Casting equipment for high-toughness aluminum alloy end cover of pump body of magnetic suspension vacuum pump

Abstract

The invention relates to the technical field of casting modeling, and discloses magnetic suspension vacuum pump body high-toughness aluminum alloy end cover casting equipment which comprises a jolt ramming table and a sand box body arranged at the top of the jolt ramming table, a fixed bottom plate is arranged in the sand box body, and a slidable lifting box is arranged at the bottom of the fixed bottom plate; a plurality of positioning rods are elastically installed in the lifting box, first through holes allowing the positioning rods to pass through are formed in the top face of the fixed bottom plate, the rod walls of the positioning rods are slidably attached to the inner walls of the first through holes, and the top ends of the positioning rods are arranged in an arc mode. According to the device, the bottom of the white mold in an irregular shape is attached to the outline of the positioning rod array, the placing stability of the white mold in the irregular shape is guaranteed, compared with a traditional manual sand padding fixing mode, the defects of cold shut and insufficient pouring caused by inclination of the white mold are fundamentally overcome, and the equipment adaptability and the production efficiency are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of casting molding, in particular to a high-toughness aluminum alloy end cover casting device for a magnetic levitation vacuum pump body. Background Art

[0002] With the rapid development of high-end manufacturing, precision equipment such as magnetic levitation vacuum pumps is placing increasingly stringent demands on the lightweight, high-strength, and high-toughness of core components. Key structural components, such as pump end covers, must not only maintain both structural load-bearing capacity and dynamic stability under extreme operating conditions, but also utilize advanced, high-strength, lightweight aluminum alloys to reduce overall weight and improve operational efficiency.

[0003] Lost foam casting, a representative process of green casting in the 21st century, has become a key technology for the precision molding of complex structural parts in intelligent casting islands due to its near-net-shape and high process flexibility. This process digitally prepares foam white molds through processes such as 3D scanning, topology optimization, and CNC machining. It then uses dry sand vibration molding and negative pressure pouring to precisely shape metal parts.

[0004] This process buries a foam white mold coated with a refractory coating in dry sand without a binder. When high-temperature molten metal is poured, the model vaporizes and disappears. The molten metal occupies the space in the model and solidifies to form a casting. Compared with traditional sand casting, this technology has significant advantages: high dimensional accuracy of castings, simplified production process, and low environmental pollution.

[0005] Currently, the initial positioning and stabilization of the blank mold primarily rely on manual adjustment and sand clamping. Blank molds with irregular shapes, offset centers of gravity, or multiple curved bottom surfaces, such as the end cap blank mold for a magnetic levitation vacuum pump body, are often secured by manual sand padding and temporary supports. This traditional method is not only cumbersome and unstable, but can also easily cause the blank mold to shift, tilt, or even become unstable during subsequent steps such as sand filling and molten metal pouring. Due to the diverse postures of the blank mold, in actual production, the blank mold is prone to tilting or shifting, causing turbulent molten metal during mold filling, leading to quality issues such as cold shuts and insufficient mold filling in the casting, as well as loose sand or voids at the bottom of the blank mold that cannot be filled in time, affecting the surface quality of the final product. Summary of the Invention

[0006] In view of the problems in the existing technology that the white mold is easy to tilt or deflect, causing turbulence of the metal liquid during filling, resulting in cold shut and insufficient filling of the casting, and the problems that the sand body at the bottom of the white mold is loose or the gaps cannot be filled in time, affecting the surface quality of the final product, a high-toughness aluminum alloy end cover casting equipment for the pump body of a magnetic levitation vacuum pump is proposed.

[0007] The present application provides a high-toughness aluminum alloy end cover casting device for a magnetic levitation vacuum pump body, the purpose of which is to achieve adaptive precise positioning and stabilization of irregular white molds, and adaptively hide the positioning rod during the sand filling process to improve the stability of the lost foam casting process and the quality of the castings.

[0008] The technical solution of the present invention is: a high-toughness aluminum alloy end cover casting device for a magnetic levitation vacuum pump body, comprising a vibrating table and a sand box body arranged on the top of the vibrating table, a fixed bottom plate is arranged inside the sand box body, a slidable lifting box is arranged at the bottom of the fixed bottom plate, a plurality of positioning rods are elastically installed inside the lifting box, a first through hole for the positioning rod to pass through is opened on the top surface of the fixed bottom plate, and the rod wall of the positioning rod is slidably fitted with the inner wall of the first through hole, and the top end of the positioning rod is set in an arc.

