A flexible system for sharing multiple crucibles for low-pressure investment casting

Abstract

The present invention discloses a flexible system for sharing multiple crucibles for low-pressure investment casting, which solves the limitations of existing equipment and realizes large-scale, large-piece (single piece can reach one ton), and multi-variety sharing. It includes multiple crucibles and an operating table, on which a substrate for mounting a casting mold is provided, and the substrate has a avoidance hole, and the crucibles are all arranged below the operating table; it also includes a positioning unit, which is used to move a single crucible to the bottom of the substrate, and a lifting device is provided in the positioning unit to lift the crucible under the substrate until the upper end of the liquid riser of the crucible is inserted into the avoidance hole, and the upper end of the avoidance hole is flush with the upper side of the substrate; it also includes a fixed mold unit, which includes a pressure plate for setting the casting mold, the pressure plate is located above the substrate, and a lifting device is provided to control the lifting of the pressure plate.

Description

Technical Field

[0001] The invention relates to an investment casting technology, in particular to a multi-crucible shared flexible system for investment low-pressure casting. Background Art

[0002] In the current factory production, especially for complex aluminum alloy aviation castings, the structure is complex, the size and X-ray level requirements are very high, and the existing methods are inefficient. And the quality is difficult to meet the needs of users. Some aluminum alloy aviation castings with complex structures have complex structures. When using investment casting and sand casting, the casting time is long due to the lack of casting pressure. The long casting time leads to poor product quality, low pass rate, and poor economic benefits. At the same time, the demand for product output is large, but the specification difference is obvious, and the investment mold or resin sand mold needs to be replaced frequently. Low-pressure aluminum alloy casting effectively improves the quality of investment casting. For the diversification of products and casting methods, but the filtrate requirements are different, the original equipment needs to be replaced more frequently, resulting in greater difficulty in operation and inconvenient operation. Then the mold set for casting needs to be pressured and stabilized during the casting process to prevent the investment shell (mold) from tilting during the casting process and causing gunfire, and the investment shell and resin sand molds cannot be over-pressurized during the pressure application process, otherwise the mold will be crushed or cracked. The cracked mold will produce unqualified products, etc. The above improvements will appear urgent for these series.

[0003] The present invention realizes a multi-crucifix interchangeable and multi-variety mass production sharing system. The technical key point is to interchange three crucibles of 500 kg, 1000 kg and 1500 kg set under the operating platform. Thus, the design solves the limitations of existing equipment and realizes a mass, large-scale (single piece can reach one ton), multi-variety shared operating system. Summary of the invention

