Corrosion-resistant ball valve forge piece made of duplex stainless steel and manufacturing process of corrosion-resistant ball valve forge piece

Abstract

The invention discloses a corrosion-resistant ball valve forge piece made of a duplex stainless steel material and a manufacturing process, and relates to the technical field of ball valves. The corrosion-resistant ball valve forge piece made of the duplex stainless steel material comprises a valve body, and a liquid control device is arranged at the bottom of the valve body; the liquid control device comprises a pipe body, a first opening and closing piece and a second opening and closing piece are arranged in the pipe body, and the transverse plate is connected with the side, close to the second opening and closing piece, of the first opening and closing piece through a first spring and a second spring. According to the corrosion-resistant ball valve forge piece made of the duplex stainless steel material and the manufacturing process, a pipeline is divided into a plurality of cavities through a plurality of opening and closing pieces, under the combined action of elasticity and gravity, opening and closing of the opening and closing pieces are controlled, excessive substances accumulated in gaps are discharged in time, the discharging time is recorded, and the reason for substance accumulation in the gaps is judged in an auxiliary mode; the duplex stainless steel forge piece with the weight being 10 tons or above is produced through the processes of ingot casting hot material charging, forging forming and hot material heat transfer treatment.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to a corrosion-resistant ball valve forging made of duplex stainless steel and a manufacturing process thereof. Background Art

[0002] Ball valve forgings are ball valve parts processed by forging technology. The ball valve relies on the rotating valve stem to drive the ball to realize the opening and closing of the valve and control the flow of the fluid. There is a cavity between the valve body and the ball.

[0003] With reference to Chinese Patent Publication No.: CN109140013A, a new type of ball valve end cover forging comprises an integrally formed end cover, the end cover comprises an end cover body, a support member is arranged on the top of the end cover body, and a reinforcement body is arranged at the connection between the support member and the end cover body, a screw block matching with the valve body is arranged on the bottom of the end cover body, and a positioning groove is arranged on the outer side of the screw block, a side wall of the positioning groove close to the end cover body is arranged as a positioning end face, a sealing groove is arranged on the positioning end face, a receiving groove matching with the valve core is longitudinally arranged in the inner cavity of the screw block, a hollow groove matching with the valve stem is longitudinally arranged in the inner cavity of the support member, the receiving groove and the hollow groove are connected by a limiting groove, and a screw hole is arranged in the circumferential direction of the top of the support member, which can realize rapid positioning while improving the convenience of installation and the sealing effect between the valve body and the end cover.

[0004] If there is a certain inclination at the bottom of the valve body, the solution will easily flow to the bottom of the valve body and accumulate under the action of gravity. This is especially common in some non-horizontally installed pipeline systems; when the viscosity of the fluid in the pipeline is high and the flow rate is low, the fluidity of the solution is poor and it is easy to form accumulation at the bottom of the valve body. For example, in some pipelines that transport high-viscosity grease or colloidal substances, when the ball rotates, the solution cannot be carried away with the main flow of the fluid in time, and it will gradually accumulate at the bottom of the valve body; if the fluid medium contains solid impurities, particles or fibers and other substances, these impurities may precipitate and accumulate at the bottom of the valve body. As time goes by, the accumulated impurities will become more and more, and may even affect the normal operation of the valve; when the sealing performance of the ball valve decreases and leakage occurs, even if the ball is in the closed state, a small amount of solution will leak from the gap between the ball and the valve seat or other sealing parts to the bottom of the valve body, and long-term accumulation will form solution accumulation. The material accumulated at the bottom of the valve body will increase the resistance to the rotation of the ball and increase the force required to operate the valve. The material accumulated at the bottom of the valve body may be sandwiched between the ball and the valve seat, making it impossible for the two to fit tightly, destroying the integrity of the sealing surface, and increasing the wear of the ball and the valve seat, reducing the sealing effect of the valve, and thus affecting the sealing and stability of the entire system; the valve body, valve cover, and ball of large-size forgings (above 10 tons) ball valves are generally made of carbon steel and austenitic stainless steel. In order to ensure the corrosion resistance of the valve body, duplex stainless steel is finally welded on the surface. Since this structure is a welding structure of two materials, there are defects such as desoldering and delamination. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a corrosion-resistant ball valve forging made of duplex stainless steel and a manufacturing process, in which a pipeline is divided into multiple cavities by a plurality of opening and closing parts. Under the joint action of elasticity and gravity, the opening and closing of the opening and closing parts are controlled, so that excessive substances accumulated in the gap can be discharged in time and the discharge time can be recorded, thereby assisting in determining the cause of the accumulation of substances in the gap.

[0006] Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solution: A corrosion-resistant forging made of duplex stainless steel, comprising: a valve body, a bottom hole is formed through the bottom of the valve body, a liquid control device is arranged in the bottom hole, the liquid control device comprises: a tube body, the side of the tube body is connected to the inner wall of the bottom hole, a first opening and closing piece, a second opening and closing piece, and a cross plate are arranged in the tube body, the two sides of the cross plate are respectively connected to the side close to the first opening and closing piece and the second opening and closing piece through a first spring and a second spring, the first opening and closing piece is used to control the opening of the cavity and discharge the substance accumulated in the cavity, and the second opening and closing piece is used to control the opening of the tube body and discharge the substance accumulated in the tube body.

[0007] A corrosion-resistant ball valve made of duplex stainless steel comprises: a corrosion-resistant forging made of duplex stainless steel and a liquid control device, wherein the liquid control device is connected to the inner wall of a bottom hole, a sphere is arranged in the valve body, a gap is arranged between the sphere and the valve body, the gap is connected to one end of the bottom hole, valve seats are symmetrically arranged on the left and right sides of the valve body, a handle is connected to the top of the sphere through a valve stem, a rotation sensor is connected to the upper surface of the handle, the rotation sensor is used to monitor the rotation of the handle in real time, the rotation sensor is electrically connected to a timer through a wire, and the timer cooperates with the rotation sensor to obtain the start and end time of the handle rotation and the interval time between two adjacent rotations.

