Lost foam casting equipment

Abstract

The lost foam casting equipment comprises a functional box and a collecting box which communicate with each other, the collecting box is located below the functional box, a grid supporting plate is arranged between the collecting box and the functional box, and the collecting box is slidably connected with a base in the horizontal direction; a vibration assembly used for driving the collecting box and the functional box to reciprocate in the horizontal direction is arranged on the base, a first supporting plate used for containing a sand mold is arranged in the functional box, the first supporting plate is slidably connected with the functional box in the vertical direction, and a box plate is arranged on the box wall of the functional box. According to the lost foam casting equipment, the processes of mold placing, sand filling, pouring and sand shakeout of lost foam casting can be achieved, the first supporting plate and the box plate in the functional box can be combined to form a sand box, the sand box can implement the steps of mold placing, sand filling and sealing shaping, a sand mold is obtained, and after pouring is completed, the first supporting plate is separated from the box plate; and the sand mold on the first supporting plate can be moved to the bottom of the function box for vibration shakeout, and integrated casting is achieved.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and more particularly to a lost foam casting apparatus. Background Technology

[0002] Lost foam casting (also known as solid casting) is an advanced near-net-shape forming process that uses foamed plastic molds that perfectly match the shape of the casting, replacing traditional wooden or metal molds. Before pouring, the mold is not removed; it is directly filled into the sand box after the coated sand has been vibrated and molded. During pouring, the high-temperature molten metal rapidly vaporizes the mold and fills its cavities, ultimately forming the casting. This process currently often employs a step-by-step production method, with core processes such as sand filling, pouring, and sand removal typically requiring different equipment or workstations. This layout is particularly disadvantageous for small-batch, multi-variety production, as each batch needs to move between multiple workstations, resulting in low sand mold operating efficiency, a large production line footprint, and the need for dedicated equipment for multiple independent stages. This also leads to high equipment investment, high overall energy consumption, and increased unit costs for small-scale production. Summary of the Invention

[0003] This invention addresses the problem of high costs associated with the step-by-step production of small-batch lost foam casting products in existing technologies by proposing a lost foam casting equipment that integrates the sand filling, pouring, and sand removal processes into a single piece of equipment, saving space and operating costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A lost foam casting device includes a functional box and a collection box that are interconnected. The collection box is located below the functional box. A grid support plate is provided between the collection box and the functional box. The collection box is slidably connected to a base in the horizontal direction. A vibration component is provided on the base for driving the collection box and the functional box to reciprocate in the horizontal direction.

[0005] The aforementioned functional box contains a first support plate for placing the sand mold. The first support plate is slidably connected to the functional box in the vertical direction. Box panels are installed on the walls of the functional box. A second support plate rotates below the first support plate. The first support plate has a first discharge hole, and the second support plate has a second discharge hole. When the first support plate is at its upper limit position, the four box panels and the first support plate combine to form a sand box, and the second discharge hole is offset from the first discharge hole, creating a sealed state for the first discharge hole. When the first support plate is at its lower limit position, the four box panels separate, and the second discharge hole connects with the first discharge hole, creating an open state for the first discharge hole.

[0006] Preferably, a connecting rod is coaxially fixedly connected to the lower part of the second support plate, and a first sleeve is fixedly installed inside the collection box. The first sleeve is coaxially arranged with the connecting rod, and the lower end of the connecting rod is sleeved inside the first sleeve. The lower end of the connecting rod is provided with an external thread, and the inside of the first sleeve is provided with an internal thread that matches the external thread. The external thread moves axially relative to the internal thread to form the rotation action of the connecting rod.

[0007] Preferably, a support rod is connected to the lower part of the first support plate, and a limiting plate is connected to the lower end of the support rod. The limiting plate is located inside the collection box.

[0008] Preferably, a movable rod is fixedly connected to the lower part of the limiting plate, and the lower end of the movable rod extends out of the collection box and is rotatably connected to a first limiting block; a slide is fixedly connected to the lower part of the collection box, and two first limiting grooves arranged vertically are provided on the side of the slide. The first limiting block is inserted into the first limiting groove to form a vertical limitation of the first support plate.

