Nodular cast iron casting casting device

Abstract

The invention relates to the technical field of spheroidal graphite cast iron casting, and particularly discloses a spheroidal graphite cast iron casting casting device which comprises a casting table, a sand wrapping bag is inflated through an air guide module, so that the sand wrapping bag is attached to a containing box, a blocking plate, an upper sand box, a lower sand box, a middle plate, a first-stage outer cover and a second-stage outer cover, and the sand wrapping bag is filled with sand; the sand wrapping bag is fully filled with sand through the vibration motor, air in the sand wrapping bag is pumped out, sand particles are locked together under pressure, blocking phase change occurs, the sand particles are instantly changed into a hard solid state from a flowing state, the casting sand box is clamped, the middle plate is matched, and the top of the integrated sand is limited. And after casting is completed, the sand wrapping bag ascends, the middle plate is rotated, the sand wrapping bag is inflated, the air pressure in the sand wrapping bag is made to be consistent with the outside, and the sand in the sand wrapping bag is conveniently dumped and recycled into the sand storage cover.

Description

Technical Field

[0001] This invention belongs to the field of ductile iron casting technology, and specifically relates to a casting device for ductile iron castings. Background Technology

[0002] Ductile iron is a high-strength new type of cast iron material, named for the spherical shape of its internal graphite. In a heat-treated ductile iron casting device (authorized announcement number CN118143240B), "by filling the placement tank with sand to cover the upper and lower sand boxes, the pressure generated by the sand provides reliable extrusion force, suitable for casting sand boxes used in magnetic yoke processing, increasing the pressure box force, and giving the sand box high rigidity during casting to withstand the expansion pressure generated during the solidification of the casting." Firstly, the sand's own weight increases the pressure box force; however, the overall effect of the sand is insufficient, resulting in insufficient pressure box force and reduced clamping effect on the upper and lower sand boxes. Furthermore, the subsequent sand recovery relies on gravity to allow the sand to flow into the collection box, but the recovery effect on sand at the top of the upper sand box is insufficient. Summary of the Invention

[0003] The purpose of this invention is to provide a casting apparatus for ductile iron castings to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A casting apparatus for ductile iron castings includes a casting table, a placement box with a U-shaped structure at the center of the top of the casting table, baffle plates symmetrically connected to the front and back of the placement box, a vibration motor connected to the side of a set of baffle plates away from the placement box, a lower sand box at the center of the bottom of the inner cavity of the placement box, an upper sand box at the top of the lower sand box, a feed pipe connected to the center of the top of the upper sand box, a cap connected to the top of the feed pipe, a middle plate above the upper sand box, the middle plate slidingly fitting with the inner wall of the placement box, a through-hole in the center of the middle plate, a gas guiding module on the middle plate, the gas guiding module including sandbags and an air pump, the sandbags symmetrically connected to the bottom of the middle plate, the air pump connected to the center of one side of the top of the middle plate by positioning bolts, a sand inlet module at the top of the middle plate, the sand inlet module including a sand storage cover connected to the top of the middle plate, a lifting module at the top of the casting table, the lifting module including a top plate and an electric telescopic rod, the top plate being located above the sand storage cover, the electric telescopic rod being connected to the center of the top of the top plate.

[0006] Preferably, the air guiding module also includes a square slot, a filter screen, a conduit, and a primary solenoid valve. The square slot is symmetrically opened on both sides of the bottom of the middle plate and is connected to the inner cavity of the sandbag. The filter screen is located in the square slot and is connected to the middle plate. The conduit is symmetrically connected to both sides of the air pump, and the end of the conduit away from the air pump passes through the middle plate and is connected to the square slot. The primary solenoid valve is located on the conduit. The filter screen makes it difficult for sand to enter the conduit.

[0007] A pressure gauge is installed on the duct.

