A lost foam casting device for motor shell casting

Abstract

The application relates to the casting field and discloses a lost foam casting device for motor shell casting, which comprises a casting pool and a quartz sand sandblasting mechanism; the quartz sand sandblasting mechanism is arranged above the casting pool and is used for uniformly spraying quartz sand into the casting pool and triggering air suction to make the casting pool in a negative pressure state; in the application, the quartz sand sandblasting mechanism is arranged; the linkage rod drives the piston head to move in the piston pipe while spraying sand; the movement of the piston head causes the volume change of the piston pipe; the gas in the negative pressure cavity is extracted through the air extraction pipe to make 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 cavity to prevent backflow; the quartz sand sandblasting mechanism can uniformly spray sand into the casting pool and trigger air suction to make the casting pool in a negative pressure state while spraying sand; the sand spraying and negative pressure air extraction processes are synchronous, and the finished product quality of the motor shell casting is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of casting, in particular to a lost foam casting device for motor shell casting. BACKGROUND

[0002] The motor shell is an important structural part of the motor, and its quality and performance directly affect the overall performance and service life of the motor. The traditional motor shell manufacturing method mainly includes sand casting, die casting, etc. The lost foam casting technology, also known as gasification mold casting or full mold casting, is an advanced casting technology that overcomes many shortcomings of traditional sand casting. It has the advantages of high casting size precision, high surface finish, high design freedom, simplified casting process, reduced environmental pollution, etc. and has been widely used in the fields of automobiles, motorcycles, engineering machinery, etc. in recent years.

[0003] According to the authorized patent announcement number CN119747592A, a lost foam casting device for three-wheeled motor vehicle motor shell casting is disclosed, which comprises a mold, a guide mechanism and an adjusting mechanism. The mold comprises a lower mold body and an upper mold body. A lower mold core is arranged in the lower mold body. The lower mold core comprises a lower mold shell and a convex mold shell. An upper sand groove is arranged in the upper mold body. An upper mold core is arranged in the upper sand groove. The upper mold core comprises an upper mold shell and a concave shell mold. The convex mold shell and the concave shell mold form a cavity matched with the mold after being closed. The guide mechanism is used to maintain the closing precision of the lower mold body and the upper mold body. The adjusting mechanism is used to adjust the distance between the lower mold shell and the upper mold shell. The present application realizes high-precision closing of the lower mold body and the upper mold body through the synergistic effect of the guide mechanism, the closing pin and the closing groove, improves the structural stability of the mold coating refractory coating, effectively improves the filling effect of the metal liquid, thereby improving the forming quality and the qualification rate of the casting, reducing the production cost and improving the economic benefit of the enterprise. However, the device and the existing lost foam casting device still have some deficiencies. Many existing lost foam casting devices use fixed sandblasting positions or single sandblasting directions, and lack effective sandblasting trajectory control. This leads to difficulty in uniformly filling quartz sand into each part of the motor shell foam mold, especially in complex internal corners and thin-walled parts, which easily causes excessive accumulation of quartz sand in some parts, while other areas are not filled enough, forming voids or porosity, which seriously affects the overall uniformity and density of the sand mold, and ultimately affects the dimensional accuracy and surface quality of the casting. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a lost foam casting device for motor shell casting, which solves the above problems.

[0005] To achieve the above purpose, the present application is implemented by the following technical scheme: a lost foam casting device for motor shell casting, comprising:

[0006] a casting pool;

[0007] The quartz sand spraying mechanism is arranged above the casting pool and is used for spraying quartz sand into the casting pool uniformly and triggering air suction to make the casting pool in a negative pressure state, and the quartz sand spraying mechanism comprises a guide frame, a positioning plate, a single-phase asynchronous motor, a transmission screw rod, a threaded drive ring, a guide arm, a sand spraying plate, a linkage plate, a linkage rod, a piston head, an air suction pipe and a piston pipe.

[0008] The compaction auxiliary mechanism is arranged on both sides of the casting pool and is used for compacting quartz sand in the lost foam casting process.

