A coated sand feeding system

Abstract

The present invention relates to the technical field of coated sand, and discloses a coated sand feeding system, comprising an installation unit, a transmission unit, a breaking up unit, and a dispersion unit. The installation unit comprises a loading hopper, and a discharge port is provided at the bottom of the loading hopper; the breaking up unit comprises an annular screening plate, and the annular screening plate is used to break up the coated sand; the dispersion unit comprises a circular mounting plate, and a plurality of arc-shaped fixing plates arranged in a circular distribution are provided above the circular mounting plate. In the present invention, firstly, a staff member can drive a stirring rod to rotate through a driving assembly, so that the stirring rod can stir the poured coated sand, which ensures to a certain extent that the coated sand will not clump. At the same time, the driving assembly can also drive the annular screening plate to move back and forth vertically while rotating, thereby ensuring that when the coated sand falls onto the annular screening plate, it can be broken up, thereby further ensuring that the coated sand will not clump.

Description

Technical Field

[0001] The invention belongs to the technical field of coated sand, and in particular relates to a coated sand feeding system. Background Art

[0002] Coated sand refers to molding sand or core sand that is coated with a layer of solid resin film on the surface of the sand grains before molding. There are two coating processes: cold method and hot method. The cold method is to dissolve the resin with ethanol and add urotropine during the sand mixing process so that the two are coated on the surface of the sand grains. The ethanol evaporates to obtain coated sand; the hot method is to preheat the sand to a certain temperature, add resin to dissolve it, stir it to coat the resin on the surface of the sand grains, add urotropine aqueous solution and lubricant, cool, crush and sieve to obtain coated sand.

[0003] However, when the existing coated sand is loaded, the coated sand is often poured into the loading hopper for loading. However, the coated sand is often prone to agglomeration during the loading process, which causes the loading port of the loading hopper to be easily blocked.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A coated sand feeding system includes an installation unit, a transmission unit, a breaking up unit, and a dispersion unit. The installation unit includes a feed hopper with a discharge port at the bottom. The transmission unit, the breaking up unit, and the dispersion unit are all arranged in the feed hopper. The breaking up unit includes an annular screening plate and an external circular cylinder. The annular screening plate is sleeved on the external circular cylinder and is used to break up the coated sand.

[0007] The dispersion unit includes a circular mounting plate, and a plurality of arc-shaped fixing plates are arranged above the circular mounting plate in a circumferential distribution;

[0008] The transmission unit includes a driving assembly, which is used to stir the coated sand in the upper hopper, drive the annular screening plate to move up and down and rotate, and drive the circular mounting plate to rotate; the driving assembly drives the annular screening plate to move vertically and reciprocatingly while rotating, ensuring that the coated sand is broken up when it falls onto the annular screening plate, and the coated sand after being screened by the annular screening plate falls onto the circular mounting plate, and is rotated by the circular mounting plate to rotate the coated sand along the arc trajectory of the arc fixing plate, thereby ensuring that the discharge port avoids blockage when feeding the coated sand.

[0009] As a preferred embodiment of the present invention, mounting brackets are provided around the upper hopper, an upper annular plate is rotatably provided on the inner cavity of the upper hopper, an upper feed port is provided on the upper annular plate, a lower annular plate is provided at the bottom of the upper annular plate, a lower feed port is provided on the lower annular plate, the upper feed port and the lower feed port fit together, and the upper feed port and the lower feed port correspond to each other in an staggered manner, a circular protective shell is provided in the inner cavity of the upper hopper, four mounting brackets distributed in a circular manner are provided around the outer wall of the circular protective shell, and opposite ends of the four mounting brackets are respectively provided on the inner wall of the upper hopper, and a slot is provided above the circular protective shell.

[0010] As a preferred embodiment of the present invention, positioning rods are provided around the inner cavity of the discharge port, and supporting legs are provided on one side wall opposite to the four positioning rods, and a circular mounting plate is provided above the supporting legs.

