Nodular cast iron water grate casting mold with cooling system and casting method

Abstract

The invention provides a nodular cast iron water grate casting mold with a cooling system and a casting method, and relates to the technical field of mold casting machining. The nodular cast iron water grate casting mold with the cooling system comprises a base, a guide frame is fixed to the base, a top base is fixed to the guide frame, a hydraulic cylinder is fixed to the top base, a hydraulic rod is fixed to the hydraulic cylinder, an upper mold base is fixed to the hydraulic rod, an upper ring is fixed to the outer portion of the upper mold base, and an upper ejector rod is fixed to the upper mold base. A lower die holder is fixed on the base, a lower ring is fixed outside the lower die holder, a lower ejector rod is fixed on the lower die holder, a liquid cooling structure is arranged on the top holder, an outer support is fixed outside the base, sealing structures are arranged on the upper die holder and the lower die holder, and an air cooling structure is arranged on the outer support. According to the nodular cast iron water grate casting mold with the cooling system and the casting method, the upper mold base and the lower mold base can be sealed through the sealing structure, the mold can be cooled through the liquid cooling structure, a casting can be cooled through the air cooling structure, and the casting cooling effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of die casting and processing, and specifically relates to a ductile iron water grate casting die with a cooling system and a casting method. Background Technique

[0002] The ductile iron water grate, also known as ductile iron rain grate, ductile iron gutter cover plate, etc., is a drainage facility made of ductile iron, mainly used for rainwater inlets, rainwater wells, inspection wells, and can also prevent foreign objects from falling into the wellhead;

[0003] The water grate is mainly formed by casting, that is, pouring high-temperature molten iron into a mold, and it can be formed after cooling. When the existing water grate casting equipment cools the mold, most of them cool down the mold from the outside by liquid cooling or air cooling. However, such a cooling method is inconvenient for cooling the mold and the water grate formed part from the inside, resulting in an unsatisfactory cooling effect of the mold, thereby reducing the efficiency of ductile iron water grate casting and processing. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a ductile iron water grate casting die with a cooling system and a casting method, which solves the problem of inconvenient rapid cooling and temperature reduction treatment of the mold and the water grate from the inside during the casting and processing of the water grate.

[0006] (II) Technical Solutions

[0007] To achieve the above purpose of facilitating rapid cooling and temperature reduction treatment of the mold and the water grate from the inside during the casting and processing of the water grate, the present invention is realized through the following technical solutions: A ductile iron water grate casting die with a cooling system includes a base, a guide frame is fixed on the base, a top seat is fixed at the top of the guide frame, a hydraulic cylinder is fixed on the top seat, a hydraulic rod is fixed on the hydraulic cylinder, a lower end of the hydraulic rod is fixed with an upper mold base, an upper ring is fixed outside the upper mold base, an upper ejector rod is fixed on the upper mold base, a lower mold base is fixed on the base through a bracket, a lower ring is fixed outside the lower mold base, a lower ejector rod is fixed on the lower mold base, a liquid cooling structure is arranged on the top seat, an outer bracket is fixed outside the base, a sealing structure is arranged on the upper mold base and the lower mold base, and an air cooling structure is arranged on the outer bracket.

[0008] Preferably, the liquid cooling structure includes a first cooling pump and a second cooling pump. The first cooling pump and the second cooling pump are respectively fixed on the base and the top seat, and are connected by a pipeline between the first cooling pump and the second cooling pump. Telescopic liquid guide pipes are fixed on both the first cooling pump and the second cooling pump. A upper docking head is fixed at the bottom end of the upper die base, and a lower docking head is fixed at the upper end of the lower die base. The upper docking head and the lower docking head are movably inserted. Cooling cavities are opened inside both the upper die base and the lower die base.

[0009] Preferably, the cooling cavity is in a snake shape, and the telescopic liquid guide pipes on both sides are respectively connected to both ends of the cooling cavity.

[0010] Preferably, the sealing structure includes a transverse electric rod. The transverse electric rod is fixed on both sides of the outer support. A sealing plate is fixed at the inner end of the transverse electric rod. Magnetic adsorption panels are arranged at both ends of the sealing plate. An upper combination groove is opened below the upper die base, and a lower combination groove is opened above the lower die base.

[0011] Preferably, adjacent two sealing plates are magnetically adsorbed and fixed through the magnetic adsorption panels, and a groove adapted to the sealing plate is formed between the upper combination groove and the lower combination groove.