[0008] Preferably, the liquid control device also includes: a first cavity, the first cavity is opened in the middle and upper part of the tube body, the lower part of the tube body is opened with a second cavity and is connected to the first cavity, the first opening and closing piece is arranged at the top of the first cavity, the second opening and closing piece is arranged at the bottom of the first cavity, one side of the horizontal plate is connected to the inner wall of the lower part of the first cavity, the top of the horizontal plate is connected to the first opening and closing piece through a first spring, and the bottom of the horizontal plate is connected to the top of the second opening and closing piece through a second spring.

[0009] Preferably, the first opening and closing member includes: a sealing ring, the side of the sealing ring is connected to the inner wall of the top of the tube body, a pressure groove is provided in the middle position of the lower surface of the sealing ring, the lower surface of the sealing ring close to the end of the tube body axis is a pressure surface, the pressure groove is clamped with an outer strip, the outer strip is connected to the inner plate through a connecting strip, a plurality of discharge holes distributed in a ring array are penetrated through the top of the connecting strip, the bottom of the sealing ring is connected to a connecting block, the bottom of the connecting block is parallel to the horizontal plane, a pressure sensor is arranged directly below the connecting block, the side of the pressure sensor is connected to the inner wall of the upper part of the tube body, the pressure sensor is used to receive the extrusion of the connecting block and obtain the starting time, ending time and duration of the extrusion.

[0010] Preferably, the inner plate is a spherical plate, the connecting strip and the outer strip are both annular strips, the lower surface of the connecting strip and the lower surface of the outer strip are in the same plane, the upper surface of the connecting strip is located below the lower surface of the outer strip, and the upper surface of the connecting strip and the upper surface of the outer strip are parallel to each other.

[0011] Preferably, the angle between the connecting strip and the vertical direction is smaller than the angle between the tangent line of the outer edge of the inner plate and the vertical direction.

[0012] Preferably, the pressing surface is matched with the upper surface of the connecting strip, and when the outer strip is engaged with the pressing groove, the pressing surface abuts against the connecting strip, the pressing surface is used to seal the discharge hole, and the pressing groove is used to seal the outer strip.

[0013] Preferably, the second opening and closing member includes: a sealing ring, which is connected to the inner wall of the lower part of the first cavity, the cross-sectional view of one end of the sealing ring after unfolding is an inverted needle shape, the side of the sealing ring away from the axis of the tube body is a side surface, and the side surface is connected to the inner wall of the first cavity, and the side of the sealing ring close to the axis of the tube body is composed of an inclined surface and an arc surface, the inclined surface is located above the arc surface, and the inner wall of the sealing ring is connected to a shift plate.

[0014] Preferably, the inclined surface and the side surface gradually shrink along the axial direction of the tube body, the curved surface and the side surface gradually shrink along the axial direction of the tube body, the distance from the top of the inclined surface to the side surface is greater than the distance from the bottom of the inclined surface to the side surface, the distance from the bottom of the inclined surface to the side surface is equal to the distance from the top of the curved surface to the side surface, and the distance from the top of the curved surface to the side surface is greater than the distance from the bottom of the curved surface to the side surface.

[0015] Preferably, the diameter of the moving plate is larger than the diameter of the bottom of the sealing ring, and the diameter of the moving plate is smaller than the diameter of the top of the sealing ring.

[0016] A process for manufacturing the corrosion-resistant forgings made of the duplex stainless steel material comprises: placing hot ingots into a furnace: preheating the forging heating furnace in advance to a temperature within a range of 100°C from the temperature of the steel ingots; immediately transferring the hot steel ingots into the forging heating furnace for heating after demoulding; and slowly heating the hot steel ingots to 1200°C.

[0017] Forging: Use a 60MN press to perform small deformation and compaction on the surface of the ingot, remove the ingot riser, and then perform upsetting and forming on the ingot, with a total of 4-5 fires.

[0018] Hot material transfer heat treatment: After manufacturing, the hot material is transferred to the heat treatment furnace for solid solution. The heat treatment furnace needs to be heated to 1100℃ in advance to keep warm.

[0019] Beneficial effects: The present invention provides a corrosion-resistant ball valve forging made of duplex stainless steel and a manufacturing process. Compared with the prior art, the present invention has the following beneficial effects: 1. The pipeline is divided into multiple cavities by the first opening and closing piece and the second opening and closing piece. Each opening and closing piece is equivalent to a valve. Under the joint action of elasticity and gravity, the opening and closing of the opening and closing piece is controlled, which can facilitate the timely discharge of excessive substances accumulated in the gap and record the discharge time, which assists in determining the cause of the accumulation of substances in the gap.

[0020] 2. The opening and closing of the first opening and closing part is controlled by the upward elastic force of the first spring and the vertical downward force of the entire plate where the inner plate is located. When the first opening and closing part is opened, it can not only discharge the excess material at the bottom of the valve body into the first cavity to keep the gap between the valve body and the ball clean, but also record the opening time and opening frequency of the first opening and closing part through the pressure sensor to assist in inferring the cause of material accumulation at the bottom of the valve body; the first cavity and the second cavity are separated by the second opening and closing part to prevent the gap from being directly connected to the second cavity or even the outside of the tube body. Multi-layer sealing forms multiple sealing barriers, which can more effectively prevent material leakage. When there is too much material in the gap, the material can be automatically discharged to the first cavity, and there is no need to worry about the first cavity being directly connected to the outside world.

[0021] 3. The top of the interior needs to extend into the gap and contact the material in the gap. In order to reduce the volume of the inner plate as much as possible while ensuring the contact area between the inner plate and the material in the gap, the inner plate is designed as a spherical plate. Compared with a flat surface, the spherical arc surface has a larger surface area and a curvature, which is more conducive to the material sliding down along the arc surface.