[0004] The purpose of the present invention is to propose a flexible system for sharing multiple crucibles for low-pressure investment casting, which solves the limitations of existing equipment and realizes large-scale, large-piece (single piece can reach one ton), and multi-variety sharing. It can be applied to molds of different specifications and models, and ensures stable mold pressure during casting, reducing the generation of defective products.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A flexible system for sharing multiple crucibles for low-pressure investment casting comprises a plurality of crucibles and an operating table, wherein a base plate for mounting a casting mold is disposed on the operating table, the base plate has avoidance holes, and the crucibles are all disposed below the operating table; a positioning unit is further included, wherein the positioning unit is used to move a single crucible to be directly below the base plate, and a lifting device is disposed in the positioning unit to lift the crucible directly below the base plate until the upper end of the riser tube of the crucible is inserted into the avoidance hole, and the upper end of the avoidance hole is made flush with the upper side surface of the base plate; a fixed mold unit is further included, wherein the fixed mold unit comprises a pressure plate for setting the casting mold, the pressure plate is located directly above the base plate, and a lifting device is disposed to control the lifting and lowering of the pressure plate.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: a horizontal foundation is provided, pillars are provided on the foundation to support the operating table, and the base plate is provided in the middle position of the operating table.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the positioning unit includes a horizontally arranged track, the track is located under the operating table and extends to both sides of the operating table, a vehicle body that can slide along the track is arranged on the track, and a driving device is arranged on the vehicle body to control the movement of the vehicle body, the crucible is arranged on the vehicle body along the length direction of the track, the lifting device includes a first hydraulic cylinder vertically arranged on both sides of the track below the operating table, a lifting platform is fixedly arranged on the movable end of the first hydraulic cylinder, and rigidly connected support arms are arranged on both sides of the crucible, and when the vehicle body drives the crucible to the position of the lifting device during movement, the support arm is located directly above the lifting platform.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: the vehicle body includes a plurality of equidistantly arranged mobile units, the mobile unit includes a frame, the frame has a placing table, and a rotatable support shaft is arranged on the frame, a rigidly connected support wheel is arranged on the support shaft and supported on the track, a crucible is placed on the placing table and the crucibles are equidistantly arranged with the center distance of the liquid riser as a spacing, and the arrangement spacing of the crucibles is consistent with the arrangement spacing of the mobile units, adjacent mobile units of the vehicle body are connected by connecting arms, the driving device includes a driving motor, and the driving motor is arranged on at least one of the frames and is transmission-connected to the support shaft, a lifting and lowering positioning column is arranged directly below the operating table, and a second hydraulic cylinder is arranged to control the lifting and lowering of the positioning column, and at least one positioning column is arranged on each side of the length direction of the track, and the second hydraulic cylinder controls the lifting of the positioning column to intercept the frame by the upper end of the positioning column to limit the movement of the vehicle body.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: an adjustment platform is supported and arranged between different crucibles and the placement table to make the upper ports of the lifting tubes of different crucibles at the same horizontal height, the lifting device also includes a bottom beam, the lifting platform is located directly above the bottom beam, the first hydraulic cylinder is supported between the bottom beam and the lifting platform, and retractable guide columns are vertically arranged at both ends of the bottom beam to connect the lifting platform.

[0011] On the basis of the above scheme and as a preferred scheme of the above scheme: at least one travel switch is respectively arranged on both sides of the length direction of the track, the travel switch is arranged on the upper end of the positioning column, and the trigger device of the travel switch is directed to the direction of the positioning column on the opposite side, the first detection plate and the second detection plate are respectively arranged on the crucible, the second detection plate has a light hole in the middle, the first detection plate and the second detection plate are arranged in a straight line in the vertical direction, the two first detection plates are respectively arranged on the upper and lower sides of the second detection plate at equal intervals, and the distances from all the first detection plates and the second detection plates to the central axis of the liquid riser are the same, two vertically arranged first sensors are arranged on one side of the track, and two vertically arranged second sensors are arranged on the other side, and the first sensors and the second sensors are opposite to each other, and when the crucible is located directly below the substrate, the second detection plate and the first detection plate on the upper side are located between the first sensor and the second sensor and the second detection plate.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: the lifting device includes a guide pillar vertically fixed on the operating table, the pressure plate can be slidably arranged on the guide pillar along the guide pillar, the top of the guide pillar is supported by a mounting plate, a connecting plate is arranged between the mounting plate and the pressure plate, the connecting plate is rigidly connected to the pressure plate through a vertical connecting column, a push plate that can slide along the connecting column is arranged between the connecting plate and the pressure plate, a third hydraulic cylinder is arranged on the mounting plate to connect the connecting plate to control the up and down movement of the connecting plate, a fourth hydraulic cylinder is arranged on the connecting plate to connect the push plate to control the up and down movement of the push plate relative to the connecting plate, a plurality of guide holes are arranged on the pressure plate, and a plurality of vertical push rods are arranged to pass through the guide holes and be detachably connected to the push plate.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: a detachable positioning plate is arranged on the substrate, a mounting reference hole is provided in the middle of the positioning plate opposite to the avoidance hole, two first positioning holes are provided on the substrate, and two second positioning holes are provided on the positioning plate, the first positioning hole coincides with the second positioning hole, and a first positioning pin and a second positioning pin are respectively arranged and inserted from the second positioning hole into the first positioning hole to position the positioning plate and connect it to the substrate.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the push plate has a plurality of threaded holes opposite to the guide holes one by one, the push rod includes a connecting rod, the connecting rod passes through the guide hole and is detachably connected to the threaded hole by threaded engagement, the lower end of the connecting rod is slidably provided with a pressing sleeve along the length direction, a first rest platform is provided on the outer side of the pressing sleeve, and a second rest platform is provided on the inner side, the lower end of the connecting rod passes through the lower side of the second rest platform and a stopper rigidly connected to the connecting rod is provided at the lower end of the connecting rod to resist the lower side of the second rest platform, a threaded section is provided on the connecting rod, a threaded sleeve threadedly matched with the threaded section is provided on the threaded section, and a spring support is provided between the threaded sleeve and the first rest platform.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: one side of the connecting rod has a vertical positioning surface, the outer side of the threaded sleeve has gear teeth evenly distributed around the circumference, a detachable mounting plate is arranged on the lower side of the pressure plate, one side of the mounting plate is abutted against the positioning surface to limit the rotation of the connecting rod, and a mounting frame is vertically arranged on the mounting plate, a rotatable gear shaft is arranged on the mounting frame, the gear shaft is meshed with the gear teeth of the threaded sleeve, and a rotating motor is arranged on the mounting frame to be transmission-connected with the gear shaft.