[0009] Furthermore, a disc is provided at the bottom end of the positioning rod, a folding air cylinder is provided on the bottom surface of the disc, a first elastic member is sleeved on the outside of the folding air cylinder, and one end of the first elastic member is fixedly connected to the bottom surface of the disc, and the other end of the first elastic member is fixedly connected to the bottom surface of the inner wall of the lifting box; an air bag is provided at the bottom of the lifting box, and ventilation holes are provided on the bottom surface of the lifting box, the number of ventilation holes corresponds to the number of folding air cylinders, an air pipe is inserted at the bottom of the air bag, and the interior of the folding air cylinder is connected to the interior of the air bag through the ventilation holes.

[0010] Furthermore, a sealing cover is provided at one end of the trachea away from the airbag.

[0011] Furthermore, a first spring sheet is provided on the side wall of the lifting box, and a second spring sheet corresponding to the first spring sheet is provided on the inner wall of the sand box body; a roller is provided on the side wall of the lifting box, and a slide rail for the roller to rotate is provided on the inner wall of the sand box body; a damper is provided on the top surface of the compaction table, and a tension spring is provided on the outer sleeve of the damper, and the movable end of the damper is fixedly connected to the bottom surface of the lifting box, one end of the tension spring is fixedly connected to the bottom surface of the lifting box, and the other end of the tension spring is fixedly connected to the top surface of the compaction table.

[0012] Furthermore, a control plate is elastically installed on the top of the fixed base plate, and a second air hole for the positioning rod to pass through is provided on the top surface of the control plate, and a pressing hole for the pressing rod to be inserted is provided on the bottom surface of the control plate, and the outer wall of the control plate is slidably fitted with the inner wall of the sand box body, and the rod wall of the positioning rod is slidably fitted with the inner wall of the second air hole. When the molding sand is filled, the control plate can be pressed to slide down. When the molding sand is filled to a certain weight, the bottom end of the pressing rod pushes the lifting box to move down, and the lifting box drives several positioning rods to move down synchronously.

[0013] Furthermore, a second elastic member is provided between the control board and the fixed base plate.

[0014] Furthermore, a groove is provided on the top surface of the fixed bottom plate, a sleeve is provided on the bottom surface of the inner wall of the groove, an internal thread is provided on the inner wall of the sleeve, a sliding cylinder is provided inside the sleeve, and an external thread matching the internal thread is provided on the outer wall of the sliding cylinder. A limiting hole is provided on the top surface of the sliding cylinder, and one end of the second elastic member is fixedly connected to the bottom surface of the control plate, and the other end of the second elastic member is fixedly connected to the top surface of the sliding cylinder, and the pushing rod slides inside the limiting hole; the inner wall of the sand box body is provided with a stop plate for limiting the height of the control plate.

[0015] Furthermore, the outer wall of the sleeve is provided with a plurality of rotation holes, the outer wall of the fixed bottom plate is provided with a first through slot corresponding to the rotation holes, and the outer wall of the sand box body is provided with a second through slot corresponding to the first through slot.

[0016] Furthermore, a pull rod is provided on the side wall of the lifting box, a third through slot for the pull rod to slide is opened on the outer wall of the sand box body, and one end of the air pipe away from the air bag passes through the third through slot.

[0017] Beneficial effects of the present invention:

[0018] 1. When the white mold is placed, its gravity presses the positioning rod downward, driving the folding air cylinder to compress and discharge the internal air through the air pipe. When the sealing cover closes the air pipe, the positioning rod system forms a closed air-blocking environment. Under the action of the air pressure difference, all the positioning rods are rigidly locked. This design makes irregular-shaped white molds such as impellers and cylinder bottoms fit the contour of the positioning rod array, ensuring the stability of the placement of irregular-shaped white molds. Compared with the traditional manual sand padding and fixing method, this fundamentally eliminates defects such as cold shut and insufficient pouring caused by white mold tilt. Especially for white molds with offset center of gravity, this design can automatically compensate for the force difference of each positioning rod, ensuring the full circumferential stability of complex structures.

