Cooling device of steel wire rod high-speed drawing die

Abstract

The invention relates to the technical field of steel wire rod production, in particular to a cooling device of a steel wire rod high-speed drawing die. Comprising limiting assemblies symmetrically arranged on the two sides of a rack and a cooling assembly horizontally installed in a middle cooling groove. The cooling assembly is formed by coaxially sleeving a drawing die on an oil cooling sealing cavity, a spiral inner cooling blade with a specific angle is arranged on the inner wall of the cavity, and a reversely spiral outer cooling blade is arranged on the outer wall of the cavity, so that reverse flow and efficient collaborative heat exchange of cooling oil and cooling water are realized; the device adopts a dynamic compensation structure of a conical sealing ring and a disc spring, the problem of sealing failure caused by thermal expansion is effectively solved, zero leakage is ensured, a reversing assembly is matched with a V-shaped deviation rectifying wheel through an immersed reversing wheel, and it is ensured that a steel wire is uniformly cooled in the whole process; the device significantly improves the heat dissipation efficiency and service life of the die, and eliminates the surface oxidation defect of the steel wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel wire rod production, and particularly relates to a cooling device for a high-speed drawing die of a steel wire rod. BACKGROUND

[0002] The cooling device for the high-speed drawing die of the steel wire rod is a core equipment in metal wire processing, and is mainly used for forcibly cooling the die in the high-speed drawing process of the steel wire. The device continuously leads out the heat generated by the friction between the die and the steel wire through circulating cooling medium, so that the temperature of the die is stably ensured in a reasonable range, thereby ensuring the continuity of the drawing process, the size precision and the surface quality of the steel wire; in the modern production line, the performance directly affects the mechanical properties of the steel wire and the service life of the die.

[0003] The current traditional cooling device faces two technical bottlenecks: insufficient cooling efficiency and poor sealing reliability. During high-speed drawing, the severe friction between the steel wire and the die can make the local temperature of the die instantaneously exceed 200 degrees Celsius, and the existing system mainly depends on a single cooling mode. If oil cooling is adopted, although leakage can be avoided, the low thermal conductivity coefficient leads to slow heat dissipation, and the long-term thermal fatigue of the die causes micro cracks, and the service life is sharply reduced from the normal 90 days to 30 days. If water cooling is adopted, although the heat exchange efficiency is high, the sealing defects are prone to leakage, and the cooling water seeping into the working area of the die can cause the oxidation and decarburization of the surface of the steel wire, resulting in the leakage of the subsequent galvanizing process and causing significant economic losses. More seriously, the difference in thermal expansion between the die and the cooling cavity material makes the radial deformation difference between the two in the working state exceed 0.05 mm, and the traditional flange sealing cannot dynamically compensate, and the cooling oil leaks and mixes with the cooling water to form an emulsion, which not only pollutes the system, but also leaves an oil film on the surface of the steel wire, resulting in lubrication failure. These problems are particularly prominent when the drawing speed exceeds 15 m / s, forcing enterprises to reduce the speed of the production line and sacrifice productivity. Although the industry has tried to increase auxiliary cooling or improve the sealing, the complex structure is difficult to maintain, or the response lag cannot match the transient thermal shock, and the technical difficulties of high temperature and leakage have not been overcome.

[0004] Therefore, the present application provides a cooling device for a high-speed drawing die of a steel wire rod to solve the problems in the background art. SUMMARY

[0005] The purpose of the present application is to provide a cooling device for a high-speed drawing die of a steel wire rod, which solves the problems of the existing cooling device, such as the sharp reduction of the service life of the die due to the insufficient cooling efficiency of a single medium, the leakage of the cooling medium caused by the fact that the sealing structure cannot compensate for the difference in thermal expansion, and the oxidation of the surface of the steel wire and the abnormal wear of the die.

