimensional accuracy is less critical. While mandrel-free drawing is simple to perform, it may not achieve the same accuracy and surface quality as using a mandrel.

[0006] In general, the cold drawing method using a mandrel can achieve higher dimensional accuracy and surface quality, and is suitable for producing long stainless steel pipes with high precision requirements. The cold drawing method without a mandrel is suitable for short steel pipes or occasions with low dimensional accuracy requirements.

[0007] Existing mandrel cold drawing technology faces several significant challenges, the most prominent of which is the mandrel's poor overall deformability. This limitation prevents the mandrel from evenly and tightly fitting the inner wall of the steel tube, and consequently, from providing uniform radial force during the cold drawing process. This uneven force distribution not only severely impacts cold drawing accuracy but also reduces the stability of the entire process.

[0008] Another significant issue is that conventional mandrels directly contact the inner wall of the steel pipe, resulting in significant friction and wear. This friction not only further affects cold drawing accuracy but also increases production costs and maintenance, requiring frequent mandrel replacement. Furthermore, the heat generated during the friction process is a significant concern. If this heat cannot be effectively transferred and dissipated, the steel pipe may overheat and deform or even fail, undoubtedly increasing production risks and costs.

[0009] Therefore, it is very necessary to invent a high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe. Summary of the Invention

[0010] The present invention provides a high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipes. The present invention provides the following technical solutions: comprising a cold drawing die base, a core conveying body, a chain cold drawing body, a sprocket drawing vehicle, and a chain transmission mechanism. The cold drawing die base is fixedly installed between the core conveying body and the chain cold drawing body. The core conveying body and the chain cold drawing body are fixedly installed together. The sprocket drawing vehicle is slidably installed on the chain cold drawing body and is located above the chain transmission mechanism. The chain transmission mechanism is installed on the chain cold drawing body. The core conveying body includes a conveying body, a steel pipe limiting mechanism, a one-way circulation hydraulic system and an adaptive mandrel device. The steel pipe limiting mechanisms are symmetrically and evenly installed on both sides of the conveying body. The steel pipe limiting mechanisms are located on both sides of the one-way circulation hydraulic system and the adaptive mandrel device. The adaptive mandrel device is fixedly installed on the one-way circulation hydraulic system, and the one-way circulation hydraulic system is fixedly installed on the conveying body. The steel pipe limiting mechanism includes a torsion vertical shaft, a lifting limiting plate, a steering gear, a damping cylinder and a base. The upper end of the torsion vertical shaft is fixedly connected to the lifting limiting plate. The steering gear is fixedly installed on the torsion vertical shaft. The steering gear is located above the damping cylinder. The damping cylinder is fixedly installed on the conveying vehicle body through the base. The damping cylinder is connected to the torsion vertical shaft for damping rotation; the steering gear is intermittently meshed with the gear group. The one-way circulation hydraulic system includes a circulation base, a piston rod, a top plate, a spring, an injection check valve, a hydraulic pump, an oil storage tank group, a discharge check valve and a circulation chamber. The circulation base is fixedly mounted on the transport vehicle body. A circulation chamber is opened inside the circulation base. A piston rod is installed in the circulation chamber. A top plate is fixedly mounted on the upper end of the piston rod. The top plate is elastically mounted above the circulation base through a spring. The circulation chamber set inside the circulation base is connected to the hydraulic pump through the injection check valve. The hydraulic pump is connected to the oil storage tank group. The oil storage tank group is connected to the circulation chamber through at least three of the discharge check valves. The adaptive mandrel device includes a supporting mandrel, an oil hole, a pressure plate, an expansion sleeve and a flange. The oil holes are evenly distributed on the supporting mandrel. The supporting mandrel is fixedly connected to the expansion sleeve through the pressure plate. The expansion sleeve is fixedly connected to the flange. One end of the flange and the supporting mandrel is fixedly connected to the circulation base, and the circulation cavity arranged inside the circulation base is communicated with the supporting mandrel.

