Lost foam casting device for casting motor casing

Abstract

The invention relates to the field of casting, and discloses an evanescent mode casting device for casting a motor shell. A quartz sand blasting mechanism; and the quartz sand blasting mechanism is arranged above the casting pool, and the quartz sand blasting mechanism is used for uniformly blasting sand and quartz sand into the casting pool and triggering air suction to enable the interior of the casting pool to be in a negative pressure state at the same time. The movement of the piston head causes the change of the internal volume of the piston pipe, gas is extracted from the negative pressure cavity through the exhaust pipe, so that the interior of the casting pool is in a negative pressure state, the one-way valve ensures that the gas can only enter the exhaust pipe from the negative pressure cavity, reverse flow is prevented, and the quartz sand blasting mechanism can uniformly blast sand into the casting pool. And air suction is triggered during sand blasting, so that the interior of the casting pool is in a negative pressure state, the sand blasting process and the negative pressure air exhaust process are synchronously carried out, and the finished product quality of motor shell casting is further improved.

Description

Technical Field

[0001] The present invention relates to the field of casting, and particularly to a lost foam casting device for motor housing casting. Background Art

[0002] As an important structural component of the motor, the quality and performance of the motor housing directly affect the overall performance and lifespan of the motor. Traditional manufacturing methods for motor housings mainly include sand casting, die casting, etc. Lost foam casting technology, also known as evaporative pattern casting or full-mold casting, is an advanced casting technology that overcomes many drawbacks of traditional sand casting. It has advantages such as high dimensional accuracy of castings, high surface finish, high design freedom, simplified casting process flow, and reduced environmental pollution. In recent years, it has been widely used in fields such as automobiles, motorcycles, and construction machinery.

[0003] According to the Chinese authorized patent publication number: CN119747592A, a lost foam casting device for three-wheel load motorcycle motor housing casting is disclosed, which includes a mold, a guiding mechanism, and an adjusting mechanism. The mold includes a lower mold body and an upper mold body. A lower mold core is provided inside the lower mold body, and the lower mold core includes a lower mold shell and a convex mold shell; an upper sand groove is provided inside the upper mold body, and an upper mold core is provided inside the upper sand groove. The upper mold core includes an upper mold shell and a concave shell mold; after the convex mold shell and the concave shell mold are aligned, a cavity matching the pattern is formed; the guiding mechanism is used to maintain the alignment accuracy between the lower mold body and the upper mold body, and the adjusting mechanism is used to adjust the distance between the lower mold shell and the upper mold shell. Through the synergistic effect of the guiding mechanism, alignment pins, and alignment grooves, the present invention realizes the high-precision alignment of the lower mold body and the upper mold body, improves the structural stability of the pattern coated with refractory coating, effectively improves the filling effect of the molten metal, thereby improving the forming quality and qualification rate of the castings, reducing the production cost, and improving the economic benefits of the enterprise. However, there are still deficiencies in this device and the existing lost foam casting devices. Many existing lost foam casting devices adopt fixed sandblasting positions or single sandblasting directions, lacking effective control of the sandblasting trajectory. This results in difficulty in evenly filling quartz sand into various parts of the motor housing foam mold, especially the internal corners and thin-wall parts with complex shapes. It is easy to cause excessive local accumulation of quartz sand, while other areas are under-filled, forming cavities or looseness, seriously affecting the overall uniformity and density of the sand mold, and ultimately affecting the dimensional accuracy and surface quality of the castings. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a lost foam casting device for motor housing casting, which solves the above problems.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A lost foam casting device for motor housing casting, comprising:

[0006] A casting pool;

[0007] Quartz sand sandblasting mechanism; the quartz sand sandblasting mechanism is arranged above the casting pool, and the quartz sand sandblasting mechanism is used to evenly blast quartz sand into the casting pool while triggering suction to make the inside of the casting pool in a negative pressure state. The quartz sand sandblasting mechanism includes a guiding frame, a positioning plate, a single-phase asynchronous motor, a transmission lead screw, a threaded driving ring, a guiding arm, a sandblasting plate, a linkage plate, a linkage rod, a piston head, an air extraction pipe and a piston pipe;

[0008] Compaction assisting mechanism; the compaction assisting mechanism is arranged on both sides of the casting pool, and the compaction assisting mechanism is used to compact quartz sand during the lost foam casting process.

