An austempered ductile iron heat treatment equipment and its usage method

Abstract

The present invention discloses an austempered ductile iron heat treatment device and its usage method, which relates to the field of heat treatment and is used for isothermal heat treatment of tubular ductile iron materials. It includes: a heating cylinder, a centering clamping device, and an isothermal heating cover; the centering clamping device is arranged at the bottom side inside the heating cylinder and is used for centering and fixing the bottom end of the tubular ductile iron material; the isothermal heating cover can be arranged inside the heating cylinder, and a plurality of them are evenly distributed along the circumferential direction on the inner side and the outer side of the tubular ductile iron material respectively. The advantages of the present invention compared with the prior art are as follows: The inner wall and the outer wall at any position of the tubular ductile iron material can be covered by the same isothermal heating cover. As the isothermal heating cover rotates along the circumferential direction on the outer side of the tubular ductile iron material, uniform heat treatment of the same degree is achieved on the inner wall and the outer wall of the ductile iron material, improving the heat treatment effect.

Description

Technical Field

[0001] The present invention relates to the field of heat treatment, and specifically refers to an austempered ductile iron heat treatment device and its usage method. Background Art

[0002] Ductile iron pipe fittings are pipe fittings that use magnesium or rare earth magnesium combined nodulizer added to the molten iron before pouring to spheroidize graphite, reduce stress concentration, and make the pipes have advantages such as high strength, high elongation, impact resistance, corrosion resistance, and good sealing performance. In order to further reduce the internal stress generated during the casting and cooling of ductile iron pipe fittings, heat treatment of ductile iron pipe fittings is required.

[0003] Currently, when heating ductile iron in the shape of a pipe for heat treatment, the ductile iron material is generally placed in a heating container and heated by heaters on the inner wall of the heating container. For example, the publicly disclosed patent application CN116590511B. However, this solution mainly heats the outer surface of the ductile iron at the beginning of heating, and it is only after heating for a certain period of time that the inner side of the pipe-shaped material starts to be heated, and it is impossible to effectively heat the inner and outer walls of the ductile iron evenly, resulting in uneven heating. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the technical problem in the prior art that it is impossible to effectively heat the inner and outer walls of ductile iron evenly, resulting in uneven heating, and to provide an austempered ductile iron heat treatment device and its usage method that can effectively heat the inner and outer walls of ductile iron materials to the same extent.

[0005] To solve the above technical problem, the technical solution provided by the present invention is: an austempered ductile iron heat treatment device for isothermal heat treatment of pipe-shaped ductile iron materials, including: a heating cylinder, a centering clamping device, and an isothermal heating cover;

[0006] The centering clamping device is arranged at the bottom side inside the heating cylinder and is used for centering and fixing the bottom end of the pipe-shaped ductile iron material;

[0007] The isothermal heating cover can be arranged inside the heating cylinder, and a plurality of them are evenly distributed along the circumferential direction on the inner and outer sides of the pipe-shaped ductile iron material respectively;

[0008] The isothermal heating cover can rotate simultaneously along the circumferential direction on the outer and inner sides of the pipe-shaped ductile iron material, so that the inner and outer walls of the pipe-shaped ductile iron material are heated to the same extent simultaneously.

[0009] Preferably, on one side of one end of the heating cylinder, a plurality of frames are arranged along the circumferential direction. On both sides inside the frames, first sliding plates are respectively connected. On the opposite sides of the two first sliding plates, they are respectively connected to the isothermal heating cover. By sliding the first sliding plates in the frames, the distance between the isothermal heating cover and the ductile cast iron is adjusted.

[0010] Preferably, electromagnets are respectively connected to both ends of the frame through support plates. Inside both ends of the frame, screw rods are connected. On the side of the first sliding plate facing the electromagnet, an elastic telescopic rod is connected. Inside the elastic telescopic rod, a tube body is connected. Inside the tube body, a turntable is connected through a bearing. The turntable is sleeved outside the screw rod, and the inside of the turntable is matched with the screw rod. On one side of the first sliding plate, a second sliding plate is connected through two symmetrically arranged elastic telescopic rods. The second sliding plate is made of a magnetic material that can be attracted by the electromagnet. A fixing component for fixing the turntable is arranged on one of the elastic telescopic rods.

[0011] Preferably, the fixing component includes a plurality of fixing rods arranged at the lower edge position of the turntable and a pin rod slidably arranged on one of the elastic telescopic rods. A fixing ring is arranged on the lower side of the fixing rod. One of the elastic telescopic rods includes a cylinder body one, a sliding push rod, and a piston one. One end of the cylinder body one is connected to the first sliding plate. The sliding push rod slidably inserts into one end of the cylinder body one and is connected to the piston one. An air tank is fixedly arranged inside the cylinder body one. A pore is arranged at one end of the air tank close to the sliding push rod. Inside the cylinder body one, a cylinder body two is embedded at the end far from the sliding push rod. One end of the pin rod slidably inserts into the cylinder body two and is connected to a piston two. A solenoid valve communicating with the cylinder body one is arranged at the end of the cylinder body two far from the pin rod. The other end of the pin rod can be inserted between adjacent fixing rods.

