Lost foam casting machine

Abstract

The invention discloses an evanescent mode casting machine, and relates to the technical field of metal part production, the evanescent mode casting machine comprises a sand storage box, the top of the sand storage box is fixedly connected with a casting box, one side of the interior of the casting box is provided with an isolation cavity, the interior of the isolation cavity is provided with a negative pressure assembly, and the other side of the casting box is provided with a casting cavity; a cover plate is rotationally connected to one side of the top of the casting box, an observation window is fixedly connected to one side of the casting box, after the vibration sand box piece is cast, internal components of the vibration sand box piece stretch to enable sand grains to naturally fall, the sand grains synchronously pass through the vibration screen assembly in the falling process, and agglomerates, overlarge particles and impurities in the sand grains are efficiently removed through operation of the vibration screen assembly; and the purified sand grains are directly sent back to the vibration sand box piece through the sand conveying piece to be used for sand injection next time, the linkage process of sand discharging, vibration screening and sand conveying greatly improves the purity of sand grain recycling, the risk that sand hole defects appear on the surface of a finished product during subsequent casting is reduced from the source, and a foundation is laid for casting quality.

Description

Technical Field

[0001] This application relates to the field of metal parts manufacturing technology, and in particular to a lost foam casting machine. Background Technology

[0002] Lost foam casting is a precision model made from foamed plastics (such as polystyrene EPS, copolymer resin STMMA, etc.) through pre-foaming and molding. Its shape and size are completely identical to the metal part to be cast, and its surface is coated with a high-temperature resistant and fire-resistant coating to enhance strength and heat resistance. The core characteristic of this model is that it "vaporizes and disappears when heated," meaning it does not need to be removed during the casting process. It provides a complete molding space for the molten metal, fundamentally simplifying the parting and demolding process of traditional casting, and is especially suitable for the integrated molding of complex-shaped parts.

[0003] Lost foam casting machines achieve metal part casting through the core logic of "model placement - metal filling": First, the prepared lost foam model is placed into a sand box, surrounded by binder-free dry sand. The dry sand is compacted by the three-dimensional vibration table of the casting machine, while the vacuum system is activated to create a stable negative pressure environment inside the sand box. Subsequently, the casting machine's gating system injects high-temperature molten metal into the sand box at a preset speed. Upon contact with the lost foam, the molten metal rapidly vaporizes, burns, and is discharged, quickly filling the space occupied by the model. Under negative pressure, the molten metal maintains its fluidity and fully fills the cavity. After cooling and solidification, the casting machine releases the negative pressure, and the dry sand is cleaned to obtain a metal part that perfectly matches the shape of the lost foam. Throughout the process, the compaction, vacuum degree, and pouring parameters are precisely controlled by the mechanical structure to ensure the precision and molding quality of the casting.

[0004] Most existing lost foam casting machines first place the foam model in a sand box, then fill the sand box with sand to compact it and fix the foam model. After that, the foam model is poured in to cast the workpiece. After the casting is completed, the sand needs to be loosened and then poured out for the next sand pour. However, the sand particles after casting may contain impurities or clumps. If these are not treated, when the sand particles are poured in again, it will cause sand hole defects on the surface of the finished parts during subsequent casting, thereby reducing the production quality of the cast products and hindering the production of metal parts. Summary of the Invention

[0005] The purpose of this application is to address the problem in the background art where impurities or agglomerates exist inside the sand grains after casting. If these impurities are not treated, the sand grains will cause sand hole defects on the surface of the finished parts during subsequent casting if they are refilled, thereby reducing the production quality of the cast products and hindering the production of metal parts. This application provides a lost foam casting machine.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A lost foam casting machine includes a sand storage tank, a casting box fixedly connected to the top of the sand storage tank, an isolation cavity provided on one side of the casting box, a negative pressure component installed inside the isolation cavity, a casting chamber provided on the other side of the casting box, and a cover plate rotatably connected to the top side of the casting box. An observation window is fixedly connected to one side of the casting box. A vibrating sand box component is installed inside the casting chamber, communicating with the bottom of the casting chamber. A sand conveying component is fixedly connected to one side of the sand storage tank, and the output end of the sand conveying component is installed on the cover plate. A vibrating screen component is installed on one side of the inside of the sand storage tank. The vibrating screen assembly is located directly below the vibrating sand box. A linkage assembly is installed on one side of the sand storage box, and an agitator is installed on one side inside the sand storage box. A magnetic suction assembly is installed in the middle inside the sand storage box. The vibrating screen assembly, linkage assembly, agitator, and magnetic suction assembly are connected by transmission. A backflushing cleaning component is installed on the negative pressure assembly. The agitator and backflushing cleaning component are connected by transmission. A control panel is fixedly connected to one side of the casting box. Symmetrical refrigerators are installed on one side of the sand storage box. The control panel is electrically connected to the sand conveying component, vibrating sand box, vibrating screen assembly, refrigerator, and negative pressure assembly.

[0008] By adopting the above technical solution, after the vibrating sand box is cast, its internal components extend, causing the sand particles to fall naturally. During the fall, the sand particles pass through the vibrating screen assembly simultaneously. The operation of the vibrating screen assembly efficiently removes clumps, oversized particles, and impurities from the sand particles. The purified sand particles are then directly sent back to the vibrating sand box by the sand conveying component for use in the next sand injection. This linkage process of sand discharge, vibrating screen, and sand conveying significantly improves the purity of sand particle recycling, reducing the risk of sand hole defects on the surface of the finished product during subsequent casting from the source, thus laying the foundation for casting quality.

[0009] Furthermore, the sand conveying device includes a sand pump fixedly connected to one side of the sand storage tank, a conveying pipe fixedly connected to the output end of the sand pump, a material conveying hose fixedly connected to one end of the conveying pipe, a connecting nozzle fixedly connected to one end of the material conveying hose, and the connecting nozzle being installed on the cover plate.