[0019] 2. When the molding sand is filled to a critical weight, the control panel is pressed down, and the top pressure rod drives the lifting box to separate from the first spring plate and the second spring plate. Under the control of the tension spring and the damper, the positioning rod slowly descends to ensure that the positioning rod begins to hide when the sand can flow to fill the gap. At the same time, it can prevent the positioning rod from retracting rapidly and disturbing the white mold. The vibration table vibrates synchronously to make the sand fill the gap in real time, and the positioning rod can eventually be completely hidden in the first through hole. The arc at the top guides the sand flow to cover it, avoiding the positioning rod from affecting the casting process.

[0020] 3. By inserting an external straight rod into the rotating hole to drive the sleeve to rotate, the preload force of the second elastic member can be precisely set, thereby adapting to different working conditions and synchronously compensating for differences in sand mold density, such as between pearl sand and quartz sand, as well as fluctuations in vibration intensity. This ensures that the positioning rod is completely hidden when the sand is filled to the optimal time, the gap can be filled, and the white mold is stable, fundamentally eliminating the iron-encased sand defect at the bottom of the casting and the problem of gate deflection. In addition, this design can also quickly compensate for the stiffness attenuation caused by fatigue of the second elastic member, significantly improving equipment adaptability and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation of the sand box body in the present invention;

[0023] Figure 3 Schematic diagram of the interior of the flask body of the present invention;

[0024] Figure 4 For the present invention Figure 3 A magnified schematic diagram of point A in the middle;

[0025] Figure 5 Schematic diagram of the installation of the positioning rod in the present invention;

[0026] Figure 6 Schematic diagram of the installation of the push rod in the present invention;

[0027] Figure 7 This is a schematic diagram of the interior of the lifting box of the present invention;

[0028] Figure 8 For the present invention Figure 7 A magnified schematic diagram of point B in the middle;

[0029] Figure 9 This is a schematic diagram of the installation of the sliding cylinder in the present invention;

[0030] Figure 10 It is a three-dimensional diagram of the fixed base plate in the present invention.

[0031] In the picture:

[0032] 1. Vibrating table; 2. Sand box body; 3. Fixed bottom plate; 4. Lifting box; 5. Positioning rod; 6. Disc; 7. First elastic member; 8. First through hole; 9. Air bag; 10. Air pipe; 11. Folding air cylinder; 12. Vent hole; 13. Sealing cover; 14. Control panel; 15. Second air hole; 16. Second elastic member; 17. Pressing rod; 18. Pressing hole; 19. First spring; 20. Second spring; 21. Roller; 22. Slide rail; 23. Tension spring; 24. Damper; 25. Groove; 26. Sleeve; 27. Sliding cylinder; 28. External thread; 29. ​​Internal thread; 30. Rotating hole; 31. Limiting hole; 32. First through slot; 33. Second through slot; 34. Pull rod; 35. Third through slot; 36. Abutment plate. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Example 1, reference Figures 1-10 , which is the first embodiment of the present invention, provides: a high-toughness aluminum alloy end cover casting device for a magnetic levitation vacuum pump body, comprising a vibration table 1 and a sand box body 2 fixedly installed on the top of the vibration table 1, a fixed bottom plate 3 is fixedly installed inside the sand box body 2, a slidable lifting box 4 is provided at the bottom of the fixed bottom plate 3, a plurality of positioning rods 5 are elastically installed inside the lifting box 4, a first through hole 8 for the positioning rod 5 to pass through is opened on the top surface of the fixed bottom plate 3, and the rod wall of the positioning rod 5 is slidably fitted with the inner wall of the first through hole 8, and the top end of the positioning rod 5 is set in an arc shape.