[0006] To solve the above technical problems, the application provides a cooling device for a high-speed drawing die of a steel wire rod, comprising a rack, limit components symmetrically arranged on both sides of a rack table of the rack, the limit components being used for steel wire straightening and tension control, a cooling groove fixedly arranged in the middle of the rack, a cooling component horizontally arranged inside the cooling groove, and a central axis of the cooling component being parallel to a horizontal plane; The cooling component comprises an oil-cooling sealing cavity and a drawing die coaxially sleeved, a first helical inner cooling blade is arranged on an inner wall of the oil-cooling sealing cavity, a second helical outer cooling blade is arranged on an outer wall of the oil-cooling sealing cavity, and the second helical direction is opposite to the first helical direction. Sealing flanges are mounted at both ends of the oil-cooling sealing cavity, a conical ring groove is formed in the sealing flange, a conical sealing ring is adaptively mounted in the conical ring groove, a conical bottom surface of the conical sealing ring abuts against a disc spring, and the disc spring is sleeved on an outer wall of the drawing die and located between the conical sealing ring and a stepped surface of the die. Water inlets and outlets are formed in side walls of the cooling groove, reversing components are arranged at both sides of the oil-cooling sealing cavity in the cooling groove, the reversing components and the oil-cooling sealing cavity are coaxially distributed, and the reversing components are used for guiding the steel wire into or out of the cooling groove.

[0007] Further improvement of the technical scheme of the application is that a helical lead angle of the inner cooling blade is 30°±2°, a helical lead angle of the outer cooling blade is 45°±2°, the inner cooling blade extends along the whole length of the inner wall of the oil-cooling sealing cavity, and the outer cooling blade covers more than 80% of an outer peripheral surface of the oil-cooling sealing cavity.

[0008] Further improvement of the technical scheme of the application is that an inner conical surface of the conical sealing ring and an outer wall of the drawing die form a radial gap of 0.05-0.08 mm in a normal-temperature assembly state, the gap is filled with high-temperature sealing grease and sealed by a pre-tightening force of the disc spring, and a pre-compression amount of the disc spring is 15%-18% of a free height of the disc spring.

[0009] Further improvement of the technical scheme of the application is that the oil-cooling sealing cavity is fixed to a bottom surface of the cooling groove through a base, a ceramic heat insulation gasket is arranged between the base and the bottom surface of the cooling groove, the sealing flanges at both ends of the oil-cooling sealing cavity are each provided with an oil inlet and an oil outlet, the oil inlet of the first-end sealing flange is connected with an external oil supply pipe, the oil outlet of the second-end sealing flange is connected with an external oil return pipe, and an oil flow direction is matched with a helical direction of the inner cooling blade.

[0010] Further improvement of the technical scheme of the application is that the conical sealing ring is made of a flexible graphite matrix composite with 30-40 vol% of stainless steel wire mesh reinforcement, and a surface of the sealing ring is coated with a 0.03-0.05 mm thick molybdenum disulfide coating.

[0011] The further improvement of the technical scheme of the present application is that the reversing assembly comprises a fixing frame fixed vertically on the bottom of the cooling tank, a rotatable reversing wheel is installed on the top of the fixing frame, the reversing wheel is immersed in the cooling water and is used to reverse the steel wire from the horizontal state above the cooling tank to the horizontal state at the bottom of the cooling tank, and the lowest point of the reversing wheel is at least 50 mm lower than the liquid level of the cooling water.

[0012] The further improvement of the technical scheme of the present application is that a deviation rectifying frame is hingedly connected coaxially with the reversing wheel on the fixing frame, a deviation rectifying wheel is installed at the end of the deviation rectifying frame, and the distance between the rim of the deviation rectifying wheel and the rim of the reversing wheel is less than the diameter of the steel wire and forms a V-shaped guide channel.

[0013] The further improvement of the technical scheme of the present application is that the limiting assembly comprises a lifting frame fixed on the table top, a lifting mounting block is arranged on the lifting frame, a screw is vertically connected to the top of the mounting block, and a hand wheel is arranged on the top of the screw; two straightening rollers arranged in an up-down manner are installed on the side surface of the mounting block, the shaft ends of the straightening rollers are fixedly connected with intermeshing gears, and the outer ends of the gears are coaxially provided with pulleys.