[0022] 4. The upper surface of the connecting strip is located below the lower surface of the outer strip. The upper surface of the connecting strip and the upper surface of the outer strip are parallel to each other, so that the top of the connecting strip is lower than the top of the outer strip. The outer strip is like a wall set outside the connecting strip, and the connecting strip is like a concave ditch, which is convenient for the material to be discharged from the discharge hole on the connecting strip and reduces the contact between the material and the outer strip. The angle between the connecting strip and the vertical direction is smaller than the angle between the tangent line of the outer edge of the inner plate and the vertical direction. The greater the inclination of the connecting strip, the more it can increase the component force when the material slides down along the surface of the connecting strip, and the more space can be accommodated between the connecting strip, the outer strip, and the top of the tube body, reducing the possibility of impurities contacting the outer strip.

[0023] 5. The controller obtains the start and end time of the handle rotation, the interval time between two adjacent rotations, the start and end time of extrusion, the duration of extrusion, and the pressure value in real time and transmits them to the plane map. The pressure value is marked on the plane map to form a pressure line. By observing the plane map, the cause of the accumulation of materials at the bottom of the valve body can be preliminarily determined. The device has a simple structure and is easy to operate.

[0024] 6. The production mode of hot ingots entering the furnace - forging - hot material transfer to heat treatment shortens the heating and heat treatment time, saves energy, shortens the entire manufacturing process, and improves production efficiency. On the other hand, this mode can avoid cracking on the surface of the steel ingot, ensure the quality of forgings, and reduce the workload of subsequent grinding and machining. It can achieve the forging of more than 10 tons of duplex stainless steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, further serve to explain the principles of the present application and enable those skilled in the relevant art to make and use the present application.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 for Figure 1 Looking up from a perspective.

[0029] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0030] Figure 4 for Figure 3 Schematic diagram of the structure of the central control liquid device and its adjacent part of the valve body and part of the ball.

[0031] Figure 5 This is a schematic diagram of the structure of the central control liquid device.

[0032] Figure 6 This is a separation diagram of the tube body and the internal structure of the tube body in the liquid control device.

[0033] Figure 7 This is a schematic diagram of the structure of the liquid control device after removing the tube body.

[0034] Figure 8 This is an exploded view of the first opening and closing part.

[0035] Fig. 9 It is a schematic diagram of the structure where the outer strip and the inner plate are located.

[0036] Fig.10 It is a schematic cross-sectional view of the portion where the outer strip and the inner plate are located.

[0037] Fig.11 A schematic cross-sectional view of a sealing ring.

[0038] Fig.12 This is an enlarged view of A.

[0039] Fig.13 It is a cross-sectional schematic diagram of the second opening and closing member.

[0040] Fig.14 This is an enlarged view of B.

[0041] The reference numerals in the figure are: 11, valve body; 12, ball; 13, valve stem; 14, handle; 15, valve seat; 21, rotation sensor; 22, wire; 23, timer; 3, liquid control device; 31, tube body; 32, first spring; 33, cross plate; 34, second spring; 35, first opening and closing piece; 351, outer strip; 352, connecting strip; 353, discharge hole; 354, inner plate; 355, pressure sensor; 356, sealing ring; 357, connecting block; 358, pressing groove; 359, pressing surface; 36, second opening and closing piece; 361, sealing ring; 362, shift plate; 363, inclined surface; 364, arc surface; 365, side surface; 37, first cavity; 38, second cavity; 4, gap; 5, bottom hole.

[0042] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0044] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] Example 1: Figure 1 - Fig.14 As shown, an embodiment of the present invention provides a corrosion-resistant forging made of duplex stainless steel, including: a valve body 11, a bottom hole 5 is formed through the bottom of the valve body 11, a liquid control device 3 is arranged in the bottom hole 5, and the liquid control device 3 includes: a tube body 31, a side 365 of the tube body 31 is connected to the inner wall of the bottom hole 5, a first opening and closing piece 35, a second opening and closing piece 36, and a cross plate 33 are arranged in the tube body 31, and the two sides of the cross plate 33 are respectively connected to the side close to the first opening and closing piece 35 and the second opening and closing piece 36 through a first spring 32, a second spring 34, the first opening and closing piece 35 is used to control the opening and closing of the cavity and discharge the substance accumulated in the cavity, and the second opening and closing piece 36 is used to control the opening and closing of the tube body 31 and discharge the substance accumulated in the tube body 31.

[0046] A corrosion-resistant ball valve made of duplex stainless steel comprises: a corrosion-resistant forging made of duplex stainless steel and a liquid control device 3, the liquid control device 3 is connected to the inner wall of a bottom hole 5, a ball 12 is arranged in a valve body 11, a gap 4 is arranged between the ball 12 and the valve body 11, the gap 4 is connected to one end of the bottom hole 5, valve seats 15 are symmetrically arranged on the left and right sides of the valve body 11, and a handle 14 is connected to the top of the ball 12 through a valve stem 13.

[0047] The gap 4 is connected to the bottom hole 5 to form a drainage channel.

[0048] The liquid control device 3 also includes: a first cavity 37, the first cavity 37 is opened in the middle and upper part of the tube body 31, a second cavity 38 is opened in the lower part of the tube body 31 and is connected to the first cavity 37, a first opening and closing member 35 is arranged at the top of the first cavity 37, and a second opening and closing member 36 is arranged at the bottom of the first cavity 37. One side of the cross plate 33 is connected to the inner wall of the lower part of the first cavity 37, the top of the cross plate 33 is connected to the first opening and closing member 35 through the first spring 32, and the bottom of the cross plate 33 is connected to the top of the second opening and closing member 36 through the second spring 34.