[0010] By adopting the above technical solution, the sand particles inside the sand storage box can be extracted by the operation of the sand pump and injected into the vibrating sand box through the connected nozzle, thereby realizing the sand injection treatment of the vibrating sand box.

[0011] Furthermore, the vibrating sand box component includes a vibrating seat symmetrically and fixedly connected inside the casting cavity. A connecting plate is installed on one side of the vibrating seat, and a sand box is placed on the vibrating seat. An electric sealing plate is installed at the bottom of the sand box, and a sand discharge cylinder is fixedly connected to the bottom of the sand box. A flow port is opened at the top of the sand storage box, and the sand discharge cylinder is inserted into the flow port. The sand box and the connecting plate are fixed together by multiple positioning pins.

[0012] By adopting the above technical solution, the electric sealing plate is slidably installed at the bottom of the sand box. By extending and contracting the sand box, the bottom of the sand box can be closed and opened. The outer side of the sand discharge cylinder is wrapped with a rubber coating, which forms a seal when inserted into the flow port, and will not affect the negative pressure inside the casting cavity.

[0013] Furthermore, a sand guide slope is provided on one side of the interior of the sand storage box, and the vibrating screen assembly includes multiple elastic telescopic rods fixedly connected to the top of the sand storage box. One end of each elastic telescopic rod is fixedly connected to a screen plate, which is inclined. An impacting element is installed on one side of the interior of the sand storage box, and the screen plate is located directly below the flow port.

[0014] By adopting the above technical solution, the elastic telescopic rod consists of a sleeve rod, an inner rod, and a spring, which can support and guide the movement of the screen plate. At the same time, the elasticity of the spring can increase the vibration frequency of the screen plate.

[0015] Furthermore, the striking component includes a servo motor fixedly connected to one side of the sand storage tank. The output end of the servo motor is fixedly connected to a rotating rod, and symmetrical protrusions are fixedly connected to the rotating rod. The protrusions are located below the screen plate.

[0016] By adopting the above technical solution, the rotating rod can be driven to rotate under the operation of the servo motor. The rotating rod can drive the protrusion, causing the protrusion to rotate and thus intermittently strike both ends of the bottom of the screen plate.

[0017] Furthermore, the linkage assembly includes a connecting box fixedly connected to one side of the sand storage tank. A transmission rod is rotatably connected inside the connecting box. A bevel gear is fixedly connected to the top end of the transmission rod, and a driven disc is fixedly connected to the bottom end of the transmission rod. A transmission disc is rotatably connected to one side of the connecting box. A bevel gear is fixedly connected to one side of the transmission disc. The bevel gears are meshed together. A transmission disc is fixedly connected to one end of the rotating rod. The transmission discs are connected via a transmission belt. A driven disc is rotatably connected to one side of the bottom of the sand storage tank. The driven discs are connected via a transmission belt. A linkage disc is fixedly connected to the bottom of the driven disc.

[0018] By adopting the above technical solution, when the rotating rod rotates, it can drive the second transmission disk to rotate. The rotating second transmission disk can drive the first transmission disk to rotate through the first transmission belt, so that the first transmission disk drives the second bevel gear to rotate and engages with the first bevel gear, so that the first bevel gear drives the transmission rod to rotate, thereby driving the driven disk to rotate, thus driving the agitator and the magnetic suction assembly.

[0019] Furthermore, the agitator includes a turntable one rotatably connected to one side inside the sand storage tank, a plurality of agitating rods are fixedly connected to the top of the turntable one, and a turntable two is fixedly connected to the top of the agitating rods, and the bottom of the turntable one is fixedly connected to the driven plate two.

[0020] By adopting the above technical solution, the surface of the stirring rod is coated with a friction-resistant coating, which can reduce the wear caused by stirring sand particles.

[0021] Furthermore, the magnetic suction assembly includes a connecting box fixedly connected to one side of the sand storage box, a collection box fixedly connected to one end of the connecting box, a drive roller rotatably connected inside both the sand storage box and the connecting box, a conveyor belt drivingly connected to both ends of the drive roller, a plurality of electromagnetic suction rods fixedly connected between the two conveyor belts, a linkage disc two fixedly connected to the bottom end of the drive roller located inside the connecting box, the linkage disc two and the linkage disc one being drivenly connected via a transmission belt three, a controller fixedly connected to the top of the connecting box, and a slag guide slope provided at the bottom inside the connecting box, and a cleaning brush fixedly connected to the middle inside the collection box.

[0022] By adopting the above technical solution, the controller integrates a control chip and a sensing chip. The control chip can control the opening and closing of the electromagnetic rod, while the sensing chip can sense the position of the electromagnetic rod to cooperate with the control chip to control the start and stop of the electromagnetic rod.

[0023] Furthermore, the negative pressure assembly includes a negative pressure machine fixedly connected inside the isolation chamber. An electric air valve is fixedly connected to the air extraction end of the negative pressure machine. An air passage is fixedly connected to one side of the electric air valve. An air suction pipe is fixedly connected to one end of the air passage. Multiple air suction ports are fixedly connected to the air suction pipe, and the air suction pipe is located inside the casting chamber.

[0024] By adopting the above technical solution, the negative pressure machine operates to draw air from the inside of the ventilation duct and draw air from the inside of the casting cavity through the suction pipe and suction port, thereby creating a negative pressure inside the casting cavity.

[0025] Furthermore, the backflushing cleaning component includes a blower fixedly connected inside the isolation chamber. An electric air valve is fixedly connected to the top of the blower, and the electric air valve communicates with the air passage. A linkage rod is rotatably connected inside the blower, and a fan blade is fixedly connected to one end of the linkage rod. The linkage rod is fixedly connected to the turntable.

[0026] By adopting the above technical solution, the rotation of turntable two can drive the linkage rod to rotate, and the rotating linkage rod can drive the fan blade to rotate, so that air force is generated inside the blower and blown into the air passage through electric air valve two.