[0012] Preferably, the air cooling structure includes a cooling fan. The cooling fan is fixed in the middle of the outer support. A telescopic air guide pipe is fixed on the cooling fan. An air outlet valve is fixed at the inner end of the telescopic air guide pipe, and the air outlet valve is fixedly connected to the sealing plate. Rectangular air outlets are opened on the surface of the sealing plate, and the air outlet valve extends into the interior of the rectangular air outlets. Exhaust pipes are fixed in the middle of both the upper die base and the lower die base. A sealing column is arranged inside the exhaust pipe. External threads are opened on one side of the inner wall of the exhaust pipe, internal threads are opened on one side of the outer surface of the sealing column, external air outlets are opened on the other side of the inner wall of the exhaust pipe, and internal air outlets are opened on the other side of the outer surface of the sealing column. A temperature sensor is fixed on the exhaust pipe, a turntable is fixed on the sealing column, and an annular groove is opened on one side of the turntable close to the temperature sensor.

[0013] Preferably, both ends of the rectangular air outlet are forty-five-degree inclined surfaces, and the four rectangular air outlets are communicated with each other in pairs.

[0014] Preferably, the rectangular air outlet is located at the connection of the upper die base and the lower die base, and the four rectangular air outlets are in a rectangular frame shape.

[0015] Preferably, the sealing column is threadedly connected to the exhaust pipe through the external threads and the internal threads, and the external air outlet is communicated with the internal air outlet.

[0016] A using method of a ductile iron grating casting mold with a cooling system includes the following steps:

[0017] First step, through the gating system set outside the upper die base and the lower die base, molten iron can be poured into the interiors of the upper die base and the lower die base. After the upper die base and the lower die base are closed and the molten iron is poured, the first cooling pump and the second cooling pump are started simultaneously. Through the first cooling pump, the second cooling pump and the telescopic liquid guide pipe on one side of the upper die base, the coolant can circulate inside the cooling cavity on one side of the upper die base, so that the upper die base can be cooled and temperature-reduced from the inside. Through the first cooling pump, the second cooling pump and the telescopic liquid guide pipe on one side of the lower die base, the coolant can circulate inside the cooling cavity on one side of the lower die base, so that the lower die base can be cooled and temperature-reduced from the inside. Therefore, the water grate casting in the die cavities of the upper die base and the lower die base can also be cooled and temperature-reduced.

[0018] Second step, a water grate casting can be formed in the inner cavities of the upper die base and the lower die base. After the water grate casting is formed, the hydraulic rod first drives the upper die base to move upward by a certain distance. The casting is first ejected from the upper die base for demolding by the upper ejector rod, and then the casting is ejected from the lower die base by the lower ejector rod, so that gaps are generated between both the upper die base and the lower die base and the casting. Then the upper die base moves downward, so that the upper die base and the lower die base are closed again.

[0019] Third step, the transverse electric rod can drive the sealing plate to fit inside the upper joint groove and the lower joint groove, so that the four sealing plates can fit on the four side surfaces of the upper die base and the lower die base, and the adjacent sealing plates can be fixedly connected by the magnetic attraction panel. Therefore, the connection part of the upper die base and the lower die base can be sealed.

[0020] Fourth step, when the sealing plate fits on the side surfaces of the upper die base and the lower die base, at this time the rectangular air outlets are aligned with the gap between the upper die base and the lower die base, so that the four rectangular air outlets can be aligned with the gap from four sides. Then the cooling fan is started, and cold air can be delivered into the rectangular air outlets through the telescopic air duct and the air outlet valve. Therefore, the four rectangular air outlets can blow cold air into the die cavities of the upper die base and the lower die base from four sides, and cool and temperature-reduce the casting in the die cavity. The sealing column is opened outward, and the cold air can take away and discharge the hot air inside the die cavity through the outer air outlet and the inner air outlet, and the temperature of the discharged air can be monitored by the temperature sensor. When the temperature of the discharged gas reaches the cooling temperature requirement, it means that the cooling and temperature-reduction treatment of the casting and the mold is completed, and then the upper die base and the lower die base can be opened, and the casting can be taken out.

[0021] (III) Beneficial effects

[0022] The present invention provides a ductile iron water grate casting mold with a cooling system and a casting method. It has the following beneficial effects:

[0023] 1. The first cooling pump and the second cooling pump can enable the coolant to circulate inside the serpentine cooling cavity through the telescopic liquid guide pipes on both sides. The serpentine cooling cavity can increase the flow path of the coolant inside it and the contact area between the coolant and the cooling cavity, so as to cool the upper die holder and the lower die holder respectively from the inside, and can also cool the casting inside the mold cavity.

