A low pressure casting device for metal castings

Abstract

The application relates to the technical field of low-pressure casting, and particularly discloses a metal casting low-pressure casting forming device which comprises a base, a liquid supply structure, a transposition structure, a jacking structure and a plurality of mold forming structures; the liquid supply structure is fixedly arranged on the upper wall of the base close to the left end; the transposition structure is fixedly arranged on the right side of the liquid supply structure; the jacking structure is fixedly arranged on the transposition structure; and the plurality of mold forming structures are fixedly arranged on the transposition structure. The metal casting low-pressure casting forming device is provided with a cross-shaped multi-station rotating frame, and the transposition structure and the jacking structure are cooperatively connected; a multi-station casting system capable of circulating switching is constructed; the pouring and filling of the casting, the cooling and shaping of the casting, the mold opening and demolding and the waiting of the mold can be synchronously completed; and the core pain point that the traditional single-station low-pressure casting equipment is on standby in the cooling and demolding stages of the casting is solved.

Description

Technical Field

[0001] This invention relates to the field of low-pressure casting technology, specifically to a low-pressure casting forming device for metal castings. Background Technology

[0002] Low-pressure casting is a common process for forming metal castings. With its advantages of stable filling, dense casting structure, and high forming precision, it is widely used in the production of precision metal parts for automobiles, machinery, and hardware. Traditional low-pressure casting equipment often adopts a single-station fixed structure, with one mold corresponding to one liquid supply system. The production process requires sequential completion of processes such as mold closing, pouring, cooling, mold opening, demolding, and cleaning, which presents significant technical shortcomings. Currently, mainstream equipment suffers from low demolding efficiency in actual production. In single-station operation mode, the equipment is in a waiting state during the casting cooling and demolding stages, unable to simultaneously pour the next set of castings, severely restricting continuous production efficiency. Furthermore, existing mold opening and closing mechanisms mostly use linear drive, resulting in insufficient mold closing precision and problems such as casting sticking to the mold and uneven stress leading to cracking during demolding. Summary of the Invention

[0003] The purpose of this invention is to provide a low-pressure casting molding device for metal castings, so as to solve the problems mentioned in the background art, such as the cumbersome mold replacement and maintenance process of traditional devices, the inability to quickly adapt to the production of castings of different specifications, poor versatility, and difficulty in meeting the problem of efficient and continuous low-pressure casting of metal castings.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-pressure casting forming device for metal castings, comprising a base, a liquid supply structure, a shifting structure, a lifting structure, and several mold-forming structures; the liquid supply structure is fixedly disposed on the upper wall of the base near the left end, the shifting structure is fixedly disposed on the right side of the liquid supply structure, the lifting structure is fixedly disposed on the shifting structure, and several mold-forming structures are respectively fixedly disposed on the shifting structure and arranged clockwise; the liquid supply structure provides low-pressure liquid metal supply, the shifting structure is used to replace the mold-forming structures to facilitate demolding and continuous casting, and the lifting structure is used to raise and lower the mold-forming structures when the shifting structure drives the mold-forming structures to shift positions, raising the mold-forming structures to detach them from the liquid supply structure and lowering them to attach the replacement mold-forming structures to the liquid supply structure; the mold-forming structures are used for mold forming, replacement, and convenient demolding of castings.

[0005] Preferably, the liquid supply structure includes a liquid supply tank, a liquid inlet, a sealing plate, a liquid outlet, a mold base, and an air compressor body. The liquid supply tank is rectangular, and a pressure interface is provided on the right side wall of the liquid supply tank near the top. The liquid inlet is fixedly embedded in the front side wall of the liquid supply tank, and the liquid inlet is located below the pressure interface. A sealing groove is provided on the front side wall of the liquid inlet. The sealing plate is detachably inserted into the sealing groove of the liquid inlet, and the sealing plate can block and seal the upper wall of the liquid inlet. One end of the liquid outlet is fixedly inserted through the middle of the upper wall of the liquid supply tank, and the other end of the liquid outlet is close to the lower inner wall of the liquid supply tank. The mold base is detachably placed on the upper wall of the liquid supply tank, and the mold base is fitted onto one end of the liquid outlet. A corresponding groove can be provided on the upper wall of the mold base, and the upper wall of the mold base fits with one end of the liquid outlet. The air compressor body is located on the right side of the liquid supply tank, and the air outlet of the air compressor body is connected to the pressure interface through a pipe.