[0016] The beneficial effects of the present invention are:

[0017] The flexible system for sharing multiple crucibles for low-pressure investment casting solves the limitations of existing equipment and realizes the sharing of large quantities, large pieces (single piece can reach one ton), and multiple varieties. It can call the appropriate crucible in real time, can be used for molds of different specifications and models, and ensure the stable pressure of the mold during the casting process, reducing the production of defective products.

[0018] Specifically, according to the production batch arrangement, product size and batch quantity, after determining the required crucible specifications, the crucible is used to melt aluminum, and then the positioning unit moves the crucible to the bottom of the substrate, and the lifting device is used to lift the crucible under the substrate to the upper end of the crucible's riser tube and insert it into the avoidance hole, and make the upper end of the avoidance hole flush with the upper side of the substrate, and manually place the mold (investment shell or resin sand) on the operating table, so that the gate of the mold is facing and sleeved on the upper end of the riser tube, and at this time, the pressing plate is controlled to move down to press the mold. The operation is still very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a multi-crucible shared flexible system for investment low-pressure casting of the present invention;

[0020] Figure 2 A front view of the crucible and the substrate of the present invention;

[0021] Figure 3 A schematic diagram of the matching structure of the crucible and the substrate of the present invention;

[0022] Figure 4 It is a partial structural schematic diagram of the positioning unit of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the positioning unit of the present invention;

[0024] Figure 6 A schematic diagram of a crucible of the present invention;

[0025] Figure 7 It is a schematic diagram of the positioning column arrangement of the present invention;

[0026] Figure 8 It is a schematic diagram of assembling the positioning plate of the present invention;

[0027] Fig. 9 It is a structural schematic diagram of the fixed mold unit of the present invention;

[0028] Fig.10 It is a schematic diagram of the structure of the top rod arrangement of the present invention;

[0029] Fig.11 It is a schematic diagram of the top rod structure of the present invention.