[0014] The further improvement of the technical scheme of the present application is that the pulleys of the two groups of limiting assemblies are connected by a transmission belt to realize synchronous driving of the same motor, and the two straightening rollers of the same limiting assembly are reversely rotated.

[0015] The further improvement of the technical scheme of the present application is that the cooling tank is fixed in the middle of the rack and is located between the two limiting assemblies, the water inlet is arranged on the side wall of the bottom of the cooling tank and faces the starting end of the outer cooling blade, the water outlet is arranged on the side wall of the top of the cooling tank and faces the ending end of the outer cooling blade, and the flow direction of the cooling water matches the rotation direction of the helical blade on the outer wall of the oil cooling sealing cavity.

[0016] By adopting the above technical scheme, the present application has the following beneficial effects: 1. The cooling device of the steel wire rod high-speed drawing die provided by the present application realizes efficient and cooperative heat exchange of oil and water double media through the cooperative layout of the first helical inner cooling blade on the inner wall of the oil cooling sealing cavity and the reverse helical outer cooling blade on the outer wall. The cooling oil forms high-speed turbulent flow under the forced flow of the helical inner blade, directly washes the high-temperature area of the die, and the cooling water flows in the reverse direction along the outer helical channel. The double-circulation system completely eliminates the heat accumulation phenomenon of the die, stably controls the working temperature of the die in the safety range, and greatly prolongs the service life of the die.

[0017] 2. The cooling device of the steel wire rod high-speed drawing die provided by the present application creatively solves the sealing failure problem caused by the thermal expansion difference through the dynamic compensation structure of the conical sealing ring and the disc spring. The normal-temperature assembly gap ensures the rapid replacement of the die, the gap is automatically eliminated to form a metal seal when the die is thermally expanded during high-temperature working, the disc spring continuously provides axial compression force, the sealing system maintains zero leakage under severe temperature change conditions, and the oxidation defects on the surface of the steel wire caused by the pollution of the cooling oil to the cooling water are eliminated.

[0018] 3. The cooling device of the high-speed drawing die for steel wire rod provided by the present application, which builds a stable underwater passing path for the steel wire through the cooperation design of the reversing wheel with a submerged depth of 50 mm and the V-shaped deviation correction channel. The reversing wheel changes the steel wire from horizontal water entry to horizontal water exit, and the whole process is submerged in the cooling water. The deviation correction wheel automatically corrects the position of the steel wire, ensures uniform cooling of the surface of the steel wire, and eliminates mechanical property fluctuations caused by local overheating.

[0019] 4. The cooling device of the high-speed drawing die for steel wire rod provided by the present application, which accurately controls the flatness and tension of the steel wire before it enters the cooling system through the symmetrical layout and synchronous driving mechanism of the bidirectional straightening rollers in the limiting assembly. The upper and lower straightening rollers rotate in opposite directions to form a powerful straightening field, which cooperates with the synchronous transmission system of the belt pulley to effectively suppress the lateral vibration of the steel wire during high-speed operation, providing stable basic conditions for the cooling process.

[0020] 5. The cooling device of the high-speed drawing die for steel wire rod provided by the present application, which maximizes the heat exchange efficiency through the spatial matching design of the cooling water inlet and outlet and the rotation direction of the spiral blade. The water inlet is precisely aligned with the starting end of the outer spiral blade to inject cold water, and the water outlet is from the end of the blade to guide out hot water. The rotation direction of the water flow is completely consistent with the direction of the blade, forming a high-efficiency convection heat exchange system, which significantly reduces the cooling water consumption. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a whole schematic diagram of the cooling device of the high-speed drawing die for steel wire rod. Figure 2 It is Figure 1 an enlarged schematic diagram of part A; Figure 3 It is Figure 1 another whole structure schematic diagram; Figure 4 It is Figure 1 the front view of Figure 5 It is Figure 1 the top view of Figure 6 It is Figure 1 the sectional view of Figure 7This is a schematic diagram of the cooling assembly and commutation assembly of the present invention; Figure 8 for Figure 7 A schematic diagram of the overall structure from another angle; Figure 9 for Figure 8 Enlarged schematic diagram of part B in the middle; Figure 10 for Figure 7 Top view; Figure 11 for Figure 7 A sectional view; Figure 12 for Figure 11 An enlarged schematic diagram of section C.

