Isothermal quenching nodular cast iron heat treatment equipment and use method thereof

Abstract

The invention discloses isothermal quenching nodular cast iron heat treatment equipment and a using method thereof, and relates to the field of heat treatment, the isothermal quenching nodular cast iron heat treatment equipment is used for carrying out isothermal heat treatment on a tubular nodular cast iron material, and the isothermal quenching nodular cast iron heat treatment equipment comprises a heating cylinder, a centering clamping device and an isothermal heating cover; the centering clamping device is arranged on the bottom side in the heating cylinder and is used for centering and fixing the bottom end of the tubular nodular cast iron material; the isothermal heating covers can be arranged in the heating cylinder, and the multiple isothermal heating covers are evenly distributed on the inner side and the outer side of the tubular nodular cast iron material in the circumferential direction. Compared with the prior art, the isothermal heating cover has the advantages that the inner wall and the outer wall of any position of the tubular nodular cast iron material can be covered with the same isothermal heating cover, and the isothermal heating cover rotates on the outer side of the tubular nodular cast iron material in the circumferential direction; uniform heat treatment of the inner wall and the outer wall of the nodular cast iron material is achieved, and the heat treatment effect is improved.

Description

Technical Field

[0001] The invention relates to the field of heat treatment, and in particular to isothermal quenching ductile iron heat treatment equipment and a use method thereof. Background Art

[0002] Ductile iron pipe fittings are made of magnesium or rare earth magnesium combined with gold nodulizer added to molten iron before pouring to spheroidize graphite and reduce stress concentration, so that the pipe has the advantages of high strength, high elongation, impact resistance, corrosion resistance, good sealing, etc. In order to further reduce the internal stress generated by ductile iron pipe fittings during the casting and cooling process, ductile iron pipe fittings need to be heat treated.

[0003] At present, when heat-treating ductile iron of a tube type, the ductile iron material is generally placed in a heating container and heated by a heater on the inner wall of the heating container, such as the disclosed patent application CN116590511B. However, this solution mainly heats the outer surface of the ductile iron at the beginning of heating, and the inner side of the tube material starts to be heated after a certain heating time, and it is impossible to effectively heat the inner wall and the outer side 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 that the inner wall and the outer side of ductile iron cannot be effectively and evenly heated in the prior art, resulting in uneven heating, and to provide an isothermal quenching ductile iron heat treatment equipment and a method of using the equipment, which can effectively and to the same extent heat the inner wall and the outer side of the ductile iron material.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: an isothermal quenching ductile iron heat treatment equipment, which is used to perform isothermal heat treatment on tubular ductile iron materials, comprising: a heating cylinder, a centering clamping device, and an isothermal heating cover; The centering clamping device is arranged at the bottom side of the heating cylinder and is used to center and fix 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; The isothermal heating cover can rotate in the circumferential direction at the outer side and the inner side of the tubular ductile iron material at the same time, so that the inner and outer walls of the tubular ductile iron material are heated at the same time to the same degree.

[0006] Preferably, a plurality of frames arranged along the circumferential direction are provided on one side of one end of the heating cylinder, and first sliding plates are respectively connected to both sides of the frames, and the opposite sides of the two first sliding plates are respectively connected to the isothermal heating hood, and the distance between the isothermal heating hood and the tubular ductile iron is adjusted by sliding the first sliding plate in the frame.

[0007] Preferably, electromagnets are connected to both ends of the frame through support plates, spiral rods are connected to the inner sides of both ends of the frame, an elastic telescopic rod is connected to the side of the first sliding plate facing the electromagnet, a tube body is connected to the inner side of the elastic telescopic rod, a turntable is connected to the inner side of the tube body through a bearing, the turntable is sleeved on the outer side of the spiral rod, and the inner side of the turntable cooperates with the spiral rod, a second sliding plate is connected to one side of the first sliding plate through two symmetrically arranged elastic telescopic rods, the second sliding plate is made of magnetic material that can be attracted by the electromagnet, and one of the elastic telescopic rods is provided with a fixing component for fixing the turntable.

[0008] Preferably, the fixing assembly includes a plurality of fixing rods arranged at the lower edge position of the turntable and a latch rod slidably arranged on one of the elastic telescopic rods, a fixing ring is provided on the lower side of the fixing rod, one of the elastic telescopic rods includes a cylinder body 1, a sliding push rod and a piston 1, one end of the cylinder body 1 is connected to the first sliding plate, one end of the sliding push rod is slidably inserted into the cylinder body 1 and is connected to the piston 1, a gas tank is fixedly provided in the cylinder body 1, an air hole is provided at one end of the gas tank close to the sliding push rod, a cylinder body 2 is embedded in the inner side of the cylinder body 1 at one end away from the sliding push rod, one end of the latch rod is slidably inserted into the cylinder body 2 and is connected to the piston 2, an end of the cylinder body 2 away from the latch rod is provided with an electromagnetic valve communicated with the cylinder body 1, and the other end of the latch rod can be inserted between adjacent fixing rods.

