A sand injection method and device for a large disc gear sand mold

Abstract

The present invention discloses a sand injection method and a sand injection device for a large-diameter gear sand mold, belonging to the technical field of mold manufacturing. It includes a suspension structure and a mold box. A mold is fitted inside the mold box. The mold is provided with a plastic cavity and can cover a cover plate. The suspension structure includes a frame, a bracket slidably arranged on the frame, and a sand discharging component and a dual-functional component arranged on the bracket. A vibration plate is fixed on the outer surface of the mold box. When vibrating, the cover plate abuts against the mold. The sand discharging component is used to inject green sand into the plastic cavity until it is filled. The dual-functional component transfers the green sand close to the surface of the mold during vibration and injects it into the plastic cavity from bottom to top. When the dual-functional component injects sand, the mold and the bracket rotate relative to each other. The cover plate is provided with an opening to allow the dual-functional component to penetrate into the plastic cavity. For the sand injection method and the sand injection device for a large-diameter gear sand mold of the present invention, the surface quality of the surrounding surfaces such as the tooth surface of the casting produced by injecting sand through this sand injection device is significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mold manufacturing, and particularly to a sand injection method and a sand injection device for a large-diameter gear sand mold. Background Art

[0002] A large-diameter gear is a disc-shaped component assembled on a circular weft knitting machine. Due to its structural characteristics, it is suitable for production by the sand casting process. Therefore, the quality of the large-diameter gear casting is directly affected by the bonding quality of the interface between the sand mold and the molten iron.

[0003] When using a sand mold to perform split mold casting on a large-diameter gear, the existing sand mold is usually formed by continuously injecting the original sand mixed with a binder into a mold that matches the shape of one side surface of the large-diameter gear through a sand injection device and compacting it. The binder is used to tightly bond the original sands together. Among them, the two molds usually use the hub surface on one side of the large-diameter gear as the split mold surface, which can minimize the mold joint line between the upper sand mold and the lower sand mold. At the same time, several vibrating plates arranged on the outer surface of the mold continuously apply vibration to the mold during the formation of the sand mold, prompting the small original sand particles to gradually move to the contact surface between the sand mold and the mold, thereby improving the quality of the corresponding surface of the sand mold and further enhancing the quality of the surface of the casting.

[0004] However, when actually applying this principle to produce the large-diameter gear sand mold, it is found that due to the high quality requirements for the tooth surface of gear castings such as large-diameter gears, and in the existing production method, the tooth surface is easily affected by the split line and the movement of small original sands under the vibration effect, resulting in a relatively 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 and manufacturing of the large-diameter gear sand mold. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems in the prior art, and a sand injection method and a sand injection device for a large-diameter gear sand mold are proposed.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: A sand injection device for a large-diameter gear sand mold, including a suspension structure and a mold box. A mold is fitted inside the mold box, a plastic cavity is formed inside the mold, and a cover plate can be covered on the mold. A number of vibrating plates are fixedly arranged on the outer surface of the mold box. The suspension structure includes:

[0008] A frame placed on the ground;

[0009] A bracket slidably arranged on the frame. When the vibrating plates vibrate the mold box, the cover plate abuts against the surface of the mold.

[0010] The sand discharging assembly is arranged on the bracket. The sand discharging assembly is used to inject original sand into the molding cavity until the molding cavity is filled with the original sand.

[0011] The dual-functional assembly is arranged on the bracket. The dual-functional assembly transfers the original sand close to the mold surface during vibration to the inner side wall of the mold and injects it into the original sand contained in the molding cavity from bottom to top along the inner side wall of the mold.

[0012] Among them, when the dual-functional assembly injects the original sand into the molding cavity, the mold and the bracket rotate relative to each other. The cover plate is provided with an opening for the dual-functional assembly to penetrate into the molding cavity. The dual-functional assembly includes a temporary storage box and a plurality of bidirectional nozzles. The temporary storage box is fixedly arranged on the bracket. The bidirectional nozzles are communicated with the temporary storage box. The original sand in the temporary storage box is exchanged with the outside through the bidirectional nozzles.

[0013] The present invention is further arranged as follows: The bidirectional nozzle includes a guiding sleeve and an extension tube sleeved inside the guiding sleeve. The extension tube is slidably connected with the guiding sleeve. An air-powered slide is fixedly arranged on the bracket for adjusting the length of the end of the extension tube far from the bracket to slide out of the guiding sleeve. When the guiding sleeve is inside the opening, the extension tube can slide along the inner side 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 towards the position close to the sand discharging assembly.