[0006] Preferably, the switching structure includes a switching seat, a first sleeve, a pad, a first spring, a first telescopic rod, a rotating frame, a motor, a pair of pulleys, and a belt; the switching seat is fixedly installed on the upper wall of the base and located on the right side of the liquid supply tank; a transmission port is provided at the bottom of the switching seat; a first bearing is embedded at the top of the switching seat; the first sleeve is fixedly inserted through the middle of the first bearing; the first sleeve is a cylindrical body without an upper wall, and first guide grooves are symmetrically provided on the inner sidewall of the first sleeve; one end of the pad is fixedly installed in the middle of the lower inner wall of the first sleeve; the first spring is movably fitted on the outside of the pad, and one end of the first spring is fixedly connected to the lower inner wall of the first sleeve; one end of the first telescopic rod is movably inserted into... The first telescopic rod is installed inside the top of the first sleeve, and the side wall of the first telescopic rod is symmetrically provided with a first protrusion that fits into the first guide groove. One end of the first telescopic rod is fixedly connected to the top of the first spring, and one end of the first telescopic rod is attached to the pad. The other end of the first telescopic rod is located above the first sleeve. The middle part of the rotating frame is fixedly installed on the other end of the first telescopic rod. The rotating frame is cross-shaped with four equidistant ends, and the middle part of the rotating frame is a disc structure. The motor is fixedly installed on the bottom end of the shift seat. A pair of pulleys are respectively fixedly installed on the motor drive end and the bottom end of the first sleeve, and the pulleys are symmetrically located on the front and rear sides of the transmission port. The belt is movably fitted between the pulleys and passes through the transmission port.

[0007] Preferably, the lifting structure includes a first hydraulic cylinder body, a second sleeve, a second spring, a second telescopic rod, a wheel frame, and rollers; the first hydraulic cylinder body is fixedly inserted through the top of the shifting seat and located in front of the first bearing; one end of the second sleeve is fixedly mounted on the telescopic end of the first hydraulic cylinder body, and the second sleeve has the same structure as the first sleeve; one end of the second spring is fixedly mounted on the lower inner wall of the second sleeve; one end of the second telescopic rod is movably inserted into the second sleeve, and the second telescopic rod can rise and fall within the second sleeve; one end of the second telescopic rod is connected to the second spring; one end of the wheel frame is movably mounted on the other end of the second telescopic rod, and the wheel frame can rotate; the rollers are movably mounted on the wheel frame, and the rollers can fit against the lower wall of the middle part of the rotating frame.

[0008] Preferably, a plurality of the molding structures are equidistantly arranged on the four ends of the rotating frame; the molding structure includes an installation frame and two pairs of molding components; the installation frame is a rectangular frame, the installation frame is fixedly arranged on one end of the rotating frame, and the two pairs of molding components are symmetrically arranged at the middle of both ends of the installation frame.

[0009] Preferably, the molding assembly includes a limiting seat, a second hydraulic cylinder body, a push rod, a pair of push seats, and a pair of mold shells; the limiting seat is T-shaped, one end of the limiting seat is fixedly disposed at the middle of one end of the mounting frame, and the width of the other end of the limiting seat is greater than that of the first end, and the other end of the limiting seat is symmetrically provided with relatively inclined sliding grooves; the second hydraulic cylinder body is fixedly disposed on one end of the limiting seat, the push rod is fixedly disposed on the telescopic end of the second hydraulic cylinder body, and the push rod is perpendicular to the telescopic direction of the second hydraulic cylinder body; the pair of push seats are respectively movably disposed on the limiting seat and located at the sliding groove; the lower wall of each pair of push seats is provided with a sliding seat, and the sliding seat movably passes through the sliding groove for limiting; the middle parts of each pair of push seats are respectively movably fitted onto both ends of the push rod; and the pair of mold shells are symmetrically fixedly disposed on the other end of the push seats.

[0010] Preferably, the pair of mold shells can be docked at opposite ends by extending the main body of the second hydraulic cylinder and driving the pusher to move along the slide groove.

[0011] Preferably, the outer shells of the mold body in a pair of molding components can be mated together and fastened to the mold base.

[0012] Preferably, the rotating frame is raised by the top wheel and can be driven to rotate by a motor.

[0013] The low-pressure casting forming device for metal castings proposed in this invention has the following advantages: 1. This invention constructs a multi-station casting system that can be cyclically switched by using a cross-shaped multi-station rotating frame, combined with the coordinated linkage of the switching structure and the lifting structure. It can simultaneously complete the entire process of casting pouring and filling, cooling and shaping, mold opening and demolding, and mold waiting for material. It completely solves the core pain point of traditional single-station low-pressure casting equipment being idle during the casting cooling and demolding stages. The mold after pouring can be quickly switched to a non-pouring station for cooling and demolding. At the same time, the new mold to be poured is accurately switched to the pouring station and seamlessly connected with the liquid supply structure to achieve continuous and uninterrupted pouring, which greatly shortens the production cycle of a single casting and significantly improves the equipment capacity and production efficiency.