[0012] Preferably, a pressing rod penetrates through one end of the isothermal heating cover close to the frame. On the end of the pressing rod outside the isothermal heating cover, a first contact block is connected. On the other end of the pressing rod, a second contact block is connected. A first contact piece is arranged on one side of the first contact block. On the outside of the isothermal heating cover, a second contact piece that can abut against the first contact piece is arranged. The first contact block is made of a magnetic material that can be attracted by the electromagnet.

[0013] Preferably, the top wall of the isothermal heating cover is a rotatable rotating plate. One end of the rotating plate is hinged to the isothermal heating cover through a spring hinge. The other side of the rotating plate can abut against the isothermal heating cover. A fan-shaped heat-conducting metal plate that can extend to the inside and outside of the isothermal heating cover is embedded in the rotating plate. A heater is arranged on the side of the rotating plate inside the isothermal heating cover.

[0014] Preferably, the centering clamping device includes a plurality of first fixing plates. One end of each of the plurality of first fixing plates is connected to the inner wall of the heating cylinder. The other ends of the first fixing plates are fixed together and connected to the electric push rod. The connection line of the far ends of the plurality of first fixing plates is a regular polygon. The first fixing plate is provided with a sliding hole. Both ends of the sliding hole are provided with sliding columns. A first slider is slidably sleeved on the outer side of the sliding column. One end of the first slider extends outside the sliding hole and abuts against the ductile iron material. The other end of the first slider is hinged with a traction rod. The other end of the traction rod is hinged to the edge of the output end of the electric push rod.

[0015] Preferably, the lower end of the heating cylinder is connected with a bottom plate through a support foot. The edge positions of the upper end of the bottom plate are respectively connected with hydraulic push rods through columns. The output end of the hydraulic push rod is connected with a lifting frame. Both inner walls of the lifting frame are provided with first chutes. The inner wall of the first chute is connected with a second fixing plate. The lower side of the second fixing plate is connected with a cover plate for closing the upper end of the heating cylinder. One side of the second fixing plate is connected with a rack that can penetrate one end of the lifting frame. The lifting frame is provided with a sliding hole that cooperates with the rack. A gear is rotatably arranged in the sliding hole. The lower side of the lifting frame is connected with a rotating seat that rotatably connects both sides of the gear. One side of one of the rotating seats is connected with a first driving motor. The output end of the first driving motor penetrates the rotating seat and is connected with the gear.

[0016] Preferably, a second driving motor is connected to the upper side of the cover plate. The output end of the second driving motor is connected with a first bevel gear. A rotating shaft is rotatably penetrated through the cover plate through a bearing. One end of the rotating shaft is connected with a second bevel gear that meshes with the first bevel gear. The other end of the rotating shaft is connected with a ring through a plurality of first support rods. The outer side of the ring is respectively connected with a frame body through a plurality of second support rods. A fan blade is arranged on the second support rod.

[0017] Preferably, the present application provides a method for using the austempered ductile iron heat treatment equipment as described in the above embodiment, including:

[0018] The ductile iron material to be heat-treated is placed on the centering clamping device;

[0019] The ductile iron material is centered and moved by the centering clamping device;

[0020] The isothermal heating covers are evenly distributed on the inner and outer sides of the ductile iron material opposite to each other and rotate around the ductile iron material to heat the inner and outer walls of the ductile iron material to the same degree.

[0021] The advantages of the present invention compared with the prior art are as follows: when placing the tubular ductile iron material inside the heating cylinder, the inner and outer walls of any position of the tubular ductile iron material can be covered by the same isothermal heating cover. As the isothermal heating cover rotates circumferentially outside the tubular ductile iron material, uniform heat treatment of the same degree is achieved on the inner and outer walls of the ductile iron material, improving the heat treatment effect;

[0022] When placing the tubular ductile iron material on the centering clamping device, it can automatically adjust the position of the isothermal heating covers on the inner and outer sides of the tubular ductile iron to be fixed after approaching the tubular ductile iron, facilitating the convenient adjustment of the positions of the isothermal heating covers for tubular ductile irons of different sizes and different thicknesses;

[0023] For tubular ductile iron materials of different sizes or thicknesses, through the action of the extrusion rod, when the isothermal heating cover adjusts the distance relative to the tubular ductile iron material during heating, when the second contact block abuts against and extrudes the ductile iron material, the first contact piece and the second contact piece are separated, automatically fixing the distance between the isothermal heating cover and the tubular ductile iron material. At this time, it represents that the isothermal heating cover reaches the preset distance from the tubular ductile iron material. The purpose is to avoid the situation that when the distance between the isothermal heating cover and the tubular ductile iron material is too close, the isothermal heating cover scratches the tubular ductile iron material, or when it is too far, the heating effect of the isothermal heating cover on the tubular ductile iron material becomes poor, and to adjust the distances between multiple isothermal heating covers and the tubular ductile iron material to be nearly equal;