[0014] The present invention is further arranged as follows: The bracket is evenly provided with a plurality of outer slideways. A plurality of the guiding sleeves can approach each other through sliding along the outer slideways. The guiding sleeve is detachably connected with the bracket through bolt one.

[0015] The present invention is further arranged as follows: The air-powered slide includes a connecting piece, an air-powered base and a slider. The connecting piece is detachably connected with the slider through bolt two. The slider is formed with a through groove for accommodating bolt two to slide along it. The opening direction of the through groove is the same as that of the outer slideway. The air-powered base is connected with the extension tube through the connecting piece. The air-powered base can drive the slider to slide along the axis direction of the guiding sleeve.

[0016] The present invention is further arranged as follows: The temporary storage box includes a cyclone separator for accommodating the original sand and a plurality of injection nozzles extending into the cyclone separator. A humidity sensor is fixedly arranged inside the cyclone separator.

[0017] The present invention is further arranged as follows: The sand discharging assembly includes a sand storage box and a plurality of sand discharging nozzles detachably connected with the bracket through bolt three. The sand storage box is fixedly arranged on the bracket. The sand discharging nozzles can inject high-pressure gas to guide the original sand in the sand storage box to flow out along the sand discharging nozzles.

[0018] The present invention is further configured such that: a plurality of inner sliding channels are evenly formed in the bracket, and the sand spraying nozzle can slide along the inner sliding channels away from the position of the adjacent dual-functional component.

[0019] The present invention is further configured such that: it further includes a base disposed on the ground, a rotating member is fixedly arranged on the base, the 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.

[0020] A sand injection method for a large disc gear sand mold, which is produced by using the above-mentioned sand injection device for the large disc gear sand mold, includes the following steps:

[0021] S1: Sand injection. Install the mold in the mold box, and then inject 100% of the rated mass of the original sand into the plastic cavity through the sand spraying component.

[0022] S2: Sand spreading. Vibrate the original sand through the vibrating piece to make the original sand cover the plastic cavity as much as possible, then stop the vibration of the vibrating piece, and then cover the mold with a cover plate.

[0023] S3: Adsorbing small-particle original sand. Pass the dual-functional component through the opening on the cover plate, then start the vibrating piece again, and the dual-functional component gradually absorbs the small-particle original sand close to the surface of the mold from the extreme position far away from the opening towards the opening until the position where the dual-functional component absorbs the small-particle original sand is at the inner side wall position of the mold.

[0024] S4: Injecting small-particle original sand. Make the dual-functional component re-inject the absorbed small-particle original sand into the plastic cavity. At the same time, the mold and the bracket rotate relative to each other, and the dual-functional 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.

[0025] S5: Unloading. Take out the mold from the mold box.

[0026] Wherein, the extreme position in S3 is the position close to the sand spraying component for injecting the original sand into the plastic cavity. The mass of the small-particle original sand sucked by the dual-functional component in S3 does not exceed 5% of the rated mass of the original sand. The projections of the several paths for the dual-functional component to inject the small-particle original sand into the plastic cavity towards the ground are connected end to end.

[0027] In summary, the present invention has the following beneficial effects: The position where the small-particle original sand is re-mixed into the original sand is concentrated on the outermost side of the large disc gear sand mold, causing the small-particle original sand at this position to gather. Thus, under the vibration of the vibrating piece, the large-particle original sand at this position is replaced by the small-particle original sand, and the large-particle original sand gradually moves away from the tooth surface position of the large disc gear. As a result, the surface quality of the surrounding surfaces such as the tooth surface of the casting produced by injecting sand with this sand injection device is significantly improved. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the present invention;

[0029] Figure 2 is an exploded structural view of the mold box, mold and cover plate of the present invention;

[0030] Figure 3 is Figure 1 an enlarged view of part A in

[0031] Figure 4 is a schematic structural diagram of the bracket of the present invention;

[0032] Figure 5 is Figure 4 an enlarged view of part B in

[0033] Figure 6 is a cross-sectional view of the base, mold box, mold, cover plate, guide sleeve and extension pipe of the present invention;

[0034] Figure 7 is Figure 6 an enlarged view of part C in

[0035] Figure 8 is a cross-sectional view of the sand storage box of the present invention.