[0024] 2. When the upper ejector rod extends, the casting can be ejected from the upper die holder, enabling the upper die holder to be demolded. When the lower ejector rod extends further, the casting can be ejected from the lower die holder, and then the upper die holder and the lower die holder are closed. A certain gap can be generated between the inner wall of the mold cavity jointly formed by the casting, the upper die holder and the lower die holder. The connection between the upper die holder and the lower die holder can be sealed by four sealing plates, and the rectangular air outlet can be aligned with the gap at the connection between the upper die holder and the lower die holder, so as to cool the mold cavity from the inside subsequently.

[0025] 3. The cooling fan can blow cold air into the rectangular air outlet through the telescopic air duct and the air outlet valve. The rectangular air outlet can blow cold air into the gap between the inner wall of the mold cavity and the casting from the periphery of the upper die holder and the lower die holder, enabling the cold air to flow in the gap between the inner wall of the mold cavity and the casting. The cold air in the gap between the inner wall of the mold cavity and the casting can be discharged from the outer air outlet and the inner air outlet. Therefore, the cold air can take away the heat on the inner wall of the mold cavity and the surface of the casting, achieving the purpose of cooling the inner wall of the mold cavity and the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the upper die holder and the lower die holder of the present invention being closed;

[0028] Figure 3 It is a schematic diagram of the sealing plate of the present invention;

[0029] Figure 4 It is a schematic diagram of the upper die holder of the present invention;

[0030] Figure 5 It is a schematic diagram of the lower die holder of the present invention;

[0031] Figure 6 It is a schematic diagram of the exhaust pipe and the sealing column of the present invention being opened;

[0032] Figure 7 It is a schematic diagram of the structure of the cooling cavity of the present invention.

[0033] Among them, 1. Base; 2. Guide frame; 3. Top seat; 31. Hydraulic cylinder; 32. Hydraulic rod; 4. Upper die holder; 41. Upper ring; 42. Upper ejector rod; 5. Lower die holder; 51. Lower ring; 52. Lower ejector rod; 6. Liquid cooling structure; 61. First cooling pump; 62. Second cooling pump; 63. Telescopic liquid guide pipe; 64. Upper docking head; 65. Lower docking head; 66. Cooling cavity; 7. Outer bracket; 8. Sealing structure; 81. Transverse electric rod; 82. Sealing plate; 83. Magnetic adsorption panel; 84. Upper joint groove; 85. Lower joint groove; 9. Air cooling structure; 91. Cooling fan; 92. Telescopic air duct; 93. Air outlet valve; 94. Rectangular air outlet; 95. Exhaust pipe; 96. Sealing column; 97. External thread; 98. Internal thread; 99. External air outlet; 910. Internal air outlet; 911. Temperature sensor; 912. Turntable; 913. Annular groove. Specific embodiments

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It 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, so it cannot be understood as a limitation to the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Please refer to Figures 1 - 7, the present invention provides a technical solution: a ductile iron manhole cover casting mold with a cooling system, including a base 1, a guide frame 2 is fixed on the base 1, a top seat 3 is fixed at the top of the guide frame 2, a hydraulic cylinder 31 is fixed on the top seat 3, a hydraulic rod 32 is fixed on the hydraulic cylinder 31, the bottom end of the hydraulic rod 32 is fixed with an upper mold base 4, an upper ring 41 is fixed outside the upper mold base 4, an upper ejector rod 42 is fixed on the upper mold base 4, a lower mold base 5 is fixed on the base 1 through a bracket, a lower ring 51 is fixed outside the lower mold base 5, and the upper ring 41 is slidably connected with the guide frame 2, the lower ring 51 is fixedly connected with the guide frame 2, a lower ejector rod 52 is fixed on the lower mold base 5, a liquid cooling structure 6 is arranged on the top seat 3, an outer bracket 7 is fixed outside the base 1, a sealing structure 8 is arranged on the upper mold base 4 and the lower mold base 5, an air cooling structure 9 is arranged on the outer bracket 7, the upper mold base 4 can be driven to move down by the hydraulic rod 32, and the upper mold base 4 can be guided by the guide frame 2, so that the upper mold base 4 and the lower mold base 5 are closed. At this time, the upper docking head 64 is inserted into the lower docking head 65, and the upper mold base 4 and the lower mold base 5 can be horizontally limited from the inside through the upper docking head 64 and the lower docking head 65. Then, molten iron can be poured into the mold cavity jointly formed by the upper mold base 4 and the lower mold base 5 through the pouring ports reserved outside the upper mold base 4 and the lower mold base 5. After the casting cools and forms a manhole cover, the manhole cover can be cast and processed.