[0035] Specifically, the vibrating table 1 serves as a basic vibrating component. During the molding sand filling process, it can fully vibrate the molding sand poured into the sand box body 2 through continuous small-amplitude vibration, thereby improving the compactness of the molding sand and ensuring the stability of the sand mold structure. On the other hand, after the positioning rod 5 is lowered, the gap originally occupied by the positioning rod 5 can be quickly filled to avoid the appearance of voids in the sand mold, providing a uniform and dense molding environment for the subsequent molten metal casting of the high-toughness aluminum alloy end cover of the magnetic levitation vacuum pump pump body, thereby effectively ensuring the molding quality of the casting. The positioning rod 5 is the core component for realizing adaptive fixation of irregular white molds. The arc setting at its top has dual advantages. First, it can effectively prevent the positioning rod 5 from causing scratches or extrusion damage to the surface of the white mold during vibration, thereby protecting the geometric shape accuracy of the white mold; second, when the molding sand falls to the top of the positioning rod 5, it can flow to the surroundings and will not accumulate at the top, thereby reducing the molding sand accumulation time and thus shortening the overall duration of the sand filling vibration. The elastic installation design of several positioning rods 5 can adaptively move downward according to the shape of the white mold, thereby realizing multi-point support and fixation of the white mold, greatly improving the stability of the fixation of the irregular shaped white mold.

[0036] Reference Figure 5-Figure 8 The bottom end of the positioning rod 5 is fixedly mounted with a disc 6, and the bottom surface of the disc 6 is fixedly mounted with a folding air cylinder 11. The outside of the folding air cylinder 11 is sheathed with a first elastic member 7, and one end of the first elastic member 7 is fixedly connected to the bottom surface of the disc 6, and the other end of the first elastic member 7 is fixedly connected to the bottom surface of the inner wall of the lifting box 4; the bottom of the lifting box 4 is fixedly mounted with an air bag 9, and the bottom surface of the lifting box 4 is provided with vent holes 12, the number of vent holes 12 corresponds to the number of folding air cylinders 11, and the bottom of the air bag 9 is plugged with an air pipe 10, and the interior of the folding air cylinder 11 is connected to the interior of the air bag 9 through the vent holes 12. A sealing cover 13 is provided at the end of the air pipe 10 away from the air bag 9.

[0037] Specifically, the first elastic member 7 can be a compression spring or a return spring commonly used in the prior art, and preferably a compression spring here. The first elastic member 7 is compressed when the positioning rod 5 is pressed downward by the white mold, providing an upward elastic support force for the positioning rod 5. When the white mold is removed, the positioning rod 5 can be automatically reset under the action of its elastic force, which is convenient for the next casting operation of this device. The folding air cylinder 11 is compressed and folded as the positioning rod 5 moves downward, and the internal air enters the air bag 9 through the vent 12 and is then discharged through the air pipe 10, thereby realizing air pressure regulation during the downward movement of the positioning rod 5. The threaded connection design of the sealing cover 13 and the air pipe 10 is convenient to operate and has reliable sealing. After the white mold is placed, the air pipe 10 is sealed to form a closed space inside the air bag 9 and the folding air cylinder 11. The position of the positioning rod 5 is stabilized by air pressure, which further strengthens the fixed stability of the white mold during the sand filling process and effectively prevents the white mold from tilting.

[0038] Reference Figure 3-Figure 4 A first elastic piece 19 is fixedly installed on the side wall of the lifting box 4, and a second elastic piece 20 corresponding to the first elastic piece 19 is fixedly installed on the inner wall of the sand box body 2; a roller 21 is rotatably installed on the side wall of the lifting box 4, and a slide rail 22 for the roller 21 to rotate is fixedly installed on the inner wall of the sand box body 2; a damper 24 is fixedly installed on the top surface of the compacting table 1, and a tension spring 23 is provided on the outside of the damper 24, and the movable end of the damper 24 is fixedly connected to the bottom surface of the lifting box 4, one end of the tension spring 23 is fixedly connected to the bottom surface of the lifting box 4, and the other end of the tension spring 23 is fixedly connected to the top surface of the compacting table 1.

[0039] Specifically, the cooperation between the roller 21 and the slide rail 22 significantly reduces the friction resistance of the lifting box 4 during sliding, making the lifting and lowering movement of the lifting box 4 smoother and more stable. At the same time, the guiding effect of the two ensures that the lifting box 4 will not deviate or shake during the sliding process, thereby improving the stability and accuracy of the movement of the lifting box 4 and extending the service life of the equipment. The tension spring 23 is stretched and stores elastic force when the lifting box 4 rises. When the first spring piece 19 separates from the second spring piece 20, its elastic force provides power for the lifting box 4 to descend. The damper 24 provides a damping effect during the descent of the lifting box 4, and cooperates with the elastic force of the tension spring 23 to enable the lifting box 4 to drive the positioning rod 5 to slowly descend, thereby avoiding the impact or damage to the white mold caused by the rapid downward movement of the positioning rod 5, thereby ensuring the safety and stability of the casting process.