[0023] Reference numerals: 1. Stand; 2. Limiting assembly; 21. Lifting frame; 22. Mounting block; 23. Straightening roller; 24. Gear; 25. Handwheel; 26. Pulley; 27. Transmission belt; 28. Motor; 3. Cooling tank; 31. Inlet; 32. Outlet; 4. Cooling assembly; 401. Base; 402. Oil-cooled sealing cavity; 403. Sealing flange; 404. Inner cooling blade; 405. Outer cooling blade; 406. Oil inlet; 407. Oil outlet; 408. Ring groove; 409. Conical sealing ring; 410. Disc spring; 411. Mold; 5. Reversing assembly; 51. Fixing frame; 52. Reversing wheel; 53. Straightening frame; 54. Straightening wheel. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The present invention will be further explained below with reference to specific embodiments.

[0028] like Figures 1-3 As shown, the cooling device for a high-speed wire rod drawing die provided in this embodiment includes a frame 1. Limiting components 2 are symmetrically arranged on both sides of the table surface of the frame 1. The limiting components 2 are used for wire straightening and tension control. A cooling tank 3 is fixedly arranged in the middle of the frame 1. A cooling component 4 is horizontally arranged inside the cooling tank 3. The central axis of the cooling component 4 is parallel to the horizontal plane.

[0029] like Figures 1-12 As shown, in this embodiment, the cooling assembly 4 includes a coaxially fitted oil-cooled sealing cavity 402 and a drawing die 411. The inner wall of the oil-cooled sealing cavity 402 is provided with a first-direction spiral inner cooling blade 404, and the outer wall of the oil-cooled sealing cavity 402 is provided with a second-direction spiral outer cooling blade 405, the second direction of rotation being opposite to the first direction of rotation. The spiral lead angle of the inner cooling blade 404 is 30°±2°, and the spiral lead angle of the outer cooling blade 405 is 45°±2°. The inner cooling blade 404 extends along the entire length of the inner wall of the oil-cooled sealing cavity 402, and the outer cooling blade 405 covers more than 80% of the outer circumferential surface of the oil-cooled sealing cavity 402. This cooling device achieves efficient synergistic heat exchange between oil and water media through the coordinated arrangement of the first-direction spiral inner cooling blade 404 on the inner wall of the oil-cooled sealing cavity 402 and the opposite-direction spiral outer cooling blade 405 on the outer wall. The counter-rotating design of the inner and outer blades creates a strong shear flow field within the cavity, significantly enhancing the convective heat transfer coefficient between the cooling oil and the mold 411 wall, and between the cooling water and the outer wall of the sealed cavity. The cooling oil forms a high-speed turbulent flow under the forced guidance of the spiral inner cooling blades 404, directly scouring the high-temperature area of ​​the mold 411, while the cooling water flows in the opposite direction along the outer spiral channel. This dual-circulation system completely eliminates the heat accumulation phenomenon in the mold 411, ensuring that the working temperature of the mold 411 is stably controlled within a safe range, and greatly extending the service life of the mold 411.

