Special sand box device for automatic bottom shakeout in lost foam casting

Abstract

The invention belongs to the technical field of evanescent mode casting, and particularly discloses an evanescent mode casting automatic bottom shakeout special sand box device which comprises a sand box body used for containing an evanescent mode and shakeout and used for evanescent mode casting. The transportation frame is placed at the bottom of the sand box body and used for driving the sand box body to move; the sand shakeout component comprises two turning plates, the number of the turning plates is two, the two turning plates are oppositely arranged, the outer side ends of the turning plates are rotationally connected with the inner rod in a sleeving mode, and the turning plates are located in the leakage groove. The sliding rod is fixed to the bottom of the turning plate. The inserting rods move at the bottoms of the sliding rods through movement of the pulling plates, the sliding rods are limited through the inserting rods with different heights, and therefore the inclination angle of the turning plate in the leakage groove is limited, simple sand shakeout of the sand box body is guaranteed, the speed of dry sand falling in the leakage groove and the through groove can be adjusted and controlled, and the production efficiency is improved. And the phenomenon that dry sand with high heat is scattered on the body of a worker due to the too high sand shakeout speed is avoided.

Description

Technical Field

[0001] This invention belongs to the field of lost foam casting technology, and specifically relates to a special sand box device for automatic bottom sand dropping in lost foam casting. Background Technology

[0002] Lost foam casting involves first creating a foam model according to process requirements, coating it with a special high-temperature resistant coating, drying it, placing it in a special sand box, filling it with dry sand according to process requirements, compacting it using three-dimensional vibration, and then casting molten metal under vacuum. At this point, the model vaporizes and disappears, and the molten metal replaces the model, replicating a casting identical to the foam model.

[0003] To achieve the sand removal process, the sand box and the molding sand and castings inside it are very heavy, and there is a lot of dry sand. The mechanism for sand removal at the top of the sand box is complex.

[0004] Therefore, it is necessary to invent a special sand box device for automatic bottom sand removal in lost foam casting to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a dedicated sand box device for automatic bottom sand removal in lost foam casting, thereby resolving the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An automatic bottom sand removal device for lost foam casting includes: a sand box body for holding lost foam and sand removal for lost foam casting; a transport frame placed at the bottom of the sand box body for moving the sand box body; and a sand removal component including: two flaps arranged opposite each other, with the outer ends of the flaps rotatably sleeved on an inner rod and the flaps positioned inside a slot; a sliding rod fixed to the bottom of the flaps; an arc-shaped plate installed on the bottom surface of the sand box body, the rotating flaps causing the sliding rod to slide on the top surface of the arc-shaped plate; and an insert rod horizontally penetrating the arc-shaped groove of the arc-shaped plate to limit the sliding rod.

[0007] Furthermore, the trough is located at the center of the bottom surface of the sand box body, and inner rods are provided on both sides inside the trough.

[0008] Furthermore, the bottom surface of the inner end of the flap is provided with a protruding strip, and the outer surfaces of both ends of the protruding strip are fixed with sliding rods by connecting rods, and the connecting rods slide in conjunction with the arc-shaped groove.

[0009] Furthermore, a vertical plate is fixed to the outer side of the arc-shaped plate, and multiple insert rods are horizontally inserted through the surface of the vertical plate, with pull plates connected to the outer ends of the multiple insert rods.

[0010] Furthermore, multiple insertion rods are arranged side by side at equal intervals, with the inner ends of the multiple insertion rods corresponding to and cooperating with the arc-shaped plate. An inclined plate is fixed at the bottom of the inner end of the insertion rod, and the bottom end of the inclined plate is in contact with the top surface of the next inclined rod. The inner ends of the insertion rods and the top ends of the inclined rods are all chamfered.

[0011] Furthermore, a through groove is provided at the center of the bottom surface of the transport frame, and the through groove corresponds to the drain groove.

[0012] Furthermore, the sand box body is generally designed as a square shape, with a bottom strip fixed to the bottom of the outer side of the sand box body. The bottom strip is limited by a locking component on the top surface of the transport frame. The locking component includes an L-shaped frame, a rotating ring, a circular plate, an insert plate, and a fixing rod. Multiple fixing rods are fixed to the top surface of the transport frame. The fixing rods are located on the outer side of the sand box body. A circular plate is fixed to the inner end of the fixing rod. A rotating ring is rotatably sleeved on the outer side of the circular plate. An L-shaped frame is connected to the outer side of the rotating ring. Multiple slots are provided on the outer circumference of the rotating ring. The inner end of the insert plate is inserted into the slot using a locking tooth. The L-shaped frame is snapped onto the bottom strip.