[0027] In summary, this application includes at least one of the following beneficial effects;

[0028] 1. In this application, after the vibrating sand box is cast, its internal components extend, causing the sand particles to fall naturally. During the fall, the sand particles pass through the vibrating screen assembly. The operation of the vibrating screen assembly efficiently removes clumps, oversized particles, and impurities from the sand particles. The purified sand particles are then directly sent back to the vibrating sand box by the sand conveying component for use in the next sand injection. This linkage process of sand discharge, vibrating screen, and sand conveying significantly improves the purity of sand particle recycling, reduces the risk of sand hole defects on the surface of the finished product during subsequent casting from the source, and lays the foundation for casting quality.

[0029] 2. In this application, the vibrating screen assembly synchronously drives the linkage assembly to operate. The linkage assembly further drives the agitator to uniformly agitate the sand particles in the sand storage box. At the same time, the refrigeration unit is used to achieve sufficient heat dissipation of the sand particles. Through the linkage of multiple components such as vibrating screen, linkage, agitation and refrigeration, the temperature of the recycled sand particles is effectively reduced, avoiding damage to the foam model when the high-temperature sand particles are refilled. This further reduces casting defects in the finished metal parts and promotes a steady improvement in casting quality. At the same time, when the agitator is running, it can also further disperse the sand particles after vibrating screen, further removing small clumps in the sand particles. This, together with the vibrating screen assembly, improves the processing quality of the sand particles. In addition, it can also eliminate the hidden problem of secondary agglomeration of sand particles after vibrating screen and letting them stand.

[0030] 3. In this application, while the linkage component drives the agitator to operate, it simultaneously drives the magnetic suction component to operate inside the sand storage box, performing secondary impurity removal on the sand particles after the vibrating screen treatment. This precisely removes residual metal debris from the sand particles. This dual impurity removal linkage design of initial cleaning by vibrating screen, linkage drive, and magnetic suction fine cleaning further improves the purity of the sand particles, reduces the probability of metal debris adhering to the surface of the finished product, and further optimizes the quality of the casting product. In addition, the linkage mechanism simultaneously drives the sand particles to agitate in conjunction with cooling and magnetic suction impurity removal. The two form a synergistic effect of dynamic impurity removal and uniform cooling in the sand storage box, further improving the processing efficiency of sand particles, thereby improving the quality of sand particle circulation processing. At the same time, when the agitator agitates the sand particles, the magnetic suction component can cooperate with the agitator to perform continuous magnetic suction impurity removal, thereby achieving synergistic effect of debris exposure and debris adsorption in a dynamic environment, solving the industry pain point of incomplete static magnetic adsorption.

[0031] 4. In this application, when the agitator operates, its internal components synchronously drive the back-blowing cleaning component. The air force generated by the back-blowing cleaning component is directly sent into the negative pressure assembly to perform air-blowing cleaning of the negative pressure assembly, promptly blowing out sand particles that have entered the interior and preventing blockage of the negative pressure assembly. Through the linkage mechanism of agitation, back-blowing, and negative pressure stabilization, the negative pressure stability of subsequent casting is maintained to the maximum extent, preventing a sudden drop in vacuum during vacuum extraction that could lead to insufficient compaction of dry sand, thereby avoiding the risk of sand mold collapse during molten metal filling. This provides dual protection for the reliability of the casting process and the quality of the finished product. In addition, the rotational kinetic energy of the agitator drives the back-blowing cleaning component to convert into back-blowing air force, directly providing cleaning power for the negative pressure assembly, realizing a self-cleaning closed loop of sand treatment and negative pressure maintenance. At the same time, this application, through a closed-loop design with one source driving and four-effect linkage, realizes a closed-loop system with the vibrating screen as the core power, constructing a vibrating screen, linkage, agitation, magnetic attraction, and back-blowing, maximizing the efficiency and quality of sand particle treatment. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this application;

[0033] Figure 2 This is another structural view of this application;

[0034] Figure 3 This is a partial structural diagram of this application;

[0035] Figure 4 This is a structural schematic diagram of the vibrating sand box component in this application;

[0036] Figure 5 This is a schematic diagram of the structure of the vibrating screen assembly in this application;

[0037] Figure 6 This is a schematic diagram of the linkage component in this application;

[0038] Figure 7 This is a schematic diagram of the installation structure of the agitator in this application;

[0039] Figure 8 This is a schematic diagram of the magnetic attraction component in this application;

[0040] Figure 9 This is a schematic diagram of the connection structure of the vibrating screen assembly, linkage assembly, agitator and magnetic suction assembly in this application;

[0041] Figure 10 This is a structural schematic diagram of the negative pressure component and the backflushing cleaning component in this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Sand storage box; 2. Casting box; 3. Sand conveying components; 4. Control panel; 5. Vibrating sand box components; 6. Vibrating screen assembly; 7. Linkage assembly; 8. Agitator; 9. Refrigeration unit; 10. Negative pressure assembly; 11. Backflushing cleaning components; 12. Magnetic suction assembly; 13. Sand guide slope; 21. Observation window; 22. Cover plate; 23. Isolation chamber; 31. Sand pump; 32. Conveying pipe; 33. Conveying hose; 34. Connecting nozzle; 51. Vibrating seat; 52. Connecting plate; 53. Sand box; 54. Electric sealing plate; 55. Positioning pin; 56. Sand discharge cylinder; 61. Screen plate; 62. Elastic telescopic rod; 63. Servo motor; 64. Rotating rod; 65. Protrusion; 71. Connecting box; 72. Transmission rod; 73. Bevel gear one; 74. 75. Bevel gear 2; 76. Transmission disc 1; 77. Transmission belt 1; 78. Transmission disc 2; 79. Driven disc 1; 70. Linkage disc 1; 710. Transmission belt 2; 711. Driven disc 2; 712. Transmission belt 3; 81. Turntable 1; 82. Stirring rod; 83. Turntable 2; 101. Negative pressure machine; 102. Electric air valve 1; 103. Vent duct; 104. Suction pipe; 105. Suction port; 111. Blower; 112. Electric air valve 2; 113. Linkage rotating rod; 114. Fan blade; 121. Collection box; 122. Connecting box; 123. Cleaning brush; 124. Drive roller; 125. Conveyor belt; 126. Electromagnetic suction rod; 127. Linkage disc 2; 128. Slag guide slope; 129. Controller. Detailed Implementation

[0044] The following is in conjunction with the appendix Figures 1-10 This application will be described in further detail.