[0049] The first opening and closing member 35 includes: a sealing ring 356, a side surface 365 of the sealing ring 356 is connected to the inner wall of the top of the tube body 31, a pressing groove 358 is provided in the middle position of the lower surface of the sealing ring 356, and the lower surface of the sealing ring 356 close to the axis of the tube body 31 is a pressing surface 359, the pressing groove 358 is clamped with an outer strip 351, and the outer strip 351 is connected to the inner plate 354 through a connecting strip 352, and a plurality of discharge holes 353 distributed in a ring array are provided through the top of the connecting strip 352, and the bottom of the sealing ring 356 is connected to a connecting block 357, and the bottom of the connecting block 357 is parallel to the horizontal plane, and a pressure sensor 355 is arranged directly below the connecting block 357, and the side surface 365 of the pressure sensor 355 is connected to the inner wall of the upper part of the tube body 31.

[0050] The inner plate 354 is a spherical plate, the connecting strip 352 and the outer strip 351 are both annular strips, the lower surface of the connecting strip 352 and the lower surface of the outer strip 351 are in the same plane, the upper surface of the connecting strip 352 is located below the lower surface of the outer strip 351, and the upper surface of the connecting strip 352 and the upper surface of the outer strip 351 are parallel to each other.

[0051] The inner plate 354 is located between the gap 4 and the tube body 31 and is the connecting portion between the gap 4 and the tube body 31. The top of the inner plate 354 needs to extend into the gap 4 and contact with the material in the gap 4. In order to reduce the volume of the inner plate 354 as much as possible while ensuring the contact area between the inner plate 354 and the material in the gap 4, the inner plate 354 is designed as a spherical plate. Compared with a plane, the surface area of ​​the spherical arc surface 364 is larger, and the arc surface 364 has a curvature, which is also more conducive to the material sliding down along the arc surface 364.

[0052] The lower surface of the connecting strip 352 and the lower surface of the outer strip 351 are in the same plane, so that the connecting strip 352 and the outer strip 351 are a whole, and the upper surface of the connecting strip 352 and the upper surface of the outer strip 351 are parallel to each other. The connecting strip 352 and the outer strip 351 can be regarded as a completed plate body, and the connecting strip 352 is obtained by cutting off the top of one end of the plate body close to the axis of the tube body 31. The sealing ring 356 only needs to open a pressing groove 358, and the sealing ring 356 can simultaneously complete the sealing connection with the connecting strip 352 and the outer strip 351.

[0053] The upper surface of the connecting strip 352 is located below the lower surface of the outer strip 351, and the upper surface of the connecting strip 352 and the upper surface of the outer strip 351 are parallel to each other, so that the top of the connecting strip 352 is lower than the top of the outer strip 351, and the outer strip 351 is like a wall set outside the connecting strip 352, and the connecting strip 352 is like a concave ditch, which facilitates the discharge of materials from the discharge hole 353 on the connecting strip 352 and reduces the contact between the materials and the outer strip 351.

[0054] The angle between the connecting strip 352 and the vertical direction is smaller than the angle between the tangent line of the outer edge of the inner plate 354 and the vertical direction.

[0055] The angle between the connecting strip 352 and the vertical direction is smaller than the angle between the tangent line of the outer edge of the inner plate 354 and the vertical direction. The connecting strip 352 is more inclined, which can not only increase the component force when the material slides down along the surface of the connecting strip 352, but also increase the accommodation space between the connecting strip 352, the outer strip 351, and the top of the tube body 31, thereby reducing the possibility of impurities contacting the outer strip 351.

[0056] The pressing surface 359 is matched with the upper surface of the connecting strip 352 . When the outer strip 351 is engaged with the pressing groove 358 , the pressing surface 359 abuts against the connecting strip 352 . The pressing surface 359 is used to seal the discharge hole 353 , and the pressing groove 358 is used to seal the outer strip 351 .

[0057] The outer strip 351 and the pressing groove 358 form a sealing surface, and the pressing surface 359 and the connecting strip 352 form a sealing surface. When impurities (especially high-viscosity solutions) adhere to the surface of the connecting strip 352 and the surface of the connecting strip 352 is uneven, the contact between the connecting strip 352 and the pressing surface 359 is not tight enough, and the sealing effect is poor. There is a height difference between the top of the connecting strip 352 and the top of the outer strip 351, and impurities are not easy to adhere to the upper part of the connecting outer strip 351, thereby maintaining the sealing performance of the outer strip 351 and the pressing groove 358, providing additional protection when the sealing performance of the connecting strip 352 and the pressing surface 359 decreases, and improving the overall sealing performance.

[0058] The second opening and closing member 36 includes: a sealing ring 361, which is connected to the inner wall of the lower part of the first cavity 37. The cross-sectional view of one end of the sealing ring 361 after unfolding is an inverted needle shape. The side of the sealing ring 361 away from the axis of the tube body 31 is a side surface 365, and the side surface 365 is connected to the inner wall of the first cavity 37. The side of the sealing ring 361 close to the axis of the tube body 31 is composed of an inclined surface 363 and an arc surface 364. The inclined surface 363 is located above the arc surface 364. The inner wall of the sealing ring 361 is connected to a shift plate 362.

[0059] The inclined surface 363 and the side surface 365 gradually shrink along the axial direction of the tube body 31, and the arc surface 364 and the side surface 365 gradually shrink along the axial direction of the tube body 31. The distance from the top of the inclined surface 363 to the side surface 365 is greater than the distance from the bottom of the inclined surface 363 to the side surface 365, the distance from the bottom of the inclined surface 363 to the side surface 365 is equal to the distance from the top of the arc surface 364 to the side surface 365, and the distance from the top of the arc surface 364 to the side surface 365 is greater than the distance from the bottom of the arc surface 364 to the side surface 365.

[0060] The diameter of the moving plate 362 is larger than the diameter of the bottom of the sealing ring 361, and the diameter of the moving plate 362 is smaller than the diameter of the top of the sealing ring 361. The structure of the sealing ring 361 that is narrow at the top and wide at the bottom facilitates the moving plate 362 to enter the interior of the sealing ring 361, and also ensures that the moving plate 362 and the sealing ring 361 are tightly attached and sealed.