[0009] Preferably, the vibration assembly includes a fixed seat, an elastic element, a push plate, a connecting plate, and a combined cam. The fixed seat is located on one side of the collection box, the elastic element is connected between the fixed seat and the collection box, and the push plate is fixedly connected to the other side of the collection box through the connecting plate. The push plate contacts the cam in the combined cam, and the cam rotates to push the collection box to reciprocate in the horizontal direction to form vibration.

[0010] Preferably, the connecting plate is provided with a second limiting groove, and the base is provided with a second limiting block for limiting the displacement of the connecting plate.

[0011] Preferably, the combined cam includes a first cam, a second cam, and a second sleeve arranged coaxially, with the second sleeve connected between the first cam and the second cam. The long end of the first cam and the short end of the second cam are located on the same side, and the endpoints of the long end of the first cam and the short end of the second cam coincide axially.

[0012] Preferably, a second rotating shaft is rotatably connected to the base, and the combined cam is slidably sleeved on the second rotating shaft via a spline. The combined cam adjusts the contact state between the first cam or the second cam and the push plate by moving axially along the second rotating shaft.

[0013] Preferably, the top of the functional box is provided with a cover plate, and the lower part of the cover plate is connected to a pressure plate, which matches the sand box.

[0014] Preferably, the lost foam casting equipment also includes a gas guide pipe, which is connected to the interior of the functional box. A flexible hose is installed inside the functional box to connect the gas guide pipe and the sand box.

[0015] The beneficial effects of this invention are: This lost foam casting equipment is used to realize the processes of mold placement, sand filling, pouring, and sand removal in lost foam casting. The first support plate inside the functional box combines with the box plate to form a sand box. The sand box allows for the placement of the model, sand filling, and sealing to obtain the sand mold. After pouring, the first support plate separates from the box plate, and the first support plate and the sand mold on it can be moved to the bottom of the functional box to achieve vibration-induced sand removal of the casting inside the sand mold. After sand removal, the casting can be directly obtained inside the functional box, achieving integrated casting. The sand filling, pouring, and sand removal processes of lost foam casting can be performed in a single piece of equipment, saving space and operating costs. The functional box of this lost foam casting equipment is vibratory, used for vibration-induced material removal and auxiliary sand filling. By setting a combination of cams, the functional box has different vibration modes. When vibration-induced material removal is performed, the second cam contacts the push plate, and the functional box vibrates with a larger amplitude to match the sand removal vibration requirements; when sand filling is performed, only the first cam contacts the push plate, and the functional box vibrates with a smaller amplitude to match the micro-vibration requirements of the sand particles. Attached Figure Description Figure 1 This is a schematic diagram of the structure of the lost foam casting equipment; Figure 2 This is a structural schematic diagram of the cross-section (during molding) of the lost foam casting equipment; Figure 3 This is a structural schematic diagram of the cross-section at point AA of the lost foam casting equipment; Figure 4 This is a structural schematic diagram of the cross-section at point BB of the lost foam casting equipment; Figure 5 This is a structural schematic diagram of the cross-section of the lost foam casting equipment (during sand removal); Figure 6 This is a structural diagram of the adjustment box (during molding) of the lost foam casting equipment; Figure 7 This is a schematic diagram of the structure of the adjustment box (during sand removal) of the lost foam casting equipment; Figure 8 This is a schematic diagram of the combined cam structure of the lost foam casting equipment; Figure 9 This is a schematic diagram of the front structure of the first cam in this lost foam casting equipment; Figure 10 This is a schematic diagram of the structure of the first limiting groove of the lost foam casting equipment; Figure 11 This is a schematic diagram of the overall structure of the lost foam casting equipment; Figure 12 This is a schematic diagram of the overall cross-section of the lost foam casting equipment.