[0011] Preferably, the conveying body includes a body, support legs, screw slots, ball screw, drive motor, ball nut and conveying platform, support legs are symmetrically fixedly installed on both sides of the lower side of the body, and two said screw slots are symmetrically opened above the body, and a ball screw is rotatably installed in the screw slot, and either end of the ball screw rotates through the screw slot and passes through the body and is fixedly connected to the output end of the drive motor fixedly installed outside it; a ball nut is installed on the ball screw, and the ball nut is fixedly connected to the conveying platform, and gear sets are respectively installed on both sides of the conveying platform.

[0012] Preferably, the lifting and limiting plate is composed of a lifting portion and a transverse plate portion, the lifting portion of the lifting and limiting plate is an arc-shaped structure, and the lifting and limiting plate is located below the adaptive mandrel device.

[0013] Preferably, the number of teeth provided in the gear set allows the steering gear to be driven to rotate ninety degrees, the steering gear and the gear set are on the same horizontal line, and the steering gear is located on both sides of the vehicle body.

[0014] Preferably, the circulation chamber arranged inside the circulation base is a "T"-shaped cavity, which is composed of a vertical cavity portion and a horizontal cavity portion. The horizontal cavity portion of the circulation chamber is connected to the supporting core rod and the injection one-way valve. A piston rod is installed in the vertical cavity portion of the circulation chamber, and a spring is sleeved on the outside of the upper end of the piston rod.

[0015] Preferably, the oil storage tank group is a tank group consisting of at least three oil tanks, each oil tank is connected through a solenoid valve, and heat dissipation fins are installed on the outside of the oil tank. The oil tanks are all connected to the discharge one-way valve, and the bottom oil tank is also connected to the hydraulic pump.

[0016] Preferably, the supporting core rod is located inside the expansion sleeve, and one end of the expansion sleeve is fixedly connected to the supporting core rod through the pressure plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention introduces a revolutionary adaptive mandrel design that differs fundamentally from traditional mandrels in function and performance. This innovation lies primarily in the ability to inject a high-pressure, high-density liquid medium into the adaptive mandrel holder, causing it to expand uniformly. This expanded adaptive mandrel holder forms a tight fit with the inner wall of the steel pipe, exhibiting exceptional deformation capabilities. Therefore, during the cold drawing process of the steel pipe, the adaptive mandrel holder can provide a uniform and stable radial force to the pipe, significantly reducing the potential for uneven deformation during cold drawing. This design also significantly improves the roundness and wall thickness accuracy of the pipe, thereby ensuring product quality and performance.

[0018] The present invention abandons the traditional method of direct contact between the mandrel and the inner wall of the pipe and innovatively adopts a uniform fitting design. When the adaptive mandrel holder expands, it can form a close fitting contact with the inner wall of the steel pipe, thereby significantly reducing the generation of friction and wear. This improvement not only extends the service life of the pipe and mandrel, but also greatly reduces the frequency of maintenance and replacement, significantly improving production efficiency and cost-effectiveness. In addition, the liquid medium injected into the adaptive mandrel holder can effectively transfer heat during the cold drawing process. This design helps the pipe to dissipate heat in a timely manner during cold drawing, preventing the pipe from deformation or damage due to overheating.

[0019] The one-way hydraulic system of this invention is the key power source for the adaptive mandrel tool's deformation capabilities. Its unique feature is its one-way circulation system. Within this system, high-pressure, high-density liquid media precisely enters and exits the adaptive mandrel tool in a one-way circulation pattern. This design cleverly prevents uncontrolled backflow of the liquid media when subjected to strong external pressure, significantly minimizing the potential adverse effects of liquid media discharge or backflow.

[0020] The steel pipe restraining mechanism of this invention plays a crucial role. It not only helps to more precisely fit the steel pipe onto the exterior of the adaptive mandrel holder, thereby reducing the difficulty of manual core alignment and improving production efficiency, but also effectively supports the steel pipe during the cold drawing process, preventing deformation due to gravity. This design not only ensures the stability and integrity of the steel pipe but also ensures a smooth and efficient subsequent cold drawing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is another overall structural diagram of the present invention.

[0023] Figure 3 It is a schematic diagram of the core-through conveying vehicle body structure of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the conveying vehicle body of the present invention.