[0061] When in use, the top of the tube body 31 is connected to the inner wall of the bottom hole 5, the top of the tube body 31 and the bottom of the bottom hole 5 are located in the same plane, the inner plate 354 is protruding and arranged in the gap 4 between the ball 12 and the valve body 11, the inner plate 354 is connected with the connecting plate and the outer strip 351 to form a whole plate, the whole plate is arranged between the sealing ring 356 and the first spring 32, the first spring 32 presses the connecting plate, so that the whole plate where the connecting plate is located is tightly pressed together with the sealing ring 356, at this time, the pressing groove 358 is in contact with the outer strip 351 and seals the outer strip 351, and the pressing surface 359 is in contact with the upper surface of the connecting strip 352 and seals the discharge hole 353 on the connecting strip 352. At this time, the whole plate where the connecting strip 352 is located remains stationary under the elastic force of the spring and the support of the sealing ring 361, and the pressure sensor 355 will not detect the pressure event. The second spring 34 pulls the moving plate 362, and the moving plate 362 moves up along the axial direction of the sealing ring 361. The diameter of the bottom of the sealing ring 361 is larger than the diameter of the moving plate 362, and the diameter of the top of the sealing ring 361 is smaller than the diameter of the moving plate 362. The diameter of the sealing ring 361 gradually shrinks along the vertical direction as a whole. The inner side of the bottom of the sealing ring 361 is an arc surface 364, which is convenient for the inner wall of the sealing ring 361 and the moving plate 362 to slide relative to each other. The gradually shrinking diameter of the sealing ring 361 also facilitates guiding the moving plate 362 to fit with the sealing ring 361 until the sealing ring 361 and the moving plate 362 are pressed tightly together. The elastic coefficient of the second spring 34 is large, and the liquid above the moving plate 362 must reach a certain amount (It can be set according to actual conditions), the pressure and gravity on the top of the shift plate 362 can be greater than the sum of the elastic force and friction force of the second spring 34, and the shift plate 362 can move down from the first cavity 37 to the second cavity 38. The diameter of the second cavity 38 is greater than the diameter of the shift plate 362. A gap 4 is left between the inner wall of the second cavity 38 and the shift plate 362. The shift plate 362 no longer seals the first cavity 37. The material in the first cavity 37 falls into the second cavity 38 and is discharged from the bottom of the tube body 31. In order to ensure the airtightness of the gap 4, a valve can be set at the bottom of the tube body 31. When the entire plate where the connecting plate is located is sealed with the sealing ring 356, the gap 4 is not connected to the first cavity 37, and the valve can be opened to discharge the material.

[0062] The material in the gap 4 between the ball 12 and the valve body 11 cannot be carried away by the mainstream fluid, and the material accumulates, and the pressure on the inner plate 354 increases. Finally, the first spring 32 continues to compress downward, the connecting plate is separated from the pressure surface 359, and the connecting plate moves downward with the connecting block 357 and squeezes the pressure sensor 355. At this time, the pressure sensor 355 detects a pressure event, and the material in the gap 4 moves to the connecting plate and enters the first cavity 37 from the discharge hole 353. As the material in the gap 4 decreases, the downward pressure on the first spring 32 decreases, and the first spring 32 moves up to the initial position with the entire plate where the connecting plate is located, and the entire plate where the connecting plate is located is sealed with the sealing ring 356 again.

[0063] The opening and closing of the first opening and closing member 35 is controlled by the upward elastic force of the first spring 32 and the vertically downward combined force (the sum of its own gravity and the pressure of the material) of the entire plate where the inner plate 354 is located (the inner plate 354, the connecting plate, and the outer strip 351 form a whole plate). When the upward elastic force of the first spring 32 is less than the vertically downward combined force of the entire plate where the inner plate 354 is located, the first opening and closing member 35 opens, which can not only discharge excess material at the bottom of the valve body 11 into the first cavity 37 to keep the gap 4 between the valve body 11 and the ball 12 clean, but also record the time and frequency of opening of the first opening and closing member 35 through the pressure sensor 355, to assist in inferring the cause of material accumulation at the bottom of the valve body 11.

[0064] The first cavity 37 is separated from the second cavity 38 by the second opening and closing member 36, so that there are sealing components between the gap 4, the first cavity 37, and the second cavity 38, so as to prevent the gap 4 from being directly connected to the second cavity 38 or even the outside of the tube body 31, but to discharge the substances in the gap 4 into the first cavity 37 and the second cavity 38 in stages. The multi-layer sealing forms multiple sealing barriers, which can more effectively prevent the leakage of substances. When there is too much substance in the gap 4, the substance can be discharged into the first cavity 37, without worrying about the first cavity 37 being directly connected to the outside.

[0065] Example 2: Figure 1 - Figure 8 As shown, an embodiment of the present invention provides a corrosion-resistant ball valve made of duplex stainless steel, including: a rotation sensor 21 is connected to the upper surface of the handle 14, the rotation sensor 21 is used to monitor the rotation of the handle 14 in real time, the rotation sensor 21 is electrically connected to a timer 23 through a wire 22, the timer 23 cooperates with the rotation sensor 21 to obtain the start and end time of the rotation of the handle 14 and the interval time between two adjacent rotations, and the pressure sensor 355 is used to receive the extrusion of the connecting block 357 and obtain the start time, end time and duration of the extrusion.

[0066] The output pin of the rotation sensor 21 is connected to the trigger pin of the timer 23. When the rotation sensor 21 detects the start of rotation, the level of its output pin changes (such as from low level to high level). This change triggers the timer 23 to start timing and marks this moment as the time t1 when the rotation starts. When the rotation stops, the level of the sensor output pin changes again (such as from high level to low level). After the timer 23 detects this change, it marks this moment as the time when the rotation ends and stops timing t2. At this time, the time recorded by the timer 23 is the interval between opening the switch and closing the switch. When the rotation sensor 21 detects the start of the next rotation, it counts t3 again, so the interval between two adjacent rotations is t3-t2.