[0016] In the diagram: 1. Functional box; 2. First support plate; 3. Second support plate; 4. Box plate; 5. Connecting rod; 6. First sleeve; 7. Collection box; 8. Combined cam; 9. Cover plate; 10. Motor; 11. Adjustment box; 12. Movable rod; 13. Limiting plate; 14. Support rod; 15. Air guide pipe; 16. Second rotating shaft; 17. Second functional cylinder; 18. First gear; 19. Second gear; 20. Toothed belt; 21. Base; 22. Push plate; 23. Connecting plate; 24. Third functional cylinder; 25. Slide; 26. First functional cylinder; 27. Sliding seat; 28. Support frame; 101. Spiral seat; 102. First grid support plate; 201. First discharge hole; 31. Second discharge hole; 41. Threaded rod; 42. Handle; 43. Guide rod; 51. External thread; 61. Internal thread; 71. Second grid support plate; 72. Discharge pipe; 81. First cam; 82. Second cam; 83. Second sleeve; 811. Long end; 821. Short end; 91. Pressure plate; 121. First limiting block; 122. Rubber sleeve; 151. Filter; 152. Hose; 171. Second limiting block; 181. First rotating shaft; 211. Fixed seat; 212. Elastic element; 231. Second limiting groove; 241. First connecting ring body; 242. Connecting rod; 243. Second connecting ring body; 251. First limiting groove; 252. Insert rod. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Reference Figure 1-2 A lost foam casting device includes a base 21, on which a functional box 1 and a collection box 7 are disposed. The functional box 1 is located above the collection box 7 and is fixedly connected and communicates with the collection box 7. The collection box 7 is slidably connected to the base 21 in the horizontal direction. A vibration component is disposed on the base 21 to drive the collection box 7 and the functional box 1 to reciprocate in the horizontal direction to generate vibration.

[0019] refer to Figure 2 and Figure 6The aforementioned vibration assembly includes a fixed base 211, an elastic element 212, a push plate 22, a connecting plate 23, and a combined cam 8. The fixed base 211 and the connecting plate 23 are located on different sides of the collection box 7. The fixed base 211 is located on one side of the collection box 7, and the elastic element 212 connects the fixed base 211 and the collection box 7. The connecting plate 23 is located on the other side of the collection box 7, and the collection box 7 is fixedly connected to the push plate 22 via the connecting plate 23. A combined cam 8 is provided on the side of the push plate 22 away from the collection box 7. The cam in the combined cam 8 contacts the push plate 22, and the cam can rotate to push the collection box 7 to reciprocate horizontally.

[0020] In this embodiment, a second functional cylinder 17 is provided on the base 21, and the axis of the second functional cylinder 17 is vertically arranged. The lower end of the second functional cylinder 17 is fixedly connected to the base 21, and the upper end of the second functional cylinder 17 is the working end, which extends from the upper surface of the base 21. A second limiting block 171 is fixedly connected to the working end of the second functional cylinder 17, and the second functional cylinder 17 can drive the second limiting block 171 to move. A second limiting groove 231 is provided on the connecting plate 23. When the functional box 1 is in the original position, the position of the second limiting groove 231 on the connecting plate 23 corresponds to the position of the second limiting block 171. The second limiting block 171 can enter the second limiting groove 231 on the connecting plate 23, restricting the horizontal displacement of the connecting plate 23, the functional box 1, and the collection box 7, thereby achieving the positioning of the functional box 1 and the collection box 7 on the base 21.

[0021] Furthermore, a motor 10 is mounted on the base 21. The output shaft of the motor 10 is connected to a first rotating shaft 181 via a coupling. The first rotating shaft 181 is rotatably connected to the base 21, and a first gear 18 is fixedly sleeved on the first rotating shaft 181. A second rotating shaft 16 is also rotatably connected to the base 21, and a second gear 19 is fixedly sleeved on the second rotating shaft 16. The second gear 19 is connected to the first gear 18 via a toothed belt 20, enabling the second gear 19 and the first gear 18 to rotate synchronously. The combined cam 8 is also sleeved on the second rotating shaft 16. The motor 10 can drive the first rotating shaft 181 and the first gear 18 to rotate, and the first gear 18 drives the second gear 19 and the second rotating shaft 16 to rotate, thereby realizing the rotational action of the combined cam 8.

[0022] refer to Figure 8 The combined cam 8 includes a first cam 81, a second cam 82, and a second sleeve 83. The first cam 81, the second cam 82, and the second sleeve 83 are coaxially arranged, and the second sleeve 83 is fixedly connected between the first cam 81 and the second cam 82. (Reference) Figure 9 The long end 811 of the first cam 81 and the short end 821 of the second cam 82 are located on the same side, and the endpoint of the long end 811 of the first cam 81 and the endpoint of the short end 821 of the second cam 82 coincide in the axial direction.