[0045] This application discloses a lost foam casting machine.

[0046] Reference Figures 1 to 3A lost foam casting machine includes a sand storage box 1, a casting box 2 fixedly connected to the top of the sand storage box 1, an isolation cavity 23 provided on one side of the casting box 2, a negative pressure component 10 installed inside the isolation cavity 23, a casting cavity provided on the other side of the casting box 2, and a cover plate 22 rotatably connected to the top side of the casting box 2. An observation window 21 is fixedly connected to one side of the casting box 2. A vibrating sand box 5 is installed inside the casting cavity and communicates with the bottom of the casting cavity. A sand conveying component 3 is fixedly connected to one side of the sand storage box 1, and the output end of the sand conveying component 3 is installed on the cover plate 22. A vibrating screen component 6 is installed on one side of the sand storage box 1, located directly below the vibrating sand box 5. A linkage component 7 is installed on one side of the sand storage box 1, and an agitator 8 is installed on one side of the sand storage box 1. A magnetic suction component 12 is installed in the middle of the inside of the sand storage box 1. The vibrating screen component 6, the linkage component 7, the agitator 8, and the magnetic suction component 12 are connected by a transmission. A back-blowing cleaning device is installed on the negative pressure component 10. The agitator 8 and the backflushing cleaning unit 11 are connected by a transmission. A control panel 4 is fixedly connected to one side of the casting box 2, and a symmetrically mounted refrigeration unit 9 is installed on one side of the sand storage box 1. The control panel 4 is electrically connected to the sand conveying unit 3, the vibrating sand box unit 5, the vibrating screen assembly 6, the refrigeration unit 9, and the negative pressure assembly 10. Here, the observation window 21 is a transparent observation window, through which people can observe the casting condition inside the casting box 2. In addition, by operating the refrigeration unit 9, the sand conveying unit 1 can be regulated. The cold air can cool the sand particles inside the sand storage box 1. The conveying end of the refrigeration unit 9 is equipped with a sand guard to prevent sand particles from entering the refrigeration unit 9 and affecting the delivery of cold air. A pipe for conveying molten metal is connected to one side of the casting box 2. The nozzle of the pipe is located above the vibrating sand box 5. A slag discharge port is provided on one side of the sand storage box 1. The slag discharge port is located at the bottom of the screening inclined end of the vibrating screen assembly 6. The clumps, oversized particles and mixed non-metallic impurities screened by the vibrating screen assembly 6 can be discharged from the slag discharge port.

[0047] When casting metal parts, the cover plate 22 can be opened first, and the foam model can be placed inside the vibrating sand box 5. Then, the cover plate 22 can be closed. Through the operation of the sand conveying component 3, the internal components of the sand conveying component 3 can extract the sand particles from the sand storage box 1 and transport them to the vibrating sand box 5. The internal components of the vibrating sand box 5 can vibrate and compact the sand particles, thus fixing the foam model. During the sand injection, the internal components of the negative pressure component 10 can extract the air inside the casting cavity. Then, the molten metal is transported to the foam model through the external molten metal conveying pipe for injection molding. After the molten metal cools down, the casting of the metal parts can be realized. After casting, the negative pressure component 10 can stop sucking air. Then, the cover plate 22 can be opened again, and the injection-molded metal parts can be taken out, thus completing the casting.

[0048] After a casting is completed, the contraction action of the internal components of the vibrating sand box 5 is precisely coordinated with the falling path of the sand particles, allowing the cast sand particles to fall naturally into the sand storage box 1 below. During this falling process, the sand particles are forced to pass through the vibrating screen assembly 6. The vibrating screen assembly 6 uses the high-frequency vibration of its internal components to efficiently remove clumps, oversized particles, and mixed non-metallic impurities from the sand particles caused by casting. The pre-cleaned sand particles are directly stored in the sand storage box 1 for temporary storage, waiting to be extracted and transported again by the subsequent sand conveying component 3, preparing for the next sand injection and reducing the generation of sand hole defects from the source.

[0049] Secondly, at the moment the vibrating screen assembly 6 starts operating, its power output simultaneously drives the linkage assembly 7 to start. The linkage assembly 7 drives the agitator 8 in the sand storage box 1 to rotate at high speed through the transmission structure. The agitator 8 agitates the sand particles after initial cleaning in all directions, so that the sand particles are fully dispersed. At the same time, the refrigeration unit 9 and the agitator 8 work together. The dispersed sand particles come into full contact with the cold energy output by the refrigeration unit 9, quickly removing the heat adsorbed during the casting process and reducing the sand particle temperature to a safe range suitable for the foam model. This prevents the high-temperature sand particles from damaging the foam model during subsequent sand injection. While driving the agitator 8, the linkage assembly 7 drives the magnetic suction assembly 12 to reciprocate inside the sand storage box 1 through the branch transmission, performing a second precise removal of impurities from the sand particles after initial cleaning by the vibrating screen. This completely adsorbs and removes the residual metal debris in the sand particles, achieving double purification of the sand particles and further improving the purity of the sand particles.

[0050] During the continuous operation of the agitator 8, its internal structure simultaneously triggers the linkage process of backflushing cleaning and negative pressure stabilization. When the agitator 8 operates, it drives the internal components of the backflushing cleaning component 11 to rotate, generating a continuous and stable airflow. This airflow is directly delivered to the inside of the negative pressure assembly 10 through the internal components of the backflushing cleaning component 11. Since the negative pressure assembly 10 needs to maintain a vacuum environment in the casting cavity during the casting process, it is prone to sucking in fine sand particles and causing blockage. The airflow generated by the backflushing cleaning component 11 can perform air-blowing cleaning of the air passage of the negative pressure assembly 10, thoroughly blowing out the attached or accumulated sand particles and ensuring that the air passage of the negative pressure assembly 10 is unobstructed. This agitation and backflushing linkage mechanism effectively maintains the vacuum stability of the negative pressure assembly 10, avoids insufficient compaction of dry sand due to a sudden drop in vacuum, and thus prevents the sand mold from collapsing when the molten metal is filled.