[0014] 2. This invention innovatively adopts an inclined slide guide-guided split mold structure for the molding components. Driven by a single hydraulic cylinder, the two pairs of mold shells can move synchronously in opposite directions along the inclined slide to close the mold. The mold closing process is precise in guidance, uniform in mold closing force distribution, and has good mold sealing, effectively avoiding molding defects such as liquid leakage and misshapen parts during low-pressure filling. During demolding, the mold bodies separate smoothly and obliquely along the inclined slide, and the demolding force is gradually released. This avoids problems such as casting sticking, deformation and cracking caused by uneven stress, which are common in traditional straight demolding methods. It not only ensures the integrity of the casting appearance and dimensional accuracy, but also ensures that the internal structure of the casting is dense and uniform, greatly improving the casting yield and molding quality.

[0015] 3. This invention utilizes the precise coordination of a lifting structure and a repositioning structure. Before repositioning, the lifting structure raises the entire rotating frame, completely separating the molding structure from the liquid supply structure before performing the rotational repositioning action. This completely avoids the problems of scratching and interference between the mold and the mold base during the repositioning process. The repositioning structure adopts a circumferential transmission structure with guide grooves and protrusions, ensuring precise transmission without circumferential offset. This guarantees the repeatability of the rotating frame's repositioning and ensures precise docking between the mold and the liquid supply / discharge structure after repositioning, guaranteeing pressure stability and process consistency during the low-pressure filling process. At the same time, the lifting structure uses a roller rolling mechanism and a spring buffer design, eliminating rigid friction during repositioning. Combined with a reset spring structure, this effectively reduces the impact of equipment operation, reduces component wear, improves the reliability of long-term continuous operation of the equipment, and significantly reduces the equipment failure rate.

[0016] 4. The mold base and mold shell of this invention both adopt a quick-change and detachable design, which can quickly replace the corresponding mold base and mold shell according to the shape and size specifications of the casting without modifying the main structure of the equipment, thus adapting to the production needs of castings of different specifications. At the same time, the inclined slide of the forming component has reserved sufficient travel space to accommodate the installation of mold shells of different sizes. The equipment has strong versatility, and the mold changing operation is simple and quick, which greatly shortens the debugging cycle of product changeover. It can meet the continuous production of large batches of single castings, as well as the flexible production needs of multiple varieties and small batches of castings, greatly expanding the applicable scenarios of the equipment.

[0017] In summary, this invention integrates core mechanisms such as liquid supply, positioning, lifting, and molding onto a single base, resulting in a compact and rational overall layout with minimal space occupation. The coordinated and interlocking actions of each mechanism ensure stable operation. The core structure is simple in design, with short transmission paths and few vulnerable parts. The liquid supply system features a reliable sealing structure and stable pressure control, guaranteeing long-term, stable execution of the low-pressure casting process. Furthermore, the core components are easy to assemble and disassemble, simplifying daily maintenance and troubleshooting, effectively reducing equipment operating costs and meeting the needs of long-term, continuous industrial production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention; Figure 2 This is a schematic diagram of the disassembled liquid supply structure of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the transposition structure of the present invention; Figure 4 This is a magnified schematic diagram of the disassembled lifting structure of the present invention; Figure 5 This is a magnified schematic diagram of the molded structure of the present invention. Figure 6 for Figure 5 A schematic diagram of the assembly structure; Figure 7 This is a partially enlarged structural diagram of point A in the present invention; Figure 8 This is a partially enlarged structural diagram of section B of the present invention.

[0019] In the diagram: 1. Base; 2. Liquid supply structure; 21. Liquid supply tank; 22. Liquid inlet; 23. Sealing plate; 24. Liquid outlet pipe; 25. Mold base; 26. Air compressor body; 3. Transposition structure; 31. Transposition seat; 32. First sleeve; 33. Pad column; 34. First spring; 35. First telescopic rod; 36. Rotating frame; 37. Motor; 38. Pulley; 39. Belt; 4. Lifting structure; 41. First hydraulic cylinder body; 42. Second sleeve; 43. Second spring; 44. Second telescopic rod; 45. Wheel frame; 46. Roller; 5. Molding structure; 51. Mounting frame; 52. Molding component; 521. Limiting seat; 522. Second hydraulic cylinder body; 523. Push rod; 524. Push seat; 525. Mold shell; 6. First bearing; 7. Guide groove; 8. Sealing groove; 9. Slide groove; 10. Slide seat. Detailed Implementation

