Sand injection method and sand injection device for large-disc gear sand mold

Abstract

The invention discloses a sand injection method and a sand injection device for a large-disc gear sand mold, and belongs to the technical field of mold manufacturing, the sand injection device comprises a suspension structure and a mold box, a mold is embedded in the mold box, the mold is provided with a molding cavity and can cover a cover plate, and the suspension structure comprises a rack, a support slidably arranged on the rack, and a sand spitting assembly and a dual-function assembly which are arranged on the support. The vibrating piece is fixed to the outer surface of the mold box, the cover plate abuts against the mold during vibration, the sand spitting assembly is used for injecting crude sand into the molding cavity till the molding cavity is filled with the crude sand, the dual-function assembly transfers the crude sand close to the surface of the mold during vibration and injects the crude sand into the molding cavity from bottom to top, and when the dual-function assembly injects the sand, the mold and the support rotate relative to each other; the cover plate is provided with an opening for allowing the dual-function assembly to penetrate into the molding cavity. According to the sand injection method and the sand injection device for the large-disc gear sand mold, the surface quality of the peripheral surfaces such as a tooth surface and the like of a casting part produced through sand injection of the sand injection device is obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of mold manufacturing, in particular to a sand injection method and a sand injection device for a large disk gear sand mold. Background Art

[0002] The large disc gear is a disc-shaped component assembled on a circular knitting machine. Its structural characteristics make it suitable for production using sand casting technology. Therefore, the quality of the large disc gear casting is directly affected by the quality of the interface between the sand mold and the molten iron.

[0003] When using sand molds to perform split-mold casting on large disc gears, existing sand molds usually use sand injection equipment to continuously inject raw sand mixed with a binder into a mold that matches the surface shape of one side of the large disc gear for compaction, and use adhesives to tightly bond the raw sands together. Among them, the two molds usually have a parting surface along the hub surface on one side of the large disc gear, which can reduce the joining line between the upper sand mold and the lower sand mold as much as possible. At the same time, a number of vibration plates arranged on the outer surface of the mold continuously apply vibration to the mold during the molding of the sand mold, which causes fine raw sand particles to gradually move to the contact surface of the sand mold and the mold, thereby improving the quality of the corresponding surface of the sand mold, and then improving the quality of the surface of the casting.

[0004] However, when this principle was actually applied to the sand mold production of large-disc gears, it was found that due to the high quality requirements of the tooth surface of gear castings such as large-disc gears, under the existing production method, the tooth surface is easily affected by the parting line and the movement of fine raw sand under the action of vibration, resulting in a more complex surface quality condition on the tooth surface of the casting. Specifically, the tooth surface is prone to defects such as cracks, pores and sand holes, which seriously affect the quality of the product.

[0005] In view of the above problems, a sand injection method and a sand injection device are proposed to assist in the production of large disc gear sand molds. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to propose a sand injection method and a sand injection device for a large disc gear sand mold.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a sand injection device for a large disk gear sand mold, comprising a suspension structure and a mold box, a mold is embedded in the mold box, a molding cavity is provided in the mold, and a cover plate can be covered on the mold, and a plurality of vibration sheets are fixedly arranged on the outer surface of the mold box, and the suspension structure comprises: The rack is placed on the ground; A bracket is slidably arranged on the frame, and when the vibration sheet vibrates the mold box, the cover plate abuts against the surface of the mold; A sand-spitting assembly is arranged on the bracket, and is used to inject raw sand into the molding cavity until the raw sand fills the molding cavity; A dual-function component is arranged on the bracket, and the dual-function component transfers the raw sand close to the mold surface during vibration to the inner wall of the mold, and injects the raw sand into the mold cavity from bottom to top along the inner wall of the mold; Among them, when the dual-function component injects raw sand into the molding cavity, the mold and the bracket rotate relatively, and the cover plate is provided with an opening to accommodate the dual-function component to penetrate into the molding cavity. The dual-function component includes a temporary storage box and a plurality of two-way nozzles. The temporary storage box is fixedly arranged on the bracket, and the two-way nozzle is connected to the temporary storage box. The raw sand in the temporary storage box is exchanged with the outside world through the two-way nozzle.