[0013] Furthermore, an outer frame is fixed to the outer circumference of the circular plate, the outer frame is snapped onto the outside of the rotating ring, and an insert plate is inserted into the center of the outer frame.

[0014] Furthermore, a sliding plate is provided on the outer side of the outer frame, and a crossbar passes through the sliding plate on the outer side of the outer frame. A baffle is connected to the outer end of the crossbar, and an elastic element connects the inner side of the baffle to the outer side of the sliding plate.

[0015] Furthermore, the bottom of the inner side of the card slot is provided with an inclined surface, and the top of the inner side of the card slot is provided with a flat surface.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention moves the insert rod at the bottom of the slide rod by moving the pull plate. The slide rod is limited by insert rods of different heights, thereby limiting the tilt angle of the flap inside the trough. This ensures simple sand drop of the sand box body and can control the speed at which dry sand falls inside the trough and through-channel, preventing the hot dry sand from falling onto the workers due to excessively fast sand drop speed.

[0017] 2. The present invention uses the elastic force of the elastic element to make the locking teeth on the inner side of the insert plate insert into the slot, and the top surface of the inner side of the slot cooperates with the locking teeth, so as to avoid the sand box body and the transport frame from misalignment due to movement, and to ensure the stability of the sand box body on the top of the transport frame. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the automatic bottom sand box device for lost foam casting according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the bottom component of the transport frame according to an embodiment of the present invention; Figure 3This is a schematic diagram of some components of the sand-falling component according to an embodiment of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the flap according to an embodiment of the present invention; Figure 5 This is an embodiment of the present invention. Figure 1 Enlarged view of section A in the diagram; Figure 6 This is a schematic diagram of the connection between the L-shaped frame and the swivel ring according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the circular plate connecting the outer frame according to an embodiment of the present invention; In the diagram: 1. Sand box body; 101. Bottom strip; 2. Transport frame; 3. Flip plate; 301. Inner rod; 4. Slide rod; 5. Arc plate; 501. Arc groove; 6. Insert rod; 601. Inclined plate; 7. Vertical plate; 8. Pull plate; 9. Through groove; 10. L-shaped frame; 11. Rotary ring; 111. Slot; 112. Inclined surface; 12. Circular plate; 13. Insert plate; 131. Clamping tooth; 14. Fixing rod; 15. Outer frame; 16. Slide plate; 17. Crossbar; 18. Elastic element. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0020] This invention provides a special sand box device for automatic bottom sand removal in lost foam casting, such as... Figure 1 and Figure 2 As shown, it includes: a sand box body 1, which is generally set as a square body. The sand box body 1 contains lost foam casting and sand dropping. The sand box body 1 is placed on the top surface of the transport frame 2. At this time, the transport frame 2 uses locking components to limit the sand box body 1. The transport frame 2 is generally set as a plate, and multiple rollers are fixed on the bottom surface of the transport frame 2. The transport frame 2 uses multiple rollers to run on the track. The moving transport frame 2 uses locking components to drive the sand box body 1 to move synchronously.

[0021] A trough is provided at the center of the bottom surface of the sand box body 1, and a sand dropping component is provided inside the trough. A through groove 9 corresponding to the trough is provided at the center of the transport frame 2. The through groove 9 corresponds to the trough.

[0022] Specifically, the sand-falling component seals the drainage groove on the bottom surface of the sand box body 1, and the lost foam is placed inside the sand box body 1. Dry sand is then scattered into the sand box body 1 using the sand-falling equipment, gradually submerging the lost foam. The casting section at the top of the lost foam is then cut, ensuring that the top of the casting section is on top of the dry sand. Molten metal is poured into the lost foam through the top of the casting section. During the casting process, the lost foam transforms into gas that permeates through the sand and is discharged through multiple vent pipes on the surface of the sand box body 1.