[0009] Preferably, the guiding frame is fixedly connected to the upper end of the rear side of the casting pool. The left and right sides of the upper surface of the guiding frame are fixedly connected with positioning plates. A transmission lead screw is rotatably connected between the left and right positioning plates. Two threaded driving rings are threadedly connected to the outer surface of the transmission lead screw. The upper surfaces of the two threaded driving rings are fixedly connected with guiding arms. The front sides of the two guiding arms are fixedly connected with a sandblasting plate. The front and rear sides of the lower surface of the sandblasting plate are fixedly connected with fixing plates. A sandblasting pipe is fixedly connected between the front and rear fixing plates. A plurality of quartz sand nozzles are arranged on the lower surface of the sandblasting pipe. The lower end of the threaded driving ring is fixedly connected with a connecting slider, and the lower end of the connecting slider is slidably connected to the upper surface of the guiding frame.

[0010] Preferably, the left and right ends of the front side of the guiding arm are fixedly connected with linkage plates. The sides of the left and right linkage plates away from the guiding arm are fixedly connected with linkage rods. The ends of the two linkage rods away from the corresponding linkage plates respectively penetrate into the interiors of the two piston pipes, and the ends of the linkage rods located inside the piston pipes are fixedly connected with piston heads.

[0011] Preferably, an air extraction pipe is arranged on the lower surface of the end of the piston pipe away from the linkage plate. The end of the air extraction pipe away from the piston pipe is connected with a one-way valve, and the air inlet end of the one-way valve is arranged inside the negative pressure chamber.

[0012] Preferably, a fixing ring is fixedly connected to the outer side of the piston tube, the rear side of the fixing ring is fixedly connected to the outer side of the fixing column, a one-way exhaust nozzle is connected to the outer end of the piston tube. Place the prefabricated motor housing foam mold in the casting pool. The single-phase asynchronous motor drives the transmission lead screw to rotate forward and backward. The rotation of the transmission lead screw drives two threaded drive rings to move left and right along the guide frame. The threaded drive rings drive the sandblasting plate to move back and forth through the guide arms. As the sandblasting plate moves back and forth, multiple quartz sand nozzles on the sandblasting pipe start to evenly blast sand into the casting pool. This reciprocating motion enables the quartz sand to be filled around the motor housing foam mold from multiple positions, effectively avoiding local accumulation or voids, ensuring the overall uniformity and density of the sand mold. Additionally, while sandblasting, the linkage rod drives the piston head to move within the piston tube. The movement of the piston head causes a change in the internal volume of the piston tube, and gas is extracted from the negative pressure chamber through the suction pipe, making the casting pool in a negative pressure state. The one-way valve ensures that gas can only enter the suction pipe from the negative pressure chamber, preventing backflow. Since the intake end of the one-way valve is arranged inside the negative pressure chamber, the casting pool can be in a negative pressure state during the suction process, which helps the quartz sand to be evenly filled and tightly formed. The quartz sand sandblasting mechanism can evenly blast sand into the casting pool and trigger suction simultaneously during sandblasting to make the casting pool in a negative pressure state. The sandblasting and negative pressure air extraction processes are carried out synchronously, further improving the finished product quality of the motor housing casting.

[0013] Preferably, the compaction assisting mechanism includes a fixing column, an upper top plate, a hydraulic rod, an extension plate, a compaction plate, and a wedge-shaped guiding pad. The upper top plate is arranged above the outer support. The outer support is fixedly connected to the outer side of the casting pool. Four corners of the lower surface of the upper top plate are fixedly connected with fixing columns, and the lower end of each fixing column is fixedly connected to the upper surface of the outer support.