[0067] The pressure sensor 355 is synchronized with an external clock or timing device to record time. The pressure sensor 355 can communicate with other devices in the system (such as data acquisition cards, controllers, etc.), and these external devices have accurate timing functions. When the pressure sensor 355 detects a pressure event, it sends a signal to the external timing device, and the external timing device records the current time after receiving the signal. This method can utilize the high-precision timing capability of the external device to achieve accurate recording of the time of the pressure event. Thus, the start time, end time and duration of the pressure sensor 355 extrusion are obtained.

[0068] Based on the time and pressure value component plan, the horizontal axis of the plan is the time axis and the vertical axis is the pressure value axis.

[0069] The controller obtains the start and end time of the handle 14 rotation, the interval time between two adjacent rotations, the start and end time of the extrusion, the duration of the extrusion, and the pressure value in real time and transmits them to the plane map.

[0070] The plane map is divided into multiple blocks according to the time when the handle 14 starts and ends rotating and the interval between two adjacent rotations. Each block has a different color. The plane map interval within 30 seconds of the start and end of the rotation is one color, and the plane map interval within the interval between two adjacent rotations (excluding the time within 30 seconds of the start and end of the rotation) is another color. The pressure value is marked on the plane map to form a pressure line. During the time period when the pressure sensor 355 does not detect a pressure event, the pressure line is not displayed on the plane map.

[0071] Observe the plane diagram within 30 seconds between the start and end of the rotation. If a pressure line appears, it means that there is material accumulation at the bottom of the valve body 11. First, it can be assumed that the sealing performance of the ball valve has deteriorated; if there is a high-viscosity solution in the tube body 31, it can be preliminarily assumed that the high-viscosity solution cannot be taken away with the main flow of the fluid in time after each rotation of the ball 12, and will gradually accumulate at the bottom of the valve body 11; if the solution contains solid impurities, particles or fibers, it can be preliminarily assumed that the impurities accumulate at the bottom of the valve body 11 under the action of gravity; Then observe the plane diagram interval between two adjacent rotations. If the pressure line continues to appear, it means that the ball valve is leaking. The leakage can be judged more specifically based on the duration of the pressure line and the pressure value, and the leakage level can be handled; if the pressure line does not appear, when the tube body 31 contains a high-viscosity solution, it is likely that the high-viscosity solution cannot be discharged from the valve body 11 in time and accumulates; if the solution in the tank contains solid impurities, particles or fibers, it is likely that the impurities are difficult to discharge and accumulate. The subsequent maintenance process can be determined according to the specific situation, and be prepared.

[0072] When no pressure line appears on the plan view, the gap 4 is not connected to the first cavity 37 , and the valve can be opened to facilitate the material in the first cavity 37 to flow out from the second cavity 38 and the bottom of the tube body 31 in sequence.

[0073] A process for manufacturing a corrosion-resistant forging made of duplex stainless steel, comprising: Hot ingots are put into the furnace: the forging heating furnace is preheated to a temperature within 100°C of the ingot temperature. After demoulding, the hot ingot is immediately transferred to the forging heating furnace for heating, and the hot ingot is slowly heated to 1200°C.

[0074] Forging: Use a 60MN press to perform small deformation and compaction on the surface of the ingot, remove the ingot riser, and then perform upsetting and forming on the ingot, with a total of 4-5 fires.

[0075] Hot material transfer heat treatment: After manufacturing, the hot material is transferred to the heat treatment furnace for solid solution. The heat treatment furnace needs to be heated to 1100℃ in advance to keep warm.

[0076] The existing technical mode is to heat the cold material, forge it, and then heat treat it for solid solution after the forging is cooled. It can only produce duplex stainless steel below 5 tons. Through the production mode of hot ingot into the furnace - forging - hot material heat treatment, on the one hand, it shortens the heating and heat treatment temperature rise time, saves energy, and shortens the entire manufacturing process, improving production efficiency. On the other hand, this mode can avoid cracking on the surface of the steel ingot, ensure the quality of forging, and reduce the workload of subsequent grinding and machining. It can achieve the forging of more than 10 tons of duplex stainless steel.

[0077] Due to the composition characteristics of super duplex stainless steel, the internal structure is ferrite and austenite, and each phase occupies a large volume ratio. The σ phase is the most harmful phase, which is hard and brittle, greatly reducing the toughness and plasticity of the material. Among them, Ni and Mo elements, especially Mo element, are more likely to promote the formation of σ phase, and increase the precipitation range of σ phase to above 900℃, which means that in the medium temperature range, the precipitation time of σ phase is longer and the proportion is larger. Due to the large volume and slow cooling of large ingots, the proportion of σ phase precipitation is larger during the cooling after steelmaking or the slow heating of the ingot. The grain boundary inside the ingot is more fragile. Since the material has the characteristics of thermal expansion and contraction, internal stress will appear inside the material during the heating process. Under the joint action of internal stress and σ phase, the ingot is induced to heat and crack. In addition, there is element segregation in the smelting of large ingots. The part where Mo element gathers often becomes the source of cracks. The existing technical mode is to heat the cold material, forge and form, and then transfer the forging to heat treatment and solid solution after cooling. It can only produce duplex stainless steel below 5 tons, and the processing method is converted into: hot ingot to forging heating - forging forming - hot state to heat treatment furnace heating. After the ingot is demolded, it is immediately transferred to the heating furnace for heating in a hot state to reduce the precipitation of σ phase during the cooling process of the hot ingot and the slow heating process of the cold ingot. Reduce the internal stress of the ingot and reduce the formation of brittle phases. In the forging process, a small deformation is first used to compact the surface cast structure, and then a large deformation is used to heal the internal looseness for forging. After forging, the hot state is transferred to heat treatment and solid solution to further avoid the precipitation of σ phase during the cooling process. The entire process is operated at the upper limit of σ phase precipitation, and finally the forging of ultra-large duplex stainless steel is successfully achieved.