[0023] After pouring, the transport frame 2 is moved to the top of the sand drop trough. The pouring mold is pulled out from the top of the sand box body 1 using the lifting equipment. The sand drop component is opened, and the dry sand inside the sand box body 1 falls into the sand drop trough through the sluice and through groove 9, completing the discharge treatment of dry sand.

[0024] To discharge dry sand from inside the sand box body 1, a chute is opened using a sand discharge component. Figures 1 to 4 The sand-falling components include: a flap 3, a sliding rod 4, an arc-shaped plate 5, an insert rod 6, a vertical plate 7, and a pull plate 8. Two opposing flaps 3 are installed inside the trough. Inner rods 301 are installed on both sides of the trough. The two flaps 3 correspond one-to-one with the two inner rods 301. The outer end of the flap 3 is rotatably sleeved onto the surface of the inner rod 301. The flap 3 is located inside the trough. A protruding strip is provided on the bottom surface of the inner end of the flap 3. Sliding rods 4 are fixed to the outer sides of both ends of the protruding strip using connecting rods. Multiple arc-shaped plates 5 are installed at the bottom of the sand box body 1. The arc-shaped plates 5 are located at the bottom of the flaps 3, and the sliding rods 4 at both ends of the flaps 3 correspond to the two arc-shaped plates 5 respectively. A vertical plate 7 is fixed to the outer side of the arc-shaped plate 5, and an arc-shaped groove 501 is provided at the center of the arc-shaped plate 5. The connecting rod slides into the arc-shaped groove 501.

[0025] Multiple insert rods 6 are horizontally oriented through the surface of the vertical plate 7, arranged equidistantly. The inner ends of the insert rods 6 are horizontally oriented through the arc grooves 501 of the arc plate 5. An inclined plate 601 is fixed to the bottom of the inner end of the insert rod 6, and the bottom end of the inclined plate 601 is in contact with the top surface of the next inclined rod 6. The inner ends of the insert rods 6 and the top ends of the inclined rods 601 are chamfered. At this time, the inner end of the insert rod 6 is set as a hemispherical head, and the inner end of the insert rod 6 corresponds to the slide rod 4. The outer ends of the multiple insert rods 6 are connected to a pull plate 8. A drive device for moving the pull plate 8 is installed on the bottom surface of the transport frame 2. The drive device is set as a cylinder, and the output end of the drive device is connected to the outer side of the pull plate 8.

[0026] Specifically, the flap 3 is vertically installed at the bottom of the sand box body 1, and the trough is in the open state at this time. To seal the trough, the output end of the drive device causes the pull plate 8 to move inward. The inwardly moving pull plate 8 gradually approaches the vertical plate 7, and the pull plate 8 causes multiple insert rods 6 to gradually penetrate the arc groove 501 of the arc plate 5. The inclined plate 601 at the inner end of the insert rod 6 pushes the slide rod 4. At this time, the slide rod 4 slides on the top surface of the arc plate 5. The sliding slide rod 4 uses the connecting rod to make the flap 3 rotate. The slide rod 4 gradually slides to the top of the insert rod 6 through the inclined rod 601 and the hemispherical head. At this time, the connecting rod moves inside the arc groove 501 until the surface of the rotating slide rod 4 is in contact with the bottom surface of the sand box body 1. At this time, the flap 3 is in a horizontal state inside the trough.

[0027] When the inner side of the pull plate 8 is attached to the outer side of the vertical plate 7, the inner end of the topmost insert rod 6 is at the bottom of the slide rod 4. At this time, the insert rod 6 limits the flap 3 through the slide rod 4 and the connecting rod. The flap 3 is in a horizontal state inside the trough, and the two flaps 3 cooperate to seal the trough.

[0028] The lost foam is placed inside the sand box body 1. Dry sand is scattered into the sand box body 1 using the sand dropping equipment. The dry sand and the lost foam are positioned on the top of the two flip plates 3. Molten metal is poured into the lost foam. After the casting model is formed, the casting model is pulled out from the top opening of the sand box body 1 until the transport frame 2 moving on the track positions the sand box body 1 at the top of the sand dropping trough.