[0011] As a preferred embodiment of the present invention, the drive assembly includes a servo motor, which is arranged on a circular mounting plate. A rotating rod is fixedly installed at the output end of the servo motor. The rotating rod movably passes through the circular protective shell and the upper annular plate, and the rotating rod is fixed through the lower annular plate. The end of the rotating rod away from the servo motor is fixedly connected to a fixed block, and stirring rods are provided on all four sides of the fixed block.

[0012] As a preferred embodiment of the present invention, the rotating rod is provided with two mutually symmetrical connecting rods in the inner cavity of the circular protective shell, and the opposite ends of the two connecting rods are fixedly connected to the inner circular cylinder, and an external circular cylinder is provided on the outer side of the inner circular cylinder. Two mutually symmetrical rectangular notches are opened on the side of the external circular cylinder, and limiting rods are provided on the outer wall of the inner circular cylinder and the inner wall of the external circular cylinder.

[0013] As a preferred embodiment of the present invention, a guide groove is provided on the outer side wall of the built-in circular cylinder, a guide slider is slidably provided on the guide groove, a guide sleeve is fixedly connected to the guide slider, the guide sleeve is sleeved on the built-in circular cylinder, and two mutually symmetrical guide rods are fixedly connected to the guide sleeve, and the upper ends of the two guide rods are fixedly connected above the inner cavity of the circular protective shell.

[0014] As a preferred embodiment of the present invention, a circular groove is provided on the outer wall of the guide sleeve, and two movable sliders are slidingly provided in the inner cavity of the circular groove. The two movable sliders are symmetrical to each other, and the opposite ends of the two movable sliders are fixedly connected with connecting blocks, and the two connecting blocks are respectively sealed and slidably provided in the rectangular groove.

[0015] As a preferred embodiment of the present invention, an upper multi-stage telescopic plate is respectively arranged above the two connecting blocks, and one end of the two upper multi-stage telescopic plates away from the connecting blocks is fixedly connected to the top of the inner cavity of the rectangular slot, and a lower multi-stage telescopic plate is provided at the bottom of the two connecting blocks, and one end of the two lower multi-stage telescopic plates away from the connecting blocks is fixedly connected to the bottom of the inner cavity of the rectangular slot, the two upper multi-stage telescopic plates and the two lower multi-stage telescopic plates are respectively sealed and arranged on the rectangular slot, and the opposite sides of the two connecting blocks are installed on the annular screening plate.

[0016] As a preferred embodiment of the present invention, the bottoms of the two limit rods are fixedly connected to fixing rods, the two fixing rods are symmetrical to each other, and one end of the two fixing rods away from the limit rods is connected to a circular mounting plate.

[0017] As a preferred embodiment of the present invention, a plurality of sieve holes distributed in a circumferential manner are provided at the bottom of the inner cavity of the circular protective shell. A protective cylinder is also provided at the bottom of the circular protective shell, and the bottom of the protective cylinder is rotatably arranged on a circular mounting plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] According to the present invention, firstly, the staff can drive the stirring rod to rotate through the driving assembly, so that the stirring rod can stir the poured coated sand, which ensures that the coated sand will not clump to a certain extent. At the same time, the driving assembly can also drive the annular screening plate to move vertically back and forth while rotating, thereby ensuring that when the coated sand falls onto the annular screening plate, it can be broken up, thereby further ensuring that the coated sand will not clump, and the rotation of the circular ring mounting plate can also drive the arc fixing plate to rotate, thereby ensuring that the coated sand falling onto the circular ring mounting plate can be dispersed to the surroundings of the discharge port through the arc trajectory of the arc fixing plate, thereby ensuring that the discharge port will not be blocked to a certain extent when feeding the coated sand.

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the attached figure:

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of a coated sand feeding system;

[0023] Figure 2 It is a side view structural diagram of a coated sand feeding system;

[0024] Figure 3 This is a schematic diagram of the structure of a coated sand feeding system from an upward perspective;

[0025] Figure 4 It is a partial cross-sectional structural schematic diagram of a coated sand feeding system;

[0026] Figure 5 This is a schematic diagram of the upper annular plate structure of a coated sand feeding system;

[0027] Figure 6 This is a schematic diagram of the explosion structure of the upper and lower annular plates of a coated sand feeding system;

[0028] Figure 7 This is a schematic diagram of the exploded structure of the upper and lower annular plates of a coated sand feeding system from a bottom view;

[0029] Figure 8 This is a schematic diagram of the cross-sectional structure of a circular protective shell of a coated sand feeding system;

[0030] Figure 9 A schematic diagram of the structure of a circular protective shell of a coated sand feeding system (part 1) is shown in cross section.