[0051] After the sand particles have been processed inside the sand storage box 1, the control panel 4 can re-close the vibrating sand box component 5. Then, the control panel 4 controls the vibrating screen component 6 to stop running, so that the vibrating screen component 6, linkage component 7, agitator 8, back-blowing cleaning component 11 and magnetic suction component 12 stop running synchronously. People can put the foam model into the vibrating sand box component 5 again and turn on the negative pressure component 10 to create a vacuum negative pressure. Sand is injected again through the sand conveying component 3, and casting is carried out again.

[0052] Reference Figure 3The sand conveying component 3 includes a sand pump 31 fixedly connected to one side of the sand storage tank 1. The output end of the sand pump 31 is fixedly connected to a conveying pipe 32. One end of the conveying pipe 32 is fixedly connected to a conveying hose 33. One end of the conveying hose 33 is fixedly connected to a connecting nozzle 34. The connecting nozzle 34 is installed on the cover plate 22. Here, the conveying pipe 32, the conveying hose 33 and the connecting nozzle 34 are all detachably connected by a connector. When it is necessary to process the sand particles inside the sand conveying component 3, the connector can be manually removed to separate the conveying pipe 32, the conveying hose 33 and the connecting nozzle 34.

[0053] By operating the sand pump 31, the sand particles inside the sand storage box 1 can be extracted and transported to the conveying hose 33 through the conveying pipe 32. The sand particles are then injected into the vibrating sand box 5 through the connecting nozzle 34, thereby realizing the sand injection treatment of the vibrating sand box 5.

[0054] Reference Figure 4 The vibrating sand box component 5 includes a vibrating seat 51 symmetrically and fixedly connected inside the casting cavity. A connecting plate 52 is installed on one side of the vibrating seat 51, and a sand box 53 is placed on the vibrating seat 51. An electric sealing plate 54 is installed at the bottom of the sand box 53, and a sand discharge cylinder 56 is fixedly connected to the bottom of the sand box 53. A flow port is opened at the top of the sand storage box 1, and the sand discharge cylinder 56 is inserted into the flow port. The sand box 53 and the connecting plate 52 are fixed together by multiple positioning pins 55. The electric sealing plate 54 is slidably installed at the bottom of the sand box 53. By extending and retracting the sand box 53, the bottom of the sand box 53 can be closed and opened. The outer side of the sand discharge cylinder 56 is wrapped with a rubber coating, which forms a seal when inserted into the flow port, and will not affect the negative pressure inside the casting cavity. When the electric sealing plate 54 is opened, the sand particles poured into the sand box 53 can enter the sand storage box 1 through the sand discharge cylinder 56 to realize the sand filtration and sand replacement work. In addition, when it is necessary to replace or disassemble the sand box 53, the sand box 53 can be disassembled and replaced by removing the positioning pin 55.

[0055] After casting is completed, the operation of the two electric sealing plates 54 causes them to move towards the bottom inside of the sand box 53, thus completing the shrinkage and releasing the seal on the sand discharge cylinder 56. This allows the sand particles inside the sand box 53 to be discharged from the sand discharge cylinder 56 and fall naturally into the sand storage box 1, where they come into contact with the vibrating screen assembly 6. When casting is performed again, the electric sealing plates 54 extend and seal the sand discharge cylinder 56. During sand injection, the operation of the vibrating seat 51 generates vibration force, which is transmitted to the sand box 53 to vibrate and compact the sand particles inside the sand box 53.

[0056] Reference Figure 5 and 7A sand guide slope 13 is provided on one side of the interior of the sand storage box 1. The vibrating screen assembly 6 includes multiple elastic telescopic rods 62 fixedly connected to the top of the sand storage box 1. One end of the elastic telescopic rod 62 is fixedly connected to a screen plate 61. The screen plate 61 is inclined. An impact component is installed on one side of the interior of the sand storage box 1. The screen plate 61 is located directly below the flow port. Here, the elastic telescopic rod 62 is composed of a sleeve rod, an inner rod, and a spring, which can support and guide the movement of the screen plate 61. At the same time, the spring elasticity can increase the vibration frequency of the screen plate 61. The sand guide slope 13 can be used to guide the sand particles of the initial screening so that the sand particles can move towards the magnetic suction assembly 12 and the stirring component 8. The impact component includes a servo motor 63 fixedly connected to one side of the sand storage box 1. The output end of the servo motor 63 is fixedly connected to a rotating rod 64. Symmetrical protrusions 65 are fixedly connected to the rotating rod 64. The protrusions 65 are located below the screen plate 61.

[0057] Under the operation of the servo motor 63, the rotating rod 64 can be driven to rotate. The rotating rod 64 can drive the protrusion 65, causing the protrusion 65 to rotate, which in turn intermittently strikes the bottom two ends of the screen plate 61, causing the screen plate 61 to vibrate, thereby vibrating and screening the sand particles. The clumps, oversized particles and mixed non-metallic impurities after screening can move naturally along the inclined direction of the screen plate 61 and be discharged from the slag discharge port, thus vibrating and screening the sand particles.

[0058] Reference Figure 6 and Figure 9 The linkage component 7 includes a connecting box 71 fixedly connected to one side of the sand storage tank 1. A transmission rod 72 is rotatably connected inside the connecting box 71. A bevel gear 73 is fixedly connected to the top of the transmission rod 72, and a driven disc 78 is fixedly connected to the bottom of the transmission rod 72. A transmission disc 75 is rotatably connected to one side of the connecting box 71. A bevel gear 74 is fixedly connected to one side of the transmission disc 75. The bevel gear 73 and the bevel gear 74 are meshed. A transmission disc 77 is fixedly connected to one end of the rotating rod 64. The transmission disc 75 and the transmission disc 77 are connected by a transmission belt 76. A driven disc 711 is rotatably connected to one side of the bottom of the sand storage tank 1. The driven disc 78 and the driven disc 711 are connected by a transmission belt 710. A linkage disc 79 is fixedly connected to the bottom of the driven disc 78.