[0030] In the figure: crucible-1, operating table-2, base plate-3, avoidance hole-4, lifting device-5, liquid riser-6, pressure plate-7, horizontal foundation-8, track-9, vehicle body-10, first hydraulic cylinder-11, lifting platform-12, support arm-13, moving unit-14, frame-15, placement table-16, support shaft-17, support wheel-18, connecting arm-19, drive motor-20, positioning column-21, second hydraulic cylinder-22, adjustment table-23, bottom beam-24, guide column-25, travel switch-26, first detection plate-27, second detection plate-28, light hole-29, first sensor-30, second sensor- 31. Guide pillar 32. Mounting plate 33. Connecting plate 34. Connecting pillar 35. Push plate 36. Third hydraulic cylinder 37. Fourth hydraulic cylinder 38. Guide hole 39. Push rod 40. Positioning plate 41. Mounting reference hole 42. First positioning hole 43. Second positioning hole 44. First positioning pin 45. Second positioning pin 46. Threaded hole 47. Connecting rod 48. Press sleeve 49. First support platform 50. Second support platform 51. Stop block 52. Threaded section 53. Threaded sleeve 54. Spring 55. Positioning surface 56. Gear tooth 57. Mounting frame 58. Gear shaft 59. Rotating motor 60. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-11 A multi-crucible shared flexible system for investment low-pressure casting, comprising a plurality of crucibles 1, and an operating table 2; the operating table 2 is provided with a base plate 3 for mounting a casting mold, the base plate 3 has avoidance holes 4, and the crucibles 1 are all arranged below the operating table 2; it also includes a positioning unit, the positioning unit is used to move a single crucible 1 to be directly below the base plate 3, and a lifting device 5 is provided in the positioning unit to lift the crucible 1 directly below the base plate 3 until the upper end of the liquid riser 6 of the crucible 1 is inserted into the avoidance hole 4, and the upper end of the avoidance hole 4 is flush with the upper side of the base plate 3; it also includes a fixed mold unit, the fixed mold unit includes a pressing plate 7 for setting the casting mold, the pressing plate 7 is located directly above the base plate 3, and a lifting device is provided to control the lifting of the pressing plate 7.

[0033] When in use, according to the production batch arrangement, product size and batch quantity, after determining the required crucible specifications, the crucible is used to melt aluminum, and then the positioning unit moves the crucible to the bottom of the substrate, and the lifting device is used to lift the crucible under the substrate 3 to the upper end of the crucible's riser tube and insert it into the avoidance hole, and make the upper end of the avoidance hole 4 flush with the upper side of the substrate, and manually place the mold (investment shell or resin sand) on the operating table, so that the gate of the mold is facing and sleeved on the upper end of the riser tube, and at this time, the pressing plate is controlled to move down to press the mold. The operation is still very convenient.

[0034] Wherein, a horizontal foundation 8 is set, pillars are set on the foundation to support the operating table 2, and the base plate 3 is set in the middle position of the operating table 2.

[0035] Furthermore, the positioning unit includes a horizontally arranged track 9, which is located under the operating platform 2 and extends to both sides of the operating platform 2. A vehicle body 10 that can slide along the track 9 is arranged on the track 9, and a driving device is arranged on the vehicle body 10 to control the movement of the vehicle body 10. The crucible 1 is arranged on the vehicle body 10 along the length direction of the track 9. The lifting device 5 includes a first hydraulic cylinder 11 vertically arranged on both sides of the track 9 below the operating platform 2, and a lifting platform 12 is fixedly arranged on the movable end of the first hydraulic cylinder 11, and rigidly connected support arms 13 are arranged on both sides of the crucible 1. When the vehicle body 10 drives the crucible 1 to reach the position of the lifting device 5 during movement, the support arm 13 is located directly above the lifting platform 12. At the same time, the vehicle body 10 includes a plurality of equally spaced mobile units 14, the mobile unit 14 includes a frame 15, the frame 15 has a placement table 16, and a rotatable support shaft 17 is arranged on the frame 15, and a rigidly connected support wheel 18 is arranged on the support shaft 17 to support the track 9, the crucible 1 is placed on the placement table 16 and the crucible 1 is arranged equally spaced with the center distance of the riser 6 as a spacing, and the arrangement spacing of the crucible 1 is consistent with the arrangement spacing of the mobile unit 14, and adjacent mobile units 14 of the vehicle body 10 are connected by a connecting arm 19, the driving device includes a driving motor 20, and the driving motor 20 is at least arranged on one of the frames 15 and is transmission-connected to the support shaft 17, a lifting and lowering positioning column 21 is arranged directly below the operating table 2, and a second hydraulic cylinder 22 is arranged to control the lifting and lowering of the positioning column 21, and the positioning column 21 is at least one on each side of the length direction of the track 9, and the second hydraulic cylinder 22 controls the lifting of the positioning column 21 to intercept the frame 15 at the upper end of the positioning column 21 to limit the movement of the vehicle body 10. This facilitates the positioning unit to determine the position of the crucible and control its movement.