[0008] Preferably, the sand inlet module also includes a primary circular groove, a secondary circular groove, a sand inlet pipe, and a secondary solenoid valve. The primary circular groove is symmetrically opened on both sides of the bottom of the middle plate, and the secondary circular groove is symmetrically opened on both sides of the top of the middle plate. The secondary circular groove is connected to the primary circular groove. The sand inlet pipe is located in the primary circular groove, and the top of the sand inlet pipe passes through the primary circular groove and the secondary circular groove in sequence. The bottom of the sand inlet pipe is connected to the inner cavity of the sandbag. The secondary solenoid valve is located on the sand inlet pipe and is located in the secondary circular groove. The sand inlet pipe facilitates the flow of sand between the sandbag and the sand storage cover.

[0009] Preferably, the sand inlet module further includes a support plate, three-stage circular grooves, pressure sensors, and a cylinder. The support plate is slidably fitted inside the sand storage hood, and two sets of support plates are symmetrically arranged vertically. The three-stage circular grooves are symmetrically opened on both sides of the lower support plate, and the three-stage circular grooves penetrate vertically through the lower support plate. The top end of the sand inlet pipe is slidably fitted inside the three-stage circular grooves. Pressure sensors are symmetrically arranged on both sides of the inner cavity of the sand storage hood. The upper and lower sides of the lower pressure sensor are connected to the lower support plate and the middle plate, respectively. The upper pressure sensor... The sensor is connected to the top surface of the inner cavity of the sand storage cover and the upper support plate on the top side, respectively. The cylinder is connected to the top of the middle plate, and the circular hole is connected to the inner cavity of the cylinder. The top of the cylinder passes through the lower support plate, the upper support plate and the sand storage cover in sequence. The outer wall of the cylinder slides with the two sets of support plates. The top of the outer wall of the cylinder is connected to the sand storage cover. The three-stage circular groove design ensures that the lower support plate does not affect the sand flow effect of the sand inlet pipe. The cylindrical design facilitates the injection of material between the upper and lower sand boxes through the feed pipe.

[0010] Preferably, the sand-feeding module also includes a vertical plate, a drive motor, and a rotating shaft. The vertical plates are symmetrically connected to the top two sides of the middle plate. The drive motor is located on one side of the vertical plate, and the output shaft of the drive motor is connected to the vertical plate. The rotating shaft is connected to the other side of the vertical plate. When the drive motor is turned on, the vertical plate and the middle plate rotate 180° around the output shaft of the drive motor as the central axis, so that the sandbag is positioned on top of the middle plate.

[0011] Preferably, the lifting module also includes a support rod and a connecting cover. The support rod is connected to the four corners of the top of the casting table, and the top of the support rod is connected to the top plate. The connecting cover is located below the top plate, and the output end of the bottom of the electric telescopic rod passes through the top plate and is connected to the middle of the top of the connecting cover. The connecting cover has a U-shaped structure, and both sets of vertical plates are inside the connecting cover. The output shaft of the drive motor passes through one end of the connecting cover, and the outer wall of the output shaft of the drive motor slides with the connecting cover. The drive motor is connected to the connecting cover through positioning bolts, and the end of the rotating shaft away from the vertical plates is connected to the bearing of the connecting cover. Under the action of the connecting cover, the output end of the bottom of the electric telescopic rod can drive the middle plate to descend.

[0012] Preferably, the lifting module also includes a primary outer cover, a return spring, and a bottom ring. The primary outer cover and the bottom ring are both sleeved on the outside of the feed pipe, and the top of the primary outer cover is connected to the middle plate. The inner cavity of the primary outer cover is connected to the round hole. The return spring is symmetrically connected to both sides of the bottom of the primary outer cover, and the bottom end of the return spring is connected to the bottom ring. This prevents the sandbag from affecting the feed pipe and the cover while not affecting their use.

