A preheating device and method for riser pipes

Abstract

A riser pipe preheating device includes a heating furnace with an opening at the top. A support assembly is provided at the opening of the heating furnace. The support assembly includes a support ring mounted on the upper surface of the heating furnace. Multiple adjusting mechanisms are arranged in a circumferential array on the support ring. One end of each adjusting mechanism extends to the outside of the support ring, and the other end extends together to the opening of the inner ring of the support ring. Each adjusting mechanism can adjust its relative position at its end at the opening of the inner ring of the support ring. This riser pipe preheating device improves the fluidity of molten metal and is applicable to heating furnaces of different diameters and riser pipes of different sizes for preheating. It is also easy to fix and limit the position. This invention also provides a riser pipe preheating method, which facilitates real-time control of the riser pipe preheating temperature to achieve the purpose of protection.

Description

Technical Field

[0001] This invention relates to the field of casting equipment technology, and in particular to a preheating device and method for a riser pipe. Background Technology

[0002] Pressure casting is a casting method in which liquid or semi-solid metal or alloy, or liquid metal or alloy containing reinforcing phases, is filled into the cavity of a die-casting mold at high pressure and high speed, and then solidifies under pressure to form a casting. The principle of pressure casting is mainly the injection forming principle of molten metal. The casting conditions are usually set by adjusting the speed, pressure, and speed switching positions on the die-casting machine.

[0003] In existing pressure casting equipment, metal is typically melted in a crucible, then compressed air is introduced to force the molten metal through a riser pipe into a mold, where it cools and solidifies to form the casting. However, if the riser pipe is not preheated, the molten metal can easily cool down as it passes through, affecting its fluidity and casting quality. Furthermore, the rapid cooling of the molten metal within the riser pipe can cause solidification, leading to blockages that are difficult to remove once solidified. Summary of the Invention

[0004] The purpose of this invention is to provide a preheating device for the riser tube, which solves the problems in the background art, improves the fluidity of molten metal, and avoids blockage of the riser tube.

[0005] To achieve the above objectives, the following technical solution is adopted: a riser pipe preheating device, including a heating furnace with an opening at the upper end. A support assembly is provided at the opening at the upper end of the heating furnace. The support assembly includes a support ring, which is installed on the upper surface of the heating furnace. Multiple adjustment mechanisms are arranged in a circumferential array on the support ring. One end of each adjustment mechanism extends to the outside of the support ring, and the other end extends together to the opening of the inner ring of the support ring. The adjustment mechanism has the function of adjusting its relative position at the end of the inner ring opening of the support ring.

[0006] Preferably, the adjusting mechanism includes a screw, a guide rod, and a support block. The screw is arranged radially along the support ring and threadedly connected to the support ring. One end of the screw extends to the outside of the support ring and is connected to a rotating part. The other end of the screw extends to the opening of the inner ring of the support ring and is rotatably connected to the support block. The support ring is provided with a guide hole parallel to the screw. A guide rod is slidably connected to the guide hole. One end of the guide rod extends to the opening of the inner ring of the support ring and is fixedly connected to the support block.

[0007] Preferably, the system further includes a positioning mechanism arranged in an array along the circumferential direction of the support ring. The positioning mechanism includes a limiting groove disposed on the lower end face of the support ring. The limiting groove is arranged in the radial direction of the support ring. A limiting block is disposed in the limiting groove, and the limiting block is higher than the end face of the support ring by a predetermined distance. A positioning rod is disposed on the limiting groove. One end of the positioning rod is rotatably connected to the groove wall at the end of the limiting groove. The other end of the positioning rod passes through the support ring and extends to the outside, where an adjustment part is fixedly connected. The positioning rod located in the limiting groove is provided with an external thread, and the positioning rod is threadedly connected to the limiting block through the external thread.

[0008] Preferably, the heating furnace includes a furnace body, and a heating resistance wire is arranged in a ring inside the furnace body.