[0030] like Figures 7-12As shown, in the embodiment, the oil-cooled sealing cavity 402 is provided with sealing flanges 403 at both ends, a tapered ring groove 408 is formed in the sealing flanges 403, a tapered sealing ring 409 is fitted and installed in the tapered ring groove 408, the tapered bottom surface of the tapered sealing ring 409 abuts against a disc spring 410, the disc spring 410 is sleeved on the outer wall of a drawing die 411 and located between the tapered sealing ring 409 and the stepped surface of the die 411; the inner tapered surface of the tapered sealing ring 409 and the outer wall of the drawing die 411 form a radial gap of 0.05-0.08mm in the normal temperature assembly state, the gap is filled with high-temperature sealing grease and sealed by the pre-tightening force of the disc spring 410, the pre-compression amount of the disc spring 410 is 15%-18% of the free height, and the pre-compression amount is set to ensure that the disc spring 410 can provide stable and sufficient compensation force in the working temperature range, so as to avoid sealing failure caused by stress relaxation. The bottom of the oil-cooled sealing cavity 402 is fixed to the bottom surface of the cooling tank 3 through a base 401, and a ceramic heat insulation gasket is arranged between the base 401 and the bottom surface of the cooling tank 3; the ceramic heat insulation gasket effectively blocks the heat transfer from the oil-cooled sealing cavity 402 to the cooling tank 3, and maintains the stable cooling water temperature of the oil-cooled sealing cavity 402. The sealing flanges 403 at both ends are respectively provided with an oil inlet 406 and an oil outlet 407, the oil inlet 406 of the first end sealing flange 403 is connected with an external oil supply pipe, the oil outlet 407 of the second end sealing flange 403 is connected with an external oil return pipe, and the oil flow direction is matched with the rotation direction of the inner cooling blade 404. The tapered sealing ring 409 is made of a flexible graphite matrix composite with 30-40vol% stainless steel wire mesh reinforcement, and the surface of the tapered sealing ring 409 is coated with a 0.03-0.05mm thick molybdenum disulfide coating. The flexible graphite matrix gives the sealing ring elastic deformation capability, and the stainless steel wire mesh reinforcement increases the compression strength, so that the tapered sealing ring 409 maintains structural integrity under thermal expansion. The cooling device creatively solves the sealing failure problem caused by thermal expansion difference through the dynamic compensation structure of the tapered sealing ring 409 and the disc spring 410. The normal temperature assembly gap ensures quick replacement of the die 411, the thermal expansion of the die 411 automatically eliminates the gap to form a metal seal during high-temperature work, the disc spring 410 continuously provides axial compression force, so that the sealing system maintains zero leakage under severe temperature change conditions, and prevents the oxidation defects on the surface of the steel wire caused by the pollution of the cooling oil to the cooling water.

[0031] As Figure 1 , Figure 8 , Figure 9As shown, in this embodiment, the cooling tank 3 has an inlet 31 and an outlet 32 ​​on its sidewall. Reversing assemblies 5 are respectively installed on both sides of the oil-cooled sealing cavity 402 within the cooling tank 3. The reversing assemblies 5 and the oil-cooled sealing cavity 402 are coaxially distributed. The reversing assemblies 5 are used to guide the steel wire into or out of the cooling tank 3. The reversing assembly 5 includes a fixing frame 51 vertically fixed to the bottom of the cooling tank 3. A rotatable reversing wheel 52 is installed on the top of the fixing frame 51. The reversing wheel 52 is immersed in the cooling water and is used to reverse the steel wire from a horizontal position above the cooling tank 3 to a horizontal position at the bottom of the cooling tank 3. The lowest point of the reversing wheel 52 is at least 50mm below the cooling water surface. A correction frame 53 is coaxially hinged to the fixing frame 51 and the reversing wheel 52. A correction wheel 54 is installed at the end of the correction frame 53. The distance between the rims of the correction wheel 54 and the reversing wheel 52 is less than the diameter of the steel wire, forming a V-shaped guide channel. The cooling device, through the combined design of a reversing wheel 52 with an immersion depth of up to 50 mm and a V-shaped correction channel, constructs a stable underwater passage path for the steel wire. The reversing wheel 52 changes the steel wire from horizontal entry into the water to horizontal exit, ensuring it is fully submerged in cooling water throughout the process. The correction wheel 54 automatically corrects the position of the steel wire, ensuring uniform cooling of the steel wire surface and eliminating fluctuations in mechanical properties caused by localized overheating.