[0008] The present invention is further configured as follows: the bidirectional nozzle includes a guide sleeve and an extension tube sleeved in the guide sleeve, the extension tube is slidably connected to the guide sleeve, and a pneumatic slide is fixedly provided on the bracket for adjusting the length of the extension tube that slides out of the guide sleeve away from the bracket. When the guide sleeve is in the opening, the extension tube can slide along the inner wall of the molding cavity and bend and deform when it abuts against the bottom of the molding cavity, so that the extension tube can continue to extend toward a position close to one side of the sand-spitting assembly.

[0009] The present invention is further configured as follows: the bracket is evenly provided with a plurality of outer slideways, a plurality of the guide sleeves can approach each other by sliding along the outer slideways, and the guide sleeves are detachably connected to the bracket by a bolt.

[0010] The present invention is further configured as follows: the pneumatic slide includes a connecting piece, a pneumatic base and a slider; the connecting piece is detachably connected to the slider by a second bolt; the slider is formed with a through groove for accommodating the second bolt to slide along it; the opening direction of the through groove is the same as that of the outer slide; the pneumatic base is connected to the extension tube by a connecting piece; and the pneumatic base can drive the slider to slide along the axial direction of the guide sleeve.

[0011] The present invention is further configured as follows: the temporary storage box comprises a cyclone separator for accommodating raw sand and a plurality of injection nozzles extending into the cyclone separator, and a humidity sensor is fixedly arranged in the cyclone separator.

[0012] The present invention is further configured as follows: the sand spitting assembly includes a sand storage box and a plurality of sand spitting nozzles detachably connected to the bracket by bolts three, the sand storage box is fixedly arranged on the bracket, and the sand spitting nozzles can be injected with high-pressure gas to guide the raw sand in the sand storage box to flow out along the sand spitting nozzles.

[0013] The present invention is further configured as follows: the bracket is evenly provided with a plurality of inner slideways, and the sand-spitting nozzle can slide along the inner slideways away from the position of the adjacent dual-function component.

[0014] The present invention is further configured as follows: it also includes a base arranged on the ground, a rotating member is fixedly arranged on the base, an output end of the rotating member is fixedly connected to the mold box, and an extrusion cylinder for pushing the bracket to slide close to the base is fixedly arranged on the frame.

[0015] A method for injecting sand into a large disc gear sand mold, using the above-mentioned large disc gear sand mold injecting device for production, comprises the following steps: S1: Sand injection: install the mold in the mold box, and then inject 100% of the rated mass of raw sand into the mold cavity through the sand ejection component; S2: Sand spreading: vibrate the raw sand through the vibration plate, so that the raw sand can cover the molding cavity as much as possible, then stop the vibration of the vibration plate, and then cover the mold with a cover plate; S3: absorb small particles of raw sand, pass the dual-function component through the opening on the cover plate, and then start the vibration plate again. The dual-function component gradually absorbs small particles of raw sand close to the mold surface from the extreme position away from the opening toward the opening until the position where the dual-function component absorbs small particles of raw sand is at the inner wall of the mold; S4: injecting small particles of raw sand, so that the dual-function component re-injects the absorbed small particles of raw sand into the molding cavity, and at the same time, the mold and the bracket rotate relative to each other, and the dual-function component gradually moves upward and away from the bottom of the mold, and then the mold and the bracket stop rotating relative to each other; S5: unloading, taking the mold out of the mold box; Among them, the extreme position in S3 is close to the position where the sand-spitting component injects raw sand into the molding cavity, the mass of small-particle raw sand sucked by the dual-function component in S3 does not exceed 5% of the rated mass of the raw sand, and the projections of several paths of the dual-function component in S4 that inject small-particle raw sand into the molding cavity toward the ground are connected end to end.

[0016] In summary, the present invention has the following beneficial effects: the position where small particles of raw sand are re-mixed into the raw sand is concentrated at the outermost side of the large disc gear sand mold, so that the small particles of raw sand at this position are gathered, so that under the vibration of the vibration plate, the large particles of raw sand at this position are replaced by small particles of raw sand, and the large particles of raw sand gradually move away from the tooth surface position of the large disc gear, thereby significantly improving the surface quality of the surrounding surfaces such as the tooth surface of the casting produced by the sand injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is an exploded view of the structure of the mold box, mold and cover plate of the present invention; Figure 3 for Figure 1 The enlarged view of point A in the middle; Figure 4 It is a schematic diagram of the structure of the support of the present invention; Figure 5 for Figure 4 The enlarged view of point B in the middle; Figure 6 It is a cross-sectional view of the base, mold box, mold, cover plate, guide sleeve and extension tube of the present invention; Figure 7 for Figure 6 Enlarged view of point C in the middle; Figure 8 It is a cross-sectional view of the sand storage box of the present invention.