[0009] Preferably, the guide frame is fixedly connected to the upper end of the rear side of the casting pool, the upper surface of the guide frame is fixedly connected with the positioning plates on the left and right sides, the transmission screw rod is rotatably connected to the middle of the left and right positioning plates, the outer surface of the transmission screw rod is threadedly connected with the two threaded drive rings, the upper surface of each of the two threaded drive rings is fixedly connected with the guide arm, the front side of each of the two guide arms is fixedly connected with the sand spraying plate, the lower surface of the sand spraying plate is fixedly connected with the fixed plates on the front and rear sides, the middle of the front and rear fixed plates is fixedly connected with the sand spraying pipe, the lower surface of the sand spraying pipe is provided with a plurality of quartz sand nozzles, the lower end of the threaded drive ring is fixedly connected with the connecting sliding block, and the lower end of the connecting sliding block is slidably connected to the upper surface of the guide frame.

[0010] Preferably, the front side of each of the guide arms is fixedly connected with the linkage plate on the left and right ends, the side of each of the left and right linkage plates away from the guide arm is fixedly connected with the linkage rod, one end of each of the two linkage rods away from the corresponding linkage plate is arranged to penetrate into the interior of the piston pipe, and the end of the linkage rod arranged in the interior of the piston pipe is fixedly connected with the piston head.

[0011] Preferably, the lower surface of the end of the piston pipe away from the linkage plate is provided with the air suction pipe, the end of the air suction pipe away from the piston pipe is connected with the one-way valve, and the air inlet end of the one-way valve is arranged in the interior of the negative pressure cavity.

[0012] Preferably, the outer side of the piston pipe is fixedly connected with a fixed ring, the rear side of the fixed ring is fixedly connected with the outer side of the fixed column, the outer end of the piston pipe is connected with a one-way exhaust nozzle, the prefabricated motor shell foam mold is placed in the casting pool, the single-phase asynchronous motor drives the transmission screw to rotate forward and backward, the rotation of the transmission 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 forward and backward through the guide arm, as the sand blasting plate reciprocates left and right, the multiple quartz sand nozzles on the sand blasting pipe start to uniformly blast sand into the casting pool, such reciprocating movement enables the quartz sand to be filled from multiple positions around the motor shell foam mold, effectively avoiding local accumulation or cavities, ensuring the overall uniformity and compactness of the sand mold, in addition, while sand blasting, the linkage rod drives the piston head to move in the piston pipe, the movement of the piston head changes the internal volume of the piston pipe, gas is extracted from the negative pressure chamber through the suction pipe to make 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 to prevent backflow, as the air inlet 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 air suction process, which helps the uniform filling and tight molding of the quartz sand, the quartz sand blasting mechanism can uniformly blast sand into the casting pool, and the casting pool is in a negative pressure state at the same time of sand blasting, the sand blasting and negative pressure suction process are carried out synchronously, further improving the finished product quality of the motor shell casting.

[0013] Preferably, the compaction auxiliary mechanism comprises a fixed column, an upper top plate, a hydraulic rod, an extension plate, a compaction plate and a wedge-shaped guide 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, the lower surface of the upper top plate is fixedly connected with the fixed column at four corners, and the lower end of each fixed column is fixedly connected to the upper surface of the outer support.

[0014] Preferably, the upper surface of the outer support is provided with a hydraulic rod, the fixed end of the hydraulic rod is fixedly connected with 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, the lower surface of the end of the compaction plate away from the extension plate is fixedly connected with a wedge-shaped guide pad, and the lower surface of the wedge-shaped guide pad is an inclined surface, after the quartz sand blasting is completed, the outer surface of the motor shell foam mold has been covered with quartz sand, at this time, the compaction auxiliary mechanism is started, the hydraulic rod pushes the compaction plate to rise downward, the inclined surface of the wedge-shaped guide pad tightly abuts and presses the quartz sand on the outer surface of the motor shell foam mold, the design of the inclined surface of the wedge-shaped guide pad enables the pressure to act more uniformly on the quartz sand, avoiding loose or uneven sand mold caused by local excessive or insufficient pressure, the compaction auxiliary mechanism realizes effective compaction of the quartz sand through the hydraulic driving compaction plate and wedge-shaped guide pad, improves the compactness and strength of the sand mold, optimizes the pressure distribution, and improves the casting precision and surface quality.

[0015] Preferably, the left and right sides of the casting pool are fixedly connected with the partition plates, the negative pressure cavities are arranged between the partition plates and the casting pool, and a plurality of air holes are arranged on the surface of the partition plate.