[0032] like Figure 1 , Figure 2 , Figure 5 As shown, in this embodiment, the limiting component 2 includes a lifting frame 21 fixed on the platform 1. A liftable mounting block 22 is mounted on the lifting frame 21. A screw is vertically connected to the top of the mounting block 22, and a handwheel 25 is mounted on the top of the screw. Two vertically arranged straightening rollers 23 are mounted on the side of the mounting block 22. The shaft ends of the straightening rollers 23 are fixedly connected to meshing gears 24, and pulleys 26 are coaxially mounted on the outer ends of the gears 24. The pulleys 26 of the two sets of limiting components 2 are connected to the same motor 28 via a transmission belt 27 for synchronous drive. The two straightening rollers 23 of the same limiting component 2 rotate in opposite directions. Using a single motor 28 to synchronously drive the two straightening rollers 23 via the transmission belt 27 ensures that the traction force on the steel wire is strictly symmetrical when entering and leaving the cooling system, avoiding uneven tension or wire slippage caused by speed differences on both sides. This cooling device, through the symmetrical layout of the bidirectional straightening rollers 23 in the limiting component 2 and the synchronous drive mechanism, precisely controls the straightness and tension of the steel wire before it enters the cooling system. The upper and lower straightening rollers 23 rotate in opposite directions to create a powerful straightening field. Combined with the synchronous transmission system of the pulleys 26, this effectively suppresses the lateral vibration of the steel wire during high-speed operation, providing a stable foundation for the cooling process. like Figure 1 , Figure 2 , Figure 7As shown, in this embodiment, the cooling tank 3 is fixed in the middle of the frame 1 and located between the two limiting components 2. The water inlet 31 is located on the bottom side wall of the cooling tank 3 and faces the starting end of the external cooling blades 405. The water outlet 32 ​​is located on the top side wall of the cooling tank 3 and faces the ending end of the external cooling blades 405. The cooling water flow direction matches the rotation direction of the spiral blades on the outer wall of the oil-cooled sealing cavity 402. The bottom water inlet and top water outlet layout conforms to the convection principle of hot water rising naturally, which helps to accelerate the cooling water circulation speed. This cooling device maximizes the heat exchange efficiency through the spatial matching design of the cooling water inlet and outlet with the rotation direction of the spiral blades. The water inlet 31 is precisely aligned with the starting end of the external cooling blades 405 to inject cold water, and the water outlet 32 ​​leads out hot water from the ending end of the blades. The water flow rotation direction is completely consistent with the guiding direction of the external cooling blades 405, forming a highly efficient convection heat exchange system and significantly reducing the cooling water consumption.