[0031] Figure 10 A schematic diagram of the structure of a circular protective shell (partial section) of a coated sand feeding system;

[0032] Figure 11 This is a schematic diagram of the cross-sectional structure of an external circular cylinder of a coated sand feeding system;

[0033] Figure 12 This is a schematic diagram of the cross-sectional structure of a built-in circular cylinder of a coated sand feeding system;

[0034] Figure 13 This is a schematic diagram of the inner cavity of a circular protective shell of a coated sand feeding system viewed from above;

[0035] Figure 14 This is a schematic diagram of the limit rod installation structure of a coated sand feeding system.

[0036] In the picture:

[0037] 100, mounting unit; 101, mounting frame; 102, upper hopper; 1021, discharge port; 103, circular mounting plate; 1031, support leg; 1032, positioning rod; 104, mounting bracket;

[0038] 200, transmission unit; 201, servo motor; 2011, rotating rod; 2012, fixing block; 2013, stirring rod; 202, upper annular plate; 2021, upper feed port; 2022, lower annular plate; 2023, lower feed port;

[0039] 300, breaking unit; 301, circular protective shell; 3011, annular screening plate; 3012, sieve hole; 302, connecting rod; 3021, internal circular cylinder; 3022, guide chute; 3023, guide slider; 3024, guide sleeve; 3025, circular chute; 3026, movable slider; 3027, guide rod; 303, external circular cylinder; 3031, rectangular notch; 3032, connecting block; 3033, upper multi-stage telescopic plate; 3034, lower multi-stage telescopic plate; 3035, limit rod;

[0040] 400, dispersion unit; 401, fixing rod; 402, circular mounting plate; 4021, arc-shaped fixing plate; 4022, protective tube. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0042] Example 1: Figures 1 to 14 As shown, a coated sand feeding system includes an installation unit 100, a transmission unit 200, a breaking unit 300 and a dispersion unit 400. The installation unit 100 includes a hopper 102, and a discharge port 1021 is opened at the bottom of the hopper 102;

[0043] The transmission unit 200, the breaking unit 300 and the dispersion unit 400 are all arranged in the upper hopper;

[0044] The breaking up unit 300 includes an annular screening plate 3011 and an external circular cylinder 303. The annular screening plate 3011 is sleeved on the external circular cylinder 303 and is used to break up the coated sand.

[0045] The dispersion unit 400 includes a circular mounting plate 402 , and a plurality of arc-shaped fixing plates 4021 are arranged on the circular mounting plate 402 in a circumferential distribution;

[0046] The transmission unit 200 includes a driving assembly, which is used to stir the coated sand in the upper hopper 102. The driving assembly is also used to drive the annular screening plate 3011 to move up and down and rotate, and the driving assembly is also used to drive the circular mounting plate 402 to rotate; the driving assembly drives the annular screening plate 3011 to move vertically back and forth while rotating, ensuring that the coated sand is broken up when it falls onto the annular screening plate 3011, and the coated sand screened by the annular screening plate 3011 falls onto the circular mounting plate 402. The circular mounting plate 402 rotates, so that the coated sand is rotated out along the arc trajectory of the arc fixing plate 4021, thereby ensuring that the discharge port 1021 avoids blockage when feeding the coated sand.

[0047] Specifically, first, the staff can drive the stirring rod 2013 to rotate through the driving assembly, so that the stirring rod 2013 can stir the poured coated sand, ensuring to a certain extent that the coated sand will not clump. At the same time, the driving assembly can also drive the annular screening plate 3011 to move vertically back and forth while rotating, thereby ensuring that when the coated sand falls on the annular screening plate 3011, it can be broken up, thereby further ensuring that the coated sand will not clump. The rotation of the circular mounting plate 402 can also drive the arc fixing plate 4021 to rotate, thereby ensuring that the coated sand falling on the circular mounting plate 402 can be dispersed to the surroundings of the discharge port 1021 through the arc trajectory of the arc fixing plate 4021, thereby ensuring that the discharge port 1021 will not be blocked to a certain extent when feeding the coated sand.