[0078] Hot ingots are put into the furnace: Check the equipment condition of the heating furnace, including the furnace door, heating elements, temperature control system, etc., to ensure their normal operation. According to the material and specifications of the ingot, determine the heating process parameters (such as heating temperature, heating rate, etc.), and preheat the forging heating furnace in advance to a temperature within 100°C of the ingot temperature. Lift the ingot to the vicinity of the heating furnace and prepare the lifting tools and auxiliary equipment. Use a crane or other lifting equipment to load the ingot into the heating furnace smoothly. After demolding, the hot ingot is immediately transferred to the forging heating furnace for heating, and the hot ingot is slowly heated to 1200°C. Pay attention to the placement and spacing of the ingots to ensure that the heat in the furnace is evenly distributed to avoid collisions between ingots or contact with the heating elements. According to the predetermined heating process parameters, start the heating furnace for heating. During the heating process, closely monitor the temperature changes in the furnace and ensure that the temperature is controlled within the specified range through the temperature control system. For large ingots, a longer heating time may be required to ensure that their internal structure is fully homogenized.

[0079] Forging: When the ingot is heated to the specified temperature, it is taken out of the heating furnace and quickly hoisted to the forging equipment. Check the forging equipment, such as large hydraulic presses, air hammers, etc., to ensure that the equipment is in good working condition, adjust the forging die, and ensure that the installation accuracy and clearance of the die meet the requirements. Prepare the tools required for forging, such as clamps, choppers, etc., and preheat them to prevent defects in the forgings due to excessive temperature differences during the forging process. Use a 60MN press to compact the surface of the ingot with small deformation, remove the ingot riser, and then perform upsetting and forming on the ingot, with a total of 4-5 fires. By controlling parameters such as forging ratio, reduction and forging speed, the forgings can obtain good internal structure and mechanical properties. For example, the upsetting ratio should be controlled during upsetting to avoid defects such as folding during upsetting; the lengthening should be fed evenly to ensure that the length and diameter of the forging meet the requirements. During the forging process, the forgings need to be constantly turned and moved to ensure that all parts can be fully forged. At the same time, it is necessary to observe the surface quality and shape changes of the forgings, and promptly discover and deal with possible defects such as cracks, flash, etc. Depending on the size and precision requirements of the forgings, multiple forging processes and intermediate heating may be required to gradually achieve the final shape and size.

[0080] Hot material to heat treatment: The heat treatment furnace needs to be heated to 1100℃ in advance to keep the material warm. After forging is completed, the hot forgings are quickly transferred to the heat treatment equipment. If a rapid cooling process such as quenching is used, the quenching medium, such as oil and water, should be prepared in advance, and the temperature, flow rate and other parameters of the quenching medium should be ensured to meet the process requirements. Check the heat treatment equipment, such as the heat treatment furnace, cooling device, etc., to ensure that they can operate normally. According to the material and performance requirements of the forgings, formulate the heat treatment process, including heating temperature, holding time, cooling method, etc. The forgings are placed in the heat treatment furnace and heated according to the predetermined heat treatment process. During the heating process, the heating speed and temperature uniformity must be strictly controlled to prevent excessive thermal stress in the forgings due to excessive heating or uneven temperature. After reaching the specified heating temperature, keep the heat for a period of time to make the internal structure of the forgings fully uniform. The length of the heat preservation time depends on the size, material and specific heat treatment process requirements of the forgings. After the heat preservation is completed, cool according to the requirements of the heat treatment process. There are many cooling methods, such as air cooling, water cooling, oil cooling, etc. Different cooling methods will make forgings obtain different structures and properties. For example, water cooling has a faster speed, which can obtain higher hardness and strength, but it is easy to produce greater internal stress; oil cooling has a relatively slow cooling speed, smaller internal stress, but the improvement of hardness and strength is relatively limited. During the cooling process, the cooling speed and cooling time should be controlled to avoid defects such as cracks and deformation in forgings due to improper cooling. Forgings after heat treatment need to undergo comprehensive quality inspection, including appearance inspection, dimensional accuracy measurement, hardness testing, metallographic structure analysis, and mechanical property testing. Through these inspection items, it is judged whether the forgings meet the design requirements and relevant standards. If quality problems are found in the forgings, it is necessary to analyze the causes and take corresponding measures to improve them, such as re-heat treatment or repair of defective parts.

[0081] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A corrosion-resistant forging made of duplex stainless steel, characterized in that: include: A valve body (11), wherein a bottom hole (5) is formed through the bottom of the valve body (11), wherein a liquid control device (3) is arranged in the bottom hole (5), and wherein the liquid control device (3) comprises: a tube body (31), wherein a side surface (365) of the tube body (31) is connected to an inner wall of the bottom hole (5), wherein a first opening and closing member (35), a second opening and closing member (36), and a horizontal plate (33) are arranged in the tube body (31), wherein two sides of the horizontal plate (33) are respectively connected to a side close to the first opening and closing member (35) and the second opening and closing member (36) via a first spring (32) and a second spring (34), wherein the first opening and closing member (35) is used to control the opening and closing of the cavity and discharge substances accumulated in the cavity, and wherein the second opening and closing member (36) is used to control the opening and closing of the tube body (31) and discharge substances accumulated in the tube body (31).