[0033] The present invention also provides the working principle of a cooling device for a high-speed wire rod drawing die: The wire rod first passes through the limiting assembly 2 on the frame 1. The operator can initially straighten and guide the wire rod by turning the handwheel 25 to change the position of the straightening roller 23 on the mounting block 22. Then the wire rod enters the cooling tank 3 filled with cooling water and passes through the drawing die 411 located in the tank. The die 411 is precisely installed in the oil-cooled sealing cavity 402. A reliable seal is achieved by the sealing flange 403 and the conical sealing ring 409 in conjunction with the preload provided by the disc spring 410. During room temperature assembly, a small gap is reserved between the conical sealing ring 409 and the outer wall of the die 411, and the disc spring 410 provides the initial preload. When the die 411 is drawn at high speed and heated, its radial expansion increases significantly. The outer wall of the die 411 strongly compresses the inner conical surface of the conical sealing ring 409, forcing the flexible composite material sealing ring to expand radially, so that its outer conical surface fits tightly with the conical ring groove 408 of the oil-cooled sealing cavity 402. Meanwhile, the axial preload of the disc spring 410 is converted into a continuously increasing radial sealing pressure through the conical structure. This design ensures that thermal expansion not only does not weaken the seal but also enhances the sealing contact pressure. During cooling contraction, the disc spring 410 can also push the sealing ring to reset and compensate for the gap. Ultimately, under severe temperature change conditions, dynamic zero-leakage sealing of the cooling oil chamber is achieved. Circulating cooling oil is pumped into the oil-cooled sealed cavity 402 through the oil inlet 406. Under the forced drive of the 30° spiral channel constructed by the inner cooling blades 404, it forms a high-speed turbulent flow, directly scouring the high-temperature surface of the mold 411 and efficiently absorbing its heat. At the same time, cooling water is injected from the bottom inlet 31 of the cooling tank 3 and flows in the opposite direction along the 45° reverse spiral channel designed by the outer cooling blades 405. This dual-circulation structure has two advantages: first, the countercurrent flow of the inner and outer media forms a strong countercurrent heat exchange, with the high-temperature oil outlet facing the cold water inlet area, maximizing the temperature gradient and improving heat exchange efficiency; second, the difference in blade rotation direction causes eddy interference, and the rotating oil flow generated by the inner cooling blades 404 and the rotating water flow guided by the outer cooling blades 405 generate shear disturbances on the cavity wall, significantly enhancing the thermal boundary layer disruption. Ultimately, triple heat transfer is achieved: the oil flow directly cools the core of the mold 411, the water flow quickly removes the heat from the outer wall of the oil-cooled sealing cavity 402, and the metal of the oil-cooled sealing cavity 402 itself becomes a highly efficient heat conduction medium, so that the heat in the working area of ​​the mold 411 is absorbed by the oil and water dual media in relay, completely eliminating the phenomenon of local heat accumulation; after the mold 411 is cooled, the wire rod finally passes through the reversing assembly 5, and the reversing wheel 52 supported by the fixed frame 51 changes its direction of travel, and the correction wheel 54 on the correction frame 53 can be used for fine angle adjustment to ensure smooth and straight material output.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling device for a high speed wire rod drawing die, characterized in that: The rack (1) is provided with a limiting assembly (2) on both sides of the platform symmetrically, which is used for steel wire straightening and tension control, and a cooling groove (3) is fixedly arranged in the middle of the rack (1), and a cooling assembly (4) is horizontally arranged in the cooling groove (3), and the central axis of the cooling assembly (4) is parallel to the horizontal plane. The cooling assembly (4) comprises an oil-cooled sealing cavity (402) and a drawing die (411) coaxially sleeved, the inner wall of the oil-cooled sealing cavity (402) is provided with first-rotation spiral inner cooling blades (404), and the outer wall of the oil-cooled sealing cavity (402) is provided with second-rotation spiral outer cooling blades (405), and the second rotation is opposite to the first rotation. Sealing flanges (403) are mounted at both ends of the oil-cooled sealing cavity (402), a conical ring groove (408) is formed in the sealing flange (403), a conical sealing ring (409) is fitted and mounted in the conical ring groove (408), the conical bottom surface of the conical sealing ring (409) abuts against a disc spring (410), and the disc spring (410) is sleeved on the outer wall of the drawing die (411) and located between the conical sealing ring (409) and the die step surface. A water inlet (31) and a water outlet (32) are formed in the side wall of the cooling groove (3), and a reversing assembly (5) is arranged on both sides of the oil-cooled sealing cavity (402) in the cooling groove (3), and the reversing assembly (5) and the oil-cooled sealing cavity (402) are coaxially distributed, and the reversing assembly (5) is used for guiding the steel wire into or out of the cooling groove (3).

2. A cooling device for high speed drawing dies of steel wire rod as claimed in claim 1, wherein: The spiral lead angle of the inner cooling blades (404) is 30°±2°, and the spiral lead angle of the outer cooling blades (405) is 45°±2°; the inner cooling blades (404) extend along the full length of the inner wall of the oil-cooled sealing cavity (402), and the outer cooling blades (405) cover more than 80% of the outer peripheral surface of the oil-cooled sealing cavity (402).