[0029] The output end of the drive device pulls the pull plate 8 to move. At this time, the pull plate 8 gradually approaches the inner wall of the through groove 9. The outwardly moving pull plate 8 pulls multiple insert rods 6 to move synchronously. The insert rods 6 move inside the arc groove 501 until the topmost insert rod 6 separates from the slide rod 4. The weight of the dry sand causes the outer end of the flap 3 to rotate in the opposite direction on the surface of the inner rod 301. The inner end of the flap 3 gradually moves down into the through groove 9. At this time, the two flaps 3 cannot seal the leakage groove until the slide rod 4 contacts the next insert rod 6. At this time, the flap 3 can no longer rotate. The dry sand inside the sand box body 1 is gradually discharged through the leakage groove and the through groove 9.

[0030] Gradually pull the pull plate 8 closer to the inner wall of the through groove 9 until the outer side of the pull plate 8 touches the inner wall of the through groove 9. At this time, the bottommost insert rod 6 can no longer restrict the slide rod 4. The dry sand inside the sand box body 1 makes the flap 3 stand vertically. The dry sand inside the sand box body 1 is discharged using the trough and through groove 9.

[0031] In this embodiment, the movement of the pull plate 8 causes the insertion rod 6 to move at the bottom of the slide rod 4. The slide rod 4 is limited by the insertion rods 6 at different heights, thereby limiting the tilt angle of the flip plate 3 inside the trough, ensuring simple sand drop of the sand box body 1, and controlling the speed at which dry sand falls inside the trough and through groove 9, avoiding excessively fast sand drop speed that causes hot dry sand to scatter onto the workers.

[0032] In order to lock the sand box body 1 on the top surface of the transport frame 2, a locking component is used to limit the sand box body 1. Figure 1 , Figures 5 to 7 In the sand box body 1, a bottom strip 101 is fixed to the bottom of the outer side. The bottom strip 101 is limited by a locking component on the top surface of the transport frame 2. The locking component includes an L-shaped frame 10, a rotating ring 11, a circular plate 12, an insert plate 13, and a fixing rod 14. Multiple fixing rods 14 are fixed to the top surface of the transport frame 2. The fixing rods 14 are located on the outside of the sand box body 1. A circular plate 12 is fixed to the inner end of the fixing rod 14. A rotating ring 11 is rotatably sleeved on the outside of the circular plate 12. An L-shaped frame 10 is connected to the outside of the rotating ring 11. Multiple slots 111 are provided on the outer circumference of the rotating ring 11. The inner end of the insert plate 13 is inserted into the slot 111 using a locking tooth 131. The L-shaped frame 10 is snapped onto the bottom strip 101. An inclined surface 112 is provided on the bottom of the inner side of the slot 111. The top of the inner side of the slot 111 is set as a flat surface.

[0033] An outer frame 15 is fixed to the outer side of the circular plate 12. The outer frame 15 is snapped onto the outside of the rotating ring 11, and an insert plate 13 is inserted into the center of the outer frame 15. A slide plate 16 is provided on the outside of the outer frame 15. A crossbar 17 passes through the slide plate 16 on the outer side of the outer frame 15. A baffle is connected to the outer end of the crossbar 17. An elastic element 18 is used to connect the inner side of the baffle to the outer side of the slide plate 16. The elastic element 18 is a spring sheet.

[0034] Specifically, the sand box body 1 is placed on top of the transport frame 2, at which point the L-shaped frame 10 is in a vertical position. The L-shaped frame 10 is pushed to rotate, causing the rotating ring 11 to rotate on the surface of the circular plate 12. The outer frame 15 of the circular plate 12 defines the rotating ring 11. The rotating ring 11 slides on the surface of the locking teeth 131 at the inner end of the insert plate 13. When the locking teeth 131 correspond to the slot 111, the elastic force of the elastic element 18 causes the sliding plate 16 to slide on the surface of the crossbar 17. The inwardly moving sliding plate 16 uses the insert plate 13 to allow the locking teeth 131 to engage inside the slot 111. As the L-shaped frame 10 continues to rotate, the inclined surface 112 is provided at the bottom of the inner side of the slot 111. The rotating ring 11 continues to rotate, and the inclined surface 112 causes the locking tooth 131 to move out of the slot 111. The outwardly moving locking tooth 131 uses the insert plate 13 to squeeze the elastic member 18 until the elastic force of the elastic member 18 causes the inner end of the locking tooth 131 to fit against the outer side of the circumference of the rotating ring 11.