[0009] Preferably, an extrusion rod is penetrated at one end of the isothermal heating cover close to the frame, and a first contact block is connected to one end of the extrusion rod outside the isothermal heating cover, and a second contact block is connected to the other end of the extrusion rod. A first contact piece is provided on one side of the first contact block, and a second contact piece that can resist the first contact piece is provided on the outer side of the isothermal heating cover, and the first contact block is made of a magnetic material that can be attracted by an electromagnet.

[0010] Preferably, the top wall of the isothermal heating hood is a rotatable rotating plate, one end of the rotating plate is hinged to the isothermal heating hood by a spring hinge, the other side of the rotating plate can be abutted against the isothermal heating hood, a fan-shaped heat-conducting metal plate that can extend to the inside and outside of the isothermal heating hood is embedded in the rotating plate, and a heater is provided on one side of the rotating plate inside the isothermal heating hood.

[0011] Preferably, the centering clamping device includes a plurality of fixed plates, one end of the plurality of fixed plates is connected to the inner wall of the heating cylinder, the other end of the fixed plates are fixed together and connected to the electric push rod, the connecting line of the plurality of fixed plates at the far end is a regular polygon, a sliding hole is provided on the fixed plate, sliding columns are provided at both ends of the sliding hole, a sliding block is provided on the outer sliding sleeve of the sliding column, one end of the sliding block extends to the outside of the sliding hole and abuts against the tubular ductile iron material, the other end of the sliding block is hingedly provided with a traction rod, and the other end of the traction rod is hinged to the edge of the output end of the electric push rod.

[0012] Preferably, the lower end of the heating cylinder is connected to a base plate via a supporting foot, and the edge positions of the upper end of the base plate are respectively connected to hydraulic push rods via columns, and the output end of the hydraulic push rod is connected to a lifting frame, and both inner walls of the lifting frame are provided with a slide groove 1, and the inner wall of the slide groove 1 is connected with a fixed plate 2, and the lower side of the fixed plate 2 is connected with a cover plate for closing the upper end of the heating cylinder, and one side of the fixed plate 2 is connected with a rack that can pass through one end of the lifting frame, and the lifting frame is provided with a sliding hole that matches the rack, and a gear is rotatably provided in the sliding hole, and the lower side of the lifting frame is connected with a rotating seat rotatably connected to both sides of the gear, and one side of one of the rotating seats is connected with a driving motor 1, and the output end of the driving motor 1 passes through the rotating seat and is connected with the gear.

[0013] Preferably, a driving motor 2 is connected to the upper side of the cover plate, a bevel gear 1 is connected to the output end of the driving motor 2, a rotating shaft is provided on the cover plate for rotation through a bearing, a bevel gear 2 which is meshed with the bevel gear 1 is connected to one end of the rotating shaft, a circular ring is connected to the other end of the rotating shaft through a plurality of first support rods, the outer sides of the circular ring are respectively connected to the frame through a plurality of second support rods, and fan blades are provided on the second support rods.

[0014] Preferably, the present application proposes a method for using the isothermal quenching ductile iron heat treatment equipment as described in the above embodiment, comprising: The tubular ductile iron material to be heat treated is placed on a central clamping device; The tubular ductile iron material is moved centrally by a central clamping device; The isothermal heating covers are evenly distributed on the inner and outer sides of the tubular ductile iron material and rotate around the tubular ductile iron material to heat the inner and outer walls of the tubular ductile iron material to the same degree.