[0016] Preferably, the rear side of the casting pool is fixedly connected with the fixed support, the sand box barrel is fixedly connected to the upper surface of the fixed support, the sand guide pump is arranged on the upper surface of the sand box barrel, the sand inlet end of the sand guide pump is arranged in the sand box barrel, the sand outlet end of the sand guide pump is connected with the sand guide pipe, and the end, away from the sand outlet end of the sand guide pipe, is connected with the sand blasting pipe.

[0017] Preferably, the motor shell foam mold is arranged in the casting pool, and the outer surface of the motor shell foam mold is sprayed with refractory paint.

[0018] The application provides a lost foam casting device for motor shell casting.

[0019] 1、in the application, the quartz sand blasting mechanism is arranged, the prefabricated motor shell foam mold is placed in the casting pool, the single-phase asynchronous motor drives the transmission screw to rotate forward and backward, the rotation of the transmission screw drives the two threaded drive rings to move left and right along the guide frame, the threaded drive rings drive the sand blasting plates to move forward and backward through the guide arms, with the reciprocating movement of the sand blasting plates, the plurality of quartz sand nozzles on the sand blasting pipe start to uniformly spray sand into the casting pool, the reciprocating movement enables the quartz sand to be filled around the motor shell foam mold from multiple positions, effectively avoiding local accumulation or hollow, and ensuring the overall uniformity and compactness of the sand mold, in addition, during the sand blasting, the linkage rod drives the piston head to move in the piston pipe, the movement of the piston head causes the volume of the piston pipe to change, the gas is extracted from the negative pressure cavity through the suction pipe, the casting pool is in a negative pressure state, the one-way valve ensures that the gas can only enter the suction pipe from the negative pressure cavity, preventing backflow, since the gas inlet end of the one-way valve is arranged in the negative pressure cavity, the casting pool can be in a negative pressure state during the gas suction process, which is helpful for uniform filling and tight forming of the quartz sand, the quartz sand blasting mechanism can uniformly spray sand into the casting pool, and the gas suction is triggered at the same time of the sand blasting, so that the casting pool is in a negative pressure state, the sand blasting and negative pressure suction process are synchronous, and the finished product quality of the motor shell casting is further improved.

[0020] 2、The motor shell foaming mold outer surface has been covered by quartz sand after quartz sand blasting is completed, at the moment, the compaction auxiliary mechanism is started, the hydraulic rod pushes the compaction plate to go up, the inclined surface of the wedge-shaped guide pad is close to and presses the quartz sand on the motor shell foaming mold outer surface, the inclined surface of the wedge-shaped guide pad is designed so that the pressure can be more uniformly applied to the quartz sand, the loose or uneven sand mold caused by excessive or insufficient local pressure is avoided, the compaction auxiliary mechanism realizes effective compaction of the quartz sand through the hydraulic driving compaction plate and wedge-shaped guide pad, the compactness and strength of the sand mold are improved, the pressure distribution is optimized, and the casting precision and surface quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A front side three-dimensional structure schematic view of a lost foam casting device for motor shell casting is provided for the present application.

[0022] Figure 2 A rear side three-dimensional structure schematic view of a lost foam casting device for motor shell casting is provided for the present application.

[0023] Figure 3 A front upper perspective view structure schematic view of a lost foam casting device for motor shell casting is provided for the present application.

[0024] Figure 4 A right side three-dimensional structure schematic view of a quartz sand blasting mechanism in a lost foam casting device for motor shell casting is provided for the present application.

[0025] Figure 5 A left side three-dimensional structure schematic view of a quartz sand blasting mechanism in a lost foam casting device for motor shell casting is provided for the present application.

[0026] Figure 6 A lost foam casting device for motor shell casting is provided for the present application. Figure 3 An enlarged view of A in the lost foam casting device for motor shell casting is provided for the present application.

[0027] Figure 7 A structure schematic view of a casting pool in a lost foam casting device for motor shell casting is provided for the present application.

[0028] Figure 8 A cross-sectional structure schematic view of a piston pipe in a lost foam casting device for motor shell casting is provided for the present application.