[0035] When the L-shaped bracket 10 is snapped onto the bottom strip 101 at the bottom of the sand box body 1, the elastic force of the elastic element 18 causes the locking teeth 131 at the inner end of the insert plate 13 to be inserted into the slot 111. Since the top of the inner side of the slot 111 is set as a plane, the top surface of the inner side of the slot 111 cooperates with the locking teeth 131. At this time, multiple L-shaped brackets 10 are snapped onto the top of the bottom strip 101, thus locking the sand box body 1.

[0036] In this embodiment, the elastic force of the elastic member 18 causes the locking tooth 131 at the inner end of the insert plate 13 to be inserted into the slot 111, and the inner top surface of the slot 111 cooperates with the locking tooth 131 to prevent the sand box body 1 from being misaligned and moved with the transport frame 2 due to movement, thus ensuring the stability of the sand box body 1 on the top of the transport frame 2.

[0037] Working principle of this invention: Reference Figures 1 to 7As shown, the sand box body 1 is placed on the top surface of the transport frame 2, at which point the L-shaped frame 10 is in a vertical position. Pushing the L-shaped frame 10 to rotate causes the rotating ring 11 to rotate on the surface of the circular plate 12, with the outer frame 15 of the circular plate 12 defining the rotating ring 11. The rotating ring 11 slides on the surface of the locking teeth 131 at the inner end of the insert plate 13. When the locking teeth 131 correspond to the slot 111, the elastic force of the elastic element 18 causes the sliding plate 16 to slide on the surface of the crossbar 17. The inwardly moving sliding plate 16 uses the insert plate 13 to allow the locking teeth 131 to engage inside the slot 111. As the L-shaped frame 10 continues to rotate, the inclined surface 112 is provided at the bottom of the inner side of the slot 111. The rotating ring 11 continues to rotate, and the inclined surface 112 causes the locking tooth 131 to move out of the slot 111. The outwardly moving locking tooth 131 uses the insert plate 13 to squeeze the elastic member 18 until the elastic force of the elastic member 18 causes the inner end of the locking tooth 131 to fit against the outer side of the circumference of the rotating ring 11.

[0038] When the L-shaped bracket 10 is snapped onto the bottom strip 101 at the bottom of the sand box body 1, the elastic force of the elastic element 18 causes the locking teeth 131 at the inner end of the insert plate 13 to be inserted into the slot 111. Since the top of the inner side of the slot 111 is set as a plane, the top surface of the inner side of the slot 111 cooperates with the locking teeth 131. At this time, multiple L-shaped brackets 10 are snapped onto the top of the bottom strip 101, thus locking the sand box body 1.

[0039] The sand-falling component seals the drainage groove on the bottom surface of the sand box body 1. The lost foam is placed inside the sand box body 1, and dry sand is scattered into the sand box body 1 using the sand-falling equipment. The dry sand gradually submerges the lost foam. The casting section at the top of the lost foam is cut so that the top of the casting section is on top of the dry sand. Molten metal is poured into the lost foam through the top of the casting section. During the pouring process, the lost foam is converted into gas that permeates through the sand and is discharged through multiple vent pipes on the surface of the sand box body 1.

[0040] After pouring, the transport frame 2 is moved to the top of the sand drop trough, and the poured mold is pulled out from the top of the sand box body 1 using the lifting equipment. The output end of the drive equipment pulls the pull plate 8 to move. At this time, the pull plate 8 gradually approaches the inner wall of the through groove 9. The outwardly moving pull plate 8 pulls multiple insert rods 6 to move synchronously. The insert rods 6 move inside the arc groove 501 until the topmost insert rod 6 separates from the slide rod 4. The weight of the dry sand causes the outer end of the flap 3 to rotate in the opposite direction on the surface of the inner rod 301. The inner end of the flap 3 gradually moves down into the through groove 9. At this time, the two flaps 3 cannot seal the leak groove until the slide rod 4 contacts the next insert rod 6. At this time, the flap 3 can no longer rotate, and the dry sand inside the sand box body 1 is gradually discharged through the leak groove and the through groove 9.