[0015] The advantages of the present invention over the prior art are that when the tubular ductile iron material is placed inside the heating cylinder, the inner wall and the outer wall of any position of the tubular ductile iron material can be covered with the same isothermal heating cover, and as the isothermal heating cover rotates along the circumferential direction outside the tubular ductile iron material, the inner wall and the outer wall of the ductile iron material can be uniformly heat treated to the same degree, thereby improving the heat treatment effect; When the tubular ductile iron material is placed on the central clamping device, the isothermal heating covers on the inner and outer sides of the tubular ductile iron can be automatically adjusted to be fixed in position after being close to the tubular ductile iron, so that the position of the isothermal heating covers can be conveniently adjusted for tubular ductile irons of different sizes and thicknesses; For tubular ductile iron materials of different sizes or thicknesses, through the action of the extrusion rod, when the isothermal heating cover is used to adjust the distance relative to the tubular ductile iron material during heating, when the second contact block and the ductile iron material are pressed against and squeezed, the first contact piece and the second contact piece are separated, and the distance between the isothermal heating cover and the tubular ductile iron material is automatically fixed. At this time, it means that the isothermal heating cover has reached the preset distance between the isothermal heating cover and the tubular ductile iron material. The purpose is to avoid the situation that the isothermal heating cover is too close to the tubular ductile iron material, causing the isothermal heating cover to scratch the tubular ductile iron material, or too far away, causing the isothermal heating cover to heat the tubular ductile iron material. The distance between the isothermal heating cover and the tubular ductile iron material is adjusted to be almost equal; When the electromagnet is turned on, on the one hand, the first contact block can always fit the isothermal heating cover by the same polarity repulsion during the process of fixing the position of the isothermal heating cover, so that when the second contact block and the tubular ductile iron are against each other, the position of the isothermal heating cover is fixed. On the other hand, the second sliding plate can be made to slide toward the first sliding plate by the same polarity repulsion, and the elastic telescopic rod and the first sliding plate provide power when the isothermal heating cover moves toward the tubular ductile iron material. When the electromagnet is turned on with reverse polarity, the second contact block is attracted, so that after the isothermal heating cover is fixed, the first contact block and the ductile iron material are separated to avoid scratching the ductile iron material. On the other hand, the suction force of the second sliding plate generates negative pressure in the gas tank, and the fixation of the isothermal heating cover position can be unlocked by only opening the solenoid valve. Through the effect of the heat-conducting metal plate, when treating the tubular ductile iron, a small part of the heat in the isothermal heating cover can be transferred to the inside of the heating tube, so as to avoid a large temperature drop of the tubular ductile iron material when the temperature difference between the inside and outside of the isothermal heating cover is large, thereby affecting the heating effect of the tubular ductile iron material. When cooling the ductile iron material after the heat treatment, the isothermal heating cover can be reversed in the heating tube, and the inner and outer walls of the ductile iron material can be evenly cooled through the arc-shaped heat-conducting metal plate; When the isothermal heating cover rotates, the second support rod rotates to drive the fan blades to rotate, thereby increasing the air flow rate inside the tubular ductile iron material, improving the temperature balance effect inside and outside the inertial ductile iron material, and avoiding heat accumulation inside the ductile iron material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention from another viewing angle; Figure 3 It is a schematic diagram of the internal three-dimensional structure of the heating tube of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of the first sliding plate of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the centering clamping device of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the frame of the present invention; Figure 7 It is a structural schematic diagram of one side of the frame of the present invention; Figure 8 The present invention Figure 7 Schematic diagram of the cross-sectional structure at the AA position; Fig. 9 The present invention Figure 7 Schematic diagram of the cross-sectional structure at the middle BB position; Fig.10 is a schematic diagram of the three-dimensional structure of the first sliding plate of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the spiral rod of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the second sliding plate of the present invention.

[0017] Fig.13 The present invention Figure 8 Schematic diagram of the enlarged structure at position A in the middle.

[0018] Fig.14 The present invention Fig.13 Schematic diagram of the enlarged structure at position B in the middle.

[0019] Fig.15 The present invention Fig.13 Schematic diagram of the enlarged structure at position C in the middle.

[0020] Fig.16 The present invention Figure 1 Schematic diagram of the enlarged structure at position D in the middle.

[0021] As shown in the figure: 1. Tube-shaped ductile iron material; 2. Heating tube; 3. Centering clamping device; 4. Isothermal heating cover; 5. Frame; 6. First sliding plate; 7. Electromagnet; 8. Screw rod; 9. Elastic telescopic rod; 10. Tube; 11. Turntable; 12. Second sliding plate; 13. Fixing assembly; 14. Fixing rod; 15. Latch rod; 16. Fixing ring; 17. Cylinder body 1; 18. Sliding push rod; 19. Piston 1; 20. Gas tank; 21. Air hole; 22. Cylinder body 2; 23. Piston 2; 24. Solenoid valve; 25. Extrusion rod; 26. First contact block; 27. Second contact block; 28. First contact sheet; 29. Second contact piece; 30. Slider 2; 31. Rotating plate; 32. Heat-conducting metal plate; 33. Heater; 34. Fixed plate 1; 35. Sliding hole; 36. Sliding column; 37. Slider 1; 38. Drawbar; 39. Bottom plate; 40. Lifting frame; 41. Slide 1; 42. Fixed plate 2; 43. Cover plate; 44. Rack; 45. Gear; 46. Rotating seat; 47. Drive motor 1; 48. Drive motor 2; 49. Rotating shaft; 50. First support rod; 51. Ring; 52. Second support rod; 53. Slide 2; 54. Hydraulic push rod; 55. Support plate; 56. Fan blade; 57. Electric push rod.