[0023] The aforementioned combined cam 8 is slidably connected to the second rotating shaft 16 via a spline. The combined cam 8 can move axially along the second rotating shaft 16; that is, the first cam 81, the second cam 82, and the second sleeve 83 can move axially along the second rotating shaft 16 to adjust the contact state between the first cam 81 or the second cam 82 and the push plate 22. (Reference) Figure 6 At this time, the first cam 81 is in contact with the push plate 22, while the second cam 82 is not in contact with the push plate 22. Because the first cam 81 is smaller in size, with a smaller difference between its major and minor axes, the first cam 81 can push the push plate 22 to vibrate with a smaller amplitude. (Reference) Figure 7 At this time, the second cam 82 is in contact with the push plate 22, and the first cam 81 is only in intermittent contact with the push plate 22 at its long end 811. The second cam 82 is the main wheel that pushes the push plate 22 to move. Since the second cam 82 is large in size and the difference between its major and minor diameters is large, the first cam 81 can push the push plate 22 to vibrate with a large amplitude.

[0024] It is worth noting that, to ensure smooth movement of the combined cam 8 along the second rotation axis 16, the long end 811 of the first cam 81 or the short end 821 of the second cam 82 must remain in contact with the push plate 22 during axial movement of the combined cam 8. Since the long end 811 of the first cam 81 and the short end 821 of the second cam 82 coincide axially, both the first cam 81 and the second cam 82 have contact points with the push plate 22 in this state, which is beneficial for the movement of the combined cam 8.

[0025] In this embodiment, an adjustment box 11 is provided on the base 21, and the combined cam 8 and push plate 22 are located inside the adjustment box 11. A third functional cylinder 24 is fixedly installed on the adjustment box 11, and the axis of the third functional cylinder 24 is vertically arranged. The upper end of the third functional cylinder 24 is fixedly connected to the adjustment box 11, and the lower end of the third functional cylinder 24 is the working end. The working end of the third functional cylinder 24 extends into the interior of the adjustment box 11 and is fixedly connected to a first connecting ring 241. The first connecting ring 241 is fixedly connected to a second connecting ring 243 through a connecting rod 242. The second connecting ring 243 is coaxially rotatably connected to the second cam 82. The third functional cylinder 24 can drive the second connecting ring 243 to move, thereby realizing the axial movement of the combined cam 8 on the second rotating shaft 16.

[0026] Further reference Figure 2 and Figure 3The functional box 1 contains a first support plate 2 and four box plates 4, which are respectively connected to four different side walls of the functional box 1. Adjacent box plates 4 are arranged vertically. A screw seat 101 and a guide rod 43 are fixedly installed on the side wall of the functional box 1. A threaded rod 41 is provided on the screw seat 101 and is threadedly connected to the screw seat 101. The first end of the threaded rod 41 is located inside the functional box 1 and is rotatably connected to a box plate 4. The second end of the threaded rod 41 is located outside the functional box 1 and is fixedly connected to a handle 42. The guide rod 43 is formed by multiple coaxially arranged sleeves and is telescopic. One end of the guide rod 43 is fixedly connected to a box plate 4, and the other end of the guide rod 43 is fixedly connected to the side wall of the functional box 1. The guide rod 43 is used to guide the box plate 4 during movement and can also limit the rotation of the box plate 4. By rotating the threaded rod 41, the position of the box plate 4 can be adjusted, enabling the combination and separation of the four box plates 4. The four box plates 4 can be combined to form a bottomless and topless frame.

[0027] In this embodiment, reference Figure 2 The first support plate 2 is slidably connected to the functional box 1 in the vertical direction. A support rod 14 is fixedly connected to the lower part of the first support plate 2. A limit plate 13 is connected to the lower end of the support rod 14. The limit plate 13 is located inside the collection box 7. A movable rod 12 is fixedly connected to the lower part of the limit plate 13. The lower end of the movable rod 12 extends from the bottom of the collection box 7. A first limit block 121 is provided at the lower end of the movable rod 12. The first limit block 121 is rotatably connected to the movable rod 12.

[0028] Furthermore, a slide 25 is fixedly connected to the lower part of the collection box 7, and the slide 25 is slidably connected to the base 21 in the horizontal direction. Two first limiting grooves 251 are provided on the side of the slide 25, arranged vertically. The position of the first limiting block 121 matches the first limiting groove 251. One side of the first limiting block 121 is protruding. The first limiting block 121 rotates relative to the movable rod 12, and the protruding part of the movable rod 12 can be inserted into the first limiting groove 251, forming a vertical limitation on the movable rod 12, the limiting plate 13, the support rod 14, and the first support plate 2. (Reference) Figure 2 When the first limiting block 121 is inserted into the upper first limiting groove 251, the first support plate 2 is at its upper limit position; (Reference) Figure 5 When the first limiting block 121 is inserted into the first limiting groove 251 located at the lower part, the first support plate 2 is located at the lower limit position.