[0020] The technical solutions of 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-8 This invention provides a technical solution: a low-pressure casting forming device for metal castings, comprising a base 1, a liquid supply structure 2, a shifting structure 3, a lifting structure 4, and several mold-forming structures 5; the liquid supply structure 2 is fixedly disposed on the upper wall of the base 1 near the left end, the shifting structure 3 is fixedly disposed on the right side of the liquid supply structure 2, the lifting structure 4 is fixedly disposed on the shifting structure 3, and several mold-forming structures 5 are respectively fixedly disposed on the shifting structure 3 and arranged clockwise; the liquid supply structure 2 realizes low-pressure liquid supply of metal, the shifting structure 3 is used to replace the mold-forming structures 5 to facilitate demolding and continuous casting, and the lifting structure 4 is used to raise and lower when the shifting structure 3 drives the mold-forming structures 5 to shift position, raising to disengage the mold-forming structures 5 from the liquid supply structure 2, and lowering to attach the replacement mold-forming structures 5 to the liquid supply structure 2; the mold-forming structures 5 are used for mold forming, replacement, and convenient demolding of castings.

[0022] As a preferred embodiment, the liquid supply structure 2 further includes a liquid supply tank 21, an inlet 22, a sealing plate 23, an outlet pipe 24, a mold base 25, and an air compressor body 26. The liquid supply tank 21 is rectangular, and a pressure interface is provided on the right side wall of the liquid supply tank 21 near the top. The inlet 22 is fixedly embedded in the front side wall of the liquid supply tank 21, and the inlet 22 is located below the pressure interface. A sealing groove 8 is provided on the front side wall of the inlet 22. The sealing plate 23 is detachably inserted into the sealing groove 8 of the inlet 22, and the sealing plate 23 can block and seal the upper wall of the inlet 22. One end of the outlet pipe 24 is fixedly inserted through the middle of the upper wall of the liquid supply tank 21, and the other end of the outlet pipe 24 is close to the lower inner wall of the liquid supply tank 21. The mold base 25 is detachably placed on the upper wall of the liquid supply tank 21, and the mold base 25 is fitted onto one end of the outlet pipe 24. The upper wall of the mold base 25 can be provided with a corresponding groove, and the mold... The upper wall of the base 25 fits into one end of the liquid outlet pipe 24. The air compressor body 26 is located on the right side of the liquid supply tank 21, and the air outlet of the air compressor body 26 is connected to the air pressure interface through a pipe. The liquid metal is added into the tank through the liquid inlet 22 on the front side wall of the liquid supply tank 21. After the addition is completed, the sealing plate 23 is inserted into the sealing groove 8 of the liquid inlet 22 to completely seal the liquid inlet 22 and ensure that a closed cavity is formed inside the liquid supply tank 21. The air compressor body 26 is started, and the compressed gas enters the upper cavity of the liquid supply tank 21 through the air pressure interface to form a stable low pressure inside the tank. Under the action of air pressure, the liquid metal is forced into the liquid outlet pipe 24 from the bottom end near the lower inner wall of the liquid supply tank 21 and transported upward to the position of the mold base 25. The mold base 25 is detachably assembled to the upper wall of the liquid supply tank 21 and precisely fits into the liquid outlet pipe 24. The liquid metal enters the mold cavity after docking through the mold base 25 to realize low-pressure filling and casting.

[0023] More specifically, the liquid supply structure 2 can achieve closed pressure holding and stable low-pressure liquid supply. The operation of adding and sealing the molten metal is simple and the sealing performance is reliable. The mold base 25 can be disassembled and replaced to adapt to different casting molding requirements. The whole can continuously and stably provide casting with pressure controllable and smooth delivery of molten metal, ensuring the quality of casting.