[0022] The accompanying drawings are provided for further understanding and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention, but do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof are intended to cover non-exclusive inclusions.

[0024] Please see attached Figure 1-16 , an isothermal quenching ductile iron heat treatment equipment, used for isothermal heat treatment of a tubular ductile iron material 1, comprising: a heating cylinder 2, a centering clamping device 3, an isothermal heating cover 4; The centering clamping device 3 is arranged at the bottom side of the heating cylinder 2, and is used to center and fix the bottom end of the tubular ductile 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 tubular ductile iron material 1; The isothermal heating cover 4 can rotate in the circumferential direction at the outside and inside of the tubular ductile iron material 1 at the same time, so that the inner and outer walls of the tubular ductile iron material 1 are heated at the same time to the same extent.

[0025] In some preferred embodiments, one side of one end of the heating cylinder 2 is provided with a plurality of frames 5 arranged along the circumferential direction, and first sliding plates 6 are respectively connected to both sides of the frame 5, and the two sides of the first sliding plates 6 facing each other are respectively connected to the isothermal heating hood 4, and the distance between the isothermal heating hood 4 and the tubular ductile iron is adjusted by sliding the first sliding plate 6 in the frame 5.

[0026] In some preferred embodiments, the two ends of the frame 5 are respectively connected with electromagnets 7 through support plates 55, the inner sides of the two ends of the frame 5 are connected with screw rods 8, the first sliding plate 6 is connected with an elastic telescopic rod 9 on the side facing the electromagnet 7, the inner side of the elastic telescopic rod 9 is connected with a tube body 10, the inner side of the tube body 10 is connected with a turntable 11 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 cooperates with the screw rod 8, one side of the first sliding plate 6 is connected with a second sliding plate 12 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, and one of the elastic telescopic rods 9 is provided with a fixing component 13 for fixing the turntable 11.

[0027] In some preferred embodiments, the fixing assembly 13 includes a plurality of fixing rods 14 arranged at the lower edge of the turntable 11 and a latch rod 15 slidably arranged on one of the elastic telescopic rods 9, a fixing ring 16 is arranged on the lower side of the fixing rod 14, and one of the elastic telescopic rods 9 includes a cylinder 17, a sliding push rod 18 and a piston 19, one end of the cylinder 17 is connected to the first sliding plate 6, and the sliding push rod 18 is slidably inserted into one end of the cylinder 17 and the piston 19. 9 is connected, a gas tank 20 is fixedly arranged in the cylinder body 17, an air hole 21 is arranged at one end of the gas tank 20 close to the sliding push rod 18, a cylinder body 22 is embedded at one end of the inner side of the cylinder body 17 away from the sliding push rod 18, one end of the latch rod 15 is slidably inserted into the cylinder body 22 and connected with a piston 23, an end of the cylinder body 22 away from the latch rod 15 is provided with an electromagnetic valve 24 connected with the cylinder body 17, and the other end of the latch rod 15 can be inserted between adjacent fixed rods 14.

[0028] In some preferred embodiments, an extrusion rod 25 is penetrated by one end of the isothermal heating cover 4 close to the frame body 5, and a first contact block 26 is connected to one end of the extrusion rod 25 outside the isothermal heating cover 4, and a second contact block 27 is connected to the other end of the extrusion rod 25. A first contact piece 28 is provided on one side of the first contact block 26, and a second contact piece 29 that can resist 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.

[0029] In some preferred embodiments, the top wall of the isothermal heating hood 4 is a rotatable rotating plate 31, one end of the rotating plate 31 is hinged to the isothermal heating hood 4 by a spring hinge, and the other side of the rotating plate 31 can be abutted against the isothermal heating hood 4. A fan-shaped heat-conducting metal plate 32 that can extend to the inside and outside of the isothermal heating hood 4 is embedded in the rotating plate 31, and a heater 33 is provided on one side of the rotating plate 31 inside the isothermal heating hood 4.

[0030] In some preferred embodiments, the centering clamping device 3 includes a plurality of fixed plates 34, one end of each of the plurality of fixed plates 34 is connected to the inner wall of the heating tube 2, and the other end of each of the fixed plates 34 is fixed together and connected to the electric push rod 57. The connecting line of the plurality of fixed plates 34 at the far end is a regular polygon. A sliding hole 35 is provided on the fixed plate 34, and sliding columns 36 are provided at both ends of the sliding hole 35. A sliding sleeve 37 is provided on the outer side of the sliding column 36. One end of the sliding block 37 extends to the outer side of the sliding hole 35 and abuts against the tubular ductile iron material 1. The other end of the sliding block 37 is hingedly provided with a traction rod 38, and the other end of the traction rod 38 is hingedly connected to the edge of the output end of the electric push rod 57.