[0024] By turning on the electromagnet, on the one hand, during the process of fixing the position of the isothermal heating cover, the first contact block is always attached to the isothermal heating cover by the repulsion of like poles, facilitating the fixation of the position of the isothermal heating cover when the second contact block abuts against the tubular ductile iron. On the other hand, it can make the second sliding plate slide towards the first sliding plate direction by the repulsion of like poles, and cooperate with the elastic telescopic rod and the first sliding plate to provide power when the isothermal heating cover moves towards the tubular ductile iron material. When the electromagnet is turned on with opposite polarity, it attracts the second contact block, facilitating the separation of the first contact block from the ductile iron material after fixing the isothermal heating cover to avoid scratching the ductile iron material. On the other hand, by sucking the second sliding plate, a negative pressure is generated in the air tank, and only by opening the solenoid valve can the fixation of the position of the isothermal heating cover be unlocked;

[0025] Through the action of the heat-conducting metal plate, when spheroidal graphite cast iron in a tubular shape is processed, a small part of the heat inside the isothermal heating cover can be transferred to the inside of the heating cylinder, avoiding a large temperature drop of the spheroidal graphite cast iron material in the tubular shape due to a large temperature difference between the inside and outside of the isothermal heating cover, which affects the heating effect of the spheroidal graphite cast iron material in the tubular shape. When cooling the spheroidal graphite cast iron material after heat treatment, the isothermal heating cover can be reversed inside the heating cylinder, and the inner and outer walls of the spheroidal graphite cast iron material can be evenly cooled by the arc-shaped heat-conducting metal plate;

[0026] When the isothermal heating cover rotates, the rotation of the fan blade is driven by the rotation of the second support rod, thereby increasing the air flow rate inside the spheroidal graphite cast iron material in the tubular shape, improving the temperature balance effect inside and outside the inertial spheroidal graphite cast iron material, and avoiding the accumulation of heat inside the spheroidal graphite cast iron material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0028] Figure 2 is a schematic three-dimensional structure diagram of another perspective of the present invention;

[0029] Figure 3 is a schematic three-dimensional structure diagram of the inside of the heating cylinder of the present invention;

[0030] Figure 4 is a schematic three-dimensional structure diagram of the first sliding plate of the present invention;

[0031] Figure 5 is a schematic three-dimensional structure diagram of the centering clamping device of the present invention;

[0032] Figure 6 is a schematic three-dimensional structure diagram of the frame of the present invention;

[0033] Figure 7 is a schematic diagram of the structure of one side of the frame of the present invention;

[0034] Figure 8 is the present invention Figure 7 Schematic cross-sectional structure diagram at the A-A position in;

[0035] Figure 9 is the present invention Figure 7 Schematic cross-sectional structure diagram at the B-B position in;

[0036] Figure 10 is a schematic three-dimensional structure diagram of the first sliding plate of the present invention;

[0037] Figure 11 is a schematic three-dimensional structure diagram of the screw rod of the present invention;

[0038] Figure 12 is a schematic three-dimensional structure diagram of the second sliding plate of the present invention.

[0039] Figure 13 is the enlarged structural schematic diagram of position A in the present invention Figure 8

[0040] Figure 14 is the enlarged structural schematic diagram of position B in the present invention Figure 13

[0041] Figure 15 is the enlarged structural schematic diagram of position C in the present invention Figure 13

[0042] Figure 16 is the enlarged structural schematic diagram of position D in the present invention Figure 1

[0043] As shown in the figure: 1. Ductile iron material; 2. Heating cylinder; 3. Centering clamping device; 4. Isothermal heating cover; 5. Frame; 6. First sliding plate; 7. Electromagnet; 8. Screw rod; 9. Elastic telescopic rod; 10. Pipe body; 11. Turntable; 12. Second sliding plate; 13. Fixing component; 14. Fixing rod; 15. Plug rod; 16. Fixing ring; 17. Cylinder I; 18. Sliding push rod; 19. Piston I; 20. Gas tank; 21. Air hole; 22. Cylinder II; 23. Piston II; 24. Solenoid valve; 25. Extrusion rod; 26. First contact block; 27. Second contact block; 28. First contact piece; 29. Second contact piece; 30. Slide block II; 31. Rotating plate; 32. Heat-conducting metal plate; 33. Heater; 34. First fixing plate; 35. Slide hole; 36. Slide column; 37. Slide block I; 38. Traction rod; 39. Bottom plate; 40. Lifting frame; 41. First chute; 42. Second fixing plate; 43. Cover plate; 44. Rack; 45. Gear; 46. Rotating seat; 47. First driving motor; 48. Second driving motor; 49. Rotating shaft; 50. First support rod; 51. Ring; 52. Second support rod; 53. Second chute; 54. Hydraulic push rod; 55. Support plate; 56. Fan blade; 57. Electric push rod.

[0044] For a further understanding of the drawings, which form a part of the specification and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. Detailed implementation manners

[0045] ​​​​In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. Additionally, the term "comprising" and any of its variations are intended to cover non-exclusive inclusion.