[0024] As a preferred embodiment, the shifting structure 3 further includes a shifting seat 31, a first sleeve 32, a pad 33, a first spring 34, a first telescopic rod 35, a rotating frame 36, a motor 37, a pair of pulleys 38, and a belt 39; the shifting seat 31 is fixedly mounted on the upper wall of the base 1 and located on the right side of the liquid supply tank 21; the bottom of the shifting seat 31 is provided with a transmission port; the top of the shifting seat 31 is fitted with a first bearing 6; the first sleeve 32 is fixedly inserted through the middle of the first bearing 6; the first sleeve 32 is a cylindrical body without an upper wall, and the inner side wall of the first sleeve 32 is symmetrically provided with first guide grooves 7; one end of the pad 33 is fixedly mounted in the middle of the lower inner wall of the first sleeve 32; the first spring 34... 4. The movable sleeve is fitted to the outside of the pad post 33, and one end of the first spring 34 is fixedly connected to the lower inner wall of the first sleeve 32. One end of the first telescopic rod 35 is movably inserted into the top end of the first sleeve 32, and the side wall of the first telescopic rod 35 is symmetrically provided with first protrusions that fit with the first guide groove 7. One end of the first telescopic rod 35 is fixedly connected to the top end of the first spring 34, and one end of the first telescopic rod 35 is attached to the pad post 33. The other end of the first telescopic rod 35 is located above the first sleeve 32. The middle part of the rotating frame 36 is fixedly installed on the other end of the first telescopic rod 35. The rotating frame 36 is cross-shaped with four equidistant ends, and the middle part of the rotating frame 36 is a disc structure. The motor 37 is fixedly installed on the... At the bottom of the base 31, a pair of pulleys 38 are respectively fixedly mounted on the drive end of the motor 37 and the bottom end of the first sleeve 32, with the pulleys 38 symmetrically located on both sides of the transmission port. The belt 39 is movably fitted between the pulleys 38 and passes through the transmission port. When the motor 37 starts, its power is transmitted through the pulleys 38 and belt 39 at the drive end to the pulleys 38 at the bottom of the first sleeve 32, causing the first sleeve 32 to rotate around the first bearing 6. The first guide groove 7 on the inner sidewall of the first sleeve 32 cooperates with the first protrusion on the sidewall of the first telescopic rod 35, causing the first telescopic rod 35 to rotate synchronously with the first sleeve 32, thereby driving the rotating frame 36 to achieve circumferential rotation. The pad inside the first sleeve 32 The column 33 supports the first telescopic rod 35, and the first spring 34 provides elastic support and restoring force for the first telescopic rod 35, so that the rotating frame 36 remains in a low position when it is not lifted, ensuring that the mold structure 5 and the mold base 25 are stably fitted together. When the rotating frame 36 is lifted by the lifting structure 4, the first telescopic rod 35 moves upward along the first guide groove 7, the first spring 34 is stretched, and the rotating frame 36 can rotate through the first sleeve 32 when it is in a high position. After the position is changed, the lifting structure 4 falls back, the first spring 34 pulls the first telescopic rod 35 to reset, and the rotating frame 36 falls back to its original position, realizing the precise docking of the next mold structure 5 and the mold base 25. After the rotating frame 36 is lifted up by the top wheel, it can be driven to rotate by the motor 37.

[0025] More specifically, the stable drive of the cross-shaped rotating frame 36 drives the multi-mold structure 5 to change positions in an orderly manner. With the help of the guide groove 7 and the protrusion, precise transmission is achieved to avoid rotational deviation. At the same time, it has the ability to automatically reset, ensuring that the lifting and rotating actions of the rotating frame 36 are smooth and reliable, providing stable support for continuous casting.

[0026] As a preferred embodiment, the lifting structure 4 further includes a first hydraulic cylinder body 41, a second sleeve 42, a second spring 43, a second telescopic rod 44, a wheel frame 45, and a roller 46. The first hydraulic cylinder body 41 is fixedly inserted through the top of the shifting seat 31 and located in front of the first bearing 6. One end of the second sleeve 42 is fixedly mounted on the telescopic end of the first hydraulic cylinder body 41, and the second sleeve 42 has the same structure as the first sleeve 32. One end of the second spring 43 is fixedly mounted on the lower inner wall of the second sleeve 42. One end of the second telescopic rod 44 is movably inserted into the second sleeve 42, and the second telescopic rod 44 can rise and fall within the second sleeve 42. One end of the second telescopic rod 44 is connected to the second spring 43. One end of the wheel frame 45 is movably mounted on the other end of the second telescopic rod 44, and the wheel frame 45 can rotate. The roller 46 is movably mounted on the wheel frame 45, and the roller... 46 can fit against the lower wall of the middle part of the rotating frame 36; the first hydraulic cylinder body 41 is started and extends upward, driving the second sleeve 42 to rise synchronously; the second telescopic rod 44 drives the wheel frame 45 and roller 46 to lift the lower wall of the middle part of the rotating frame 36, so that the rotating frame 36 is raised as a whole, realizing the separation of the mold structure 5 from the mold base 25; during the rotation and repositioning of the rotating frame 36, the roller 46 maintains rolling contact with the rotating frame 36, without hindering the rotation of the rotating frame 36, and at the same time, with the help of the second spring 43, the roller 46 is prevented from being damaged by excessive force. After the repositioning is completed, the first hydraulic cylinder body 41 retracts, driving the second sleeve 42, the second telescopic rod 44, the wheel frame 45 and the roller 46 to descend. The rotating frame 36 falls back under its own weight and the force of the first spring 34, so that the mold structure 5 reconnects with the mold base 25; the second spring 43 can provide buffer compensation to avoid rigid impact during the lifting and falling process, ensuring smooth operation.