2. A corrosion-resistant ball valve made of duplex stainless steel, characterized in that: include: The corrosion-resistant forging made of duplex stainless steel and the liquid control device (3) as claimed in claim 1, wherein the liquid control device (3) is connected to the inner wall of the bottom hole (5), a ball (12) is arranged in the valve body (11), a gap (4) is arranged between the ball (12) and the valve body (11), the gap (4) is connected to one end of the bottom hole (5), valve seats (15) are symmetrically arranged on the left and right sides of the valve body (11), the top of the ball (12) is connected to a handle (14) through a valve stem (13), the upper surface of the handle (14) is connected to a rotation sensor (21), the rotation sensor (21) is used to monitor the rotation of the handle (14) in real time, the rotation sensor (21) is electrically connected to a timer (23) through a wire (22), and the timer (23) cooperates with the rotation sensor (21) to obtain the time when the handle (14) starts and ends rotating and the interval time between two adjacent rotations.

3. The corrosion-resistant ball valve made of duplex stainless steel according to claim 2, characterized in that: The liquid control device (3) further comprises: a first cavity (37), the first cavity (37) being opened in the middle and upper part of the tube body (31), a second cavity (38) being opened in the lower part of the tube body (31) and being in communication with the first cavity (37), a first opening and closing member (35) being arranged at the top of the first cavity (37), a second opening and closing member (36) being arranged at the bottom of the first cavity (37), an inner wall of the lower part of the first cavity (37) being connected to one side of the horizontal plate (33), a top of the horizontal plate (33) being connected to the first opening and closing member (35) via a first spring (32), and a bottom of the horizontal plate (33) being connected to the top of the second opening and closing member (36) via a second spring (34).

4. The corrosion-resistant ball valve made of duplex stainless steel according to claim 3, characterized in that: The first opening and closing member (35) comprises: a sealing ring (356), a side surface (365) of the sealing ring (356) being connected to the inner wall of the top of the tube body (31), a pressing groove (358) being provided in the middle of the lower surface of the sealing ring (356), a lower surface of the sealing ring (356) close to the axis of the tube body (31) being a pressing surface (359), an outer strip (351) being clamped in the pressing groove (358), the outer strip (351) being connected to the inner plate (354) via a connecting strip (352), the top of the connecting strip (352) being provided with a pressing groove (358). A plurality of discharge holes (353) are provided in a circular array through the tube body (31). The bottom of the sealing ring (356) is connected to a connection block (357). The bottom of the connection block (357) is parallel to the horizontal plane. A pressure sensor (355) is provided directly below the connection block (357). The side surface (365) of the pressure sensor (355) is connected to the inner wall of the upper part of the tube body (31). The pressure sensor (355) is used to receive the extrusion of the connection block (357) and obtain the start time, end time and duration of the extrusion.

5. The corrosion-resistant ball valve made of duplex stainless steel according to claim 4, characterized in that: The inner plate (354) is a spherical plate, the connecting strip (352) and the outer strip (351) are both annular strips, the lower surface of the connecting strip (352) and the lower surface of the outer strip (351) are in the same plane, the upper surface of the connecting strip (352) is located below the lower surface of the outer strip (351), and the upper surface of the connecting strip (352) and the upper surface of the outer strip (351) are parallel to each other.

6. The corrosion-resistant ball valve made of duplex stainless steel according to claim 4, characterized in that: The angle between the connecting strip (352) and the vertical direction is smaller than the angle between the tangent line of the outer edge of the inner plate (354) and the vertical direction.

7. The corrosion-resistant ball valve made of duplex stainless steel according to claim 4, characterized in that: The pressing surface (359) is matched with the upper surface of the connecting strip (352); when the outer strip (351) is engaged with the pressing groove (358), the pressing surface (359) abuts against the connecting strip (352); the pressing surface (359) is used to seal the discharge hole (353); and the pressing groove (358) is used to seal the outer strip (351).

8. The corrosion-resistant ball valve made of duplex stainless steel according to claim 3, characterized in that: The second opening and closing member (36) comprises: a sealing ring (361), the sealing ring (361) being connected to the inner wall of the lower part of the first cavity (37), the cross-sectional view of one end of the sealing ring (361) after being unfolded being an inverted needle shape, the side of the sealing ring (361) away from the axis of the tube body (31) being a side surface (365), the side surface (365) being connected to the inner wall of the first cavity (37), the side of the sealing ring (361) close to the axis of the tube body (31) being composed of an inclined surface (363) and an arc surface (364), the inclined surface (363) being located above the arc surface (364), and the inner wall of the sealing ring (361) being connected to a shift plate (362).

9. The corrosion-resistant ball valve made of duplex stainless steel according to claim 8, characterized in that: The inclined surface (363) and the side surface (365) gradually shrink along the axial direction of the tube body (31); the arc surface (364) and the side surface (365) gradually shrink along the axial direction of the tube body (31); the distance from the top of the inclined surface (363) to the side surface (365) is greater than the distance from the bottom of the inclined surface (363) to the side surface (365); the distance from the bottom of the inclined surface (363) to the side surface (365) is equal to the distance from the top of the arc surface (364) to the side surface (365); the distance from the top of the arc surface (364) to the side surface (365) is greater than the distance from the bottom of the arc surface (364) to the side surface (365); the diameter of the moving plate (362) is greater than the diameter of the bottom of the sealing ring (361); and the diameter of the moving plate (362) is smaller than the diameter of the top of the sealing ring (361).

10. A process for manufacturing the corrosion-resistant forging made of duplex stainless steel according to claim 1, characterized in that: include: Hot ingots are put into the furnace: the forging heating furnace is preheated to a temperature within 100°C of the ingot temperature. After demoulding, the hot ingot is immediately transferred to the forging heating furnace for heating, and the hot ingot is slowly heated to 1200°C. Forging: Use a 60MN press to compact the surface of the ingot with a small deformation, remove the ingot riser, and then perform upsetting and forming on the ingot, with a total of 4-5 fires; Hot material transfer heat treatment: After manufacturing, the hot material is transferred to the heat treatment furnace for solid solution. The heat treatment furnace needs to be heated to 1100℃ in advance to keep warm.

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