[0029] LEGEND:

[0030] 1, Foundry basin; 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 screw; 405, Threaded drive ring; 406, Connecting slider; 407, Guide arm; 408, Sandblasting plate; 409, Sandblasting pipe; 410, Fixed plate; 411, Quartz sand nozzle; 412, Linkage plate; 413, Linkage rod; 414, Piston head; 415, Air suction pipe; 416, One-way 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 shell foam mold; 7, Outer support; 8, Negative pressure cavity; 9, Partition; 10, Air vent; 11, Sand guide pump; 12, Sand guide pipe; 13, Fixed ring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

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

[0033] The embodiment one is a lost foam casting device for motor shell casting, comprising a casting pool 1, a quartz sand spraying mechanism 4, the quartz sand spraying mechanism 4 is arranged above the casting pool 1, the quartz sand spraying mechanism 4 is used for triggering air suction to make the casting pool 1 in a negative pressure state while uniformly spraying quartz sand into the casting pool 1, the quartz sand spraying mechanism 4 comprises a guide frame 401, a positioning plate 402, a single-phase asynchronous motor 403, a transmission screw rod 404, a threaded drive ring 405, a guide arm 407, a sand spraying 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 guide frame 401 is fixedly connected to the rear upper end of the casting pool 1, the positioning plates 402 are fixedly connected to the left and right sides of the upper surface of the guide frame 401, the transmission screw rod 404 is rotatably connected to the middle of the left and right positioning plates 402, the threaded drive rings 405 are threadedly connected to the outer surface of the transmission screw rod 404, the guide arms 407 are fixedly connected to the upper surfaces of the two threaded drive rings 405, the sand spraying plates 408 are fixedly connected to the front sides of the two guide arms 407, the fixed plates 410 are fixedly connected to the lower surface of the sand spraying plate 408, the sand spraying pipes 409 are fixedly connected to the middle of the front and rear fixed plates 410, the quartz sand nozzles 411 are arranged on the lower surface of the sand spraying pipes 409, the connection sliding blocks 406 are fixedly connected to the lower ends of the threaded drive rings 405, the connection sliding blocks 406 are slidably connected to the upper surface of the guide frame 401, the linkage plates 412 are fixedly connected to the left and right ends of the front side of the guide arms 407, the linkage rods 413 are fixedly connected to the sides, away from the guide arms 407, of the left and right linkage plates 412, the linkage rods 413 pass through the interiors of the two piston pipes 418, the piston heads 414 are fixedly connected to the ends of the linkage rods 413 in the interiors of the piston pipes 418, the air extraction pipes 415 are arranged on the lower surfaces of the ends, away from the linkage plates 412, of the piston pipes 418, the one-way valves 416 are connected to the ends, away from the piston pipes 418, of the air extraction pipes 415, the air inlet ends of the one-way valves 416 are arranged in the interior of the negative pressure cavity 8, the fixed rings 13 are fixedly connected to the outer sides of the piston pipes 418, the rear sides of the fixed rings 13 are fixedly connected to the outer sides of the fixed columns 501, the one-way exhaust nozzles 417 are connected to the outer ends of the piston pipes 418, the partition plates 9 are fixedly connected to the left and right sides of the interior of the casting pool 1, the negative pressure cavities 8 are arranged between the partition plates 9 and the casting pool 1, a plurality of air permeation holes 10 are arranged on the surface of the partition plate 9, the fixed supports 2 are fixedly connected to the rear side of the casting pool 1, the sand box cylinders 3 are fixedly connected to the upper surface of the fixed supports 2, the sand pumps 11 are arranged on the upper surface of the sand box cylinders 3, the sand inlet ends of the sand pumps 11 are arranged in the interior of the sand box cylinders 3, the sand outlet ends of the sand pumps 11 are connected to the sand pipes 12, the sand pipes 12 are connected to the sand spraying pipes 409, the sand pumps 11 are used for pumping the quartz sand in the interior of the sand box cylinders 3 into the sand spraying pipes 409 and spraying the quartz sand into the casting pool 1 through the quartz sand nozzles 411.