[0031] Specifically, the tubular ductile iron material 1 to be heat treated is placed on the upper side of the fixed plate 34, and is placed as centered as possible in the heating tube 2 by visual inspection, and the multiple sliders 37 are all on the outside of the tubular ductile iron material 1 at this time, and the hydraulic push rod 54 is turned on to push one end of the multiple traction rods 38 away from one end of the tubular ductile iron material 1, thereby driving the multiple sliders 37 to slide steadily in the sliding hole 35 and on the outside of the sliding column 36 at the same time, and then the edge position of the tubular ductile iron is squeezed by the slider 37 at the same time, until the multiple sliders 37 are all against the tubular ductile iron material 1, so that the tubular ductile iron material 1 is centered in the heating tube 2, which is convenient for uniform heating when the isothermal heating cover 4 rotates.

[0032] In some preferred embodiments, the lower end of the heating cylinder 2 is connected with a base plate 39 through a supporting foot, and the edge positions of the upper end of the base plate 39 are respectively connected with hydraulic push rods 54 through columns, and the output end of the hydraulic push rod 54 is connected with a lifting frame 40, and the two inner walls of the lifting frame 40 are provided with a slide groove 1 41, and the inner wall of the slide groove 1 41 is connected with a fixed plate 2 42, and the lower side of the fixed plate 2 42 is connected with a cover plate 43 for closing the upper end of the heating cylinder 2, and one side of the fixed plate 2 42 is connected with a rack 44 that can pass through one end of the lifting frame 40, and the lifting frame 40 is provided with a sliding hole 35 that matches the rack 44, and a gear 45 is rotatably provided in the sliding hole 35, and the lower side of the lifting frame 40 is connected with a rotating seat 46 that is rotatably connected to both sides of the gear 45, and one side of one of the rotating seats 46 is connected with a driving motor 1 47, and the output end of the driving motor 1 47 passes through the rotating seat 46 and is connected with the gear 45.

[0033] Specifically, by opening the hydraulic push rod 54, the lifting and lowering of the lifting frame 40 can be adjusted, and then the fixing plate 2 42 and the rotating shaft 49 are cooperated to adjust the lifting and lowering of the isothermal heating cover 4 on the heating tube 2 and out of the heating tube 2. By turning on the driving motor 1 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 tube 2, the cover plate 43 and the isothermal heating cover 4 can be driven away from the heating tube 2, so that the tubular ductile iron material is placed in the heating tube 2 or taken out of the heating tube 2.

[0034] In some preferred embodiments, a drive motor 2 48 is connected to the upper side of the cover plate 43, and a bevel gear 1 is connected to the output end of the drive motor 2 48. A rotating shaft 49 is rotatably provided on the cover plate 43 through a bearing, and one end of the rotating shaft 49 is connected to a bevel gear 2 meshing with the bevel gear 1. The other end of the rotating shaft 49 is connected to a ring 51 through a plurality of first support rods 50, and the outer sides of the ring 51 are respectively connected to the frame 5 through a plurality of second support rods 52, and the second support rods 52 are provided with fan blades 56.

[0035] Specifically, by turning on the rotation of the second driving motor 48, the bevel gears 451 and 452 are coordinated to drive the rotation of the rotating shaft 49, and then the first support rod 50, the ring 51, the second support rod 52, and the frame 5 are coordinated to drive the isothermal heating cover 4 to rotate outside the tubular ductile iron material 1.

[0036] In some preferred embodiments, a controller (not shown in the figure) is also included to control the opening and closing of the electromagnet 7, the solenoid valve 24, the drive motor 1 47, the drive motor 2 48, the heater 33, the hydraulic push rod 54, the first contact piece 28 and the second contact piece 29.

[0037] In some preferred embodiments, two sliding blocks 30 are provided on both sides of the first sliding plate 6 , and two sliding grooves 53 cooperating with the two sliding blocks 30 are provided in the frame 5 to ensure stable sliding of the first sliding plate 6 .

[0038] In some preferred embodiments, a liquid nitrogen input device may be provided 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.

[0039] The present application proposes a method for using the austempering ductile iron heat treatment equipment as described in the above embodiment, comprising: The tubular ductile iron material 1 to be heat treated is placed on a central clamping device 3; The tubular ductile iron material 1 is moved centrally by a central clamping device 3; The isothermal heating hoods 4 are evenly distributed on the inner and outer sides of the tubular ductile iron material 1 and rotate around the tubular ductile iron material 1 to heat the inner and outer walls of the tubular ductile iron material 1 to the same extent.