[0036] In this embodiment, the liquid cooling structure 6 includes a first cooling pump 61 and a second cooling pump 62. The first cooling pump 61 and the second cooling pump 62 are respectively fixed on the base 1 and the top seat 3, and the first cooling pump 61 and the second cooling pump 62 are connected by a pipeline. Telescopic liquid guide pipes 63 are fixed on both the first cooling pump 61 and the second cooling pump 62. An upper docking head 64 is fixed at the bottom end of the upper mold base 4, a lower docking head 65 is fixed at the upper end of the lower mold base 5, the upper docking head 64 is movably inserted into the lower docking head 65, and cooling cavities 66 are formed inside both the upper mold base 4 and the lower mold base 5;

[0037] Specifically, as shown in the attached drawings of the specification Figure 1 and the attached drawings of the specification Figure 7 As shown, the first cooling pump 61 first conveys the cooling liquid to one end of the cooling cavity 66 through the telescopic liquid guide pipe 63 on one side. After the cooling liquid flows to the other end inside the cooling cavity 66, it enters the second cooling pump 62 through the telescopic liquid guide pipe 63 on the other side. And the first cooling pump 61 and the second cooling pump 6II are connected by a pipeline. As shown in the attached drawings of the specification Figure 1 As shown, the pipeline is hidden on the bottom surface of the top seat 3. Therefore, the cooling liquid can circulate, so as to continuously perform liquid cooling and temperature reduction treatment on the upper mold base 4 and the lower mold base 5.

[0038] In this embodiment, the cooling cavity 66 is in a snake shape, and the telescopic liquid guide pipes 63 on both sides are respectively communicated with both ends of the cooling cavity 66;

[0039] Specifically, as shown in the attached drawings of the specification Figure 7 As shown, the cooling cavity 66 is composed of a wire cavity in the upper part and U-shaped cavities on both sides, and the wire cavity and the U-shaped cavities on both sides are connected end to end to form a curved serpentine channel. Moreover, the cooling cavity 66 is respectively arranged inside the upper die base 4 and the lower die base 5 so as to be able to cool and lower the temperature of the upper die base 4 and the lower die base 5 from the inside.

[0040] In this embodiment, the sealing structure 8 includes a transverse electric rod 81. The transverse electric rod 81 is fixed on both sides of the outer bracket 7. A sealing plate 82 is fixed at the inner end of the transverse electric rod 81. Magnetic attraction panels 83 are arranged at both ends of the sealing plate 82. An upper joint groove 84 is opened below the upper die base 4, and a lower joint groove 85 is opened above the lower die base 5;

[0041] Specifically, as shown in the attached drawings of the specification Figure 1 and the attached drawings of the specification Figure 2 As shown, the transverse electric rod 81 can drive the sealing plate 82 to move inward simultaneously, so that the four sealing plates 82 can form a rectangular sealing frame outside the upper die base 4 and the lower die base 5, enabling the sealing frame to seal the connection part of the upper die base 4 and the lower die base 5 from all around.

[0042] In this embodiment, the adjacent two sealing plates 82 are magnetically attracted and fixed through the magnetic attraction panels 83, and a groove adapted to the sealing plate 82 is formed between the upper joint groove 84 and the lower joint groove 85;

[0043] Specifically, as shown in the attached drawings of the specification Figure 3 As shown, the two ends of the two sealing plates 82 are at a 45-degree bevel. When the adjacent two sealing plates 82 are in contact with each other, they can be magnetically attracted and fixed through the magnetic attraction panels 83. At the same time, the four rectangular air outlets 94 are also connected and aligned with the gap at the connection part of the upper die base 4 and the lower die base 5.