[0036] Furthermore, since the specifications of different crucibles are inconsistent, an adjustment platform 23 is supported and arranged between different crucibles 1 and the placement platform 16 to make the upper ports of the liquid riser tubes 6 of different crucibles 1 at the same horizontal height. The lifting device 5 also includes a bottom beam 24, and the lifting platform 12 is located directly above the bottom beam 24. The first hydraulic cylinder 11 is supported between the bottom beam 24 and the lifting platform 12, and retractable guide columns 25 are vertically arranged at both ends of the bottom beam 24 to connect the lifting platform 12. Through the adjustment control of the adjustment platform 23, the upper ports of the liquid riser tubes of all crucibles are made to be consistent in height and arranged in the same horizontal straight line. So that the crucible can be lifted by the lifting platform. In this way, there is no need to make a special design for the lifting stroke of the lifting platform, which reduces the design cost, manufacturing cost and production cost.

[0037] Furthermore, in order to accurately locate the position of the crucible when in use, at least one travel switch 26 is respectively arranged on both sides of the length direction of the track 9, and the travel switch 26 is arranged on the upper end of the positioning column 21, and the trigger device of the travel switch 26 is directed to the direction of the positioning column 21 on the opposite side. A first detection plate 27 and a second detection plate 28 are respectively arranged on the crucible 1, and a light hole 29 is provided in the middle of the second detection plate 28. The first detection plate 27 and the second detection plate 28 are arranged in a straight line in the vertical direction. The two first detection plates 27 are respectively arranged on the upper and lower sides of the second detection plate 28 at equal intervals, and the distances from all the first detection plates 27 and the second detection plates 28 to the central axis of the liquid riser 6 are the same. Two vertically arranged first sensors 30 are arranged on one side of the track 9, and two vertically arranged second sensors 31 are arranged on the other side, and the first sensors 30 and the second sensors 31 are opposite to each other. When the crucible 1 is located directly below the substrate 3, the second detection plate 28 and the first detection plate 27 on the upper side are located between the first sensor 30, the second sensor 31 and the second detection plate 28. At this time, the first sensor 30 and the second sensor 31 are mutually coordinated photoelectric switches. When the first sensor 30 and the second sensor 31 are affected by the first detection plate 27 and the second detection plate 28 so that the upper side of the signal is blocked by the first detection plate 27 one by one, and the other side is not blocked, it can be determined that the crucible is directly below the substrate, indicating that the lifting device can be operated at this time.