[0048] like Figures 1 to 7 As shown, in a specific embodiment, a mounting frame 101 is provided around the upper hopper 102, an upper annular plate 202 is rotatably provided in the inner cavity of the upper hopper 102, an upper feed port 2021 is provided on the upper annular plate 202, a lower annular plate 2022 is provided at the bottom of the upper annular plate 202, a lower feed port 2023 is provided on the lower annular plate 2022, the upper feed port 2021 and the lower feed port 2023 fit together, and the upper feed port 2021 and the lower feed port 2023 correspond to each other in an staggered manner, a circular protective shell 301 is provided in the inner cavity of the upper hopper 102, four mounting brackets 104 distributed in a circle are provided around the outer wall of the circular protective shell 301, and opposite ends of the four mounting brackets 104 are respectively provided on the inner wall of the upper hopper 102, and a slot is provided above the circular protective shell 301. In this arrangement, it is ensured that when the rotating rod 2011 rotates, the lower annular plate 2022 can also be driven to rotate. When the lower annular plate 2022 rotates, the lower feed port 2023 is opened on the top thereof, so the lower feed port 2023 can be rotated. At the same time, because the upper annular plate 202 is arranged above the lower annular plate 2022, and the upper annular plate 202 and the upper hopper 102 are fixedly connected, it is ensured that the upper annular plate 202 is stationary. Therefore, when the lower annular plate 2022 rotates, the lower feed port 2023 can always be connected to the upper feed port 2021 opened above the upper annular plate 202, thereby ensuring that there is always coated sand to be fed in, and it can also be ensured that the coated sand is in a dispersed feeding at this time.

[0049] like Figures 1 to 7As shown, further, positioning rods 1032 are provided around the inner cavity of the discharge port 1021, and a supporting leg 1031 is provided on one side wall opposite to the four positioning rods 1032. A circular mounting plate 103 is provided above the supporting leg 1031. In this arrangement, the driving component is guaranteed to have a supporting force.

[0050] Example 2: Based on Example 1, the difference from this example is that: Figures 1 to 14 The figure shows a coated sand feeding system. The drive assembly includes a servo motor 201 mounted on a circular mounting plate 103. A rotating rod 2011 is fixedly mounted on the output end of the servo motor 201. The rotating rod 2011 movably extends through the circular protective shell 301 and the upper annular plate 202. The rotating rod 2011 is fixedly connected to a fixed block 2012 at the end away from the servo motor 201. Stirring rods 2013 are provided on all four sides of the fixed block 2012. In this configuration, the installation position and components of the drive assembly are determined.

[0051] like Figures 8 to 14 As shown, in a specific embodiment, the rotating rod 2011 is provided with two mutually symmetrical connecting rods 302 within the inner cavity of the circular protective shell 301. The opposite ends of the two connecting rods 302 are fixedly connected to an inner circular cylinder 3021. An outer circular cylinder 303 is provided outside the inner circular cylinder 3021. Two mutually symmetrical rectangular notches 3031 are provided on the side of the outer circular cylinder 303. Limiting rods 3035 are provided on the outer wall of the inner circular cylinder 3021 and the inner wall of the outer circular cylinder 303. This arrangement ensures that the inner circular cylinder 3021 can rotate, while also ensuring that the outer circular cylinder 303 can rotate.