[0034] In operation, the prefabricated motor shell foam mold 6 is placed in the casting pool 1, the single-phase asynchronous motor 403 drives the transmission screw rod 404 to rotate forward and backward, the rotation of the transmission screw rod 404 drives the two threaded drive rings 405 to move left and right along the guide frame 401, the threaded drive ring 405 drives the sandblasting plate 408 to move forward and backward through the guide arm 407, with the reciprocating movement of the sandblasting plate 408 left and right, the multiple quartz sand nozzles 411 on the sandblasting pipe 409 begin to uniformly sandblast into the casting pool 1, this reciprocating movement enables the quartz sand to fill around the motor shell foam mold 6 from multiple positions, effectively avoiding local accumulation or voids, ensuring the overall uniformity and compactness of the sand mold, in addition, at the same time of sandblasting, the linkage rod 413 drives the piston head 414 to move in the piston tube 418, the movement of the piston head 414 causes the internal volume of the piston tube 418 to change, gas is extracted from the negative pressure chamber 8 through the suction pipe 415, so that the casting pool 1 is in a negative pressure state, the one-way valve 416 ensures that gas can only enter the suction pipe 415 from the negative pressure chamber 8, preventing backflow, since the gas inlet end of the one-way valve 416 is arranged inside the negative pressure chamber 8, the casting pool 1 can be in a negative pressure state during the gas suction process, which is helpful for uniform filling and tight forming of the quartz sand, the quartz sand sandblasting mechanism 4 can uniformly sandblast into the casting pool 1, and at the same time of sandblasting, suction is triggered to make the casting pool 1 in a negative pressure state, the sandblasting and negative pressure suction process are synchronous, further improving the finished product quality of the motor shell casting.

[0035] In the embodiment two, the compacting auxiliary mechanism 5 is arranged on both sides of the casting pool 1, and is used for compacting the quartz sand in the process of the lost foam casting. The compacting auxiliary mechanism 5 comprises a fixed column 501, an upper top plate 502, a hydraulic rod 503, an extension plate 504, a compacting plate 505 and a wedge-shaped guide pad 506. The upper top plate 502 is arranged above the outer support 7 which is fixedly connected to the outer side of the casting pool 1. The upper surface of the outer support 7 is provided with the hydraulic rod 503, and the fixed end of the hydraulic rod 503 is fixedly connected to the outer support 7. The free end of the hydraulic rod 503 is drivingly connected with the extension plate 504. The lower end of the extension plate 504 is fixedly connected to the upper surface of the compacting plate 505. The lower surface of the end of the compacting plate 505 away from the extension plate 504 is fixedly connected with the wedge-shaped guide pad 506. The lower surface of the wedge-shaped guide pad 506 is an inclined surface. After the sandblasting of the quartz sand is completed, the outer surface of the motor shell foam mold 6 has been covered by the quartz sand. At this time, the compacting auxiliary mechanism 5 is started. The hydraulic rod 503 pushes the compacting plate 505 to rise. The inclined surface of the wedge-shaped guide pad 506 tightly abuts and presses the quartz sand on the outer surface of the motor shell foam mold 6. The design of the inclined surface of the wedge-shaped guide pad 506 enables the pressure to be more uniformly applied to the quartz sand, avoiding the loose or uneven sand mold caused by the local pressure being too large or too small. The compacting auxiliary mechanism 5 realizes the effective compaction of the quartz sand through the hydraulic driving compacting plate 505 and the wedge-shaped guide pad 506, improves the compactness and strength of the sand mold, optimizes the pressure distribution, improves the casting precision and surface quality, and the casting pool 1 is internally provided with the motor shell foam mold 6. The outer surface of the motor shell foam mold 6 is sprayed with refractory coating which is used for preventing the metal liquid from penetrating into the sand mold. Before the quartz sand completely covers the motor shell foam mold 6, the metal liquid guide pipe is inserted into the quartz sand covered area of the motor shell foam mold 6. The smelted metal liquid (such as aluminum, iron, etc.) is poured into the sand mold. The high-temperature metal liquid makes the motor shell foam mold 6 rapidly gasify. The metal liquid replaces the original space position of the motor shell foam mold 6. After the metal liquid cools and solidifies, the negative pressure is removed, the sand mold loses strength, the casting is taken out of the sand mold, the surface floating sand is removed, and the subsequent heat treatment, machining and other processes are carried out according to the needs to obtain the final motor shell casting.

[0036] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the present application.