[0046] Please refer to the attached Figure 1-16 , an austempered ductile iron heat treatment device for performing austempering heat treatment on a tubular ductile iron material 1, comprising: a heating cylinder 2, a centering clamping device 3, and an isothermal heating cover 4;

[0047] The centering clamping device 3 is arranged at the bottom side inside the heating cylinder 2 and is used for centering and fixing the bottom end of the tubular ductile iron material 1;

[0048] The isothermal heating cover 4 can be arranged inside the heating cylinder 2, and a plurality of them are evenly distributed along the circumferential direction on the inner side and the outer side of the tubular ductile iron material 1 respectively;

[0049] The isothermal heating cover 4 can rotate along the circumferential direction simultaneously on the outer side and the inner side of the tubular ductile iron material 1, so that the inner and outer walls of the tubular ductile iron material 1 are heated to the same extent simultaneously.

[0050] In some preferred embodiments, a plurality of frames 5 arranged along the circumferential direction are provided on one side of one end of the heating cylinder 2. Both sides inside the frame 5 are respectively connected with a first sliding plate 6. The opposite sides of the two first sliding plates 6 are respectively connected with the isothermal heating cover 4. By sliding the first sliding plate 6 in the frame 5, the distance between the isothermal heating cover 4 and the tubular ductile iron is adjusted.

[0051] In some preferred embodiments, electromagnets 7 are respectively connected to both ends of the frame body 5 through support plates 55. Screw rods 8 are connected to the inner sides of both ends of the frame body 5. An elastic telescopic rod 9 is connected to the side of the first sliding plate 6 facing the electromagnet 7. A tube body 10 is connected to the inner side of the elastic telescopic rod 9. A turntable 11 is connected to the inner side of the tube body 10 through a bearing. The turntable 11 is sleeved on the outside of the screw rod 8, and the inner side of the turntable 11 is matched with the screw rod 8. A second sliding plate 12 is connected to one side of the first sliding plate 6 through two symmetrically arranged elastic telescopic rods 9. The second sliding plate 12 is made of a magnetic material that can be attracted by the electromagnet 7. A fixing component 13 for fixing the turntable 11 is provided on one of the elastic telescopic rods 9.

[0052] In some preferred embodiments, the fixing component 13 includes a plurality of fixing rods 14 arranged at the lower side edge position of the turntable 11 and a pin rod 15 slidably arranged on one of the elastic telescopic rods 9. A fixing ring 16 is provided at the lower side of the fixing rod 14. One of the elastic telescopic rods 9 includes a cylinder body one 17, a sliding push rod 18 and a piston one 19. One end of the cylinder body one 17 is connected to the first sliding plate 6. The sliding push rod 18 is slidably inserted into one end of the cylinder body one 17 and connected to the piston one 19. An air tank 20 is fixedly arranged in the cylinder body one 17. An air hole 21 is provided at one end of the air tank 20 close to the sliding push rod 18. A cylinder body two 22 is embedded at the end of the inner side of the cylinder body one 17 far from the sliding push rod 18. One end of the pin rod 15 is slidably inserted into the cylinder body two 22 and connected to a piston two 23. A solenoid valve 24 communicating with the cylinder body one 17 is provided at the end of the cylinder body two 22 far from the pin rod 15. The other end of the pin rod 15 can be inserted between adjacent fixing rods 14.

[0053] In some preferred embodiments, a pressing rod 25 penetrates through one end of the isothermal heating cover 4 close to the frame body 5. A first contact block 26 is connected to the end of the pressing rod 25 outside the isothermal heating cover 4. A second contact block 27 is connected to the other end of the pressing rod 25. A first contact piece 28 is provided on one side of the first contact block 26. A second contact piece 29 capable of abutting against the first contact piece 28 is provided on the outside of the isothermal heating cover 4. The first contact block 26 is made of a magnetic material that can be attracted by the electromagnet 7.

[0054] In some preferred embodiments, the top wall of the isothermal heating cover 4 is a rotatable rotating plate 31. One end of the rotating plate 31 is hinged to the isothermal heating cover 4 through a spring hinge. The other side of the rotating plate 31 can abut against the isothermal heating cover 4. A fan-shaped heat-conducting metal plate 32 capable of extending to the inner and outer sides of the isothermal heating cover 4 is embedded in the rotating plate 31. A heater 33 is provided on the side of the rotating plate 31 inside the isothermal heating cover 4.

[0055] In some preferred embodiments, the centering clamping device 3 includes a plurality of first fixing plates 34. One end of each of the plurality of first fixing plates 34 is connected to the inner wall of the heating cylinder 2, and the other ends of the first fixing plates 34 are fixed together and connected to the electric push rod 57. The connection line of the plurality of first fixing plates 34 at the far ends is a regular polygon. The first fixing plate 34 is provided with a sliding hole 35, and sliding columns 36 are provided at both ends of the sliding hole 35. A first slider 37 is slidably sleeved on the outer side of the sliding column 36. One end of the first slider 37 extends outside the sliding hole 35 and abuts against the ductile iron material 1. The other end of the first slider 37 is hinged with a traction rod 38, and the other end of the traction rod 38 is hinged to the edge of the output end of the electric push rod 57.