[0009] Preferably, an electrical control cabinet is provided outside the heating furnace, and the electrical control cabinet is used to control the heating temperature of the heating resistance wire.

[0010] Preferably, the heating furnace is equipped with two thermocouples, both of which are connected to the power distribution cabinet.

[0011] Preferably, asbestos is wound around the support block.

[0012] Preferably, the upper end of the support assembly is provided with a heat insulation cover, and the top of the heat insulation cover is provided with a hanging ring.

[0013] Preferably, the system further includes an auxiliary mechanism, which includes a limiting plate and an elastic support member. The limiting plate is located on one side of the support block and is positioned away from the guide rod. The limiting plate has two limiting holes. The side of the limiting plate away from the support block is connected to the elastic support member via a connecting column. The elastic support member has two sliding grooves. A top rod is fixed on the side of the support block adjacent to the limiting plate. The other ends of the two top rods extend through the two limiting holes to the two sliding grooves on the elastic support member. A spring is provided on the top rod between the support block and the limiting plate.

[0014] The present invention also improves a method for preheating a riser pipe, comprising the following steps: Place the bracket assembly on the upper surface of the heating furnace, and adjust the positioning mechanism to make the limiting block, which is a predetermined distance above the end face of the support ring, lock onto the inner wall of the heating furnace opening. The riser pipe is moved between multiple support blocks using hoisting equipment, and the lower end of the riser pipe extends into the heating furnace to a predetermined depth. By rotating the rotating part, multiple support blocks are brought closer together and the riser pipe is fixed, and the hoisting equipment is removed. One thermocouple is used to measure the temperature of the riser pipe, and the other thermocouple is used to measure the temperature inside the furnace chamber of the heating furnace. The preheating temperature of the two thermocouples is set through the distribution cabinet. The dual control mode is adopted so that when the temperature inside the furnace chamber or the temperature of the riser pipe reaches the corresponding preheating temperature, the heating of the heating furnace is disconnected through the distribution cabinet.

[0015] Preferably, the preset temperature of the thermocouple used to measure the riser tube is lower than the preset temperature of another thermocouple used to measure the furnace lining of the heating furnace.

[0016] The beneficial effects achieved by this invention are as follows: This invention provides a riser pipe preheating device that prevents molten metal from losing fluidity and casting quality due to cooling as it passes through the riser pipe. An adjustment mechanism better accommodates riser pipes of different sizes; a positioning mechanism adapts to furnaces of different diameters and facilitates the fixing and limiting of the support assembly; and an auxiliary mechanism ensures better fit with riser pipes of different sizes for improved stability. This invention also provides a riser pipe preheating method that allows for real-time temperature control, enabling reheating using residual heat in case of overheating protection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a riser pipe preheating device according to the present invention.

[0018] Figure 2 This is a schematic diagram of the connection structure between the riser pipe preheating device and the riser pipe according to the present invention.

[0019] Figure 3 This is a schematic diagram of the support assembly structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the internal structure of the support assembly of the present invention.

[0021] Figure 5 This is a bottom view of the support assembly of the present invention.

[0022] Figure 6 This is a schematic diagram of the auxiliary mechanism structure of the present invention.

[0023] Figure 7 for Figure 6 A magnified schematic diagram of the central part of the structure.