[0014] Preferably, a hydraulic rod is arranged on the upper surface of the outer support. The fixed end of the hydraulic rod is fixedly connected to the outer support, the free end of the hydraulic rod is drivingly connected with an extension plate, the lower end of the extension plate is fixedly connected to the upper surface of the compaction plate, and the lower surface of the end of the compaction plate away from the extension plate is fixedly connected with a wedge-shaped guiding pad. The lower surface of the wedge-shaped guiding pad is an inclined surface. After the quartz sand sandblasting is completed, the outer surface of the motor housing foam mold has been covered with quartz sand. At this time, start the compaction assisting mechanism. The hydraulic rod pushes the compaction plate to rise. The inclined surface of the wedge-shaped guiding pad closely adheres to and presses the quartz sand on the outer surface of the motor housing foam mold. The design of the inclined surface of the wedge-shaped guiding pad enables the pressure to act more evenly on the quartz sand, avoiding the looseness or non-uniformity of the sand mold caused by excessive or too small local pressure. This compaction assisting mechanism realizes the effective compaction of the quartz sand through the hydraulically driven compaction plate and wedge-shaped guiding pad, improves the density and strength of the sand mold, optimizes the pressure distribution, and improves the casting precision and surface quality.

[0015] Preferably, partition plates are fixedly connected to both the left and right sides inside the casting pool. A negative pressure chamber is provided between the partition plates and the casting pool, and a plurality of air permeable holes are formed on the surface of the partition plates.

[0016] Preferably, a fixed bracket is fixedly connected to the rear side of the casting pool. A sand box cylinder is fixedly connected to the upper surface of the fixed bracket. A sand guiding pump is arranged on the upper surface of the sand box cylinder. The sand inlet end of the sand guiding pump is arranged inside the sand box cylinder. The sand outlet end of the sand guiding pump is connected with a sand guiding pipe. One end of the sand guiding pipe far away from the sand outlet end of the sand guiding pump is connected with a sand blasting pipe.

[0017] Preferably, a motor housing foam mold is arranged inside the casting pool, and a refractory coating is sprayed on the outer surface of the motor housing foam mold.

[0018] The present invention provides a lost foam casting device for motor housing casting. Compared with the prior art, the following beneficial effects are achieved:

[0019] 1. In the present invention, through the provided quartz sand sand blasting mechanism, a prefabricated motor housing foam mold is placed in the casting pool. The single-phase asynchronous motor drives the transmission lead screw to rotate forward and backward. The rotation of the transmission lead screw drives the two threaded drive rings to move left and right along the guide frame. The threaded drive rings drive the sand blasting plate to move back and forth through the guide arms. As the sand blasting plate moves back and forth left and right, a plurality of quartz sand nozzles on the sand blasting pipe start to evenly blast sand into the casting pool. This reciprocating motion enables the quartz sand to be filled around the motor housing foam mold from multiple positions, effectively avoiding local accumulation or voids, ensuring the overall uniformity and density of the sand mold. Additionally, while sand blasting, the linkage rod drives the piston head to move inside the piston pipe. The movement of the piston head causes a change in the internal volume of the piston pipe, and gas is extracted from the negative pressure chamber through the air extraction pipe, making the inside of the casting pool in a negative pressure state. The one-way valve ensures that the gas can only enter the air extraction pipe from the negative pressure chamber, preventing backflow. Since the air inlet end of the one-way valve is arranged inside the negative pressure chamber, the inside of the casting pool can be in a negative pressure state during the air suction process, which helps the quartz sand to be evenly filled and tightly formed. The quartz sand sand blasting mechanism can evenly blast sand into the casting pool and trigger air suction to make the inside of the casting pool in a negative pressure state while sand blasting. The sand blasting and negative pressure air extraction processes are synchronized, further improving the finished product quality of the motor housing casting;

[0020] 2. In the present invention, through the provided compaction assisting mechanism, after the quartz sand sandblasting is completed, the outer surface of the motor housing foam mold is already covered with quartz sand. At this time, the compaction assisting mechanism is started, the hydraulic rod pushes the compaction plate to rise, and the inclined surface of the wedge-shaped guiding pad closely adheres to and presses the quartz sand on the outer surface of the motor housing foam mold. The design of the inclined surface of the wedge-shaped guiding pad enables the pressure to act more uniformly on the quartz sand, avoiding the looseness or unevenness of the sand mold caused by excessive or insufficient local pressure. This compaction assisting mechanism realizes the effective compaction of the quartz sand through the hydraulically driven compaction plate and wedge-shaped guiding pad, improves the density and strength of the sand mold, optimizes the pressure distribution, and improves the casting accuracy and surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 6 is a front-side three-dimensional structural schematic diagram of a lost foam casting device for motor housing casting proposed by the present invention;