[0059] When the rotating rod 64 rotates, it can drive the second transmission disk 77 to rotate. The rotating transmission disk 77 can drive the first transmission disk 75 to rotate through the first transmission belt 76, so that the first transmission disk 75 drives the second bevel gear 74 to rotate and engages with the first bevel gear 73, so that the first bevel gear 73 drives the transmission rod 72 to rotate, thereby driving the driven disk 78 to rotate. The rotating driven disk 78 can drive the first linkage disk 79 to rotate synchronously. When the driven disk 78 rotates, it can drive the second driven disk 711 to rotate through the second transmission belt 710. The rotating driven disk 711 can drive the agitator 8. In addition, the rotating linkage disk 79 can drive the magnetic suction assembly 12 through the third transmission belt 712.

[0060] Reference Figure 7 and Figure 9 The agitator 8 includes a turntable 81 rotatably connected to one side inside the sand storage tank 1. A plurality of agitating rods 82 are fixedly connected to the top of the turntable 81, and a turntable 83 is fixedly connected to the top of the agitating rods 82. The bottom of the turntable 81 is fixedly connected to the driven plate 711. Here, the surface of the agitating rods 82 is coated with a friction-resistant coating to reduce wear caused by agitating the sand particles.

[0061] When the driven disk 2 711 rotates, it can drive the turntable 1 81 to rotate, which in turn drives multiple stirring rods 82 to rotate around the axis of the turntable 1 81. The rotating stirring rods 82 can agitate the sand particles. In addition, when the stirring rods 82 rotate, they can drive the turntable 2 83 to rotate and drive the back-blowing cleaning component 11.

[0062] Reference Figure 8 and Figure 9The magnetic attraction component 12 includes a connecting box 122 fixedly connected to one side of the sand storage box 1. A collection box 121 is fixedly connected to one end of the connecting box 122. Both the sand storage box 1 and the connecting box 122 are rotatably connected to drive rollers 124. Conveyor belts 125 are driven to both ends of the drive rollers 124. Multiple electromagnetic suction rods 126 are fixedly connected between the two conveyor belts 125. A second linkage disc 127 is fixedly connected to the bottom end of the drive roller 124 located inside the connecting box 122. The second linkage disc 127 is driven to the first linkage disc 79 via a third transmission belt 712. A controller 129 is fixedly connected to the top of the connecting box 122, and a slag guide slope 128 is provided at the bottom of the connecting box 122. A cleaning brush 123 is fixedly connected to the middle of the collection box 121. The controller 129 integrates a control chip and a sensing chip. The control chip controls the opening and closing of the electromagnetic suction rods 126, while the sensing chip senses the position of the electromagnetic suction rods 126 to coordinate with... The control chip controls the start and stop of the electromagnetic suction rod 126. When the electromagnetic suction rod 126 enters the connection box 122, the controller 129 can close the electromagnetic suction rod 126 that has entered the connection box 122. When the electromagnetic suction rod 126 comes out of the connection box 122, the controller 129 can reopen the electromagnetic suction rod 126. In addition, a closed cover is provided on one side of the collection box 121. When it is necessary to clean the fine metal shavings inside the collection box 121, the closed cover can be opened to facilitate cleaning. There are two inlets and outlets on one side of the connection box 122. The electromagnetic suction rod 126 can enter and exit the connection box 122 through the inlets and outlets. There are elastic sealing plates at the inlets and outlets. When the electromagnetic suction rod 126 enters the inlet and outlet, it can squeeze the elastic sealing plate and deform it to force the electromagnetic suction rod 126 to enter and exit the connection box 122. After the electromagnetic suction rod 126 passes, the elastic sealing plate can reset again to seal the inlet and outlet, reducing the seepage of sand particles into the sand storage box 1.

[0063] The rotating linkage disc 79 can drive the linkage disc 127 via the transmission belt 712, causing the linkage disc 127 to rotate. The rotating linkage disc 127 can drive the drive roller 124 on one side to rotate, and the rotating drive roller 124 can drive the conveyor belt 125 to move, thereby driving multiple electromagnetic suction rods 126 to move back and forth. The electromagnetic suction rods 126 can attract metal debris in the sand and move it into the connecting box 122. After the electromagnetic suction rods 126 enter the connecting box 122, the controller 129 can shut them off to demagnetize them, and the metal debris can fall naturally. The cleaning brush 123 can then clean the surface of the electromagnetic suction rods 126 to further clean the attracted metal debris. During this process, the guide slope 128 guides the metal debris to slide into the collection box 121, thereby cleaning the metal debris in the sand.

[0064] Reference Figure 10 The negative pressure assembly 10 includes a negative pressure machine 101 fixedly connected inside the isolation chamber 23. An electric air valve 102 is fixedly connected to the suction end of the negative pressure machine 101. An air passage 103 is fixedly connected to one side of the electric air valve 102. An air suction pipe 104 is fixedly connected to one end of the air passage 103. Multiple air suction ports 105 are fixedly connected to the air suction pipe 104, and the air suction pipe 104 is located inside the casting chamber. The back-blowing cleaning component 11 includes a blower 111 fixedly connected inside the isolation chamber 23. An electric air valve 112 is fixedly connected to the top of the blower 111. The electric air valve 112 communicates with the air passage 103. A linkage rod 113 is rotatably connected inside the blower 111. A fan blade 114 is fixedly connected to one end of the linkage rod 113. The linkage rod 113 is fixedly connected to the turntable 83.