[0056] Specifically, when the ductile iron material 1 to be heat-treated is placed on the upper side of the first fixing plate 34 and visually centered in the heating cylinder 2 as much as possible, and all the first sliders 37 are outside the ductile iron material 1 at this time, by opening the hydraulic push rod 54, one end of the plurality of traction rods 38 is pushed away from one end of the ductile iron material 1, thereby driving the plurality of first sliders 37 to stably slide in the sliding hole 35 and on the outer side of the sliding column 36 at the same time. Then, the edge position of the ductile iron is simultaneously extruded by the first sliders 37 until all the first sliders 37 abut against the ductile iron material 1, realizing the centering of the ductile iron material 1 in the heating cylinder 2, which is convenient for uniform heating when the isothermal heating cover 4 rotates.

[0057] In some preferred embodiments, the lower end of the heating cylinder 2 is connected with a bottom plate 39 through support feet. Hydraulic push rods 54 are respectively connected to the edge positions of the upper end of the bottom plate 39 through columns. The output end of the hydraulic push rod 54 is connected with a lifting frame 40. Slide grooves 41 are provided on both inner walls of the lifting frame 40. A second fixing plate 42 is connected to the inner wall of the slide groove 41. A cover plate 43 for closing the upper end of the heating cylinder 2 is connected to the lower side of the second fixing plate 42. A rack 44 capable of penetrating one end of the lifting frame 40 is connected to one side of the second fixing plate 42. A sliding hole 35 matching with the rack 44 is provided on the lifting frame 40. A gear 45 is rotatably provided in the sliding hole 35. A rotating seat 46 rotatably connected to both sides of the gear 45 is connected to the lower side of the lifting frame 40. A driving motor 47 is connected to one side of one of the rotating seats 46, and the output end of the driving motor 47 penetrates the rotating seat 46 and is connected to the gear 45.

[0058] Specifically, by opening the hydraulic push rod 54, the lifting of the lifting frame 40 can be adjusted, and then, in cooperation with the second fixing plate 42 and the rotating shaft 49, the isothermal heating cover 4 can be lifted and lowered out of the heating cylinder 2 on the heating cylinder 2. By opening the first driving motor 47 to drive the rotation of the gear 45, the rack 44 can be driven to slide in the sliding hole 35. When the isothermal heating cover 4 moves out of the heating cylinder 2, the cover plate 43 and the isothermal heating cover 4 can be driven to move away from the heating cylinder 2, facilitating the placement of the tubular ductile iron material in the heating cylinder 2 or the removal from the heating cylinder 2.

[0059] In some preferred embodiments, a second driving motor 48 is connected and provided on the upper side of the cover plate 43. The output end of the second driving motor 48 is connected with a first bevel gear. The rotating shaft 49 is rotatably penetrated through the cover plate 43 by means of a bearing. One end of the rotating shaft 49 is connected with a second bevel gear meshed with the first bevel gear. The other end of the rotating shaft 49 is connected with a ring 51 through a plurality of first support rods 50. The outer side of the ring 51 is respectively connected with the frame body 5 through a plurality of second support rods 52. A fan blade 56 is arranged on the second support rod 52.

[0060] Specifically, by opening the rotation of the second driving motor 48, in cooperation with the first bevel gear 45 and the second bevel gear 45, the rotation of the rotating shaft 49 is driven, and then, in cooperation with the first support rod 50, the ring 51, the second support rod 52 and the frame body 5, the isothermal heating cover 4 is driven to rotate outside the tubular ductile iron material 1.

[0061] In some preferred embodiments, a controller (not shown in the figure) is further included to control the opening and closing of the electromagnet 7, the solenoid valve 24, the first driving motor 47, the second driving motor 48, the heater 33, the hydraulic push rod 54, the first contact piece 28 and the second contact piece 29.

[0062] In some preferred embodiments, sliding blocks two 30 are arranged on both sides of the first sliding plate 6, and a second sliding groove 53 matched with the sliding blocks two 30 is arranged in the frame body 5 to make the sliding of the first sliding plate 6 stable.

[0063] In some preferred embodiments, a liquid nitrogen input device can be arranged on the heating cylinder 2 for inputting nitrogen into the heating cylinder 2 to reduce the oxidation effect of the ductile iron material during heat treatment.

[0064] The present application provides a use method of an isothermal quenching ductile iron heat treatment device as described in the above embodiments, including:

[0065] The tubular ductile iron material 1 to be subjected to heat treatment is placed on the centering clamping device 3;

[0066] The tubular ductile iron material 1 is centered and moved by the centering clamping device 3;

[0067] The isothermal heating hood 4 is evenly distributed on the inner and outer sides of the ductile iron pipe material 1 in a relative manner and rotates around the ductile iron pipe material 1 to heat the inner and outer walls of the ductile iron pipe material 1 to the same extent.