[0040] Reference Figure 3-10A control plate 14 is elastically installed on the top of the fixed base plate 3. A second air hole 15 is provided on the top surface of the control plate 14 for the positioning rod 5 to pass through. A top pressure hole 18 is provided on the bottom surface of the control plate 14 for the pushing rod 17 to be inserted. The outer wall of the control plate 14 slides in contact with the inner wall of the sand box body 2, and the rod wall of the positioning rod 5 slides in contact with the inner wall of the second air hole 15. When the molding sand is filled, the control plate 14 can be pressed to slide down. When the molding sand is filled to a certain weight, the bottom end of the pushing rod 17 pushes the lifting box 4 to move down, and the lifting box 4 drives several positioning rods 5 to move down synchronously.

[0041] Specifically, the control plate 14 carries the white mold and transfers the weight of the molding sand. When the molding sand is filled to a certain weight, the control plate 14 descends to the top surface of the fixed base plate 3, triggering the descending mechanism of the positioning rod 5. The second air hole 15 on the control plate 14 is still in a blocked state when the positioning rod 5 descends to the lowest position, effectively preventing the molding sand from falling from the second air hole 15, ensuring the integrity of the sand mold structure, and avoiding molding sand waste and sand mold defects.

[0042] Reference Figures 5-10 A second elastic member 16 is disposed between the control plate 14 and the fixed base plate 3. A groove 25 is formed on the top surface of the fixed base plate 3. A sleeve 26 is rotatably mounted on the bottom surface of the inner wall of the groove 25. The inner wall of the sleeve 26 is provided with an internal thread 29. A sliding cylinder 27 is disposed within the sleeve 26. The outer wall of the sliding cylinder 27 is provided with an external thread 28 that matches the internal thread 29. A limit hole 31 is defined on the top surface of the sliding cylinder 27. One end of the second elastic member 16 is fixedly connected to the bottom surface of the control plate 14, and the other end of the second elastic member 16 is fixedly connected to the top surface of the sliding cylinder 27. The push rod 17 slides within the limit hole 31. A stop plate 36 for limiting the height of the control plate 14 is fixedly mounted on the inner wall of the flask body 2. The outer wall of the sleeve 26 is provided with several rotation holes 30. The outer wall of the fixed base plate 3 is provided with a first through-slot 32 corresponding to the rotation holes 30. The outer wall of the flask body 2 is provided with a second through-slot 33 corresponding to the first through-slot 32.

[0043] Specifically, the second elastic member 16 can be a compression spring or a return spring commonly used in the prior art, and a compression spring is preferably used here. By adjusting the matching position of the sleeve 26 and the sliding cylinder 27 through an external straight long rod, the preload force of the second elastic member 16 can be accurately set, so that the equipment can adapt to white molds of different weights and shapes and different types of molding sand (such as gem sand and quartz sand), thereby enhancing the adaptability of the equipment to different working conditions. At the same time, the preload force adjustable mechanism can quickly compensate for the stiffness attenuation of the second elastic member 16 due to fatigue, extend the service life of the components, and improve the production efficiency of the equipment. This equipment uses a mechanical structure to replace a complex electronic control system, which not only reduces the manufacturing cost of the equipment, but also reduces the risk of circuit failure, and significantly improves the reliability of the equipment operation.

[0044] Reference Figure 1A pull rod 34 is fixedly installed on the side wall of the lifting box 4, and a third through groove 35 for sliding the pull rod 34 is opened on the outer wall of the sand box body 2, and the end of the air pipe 10 away from the air bag 9 passes through the third through groove 35.

[0045] Specifically, the staff can easily control the lifting box 4 to slide upward by pulling the pull rod 34 without the help of additional tools, which simplifies the operation process of the equipment and reduces the intensity of manual operation.