[0052] like Figures 8 to 14As shown, further, a guide groove 3022 is provided on the outer wall of the built-in circular cylinder 3021, and a guide slider 3023 is slidably provided on the guide groove 3022. A guide sleeve 3024 is fixedly connected to the guide slider 3023. The guide sleeve 3024 is sleeved on the built-in circular cylinder 3021. Two mutually symmetrical guide rods 3027 are fixedly connected to the guide sleeve 3024. The upper ends of the two guide rods 3027 are fixedly connected above the inner cavity of the circular protective shell 301. In this arrangement, it is ensured that when the rotating rod 2011 rotates, it can also drive the built-in circular cylinder 3021 to rotate through the connecting rod 302. When the built-in circular cylinder 3021 rotates, a guide groove 3022 is provided on the outer wall, and a guide slider 3023 is slidably provided on the guide groove 3022. At the same time, a guide sleeve 3024 is provided on the guide slider 3023, and two guide rods 3027 are movable through the guide sleeve 3024. Therefore, it is ensured that when the built-in circular cylinder 3021 rotates, it can drive the guide sleeve 3024 to move vertically with the assistance of the guide rod 3027, the guide groove 3022 and the guide slider 3023.

[0053] like Figures 8 to 14As shown, further, a circular groove 3025 is provided on the outer wall of the guide sleeve 3024, and two movable sliders 3026 are slidingly provided in the inner cavity of the circular groove 3025. The two movable sliders 3026 are symmetrical to each other, and the opposite ends of the two movable sliders 3026 are fixedly connected with a connecting block 3032, and the two connecting blocks 3032 are respectively sealed and slidably set in the rectangular groove 3031. An upper multi-stage telescopic plate 3033 is respectively arranged above the two connecting blocks 3032, and one end of the two upper multi-stage telescopic plates 3033 away from the connecting blocks 3032 is fixedly connected to the upper part of the inner cavity of the rectangular slot 3031, and a lower multi-stage telescopic plate 3034 is arranged at the bottom of the two connecting blocks 3032, and one end of the two lower multi-stage telescopic plates 3034 away from the connecting blocks 3032 is fixedly connected to the bottom of the inner cavity of the rectangular slot 3031, the two upper multi-stage telescopic plates 3033 and the two lower multi-stage telescopic plates 3034 are respectively sealed and arranged on the rectangular slot 3031, and the opposite sides of the two connecting blocks 3032 are installed on the annular screening plate 3011. When the cam 3032 is in the upright position, the cam 3032 is in the upright position, and the cam 3032 is in the upright position, so that the cam 3032 can move in the upright position.

[0054] Example 3: Based on Example 2, the difference from this example is that: Figures 8 to 14 As shown, a coated sand feeding system has two fixed rods 3035 with fixed rods 401 fixedly connected at the bottom. The two fixed rods 401 are symmetrical to each other, and the ends of the two fixed rods 401 away from the limit rods 3035 are connected to circular mounting plates 402. In this arrangement, the specific installation position of the circular mounting plates 402 is determined, ensuring that the circular mounting plates 402 can rotate.

[0055] like Figures 8 to 14As shown, in a specific embodiment, the bottom of the circular protective shell 301 is provided with a plurality of sieve holes 3012 distributed in a circular pattern. A protective cylinder 4022 is also provided at the bottom of the circular protective shell 301, the bottom of which is rotatably mounted on the annular mounting plate 402. This arrangement ensures that the coated sand screened by the annular screening plate 3011 falls to the bottom of the circular protective shell 301, thereby being discharged through the sieve holes 3012 provided at the bottom of the circular protective shell 301.

[0056] The implementation principle of the coated sand feeding system of the present invention is as follows:

[0057] First, the staff pours the coated sand into the upper hopper 102, and at the same time controls the servo motor 201 to operate. When the servo motor 201 operates, it can drive the rotating rod 2011 to rotate. When the rotating rod 2011 rotates, it can drive the stirring rod 2013 to rotate, so that the poured coated sand is stirred by the stirring rod 2013, thereby ensuring that the coated sand will not clump to a certain extent.