[0044] In this embodiment, the air-cooling structure 9 includes a cooling fan 91. The cooling fan 91 is fixed in the middle of the outer bracket 7. A telescopic air duct 92 is fixed on the cooling fan 91. An air outlet valve 93 is fixed at the inner end of the telescopic air duct 92. Moreover, the air outlet valve 93 is fixedly connected with the sealing plate 82. Rectangular air outlets 94 are opened on the surface of the sealing plate 82. The air outlet valve 93 extends into the interior of the rectangular air outlets 94. Exhaust pipes 95 are respectively fixed in the middle of the upper die base 4 and the lower die base 5. A sealing column 96 is arranged inside the exhaust pipes 95. External threads 97 are opened on one side of the inner wall of the exhaust pipes 95. Internal threads 98 are opened on one side of the outer surface of the sealing column 96. External air outlets 99 are opened on the other side of the inner wall of the exhaust pipes 95. Internal air outlets 910 are opened on the other side of the outer surface of the sealing column 96. A temperature sensor 911 is fixed on the exhaust pipes 95. A turntable 912 is fixed on the sealing column 96. An annular groove 913 is opened on one side of the turntable 912 close to the temperature sensor 911;

[0045] Specifically, as shown in the attached drawings of the specification Figure 4 , the attached drawings of the specification Figure 5 and the attached drawings of the specification Figure 6 As shown, at the initial position, the sealing column 96 is flush with the exhaust pipe 95, that is, the inner ends of the exhaust pipe 95 and the sealing column 96 are adapted to the mold cavity formed between the upper mold base 4 and the lower mold base 5, and the temperature sensor 911 is located inside the annular groove 913. The temperature sensor 911 is a thermistor sensor, composed of metal oxide ceramics, which is a low-cost and high-sensitivity temperature sensor and is widely used in various fields. The sealing column 96 can be driven to move outward by the turntable 912, and the outer air outlet 99 and the inner air outlet 910 are connected. Therefore, the heat carried by the cold air blown into the mold cavity can be discharged through the outer air outlet 99 and the inner air outlet 910, achieving the effect of cooling the mold cavity and the casting.

[0046] In this embodiment, both ends of the rectangular air outlet 94 are forty-five-degree inclined surfaces, and the four rectangular air outlets 94 are pairwise interconnected;

[0047] Specifically, as shown in the attached drawings of the specification Figure 3 As shown, both ends of the rectangular air outlet 94 are forty-five-degree inclined surfaces, so that after the adjacent two sealing plates 82 come into contact, the adjacent two rectangular air outlets 94 can also be connected.

[0048] In this embodiment, the rectangular air outlet 94 is located at the connection between the upper mold base 4 and the lower mold base 5, and the four rectangular air outlets 94 are in a rectangular frame shape;

[0049] Specifically, as shown in the attached drawings of the specification Figure 2 As shown, when the four sealing plates 82 come into contact with each other, the four rectangular air outlets 94 are also connected, and the four rectangular air outlets 94 are aligned with the connection between the upper mold base 4 and the lower mold base 5, so that cooling can be simultaneously delivered into the mold cavity through the rectangular air outlets 94 for cooling.

[0050] In this embodiment, the sealing column 96 is threadedly connected to the exhaust pipe 95 through the external thread 97 and the internal thread 98, and the outer air outlet 99 is connected to the inner air outlet 910;

[0051] Specifically, it is convenient for the sealing column 96 to axially move inside the exhaust pipe 95 through the external thread 97 and the internal thread 98. When the sealing column 96 is rotated inward, the sealing column 96 can be fixed on the exhaust pipe 95, thereby blocking the exhaust pipe 95, so that the mold cavity can be sealed, and it is convenient for pouring molten iron not to leak.

[0052] A method for using a ductile iron manhole cover casting mold with a cooling system includes the following steps:

[0053] First step, through the gating system set outside the upper die base 4 and the lower die base 5, molten iron can be poured into the interiors of the upper die base 4 and the lower die base 5. After the upper die base 4 and the lower die base 5 are closed and the molten iron is poured, the first cooling pump 61 and the second cooling pump 62 are started simultaneously. Through the first cooling pump 61, the second cooling pump 62, and the telescopic liquid guide pipe 63 on one side of the upper die base 4, the coolant can circulate inside the cooling cavity 66 on one side of the upper die base 4, so that the upper die base 4 can be cooled down from the inside. Through the first cooling pump 61, the second cooling pump 62, and the telescopic liquid guide pipe 63 on one side of the lower die base 5, the coolant can circulate inside the cooling cavity 66 on one side of the lower die base 5, so that the lower die base 5 can be cooled down from the inside. Therefore, the water grate casting in the cavities of the upper die base 4 and the lower die base 5 can also be cooled down.