[0018] In the figure: 1. base; 2. mold box; 3. mold; 31. molding cavity; 4. vibrating plate; 5. sand spitting assembly; 51. sand spitting nozzle; 52. sand storage box; 6. dual-function assembly; 61. guide sleeve; 62. extension tube; 63. temporary storage box; 631. cyclone separator; 632. injection nozzle; 633. humidity sensor; 7. cover plate; 71. opening; 8. bracket; 81. inner slide; 82. outer slide; 9. extrusion cylinder; 10. pneumatic slide; 11. frame; 12. rotating part. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments.

[0020] A sand injection device for a large disc gear sand mold, such as Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, it includes a suspension structure and a base 1, the suspension structure includes a frame 11 placed on the ground, the base 1 realizes relative sliding with the frame 11 through four sets of rollers at the bottom thereof, the frame 11 drives the base 1 through a first motor arranged at the bottom thereof and a screw rod coaxially fixed with the output end of the first motor, so that the base 1 can stably run on the ground with the frame 11 spaced apart, a mold box 2 for accommodating a mold 3 by being engaged is supported on the base 1 through a plurality of support blocks, a molding cavity 31 is provided in the mold 3, and a plurality of vibration sheets 4 are fixedly arranged on the outer surface of the mold box 2 to produce attached Figure 2Taking the large disk gear sand mold with the middle mold cavity 31 as an example, the mold 3 is used to make the lower mold of the sand mold, and the peripheral side of the mold 3 fits the inner wall of the mold box 2; When the device is in use, the mold 3 is placed in the mold box 2. Above the mold box 2, a frame 11 is slidably provided with a bracket 8, and an extrusion cylinder 9 is fixed to push the bracket 8 close to the base 1. During the pushing process, the height position of the mold 3 remains unchanged until the lower surface of the bracket 8 abuts against the cover plate 7 covering the mold 3, and the extrusion cylinder 9 stops moving. Before the extrusion cylinder 9 abuts against the cover plate 7, the mold cavity 31 is injected with raw sand through the sand-discharging assembly 5 provided on the frame 11, and the extrusion cylinder 9 operates after the raw sand fills the mold cavity 31. After the cover plate 7 is abutted and the cover plate 7 completely covers the cavity opening of the accommodating cavity, the plurality of vibration plates 4 can start to vibrate the mold box 2, so that the mold 3 fitted with the mold box 2 can vibrate together. At this time, the raw sand continuously vibrates small particles of raw sand to the cavity bottom position close to the molding cavity 31 during the vibration process. At the same time, the dual-function component 6 arranged on the bracket 8 transfers the raw sand close to the surface of the mold 3 during the vibration to the inner wall position of the mold 3 by suction. After absorbing the small particles of raw sand accounting for 5% of the total mass of the raw sand, the dual-function component 6 injects the small particles of raw sand into the raw sand in the molding cavity 31 along the inner wall of the mold 3 from bottom to top. At the same time, the rotating member 12 fixedly arranged on the base 1 is running. In this embodiment, the rotating member 12 is a second motor, which rotates the mold box 2 fixedly connected to the output end of the rotating member 12, so that the mold 3 and the bracket 8 rotate relative to each other. Under the action of the rotating member 12, the small particles of raw sand injected by the dual-function component 6 can completely cover all areas combined with the tooth surface interface of the large disc gear casting, that is, the projections of several paths of the dual-function component 6 injecting small particles of raw sand into the molding cavity 31 toward the ground are connected end to end through the rotating member 12. In order to allow the dual-function component 6 to continuously inject small particles of raw sand into the molding cavity 31 during this process, the cover plate 7 is provided with an opening 71 to accommodate the dual-function component 6 to penetrate into the molding cavity 31. After all the small particles of raw sand are re-injected into the molding cavity 31, the rotating member 12 stops running and the several vibration plates 4 stop vibrating.