[0027] More specifically, the lifting structure 4 can work with the rotating frame 36 to lift and lower, and work with the shifting structure 3 to complete the mold separation before shifting and docking after shifting. The rolling action does not affect the rotation of the rotating frame 36, and the buffer structure reduces the impact of movement. The overall action is stable and the response is rapid, providing key lifting and lowering guarantees for multi-station continuous casting.

[0028] As a preferred embodiment, further, several of the molding structures 5 are equidistantly arranged on the four ends of the rotating frame 36; the molding structure 5 includes an installation frame 51 and two pairs of molding components 52; the installation frame 51 is a rectangular frame, the installation frame 51 is fixedly arranged on one end of the rotating frame 36, and the two pairs of molding components 52 are symmetrically arranged at the middle of both ends of the installation frame 51.

[0029] As a preferred embodiment, the molding component 52 further includes a limiting seat 521, a second hydraulic cylinder body 522, a push rod 523, a pair of push seats 524, and a pair of mold shells 525. The limiting seat 521 is T-shaped, with one end fixedly disposed at the middle of one end of the mounting frame 51, and the other end of the limiting seat 521 being wider than the first end. The other end of the limiting seat 521 is symmetrically provided with relatively inclined sliding grooves 9. The second hydraulic cylinder body 522 is fixedly disposed on one end of the limiting seat 521. The push rod 523 is fixedly disposed on the telescopic end of the second hydraulic cylinder body 522, and the push rod 523 is perpendicular to the telescopic direction of the second hydraulic cylinder body 522. The pair of push seats 524 are respectively movably disposed on the limiting seat 521 and located at the sliding groove 9. Each of the lower walls of the pair of push seats 524 is provided with a sliding seat 10. The movable through-slide groove 9 is used for limiting. The middle parts of the pair of push seats 524 are respectively movably fitted onto the two ends of the push rod 523. The pair of mold shells 525 are symmetrically fixed on the other end of the push seats 524. The second hydraulic cylinder body 522 is started and extended, driving the push rod 523, which is perpendicular to its extension direction, to move synchronously. The two ends of the push rod 523 respectively drive the pair of push seats 524 to move. The slide seat 10 at the bottom of the push seat 524 slides directionally along the inclined slide groove 9 symmetrically arranged on the limiting seat 521. Under the guidance of the slide groove 9, the pair of push seats 524 drive the mold shells 525 to move relatively closer, that is, the push seats 524 slide on the push rod 523. Until the two sets of mold shells 525 are precisely aligned to form a complete casting cavity. When demolding, the second hydraulic cylinder body 522 retracts, driving the push rod 523 to move in the opposite direction to realize the separation of the mold shells 525.

[0030] More specifically, by cooperating with the linear motion of the inclined slide 9 and the main body 522 of the second hydraulic cylinder, the mold shell 525 is precisely docked and smoothly separated, the mold closing positioning is reliable, the demolding is smooth and not easy to stick to the mold, the structure is compact and the operation is stable, and it can be adapted to replace mold shells 525 of different specifications, thereby improving the versatility of the device and the casting quality.

[0031] As a preferred embodiment, the pair of mold shells 525 can be extended by the second hydraulic cylinder body 522 to drive the pusher 524 to move along the slide groove 9 to dock at opposite ends; the mold shells 525 in the pair of molding components 52 can dock relative to each other and be fastened to the mold base 25.