[0068] The specific implementation process is as follows:

[0069] In Example 1, after the isothermal heating hood 4 is removed from the heating cylinder 2, the ductile iron pipe material 1 to be heat-treated is placed on the first fixing plate 34, and the ductile iron pipe material is centered inside the heating cylinder 2 through the centering clamping device 3, which facilitates uniform heating when the isothermal heating hood 4 rotates;

[0070] After the tubular ductile iron material 1 is placed, the cover plate 43 is moved downward into the heating cylinder 2, and the fixed height of the downward movement of the cover plate 43 is adjusted according to the height of the tubular ductile iron material 1. At this time, the first contact block 26 can abut against the tubular ductile iron material 1. Then, the positioning and fixing of the isothermal heating cover 4 are completed. The electromagnet 7 is turned on, and the magnetic field generated by the electromagnet 7 repels the first contact block 26 and the second sliding plate 12 with the same magnetic polarity, causing the first contact block 26 to closely fit the rotating plate 31 on the isothermal heating cover 4. At the same time, the second sliding plate 12 slides away from the electromagnet 7, and the tube body 10 and the turntable 11 slide away from the electromagnet 7 in cooperation with the elastic telescopic rod 9, driving the isothermal heating cover 4 to slide away from the electromagnet 7 (towards the tubular ductile iron material 1) through the first sliding plate 6. Through the action of the screw rod 8, the turntable 11 rotates slowly. Through the action of the turntable 11 and the screw rod 8, it is avoided that the isothermal heating cover 4 moves too fast, which affects the deviation of the distance between the isothermal heating cover 4 and the tubular ductile iron material 1 during fixation and results in poor accuracy, thereby avoiding the situation of uneven heating during heating. During this process, the solenoid valve 24 is closed under the action of the controller. Due to the compression of the elastic telescopic rod 9, the sliding push rod 18 compresses the space in the first cylinder 17, and the air in the air tank 20 is compressed through the air hole 21, causing a continuous positive pressure to be generated in the air tank 20. During this process, the isothermal heating cover 4 approaches the tubular ductile iron material 1 until the second contact block 27 abuts against and compresses the tubular ductile iron material 1, causing the first contact block 26 to separate from the isothermal heating cover 4. When the first contact piece 28 and the second contact piece 29 just separate, the controller obtains the signal of the electrical signal being disconnected. At this time, the isothermal heating cover 4 just reaches the preset distance from the tubular ductile iron material 1, and then the relative distance between the isothermal heating cover 4 and the tubular ductile iron material 1 is fixed. When the controller obtains the signal of the electrical signal being disconnected, the controller directly opens the solenoid valve 24 through the preset program immediately, enabling the positive pressure in the air tank 20 to enter the second cylinder 22 to push the second piston 23, causing the insertion rod 15 to insert between the adjacent fixing rods 14, fixing the rotation of the turntable 11, and clamping and fixing the spiral blade of the turntable 11 on the screw rod 8, thereby fixing the position of the first sliding plate 6 on Figure 11 the lifting and lowering, and then fixing the position of the isothermal heating cover 4, automatically fixing when the distance between the isothermal heating cover 4 and the tubular ductile iron material 1 reaches the preset distance. When fixing the positions of multiple isothermal heating covers 4 simultaneously, it is more accurate and does not require manual operation for such high-precision operations of fixing the isothermal heating cover 4. Moreover, it can effectively adapt to tubular ductile iron materials 1 of different sizes and different thicknesses at the same time, improving the applicable range and the effect of uniform heating;

[0071] After fixing all the isothermal heating covers 4 around the tubular ductile iron material 1, whether inside or outside the tubular ductile iron material 1, the controller simultaneously controls the closing of the solenoid valve 24 and changes the magnetic field polarity of the electromagnet 7. With the latch rod 15 keeping the turntable 11 fixed, the electromagnet 7 simultaneously attracts the first contact block 26 and the second sliding plate 12. By attracting the first contact block 26, the second contact block 27 moves away from the tubular ductile iron material 1 and houses it in the isothermal heating cover 4, preventing the isothermal heating cover 4 from rubbing against the rotating tubular ductile iron material 1. On the other hand, by attracting the second sliding plate 12, with the first sliding plate 6 stationary, the elastic telescopic rod 9 is stretched, creating a negative pressure in the air tank 20;

[0072] By turning on the drive motor two 48 to drive the rotation of the rotating shaft 49, cooperating with the first support rod 50, the ring 51, and the second support rod 52 to drive the rotation of multiple frames 5, and cooperating with the first sliding plate 6, the isothermal heating cover 4 rotates synchronously on the inner and outer walls of the tubular ductile iron material 1 respectively. By turning on the heater 33, in some embodiments, the heater 33 can be a heating wire. By heating the isothermal heating cover 4 with the same power generated by all heaters 33, at any moment, the inner and outer walls of any part of the tubular ductile iron material 1 covered by the isothermal heating cover 4 are heated to the same degree. Compared with the prior art where only the outer wall of the tubular ductile iron material 1 is heated, the uniformity of heat treatment is effectively improved, and the heat treatment effect is enhanced;