[0021] Effect of the invention: The position where the small particles of raw sand are re-mixed into the raw sand is concentrated at the outermost side of the large disc gear sand mold, so that the small particles of raw sand at this position are gathered, so that under the vibration of the vibration plate 4, the large particles of raw sand at this position are replaced by small particles of raw sand, and the large particles of raw sand gradually move away from the tooth surface position of the large disc gear, so that the surface quality of the tooth surface and other surrounding surfaces of the casting produced by the sand injection device is significantly improved, and part of the small particles of raw sand also sink to the bottom for the second time due to the vibration at this position, so that the sand mold parting surface where this part of the small particles of raw sand is located is less likely to fall off when the mold is closed, which also affects the surface quality of the tooth surface.

[0022] like Figure 4 , Figure 5 , Figure 6 as well as Figure 7 As shown, specifically, the dual-function component 6 includes a temporary storage box 63 and a plurality of bidirectional nozzles. The temporary storage box 63 is fixedly arranged on the bracket 8, and the bidirectional nozzles are connected to the temporary storage box 63. The raw sand in the temporary storage box 63 is exchanged with the outside through the bidirectional nozzles, wherein the bidirectional nozzle includes a guide sleeve 61 and an extension tube 62 sleeved in the guide sleeve 61, and the extension tube 62 is slidably connected to the guide sleeve 61. A pneumatic slide 10 for adjusting the length of the end of the extension tube 62 that is away from the bracket 8 and slides out of the guide sleeve 61 is fixedly arranged on the bracket 8. The pneumatic slide 10 includes a connecting piece, a pneumatic base and a slider. The connecting piece is detachably connected to the slider through a second bolt. The slider is formed with a through groove for accommodating the second bolt to slide along it. The opening direction of the through groove is the same as that of the outer slide 82. The pneumatic base is connected to the extension tube 62 through a connecting piece, and the pneumatic base can drive the slider to slide along the axial direction of the guide sleeve 61. Since the cover plate 7 is provided with an opening 71, in order to prevent the extension tube 62 from bringing out the raw sand when it moves, the outer diameter of the guide sleeve 61 fits the inner diameter of the opening 71, and when the extension tube 62 needs to slide, the guide sleeve 61 is in the opening 71. At this time, the extension tube 62 can slide along the inner wall of the molding cavity 31, and bend and deform when it abuts against the cavity bottom of the molding cavity 31. In order to allow the extension tube 62 to continue to extend toward the position close to the sand-spitting component 5, firstly, the axis of the extension tube 62 can be in a unidirectional bending state when it is outside the guide sleeve 61, and secondly, a notch can be provided on the sleeve, so that the extension tube 62 tends to extend toward the side of the notch, that is, toward the side close to the sand-spitting component 5 after abutting the surface of the mold 3. The extension tube 62 that is not guided by these two points can also be ejected toward the side close to the sand-spitting component 5 after continuous extension due to its large elastic deformation, and the raw sand in the molding cavity 31 will not splash out due to the protection of the cover plate 7. Taking into account the different outer diameter positions of the tooth surfaces of different large-plate gears, a plurality of outer slideways 82 are evenly provided on the bracket 8, and a plurality of guide sleeves 61 can be close to each other by sliding along the outer slideway 82. The guide sleeve 61 is detachably connected to the bracket 8 by a bolt. Meanwhile, taking into account the total mass of the small-particle raw sand to be as loss-free as possible between being absorbed and injected, the temporary storage box 63 includes a cyclone separator 631 for accommodating the raw sand. The cyclone separator 631 specifically includes a shell with a constricted structure and a spiral fan blade fixedly arranged in the shell. A fan is arranged at one end of the shell with a smaller inner diameter, and a fan is arranged at one end of the shell with a larger inner diameter. The end is used for temporarily storing small particles of raw sand, which are brought into the shell along the extension tube 62 under the blowing of the fan. Due to the obstruction of the spiral fan blades, all small particles of raw sand except dust will stay at the end with a larger inner diameter of the shell, waiting to be blown into the extension tube 62 by the fan again. Considering that part of the adhesive will be carried out by the airflow, a number of injection nozzles 632 for blasting adhesive onto the surface of the small particles of raw sand are extended into the cyclone separator 631. At the same time, in order to facilitate the regulation of the amount of adhesive blasted by the injection nozzle 632, a humidity sensor 633 is fixedly installed in the cyclone separator 631.