[0025] Figure 5 It is a structural schematic diagram of the steel pipe limiting mechanism of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the one-way circulation hydraulic system of the present invention.

[0027] Figure 7 It is a structural schematic diagram of the adaptive mandrel device of the present invention.

[0028] In the picture: Cold drawing die base 1, core conveying body 2, conveying body 21, body 211, support leg 212, screw slot 213, ball screw 214, drive motor 215, ball nut 216, conveying platform 217, gear group 218, steel pipe limiting mechanism 22, torsion vertical shaft 221, lifting limiting plate 222, steering gear 223, damping cylinder 224, base 225, one-way circulation hydraulic system 23, circulation base 231, piston rod 232, top plate 233, spring 234, injection check valve 235, hydraulic pump 236, oil storage tank group 237, discharge check valve 238, circulation chamber 239, adaptive mandrel device 24, support mandrel 241, oil hole 242, pressure plate 243, expansion sleeve 244, flange 245, chain cold drawn body 3, sprocket drawing vehicle 4, chain transmission mechanism 5. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] As attached Figure 1-7 As shown: The present invention provides a high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless steel pipe, including a cold drawing die base 1, a core conveying body 2, a chain cold drawing body 3, a drawing sprocket car 4 and a chain transmission mechanism 5. The cold drawing die base 1 is fixedly installed between the core conveying body 2 and the chain cold drawing body 3, the core conveying body 2 and the chain cold drawing body 3 are fixedly installed together, the drawing sprocket car 4 is slidably installed on the chain cold drawing body 3, and is located above the chain transmission mechanism 5, and the chain transmission mechanism 5 is installed on the chain cold drawing body 3.

[0031] The core-through conveying body 2 includes a conveying body 21, a steel pipe limiting mechanism 22, a one-way circulation hydraulic system 23 and an adaptive mandrel device 24. The steel pipe limiting mechanism 22 is symmetrically and evenly installed on both sides of the conveying body 21, which is used to fix and limit the position of the steel pipe to ensure the stability of the cold drawing process. The steel pipe limiting mechanism 22 is located on both sides of the one-way circulation hydraulic system 23 and the adaptive mandrel device 24. The adaptive mandrel device 24 is fixedly installed on the one-way circulation hydraulic system 23, and the one-way circulation hydraulic system 23 is fixedly installed on the conveying body 21.

[0032] The steel pipe limiting mechanism 22 includes a torsion vertical shaft 221, a lifting limiting plate 222, a steering gear 223, a damping cylinder 224 and a base 225. The upper end of the torsion vertical shaft 221 is fixedly connected to the lifting limiting plate 222. The steering gear 223 is fixedly installed on the torsion vertical shaft 221. The steering gear 223 is located above the damping cylinder 224. The damping cylinder 224 is fixedly installed on the conveying body 21 through the base 225. The damping cylinder 224 is connected to the torsion vertical shaft 221 for damping rotation; the steering gear 223 is intermittently meshed with the gear group 218. In this way, stable steering of the steel pipe limiting mechanism 22 can be achieved during the conveying process.

[0033] The one-way circulation hydraulic system 23 includes a circulation base 231, a piston rod 232, a top plate 233, a spring 234, an injection check valve 235, a hydraulic pump 236, an oil storage tank group 237, a discharge check valve 238 and a circulation chamber 239. The circulation base 231 is fixedly installed on the conveying body 21. A circulation chamber 239 is opened inside the circulation base 231. The piston rod 232 is installed in the circulation chamber 239. The top plate 233 is fixedly installed on the upper end of the piston rod 232. The top plate 233 is elastically installed above the circulation base 231 through a spring 234. The circulation chamber 239 set inside the circulation base 231 is connected to the hydraulic pump 236 through the injection check valve 235. The hydraulic pump 236 is connected to the oil storage tank group 237. The oil storage tank group 237 is connected to the circulation chamber 239 through at least three of the discharge check valves 238. This design enables the liquid medium to circulate in the system, providing stable hydraulic support for the cold drawing process.