[0054] Second step, a water grate casting can be formed in the inner cavities of the upper die base 4 and the lower die base 5. After the water grate casting is formed, first, the hydraulic rod 32 drives the upper die base 4 to move upward by a certain distance. The casting is first ejected from the upper die base 4 by the upper ejector rod 42 for demolding. Then, the casting is ejected from the lower die base 5 by the lower ejector rod 52, so that gaps are generated between both the upper die base 4 and the lower die base 5 and the casting. Then, the upper die base 4 is moved downward so that the upper die base 4 and the lower die base 5 are closed again.

[0055] Third step, the transverse electric rod 81 can drive the sealing plate 82 to fit inside the upper joint groove 84 and the lower joint groove 85, so that the four sealing plates 82 can fit on the four side surfaces of the upper die base 4 and the lower die base 5. And through the magnetic attraction panel 83, the adjacent sealing plates 82 can be fixedly connected. Therefore, the connection part of the upper die base 4 and the lower die base 5 can be sealed.

[0056] Fourth step, when the sealing plate 82 fits on the side surfaces of the upper die base 4 and the lower die base 5, at this time, the rectangular air outlets 94 are aligned with the gap between the upper die base 4 and the lower die base 5, so that the four rectangular air outlets 94 can be aligned with the gap from four sides. Then, the cooling fan 91 is started, and cold air can be delivered to the rectangular air outlets 94 through the telescopic air duct 92 and the air outlet valve 93. Therefore, the four rectangular air outlets 94 can blow cold air into the cavities of the upper die base 4 and the lower die base 5 from four sides and cool down the casting in the cavity. The sealing column 96 is opened outward, and the cold air can take away and discharge the hot air inside the cavity through the outer air outlet 99 and the inner air outlet 910. And the temperature sensor 911 can monitor the temperature of the discharged air. When the temperature of the discharged gas reaches the cooling temperature requirement, it means that the cooling and temperature reduction treatment of the casting and the mold is completed. Then, the upper die base 4 and the lower die base 5 can be opened, and the casting can be taken out.

[0057] Working principle and usage process of the present invention: Molten iron can be poured into the mold cavity jointly formed by the upper mold base 4 and the lower mold base 5 through the pouring ports reserved outside the upper mold base 4 and the lower mold base 5. At the same time, the first cooling pump 61 and the second cooling pump 62 provided on the upper mold base 4 and the lower mold base 5 are respectively started, and the first cooling pump 61 and the second cooling pump 62 can enable the coolant to circulate inside the serpentine cooling cavity 66 through the telescopic liquid guide pipes 63 on both sides. Therefore, through the serpentine cooling cavity 66, the travel of the coolant flowing inside it can be increased, and the contact area between the coolant and the cooling cavity 66 can be increased, so that the upper mold base 4 and the lower mold base 5 can be cooled and temperature-reduced respectively from the inside, and at the same time, the castings inside the mold cavity can also be cooled and temperature-reduced. After the castings are cooled and formed into water grates, the hydraulic rod 32 contracts and drives the upper mold base 4 to move upward a certain distance first. During this process, the upper ejector rod 42 extends and can eject the castings out of the upper mold base 4, enabling the upper mold base 4 to be demolded. Then the upper ejector rod 42 resets. At the same time, the lower ejector rod 52 extends again and can eject the castings out of the lower mold base 5, and then the lower ejector rod 52 resets. Then the upper mold base 4 moves downward again to close the mold with the lower mold base 5, so that the surface of the castings is no longer adhered to the inner wall of the mold cavity, so that a certain gap can be generated between the castings and the inner wall of the mold cavity jointly formed by the upper mold base 4 and the lower mold base 5. Starting the transverse electric rod 81 can make the four sealing plates 82 move inward and stick to the groove formed by the upper joint groove 84 and the lower joint groove 85. At this time, two adjacent sealing plates 82 are in contact with each other in pairs and are fixed by attracting each other through the magnetic attraction panel 83. Therefore, the connection part of the upper mold base 4 and the lower mold base 5 can be sealed, and the rectangular air outlet 94 can be aligned with the gap at the connection part of the upper mold base 4 and the lower mold base 5. Then the cooling fan 91 can blow cold air into the rectangular air outlet 94 through the telescopic air duct 92 and the air outlet valve 93. Therefore, the rectangular air outlet 94 can blow cold air from the periphery of the upper mold base 4 and the lower mold base 5 into the gap between the inner wall of the mold cavity and the castings, so that the cold air flows in the gap between the inner wall of the mold cavity and the castings. At the same time, by rotating the turntable 912 outward, the sealing column 96 can be moved outward, and at the same time, one side of the inner air outlet 910 moves to the outside of the exhaust pipe 95, and the outer air outlet 99 is aligned with and communicated with the inner air outlet 910. Therefore, the cold air in the gap between the inner wall of the mold cavity and the castings can be discharged from the outer air outlet 99 and the inner air outlet 910. Therefore, the cold air can take away the heat on the inner wall of the mold cavity and the surface of the castings, achieving the purpose of cooling and temperature-reducing the inner wall of the mold cavity and the castings, and the temperature sensor 911 can monitor the temperature of the gas discharged from the inner air outlet 910. When the temperature of the discharged gas reaches the cooling temperature requirement, it means that the cooling and temperature-reducing treatment of the castings and the mold is completed, and the upper mold base 4 and the lower mold base 5 can be opened, and the castings can be taken out.