[0022] Figure 2 FIG. 7 is a rear-side three-dimensional structural schematic diagram of a lost foam casting device for motor housing casting proposed by the present invention;

[0023] Figure 3 FIG. 8 is a structural schematic diagram of a lost foam casting device for motor housing casting proposed by the present invention from a front-upper perspective;

[0024] Figure 4 FIG. 9 is a right-side three-dimensional structural schematic diagram of the quartz sand sandblasting mechanism in a lost foam casting device for motor housing casting proposed by the present invention;

[0025] Figure 5 FIG. 10 is a left-side three-dimensional structural schematic diagram of the quartz sand sandblasting mechanism in a lost foam casting device for motor housing casting proposed by the present invention;

[0026] Figure 6 FIG. 11 is a lost foam casting device for motor housing casting proposed by the present invention Figure 3 The enlarged view of A in;

[0027] Figure 7 FIG. 12 is a structural schematic diagram of the casting pool in a lost foam casting device for motor housing casting proposed by the present invention;

[0028] Figure 8 FIG. 13 is a sectional structural schematic diagram of the piston tube in a lost foam casting device for motor housing casting proposed by the present invention.

[0029] LEGEND DESCRIPTION:

[0030] 1. Foundry pool; 2. Fixed support; 3. Sand box cylinder; 4. Quartz sand sandblasting mechanism; 401. Guide frame; 402. Positioning plate; 403. Single-phase asynchronous motor; 404. Transmission lead screw; 405. Thread driving ring; 406. Connecting slider; 407. Guide arm; 408. Sandblasting plate; 409. Sandblasting pipe; 410. Fixed plate; 411. Quartz sand nozzle; 412. Linking plate; 413. Linking rod; 414. Piston head; 415. Air extraction pipe; 416. Check valve; 417. One-way exhaust nozzle; 418. Piston pipe; 5. Compaction auxiliary mechanism; 501. Fixed column; 502. Upper top plate; 503. Hydraulic rod; 504. Extension plate; 505. Compaction plate; 506. Wedge-shaped guide pad; 6. Motor housing foam mold; 7. Outer support; 8. Negative pressure chamber; 9. Partition board; 10. Ventilation hole; 11. Sand guiding pump; 12. Sand guiding pipe; 13. Fixed ring. Detailed implementation manners

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-8 , the present invention provides two technical solutions, specifically including the following embodiments:

[0033] Embodiment 1: A lost foam casting device for casting a motor housing, comprising: a casting pool 1; a quartz sand sandblasting mechanism 4; the quartz sand sandblasting mechanism 4 is arranged above the casting pool 1, and the quartz sand sandblasting mechanism 4 is used for evenly sandblasting quartz sand into the casting pool 1 while triggering suction to make the inside of the casting pool 1 in a negative pressure state. The quartz sand sandblasting mechanism 4 includes a guiding frame 401, a positioning plate 402, a single-phase asynchronous motor 403, a transmission lead screw 404, a threaded driving ring 405, a guiding arm 407, a sandblasting plate 408, a linkage plate 412, a linkage rod 413, a piston head 414, an air extraction pipe 415 and a piston pipe 418. The guiding frame 401 is fixedly connected to the upper rear end of the casting pool 1. The left and right sides of the upper surface of the guiding frame 401 are fixedly connected with positioning plates 402. A transmission lead screw 404 is rotatably connected between the left and right positioning plates 402. Two threaded driving rings 405 are threadedly connected to the outer surface of the transmission lead screw 404. The upper surfaces of the two threaded driving rings 405 are fixedly connected with guiding arms 407. The front sides of the two guiding arms 407 are fixedly connected with a sandblasting plate 408. The front and rear sides of the lower surface of the sandblasting plate 408 are fixedly connected with fixing plates 410. A sandblasting pipe 409 is fixedly connected between the front and rear fixing plates 410. A plurality of quartz sand nozzles 411 are arranged on the lower surface of the sandblasting pipe 409. The lower end of the threaded driving ring 405 is fixedly connected with a connecting slider 406. The lower end of the connecting slider 406 is slidably connected to the upper surface of the guiding frame 401. The left and right ends of the front side of the guiding arm 407 are fixedly connected with linkage plates 412. The sides of the left and right linkage plates 412 away from the guiding arm 407 are fixedly connected with linkage rods 413. The ends of the two linkage rods 413 away from the corresponding linkage plates 412 are respectively arranged inside the two piston pipes 418, and the ends of the linkage rods 413 located inside the piston pipes 418 are fixedly connected with piston heads 414. The lower surface of the end of the piston pipe 418 away from the linkage plate 412 is provided with an air extraction pipe 415. The end of the air extraction pipe 415 away from the piston pipe 418 is connected with a one-way valve 416. The air inlet end of the one-way valve 416 is arranged inside the negative pressure chamber 8. A fixing ring 13 is fixedly connected to the outside of the piston pipe 418. The rear side of the fixing ring 13 is fixedly connected to the outside of the fixing column 501. The outer end of the piston pipe 418 is connected with a one-way exhaust nozzle 417. The left and right sides inside the casting pool 1 are fixedly connected with partition plates 9. A negative pressure chamber 8 is arranged between the partition plates 9 and the casting pool 1. A plurality of air permeable holes 10 are formed on the surface of the partition plates 9. The rear side of the casting pool 1 is fixedly connected with a fixing bracket 2. A sand box cylinder 3 is fixedly connected to the upper surface of the fixing bracket 2. A sand guiding pump 11 is arranged on the upper surface of the sand box cylinder 3. The sand inlet end of the sand guiding pump 11 is arranged inside the sand box cylinder 3. The sand outlet end of the sand guiding pump 11 is connected with a sand guiding pipe 12. The end of the sand guiding pipe 12 away from the sand outlet end of the sand guiding pump 11 is connected with the sandblasting pipe 409. The sand guiding pump 11 is used for pumping the quartz sand inside the sand box cylinder 3 into the sandblasting pipe 409 and spraying it into the casting pool 1 through the quartz sand nozzles 411.

[0034] During operation, the prefabricated foam mold 6 of the motor housing is placed in the casting pool 1. The single-phase asynchronous motor 403 drives the transmission lead screw 404 to rotate forward and backward. The rotation of the transmission lead screw 404 drives the two threaded drive rings 405 to move left and right along the guide frame 401. The threaded drive rings 405 drive the sandblasting plate 408 to move back and forth through the guide arms 407. As the sandblasting plate 408 moves reciprocally left and right, multiple quartz sand nozzles 411 on the sandblasting pipe 409 start to evenly spray sand into the casting pool 1. This reciprocating motion enables the quartz sand to fill around the foam mold 6 of the motor housing from multiple positions, effectively avoiding local accumulation or voids, and ensuring the overall uniformity and density of the sand mold. Additionally, during sandblasting, the linkage rod 413 drives the piston head 414 to move within the piston pipe 418. The movement of the piston head 414 causes a change in the internal volume of the piston pipe 418, and gas is extracted from the negative pressure chamber 8 through the air extraction pipe 415, making the inside of the casting pool 1 in a negative pressure state. The one-way valve 416 ensures that gas can only enter the air extraction pipe 415 from the negative pressure chamber 8, preventing backflow. Since the intake end of the one-way valve 416 is arranged inside the negative pressure chamber 8, the inside of the casting pool 1 can be in a negative pressure state during the air intake process, which helps the uniform filling and tight molding of the quartz sand. The quartz sand sandblasting mechanism 4 can evenly spray sand into the casting pool 1 and trigger air intake during sandblasting to make the inside of the casting pool 1 in a negative pressure state. The sandblasting and negative pressure air extraction processes are carried out synchronously, further improving the finished product quality of the motor housing casting.