[0036] In the figure: 1. Base; 2. Mold box; 3. Mold; 31. Plastic cavity; 4. Vibration plate; 5. Sand discharging assembly; 51. Sand discharging nozzle; 52. Sand storage box; 6. Dual-function assembly; 61. Guide sleeve; 62. Extension pipe; 63. Temporary storage box; 631. Cyclone separator; 632. Injection nozzle; 633. Humidity sensor; 7. Cover plate; 71. Opening; 8. Bracket; 81. Inner slideway; 82. Outer slideway; 9. Extrusion cylinder; 10. Pneumatic slide; 11. Frame; 12. Rotating part. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0038] A sand injection device for a large disc gear sand mold, such as Figure 1 , Figure 2 , Figure 3 andFigure 4 As shown in the figure, it includes a suspension structure and a base 1. The suspension structure includes a frame 11 placed on the ground. The base 1 can slide relative to the frame 11 through four groups of rollers at its bottom. The frame 11 drives the base 1 through a first motor arranged at its bottom and a lead screw coaxially fixed to the output end of the first motor, so that the base 1 can stably run on the ground at intervals of the frame 11. A mold box 2 for accommodating a mold 3 by fitting is supported on the base 1 through a number of support blocks. A plastic cavity 31 is formed in the mold 3. A number of vibration plates 4 are fixedly arranged on the outer surface of the mold box 2 for production attachment Figure 2 Taking the large disc gear sand mold with the parting surface as the shape of the plastic cavity 31 in the middle as an example, this mold 3 is used to manufacture the lower mold of the sand mold, and the periphery of the mold 3 fits against the inner wall of the mold box 2;

[0039] When the device is in use, the mold 3 is placed in the mold box 2. Above the mold box 2, a bracket 8 is slidably arranged on the frame 11, 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 on the cover plate 7 covering the mold 3, and then the extrusion cylinder 9 stops moving. Before the extrusion cylinder 9 abuts on the cover plate 7, the plastic cavity 31 is filled with raw sand through a sand discharging component 5 arranged on the frame 11 until the plastic cavity 31 is filled with raw sand, and then the extrusion cylinder 9 operates;

[0040] After the cover plate 7 is abutted and the cover plate 7 completely covers the orifice position of the accommodating cavity, a number of vibration plates 4 can start to vibrate the mold box 2, so that the mold 3 in contact with the mold box 2 vibrates together. At this time, during the vibration, the small-particle raw sand is continuously vibrated to a position close to the bottom of the plastic cavity 31. At the same time, a dual-functional component 6 arranged on the bracket 8 transfers the raw sand close to the surface of the mold 3 during vibration to the inner wall position of the mold 3 by suction;

[0041] After the dual-functional component 6 absorbs small-particle raw sand accounting for 5% of the total mass of the raw sand, it injects these small-particle raw sands into the raw sand in the plastic cavity 31 from bottom to top along the inner wall of the mold 3. At the same time, the rotating member 12 fixedly arranged on the base 1 operates. In this embodiment, the rotating member 12 is the second motor, which makes the mold box 2 fixedly connected to the output end of the rotating member 12 rotate, so that the mold 3 and the bracket 8 rotate relative to each other. Under the action of the rotating member 12, the small-particle raw sands injected by the dual-functional component 6 can completely cover all areas combined with the tooth surface interface of the large-disk gear casting, that is, the projections of several paths for the dual-functional component 6 to inject small-particle raw sands into the plastic cavity 31 towards the ground are connected end to end. In order to make the dual-functional component 6 continuously inject small-particle raw sands into the plastic cavity 31 during this process, the cover plate 7 is provided with an opening 71 for the dual-functional component 6 to penetrate into the plastic cavity 31. Until all the small-particle raw sands are re-injected into the plastic cavity 31, the rotating member 12 stops operating, and several vibration plates 4 stop vibrating.

[0042] Invention effect:

[0043] The position where the small-particle raw sands are re-mixed into the raw sand is concentrated on the outermost side of the large-disk gear sand mold, causing the small-particle raw sands at this position to gather. Thus, under the vibration of the vibration plate 4, the large-particle raw sands at this position are replaced by the small-particle raw sands, and the large-particle raw sands gradually move away from the tooth surface position of the large-disk gear. As a result, for the casting produced by injecting sand through this sand injection device, the surface quality of the surrounding surfaces such as the tooth surface is significantly improved. Moreover, some of the small-particle raw sands also sink to the bottom again at this position due to vibration, making it less likely for the sand mold parting surface where these small-particle raw sands are located to have problems such as sand dropping during mold closing, which also affects the tooth surface quality.