[0073] When the second support rod 52 rotates, it drives the fan blade 56 to rotate faster, accelerating air flow, enabling the heat inside the tubular ductile iron material 1 to exchange air with the outside of the tubular ductile iron material 1, improving the balance of the temperature inside and outside the tubular ductile iron material 1 as much as possible, and preventing the accumulation of temperature inside the tubular ductile iron material 1 from causing uneven heating inside and outside the tubular ductile iron material 1;

[0074] Meanwhile, part of the heat inside the isothermal heating cover 4 can be conducted to the outside of the isothermal heating cover 4 through the heat-conducting metal plate 32, that is, indirectly heat the air in the heating cylinder 2 and increase the gas flow rate in the heating cylinder 2. Since the present application does not heat any position of the ductile cast iron material 1 simultaneously, the above solution avoids the situation that the area of the ductile cast iron material 1 not heated by the isothermal heating cover 4 is cooled and the heating effect is reduced. After the heating of the ductile cast iron material 1 is completed, the heater 33 is turned off, and cooling is required according to the temperature reduction procedure after heat treatment. The isothermal heating cover 4 is rotated in the reverse direction by reversely turning on the driving motor two 48. Since the heat-conducting metal plate 32 is arranged in a fan-shaped structure, the rotating plate 31 will be automatically opened. In specific implementation, the spring hinge between the rotating plate 31 and the isothermal heating cover 4 is a limiting spring hinge that limits a certain angle, avoiding the situation that the rotating plate 31 is opened too large and the ductile cast iron material 1 is cooled too quickly. Furthermore, the opening angles of the rotating plates 31 on the inner and outer sides of the ductile cast iron material 1 are the same, so that the gas flow rates entering the isothermal heating cover 4 are also nearly the same. Therefore, the cooling rates of the inner and outer walls of the ductile cast iron material 1 are also nearly the same, thereby improving the cooling uniformity effect of the inner and outer walls of the ductile cast iron material 1;

[0075] When the heating of the ductile cast iron material 1 is completed, only the solenoid valve 24 needs to be opened, and the suction force generated by the negative pressure in the gas tank 20 can extract the air in the cylinder two 22, so that the plug rod 15 releases the fixation of the disc and the first sliding plate 6. With the attraction of the electromagnet 7 to the second sliding plate 12, it is convenient to move the first sliding plate 6 and the isothermal heating cover 4 away from the ductile cast iron material 1 for reset, facilitating the next heat treatment operation.

[0076] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, it will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0077] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those skilled in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they should all fall within the protection scope of the present invention.

Claims

1. An austempered ductile iron heat treatment device for performing austempering heat treatment on tubular ductile iron materials (1), characterized in that, Including: A heating cylinder (2), a centering clamping device (3), and an isothermal heating cover (4); The centering clamping device (3) is arranged at the bottom side inside the heating cylinder (2) and is used for centering and fixing the bottom end of the ductile cast iron material (1); The isothermal heating cover (4) can be arranged inside the heating cylinder (2), and a plurality of them are evenly distributed along the circumferential direction on the inner side and the outer side of the ductile cast iron material (1) respectively; The isothermal heating cover (4) can rotate along the circumferential direction on the outer side and the inner side of the ductile cast iron material (1) simultaneously, so that the inner and outer walls of the ductile cast iron material (1) are heated to the same degree simultaneously; On one side of one end of the heating cylinder (2), a plurality of frames (5) are arranged along the circumferential direction. Both sides inside the frame (5) are respectively connected with a first sliding plate (6). The opposite sides of the two first sliding plates (6) are respectively connected with the isothermal heating cover (4). By sliding the first sliding plate (6) in the frame (5), the distance between the isothermal heating cover (4) and the ductile cast iron material (1) is adjusted; Electromagnets (7) are respectively connected to both ends of the frame (5) through support plates (55). A screw rod (8) is connected to the inner sides of both ends of the frame (5). An elastic telescopic rod (9) is connected to the side of the first sliding plate (6) facing the electromagnet (7). A tube body (10) is connected to the inner side of the elastic telescopic rod (9). A turntable (11) is connected to the inner side of the tube body (10) through a bearing. The turntable (11) is sleeved on the outer side of the screw rod (8), and the inner side of the turntable (11) is matched with the screw rod (8). A second sliding plate (12) is connected to one side of the first sliding plate (6) through two symmetrically arranged elastic telescopic rods (9). The second sliding plate (12) is made of a magnetic material that can be attracted by the electromagnet (7). A fixing component (13) for fixing the turntable (11) is arranged on one of the elastic telescopic rods (9).