[0065] When applying vacuum pressure to the casting cavity, electric air valve 102 can be opened, and the negative pressure machine 101 will operate to evacuate air from the ventilation channel 103 and the casting cavity through the suction pipe 104 and suction port 105, creating a negative pressure inside the casting cavity to facilitate subsequent sand and liquid injection during casting. During the suction period, electric air valve 112 is completely closed. When casting is completed and the vibrating sand box 5 is opened for sand discharge, the negative pressure machine 101 stops operating, and electric air valve 102 closes. At this time, electric air valve 112... When 12 is turned on, the rotation of turntable 83 drives the linkage rod 113 to rotate. The rotating linkage rod 113 drives the fan blade 114 to rotate, so that air force is generated inside the blower 111. The air is blown into the ventilation channel 103 through the electric air valve 112, thereby back-blowing and cleaning the ventilation channel 103, the suction pipe 104 and the suction port 105, and thoroughly blowing out the attached or accumulated sand particles, ensuring that the air passage of the negative pressure component 10 is unobstructed. When casting is performed again, the electric air valve 112 closes again, and the electric air valve 102 opens again.

[0066] Working principle: When casting metal parts, the cover plate 22 can be opened first, and the foam model can be placed inside the vibrating sand box 5. Then, the cover plate 22 is closed. By operating the sand pump 31, the sand particles inside the sand storage box 1 can be extracted and transported to the material conveying hose 33 through the conveying pipe 32. The sand particles are then injected into the vibrating sand box 5 through the connecting nozzle 34. The internal components of the vibrating sand box 5 vibrate and compact the sand particles, thus fixing the foam model. During the sand injection, the internal components of the negative pressure component 10 can extract the air inside the casting chamber. Then, the molten metal is transported to the foam model through the external molten metal conveying pipe for injection molding. After the molten metal cools down, the casting of the metal parts is achieved. After casting, the negative pressure component 10 can stop sucking air. Then, the cover plate 22 can be opened again, and the injection-molded metal parts can be taken out, thus completing the casting.

[0067] After a casting is completed, the contraction action of the internal components of the vibrating sand box 5 is precisely coordinated with the falling path of the sand particles, allowing the cast sand particles to fall naturally into the sand storage box 1 below. During this falling process, the sand particles are forced to pass through the vibrating screen assembly 6. The vibrating screen assembly 6 uses the high-frequency vibration of its internal components to efficiently remove clumps, oversized particles, and mixed non-metallic impurities from the sand particles caused by casting. The pre-cleaned sand particles are directly stored in the sand storage box 1 for temporary storage, waiting to be extracted and transported again by the subsequent sand conveying component 3, preparing for the next sand injection and reducing the generation of sand hole defects from the source.

[0068] Secondly, at the moment the vibrating screen assembly 6 starts operating, its power output simultaneously drives the linkage assembly 7 to start. The linkage assembly 7 drives the agitator 8 in the sand storage box 1 to rotate at high speed through the transmission structure. The agitator 8 agitates the sand particles after initial cleaning in all directions, so that the sand particles are fully dispersed. At the same time, the refrigeration unit 9 and the agitator 8 work together. The dispersed sand particles come into full contact with the cold energy output by the refrigeration unit 9, quickly removing the heat adsorbed during the casting process and reducing the sand particle temperature to a safe range suitable for the foam model. This prevents the high-temperature sand particles from damaging the foam model during subsequent sand injection. While driving the agitator 8, the linkage assembly 7 drives the magnetic suction assembly 12 to reciprocate inside the sand storage box 1 through the branch transmission, performing a second precise removal of impurities from the sand particles after initial cleaning by the vibrating screen. This completely adsorbs and removes the residual metal debris in the sand particles, achieving double purification of the sand particles and further improving the purity of the sand particles.

[0069] During the continuous operation of the agitator 8, its internal structure simultaneously triggers the linkage process of backflushing cleaning and negative pressure stabilization. When the agitator 8 operates, it drives the internal components of the backflushing cleaning component 11 to rotate, generating a continuous and stable airflow. This airflow is directly delivered to the inside of the negative pressure assembly 10 through the internal components of the backflushing cleaning component 11. Since the negative pressure assembly 10 needs to maintain a vacuum environment in the casting cavity during the casting process, it is prone to sucking in fine sand particles and causing blockage. The airflow generated by the backflushing cleaning component 11 can perform air-blowing cleaning of the air passage of the negative pressure assembly 10, thoroughly blowing out the attached or accumulated sand particles and ensuring that the air passage of the negative pressure assembly 10 is unobstructed. This agitation and backflushing linkage mechanism effectively maintains the vacuum stability of the negative pressure assembly 10, avoids insufficient compaction of dry sand due to a sudden drop in vacuum, and thus prevents the sand mold from collapsing when the molten metal is filled.

[0070] After the sand particles have been processed inside the sand storage box 1, the control panel 4 can re-close the vibrating sand box component 5. Then, the control panel 4 controls the vibrating screen component 6 to stop running, so that the vibrating screen component 6, linkage component 7, agitator 8, back-blowing cleaning component 11 and magnetic suction component 12 stop running synchronously. People can put the foam model into the vibrating sand box component 5 again and turn on the negative pressure component 10 to create a vacuum negative pressure. Sand is injected again through the sand conveying component 3, and casting is carried out again.