[0038] Furthermore, in order to accurately control the pressure applied to the mold to avoid damage to the mold and facilitate the installation of the mold, the lifting device includes a guide pillar 32 vertically fixed on the operating table 2, the pressure plate 7 can be slidably arranged on the guide pillar 32 along the guide pillar 32, the top of the guide pillar 32 supports a mounting plate 33, a connecting plate 34 is arranged between the mounting plate 33 and the pressure plate 7, the connecting plate 34 is rigidly connected to the pressure plate 7 through a vertical connecting column 35, a push plate 36 that can slide along the connecting column 35 is arranged between the connecting plate 34 and the pressure plate 7, a third hydraulic cylinder 37 is arranged on the mounting plate 33 to connect the connecting plate 34 to control the up and down movement of the connecting plate 34, a fourth hydraulic cylinder 38 is arranged on the connecting plate 34 to connect the push plate 36 to control the up and down movement of the push plate 36 relative to the connecting plate 34, a plurality of guide holes 39 are arranged on the pressure plate 7, and a plurality of vertical push rods 40 are arranged to pass through the guide holes 39 and are detachably connected to the push plate 36. A detachable positioning plate 41 is provided on the substrate 3, and a mounting reference hole 42 is provided in the middle of the positioning plate 41 opposite to the avoidance hole 4. Two first positioning holes 43 are provided on the substrate 3, and two second positioning holes 44 are provided on the positioning plate 41. The first positioning hole 43 coincides with the second positioning hole 44, and a first positioning pin 45 and a second positioning pin 46 are respectively provided and inserted from the second positioning hole 44 into the first positioning hole 43 to position the positioning plate 41 and connect it to the substrate 3. The push plate 36 has a plurality of threaded holes 47 that are opposite to the guide holes 39 one by one. The push rod 40 includes a connecting rod 48. The connecting rod 48 passes through the guide holes 39 and is detachably connected to the threaded holes 47 by screwing. The lower end of the connecting rod 48 is slidably strung with a pressing sleeve 49 along the length direction. The outer side of the pressing sleeve 49 is provided with a first support platform 50, and the inner side is provided with a second support platform 51. The lower end of the connecting rod 48 passes through the lower side of the second support platform 51 and a stopper 52 rigidly connected to the connecting rod 48 is provided at the lower end of the connecting rod 48 to resist the lower side of the second support platform 51. The connecting rod 48 is provided with a threaded section 53, and a threaded sleeve 54 threadedly matched with the threaded section 53 is provided on the threaded section 53, and a spring 55 is provided between the threaded sleeve 54 and the first support platform 50 for support. For example, in production, such as Figure 4The product is cast using the investment shell at the top of the schematic diagram shown in the figure. The positioning plate 41 with the mounting reference hole 42 suitable for the size of the neck of the investment shell can be designed in advance. After the positioning plate 41 is set on the base plate, it can be ensured that as long as the mold is placed on the positioning plate and the top of the mold is inserted into the mounting reference hole 42, the gate of the mold can be well docked with the upper port of the riser tube, and then the air pressure is introduced into the crucible to start pressure casting, which can improve the efficiency of changing molds, installing molds, and taking and placing products during the production process, and fully ensure the casting quality of the product. At the same time, since the strength of molds such as investment shells and resin sand is not too high, the mold itself cannot be subjected to large external pressure during the casting process, so when the lifting device controls the pressure on the mold, it is best to be effectively controlled to prevent the mold from cracking or deflecting.

[0039] The pressure control method is to apply pressure to the mold through a spring, cover the mold with an asbestos layer when applying pressure, then place a steel plate on the asbestos layer, and use a pressing sleeve 49 to press the steel plate to compress and stabilize the mold. The force applied to the mold is controlled by the spring, and the control method is to adjust the position of the threaded sleeve to control the compression amount of the spring when applying pressure when the stroke of the third hydraulic cylinder and the fourth hydraulic cylinder is known, thereby changing the pressure, so that the pressure is well controlled. As for the stable pressure required for mold casting or the limit pressure that causes mold damage, it can be obtained through conventional limited number tests.