[0058] At the same time, when the rotating rod 2011 rotates, it can also drive the lower annular plate 2022 to rotate. When the lower annular plate 2022 rotates, the lower feeding port 2023 is enabled to rotate because the lower annular plate 2022 is provided with a lower feeding port 2023. At the same time, because the upper annular plate 2022 is provided with an upper annular plate 202, and the upper annular plate 202 and the upper hopper 102 are fixedly connected, it is ensured that the upper annular plate 202 is stationary. Therefore, when the lower annular plate 2022 rotates, the lower feeding port 2023 can always be connected to the upper feeding port 2021 provided above the upper annular plate 202, thereby ensuring that there is always coated sand to be fed in, and at the same time, it can also ensure that the coated sand is in a dispersed feeding at this time (because the circular protective shell 301 is provided with slots around its periphery, it is ensured that the coated sand can enter the slots through the lower feeding port 2023, thereby being loaded);

[0059] At the same time, when the rotating rod 2011 rotates, it can also drive the internal circular cylinder 3021 to rotate through the connecting rod 302. When the internal circular cylinder 3021 rotates, the outer wall of the internal circular cylinder 3021 is provided with a guide groove 3022, and a guide slider 3023 is slidably provided on the guide groove 3022. At the same time, a guide sleeve 3024 is provided on the guide slider 3023, and two guide rods 3027 are movably passed through the guide sleeve 3024. Therefore, when the internal circular cylinder 3021 rotates, it can drive the guide sleeve 3024 to move vertically with the assistance of the guide rod 3027, the guide groove 3022 and the guide slider 3023. When the guide sleeve 3024 moves vertically, it can drive the movable slider 3026 to move vertically through the circular groove 3025 provided on the side wall.

[0060] When the cam 3031 is in the upright position, the cam 3032 is in the upright position, and the cam 3032 is in the upright position, so that the cam 3032 can move in the upright position.

[0061] When the connecting block 3032 rotates and moves upward, it can drive the annular screening plate 3011 to move vertically upward and rotate at the same time, thereby ensuring that when the coated sand passes through the slot, it can fall onto the annular screening plate 3011. Due to the feature that the annular screening plate 3011 can move vertically and rotate at the same time, the coated sand that falls on the annular screening plate 3011 can be broken up, thereby further ensuring that the coated sand will not clump when being loaded (the coated sand screened by the annular screening plate 3011 can fall to the bottom of the inner cavity of the circular protective shell 301, and then be discharged through the sieve holes 3012 opened at the bottom of the inner cavity of the circular protective shell 301);

[0062] At the same time, when the limiting rod 3035 rotates, it can also drive the fixing rod 401 at the bottom to rotate. When the fixing rod 401 rotates, it can drive the circular mounting plate 402 to rotate. When the circular mounting plate 402 rotates, it can drive the arc-shaped fixing plate 4021 to rotate accordingly. Therefore, it is ensured that the coated sand screened by the annular screening plate 3011 can fall from the sieve hole 3012 opened at the bottom of the circular protective shell 301, and then fall onto the circular mounting plate 402. Then, through the rotation of the circular mounting plate 402, the coated sand can be rotated out along the arc trajectory of the arc-shaped fixing plate 4021, and then loaded from the surrounding inner cavity of the discharge port 1021, thereby further ensuring that the coated sand can be dispersed when loading, and ensuring that the discharge port 1021 will not be blocked.