[0058] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ductile iron gully cover casting mold with a cooling system, comprising a base (1), characterized in that: A guide frame (2) is fixed on the base (1). A top seat (3) is fixed at the top end of the guide frame (2). A hydraulic cylinder (31) is fixed on the top seat (3). A hydraulic rod (32) is fixed on the hydraulic cylinder (31). The bottom end of the hydraulic rod (32) is fixed with an upper die holder (4). An upper ring (41) is fixed outside the upper die holder (4). An upper ejector rod (42) is fixed on the upper die holder (4). A lower die holder (5) is fixed on the base (1) through a bracket. A lower ring (51) is fixed outside the lower die holder (5). And the upper ring (41) is slidably connected with the guide frame (2), and the lower ring (51) is fixedly connected with the guide frame (2). A lower ejector rod (52) is fixed on the lower die holder (5). A liquid cooling structure (6) is arranged on the top seat (3). An outer bracket (7) is fixed outside the base (1). A sealing structure (8) is arranged on the upper die holder (4) and the lower die holder (5). An air cooling structure (9) is arranged on the outer bracket (7).

2. The ductile iron gully grate casting mold with a cooling system according to claim 1, characterized in that: The liquid cooling structure (6) includes a first cooling pump (61) and a second cooling pump (62). The first cooling pump (61) and the second cooling pump (62) are respectively fixed on the base (1) and the top seat (3). And the first cooling pump (61) and the second cooling pump (62) are connected and communicated through a pipeline. Telescopic liquid guide pipes (63) are fixed on both the first cooling pump (61) and the second cooling pump (62). An upper docking head (64) is fixed at the bottom end of the upper die holder (4). A lower docking head (65) is fixed at the upper end of the lower die holder (5). The upper docking head (64) is movably inserted into the lower docking head (65). Cooling cavities (66) are respectively opened inside the upper die holder (4) and the lower die holder (5).

3. A ductile iron gully cover casting mold with a cooling system according to claim 2, characterized in that: The cooling cavity (66) is in a snake shape. The two telescopic liquid guide pipes (63) on both sides are respectively connected and communicated with the two ends of the cooling cavity (66).

4. A ductile iron gully cover casting mold with a cooling system according to claim 2, characterized in that: The sealing structure (8) includes a transverse electric rod (81). The transverse electric rod (81) is fixed on both sides of the outer bracket (7). A sealing plate (82) is fixed at the inner end of the transverse electric rod (81). Magnetic attraction panels (83) are arranged at both ends of the sealing plate (82). An upper combination groove (84) is opened below the upper die holder (4). A lower combination groove (85) is opened above the lower die holder (5).

5. A ductile iron gully cover casting mold with a cooling system according to claim 4, characterized in that: The adjacent two sealing plates (82) are magnetically attracted and fixed through the magnetic attraction panels (83). A groove adapted to the sealing plate (82) is formed between the upper combination groove (84) and the lower combination groove (85).

6. The ductile iron gully grate casting mold with a cooling system according to claim 4, characterized in that: The air-cooling structure (9) includes a cooling fan (91). The cooling fan (91) is fixed in the middle of the outer bracket (7). A telescopic air duct (92) is fixed on the cooling fan (91). The inner end of the telescopic air duct (92) is fixed with an air outlet valve (93), and the air outlet valve (93) is fixedly connected to the sealing plate (82). A rectangular air outlet (94) is formed on the surface of the sealing plate (82), and the air outlet valve (93) extends into the interior of the rectangular air outlet (94). Exhaust pipes (95) are fixed in the middle of the upper mold base (4) and the lower mold base (5). A sealing column (96) is arranged inside the exhaust pipe (95). External threads (97) are formed on one side of the inner wall of the exhaust pipe (95). Internal threads (98) are formed on one side of the outer surface of the sealing column (96). An external air outlet (99) is formed on the other side of the inner wall of the exhaust pipe (95). An internal air outlet (910) is formed on the other side of the outer surface of the sealing column (96). A temperature sensor (911) is fixed on the exhaust pipe (95). A turntable (912) is fixed on the sealing column (96). An annular groove (913) is formed on one side of the turntable (912) close to the temperature sensor (911).