[0040] The specific implementation process is as follows: Embodiment 1, after the isothermal heating cover 4 is removed from the heating cylinder 2, the tubular ductile iron material 1 to be heat treated is placed on a fixed plate 34, and the tubular ductile iron material is placed in the center of the heating cylinder 2 by the centering clamping device 3, so as to facilitate uniform heating when the isothermal heating cover 4 rotates; After the tubular ductile iron material 1 is placed, the cover plate 43 is moved downward into the heating tube 2, and the fixed height 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 be against the tubular ductile iron material 1, and then the positioning and fixing of the isothermal heating cover 4 is completed, and the electromagnet 7 is turned on. The magnetic field generated by the electromagnet 7 repels the magnetic fields of the first contact block 26 and the second sliding plate 12 with the same polarity, so that the first contact block 26 is closely attached to the rotating plate 31 on the isothermal heating cover 4, and the second sliding plate 12 is away from the electromagnet 7. The elastic telescopic rod 9 is used to slide the tube body 10 and the turntable 11 away from the electromagnet 7, and the isothermal heating cover 4 is driven to slide away from the electromagnet 7 (close to the tubular ductile iron material 1) through the first sliding plate 6. The turntable 11 is slowly rotated by the action of the screw rod 8. The turntable 11 and the screw rod 8 are used to prevent the isothermal heating cover 4 from moving too fast, which will cause the isothermal heating cover 4 to deviate from the distance from the tubular ductile iron material 1 when fixed, thereby avoiding the situation where the above situation causes uneven heating during heating. In this process In the process, the solenoid valve 24 is closed by the action of the controller. Due to the compression of the elastic telescopic rod 9, the sliding push rod 18 squeezes the space in the cylinder 17, and squeezes the air in the gas tank 20 through the air hole 21, so that the positive pressure is continuously generated in the gas tank 20. In this process, the isothermal heating cover 4 approaches the tubular ductile iron material 1 until the second contact block 27 and the tubular ductile iron material 1 are abutted and squeezed, so that the first contact block 26 and the isothermal heating cover 4 begin to separate. When the first contact piece 28 and the second contact piece 29 are just separated, the controller obtains a signal that the electrical signal is disconnected. When the isothermal heating cover 4 just reaches the preset distance between it and the tubular ductile iron material 1, 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 electric signal being disconnected, the controller immediately opens the solenoid valve 24 through the preset program, so that the positive pressure in the gas tank 20 enters the cylinder 22 to push the piston 23, so that the latch rod 15 is inserted between the adjacent fixing rods 14, so that the rotation of the turntable 11 is fixed, and the spiral leaf of the turntable 11 on the spiral rod 8 is clamped and fixed, thereby fixing the first sliding plate 6 in Fig.11 The position of the isothermal heating cover 4 is fixed by lifting the upper and lower positions, and the isothermal heating cover 4 and the tubular ductile iron material 1 are automatically fixed when the preset distance is reached. It is more accurate when the positions of multiple isothermal heating covers 4 are fixed at the same time, and there is no need for manual operation to fix the isothermal heating cover 4, which is a high-requirement operation. At the same time, it can effectively adapt to tubular ductile iron materials 1 of different sizes and thicknesses, thereby improving the scope of application and the effect of uniform heating; After all the isothermal heating covers 4 around the tubular ductile iron material 1 are fixed, the solenoid valve 24 is closed and the magnetic field polarity of the electromagnet 7 is changed through the control of the controller at the same time, whether on the inside or outside of the tubular ductile iron material 1, and the electromagnet 7 simultaneously attracts the first contact block 26 and the second sliding plate 12 when the latch rod 15 is fixed to the turntable 11. By attracting the first contact block 26, the second contact block 27 is stored in the isothermal heating cover 4 far from the tubular ductile iron material 1, so as to avoid scratches when the isothermal heating cover 4 heats the tubular ductile iron material 1 and rotates. On the other hand, by attracting the second sliding plate 12, when the first sliding plate 6 is not moving, the elastic telescopic rod 9 is stretched to generate negative pressure in the gas tank 20; By turning on the second driving motor 48 to drive the rotation of the rotating shaft 49, the first support rod 50, the ring 51, and the second support rod 52 are cooperated to drive the multiple frames 5 to rotate, and the first sliding plate 6 is cooperated to make the isothermal heating cover 4 rotate synchronously on the inner wall and the outer wall 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, and the isothermal heating cover 4 is heated by generating the same power for all heaters 33, so that the inner wall and the outer wall of any part of the tubular ductile iron material 1 covered by the isothermal heating cover 4 at any time are heated to the same degree. Compared with the situation in the prior art where only the outer wall of the tubular ductile iron material 1 is heated, the uniformity of the heat treatment is effectively improved, and the heat treatment effect is improved; The fan blades 56 are driven to rotate when the second support rod 52 rotates to accelerate the air flow, so that the heat inside the tubular ductile iron material 1 is exchanged with the air outside the tubular ductile iron material 1, so as to improve the balance between the temperature inside and outside the tubular ductile iron material 1 as much as possible, and avoid the situation that the temperature accumulates inside the tubular ductile iron material 1, which affects the uneven heating inside and outside the tubular ductile iron material 1; At the same time, part of the heat inside the isothermal heating hood 4 can be conducted to the outside of the isothermal heating hood 4 through the heat-conducting metal plate 32, that is, the air in the heating tube 2 is indirectly heated and the gas flow rate in the heating tube 2 is increased. Since the present application does not heat any position of the tubular ductile iron material 1 at the same time, the above scheme is used to avoid the situation where the area of ​​the tubular ductile iron material 1 that is not heated by the isothermal heating hood 4 is cooled to reduce the heating effect. After the tubular ductile iron material 1 is heated, the heater 33 is turned off, and cooling is required according to the cooling procedure after the heat treatment, and the isothermal heating hood is turned on by reversely opening the drive motor 2 48. 4 reverse rotation, since the heat-conducting metal plate 32 is arranged in a fan-shaped structure, the rotating plate 31 will be automatically opened. In the specific implementation, the spring hinge between the rotating plate 31 and the isothermal heating cover 4 is a limit spring hinge with a certain angle, so as to avoid the situation where the rotating plate 31 is opened too much and the tubular ductile iron material 1 is cooled too quickly, and then the rotating plates 31 on the inner and outer sides of the tubular ductile iron material 1 are opened at the same angle, so that the gas flow rate entering the isothermal heating cover 4 is also almost the same, so that the cooling rate of the inner and outer walls of the tubular ductile iron material 1 is also almost the same, thereby improving the uniform cooling effect of the inner and outer walls of the tubular ductile iron material 1; When the tubular ductile iron material 1 is heated, it is only necessary to open the solenoid valve 24. The suction force generated by the negative pressure in the gas tank 20 can draw out the air in the cylinder body 22, so that the latch rod 15 releases the fixation of the disc and the first sliding plate 6. As the electromagnet 7 attracts the second sliding plate 12, it is easy to reset the first sliding plate 6 and the isothermal heating cover 4 away from the tubular ductile iron material 1, so as to facilitate the next heat treatment operation.