[0029] refer to Figure 10In this embodiment, a vertical insertion rod 252 is provided on the slide 25. The insertion rod 252 is threadedly connected to the slide 25. The first limiting block 121 is provided with an insertion hole. The insertion rod 252 can move vertically in the slide 25 by rotation. The insertion rod 252 can be inserted into the insertion hole on the first limiting block 121 by movement, thereby limiting the rotation of the first limiting block 121 and keeping the position of the first support plate 2 stable when the functional box 1 vibrates.

[0030] In this embodiment, a rubber sleeve 122 is provided inside the collection box 7. The rubber sleeve 122 is a rubber telescopic tube. The rubber sleeve 122 extends from the lower end of the limiting plate 13 to the bottom of the collection box 7. The rubber sleeve 122 is fitted over the upper end of the movable rod 12. The rubber sleeve 122 protects the part of the movable rod 12 inside the collection box 7 and reduces the impact of sand particles inside the collection box 7 on the movable rod 12.

[0031] refer to Figure 2 A second support plate 3 is disposed below the first support plate 2. The second support plate 3 is a circular plate and is rotatably connected to the first support plate 2. (Reference) Figure 3 and Figure 4 The first support plate 2 is provided with a first discharge hole 201, which is arranged around the rotation axis of the second support plate 3. The second support plate 3 is provided with a second discharge hole 31, which is arranged around the rotation axis of the second support plate 3.

[0032] The positions of the first discharge hole 201 and the second discharge hole 31 are corresponding. The second support plate 3 can rotate relative to the first support plate 2. When the second discharge hole 31 is misaligned with the first discharge hole 201, the first discharge hole 201 is in a sealed state. When the second discharge hole 31 is connected to the first discharge hole 201, the first discharge hole 201 is in an open state.

[0033] Further reference Figure 2 and Figure 4 A connecting rod 5 is fixedly connected to the lower part of the second support plate 3, and the connecting rod 5 is coaxially arranged with the second support plate 3. A bracket is fixedly installed inside the collection box 7, and a first sleeve 6 is fixedly connected to the bracket, and the first sleeve 6 is coaxially arranged with the connecting rod 5. The lower end of the connecting rod 5 is sleeved inside the first sleeve 6. When the first support plate 2 moves in the vertical direction, the connecting rod 5 can move axially relative to the first sleeve 6.

[0034] The lower end of the aforementioned connecting rod 5 is provided with an external thread 51, and the interior of the first sleeve 6 is provided with an internal thread 61. The internal thread 61 matches the external thread 51, and the internal thread 61 and the external thread 51 form a threaded connection. (Reference) Figure 2 The first support plate 2 is located at its upper limit position, and the second discharge hole 31 is offset from the first discharge hole 201; (Reference) Figure 5 The first support plate 2 is located at its lower limit position, and the second discharge hole 31 is connected to the first discharge hole 201. During the movement of the first support plate 2 from its upper limit position to its lower limit position, the external thread 51 moves axially relative to the internal thread 61, and the connecting rod 5 rotates relative to the first sleeve 6, thereby realizing the rotation of the second support plate 3 relative to the first support plate 2. This rotation is used to adjust the opening and closing state of the first discharge hole 201.

[0035] In this embodiment, the collection box 7 is used to hold sand particles, and a discharge pipe 72 is provided at the bottom of the collection box 7 for discharging sand particles or sand blocks. A first grid support plate 102 is provided at the lower part of the functional box 1, and a second grid support plate 71 is provided at the upper part of the collection box 7. Both the first grid support plate 102 and the second grid support plate 71 are located between the collection box 7 and the functional box 1. The first grid support plate 102 and the second grid support plate 71 are used to support the casting during sand falling, isolating the casting from falling sand blocks and particles. Of course, in actual use, to save materials, either the first grid support plate 102 or the second grid support plate 71 can be installed.