[0035] Embodiment 2: On the basis of Embodiment 1, there is a compaction assisting mechanism 5; the compaction assisting mechanism 5 is arranged on both sides of the casting pool 1 and is used to compact the quartz sand during the lost foam casting process. The compaction assisting mechanism 5 includes a fixed column 501, an upper top plate 502, a hydraulic rod 503, an extension plate 504, a compaction plate 505 and a wedge-shaped guiding pad 506. The upper top plate 502 is arranged above the outer support 7, and the outer support 7 is fixedly connected to the outside of the casting pool 1. Fixed columns 501 are fixedly connected to the four corners of the lower surface of the upper top plate 502, and the lower end of each fixed column 501 is fixedly connected to the upper surface of the outer support 7. A hydraulic rod 503 is arranged on the upper surface of the outer support 7. The fixed end of the hydraulic rod 503 is fixedly connected to the outer support 7, and the free end of the hydraulic rod 503 is drivingly connected to an extension plate 504. The lower end of the extension plate 504 is fixedly connected to the upper surface of the compaction plate 505. A wedge-shaped guiding pad 506 is fixedly connected to the lower surface of the end of the compaction plate 505 away from the extension plate 504. The lower surface of the wedge-shaped guiding pad 506 is an inclined surface. After the quartz sand is blasted, the outer surface of the motor housing foam mold 6 has been covered with quartz sand. At this time, start the compaction assisting mechanism 5, and the hydraulic rod 503 pushes the compaction plate 505 to rise. The inclined surface of the wedge-shaped guiding pad 506 closely adheres to and presses the quartz sand on the outer surface of the motor housing foam mold 6. The inclined surface design of the wedge-shaped guiding pad 506 enables the pressure to act more evenly on the quartz sand, avoiding the looseness or unevenness of the sand mold caused by excessive or too little local pressure. This compaction assisting mechanism 5 realizes the effective compaction of the quartz sand through the hydraulically driven compaction plate 505 and the wedge-shaped guiding pad 506, improves the density and strength of the sand mold, optimizes the pressure distribution, improves the casting accuracy and surface quality. There is a motor housing foam mold 6 arranged inside the casting pool 1, and a refractory coating is sprayed on the outer surface of the motor housing foam mold 6. The refractory coating is used to prevent the molten metal from penetrating into the sand mold. Before the quartz sand completely covers the motor housing foam mold 6, insert the molten metal liquid guiding pipe into the quartz sand covering area of the motor housing foam mold 6, and pour the melted molten metal (such as aluminum, iron, etc.) into the sand mold. The high-temperature molten metal quickly vaporizes the motor housing foam mold 6, and the molten metal replaces the original spatial position of the motor housing foam mold 6. After the molten metal cools and solidifies, remove the negative pressure to make the sand mold lose its strength, take out the casting from the sand mold, remove the floating sand on the surface, and perform subsequent heat treatment, machining and other processes as required to obtain the final motor housing casting.

[0036] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the application shall be included in the protection scope of the present application.

Claims

1. A lost foam casting device for casting motor shells, characterized in that: Including: Casting pool (1); Quartz sand sandblasting mechanism (4); The quartz sand sandblasting mechanism (4) is arranged above the casting pool (1), and the quartz sand sandblasting mechanism (4) is used for evenly sandblasting quartz sand into the casting pool (1) while triggering suction to make the inside of the casting pool (1) in a negative pressure state. The quartz sand sandblasting mechanism (4) includes a guide frame (401), a positioning plate (402), a single-phase asynchronous motor (403), a transmission lead screw (404), a threaded drive ring (405), a guide arm (407), a sandblasting plate (408), a linkage plate (412), a linkage rod (413), a piston head (414), an air extraction pipe (415) and a piston pipe (418); Compaction assisting mechanism (5); The compaction assisting mechanism (5) is arranged on both sides of the casting pool (1), and the compaction assisting mechanism (5) is used for compacting quartz sand during the lost foam casting process.