[0013] Preferably, the lifting module further includes a secondary outer cover, a limiting slot, and a limiting block. The secondary outer cover is slidably fitted onto the outer wall of the primary outer cover, and the outer wall of the bottom ring is connected to the bottom of the inner wall of the secondary outer cover. The limiting slots are symmetrically opened on both sides of the inner wall of the secondary outer cover. The limiting block is slidably fitted into the limiting slot and is connected to the bottom of the outer wall of the primary outer cover. Through the limiting slot and the limiting block, the primary outer cover is restricted to the secondary outer cover, preventing the primary outer cover from detaching from the secondary outer cover.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In use, air is injected into the sandbag via the air-guiding module, causing the sandbag to adhere to the placement box, baffle plate, upper sand box, lower sand box, intermediate plate, primary outer cover, and secondary outer cover respectively. Sand is then filled into the sandbag, and a vibration motor ensures the sand is fully filled. Air is then extracted from the sandbag, causing the sand particles to "lock" together under pressure, undergoing a "blockage phase change," instantly transforming from a flowing state to a hard solid state. This clamps the casting sand box, and in conjunction with the intermediate plate, it further solidifies the already formed sand. The top of the integrated sand container is restricted to fix and clamp the sand bag and sand to the upper and lower sand boxes. After casting is completed, the sand bag is raised and the middle plate is rotated to inflate the sand bag, so that the air pressure inside the sand bag is the same as the outside air pressure. This makes it easy to pour the sand out of the sand bag and collect it into the sand storage hood. Through this device, the sand is clamped and fixed to the upper and lower sand boxes while the sand can be fully recycled. At the same time, the deformable function of the sand inside the sand bag allows the sand to change shape according to the upper and lower sand boxes of different specifications. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of a casting device for ductile iron castings.

[0016] Figure 2 This is a schematic diagram of a placement box for a casting device for ductile iron castings.

[0017] Figure 3 This is a schematic diagram of the rear structure of a placement box for a casting device for ductile iron castings.

[0018] Figure 4 This is a schematic diagram of a sandbag wrapping device for casting ductile iron castings.

[0019] Figure 5 This is a schematic diagram of a pressure sensor for a ductile iron casting device.

[0020] Figure 6 This is a schematic diagram of a filter screen in a casting device for ductile iron castings.

[0021] Figure 7 This is a schematic diagram of the cover of a casting device for ductile iron castings.

[0022] Figure 8 This is a schematic diagram of the first-stage outer casing of a ductile iron casting device.

[0023] Figure 9 This is a schematic diagram of the secondary outer casing of a ductile iron casting device.

[0024] In the diagram: 1. Casting table; 11. Placement box; 12. Baffle plate; 13. Vibration motor; 14. Lower sand box; 15. Upper sand box; 16. Feed pipe; 17. Cover; 18. Intermediate plate; 19. Circular hole; 2. Air guiding module; 21. Sandbag; 22. Air pump; 23. Square slot; 24. Filter screen; 25. Guide pipe; 26. Primary solenoid valve; 3. Sand inlet module; 31. Sand storage cover; 32. Primary circular trough; 33. Secondary circular trough; 34. 35. Sand inlet pipe; 36. Secondary solenoid valve; 37. Bearing plate; 38. Tertiary circular groove; 39. Pressure sensor; 30. Cylinder; 310. Vertical plate; 311. Drive motor; 312. Rotating shaft; 4. Lifting module; 41. Top plate; 42. Electric telescopic rod; 43. Support rod; 44. Connecting cover; 45. Primary outer cover; 46. Return spring; 47. Bottom ring; 48. Secondary outer cover; 49. Restricting slot; 410. Restricting block. Detailed Implementation