[0034] The adaptive mandrel device 24 includes a supporting mandrel 241, an oil hole 242, a pressure plate 243, an expansion sleeve 244 and a flange 245. The oil holes 242 are evenly distributed on the supporting mandrel 241. The supporting mandrel 241 is fixedly connected to the expansion sleeve 244 through the pressure plate 243. The expansion sleeve 244 is fixedly connected to the flange 245. The flange 245 and one end of the supporting mandrel 241 are fixedly connected to the circulation base 231, and the circulation cavity 239 arranged inside the circulation base 231 is communicated with the supporting mandrel 241. During the cold drawing process, the liquid medium enters the expansion sleeve 244 through the oil hole 242, so that it fits tightly with the inner wall of the steel pipe, thereby providing uniform radial force and improving the accuracy and stability of cold drawing. Example

[0035] Specifically, the conveying body 21 includes a body 211, support legs 212, a screw slot 213, a ball screw 214, a drive motor 215, a ball nut 216 and a conveying platform 217. The support legs 212 are symmetrically fixedly installed on both sides of the lower side of the body 211, and two said screw slots 213 are symmetrically opened above the body 211. The ball screw 214 is rotatably installed in the screw slot 213. Either end of the ball screw 214 rotates through the screw slot 213 and passes through the body 211 and is fixedly connected to the output end of the drive motor 215 fixedly installed on its outside; a ball nut 216 is installed on the ball screw 214, and the ball nut 216 is fixedly connected to the conveying platform 217. Gear tooth groups 218 are respectively installed on both sides of the conveying platform 217. This design enables the steel pipe to be stably transmitted on the conveying platform, and cooperates with the gear tooth group 218 to realize stable steering of the steel pipe limiting mechanism 22.

[0036] Specifically, the lifting and limiting plate 222 is composed of a lifting part and a horizontal plate part. The lifting part of the lifting and limiting plate 222 is an arc structure. The lifting and limiting plate 222 is located below the adaptive mandrel device 24 to ensure the stability and safety of the steel pipe during the cold drawing process and reduce the difficulty of inserting the core.

[0037] Specifically, the number of teeth set in the gear tooth group 218 allows the steering gear 223 to rotate ninety degrees. The steering gear 223 and the gear tooth group 218 are on the same horizontal line. The steering gear 223 is located on both sides of the vehicle body 211. This design ensures the stability of the steel pipe during transmission and the accuracy of the steering of the steel pipe limiting mechanism 22.

[0038] Specifically, the circulation chamber 239 arranged inside the circulation base 231 is a "T"-shaped cavity, which is composed of a vertical cavity portion and a horizontal cavity portion. The horizontal cavity portion of the circulation chamber 239 is connected to the support core rod 241 and the injection check valve 235. A piston rod 232 is installed in the vertical cavity portion of the circulation chamber 239, and a spring 234 is mounted on the outside of the upper end of the piston rod 232. This design enables the liquid medium to flow smoothly in the circulation chamber, providing stable hydraulic support for the cold drawing process.

[0039] Specifically, the oil storage tank group 237 is a tank group consisting of at least three oil tanks, each of which is connected by a solenoid valve, and a heat dissipation fin is installed on the outside of the oil tank. The heat dissipation fin allows the liquid medium inside to be cooled quickly, so as to absorb heat for the pipeline in the subsequent cold drawing process. The oil tanks are all connected to the discharge one-way valve 238, and the bottom oil tank is also connected to the hydraulic pump 236, realizing the recycling of the liquid medium.

[0040] Specifically, the supporting core rod 241 is located inside the expansion sleeve 244 , and one end of the expansion sleeve 244 is fixedly connected to the supporting core rod 241 through the pressure plate 243 . Example

[0041] Preparation stage: Place the steel pipe to be processed on the core conveyor body 2 and ensure that the steel pipe is placed on the outside of the adaptive mandrel device 24. Start the drive motor 215 to rotate the ball screw 214, thereby driving the conveying platform 217 to move and convey the steel pipe to the appropriate position.

[0042] Steel pipe positioning and restriction: When the steel pipe moves through the conveying platform 217, the torsion vertical shaft 221 and the lifting restriction plate 222 of the steel pipe restriction mechanism 22 restrict and lift the steel pipe to ensure the stability of the steel pipe during the cold drawing process.