[0041] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0042] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An isothermal quenching ductile iron heat treatment equipment, used for isothermal heat treatment of tubular ductile iron material (1), characterized in that: include: A heating cylinder (2), a centering clamping device (3), and an isothermal heating cover (4); The centering clamping device (3) is arranged on the bottom side of the interior of the heating cylinder (2) and is used to center and fix the bottom end of the tubular ductile iron material (1); The isothermal heating hood (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); The isothermal heating cover (4) can rotate simultaneously in a circumferential direction on the outside and inside of the tubular ductile iron material (1), so that the inner and outer walls of the tubular ductile iron material (1) are heated simultaneously to the same degree.

2. The device according to claim 1, characterized in that A plurality of frames (5) arranged in a circumferential direction are provided on one side of one end of the heating cylinder (2); first sliding plates (6) are respectively connected to the two sides of the frame (5); the two sides of the first sliding plates (6) facing each other are respectively connected to the isothermal heating cover (4); and the distance between the isothermal heating cover (4) and the tubular ductile iron material (1) is adjusted by sliding the first sliding plates (6) in the frame (5).

3. The device according to claim 2, characterized in that The two ends of the frame (5) are connected to electromagnets (7) via support plates (55), the inner sides of the two ends of the frame (5) are connected to spiral rods (8), the first sliding plate (6) is connected to an elastic telescopic rod (9) on the side facing the electromagnet (7), the inner side of the elastic telescopic rod (9) is connected to a tube (10), the inner side of the tube (10) is connected to a turntable (11) via a bearing, the turntable (11) is sleeved on the outer side of the spiral rod (8), and the inner side of the turntable (11) cooperates with the spiral rod (8), one side of the first sliding plate (6) is connected to a second sliding plate (12) via 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), and one of the elastic telescopic rods (9) is provided with a fixing component (13) for fixing the turntable (11).