[0025] Example 1

[0026] Please see Figures 1-9As shown, a casting apparatus for ductile iron castings includes a casting table 1. A placement box 11 is located at the center of the top of the casting table 1. The placement box 11 has a U-shaped structure. Baffle plates 12 are symmetrically connected to the front and rear of the placement box 11. A vibration motor 13 is connected to the side of a set of baffle plates 12 away from the placement box 11. A lower sand box 14 is located in the center of the bottom surface of the inner cavity of the placement box 11. An upper sand box 15 is located on top of the lower sand box 14. A feed pipe 16 is connected to the center of the top of the upper sand box 15. A cap 17 is connected to the top of the feed pipe 16. An intermediate plate 18 is located above the upper sand box 15. The intermediate plate 18 slides against the inner wall of the placement box 11. An opening is located in the center of the intermediate plate 18. There is a through-hole 19. An air guiding module 2 is provided on the middle plate 18. The air guiding module 2 includes a sandbag 21 and an air pump 22. The sandbag 21 is symmetrically connected to the bottom of the middle plate 18. The air pump 22 is connected to the middle of one side of the top of the middle plate 18 by positioning bolts. A sand inlet module 3 is provided on the top of the middle plate 18. The sand inlet module 3 includes a sand storage cover 31. The sand storage cover 31 is connected to the top of the middle plate 18. A lifting module 4 is provided on the top of the casting table 1. The lifting module 4 includes a top plate 41 and an electric telescopic rod 42. The top plate 41 is located above the sand storage cover 31. The electric telescopic rod 42 is connected to the middle of the top of the top plate 41.

[0027] refer to Figures 3-6 As shown, the air guiding module 2 also includes a square slot 23, a filter screen 24, a conduit 25, and a first-stage solenoid valve 26. The square slot 23 is symmetrically opened on both sides of the bottom of the middle plate 18 and is connected to the inner cavity of the sandbag 21. The filter screen 24 is located in the square slot 23 and is connected to the middle plate 18. The conduit 25 is symmetrically connected to both sides of the air pump 22, and the end of the conduit 25 away from the air pump 22 passes through the middle plate 18 and is connected to the square slot 23. The first-stage solenoid valve 26 is located on the conduit 25. The setting of the filter screen 24 makes it difficult for sand to enter the conduit 25.

[0028] A pressure gauge is installed on the conduit 25.

[0029] refer to Figure 5 and Figure 6 As shown, the sand inlet module 3 also includes a primary circular groove 32, a secondary circular groove 33, a sand inlet pipe 34, and a secondary solenoid valve 35. The primary circular groove 32 is symmetrically opened on both sides of the bottom of the intermediate plate 18, and the secondary circular groove 33 is symmetrically opened on both sides of the top of the intermediate plate 18. The secondary circular groove 33 is connected to the primary circular groove 32. The sand inlet pipe 34 is located in the primary circular groove 32, and the top of the sand inlet pipe 34 passes through the primary circular groove 32 and the secondary circular groove 33 in sequence. The bottom of the sand inlet pipe 34 is connected to the inner cavity of the sandbag 21. The secondary solenoid valve 35 is located on the sand inlet pipe 34 and is located in the secondary circular groove 33. The sand inlet pipe 34 facilitates the flow of sand between the sandbag 21 and the sand storage cover 31.

[0030] refer toFigures 1-5 As shown, the sand inlet module 3 also includes a support plate 36, a three-stage circular groove 37, a pressure sensor 38, and a cylinder 39. The support plate 36 is slidably fitted inside the sand storage cover 31, and two sets of support plates 36 are symmetrically arranged vertically. The three-stage circular groove 37 is symmetrically opened on both sides of the lower support plate 36, and the three-stage circular groove 37 penetrates vertically through the lower support plate 36. The top end of the sand inlet pipe 34 is slidably fitted inside the three-stage circular groove 37. The pressure sensor 38 is symmetrically arranged on both sides of the inner cavity of the sand storage cover 31. The upper and lower sides of the lower pressure sensor 38 are connected to the lower support plate 36 and the middle plate 18, respectively. The upper pressure sensor 38... The upper and lower sides are respectively connected to the top surface of the inner cavity of the sand storage cover 31 and the upper support plate 36. The cylinder 39 is connected to the top of the middle plate 18, and the circular hole 19 is connected to the inner cavity of the cylinder 39. The top of the cylinder 39 passes through the lower support plate 36, the upper support plate 36 and the sand storage cover 31 in sequence. The outer wall of the cylinder 39 is slidably engaged with the two sets of support plates 36. The top of the outer wall of the cylinder 39 is connected to the sand storage cover 31. The setting of the three-stage circular groove 37 ensures that the lower support plate 36 will not affect the sand flow effect of the sand inlet pipe 34. The setting of the cylinder 39 facilitates the injection of material between the upper sand box 15 and the lower sand box 14 through the feed pipe 16.