3. A cooling device for high speed drawing dies of steel wire rod as claimed in claim 1, wherein: The inner conical surface of the conical sealing ring (409) and the outer wall of the drawing die (411) form a radial gap of 0.05-0.08mm in the normal temperature assembly state, the gap is filled with high temperature sealing grease and sealed by the pre-tightening force of the disc spring (410), and the pre-compression amount of the disc spring (410) is 15%-18% of the free height.

4. A cooling device for high speed drawing die of steel wire rod as claimed in claim 1, wherein: The bottom of the oil-cooled sealing cavity (402) is fixed to the bottom surface of the cooling groove (3) through a base (401), and a ceramic heat insulation gasket is arranged between the base (401) and the bottom surface of the cooling groove (3); the sealing flanges (403) at both ends of the oil-cooled sealing cavity (402) are respectively provided with an oil inlet (406) and an oil outlet (407), the oil inlet (406) of the first end sealing flange (403) is connected with an external oil supply pipe, and the oil outlet (407) of the second end sealing flange (403) is connected with an external oil return pipe, and the oil flow direction matches the rotation direction of the inner cooling blades (404).

5. A cooling device for high speed drawing die of steel wire rod as claimed in claim 1 wherein: The conical sealing ring (409) is made of a flexible graphite matrix composite with 30-40vol% stainless steel wire mesh reinforcement, and the surface of the sealing ring is coated with a 0.03-0.05mm thick molybdenum disulfide coating.

6. A cooling device for high speed drawing dies of steel wire rod as claimed in claim 1, wherein: The reversing assembly (5) comprises a fixed frame (51) fixed vertically on the bottom of the cooling tank (3), a rotatable reversing wheel (52) mounted on the top of the fixed frame (51), and the reversing wheel (52) is immersed in the cooling water and used to reverse the steel wire from the horizontal state above the cooling tank (3) to the horizontal state at the bottom of the cooling tank (3); the lowest point of the reversing wheel (52) is at least 50mm lower than the liquid level of the cooling water.

7. A cooling device for high speed drawing dies for steel wire rod according to claim 6, characterized in that: The fixed frame (51) is coaxially hinged with a deviation rectifying frame (53), the deviation rectifying frame (53) is mounted with a deviation rectifying wheel (54) at the end, and the deviation rectifying wheel (54) is spaced from the rim of the reversing wheel (52) by a distance less than the diameter of the steel wire and forms a V-shaped guide channel.

8. A cooling device for high speed drawing dies of steel wire rod as claimed in claim 1, wherein: The limiting assembly (2) comprises a lifting frame (21) fixed on the table top (1), a lifting mounting block (22) arranged on the lifting frame (21), a screw vertically connected at the top of the mounting block (22), a hand wheel (25) arranged at the top of the screw; two straightening rollers (23) arranged in an up-down manner on the side of the mounting block (22), gear wheels (24) fixedly connected at the shaft ends of the straightening rollers (23) and meshed with each other, and pulleys (26) coaxially arranged at the outer ends of the gear wheels (24).

9. A cooling device for high speed drawing dies for steel wire rod according to claim 8, characterized in that: The pulleys (26) of the two groups of limiting assemblies (2) are connected by a transmission belt (27) to realize synchronous driving by the same motor (28), and the two straightening rollers (23) of the same limiting assembly (2) are opposite in direction.

10. A cooling device for high speed drawing dies of steel wire rod as claimed in claim 1, wherein: The cooling tank (3) is fixed in the middle of the rack (1) and located between the two limiting assemblies (2), the water inlet (31) is arranged on the side wall of the bottom of the cooling tank (3) and faces the starting end of the outer cooling blade (405), the water outlet (32) is arranged on the side wall of the top of the cooling tank (3) and faces the ending end of the outer cooling blade (405), and the cooling water flow direction matches the rotation direction of the spiral blade of the oil-cooled sealed cavity (402).

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