[0023] like Figure 4 , Figure 5 as well as Figure 8 As shown, the sand-spitting assembly 5 includes a sand storage box 52 and a plurality of sand-spitting nozzles 51 detachably connected to the bracket 8 by bolts 3. The sand storage box 52 is fixedly arranged on the bracket 8. The sand-spitting nozzles 51 can be injected with high-pressure gas to guide the raw sand in the sand storage box 52 to flow out along the sand-spitting nozzles 51. In this embodiment, the eight sand-spitting nozzles 51 are all connected to the sand storage box 52 through a pipeline. When the raw sand in the sand storage box 52 is reduced, it is input from the outside into the sand storage box 52. Similarly, considering the changes in the diameters of different large-plate gears, in order to enable the plurality of sand-spitting nozzles 51 to be as close to the center of the radius of the large-plate gear as possible when injecting raw sand into the molding cavity 31, the bracket 8 is evenly provided with a plurality of inner slideways 81, and the sand-spitting nozzles 51 can slide along the inner slideways 81 away from the position of the dual-function component 6 close to it.

[0024] A method for injecting sand into a large disc gear sand mold, using the above-mentioned large disc gear sand mold injecting device for production, comprises the following steps: S1: sand injection, the mold 3 is installed in the mold box 2, and then 100% of the rated mass of raw sand is injected into the mold cavity 31 through the sand ejection assembly 5; S2: Sand spreading, vibrating the raw sand through the vibration plate 4, so that the raw sand covers the molding cavity 31 as much as possible, then stopping the vibration of the vibration plate 4, and then covering the mold 3 with a cover plate 7; S3: Adsorbing small particles of raw sand, passing the dual-function component 6 through the opening 71 on the cover plate 7, and then starting the vibrating plate 4 again, the dual-function component 6 gradually absorbs small particles of raw sand close to the surface of the mold 3 from the extreme position away from the opening 71 toward the opening 71, until the position where the dual-function component 6 absorbs the small particles of raw sand is located at the inner wall of the mold 3; S4: injecting small particles of raw sand, so that the dual-function component 6 re-injects the absorbed small particles of raw sand into the molding cavity 31, and at the same time, the mold 3 and the bracket 8 rotate relative to each other, and the dual-function component 6 gradually moves upward and away from the bottom of the mold 3, and then the mold 3 and the bracket 8 stop rotating relative to each other; S5: unloading, taking out the mold 3 from the mold box 2; Among them, the extreme position in S3 is close to the position where the sand-spitting component 5 injects raw sand into the molding cavity 31, the mass of small-particle raw sand sucked by the dual-function component 6 in S3 does not exceed 5% of the rated mass of the raw sand, and the projections of several paths of the dual-function component 6 in S4 that inject small-particle raw sand into the molding cavity 31 toward the ground are connected end to end.

[0025] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sand injection device for a large plate gear sand mold, comprising a suspension structure and a mold box (2), wherein a mold (3) is embedded in the mold box (2), a molding cavity (31) is provided in the mold (3), and a cover plate (7) can be covered on the mold (3), and a plurality of vibration plates (4) are fixedly arranged on the outer surface of the mold box (2), characterized in that: The suspension structure includes: A frame (11) is placed on the ground; A bracket (8) is slidably arranged on the frame (11), and when the vibration plate (4) vibrates the mold box (2), the cover plate (7) abuts against the surface of the mold (3); A sand-spitting assembly (5) is arranged on the bracket (8), and the sand-spitting assembly (5) is used to inject raw sand into the molding cavity (31) until the raw sand fills the molding cavity (31); A dual-function component (6) is arranged on a support (8), wherein the dual-function component (6) transfers the raw sand close to the surface of the mold (3) to the inner wall of the mold (3) during vibration, and injects the raw sand into the raw sand contained in the molding cavity (31) from bottom to top along the inner wall of the mold (3); When the dual-function component (6) injects raw sand into the molding cavity (31), the mold (3) and the bracket (8) rotate relative to each other, and the cover plate (7) is provided with an opening (71) for accommodating the dual-function component (6) to penetrate into the molding cavity (31). The dual-function component (6) comprises a temporary storage box (63) and a plurality of bidirectional nozzles. The temporary storage box (63) is fixedly arranged on the bracket (8), and the bidirectional nozzles are connected to the temporary storage box (63). The raw sand in the temporary storage box (63) is exchanged with the outside through the bidirectional nozzles.