[0031] refer to Figures 1-4 As shown, the sand-feeding module 3 also includes a vertical plate 310, a drive motor 311, and a rotating shaft 312. The vertical plate 310 is symmetrically connected to the top two sides of the middle plate 18. The drive motor 311 is located on one side of the vertical plate 310, and the output shaft of the drive motor 311 is connected to the vertical plate 310. The rotating shaft 312 is connected to the other side of the vertical plate 310. When the drive motor 311 is turned on, the vertical plate 310 and the middle plate 18 rotate 180° around the output shaft of the drive motor 311 as the central axis, so that the sandbag 21 is placed on top of the middle plate 18.

[0032] refer to Figures 1-3 As shown, the lifting module 4 also includes a support rod 43 and a connecting cover 44. The support rod 43 is connected to the four corners of the top of the casting table 1, and the top of the support rod 43 is connected to the top plate 41. The connecting cover 44 is located below the top plate 41, and the output end of the bottom of the electric telescopic rod 42 passes through the top plate 41 and is connected to the middle of the top of the connecting cover 44. The connecting cover 44 has a U-shaped structure. Both sets of vertical plates 310 are inside the connecting cover 44. The output shaft of the drive motor 311 passes through one end of the connecting cover 44, and the outer wall of the output shaft of the drive motor 311 slides with the connecting cover 44. The drive motor 311 is connected to the connecting cover 44 through a positioning bolt. The end of the rotating shaft 312 away from the vertical plate 310 is connected to the bearing of the connecting cover 44. Under the action of the connecting cover 44, the output end of the bottom of the electric telescopic rod 42 can drive the middle plate 18 to descend.

[0033] refer to Figures 7-9 As shown, the lifting module 4 also includes a primary outer cover 45, a return spring 46, and a bottom ring 47. The primary outer cover 45 and the bottom ring 47 are both sleeved on the outside of the feed pipe 16, and the top of the primary outer cover 45 is connected to the middle plate 18. The inner cavity of the primary outer cover 45 is connected to the round hole 19. The return spring 46 is symmetrically connected to both sides of the bottom of the primary outer cover 45, and the bottom end of the return spring 46 is connected to the bottom ring 47. This prevents the sandbag 21 from interfering with the feed pipe 16 and the cover 17 without affecting their use.

[0034] refer to Figure 8 and Figure 9 As shown, the lifting module 4 also includes a secondary outer cover 48, a limiting slot 49, and a limiting block 410. The secondary outer cover 48 is slidably sleeved on the outer wall of the primary outer cover 45, and the outer wall of the bottom ring 47 is connected to the bottom of the inner wall of the secondary outer cover 48. The limiting slot 49 is symmetrically opened on both sides of the inner wall of the secondary outer cover 48. The limiting block 410 is slidably fitted in the limiting slot 49 and is connected to the bottom of the outer wall of the primary outer cover 45. Through the limiting slot 49 and the limiting block 410, the primary outer cover 45 is limited to the secondary outer cover 48, preventing the primary outer cover 45 from detaching from the secondary outer cover 48.