[0036] refer to Figure 2 A through hole is provided in the middle of the first grid support plate 102 and the second grid support plate 71. The position of the through hole corresponds to the position of the first support plate 2, and the support rod 14 passes through the through hole. (Reference) Figure 5 When the first support plate 2 is at the lower limit position, the first support plate 2 covers the through hole.

[0037] refer to Figure 2 When the first support plate 2 is at its upper limit position, the lower surface of the box plate 4 is at the same level as the upper surface of the first support plate 2. The four box plates 4 and the first support plate 2 are combined to form a sand box, which can be used for sand filling and molding.

[0038] In this embodiment, a cover plate 9 is provided on the top of the functional box 1 to seal the top of the functional box 1. A pressure plate 91 is connected to the lower part of the cover plate 9. In this embodiment, the pressure plate 91 and the cover plate 9 are connected by a cylindrical spring (not shown). The pressure plate 91 matches the sand box, and the lower end of the pressure plate 91 can enter the sand box. Under the action of the cylindrical spring, the pressure plate 91 applies pressure to the sand particles inside the sand box to help compact the sand particles.

[0039] refer to Figure 11 and Figure 12To facilitate the removal of the cover plate 9, a support frame 28 can be installed in the workshop. A sliding seat 27 is mounted on the support frame 28, and the sliding seat 27 is slidably connected to the support frame 28. A fourth functional cylinder (not shown) is mounted on the support frame 28 to drive the sliding seat 27. A first functional cylinder 26 is fixedly mounted on the sliding seat 27. The axis of the first functional cylinder 26 is vertically oriented, and its lower end is the working end. A clamp is fixedly mounted on the working end of the first functional cylinder 26, which can drive the clamp to move vertically. A protruding block is provided on the top of the cover plate 9, and the clamp can grasp this protruding block to achieve the gripping of the cover plate 9. The first functional cylinder 26 and the fourth functional cylinder can move the cover plate 9, facilitating its removal from above the functional box 1.

[0040] refer to Figure 2 In this embodiment, the functional box 1 of the lost foam casting equipment is also equipped with a gas guide pipe 15, which is connected to the interior of the functional box 1. A flexible hose 152 is installed inside the functional box 1. One end of the hose 152 is connected to the gas guide pipe 15, and the other end is connected to one of the box plates 4. The hose 152 connects the gas guide pipe 15 and the sand box. The hose 152 is bendable to accommodate the movement of the box plate 4. A mesh is installed at the end of the hose 152 connected to the box plate 4 to isolate sand particles. The aforementioned gas guide pipe 15 is connected to a vacuum pump, which can create a negative pressure state inside the sand box, assisting in the compaction and casting of sand particles. When the sand box is filled with sand, the negative pressure in the sand box can help extract air between the sand particles, making the sand mold more compact. During sand casting, the EPS model undergoes pyrolysis and gasification, generating a large amount of gas inside the sand mold. The negative pressure in the sand box can help extract this gas, reducing its impact on the casting environment.

[0041] A filter 151 can be installed on the base 21. The air inlet of the filter 151 is connected to the exhaust end of the air duct 15, and the exhaust end of the filter 151 is connected to a vacuum pump. The filter 151 filters the gas inside the air duct 15 and intercepts solid impurities in the flue gas.

[0042] In this embodiment, a screw conveyor is provided on one side of the functional box 1. The screw conveyor is used for feeding sand particles. A flexible guide pipe is provided at the discharge port of the screw conveyor. The flexible guide pipe is a rubber tube and can be placed above the functional box 1 for filling sand inside the sand box.