2. The sand injection device for a large disc gear sand mold according to claim 1, characterized in that: The bidirectional nozzle comprises a guide sleeve (61) and an extension tube (62) sleeved in the guide sleeve (61); the extension tube (62) is slidably connected to the guide sleeve (61); a pneumatic slide (10) is fixedly provided on the bracket (8) for adjusting the length of the extension tube (62) sliding out of the guide sleeve (61) at one end away from the bracket (8); when the guide sleeve (61) is in the opening (71), the extension tube (62) can slide along the inner wall of the molding cavity (31) and bend and deform when it abuts against the bottom of the molding cavity (31), so that the extension tube (62) can continue to extend toward a position close to the side of the sand-spitting component (5).

3. The sand injection device for a large disc gear sand mold according to claim 2, characterized in that: The bracket (8) is evenly provided with a plurality of outer slideways (82), and the plurality of guide sleeves (61) can slide close to each other along the outer slideways (82), and the guide sleeves (61) are detachably connected to the bracket (8) by bolts.

4. The sand injection device for a large disc gear sand mold according to claim 3, characterized in that: The pneumatic slide (10) comprises a connecting piece, a pneumatic base and a slider, wherein the connecting piece is detachably connected to the slider via two bolts, the slider is formed with a through groove for accommodating the two bolts to slide along it, and the opening direction of the through groove is the same as that of the outer slideway (82), the pneumatic base is connected to the extension tube (62) via the connecting piece, and the pneumatic base can drive the slider to slide along the axial direction of the guide sleeve (61).

5. The sand injection device for a large disc gear sand mold according to claim 1, characterized in that: The temporary storage box (63) comprises a cyclone separator (631) for accommodating raw sand and a plurality of injection nozzles (632) extending into the cyclone separator (631). A humidity sensor (633) is fixedly arranged in the cyclone separator (631).

6. The sand injection device for a large disk gear sand mold according to claim 1, characterized in that: The sand spitting assembly (5) comprises a sand storage box (52) and a plurality of sand spitting nozzles (51) detachably connected to a bracket (8) via bolts; the sand storage box (52) is fixedly arranged on the bracket (8); the sand spitting nozzles (51) can be injected with high-pressure gas to guide the raw sand in the sand storage box (52) to flow out along the sand spitting nozzles (51).

7. The sand injection device for a large disc gear sand mold according to claim 6, characterized in that: The support (8) is evenly provided with a plurality of inner slideways (81), and the sand-spitting nozzle (51) can slide along the inner slideways (81) away from the position of the adjacent dual-function component (6).

8. The sand injection device for a large disk gear sand mold according to claim 1, characterized in that: It also comprises a base (1) arranged on the ground, a rotating member (12) being fixedly arranged on the base (1), an output end of the rotating member (12) being fixedly connected to the mold box (2), and an extrusion cylinder (9) for pushing the bracket (8) to slide close to the base (1) being fixedly arranged on the frame (11).

9. A sand injection method for a large plate gear sand mold, characterized in that: The production is carried out using the sand injection device for the large disc gear sand mold according to any one of claims 1 to 8, comprising the following steps: S1: sand injection, installing the mold (3) in the mold box (2), and then injecting 100% of the rated mass of raw sand into the mold cavity (31) through the sand ejection component (5); S2: spreading sand, vibrating the raw sand through the vibration plate (4) so ​​that the raw sand fills the molding cavity (31) as much as possible, then stopping the vibration of the vibration plate (4), and then covering the mold (3) with a cover plate (7); S3: Adsorbing small particles of raw sand, passing the dual-function component (6) through the opening (71) on the cover plate (7), and then starting the vibrating plate (4) again, so that the dual-function component (6) gradually absorbs small particles of raw sand close to the surface of the mold (3) from the extreme position away from the opening (71) toward the opening (71), until the position where the dual-function component (6) absorbs the small particles of raw sand is located at the inner side wall of the mold (3); S4: injecting small particles of raw sand, so that the dual-function component (6) re-injects the absorbed small particles of raw sand into the molding cavity (31), and at the same time, the mold (3) and the support (8) rotate relative to each other, and the dual-function component (6) gradually moves upward and away from the bottom of the mold (3), and then the mold (3) and the support (8) stop rotating relative to each other; S5: unloading, taking the mold (3) out of the mold box (2); The extreme position in S3 is close to the position where the sand-discharging component (5) injects raw sand into the molding cavity (31), the mass of the small-particle raw sand sucked by the dual-function component (6) in S3 does not exceed 5% of the rated mass of the raw sand, and the projections of several paths of the dual-function component (6) in S4 that inject small-particle raw sand into the molding cavity (31) toward the ground are connected end to end.

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