7. A ductile iron gully cover casting mold with a cooling system according to claim 6, characterized in that: Both ends of the rectangular air outlet (94) are 45-degree inclined planes, and the four rectangular air outlets (94) are connected to each other in pairs.

8. A ductile iron gully cover casting mold with a cooling system according to claim 6, characterized in that: The rectangular air outlet (94) is located at the connection between the upper mold base (4) and the lower mold base (5), and the four rectangular air outlets (94) are in a rectangular frame shape.

9. A ductile iron gully cover casting mold with a cooling system according to claim 6, characterized in that: The sealing column (96) is threadedly connected to the exhaust pipe (95) through the external threads (97) and the internal threads (98), and the external air outlet (99) is communicated with the internal air outlet (910).

10. A method for using a ductile iron gully cover casting mold with a cooling system, according to any one of claims 1-9, a ductile iron gully cover casting mold with a cooling system, characterized in that: It includes the following steps: In the first step, through the casting ports arranged outside the upper mold base (4) and the lower mold base (5), molten iron can be poured into the interiors of the upper mold base (4) and the lower mold base (5). After the upper mold base (4) and the lower mold base (5) are closed and the molten iron is poured, the first cooling pump (61) and the second cooling pump (62) are started simultaneously. Through the first cooling pump (61), the second cooling pump (62) and the telescopic liquid guide pipe (63) on one side of the upper mold base (4), the coolant can circulate inside the cooling cavity (66) on one side of the upper mold base (4), so as to cool and lower the temperature of the upper mold base (4) from the inside. Through the first cooling pump (61), the second cooling pump (62) and the telescopic liquid guide pipe (63) on one side of the lower mold base (5), the coolant can circulate inside the cooling cavity (66) on one side of the lower mold base (5), so as to cool and lower the temperature of the lower mold base (5) from the inside. Therefore, the water grate castings in the mold cavities of the upper mold base (4) and the lower mold base (5) can also be cooled and their temperatures can be lowered. In the second step, a water grate casting can be formed in the inner cavities of the upper die base (4) and the lower die base (5). After the water grate casting is formed, first, the hydraulic rod (32) drives the upper die base (4) to move upward by a certain distance. The casting is first ejected from the upper die base (4) for demolding by the upper ejector rod (42), and then the casting is ejected from the lower die base (5) by the lower ejector rod (52), so that gaps are generated between both the upper die base (4) and the lower die base (5) and the casting. Then, the upper die base (4) is moved downward so that the upper die base (4) and the lower die base (5) are closed again; In the third step, the transverse electric rod (81) can drive the sealing plate (82) to be attached to the inside of the upper joint groove (84) and the lower joint groove (85), so that the four sealing plates (82) can be attached to the four side surfaces of the upper die base (4) and the lower die base (5), and the adjacent sealing plates (82) can be fixedly connected by the magnetic attraction panel (83). Therefore, the connection between the upper die base (4) and the lower die base (5) can be sealed; In the fourth step, when the sealing plate (82) is attached to the side surfaces of the upper die base (4) and the lower die base (5), at this time, the rectangular air outlets (94) are aligned with the gap between the upper die base (4) and the lower die base (5), so that the four rectangular air outlets (94) can be aligned with the gap from four sides. Then, the cooling fan (91) is started, and cold air can be conveyed into the rectangular air outlets (94) through the telescopic air duct (92) and the air outlet valve (93). Therefore, the four rectangular air outlets (94) can blow cold air into the die cavities of the upper die base (4) and the lower die base (5) from four sides, and cool down the casting in the die cavities. The sealing column (96) is opened outward, and the cold air can take away and discharge the hot air inside the die cavity through the outer air outlet (99) and the inner air outlet (910), and the temperature of the discharged air can be monitored by the temperature sensor (911). When the temperature of the discharged gas reaches the cooling temperature requirement, it means that the cooling and temperature reduction treatment of the casting and the mold is completed. Then, the upper die base (4) and the lower die base (5) can be opened, and the casting can be taken out.

Images