[0024] In the diagram, 1-Heating furnace, 2-Support ring, 3-Adjusting mechanism, 31-Screw, 32-Guide rod, 33-Support block, 34-Rotating part, 35-Guide through hole, 4-Positioning mechanism, 41-Limiting groove, 42-Limiting block, 43-Positioning rod, 44-Adjusting part, 5-Distribution cabinet, 6-Insulation cover, 7-Auxiliary mechanism, 71-Limiting plate, 72-Elastic support, 73-Limiting hole, 74-Connecting column, 75-Slide groove, 76-Top rod, 77-Spring, 8-Lifting pipe. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] See appendix Figure 1-7 A preheating device for a riser pipe includes a furnace 1, which includes a furnace body. A heating resistance wire is arranged in a ring inside the furnace body. The furnace 1 has an upper opening, and a support assembly is provided at the upper opening. The support assembly includes a support ring 2, which is mounted on the upper surface of the furnace 1. Multiple adjusting mechanisms 3 are arranged in a circumferential array on the support ring 2. One end of each adjusting mechanism 3 extends to the outside of the support ring 2, and the other end extends together to the inner ring opening of the support ring 2. Each adjusting mechanism 3 can adjust its relative position at the end of its position at the inner ring opening of the support ring 2. By preheating the riser pipe 8 through the furnace 1, the fluidity of the molten metal as it passes through the riser pipe is improved, preventing the riser pipe from freezing and causing blockage. This allows the molten metal to be better formed after reaching the mold cavity, thus improving the quality of the casting. Simultaneously, because the adjusting mechanism 3 can adjust its relative position at the end of its position at the inner ring opening of the support ring 2, it can better adapt to riser pipes of different sizes.

[0028] Specifically, to facilitate adjustment of the relative position of the adjusting mechanism 3 located at the inner ring opening of the support ring 2, the adjusting mechanism 3 includes a screw 31, a guide rod 32, and a support block 33. The screw 31 is arranged radially along the support ring 2 and threadedly connected to the support ring 2. One end of the screw 31 extends to the outside of the support ring 2 and is connected to a rotating part 34. The other end of the screw 31 extends to the inner ring opening of the support ring 2 and is rotatably connected to the support block 33. Asbestos is wrapped around the support block 33 to avoid scratching the coating on the outer surface of the riser tube 8. The support ring 2 is provided with a guide hole 35 parallel to the screw 31. The guide rod 32 is slidably connected to the guide hole 35. One end of the guide rod 32 extends to the inner ring opening of the support ring 2 and is fixedly connected to the support block 33. Thus, by rotating multiple rotating parts 34, the support blocks 33 at the end of the screw 31 are brought closer to each other to accommodate the preheating of riser tubes of different sizes.

[0029] In this embodiment, to facilitate the limiting and fixing of the support assembly and ensure that the riser pipe 8 is located at the center of the heating furnace 1 during installation to achieve uniform preheating, a positioning mechanism 4 is also included, arranged in an array along the circumference of the support ring 2. The positioning mechanism 4 includes a limiting groove 41 disposed on the lower end face of the support ring 2, the limiting groove 41 being arranged radially along the support ring 2. A limiting block 42 is disposed within the limiting groove 41, and the limiting block 42 extends a predetermined distance above the end face of the support ring 2. A positioning rod 43 is disposed on the limiting groove 41. One end of the positioning rod 43 is rotatably connected to the groove wall at the end of the limiting groove 41. The other end of the positioning rod 43 passes through the support ring 2 and extends to the outside, where it is fixedly connected to the adjustment part 44. The positioning rod 43 located in the limiting groove 41 is provided with an external thread. The positioning rod 43 is threadedly connected to the limiting block 42 through the external thread. In use, the positioning mechanism 4 is positioned on the lower surface of the support ring 2. By rotating the adjustment part 44, the positioning rod 43 is rotated, thereby driving the limiting block 42 to slide on the limiting groove 41, so that the limiting block 42 abuts against the inner wall of the heating furnace 1.

[0030] In order to facilitate the control of the heating temperature of the heating resistance wire, a power distribution cabinet 5 is provided outside the heating furnace 1. The power distribution cabinet 5 is used to control the heating temperature of the heating resistance wire.

[0031] To facilitate the measurement of the temperature inside the furnace chamber of the heating furnace 1 and the temperature of the riser pipe 8, two thermocouples are installed inside the heating furnace 1, and both thermocouples are connected to the distribution cabinet 5.