[0032] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0033] First, the equipment uses the base 1 as the integrated support body, and the liquid supply structure 2 completes the sealing and low-pressure transportation of the molten metal. The molten metal is added into the liquid supply tank 21 through the liquid inlet 22. After the filling is completed, the sealing plate 23 is inserted into the sealing groove 8 to achieve sealing. Start the air compressor body 26. Compressed air enters the liquid supply tank 21 through the air pressure interface and is located above the molten metal. Under the action of air pressure, the molten metal is pressed downward and transported to the mold base 25 through the liquid outlet pipe 24 to provide power for casting. The mold-forming structure 5 completes the mold-closing action, that is, the main body 522 of the second hydraulic cylinder extends and drives the push rod 523 to move, so that the slide 10 at the bottom of the push seat 524 slides in a direction along the inclined slide groove 9 on the limit seat 521. The two pairs of symmetrical mold shells 525 approach each other and precisely dock to form a closed cavity. The whole is snapped onto the mold base 25, and the molten metal is filled and formed under low pressure. After the casting is cooled and formed, the lifting structure 4 is activated, and the main body 41 of the first hydraulic cylinder extends upward. Through the second sleeve 42, the second spring 43, and the second telescopic rod 44, the wheel frame 45 and the roller 46 are driven to lift the rotating frame 36, so that the rotating frame 36 drives the first telescopic rod 35 to move upward along the guide groove 7 of the first sleeve 32. The first spring 34 is stretched, and the forming structure 5 is lifted and completely separated from the mold base 25. Subsequently, the switching structure 3 is activated. The motor 37 drives the first sleeve 32 to rotate around the first bearing 6 through the pulley 38 and belt 39. With the cooperation of the guide groove 7 and the first telescopic rod 35, it drives the rotating frame 36 to rotate, completing the station switching of the molding structure 5. During the switching process, the rotation of the rotating frame 36 will contact the roller, driving the roller 46 to rotate. At the same time, it will drive the wheel frame 45 to rotate at a certain angle on the second telescopic rod 44 for cooperation. Moreover, the second spring 43 can be pressed down by the second telescopic rod 44 to buffer and prevent the roller 46 from jamming. After the position is changed, the main body 41 of the first hydraulic cylinder retracts, and the first spring 34 pulls the first telescopic rod 35 and the rotating frame 36 to fall back, and the new mold structure 5 re-connects precisely with the mold base 25. Meanwhile, the molded structure 5, which has been poured, rotates to a non-pouring position with the rotating frame 36. After cooling, the main body 522 of the second hydraulic cylinder retracts, and the pusher 524 drives the outer shell of the mold body 525 to separate in opposite directions. The pusher 524 moves along the slide groove 9 with the help of the slide block 10. At the same time, the pusher 524 slides on the push rod 523, which causes the two pairs of outer shells of the mold body 525 to separate, so as to achieve smooth demolding of the casting. By repeating the above actions, continuous and automated low-pressure casting molding operation can be achieved. The equipment can also be modified to replace the corresponding mold base 25 and mold shell 525 according to the actual casting needs, so as to realize the casting of different castings and castings of different sizes, as long as it is within the stroke range of the slide 9 and the mounting frame 51.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-pressure casting forming device for metal castings, characterized in that, It includes a base (1), a liquid supply structure (2), a displacement structure (3), a lifting structure (4), and several molding structures (5); the liquid supply structure (2) is fixedly installed on the upper wall of the base (1) near the left end, the displacement structure (3) is fixedly installed on the right side of the liquid supply structure (2), the lifting structure (4) is fixedly installed on the displacement structure (3), and several molding structures (5) are respectively fixedly installed on the displacement structure (3) and arranged clockwise; The liquid supply structure (2) realizes low-pressure liquid metal supply, the switching structure (3) is used to replace the mold structure (5) to facilitate demolding and continuous casting, the lifting structure (4) is used to lift and lower when the switching structure (3) drives the mold structure (5) to switch positions, the rising makes the mold structure (5) separate from the liquid supply structure (2), and the lowering makes the replacement mold structure (5) snap onto the liquid supply structure (2), the mold structure (5) is used for mold forming, replacement and convenient demolding of castings; The liquid supply structure (2) includes a liquid supply tank (21), a liquid inlet (22), a sealing plate (23), a liquid outlet pipe (24), a mold base (25), and an air compressor body (26). The liquid supply tank (21) is rectangular, and a pressure port is provided on the right side wall of the liquid supply tank (21) near the top. The liquid inlet (22) is fixedly embedded in the front side wall of the liquid supply tank (21), and the liquid inlet (22) is located below the pressure port. A sealing groove (8) is provided on the front side wall of the liquid inlet (22). The sealing plate (23) is detachably inserted into the sealing groove (8) of the liquid inlet (22), and the sealing plate (23) can block and seal the upper wall of the liquid inlet (22). One end of the liquid outlet pipe (24) is fixedly inserted through the liquid supply tank (21). 1) The middle part of the upper wall, and the other end of the liquid outlet pipe (24) is close to the lower inner wall of the liquid supply tank (21). The mold base (25) is detachably placed on the upper wall of the liquid supply tank (21), and the mold base (25) is fitted onto one end of the liquid outlet pipe (24). The upper wall of the mold base (25) can be provided with a corresponding groove, and the upper wall of the mold base (25) fits with one end of the liquid outlet pipe (24). The air compressor body (26) is located on the right side of the liquid supply tank (21), and the air outlet end of the air compressor body (26) is connected to the air pressure interface through a pipe. Several molding structures (5) are equidistantly arranged on the four ends of the rotating frame (36); the molding structure (5) includes an installation frame (51) and two pairs of molding components (52); the installation frame (51) is a rectangular frame, the installation frame (51) is fixedly arranged on one end of the rotating frame (36), and the two pairs of molding components (52) are symmetrically arranged at the middle of both ends of the installation frame (51); The molding assembly (52) includes a limiting seat (521), a second hydraulic cylinder body (522), a push rod (523), a pair of push seats (524), and a pair of mold shells (525); The limiting seat (521) is T-shaped. One end of the limiting seat (521) is fixedly installed at the middle of one end of the mounting frame (51), and the width of the other end of the limiting seat (521) is greater than that of the first end. The other end of the limiting seat (521) is symmetrically provided with relatively inclined sliding grooves (9). The second hydraulic cylinder body (522) is fixedly installed on one end of the limiting seat (521), and the push rod (523) is fixedly installed on the telescopic end of the second hydraulic cylinder body (522). The push rod (523) and the second hydraulic cylinder body (522) are connected. The extension and retraction directions of the cylinder body (522) are perpendicular to each other. A pair of push seats (524) are respectively movably mounted on the limiting seat (521) and located at the slide groove (9). A slide seat (10) is provided on the lower wall of each pair of push seats (524), and the slide seat (10) moves through the slide groove (9) for limiting. The middle part of the pair of push seats (524) is respectively movably mounted on both ends of the push rod (523). A pair of mold shells (525) are symmetrically fixed on the other end of the push seats (524).