[0043] Preparation of the adaptive mandrel device 24: The one-way circulation hydraulic system 23 starts working, and the hydraulic pump 236 pumps the high-pressure, high-density liquid medium in the oil storage tank assembly 237 into the circulation chamber 239 through the injection one-way valve 235. The liquid medium is injected into the expansion sleeve 244 of the adaptive mandrel device 24 through the support mandrel 241.

[0044] Expansion and conformation of the adaptive mandrel device 24: As the liquid medium is injected, the expansion sleeve 244 begins to expand and conforms tightly to the inner wall of the steel pipe. At this time, the adaptive mandrel device 24 provides a uniform radial force to the steel pipe.

[0045] The cold drawing operation begins: when the adaptive mandrel device 24 is in close contact with the inner wall of the steel pipe, the chain transmission mechanism 5 starts to work, driving the drawing sprocket vehicle 4 holding one end of the steel pipe to slide along the chain cold drawing vehicle body 3, thereby cold drawing the steel pipe.

[0046] Cold Drawing and Cooling of Steel Pipes: During the cold drawing process, the one-way circulating hydraulic system 23 recycles the liquid medium inside the adaptive mandrel 24, ensuring a close fit with the inner wall of the steel pipe and maintaining the internal pressure of the adaptive mandrel 24 to prevent rupture or damage caused by excessive pressure. The liquid medium also effectively transfers heat, dissipating heat from the steel pipe and preventing overheating and deformation.

[0047] Cold Drawing Completion and Subsequent Processing: When the steel pipe is cold-drawn to the desired length or shape, the chain drive mechanism 5 stops, and the conveyor platform 217 moves backward to remove the cold-drawn steel pipe. At this time, the one-way circulation hydraulic system 23 also stops, and the liquid medium in the adaptive mandrel device 24 is completely returned to the oil storage tank assembly 237 through the discharge check valve 238. Example

[0048] The operating principle of this invention is primarily based on the expansion and contact of the adaptive mandrel holder 24 and the circulation of liquid media in the one-way hydraulic system 23. The adaptive mandrel holder 24 expands by injecting high-pressure, high-density liquid media, tightly contacting the inner wall of the steel pipe and providing uniform radial force. The one-way hydraulic system 23 ensures a continuous supply and return of liquid media, while also cooling the steel pipe. The coordinated operation of the entire equipment structure enables the cold drawing of steel pipes.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipes, characterized by: The invention comprises a cold drawing die seat (1), a core conveying body (2), a chain cold drawing body (3), a sprocket drawing vehicle (4) and a chain transmission mechanism (5), wherein the cold drawing die seat (1) is fixedly installed between the core conveying body (2) and the chain cold drawing body (3), the core conveying body (2) and the chain cold drawing body (3) are fixedly installed together, the sprocket drawing vehicle (4) is slidably installed on the chain cold drawing body (3) and is located above the chain transmission mechanism (5), and the chain transmission mechanism (5) is installed on the chain cold drawing body (3); The core-penetrating conveying body (2) comprises a conveying body (21), a steel pipe limiting mechanism (22), a one-way circulation hydraulic system (23) and an adaptive mandrel device (24). The steel pipe limiting mechanism (22) is symmetrically and evenly installed on both sides of the conveying body (21). The steel pipe limiting mechanism (22) is located on both sides of the one-way circulation hydraulic system (23) and the adaptive mandrel device (24). The adaptive mandrel device (24) is fixedly installed on the one-way circulation hydraulic system (23), and the one-way circulation hydraulic system (23) is fixedly installed on the conveying body (21); The steel pipe limiting mechanism (22) includes a torsion vertical shaft (221), a lifting limiting plate (222), a steering gear (223), a damping cylinder (224) and a base (225). The upper end of the torsion vertical shaft (221) is fixedly connected to the lifting limiting plate (222). The steering gear (223) is fixedly mounted on the torsion vertical shaft (221). The steering gear (223) is located above the damping cylinder (224). The damping cylinder (224) is fixedly mounted on the conveying vehicle body (21) through the base (225). The damping cylinder (224) is connected to the torsion vertical shaft (221) for damping rotation. The steering gear (223) is intermittently meshed with the gear set (218). The one-way circulation hydraulic system (23) comprises a circulation base (231), a piston rod (232), a top plate (233), a spring (234), an injection check valve (235), a hydraulic pump (236), an oil storage tank group (237), a discharge check valve (238) and a circulation chamber (239). The circulation base (231) is fixedly mounted on the transport vehicle body (21). A circulation chamber (239) is provided inside the circulation base (231). The piston rod (232) is mounted in the circulation chamber (239). ), a top plate (233) is fixedly mounted on the upper end of the piston rod (232), the top plate (233) is elastically mounted above the circulation base (231) via a spring (234), a circulation chamber (239) provided inside the circulation base (231) is connected to a hydraulic pump (236) via an injection one-way valve (235), the hydraulic pump (236) is connected to an oil storage tank group (237), and the oil storage tank group (237) is connected to the circulation chamber (239) via at least three of the discharge one-way valves (238); The adaptive mandrel device (24) includes a supporting mandrel (241), an oil hole (242), a pressure plate (243), an expansion sleeve (244) and a flange (245). The supporting mandrel (241) is evenly distributed with oil holes (242). The supporting mandrel (241) is fixedly connected to the expansion sleeve (244) through the pressure plate (243). The expansion sleeve (244) is fixedly connected to the flange (245). One end of the flange (245) and the supporting mandrel (241) is fixedly connected to the circulation base (231), and the circulation cavity (239) provided inside the circulation base (231) is communicated with the supporting mandrel (241).