[0035] Working principle: The upper sand box 15 is placed on top of the lower sand box 14. The electric telescopic rod 42 is activated, and the output end of the bottom of the electric telescopic rod 42 drives the connecting cover 44 and the intermediate plate 18 to descend. The bottom surface of the secondary outer cover 48 and the bottom surface of the bottom ring 47 contact the top surface of the upper sand box 15. Under the action of the return spring 46, the primary outer cover 45 gradually retracts into the secondary outer cover 48. When the bottom surface of the connecting cover 44 contacts the top surface of the placement box 11, the connecting cover 44 cannot descend, and the output end of the electric telescopic rod 42 cannot continue to descend. The electric telescopic rod 42 sends a signal to the peripheral terminal. The peripheral terminal receives the signal and controls the electric telescopic rod 42 to close. The air pump 22 and the primary solenoid valve 26 are opened. The air pump 22 fills the sandbag 21 with air through the conduit 25. The sandbags 21 are made to fit snugly against the placement box 11, the baffle plate 12, the upper sand box 15, the lower sand box 14, the intermediate plate 18, the primary outer cover 45, and the secondary outer cover 48. The air pressure inside the sandbags 21 is monitored using a pressure gauge. After the sandbags 21 are fully fitted against these components, air is continuously introduced, increasing the air pressure inside the sandbags 21. This increase is monitored by the pressure gauge. When the air pressure increases, the pressure gauge sends a signal to the external terminal. The external terminal receives the signal and controls the air pump 22 and the primary solenoid valve 26 to close, while the secondary solenoid valve 35 and the vibration motor 13 open. Sand from the sand storage cover 31 enters through the sand inlet pipe 34. The sand is placed inside the sandbag 21, and the vibration motor 13 ensures that the sand is fully and evenly distributed inside the sandbag 21. The weight of the sand on top of the supporting plate 36 located below is monitored by the pressure sensor 38 located below. After the sandbag 21 is full of sand, the sand in the sand storage cover 31 no longer flows into the sandbag 21, and the weight of the sand on top of the supporting plate 36 located below, monitored by the pressure sensor 38, no longer changes. The pressure sensor 38 located below transmits a signal to the peripheral terminal. The peripheral terminal receives the signal and controls the secondary solenoid valve 35 and the vibration motor 13 to close, while the air pump 22 and the primary solenoid valve 26 open. The air pump 22 extracts the air from the sandbag 21 through the conduit 25, and the air is blocked by the filter screen 24. The sand inside the sandbag 21 is not easily allowed to enter the conduit 25. The air pressure inside the sandbag 21 is monitored by a pressure gauge. After the air is extracted, the air pressure inside the sandbag 21 no longer changes. The pressure gauge sends a signal to the external terminal. The external terminal receives the signal and controls the air pump 22 and the first-stage solenoid valve 26 to close, thereby clamping and fixing the sandbag 21 and the sand inside it to the upper sand box 15 and the lower sand box 14. The top of the sand is restricted by the intermediate plate 18 to ensure the clamping and fixing effect of the sand to the upper sand box 15 and the lower sand box 14. The cover 17 is opened, and the material is injected into the upper sand box 15 and the lower sand box 14 through the cylinder 39 and the round hole 19 via the feed pipe 16 for casting the ductile iron casting. After casting is completed, the electric telescopic rod 42 is activated.The connecting cover 44 causes the intermediate plate 18 and the sandbag 21 to rise, separating the upper sand box 15 from the lower sand box 14, thereby removing the casting;