2. The device according to claim 1, characterized in that, The fixed component (13) includes a plurality of fixed rods (14) provided at the lower side edge position of the turntable (11) and a latch rod (15) slidably provided on one of the elastic telescopic rods (9). A fixing ring (16) is provided at the lower side of the fixed rod (14). One of the elastic telescopic rods (9) includes a first cylinder (17), a sliding push rod (18) and a first piston (19). One end of the first cylinder (17) is connected to the first sliding plate (6). The sliding push rod (18) is slidably inserted into one end of the first cylinder (17) and connected to the first piston (19). An air tank (20) is fixedly provided in the first cylinder (17). An air hole (21) is provided at one end of the air tank (20) close to the sliding push rod (18). A second cylinder (22) is embedded at one end of the inner side of the first cylinder (17) away from the sliding push rod (18). One end of the latch rod (15) is slidably inserted into the second cylinder (22) and connected to a second piston (23). A solenoid valve (24) communicating with the first cylinder (17) is provided at one end of the second cylinder (22) away from the latch rod (15). The other end of the latch rod (15) can be inserted between adjacent fixed rods (14).

3. The device according to claim 2, characterized in that, One end of the isothermal heating cover (4) close to the frame body (5) is provided with a pressing rod (25) penetrating through. A first contact block (26) is connected to the end of the pressing rod (25) outside the isothermal heating cover (4). A second contact block (27) is connected to the other end of the pressing rod (25). A first contact piece (28) is provided on one side of the first contact block (26). A second contact piece (29) capable of abutting against the first contact piece (28) is provided on the outer side of the isothermal heating cover (4). The first contact block (26) is made of a magnetic material that can be attracted by the electromagnet (7).

4. The device according to claim 3, characterized in that, The top wall of the isothermal heating cover (4) is a rotatable rotating plate (31). One end of the rotating plate (31) is hinged to the isothermal heating cover (4) through a spring hinge. The other side of the rotating plate (31) can abut against the isothermal heating cover (4). A fan-shaped heat-conducting metal plate (32) capable of extending to the inner and outer sides of the isothermal heating cover (4) is embedded in the rotating plate (31). A heater (33) is provided on one side of the rotating plate (31) inside the isothermal heating cover (4).

5. The device according to claim 1, characterized in that, The centering clamping device (3) includes a plurality of first fixing plates (34). One end of each of the plurality of first fixing plates (34) is connected to the inner wall of the heating cylinder (2). The other ends of the first fixing plates (34) are fixed together and connected to the electric push rod (57). The connection line of the other ends of the plurality of first fixing plates (34) far away from each other is a regular polygon. A sliding hole (35) is provided on the first fixing plate (34). Sliding columns (36) are provided at both ends of the sliding hole (35). A first slider (37) is slidably sleeved on the outer side of the sliding column (36). One end of the first slider (37) extends outside the sliding hole (35) and abuts against the ductile iron material (1). The other end of the first slider (37) is hinged with a traction rod (38). The other end of the traction rod (38) is hinged to the edge of the output end of the electric push rod (57).

6. The device according to claim 1, characterized in that, The lower end of the heating cylinder (2) is connected with a bottom plate (39) through support feet. Hydraulic push rods (54) are respectively connected to the edge positions of the upper end of the bottom plate (39) through columns. The output end of the hydraulic push rod (54) is connected with a lifting frame (40). Slide grooves one (41) are provided on both inner walls of the lifting frame (40). A second fixing plate (42) is connected to the inner wall of the slide groove one (41). A cover plate (43) for closing the upper end of the heating cylinder (2) is connected to the lower side of the second fixing plate (42). A rack (44) capable of penetrating one end of the lifting frame (40) is connected to one side of the second fixing plate (42). A sliding hole (35) matching with the rack (44) is provided on the lifting frame (40). A gear (45) is rotatably provided in the sliding hole (35). A rotating seat (46) rotatably connected to both sides of the gear (45) is connected to the lower side of the lifting frame (40). A first driving motor (47) is connected to one side of one of the rotating seats (46). The output end of the first driving motor (47) penetrates the rotating seat (46) and is connected to the gear (45).

7. The device according to claim 6, characterized in that, A second driving motor (48) is connected to the upper side of the cover plate (43). The output end of the second driving motor (48) is connected with a first bevel gear. A rotating shaft (49) is rotatably penetrated through the cover plate (43) through a bearing. A second bevel gear meshing with the first bevel gear is connected to one end of the rotating shaft (49). A ring (51) is connected to the other end of the rotating shaft (49) through a plurality of first support rods (50). The outer side of the ring (51) is respectively connected to the frame body (5) through a plurality of second support rods (52). A fan blade (56) is provided on the second support rod (52).

8. A method for using a heat treatment device for austempered ductile iron according to any one of claims 1-7, characterized in that, Comprising: The ductile iron material (1) to be heat-treated is placed on the centering clamping device (3); The ductile iron material (1) is centered and moved by the centering clamping device (3); The isothermal heating cover (4) is evenly distributed on the inner and outer sides of the ductile iron material (1) opposite to each other and rotates around the ductile iron material (1) to heat the inner and outer walls of the ductile iron material (1) to the same degree.

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