2. The high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe according to claim 1, characterized in that: The conveying body (21) comprises a body (211), supporting legs (212), a screw slot (213), a ball screw (214), a driving motor (215), a ball nut (216) and a conveying platform (217). Support legs (212) are symmetrically fixedly installed on both sides below the body (211). Two screw slots (213) are symmetrically opened above the body (211). A ball screw (214) is rotatably installed in the screw slot (213). Either end of the ball screw (214) rotates through the screw slot (213) and passes through the body (211) to be fixedly connected to the output end of the driving motor (215) fixedly installed outside the body (211). A ball nut (216) is installed on the ball screw (214), and the ball nut (216) is fixedly connected to the conveying platform (217). Gear teeth (218) are respectively installed on both sides of the conveying platform (217).

3. The high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe according to claim 1, characterized in that: The lifting and limiting plate (222) is composed of a lifting portion and a transverse plate portion. The lifting portion of the lifting and limiting plate (222) is an arc-shaped structure. The lifting and limiting plate (222) is located below the adaptive mandrel device (24).

4. The high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe according to claim 2, characterized in that: The number of teeth provided in the gear set (218) allows the steering gear (223) to rotate ninety degrees. The steering gear (223) and the gear set (218) are on the same horizontal line. The steering gear (223) is located on both sides of the vehicle body (211).

5. The high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe according to claim 1, characterized in that: The circulation chamber (239) provided inside the circulation base (231) is a "T"-shaped cavity, which is composed of a vertical cavity portion and a horizontal cavity portion. The horizontal cavity portion of the circulation chamber (239) is connected to the support core rod (241) and the injection one-way valve (235). A piston rod (232) is installed in the vertical cavity portion of the circulation chamber (239), and a spring (234) is sleeved on the outside of the upper end of the piston rod (232).

6. The high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe according to claim 1, characterized in that: The oil storage tank group (237) is a tank group consisting of at least three oil tanks, each of which is connected via a solenoid valve, and a heat dissipation fin is installed on the outside of the oil tank. The oil tanks are all connected to the discharge one-way valve (238), and the lowest oil tank is also connected to the hydraulic pump (236).

7. The high-precision cold drawing equipment for high-strength, high-toughness, corrosion-resistant stainless steel seamless pipe according to claim 1, characterized in that: The supporting core rod (241) is located inside the expansion sleeve (244), and one end of the expansion sleeve (244) is fixedly connected to the supporting core rod (241) via the pressure plate (243).

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