[0032] To achieve the effect of heat preservation, the upper end of the support assembly is provided with a heat preservation cover 6, and the upper surface of the support ring 2 is provided with a limiting ring that cooperates with the lower end of the heat preservation cover 6 to better place the heat preservation cover 6. The top of the heat preservation cover 6 is provided with a lifting ring for easy hoisting.

[0033] In this embodiment, to better fit the end of the adjusting mechanism 3 located at the inner ring opening of the support ring 2 against the outer surface of the riser pipes 8 of different sizes, thereby achieving better fixation of the riser pipes, an auxiliary mechanism 7 is also included. The auxiliary mechanism 7 includes a limiting plate 71 and an elastic support 72. The limiting plate 71 is located on one side of the support block 33 and is positioned away from the guide rod 32. The limiting plate 71 is provided with two limiting holes 73. The side of the limiting plate 71 away from the support block 33 is connected to an elastic support via a connecting post 74. The support member 72 has two sliding grooves 75. The support block 33 is fixed with a top rod 76 on the side adjacent to the limiting plate 71. The other ends of the two top rods 76 extend through the two limiting holes 73 to the two sliding grooves 75 on the elastic support member 72. A spring 77 is provided on the top rod 76 between the support block 33 and the limiting plate 71, so that the limiting plate 71 moves left and right to drive the elastic support member 72 to bend so as to better fit the riser pipes of different sizes and facilitate better fixation of the riser pipe 8.

[0034] The present invention also provides a method for preheating a riser pipe, comprising the following steps: Place the bracket assembly on the upper surface of the heating furnace 1, and adjust the positioning mechanism 4 to make the limiting block 42, which is a predetermined distance above the end face of the support ring 2, lock onto the inner wall of the opening of the heating furnace 1. The riser pipe 8 is moved between multiple support blocks 33 using hoisting equipment, and the lower end of the riser pipe 8 extends into the heating furnace 1 to a predetermined depth. By rotating the rotating part 34, the multiple support blocks 33 are brought closer together and the riser pipe 8 is fixed, and the hoisting equipment is removed. One thermocouple is used to measure the temperature of the riser pipe 8, and the other thermocouple is used to measure the temperature inside the furnace of the heating furnace 1. The preheating temperature of the two thermocouples is set through the distribution cabinet 5. The dual control mode is adopted so that when the temperature inside the furnace of the heating furnace 1 or the temperature of the riser pipe 8 reaches the corresponding preheating temperature, the heating of the heating furnace 1 is disconnected through the distribution cabinet 5.

[0035] The thermocouple used to measure the riser tube 8 has a preset temperature lower than the other thermocouple used to measure the furnace chamber of the heating furnace 1. When the temperature inside the furnace chamber of the heating furnace 1 or the temperature of the riser tube 8 reaches the preset temperature and preheating is stopped, the riser tube 8 is heated by the residual heat inside the heating furnace 1 to avoid the riser tube 8 from getting too hot and to avoid safety accidents.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A preheating device for a riser pipe, comprising a heating furnace (1), wherein the upper end of the heating furnace (1) is open, characterized in that: A support assembly is provided at the upper opening of the heating furnace (1). The support assembly includes a support ring (2). The support ring (2) is installed on the upper surface of the heating furnace (1). Multiple adjustment mechanisms (3) are arranged in a circumferential array on the support ring (2). One end of each adjustment mechanism (3) extends to the outside of the support ring (2), and the other end extends to the inner ring opening of the support ring (2). The adjustment mechanism (3) is used to adjust the relative position of its end located at the inner ring opening of the support ring (2). The adjustment mechanism (3) includes a screw (31), a guide rod (32), and a support block (33). The screw (31) is arranged in the radial direction of the support ring (2) and threadedly connected to the support ring (2). One end of the screw (31) extends to the outside of the support ring (2) and is connected to a rotating part (34). The other end of the screw (31) extends to the inner ring opening of the support ring (2) and is rotatably connected to a support block (33). The support ring (2) is provided with a guide hole (35) parallel to the screw (31). A guide rod (32) is slidably connected to the guide hole (35). One end of the guide rod (32) extends to the inner ring opening of the support ring (2) and is fixedly connected to the support block (33). It also includes a positioning mechanism (4) arranged in an array along the circumference of the support ring (2). The positioning mechanism (4) includes a limiting groove (41) arranged on the lower end face of the support ring (2). The limiting groove (41) is arranged in the radial direction of the support ring (2). A limiting block (42) is arranged in the limiting groove (41), and the limiting block (42) is higher than the end face of the support ring (2) by a predetermined distance. A positioning rod (43) is arranged on the limiting groove (41). One end of the positioning rod (43) is rotatably connected to the groove wall at the end of the limiting groove (41). The other end of the positioning rod (43) passes through the support ring (2) and extends to the outside and is fixedly connected to an adjustment part (44). The positioning rod (43) located in the limiting groove (41) is provided with an external thread. The positioning rod (43) is threadedly connected to the limiting block (42) through the external thread.