[0043] The working process of the lost foam casting equipment in this embodiment is as follows: Step 1: Using the first and fourth functional cylinders, the cover plate 9 is lifted away from the top of the functional box 1. The position of the first support plate 2 is adjusted using the movable rod 12. (Refer to...) Figure 2The first limiting block 121 is inserted into the first limiting groove 251 at the top of the slide 25, and the first support plate 2 is at the upper limit position. At this time, the second dropping hole 31 is offset from the first dropping hole 201, and the first dropping hole 201 is in a sealed state. Then, rotate the handle 42 to bring the four box plates 4 together, and the four box plates 4 and the first support plate 2 are combined to form a sand box. At the same time, the position of the combined cam 8 is adjusted by the third function cylinder 24, with reference to... Figure 6 At this time, the first cam 81 is kept in contact with the push plate 22, the second cam 82 is not in contact with the push plate 22, the second limiting block 171 at the working end of the second functional cylinder 17 is located inside the second limiting groove 231, and the position of the functional box 1 is fixed. Step 2: Fill the sand box with bottom sand of about 100-200mm thickness. The second functional cylinder 17 drives the second limiting block 171 to leave the second limiting groove 231 and starts the motor 10. The motor 10 can drive the first rotating shaft 181, the first gear 18, the second gear 19 and the second rotating shaft 16 to rotate, realizing the rotation action of the combined cam 8. The first cam 81 can push the push plate 22, the collection box 7 and the functional box 1 to move back and forth in the horizontal direction, realizing the sand box vibrates with a small amplitude. The vibration time is about 20 seconds, which will level the bottom sand. Step 3: Place the EPS model on the leveled bottom sand in the sand box, keeping the opening of the model's cavity facing upwards so that the sand particles can flow in naturally under gravity. Step 4: Slowly add molding sand along the inner wall of the sand box, avoiding direct impact of the sand flow on the weak parts of the model. Let the sand slide down naturally to cover the first layer of the model, with a thickness of about 150-200mm. Start motor 10, which drives the combined cam 8 to rotate. The first cam 81 pushes the functional box 1 and the sand box to vibrate for about 15 seconds, allowing the sand particles to flow and fill the gaps around the foam model. The sand box vibrates at a low amplitude for a short time to avoid excessive amplitude and generate huge impact on the foam model, reducing the possibility of model deformation, bending or breakage, and at the same time reducing the damage of sand particles to the refractory coating layer on the model surface. Stop vibrating the sand box, add another layer of sand, and then vibrate at a low amplitude again. Repeat this process until the sand completely covers the model and is 50-100mm higher. Step 5: Seal the upper surface of the sand box with a plastic film. Place the cover plate 9 on top of the function box 1 using the first and fourth function cylinders. The lower end of the pressure plate 91 of the cover plate 9 can enter the sand box to pressurize the sand particles inside. Start the motor 10, which drives the combined cam 8 to rotate. The first cam 81 pushes the function box 1 and the sand box to vibrate for about 60 seconds to ensure uniform compactness of the sand mold. At the same time, the vacuum pump works, creating negative pressure inside the sand box. The air guide pipe 15 helps to extract air between the sand particles, making the sand mold more compact. Step Six: After the sand mold is formed, the motor 10 and vacuum pump stop working. The second limiting block 171 at the working end of the second functional cylinder 17 is located inside the second limiting groove 231. The position of the functional box 1 is fixed. The cover plate 9 is taken away from the top of the functional box 1 by the first functional cylinder 26 and the fourth functional cylinder. The pouring cup is inserted into the pouring channel of the sand mold. Liquid metal is poured into the sand mold through the ladle. Under the heat of the liquid metal, the EPS model undergoes pyrolysis and vaporization, generating a large amount of gas. The vacuum pump works, and a negative pressure is formed inside the sand box. The gas guide pipe 15 can help extract the gas and reduce the impact of the gas on the casting quality. Step 7: After pouring, continue to maintain the negative pressure inside the sand box for 3-5 minutes before turning off the negative pressure pump. After the casting has cooled, rotate the handle 42 to separate the four box plates 4. The box plates 4 separate from the sand mold, and the sand mold remains on the upper surface of the first support plate 2. Step 8: Adjust the position of the first support plate 2 using the movable rod 12. During the movement of the first support plate 2 from its upper limit position to its lower limit position, the external thread 51 moves axially relative to the internal thread 61. Combined with the rotation of the rod 5 relative to the first sleeve 6, this results in the rotation of the second support plate 3 relative to the first support plate 2. (Refer to...) Figure 5 When the first limiting block 121 is inserted into the first limiting groove 251 at the bottom of the slide 25, the first support plate 2 is at the lower limit position, the second dropping hole 31 is connected to the first dropping hole 201, the first dropping hole 201 is in the open state, the first support plate 2 covers the through hole in the middle of the first grid support plate 102 and the second grid support plate 71, and the sand box comes to the bottom of the functional box 1. At the same time, the position of the combined cam 8 is adjusted by the third function cylinder 24, with reference to... Figure 7 At this time, the second cam 82 remains in contact with the push plate 22; Step 9: The second functional cylinder 17 drives the second limiting block 171 to leave the second limiting groove 231, and starts the motor 10. The motor 10 drives the second cam 82 to rotate. The second cam 82 can push the functional box 1 to move back and forth in the horizontal direction, so as to realize the vibration of the sand box with a large amplitude. The sand box moves inside the functional box 1, and the sand mold is broken by impact, forming sand blocks and sand grains. The sand blocks and sand grains fall from the surface of the casting. The sand blocks and sand grains can pass through the grid support plate or the first drop hole 201 and enter the collection box 7 to realize the vibration of the sand mold to drop sand. Step 10: After the casting has been removed from the sand, motor 10 stops working, and the casting can be taken out using a lifting device.