Claims

1. A lost foam casting device for motor housing casting, characterized by: include: Casting Pool (1); A quartz sand blasting mechanism (4); the quartz sand blasting mechanism (4) is arranged above the casting pool (1), and is used for uniformly blasting quartz sand into the casting pool (1) while triggering suction to place the casting pool (1) in a negative pressure state. The quartz sand blasting mechanism (4) comprises a guide frame (401), a positioning plate (402), a single-phase asynchronous motor (403), a transmission screw (404), a threaded drive ring (405), a guide arm (407), a blasting plate (408), a linkage plate (412), a linkage rod (413), a piston head (414), an exhaust pipe (415), and a piston tube (418); A compaction auxiliary mechanism (5); the compaction auxiliary mechanism (5) is arranged on both sides of the casting pool (1), and the compaction auxiliary mechanism (5) is used to compact quartz sand during the lost foam casting process; The guide frame (401) is fixedly connected to the upper end of the rear side of the casting pool (1), and the left and right sides of the upper surface of the guide frame (401) are fixedly connected with positioning plates (402), and the middle of the left and right positioning plates (402) is rotatably connected with a transmission screw (404), the outer surface of the transmission screw (404) is threadedly connected with two threaded drive rings (405), and the upper surfaces of the two threaded drive rings (405) are fixedly connected with guide arms (407), and the front sides of the two guide arms (407) are fixedly connected with sandblasting plates (408), and the front and rear sides of the lower surface of the sandblasting plates (408) are fixedly connected with fixed plates (410), and the middle of the front and rear fixed plates (410) is fixedly connected with a sandblasting tube (409), and the lower surface of the sandblasting tube (409) is provided with a plurality of quartz sand nozzles (411), and 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); The left and right ends of the front side of the guide arm (407) are fixedly connected to a linkage plate (412), and the left and right linkage plates (412) are fixedly connected to a linkage rod (413) on one side away from the guide arm (407). The ends of the two linkage rods (413) away from the corresponding linkage plates (412) are respectively arranged to pass through the interior of two piston tubes (418), and the ends of the linkage rods (413) located inside the piston tube (418) are fixedly connected to the piston head (414); An exhaust pipe (415) is provided on the lower surface of one end of the piston tube (418) away from the linkage plate (412), and one end of the exhaust pipe (415) away from the piston tube (418) is connected to a one-way valve (416), and an air inlet end of the one-way valve (416) is provided inside the negative pressure chamber (8).

2. The lost foam casting device for motor housing casting according to claim 1, characterized in that: The outer side of the piston tube (418) is fixedly connected to a fixing ring (13), the rear side of the fixing ring (13) is fixedly connected to the outer side of the fixing column (501), and the outer end of the piston tube (418) is connected to a one-way exhaust nozzle (417).

3. The lost foam casting device for motor housing casting according to claim 1, characterized in that: The compaction auxiliary mechanism (5) comprises 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 guide pad (506), wherein the upper top plate (502) is arranged above the outer bracket (7), and the outer bracket (7) is fixedly connected to the outside of the casting pool (1), and the four corners of the lower surface of the upper top plate (502) are fixedly connected to fixed columns (501), and the lower end of each fixed column (501) is fixedly connected to the upper surface of the outer bracket (7).

4. The lost foam casting device for motor housing casting according to claim 3, characterized in that: A hydraulic rod (503) is provided on the upper surface of the outer bracket (7), the fixed end of the hydraulic rod (503) is fixedly connected to the outer bracket (7), the free end of the hydraulic rod (503) is transmission-connected to an extension plate (504), the lower end of the extension plate (504) is fixedly connected to the upper surface of a compacting plate (505), and the lower surface of one end of the compacting plate (505) away from the extension plate (504) is fixedly connected to a wedge-shaped guide pad (506), the lower surface of the wedge-shaped guide pad (506) being an inclined surface.

5. The lost foam casting device for motor housing casting according to claim 1, characterized in that: Partitions (9) are fixedly connected to both left and right sides of the casting pool (1), a negative pressure cavity (8) is provided between the partition (9) and the casting pool (1), and a plurality of air holes (10) are provided on the surface of the partition (9).

6. The lost foam casting device for motor housing casting according to claim 1, characterized in that: The rear side of the casting pool (1) is fixedly connected to a fixed bracket (2), the upper surface of the fixed bracket (2) is fixedly connected to a sand box barrel (3), the upper surface of the sand box barrel (3) is provided with a sand guide pump (11), the sand inlet end of the sand guide pump (11) is provided inside the sand box barrel (3), the sand outlet end of the sand guide pump (11) is connected to a sand guide pipe (12), and the end of the sand guide pipe (12) away from the sand outlet end of the sand guide pump (11) is connected to the sand blasting pipe (409).

7. The lost foam casting device for motor housing casting according to claim 1, characterized in that: A motor housing foam mold (6) is provided 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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