2. The riser pipe preheating device according to claim 1, characterized in that: The heating furnace (1) includes a furnace body, and a heating resistance wire is arranged in a ring inside the furnace body.

3. The riser pipe preheating device according to claim 1, characterized in that: The heating furnace (1) is equipped with an external power distribution cabinet (5), which is used to control the heating temperature of the heating resistance wire.

4. The riser pipe preheating device according to claim 3, characterized in that: The heating furnace (1) is equipped with two thermocouples, both of which are connected to the power distribution cabinet (5).

5. The riser pipe preheating device according to claim 1, characterized in that: The upper end of the support assembly is provided with a heat insulation cover (6), and the top of the heat insulation cover (6) is provided with a hanging ring.

6. The riser pipe preheating device according to claim 1, characterized in that: It also includes an auxiliary mechanism (7), which includes a limiting plate (71) and an elastic support (72). The limiting plate (71) is located on one side of the support block (33) and is set away from the guide rod (32). The limiting plate (71) is provided with two limiting holes (73). The side of the limiting plate (71) away from the support block (33) is connected to the elastic support (72) by a connecting column (74). The elastic support (72) is provided with two sliding grooves (75). The side of the support block (33) adjacent to the limiting plate (71) is fixed with a top rod (76). The other ends of the two top rods (76) extend through the two limiting holes (73) to the two sliding grooves (75) on the elastic support (72). A spring (77) is provided on the top rod (76) between the support block (33) and the limiting plate (71).

7. A method for preheating a riser pipe, comprising the following steps: Place the support assembly on the upper surface of the heating furnace (1), and adjust the positioning mechanism (4) so ​​that the limiting block (42) which is higher than the end face of the support ring (2) by a predetermined distance is locked on the inner wall of the opening of the heating furnace (1); move the riser pipe (8) between multiple support blocks (33) by the hoisting equipment, and extend the lower end of the riser pipe (8) into the heating furnace (1) to a predetermined depth; By rotating the rotating part (34), multiple support blocks (33) are brought closer to each other and the riser pipe (8) is fixed and moved between multiple support blocks (33), and the lower end of the riser pipe (8) extends into the heating furnace (1) to a predetermined depth; By rotating the rotating part (34), multiple support blocks (33) are brought closer together and the riser pipe (8) is fixed, and the lifting equipment is removed; One thermocouple is used to measure the temperature of the riser pipe (8), and the other thermocouple is used to measure the temperature inside the furnace of the heating furnace (1). The preheating temperature of the two thermocouples is set through the distribution cabinet (5). The dual control mode is adopted so that when the temperature inside the furnace of the heating furnace (1) or the temperature of the riser pipe (8) reaches the corresponding preheating temperature, the heating of the heating furnace (1) is disconnected through the distribution cabinet (5). The preset temperature of the thermocouple used to measure the riser tube (8) is lower than the preset temperature of another thermocouple used to measure the furnace chamber of the heating furnace (1).

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