[0040] Furthermore, in order to facilitate the adjustment of the pressure of the press sleeve, a vertical positioning surface 56 is provided on one side of the connecting rod 48, and a gear tooth 57 evenly distributed on the outer side of the threaded sleeve 54 is provided. A detachable mounting plate 33 is provided on the lower side of the pressing plate 7, and one side of the mounting plate 33 is abutted against the positioning surface 56 to limit the rotation of the connecting rod 48. A mounting frame 58 is vertically provided on the mounting plate 33, and a rotatable gear shaft 59 is provided on the mounting frame 58. The gear shaft 59 is in driving engagement with the gear tooth 57 of the threaded sleeve 54, and a rotating motor 60 is provided on the mounting frame 58 to be in driving connection with the gear shaft 59. In this way, the rotating motor 60 can be controlled by the operating system, so that the position parameters of the threaded sleeve 54 can be automatically adjusted according to the setting, thereby adjusting the pressure.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flexible system for sharing multiple crucibles for investment low-pressure casting, comprising a plurality of crucibles (1) and an operating table (2), characterized in that: The operating table (2) is provided with a base plate (3) for mounting a casting mold, the base plate (3) is provided with an avoidance hole (4), and the crucibles (1) are all arranged below the operating table (2); It also comprises a positioning unit, the positioning unit being used to move a single crucible (1) to be directly below the substrate (3), and a lifting device (5) being provided in the positioning unit for lifting the crucible (1) directly below the substrate (3) until the upper end of the lifting tube (6) of the crucible (1) is inserted into the avoidance hole (4), and the upper end of the avoidance hole (4) is flush with the upper side of the substrate (3); It also includes a fixed mold unit, the fixed mold unit including a pressing plate (7) for setting the casting mold, the pressing plate (7) is located directly above the base plate (3), and is provided with a lifting device to control the lifting of the pressing plate (7); The positioning unit comprises a horizontally arranged track (9), the track (9) being located below the operating platform (2) and extending to both sides of the operating platform (2), a vehicle body (10) being arranged on the track (9) and being capable of sliding along the track (9), and a driving device being arranged on the vehicle body (10) to control the movement of the vehicle body (10), the crucible (1) being arranged on the vehicle body (10) along the length direction of the track (9), the lifting device (5) comprising a first hydraulic cylinder (11) being vertically arranged on both sides of the track (9) below the operating platform (2), a lifting platform (12) being fixedly arranged on the movable end of the first hydraulic cylinder (11), and rigidly connected support arms (13) being arranged on both sides of the crucible (1), and when the vehicle body (10) drives the crucible (1) to reach the position of the lifting device (5) during the movement, the support arms (13) are located directly above the lifting platform (12); The vehicle body (10) comprises a plurality of equally spaced mobile units (14), wherein the mobile units (14) comprise a frame (15), wherein the frame (15) has a placement table (16), and a rotatable support shaft (17) is arranged on the frame (15), and a rigidly connected support wheel (18) is arranged on the support shaft (17) and supported on a track (9), wherein a crucible (1) is placed on the placement table (16) and the crucibles (1) are arranged at equal distances with the center distance of the liquid riser (6) as the spacing, and the arrangement spacing of the crucibles (1) is consistent with the arrangement spacing of the mobile units (14), and the spacing between adjacent mobile units (14) of the vehicle body (10) is equal to the spacing between adjacent mobile units (14). The two frames (15) are connected by a connecting arm (19), the driving device comprising a driving motor (20), the driving motor (20) being arranged on at least one of the frames (15) and being transmission-connected to the supporting shaft (17), a positioning column (21) capable of being raised and lowered being arranged directly below the operating platform (2), and a second hydraulic cylinder (22) being arranged to control the raising and lowering of the positioning column (21), at least one positioning column (21) being arranged on each side in the length direction of the track (9), the second hydraulic cylinder (22) controlling the raising of the positioning column (21) to intercept the frame (15) through the upper end of the positioning column (21) and thereby restrict the movement of the vehicle body (10); The lifting device comprises a guide pillar (32) vertically fixedly arranged on the operating table (2); the pressing plate (7) is slidably arranged on the guide pillar (32) up and down along the guide pillar (32); a mounting plate (33) is supported on the top of the guide pillar (32); a connecting plate (34) is arranged between the mounting plate (33) and the pressing plate (7); the connecting plate (34) is rigidly connected to the pressing plate (7) via a vertical connecting pillar (35); a connecting plate (34) is arranged between the connecting plate (34) and the pressing plate (7) A push plate (36) is provided on the column (35) to slide, a third hydraulic cylinder (37) is provided on the mounting plate (33) to connect the connecting plate (34) to control the upward and downward movement of the connecting plate (34), a fourth hydraulic cylinder (38) is provided on the connecting plate (34) to connect the push plate (36) to control the upward and downward movement of the push plate (36) relative to the connecting plate (34), and a plurality of guide holes (39) are provided on the pressure plate (7), and a plurality of vertical push rods (40) are provided to pass through the guide holes (39) and are detachably connected to the push plate (36).

2. The flexible system for multiple crucibles for investment low-pressure casting according to claim 1, characterized in that: The operating table (2) is supported by pillars arranged on a horizontal foundation (8), and the base plate (3) is arranged in the middle of the operating table (2).