[0046] Working principle: When it is necessary to place the white mold of the high-toughness aluminum alloy end cover of the magnetic levitation vacuum pump body into the sand box body 2, the staff first slides the lifting box 4 upward through the pull rod 34 until the first spring piece 19 and the second spring piece 20 are engaged together, and removes the sealing cover 13 from the air pipe 10. It should be noted that the first spring piece 19 and the second spring piece 20 are both hollow hemispherical spring pieces, which can temporarily fix the position of the pull rod 34. During the sliding process of the lifting box 4, the cooperation between the roller 21 and the slide rail 22 can improve the stability of the lifting box 4 during sliding. At the same time, the tension spring 23 is stretched to generate elastic force, and the top ends of several positioning rods 5 extend above the control panel 14.

[0047] Then, the staff places the white mold on several positioning rods 5. Under the action of the gravity of the white mold, some positioning rods 5 can be pressed downward according to the shape of the white mold. The downward movement of some positioning rods 5 can drive part of the first elastic member 7 and the folding air cylinder 11 to be compressed and folded. Subsequently, excess air is discharged through the vent 12, the air bag 9 and the trachea 10. After all the white molds are placed, the sealing cover 13 is re-fixed on the trachea 10. The sealing cover 13 and the trachea 10 can be threadedly connected. After the air outlet end of the trachea 10 is sealed by the sealing cover 13, the positions of several positioning rods 5 are relatively fixed, which further enhances the stability of the irregular-shaped white mold when it is fixed during the sand filling process, and is less likely to tilt.

[0048] Then the molding sand can be poured into the sand box, and the vibrating table 1 vibrates at the same time. As the poured molding sand becomes more and more heavy, the control board 14 drops to the top surface of the fixed bottom plate 3. At the same time, the bottom end of the pressure rod 17 pushes the lifting box 4 down, and the first spring piece 19 separates from the second spring piece 20. Under the action of the elastic force of the tension spring 23 and the damping of the damper 24, the lifting box 4 synchronously drives several positioning rods 5 to slowly drop down, so as to avoid the positioning rods 5 affecting the white mold during the casting process. Finally, under the action of the vibration of the vibrating table 1, the gap of the original positioning rod 5 can be filled. It should be noted that when the lifting box 4 drops to the lowest position, the top end of the positioning rod 5 is located inside the second air hole 15, and the second air hole 15 is still in a blocked state. The molding sand on the control board 14 will not fall from the second air hole 15.

[0049] After the molding sand is filled, the high-temperature molten metal is poured into the white mold gate. The high-temperature molten metal instantly vaporizes and decomposes when it contacts the white mold. After the molten metal cools in the dry sand mold, it can accurately replicate the geometric shape of the white mold to form a net-shape casting without burrs and draft angles. After the casting is completed, the casting and the molding sand are taken out, and the sealing cover 13 is opened. Under the action of the elastic force of the first elastic member 7, part of the positioning rod 5 can be driven to move up again, and the lifting box 4 can be slid up to the initial position, and the next casting can be cast again.

[0050] In addition, by using an external straight long rod to extend into the second through slot 33 and the first through slot 32, the staff can make the end of the straight long rod extend into the interior of the rotating hole 30, and then can drive the sleeve 26 to rotate through several rotating holes 30. The rotation of the sleeve 26 can drive the sliding cylinder 27 to rise and fall. Combined with the height limit of the control plate 14 by the abutment plate 36, the preload force of the second elastic member 16 can be accurately set, so that it can adapt to different working conditions, synchronously compensate for the difference in sand mold density (such as gem sand and quartz sand) and vibration intensity fluctuations, and ensure that the positioning rod 5 is completely hidden when the molding sand is filled to the best time (when the gap can be filled and the white mold is stable), fundamentally eliminating the iron-coated sand defects at the bottom of the casting and the gate deflection problem.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-toughness aluminum alloy end cover casting device for a magnetic levitation vacuum pump body, comprising a vibration compaction table (1) and a sand box body (2) arranged on the top of the vibration compaction table (1), characterized in that: A fixed bottom plate (3) is provided inside the sand box body (2), a slidable lifting box (4) is provided at the bottom of the fixed bottom plate (3), a plurality of positioning rods (5) are elastically installed inside the lifting box (4), a first through hole (8) for the positioning rod (5) to pass through is opened on the top surface of the fixed bottom plate (3), and the rod wall of the positioning rod (5) is slidably fitted with the inner wall of the first through hole (8), and the top end of the positioning rod (5) is arranged in an arc shape.

2. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 1 is characterized in that: A disc (6) is provided at the bottom end of the positioning rod (5), a folding air cylinder (11) is provided on the bottom surface of the disc (6), a first elastic member (7) is sleeved on the outside of the folding air cylinder (11), and one end of the first elastic member (7) is fixedly connected to the bottom surface of the disc (6), and the other end of the first elastic member (7) is fixedly connected to the bottom surface of the inner wall of the lifting box (4); An air bag (9) is provided at the bottom of the lifting box (4), and ventilation holes (12) are provided on the bottom surface of the lifting box (4). The number of ventilation holes (12) corresponds to the number of folding air cylinders (11). An air tube (10) is inserted into the bottom of the air bag (9), and the interior of the folding air cylinder (11) is connected to the interior of the air bag (9) through the ventilation holes (12).

3. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 2 is characterized in that: A sealing cover (13) is provided at one end of the trachea (10) away from the air bag (9).

4. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 1 is characterized in that: The side wall of the lifting box (4) is provided with a first elastic piece (19), and the inner wall of the sand box body (2) is provided with a second elastic piece (20) corresponding to the first elastic piece (19); The side wall of the lifting box (4) is provided with a roller (21), and the inner wall of the sand box body (2) is provided with a slide rail (22) for the roller (21) to rotate; The top surface of the vibration table (1) is provided with a damper (24), the outer sleeve of the damper (24) is provided with a tension spring (23), and the movable end of the damper (24) is fixedly connected to the bottom surface of the lifting box (4), one end of the tension spring (23) is fixedly connected to the bottom surface of the lifting box (4), and the other end of the tension spring (23) is fixedly connected to the top surface of the vibration table (1).

5. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 4 is characterized in that: A control plate (14) is elastically mounted on the top of the fixed bottom plate (3); a second air hole (15) for the positioning rod (5) to pass through is provided on the top surface of the control plate (14); a top pressure hole (18) for the top pressure rod (17) to be inserted is provided on the bottom surface of the control plate (14); the outer wall of the control plate (14) is slidably fitted with the inner wall of the sand box body (2); the rod wall of the positioning rod (5) is slidably fitted with the inner wall of the second air hole (15); when the molding sand is filled, the control plate (14) can be pressed to slide down; when the molding sand is filled to a certain weight, the bottom end of the top pressure rod (17) pushes the lifting box (4) to move downward, and the lifting box (4) drives a plurality of positioning rods (5) to move downward synchronously.

6. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 5 is characterized in that: A second elastic member (16) is provided between the control plate (14) and the fixed base plate (3).

7. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 6 is characterized in that: The top surface of the fixed base plate (3) is provided with a groove (25), the bottom surface of the inner wall of the groove (25) is provided with a sleeve (26), the inner wall of the sleeve (26) is provided with an internal thread (29), a sliding cylinder (27) is provided inside the sleeve (26), the outer wall of the sliding cylinder (27) is provided with an external thread (28) adapted to the internal thread (29), a limiting hole (31) is provided on the top surface of the sliding cylinder (27), and one end of the second elastic member (16) is fixedly connected to the bottom surface of the control plate (14), and the other end of the second elastic member (16) is fixedly connected to the top surface of the sliding cylinder (27), and the pressing rod (17) slides inside the limiting hole (31); The inner wall of the flask body (2) is provided with a stop plate (36) for limiting the height of the control plate (14).

8. The high-toughness aluminum alloy end cover casting equipment for the magnetic levitation vacuum pump body according to claim 7 is characterized in that: The outer wall of the sleeve (26) is provided with a plurality of rotation holes (30), the outer wall of the fixed base plate (3) is provided with a first through groove (32) corresponding to the rotation holes (30), and the outer wall of the sand box body (2) is provided with a second through groove (33) corresponding to the first through groove (32).

9. The high-toughness aluminum alloy end cover casting equipment for a magnetic levitation vacuum pump body according to claim 1, characterized in that: The side wall of the lifting box (4) is provided with a pull rod (34), the outer wall of the sand box body (2) is provided with a third through groove (35) for the pull rod (34) to slide, and the end of the air pipe (10) away from the air bag (9) passes through the third through groove (35).

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