4. The device according to claim 3, characterized in that The fixing assembly (13) comprises a plurality of fixing rods (14) arranged at the lower edge of the turntable (11) and a latch rod (15) slidably arranged on one of the elastic telescopic rods (9); a fixing ring (16) is provided on the lower side of the fixing rod (14); one of the elastic telescopic rods (9) comprises a cylinder body (17), a sliding push rod (18) and a piston (19); one end of the cylinder body (17) is connected to the first sliding plate (6); one end of the sliding push rod (18) is slidably inserted into the cylinder body (17) and connected to the piston (19); A gas tank (20) is fixedly arranged in the cylinder body 1 (17), and an air hole (21) is arranged at one end of the gas tank (20) close to the sliding push rod (18). A cylinder body 2 (22) is embedded in the inner side of the cylinder body 1 (17) at one end away from the sliding push rod (18). One end of the latch rod (15) is slidably inserted into the cylinder body 2 (22) and connected with a piston 2 (23). An electromagnetic valve (24) is arranged at one end of the cylinder body 2 (22) away from the latch rod (15) and connected to the cylinder body 1 (17). The other end of the latch rod (15) can be inserted between adjacent fixed rods (14).

5. The device according to claim 4, characterized in that An extrusion rod (25) is provided through one end of the isothermal heating cover (4) close to the frame (5); one end of the extrusion rod (25) outside the isothermal heating cover (4) is connected to a first contact block (26); the other end of the extrusion rod (25) is connected to a second contact block (27); 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); and the first contact block (26) is made of a magnetic material capable of being attracted by the electromagnet (7).

6. The device according to claim 5, 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) by a spring hinge, the other side of the rotating plate (31) can abut against the isothermal heating cover (4), and a fan-shaped heat-conducting metal plate (32) that can extend to the inside and outside of the isothermal heating cover (4) is embedded in the rotating plate (31), and a heater (33) is provided on one side of the rotating plate (31) inside the isothermal heating cover (4).

7. The device according to claim 1, characterized in that The centering clamping device (3) comprises a plurality of fixing plates (34), one end of each of the fixing plates (34) being connected to the inner wall of the heating cylinder (2), the other end of each of the fixing plates (34) being fixed together and connected to the electric push rod (57), the connecting line of the plurality of fixing plates (34) at the far end being a regular polygon, a sliding hole (35) being provided on each of the fixing plates (34), sliding columns (36) being provided at both ends of the sliding hole (35), a sliding block (37) being provided on the outer sliding sleeve of the sliding column (36), one end of each of the sliding blocks (37) extending from the outer side of the sliding hole (35) to abut against the tubular ductile iron material (1), the other end of each of the sliding blocks (37) being hingedly provided with a traction rod (38), the other end of which being hingedly connected to the edge of the output end of the electric push rod (57).

8. The device according to claim 1, characterized in that The lower end of the heating cylinder (2) is connected to a bottom plate (39) via a supporting foot, and the edge positions of the upper end of the bottom plate (39) are respectively connected to hydraulic push rods (54) via columns, and the output ends of the hydraulic push rods (54) are connected to a lifting frame (40), and both inner walls of the lifting frame (40) are provided with a slide groove (41), and the inner wall of the slide groove (41) is connected to a fixed plate (42), and the lower side of the fixed plate (42) is connected to a cover plate (43) for closing the upper end of the heating cylinder (2), and the fixed plate (42) is connected to the lower side of the fixed plate (42). A rack (44) capable of passing through one end of a lifting frame (40) is connected to one side of the lifting frame (40), a sliding hole (35) matched 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 an output end of the driving motor (47) passes through the rotating seat (46) and is connected to the gear (45).

9. The device according to claim 8, characterized in that A second drive motor (48) is connected to the upper side of the cover plate (43), and a bevel gear (1) is connected to the output end of the second drive motor (48). A rotating shaft (49) is rotatably provided on the cover plate (43) via a bearing, and a second bevel gear (49) is connected to one end of the rotating shaft (49) and meshed with the first bevel gear. A circular ring (51) is connected to the other end of the rotating shaft (49) via a plurality of first support rods (50). The outer side of the circular ring (51) is respectively connected to the frame (5) via a plurality of second support rods (52), and the second support rods (52) are provided with fan blades (56).

10. A method for using an isothermal quenching ductile iron heat treatment equipment, applicable to an isothermal quenching ductile iron heat treatment equipment as claimed in any one of claims 1 to 9, characterized in that: include: A tubular ductile iron material (1) to be heat treated is placed on a central clamping device (3); The tubular ductile iron material (1) is moved centrally by a central clamping device (3); The isothermal heating hoods (4) are evenly distributed on the inner and outer sides of the tubular ductile iron material (1) and rotate around 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 degree.

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