[0036] To recycle sand from the sandbag 21 into the sand storage hood 31, the drive motor 311 is turned on, causing the vertical plate 310 and the intermediate plate 18 to rotate 180° around the output shaft of the drive motor 311, thus positioning the sandbag 21 at the top of the intermediate plate 18. After rotation, the drive motor 311 sends a signal to the peripheral terminal. The peripheral terminal receives the signal and controls the drive motor 311 to shut down, while the air pump 22 and the first-stage solenoid valve 26 open. The air pump 22 guides air into the sandbag 21 through the conduit 25 until the air pressure inside the sandbag 21 matches the outside pressure. At this point, the pressure gauge sends a signal to the peripheral terminal, which receives the signal and controls the air pump 22 and the first-stage solenoid valve 26 to open. The primary solenoid valve 26 is closed, and the secondary solenoid valve 35 is opened. Under the action of gravity, the sand in the sandbag 21 is easily recovered into the sand storage hood 31 through the sand inlet pipe 34. After the sand is reset, it is supported by the bearing plate 36 located above the intermediate plate 18 before rotation. The pressure sensor 38 connected to the bearing plate 36 monitors the sand and transmits the signal to the peripheral terminal. The peripheral terminal receives the signal and controls the secondary solenoid valve 35 to close and the drive motor 311 to open. The drive motor 311 drives the output shaft to rotate, thereby rotating the vertical plate 310 and the intermediate plate 18 by 180°, so that the sandbag 21 is once again at the bottom of the intermediate plate 18.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A casting apparatus for ductile iron castings, comprising a casting table (1), characterized in that, A placement box (11) is provided in the middle of the top of the casting table (1). The placement box (11) has a U-shaped structure. The placement box (11) is symmetrically connected with baffle plates (12) at the front and back. A set of baffle plates (12) is connected to a vibration motor (13) on the side away from the placement box (11). A lower sand box (14) is provided in the middle of the bottom surface of the inner cavity of the placement box (11). An upper sand box (15) is provided on the top of the lower sand box (14). A feed pipe (16) is connected in the middle of the top of the upper sand box (15). A cover (17) is connected to the top of the feed pipe (16). An intermediate plate (18) is provided above the upper sand box (15). The intermediate plate (18) slides with the inner wall of the placement box (11). A through hole (19) is opened in the middle of the intermediate plate (18). The component (18) is provided with an air guiding module (2), which includes a sandbag (21) and an air pump (22). The sandbag (21) is symmetrically connected to the bottom of the intermediate plate (18). The air pump (22) is connected to the middle of one side of the top of the intermediate plate (18) by a positioning bolt. The top of the intermediate plate (18) is provided with a sand inlet module (3), which includes a sand storage cover (31). The sand storage cover (31) is connected to the top of the intermediate plate (18). The top of the casting table (1) is provided with a lifting module (4), which includes a top plate (41) and an electric telescopic rod (42). The top plate (41) is located above the sand storage cover (31), and the electric telescopic rod (42) is connected to the middle of the top of the top plate (41).

2. The casting apparatus for ductile iron castings according to claim 1, characterized in that: The air guiding module (2) also includes a square slot (23), a filter screen (24), a conduit (25) and a first-stage solenoid valve (26). The square slot (23) is symmetrically opened on both sides of the bottom of the intermediate plate (18). The square slot (23) is connected to the inner cavity of the sandbag (21). The filter screen (24) is located in the square slot (23) and is connected to the intermediate plate (18). The conduit (25) is symmetrically connected to both sides of the air pump (22). The end of the conduit (25) away from the air pump (22) passes through the intermediate plate (18) and is connected to the square slot (23). The first-stage solenoid valve (26) is located on the conduit (25). A pressure gauge is installed on the conduit (25).

3. The casting apparatus for ductile iron castings according to claim 1, characterized in that: The sand inlet module (3) also includes a primary circular groove (32), a secondary circular groove (33), a sand inlet pipe (34), and a secondary solenoid valve (35). The primary circular groove (32) is symmetrically opened on both sides of the bottom of the intermediate plate (18), and the secondary circular groove (33) is symmetrically opened on both sides of the top of the intermediate plate (18). The secondary circular groove (33) is connected to the primary circular groove (32). The sand inlet pipe (34) is located in the primary circular groove (32), and the top of the sand inlet pipe (34) passes through the primary circular groove (32) and the secondary circular groove (33) in sequence. The bottom of the sand inlet pipe (34) is connected to the inner cavity of the sandbag (21). The secondary solenoid valve (35) is located on the sand inlet pipe (34) and is located in the secondary circular groove (33).