Claims

1. A lost foam casting machine, comprising a sand storage tank (1), characterized in that: The top of the sand storage box (1) is fixedly connected to the casting box (2). An isolation cavity (23) is provided on one side of the inside of the casting box (2). A negative pressure component (10) is installed inside the isolation cavity (23). A casting cavity is provided on the other side of the casting box (2). A cover plate (22) is rotatably connected to the top side of the casting box (2). An observation window (21) is fixedly connected to one side of the casting box (2). A vibrating sand box component (5) is installed inside the casting cavity. The vibrating sand box component (5) is connected to the bottom of the casting cavity. A sand conveying component (3) is fixedly connected to one side of the sand storage box (1). The output end of the sand conveying component (3) is installed on the cover plate (22). A vibrating screen component (6) is installed on one side of the inside of the sand storage box (1). The vibrating screen component (6) is located on the vibrating sand box component (5). Directly below the sand storage box (1), a linkage component (7) is installed on one side of the sand storage box (1), and an agitator (8) is installed on one side of the inside of the sand storage box (1). A magnetic suction component (12) is installed in the middle of the inside of the sand storage box (1). The vibrating screen component (6), linkage component (7), agitator (8) and magnetic suction component (12) are connected by transmission. A back-blowing cleaning component (11) is installed on the negative pressure component (10). The agitator (8) and back-blowing cleaning component (11) are connected by transmission. A control panel (4) is fixedly connected to one side of the casting box (2). A symmetrical refrigerator (9) is installed on one side of the sand storage box (1). The control panel (4) is electrically connected to the sand conveying component (3), vibrating sand box component (5), vibrating screen component (6), refrigerator (9) and negative pressure component (10).

2. The lost foam casting machine according to claim 1, characterized in that: The sand conveying component (3) includes a sand pump (31) fixedly connected to one side of the sand storage box (1). The output end of the sand pump (31) is fixedly connected to a conveying pipe (32). One end of the conveying pipe (32) is fixedly connected to a material conveying hose (33). One end of the material conveying hose (33) is fixedly connected to a connecting nozzle (34). The connecting nozzle (34) is installed on the cover plate (22).

3. A lost foam casting machine according to claim 12, characterized in that: The vibrating sand box component (5) includes a vibrating seat (51) symmetrically fixedly connected inside the casting cavity. A connecting plate (52) is installed on one side of the vibrating seat (51), and a sand box (53) is placed on the vibrating seat (51). An electric sealing plate (54) is installed at the bottom of the sand box (53), and a sand discharge cylinder (56) is fixedly connected to the bottom of the sand box (53). A flow port is opened at the top of the sand storage box (1), and the sand discharge cylinder (56) is inserted into the flow port. The sand box (53) and the connecting plate (52) are fixed together by multiple positioning pins (55).

4. The lost foam casting machine according to claim 1, characterized in that: The sand storage box (1) has a sand guide slope (13) on one side inside. The vibrating screen assembly (6) includes multiple elastic telescopic rods (62) fixedly connected to the top of the sand storage box (1). One end of the elastic telescopic rod (62) is fixedly connected to a screen plate (61). The screen plate (61) is inclined. A striking element is installed on one side inside the sand storage box (1). The screen plate (61) is located directly below the flow port.

5. A lost foam casting machine according to claim 4, characterized in that: The striking component includes a servo motor (63) fixedly connected to one side of the sand storage box (1). The output end of the servo motor (63) is fixedly connected to a rotating rod (64). Symmetrical protrusions (65) are fixedly connected to the rotating rod (64). The protrusions (65) are located below the screen plate (61).

6. A lost foam casting machine according to claim 5, characterized in that: The linkage assembly (7) includes a connecting box (71) fixedly connected to one side of the sand storage box (1). A transmission rod (72) is rotatably connected inside the connecting box (71). A bevel gear (73) is fixedly connected to the top end of the transmission rod (72), and a driven disc (78) is fixedly connected to the bottom end of the transmission rod (72). A transmission disc (75) is rotatably connected to one side of the connecting box (71), and a bevel gear (74) is fixedly connected to one side of the transmission disc (75). 73) meshes with bevel gear two (74), one end of the rotating rod (64) is fixedly connected to transmission disc two (77), transmission disc one (75) and transmission disc two (77) are connected by transmission belt one (76), the bottom side of the sand storage box (1) is rotatably connected to driven disc two (711), driven disc one (78) and driven disc two (711) are connected by transmission belt two (710), and the bottom of driven disc one (78) is fixedly connected to linkage disc one (79).

7. A lost foam casting machine according to claim 6, characterized in that: The agitator (8) includes a turntable (81) rotatably connected to one side inside the sand storage tank (1). A plurality of agitating rods (82) are fixedly connected to the top of the turntable (81), and a turntable (83) is fixedly connected to the top of the agitating rods (82). The bottom of the turntable (81) is fixedly connected to the driven plate (711).

8. A lost foam casting machine according to claim 6, characterized in that: The magnetic suction assembly (12) includes a connecting box (122) fixedly connected to one side of the sand storage box (1). A collection box (121) is fixedly connected to one end of the connecting box (122). A drive roller (124) is rotatably connected inside both the sand storage box (1) and the connecting box (122). A conveyor belt (125) is driven to both ends of the drive roller (124). A plurality of electromagnetic suction rods (126) are fixedly connected between the two conveyor belts (125). A linkage disk two (127) is fixedly connected to the bottom end of the drive roller (124) located inside the connecting box (122). The linkage disk two (127) and the linkage disk one (79) are driven to be connected by a transmission belt three (712). A controller (129) is fixedly connected to the top of the connecting box (122). A slag guide slope (128) is provided at the bottom of the connecting box (122). A cleaning brush (123) is fixedly connected to the middle of the inside of the collection box (121).

9. A lost foam casting machine according to claim 7, characterized in that: The negative pressure assembly (10) includes a negative pressure machine (101) fixedly connected inside the isolation chamber (23). An electric air valve (102) is fixedly connected to the air extraction end of the negative pressure machine (101). An air passage (103) is fixedly connected to one side of the electric air valve (102). An air suction pipe (104) is fixedly connected to one end of the air passage (103). Multiple air suction ports (105) are fixedly connected to the air suction pipe (104), and the air suction pipe (104) is located inside the casting chamber.

10. A lost foam casting machine according to claim 9, characterized in that: The back-blowing cleaning component (11) includes a blower (111) fixedly connected inside the isolation chamber (23). An electric air valve (112) is fixedly connected to the top of the blower (111). The electric air valve (112) is connected to the air passage (103). A linkage rod (113) is rotatably connected inside the blower (111). A fan blade (114) is fixedly connected to one end of the linkage rod (113). The linkage rod (113) is fixedly connected to the turntable (83).

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