3. The flexible system for multiple crucibles for investment low-pressure casting according to claim 1, characterized in that: An adjustment platform (23) is supported and arranged between different crucibles (1) and the placement platform (16) so that the upper ports of the lifting tubes (6) of the different crucibles (1) are at the same horizontal height. The lifting device (5) also includes a bottom beam (24). The lifting platform (12) is located directly above the bottom beam (24). The first hydraulic cylinder (11) is supported between the bottom beam (24) and the lifting platform (12). Retractable guide columns (25) are vertically arranged at both ends of the bottom beam (24) to connect the lifting platform (12).

4. The flexible system for multiple crucibles for investment low pressure casting according to claim 1, characterized in that: At least one travel switch (26) is provided on both sides of the track (9) in the length direction, the travel switch (26) is provided at the upper end of the positioning column (21), and the trigger device of the travel switch (26) is directed in the direction of the positioning column (21) on the opposite side, a first detection plate (27) and a second detection plate (28) are provided on the crucible (1), a light hole (29) is provided in the middle of the second detection plate (28), the first detection plate (27) and the second detection plate (28) are arranged in a straight line in the vertical direction, and two first detection plates (27) are provided on the second detection plate at equal intervals. (28) on the upper and lower sides, and the distances from all the first detection plates (27) and the second detection plates (28) to the central axis of the liquid riser (6) are the same, two vertically arranged first sensors (30) are arranged on one side of the track (9), and two vertically arranged second sensors (31) are arranged on the other side, and the first sensors (30) and the second sensors (31) are arranged one by one, and when the crucible (1) is located directly below the substrate (3), the second detection plate (28) and the upper first detection plate (27) are located directly between the first sensor (30) and the second sensor (31) and the second detection plate (28).

5. The flexible system for multiple crucibles for investment low-pressure casting according to claim 1, characterized in that: The base plate (3) is provided with a detachable positioning plate (41), the positioning plate (41) having a mounting reference hole (42) in the middle thereof opposite to the avoidance hole (4), the base plate (3) having two first positioning holes (43), the positioning plate (41) having two second positioning holes (44), the first positioning hole (43) being overlapped with the second positioning hole (44), and a first positioning pin (45) and a second positioning pin (46) being respectively provided and inserted from the second positioning hole (44) into the first positioning hole (43) so as to position the positioning plate (41) and connect it to the base plate (3).

6. The flexible system for multiple crucibles for investment low-pressure casting according to claim 1, characterized in that: The push plate (36) has a plurality of threaded holes (47) which are opposite to the guide holes (39) one by one. The push rod (40) includes a connecting rod (48). The connecting rod (48) passes through the guide holes (39) and is detachably connected to the threaded holes (47) by means of threaded engagement. A pressing sleeve (49) is slidably mounted on the lower end of the connecting rod (48) along the length direction. A first support platform (50) is arranged on the outer side of the pressing sleeve (49), and a second support platform (51) is arranged on the inner side. The lower end of the connecting rod (48) passes through the lower side of the second support platform (51) and a stopper (52) rigidly connected to the connecting rod (48) is arranged at the lower end of the connecting rod (48) to abut against the lower side of the second support platform (51). A threaded section (53) is arranged on the connecting rod (48). A threaded sleeve (54) threadedly engaged with the threaded section (53) is arranged on the threaded section (53), and a spring (55) is arranged between the threaded sleeve (54) and the first support platform (50) for support.

7. The flexible system for multiple crucibles for investment low-pressure casting according to claim 6, characterized in that: One side of the connecting rod (48) has a vertical positioning surface (56), the outer side of the threaded sleeve (54) has gear teeth (57) evenly distributed around the circumference, a detachable mounting plate (33) is arranged on the lower side of the pressure plate (7), one side of the mounting plate (33) is in contact with the positioning surface (56) to limit the rotation of the connecting rod (48), and a mounting frame (58) is vertically arranged on the mounting plate (33), a rotatable gear shaft (59) is arranged on the mounting frame (58), the gear shaft (59) is in transmission meshing with the gear teeth (57) of the threaded sleeve (54), and a rotating motor (60) is arranged on the mounting frame (58) to be transmission-connected with the gear shaft (59).

Images