4. The casting apparatus for ductile iron castings according to claim 3, characterized in that: The sand inlet module (3) also includes a support plate (36), a three-stage circular groove (37), a pressure sensor (38), and a cylinder (39). The support plate (36) is slidably fitted inside the sand storage hood (31), and two sets of support plates (36) are symmetrically arranged vertically. The three-stage circular groove (37) is symmetrically opened on both sides of the lower support plate (36), and the three-stage circular groove (37) penetrates vertically through the lower support plate (36). The top end of the sand inlet pipe (34) is slidably fitted inside the three-stage circular groove (37). The pressure sensor (38) is symmetrically arranged vertically on both sides of the inner cavity of the sand storage hood (31), and the pressure sensor (38) located on the lower side has two vertically arranged vertically. The sides are connected to the lower support plate (36) and the middle plate (18) respectively. The upper pressure sensor (38) is connected to the top surface of the inner cavity of the sand storage cover (31) and the upper support plate (36) respectively. The cylinder (39) is connected to the top of the middle plate (18), and the circular hole (19) is connected to the inner cavity of the cylinder (39). The top of the cylinder (39) passes through the lower support plate (36), the upper support plate (36) and the sand storage cover (31) in sequence. The outer wall of the cylinder (39) is slidably engaged with the two sets of support plates (36), and the top of the outer wall of the cylinder (39) is connected to the sand storage cover (31).

5. The casting apparatus for ductile iron castings according to claim 1, characterized in that: The sand inlet module (3) also includes a vertical plate (310), a drive motor (311) and a rotating shaft (312). The vertical plate (310) is symmetrically connected to the top two sides of the middle plate (18). The drive motor (311) is located on one side of the vertical plate (310) and the output shaft of the drive motor (311) is connected to the vertical plate (310). The rotating shaft (312) is connected to the other side of the vertical plate (310).

6. The casting apparatus for ductile iron castings according to claim 5, characterized in that: The lifting module (4) also includes a support rod (43) and a connecting cover (44). The support rod (43) is connected to the four corners of the top of the casting table (1), and the top of the support rod (43) is connected to the top plate (41). The connecting cover (44) is located below the top plate (41), and the output end of the bottom of the electric telescopic rod (42) passes through the top plate (41) and is connected to the middle of the top of the connecting cover (44). The connecting cover (44) has a U-shaped structure. Both sets of vertical plates (310) are inside the connecting cover (44). The output shaft of the drive motor (311) passes through one end of the connecting cover (44), and the outer wall of the output shaft of the drive motor (311) slides with the connecting cover (44). The drive motor (311) is connected to the connecting cover (44) through a positioning bolt. The end of the rotating shaft (312) away from the vertical plate (310) is connected to the bearing of the connecting cover (44).

7. The casting apparatus for ductile iron castings according to claim 1, characterized in that: The lifting module (4) also includes a primary outer cover (45), a reset spring (46) and a bottom ring (47). The primary outer cover (45) and the bottom ring (47) are both sleeved on the outside of the feed pipe (16), and the top of the primary outer cover (45) is connected to the middle plate (18). The inner cavity of the primary outer cover (45) is connected to the round hole (19). The reset spring (46) is symmetrically connected to both sides of the bottom of the primary outer cover (45), and the bottom end of the reset spring (46) is connected to the bottom ring (47).

8. The casting apparatus for ductile iron castings according to claim 7, characterized in that: The lifting module (4) also includes a secondary outer cover (48), a limiting slot (49) and a limiting block (410). The secondary outer cover (48) is slidably sleeved on the outer wall of the primary outer cover (45), and the outer wall of the bottom ring (47) is connected to the bottom of the inner wall of the secondary outer cover (48). The limiting slot (49) is symmetrically opened on both sides of the inner wall of the secondary outer cover (48). The limiting block (410) is slidably fitted in the limiting slot (49), and the limiting block (410) is connected to the bottom of the outer wall of the primary outer cover (45).

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