[0044] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lost foam casting equipment, characterized in that, It includes a functional box and a collection box that are interconnected. The collection box is located below the functional box. A mesh support plate is provided between the collection box and the functional box. The collection box is slidably connected to the base in the horizontal direction. A vibration component is provided on the base for driving the collection box and the functional box to reciprocate in the horizontal direction. The functional box is equipped with a first support plate for placing sand molds. The first support plate is slidably connected to the functional box in the vertical direction. The box wall of the functional box is equipped with a box plate. A second support plate is rotatably located below the first support plate. The first support plate is equipped with a first discharge hole, and the second support plate is equipped with a second discharge hole. When the first support plate is at its upper limit position, the four box plates and the first support plate combine to form a sand box, and the second discharge hole is staggered from the first discharge hole to form a sealed state of the first discharge hole; when the first support plate is at its lower limit position, the four box plates separate, and the second discharge hole and the first discharge hole are connected to form an open state of the first discharge hole.

2. The lost foam casting equipment according to claim 1, characterized in that, The lower part of the second support plate is coaxially fixedly connected to a connecting rod. A first sleeve is fixedly installed inside the collection box. The first sleeve is coaxially arranged with the connecting rod. The lower end of the connecting rod is sleeved inside the first sleeve. The lower end of the connecting rod is provided with an external thread. The inside of the first sleeve is provided with an internal thread that matches the external thread. The external thread moves axially relative to the internal thread to form the rotation action of the connecting rod.

3. The lost foam casting equipment according to claim 2, characterized in that, A support rod is connected to the lower part of the first support plate, and a limit plate is connected to the lower end of the support rod. The limit plate is located inside the collection box.

4. The lost foam casting equipment according to claim 3, characterized in that, A movable rod is fixedly connected to the lower part of the limiting plate. The lower end of the movable rod extends from the collection box and is rotatably connected to a first limiting block. A slide is fixedly connected to the lower part of the collection box. Two first limiting grooves are arranged vertically on the side of the slide. The first limiting block is inserted into the first limiting groove to limit the first support plate in the vertical direction.

5. The lost foam casting equipment according to any one of claims 1-4, characterized in that, The vibration assembly includes a fixed base, an elastic element, a push plate, a connecting plate, and a combined cam. The fixed base is located on one side of the collection box, and the elastic element is connected between the fixed base and the collection box. The push plate is fixedly connected to the other side of the collection box through the connecting plate. The push plate contacts the cam in the combined cam. The cam rotates to push the collection box to reciprocate in the horizontal direction to generate vibration.

6. The lost foam casting equipment according to claim 5, characterized in that, The connecting plate is provided with a second limiting groove, and the base is provided with a second limiting block for limiting the displacement of the connecting plate.

7. The lost foam casting equipment according to claim 6, characterized in that, The combined cam includes a first cam, a second cam, and a second sleeve arranged coaxially. The second sleeve is connected between the first cam and the second cam. The long end of the first cam and the short end of the second cam are located on the same side, and the endpoints of the long end of the first cam and the short end of the second cam coincide axially.

8. The lost foam casting equipment according to claim 7, characterized in that, A second rotating shaft is rotatably connected to the base. The combined cam is slidably sleeved on the second rotating shaft via a spline. The combined cam adjusts the contact state between the first cam or the second cam and the push plate by moving axially along the second rotating shaft.

9. The lost foam casting equipment according to claim 8, characterized in that, The top of the functional box is provided with a cover plate, and a pressure plate is connected to the lower part of the cover plate. The pressure plate is matched with the sand box.

10. The lost foam casting equipment according to claim 9, characterized in that, It also includes an air guide tube, which is connected to the interior of the functional box. A flexible hose is installed inside the functional box to connect the air guide tube and the sand box.

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