[0044] As Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, specifically, the dual-functional component 6 includes a temporary storage box 63 and several two-way nozzles. The temporary storage box 63 is fixedly arranged on the bracket 8, and the two-way nozzles are communicated with the temporary storage box 63. The raw sand in the temporary storage box 63 is exchanged with the outside through the two-way nozzles. Among them, the two-way nozzle includes a guiding sleeve 61 and an extension tube 62 sleeved inside the guiding sleeve 61. The extension tube 62 is slidably connected to the guiding sleeve 61. A pneumatic slide 10 for adjusting the length of the end of the extension tube 62 far from the bracket 8 sliding out of the guiding sleeve 61 is fixedly arranged on the bracket 8. The pneumatic slide 10 includes a connecting member, a pneumatic base, and a slider. The connecting member is detachably connected to the slider through a second bolt. The slider is formed with a through groove for the second bolt to slide along it. 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 through the connecting member, and the pneumatic base can drive the slider to slide along the axis direction of the guiding sleeve 61;

[0045] Since the cover plate 7 is provided with an opening 71, in order to prevent the original sand from being carried out when the extension tube 62 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 located within the opening 71. At this time, the extension tube 62 can slide along the inner side wall of the plastic cavity 31 and undergoes a bending deformation when it abuts against the bottom of the plastic cavity 31. In order for the extension tube 62 to continue to extend towards the position closer to the sand discharging assembly 5, firstly, the axis of the extension tube 62 can be in a state of being unidirectionally bent when it is outside the guide sleeve 61. Secondly, a notch can be provided on the sleeve, so that the extension tube 62 tends to extend towards the side of the notch, that is, towards the side closer to the sand discharging assembly 5 after abutting against the surface of the mold 3. The extension tube 62 that has not been guided by these two points can also pop out towards the side closer to the sand discharging assembly 5 after continuous extension due to its large elastic deformation, and since it is protected by the cover plate 7, the original sand in the plastic cavity 31 will not splash out;

[0046] Considering that the outer diameter positions of the tooth surfaces of different large disc gears are different, a number of outer sliding grooves 82 are evenly provided on the support 8, and a number of guide sleeves 61 can approach each other by sliding along the outer sliding grooves 82. The guide sleeve 61 is detachably connected to the support 8 by a first bolt. At the same time, considering that the total mass of the small particle original sand is made to be as lossless as possible between being absorbed and being injected, the temporary storage box 63 includes a cyclone separator 631 for accommodating the original sand. The cyclone separator 631 specifically includes a housing with a reduced opening structure and a spiral fan blade fixedly arranged inside the housing. A blower is provided at the end with a smaller inner diameter of the housing, and the end with a larger inner diameter of the housing is used to temporarily store the small particle original sand. The small particle original sand is blown into the housing along the extension tube 62 by the blower. Due to the blocking of the spiral fan blade, all the small particle original sand except for the dust will stay at the end with a larger inner diameter of the housing and wait to be blown back into the extension tube 62 by the blower. Considering that some adhesives will be carried out by the air flow, a number of injection nozzles 632 for sandblasting adhesives onto the surface of the small particle original sand extend into the cyclone separator 631. At the same time, in order to facilitate the regulation of the dosage of the adhesives sandblasted by the injection nozzles 632, a humidity sensor 633 is fixedly arranged in the cyclone separator 631.

[0047] Such as Figure 4 、 Figure 5 And Figure 8As 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.

[0048] 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:

[0049] 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;

[0050] 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;

[0051] 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;

[0052] 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;

[0053] S5: unloading, taking out the mold 3 from the mold box 2;

[0054] 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.

[0055] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0056] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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); 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) gradually absorbs raw sand close to the surface of the mold (3) from an extreme position away from the opening (71) toward the opening (71) until the position where the dual-function component (6) absorbs the raw sand is located at the inner side wall of the mold (3); the dual-function component (6) re-injects the absorbed raw sand into the molding cavity (31); when the dual-function component (6) injects the raw sand into the molding cavity (31), 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); The extreme position is close to the position where the sand-spitting component (5) injects raw sand 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); the bidirectional nozzles are connected to the temporary storage box (63); and 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 disc 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 molding 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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