2. The low-pressure casting forming apparatus for metal castings according to claim 1, characterized in that, The transposition structure (3) includes a transposition seat (31), a first sleeve (32), a pad (33), a first spring (34), a first telescopic rod (35), a rotating frame (36), a motor (37), a pair of pulleys (38), and a belt (39). The shifting seat (31) is fixedly installed on the upper wall of the base (1) and located on the right side of the liquid supply tank (21). The shifting seat (31) has a transmission port at its bottom. The shifting seat (31) has a first bearing (6) embedded at its top. The first sleeve (32) is fixedly inserted through the middle of the first bearing (6). The first sleeve (32) is a cylindrical body without an upper wall, and the inner side wall of the first sleeve (32) is symmetrically provided with a first guide groove (7). One end of the pad (33) is fixedly installed in the middle of the lower inner wall of the first sleeve (32). The first spring (34) is movably fitted on the outside of the pad (33), and one end of the first spring (34) is fixedly connected to the lower inner wall of the first sleeve (32). One end of the first telescopic rod (35) is movably inserted into the top of the first sleeve (32), and the side wall of the first telescopic rod (35) is symmetrically provided with a guide groove (7) corresponding to the first bearing (6). The guide groove (7) fits the first protrusion, one end of the first telescopic rod (35) is fixedly connected to the top of the first spring (34), and one end of the first telescopic rod (35) is attached to the pad (33). The other end of the first telescopic rod (35) is located above the first sleeve (32). The middle part of the rotating frame (36) is fixedly set on the other end of the first telescopic rod (35). The rotating frame (36) is a cross shape with four equally spaced ends, and the middle part of the rotating frame (36) is a disc structure. The motor (37) is fixedly set on the bottom end of the shift seat (31). A pair of pulleys (38) are respectively fixedly set on the driving end of the motor (37) and the bottom end of the first sleeve (32). The pulleys (38) are symmetrically located on the front and rear sides of the transmission port. The belt (39) is movably fitted between the pulleys (38), and the belt (39) passes through the transmission port.

3. The low-pressure casting forming apparatus for metal castings according to claim 2, characterized in that, The lifting structure (4) includes a first hydraulic cylinder body (41), a second sleeve (42), a second spring (43), a second telescopic rod (44), a wheel frame (45), and a roller (46). The first hydraulic cylinder body (41) is fixedly inserted through the top of the shift seat (31) and located in front of the first bearing (6). One end of the second sleeve (42) is fixedly set on the telescopic end of the first hydraulic cylinder body (41), and the second sleeve (42) has the same structure as the first sleeve (32). One end of the second spring (43) is fixedly set on the lower inner wall of the second sleeve (42). One end of the second telescopic rod (44) is movably inserted into the second sleeve (42), and the second telescopic rod (44) can rise and fall inside the second sleeve (42). One end of the second telescopic rod (44) is connected to the second spring (43). One end of the wheel frame (45) is movably set on the other end of the second telescopic rod (44), and the wheel frame (45) can rotate. The roller (46) is movably set on the wheel frame (45), and the roller (46) can fit against the lower wall of the middle part of the rotating frame (36).

4. The low-pressure casting forming apparatus for metal castings according to claim 3, characterized in that, The pair of said mold shells (525) can be extended by the second hydraulic cylinder body (522) to drive the pusher (524) to move along the slide (9) to dock at one end.

5. The low-pressure casting forming apparatus for metal castings according to claim 4, characterized in that, The mold shells (525) of a pair of molding components (52) can be mated together and fastened to the mold base (25).

6. The low-pressure casting forming apparatus for metal castings according to claim 5, characterized in that, The rotating frame (36) is raised by the top wheel and can be driven to rotate by the motor (37).

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