[0041] Gradually pull the pull plate 8 closer to the inner wall of the through groove 9 until the outer side of the pull plate 8 touches the inner wall of the through groove 9. At this time, the bottommost insert rod 6 can no longer restrict the slide rod 4. The dry sand inside the sand box body 1 makes the flap 3 stand vertically. The dry sand inside the sand box body 1 is discharged using the trough and through groove 9.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A special sand box device for automatic bottom sand removal in lost foam casting, characterized in that, include: The sand box body (1) holds the lost foam and the fallen sand, and is used for lost foam casting; The transport frame (2) is placed at the bottom of the sand box body (1) and is used to move the sand box body (1); The sand removal components include: Flip plate (3), the number of flip plates (3) is set to two, the two flip plates (3) are arranged opposite each other, the outer end of the flip plate (3) is rotated and sleeved on the inner rod (301), and the flip plate (3) is inside the trough; The sliding rod (4) is fixed to the bottom of the flap (3); An arc-shaped plate (5) is installed on the bottom surface of the sand box body (1), and the rotating flap (3) causes the slide rod (4) to slide on the top surface of the arc-shaped plate (5); Insert rod (6) horizontally penetrates the arc groove (501) of arc plate (5) to limit slide rod (4).

2. The automatic bottom sand box device for lost foam casting according to claim 1, characterized in that: The trough is located at the center of the bottom surface of the sand box body (1), and inner rods (301) are provided on both sides inside the trough.

3. The automatic bottom sand box device for lost foam casting according to claim 2, characterized in that: The inner bottom surface of the flap (3) is provided with a protruding strip, and the outer surfaces of both ends of the protruding strip are fixed with a sliding rod (4) by a connecting rod, and the connecting rod slides in conjunction with the arc groove (501).

4. The automatic bottom sand box device for lost foam casting according to claim 3, characterized in that: A vertical plate (7) is fixed to the outer side of the arc plate (5), and multiple insert rods (6) are horizontally inserted through the surface of the vertical plate (7). Pull plates (8) are connected to the outer ends of the multiple insert rods (6).

5. The automatic bottom sand box device for lost foam casting according to claim 4, characterized in that: Multiple insert rods (6) are arranged side by side at equal intervals. The inner ends of the multiple insert rods (6) correspond to the arc plate (5). An inclined plate (601) is fixed at the bottom of the inner end of the insert rod (6), and the bottom end of the inclined plate (601) is in contact with the top surface of the next inclined rod (6). The inner ends of the insert rods (6) and the top ends of the inclined rods (601) are all chamfered.

6. The automatic bottom sand box device for lost foam casting according to claim 2, characterized in that: The transport frame (2) has a through groove (9) at the center of its bottom surface, which corresponds to the drain groove.

7. The automatic bottom sand box device for lost foam casting according to claim 1, characterized in that: The sand box body (1) is generally set as a square body. The bottom of the outer side of the sand box body (1) is fixed with a bottom strip (101). The top surface of the transport frame (2) is limited by a locking component. The locking component includes: an L-shaped frame (10), a rotating ring (11), a circular plate (12), an insert plate (13), and a fixing rod (14). The top surface of the transport frame (2) is fixed with multiple fixing rods (14). The fixing rods (14) are located outside the sand box body (1). The inner end of the fixing rods (14) is fixed with a circular plate (12). The outer side of the circular plate (12) is rotatably sleeved with a rotating ring (11). The outer side of the rotating ring (11) is connected with an L-shaped frame (10). The outer side of the circumference of the rotating ring (11) is provided with multiple slots (111). The inner end of the insert plate (13) is inserted into the slot (111) using a tooth (131). The L-shaped frame (10) is snapped onto the bottom strip (101).

8. The automatic bottom sand box device for lost foam casting according to claim 7, characterized in that: The outer frame (15) is fixed on the outer side of the circular plate (12). The outer frame (15) is snapped on the outside of the rotating ring (11). A plug plate (13) is inserted at the center of the outer frame (15).

9. The automatic bottom sand box device for lost foam casting according to claim 8, characterized in that: A slide plate (16) is provided on the outer side of the outer frame (15). A crossbar (17) passes through the slide plate (16) on the outer side of the outer frame (15). A baffle is connected to the outer end of the crossbar (17). An elastic element (18) is used to connect the inner side of the baffle to the outer side of the slide plate (16).

10. The automatic bottom sand box device for lost foam casting according to claim 7, characterized in that: The bottom inner side of the card slot (111) is provided with a slope 112, and the top inner side of the card slot (111) is provided with a plane.

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