2. The lost foam casting device for motor housing casting according to claim 1, wherein: The guide frame (401) is fixedly connected to the upper rear end of the casting pool (1). The upper surface of the guide frame (401) is fixedly connected with positioning plates (402) on both the left and right sides. A transmission lead screw (404) is rotatably connected between the two left and right positioning plates (402). Two threaded drive rings (405) are threadedly connected to the outer surface of the transmission lead screw (404). The upper surfaces of the two threaded drive rings (405) are fixedly connected with guide arms (407). The front sides of the two guide arms (407) are fixedly connected with a sandblasting plate (408). The lower surface of the sandblasting plate (408) is fixedly connected with fixing plates (410) on both the front and rear sides. A sandblasting pipe (409) is fixedly connected between the two front and rear fixing plates (410). A plurality of quartz sand nozzles (411) are arranged on the lower surface of the sandblasting pipe (409). The lower end of the threaded drive ring (405) is fixedly connected with a connecting slider (406), and the lower end of the connecting slider (406) is slidably connected to the upper surface of the guide frame (401).

3. The lost foam casting device for motor housing casting according to claim 2, characterized in that: The front sides of the left and right ends of the guide arm (407) are fixedly connected with linkage plates (412). Linkage rods (413) are fixedly connected to the sides of the two left and right linkage plates (412) far away from the guide arm (407). The ends of the two linkage rods (413) far away from the corresponding linkage plates (412) respectively penetrate into the interiors of the two piston pipes (418), and the ends of the linkage rods (413) located inside the piston pipes (418) are fixedly connected with piston heads (414).

4. A lost foam casting device for motor housing casting according to claim 3, characterized in that: The lower surface of the end of the piston pipe (418) far away from the linkage plate (412) is provided with an air extraction pipe (415). The end of the air extraction pipe (415) far away from the piston pipe (418) is connected with a one-way valve (416), and the air inlet end of the one-way valve (416) is arranged inside the negative pressure chamber (8).

5. The lost foam casting device for motor housing casting according to claim 4, characterized in that: A fixing ring (13) is fixedly connected to the outer side of the piston pipe (418). The rear side of the fixing ring (13) is fixedly connected to the outer side of a fixing column (501). The outer end of the piston pipe (418) is connected with a one-way exhaust nozzle (417).

6. The lost foam casting device for motor housing casting according to claim 1, characterized in that: The compaction assisting mechanism (5) includes a fixed column (501), an upper top plate (502), a hydraulic rod (503), an extension plate (504), a compaction plate (505) and a wedge-shaped guiding pad (506). The upper top plate (502) is arranged above the outer support (7), and the outer support (7) is fixedly connected to the outer side of the casting pool (1). Fixed columns (501) are fixedly connected to the four corners of the lower surface of the upper top plate (502), and the lower end of each fixed column (501) is fixedly connected to the upper surface of the outer support (7).

7. A lost foam casting device for casting a motor housing according to claim 6, characterized in that: A hydraulic rod (503) is arranged on the upper surface of the outer support (7). The fixed end of the hydraulic rod (503) is fixedly connected to the outer support (7), and the free end of the hydraulic rod (503) is drivingly connected to an extension plate (504). The lower end of the extension plate (504) is fixedly connected to the upper surface of the compaction plate (505). A wedge-shaped guiding pad (506) is fixedly connected to the lower surface of the end of the compaction plate (505) away from the extension plate (504), and the lower surface of the wedge-shaped guiding pad (506) is an inclined surface.

8. A lost foam casting device for motor housing casting according to claim 1, characterized in that: Partition plates (9) are fixedly connected to both the left and right sides inside the casting pool (1). A negative pressure cavity (8) is arranged between the partition plates (9) and the casting pool (1), and a plurality of air permeable holes (10) are formed on the surfaces of the partition plates (9).

9. The lost foam casting device for casting a motor housing according to claim 1, wherein: A fixed support (2) is fixedly connected to the rear side of the casting pool (1). A sand box cylinder (3) is fixedly connected to the upper surface of the fixed support (2). A sand guiding pump (11) is arranged on the upper surface of the sand box cylinder (3). The sand inlet end of the sand guiding pump (11) is arranged inside the sand box cylinder (3). The sand outlet end of the sand guiding pump (11) is connected to a sand guiding pipe (12), and one end of the sand guiding pipe (12) away from the sand outlet end of the sand guiding pump (11) is connected to a sand blasting pipe (409).

10. A lost foam casting device for casting a motor housing according to claim 1, characterized in that: A motor housing foam mold (6) is arranged inside the casting pool (1), and a refractory coating is sprayed on the outer surface of the motor housing foam mold (6).

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