Claims

1. A coated sand feeding system, comprising an installation unit (100), a transmission unit (200), a breaking up unit (300) and a dispersion unit (400), characterized in that: The installation unit (100) comprises an upper hopper (102), and a discharge port (1021) is provided at the bottom of the upper hopper (102); The transmission unit (200), the breaking unit (300) and the dispersion unit (400) are all arranged in the upper hopper; The inner cavity of the upper hopper (102) is provided with a circular protective shell (301), and the breaking up unit (300) comprises an annular screening plate (3011) and an external circular cylinder (303), wherein the annular screening plate (3011) is sleeved on the external circular cylinder (303), and the annular screening plate (3011) is used to break up the coated sand; The dispersion unit (400) comprises a circular mounting plate (402), and a plurality of arc-shaped fixing plates (4021) are arranged above the circular mounting plate (402) and distributed in a circular pattern. The transmission unit (200) includes a driving assembly, which includes a servo motor (201). A rotating rod (2011) is fixedly mounted on the output end of the servo motor (201). The driving assembly is used to stir the coated sand in the upper hopper (102). The driving assembly is also used to drive the annular screening plate (3011) to move up and down and rotate. The driving assembly is also used to drive the circular mounting plate (402) to rotate. The driving assembly drives the annular screening plate (3011) to move back and forth vertically and rotates at the same time, ensuring that the coated sand is broken up when it falls on the annular screening plate (3011). The coated sand screened by the annular screening plate (3011) falls onto the circular mounting plate (402). The circular mounting plate (402) rotates, causing the coated sand to be rotated out along the arc trajectory of the arc fixing plate (4021), thereby ensuring that the discharge port (1021) is prevented from being blocked when the coated sand is fed. The rotating rod (211) is provided with two mutually symmetrical connecting rods (302) in the inner cavity of the circular protective shell (301); opposite ends of the two connecting rods (302) are fixedly connected to an inner circular cylinder (3021); an outer circular cylinder (303) is provided on the outer side of the inner circular cylinder (3021); two mutually symmetrical rectangular notches (3031) are provided on the side of the outer circular cylinder (303); and limiting rods (3035) are provided on the outer wall of the inner circular cylinder (3021) and the inner wall of the outer circular cylinder (303); A guide slot (3022) is provided on the outer wall of the built-in circular cylinder (3021), a guide slider (3023) is slidably provided on the guide slot (3022), a guide sleeve (3024) is fixedly connected to the guide slider (3023), the guide sleeve (3024) is sleeved on the built-in circular cylinder (3021), and two mutually symmetrical guide rods (3027) are fixedly connected to the guide sleeve (3024), and the upper ends of the two guide rods (3027) are fixedly connected above the inner cavity of the circular protective shell (301); A circular groove (3025) is provided on the outer wall of the guide sleeve (3024), and two movable sliders (3026) are slidably provided in the inner cavity of the circular groove (3025). The two movable sliders (3026) are symmetrical to each other, and opposite ends of the two movable sliders (3026) are fixedly connected to connecting blocks (3032). The two connecting blocks (3032) are respectively sealed and slidably provided in the rectangular notch (3031), and opposite sides of the two connecting blocks (3032) are mounted on the annular screening plate (3011).

2. A coated sand feeding system according to claim 1, characterized in that: The upper hopper (102) is provided with a mounting frame (101) around it, an upper annular plate (202) is rotatably provided in the inner cavity of the upper hopper (102), an upper feed port (2021) is provided on the upper annular plate (202), a lower annular plate (2022) is provided at the bottom of the upper annular plate (202), a lower feed port (2023) is provided on the lower annular plate (2022), the upper feed port (2021) and the lower feed port (2023) are fitted with each other, and the upper feed port (2021) and the lower feed port (2023) correspond to each other in an alternating manner, four mounting brackets (104) are provided around the outer wall of the circular protective shell (301) in a circumferential distribution, and opposite ends of the four mounting brackets (104) are respectively provided on the inner wall of the upper hopper (102), and a slot is provided above the circular protective shell (301).

3. The coated sand feeding system according to claim 1, characterized in that: Positioning rods (1032) are provided around the inner cavity of the discharge port (1021), and supporting legs (1031) are provided on one side wall opposite to the four positioning rods (1032), and a circular mounting plate (103) is provided above the supporting legs (1031).

4. A coated sand feeding system according to claim 3, characterized in that: The servo motor (201) is arranged on a circular mounting plate (103); the rotating rod (2011) movably passes through the circular protective shell (301) and the upper annular plate (202), and the rotating rod (2011) is fixedly passed through the lower annular plate (2022); one end of the rotating rod (2011) away from the servo motor (201) is fixedly connected to a fixed block (2012), and stirring rods (2013) are arranged on all four sides of the fixed block (2012).

5. The coated sand feeding system according to claim 1, characterized in that: An upper multi-stage telescopic plate (3033) is respectively provided above the two connecting blocks (3032), and one end of the two upper multi-stage telescopic plates (3033) away from the connecting block (3032) is fixedly connected to the upper part of the inner cavity of the rectangular notch (3031). A lower multi-stage telescopic plate (3034) is provided at the bottom of the two connecting blocks (3032), and one end of the two lower multi-stage telescopic plates (3034) away from the connecting block (3032) is fixedly connected to the bottom of the inner cavity of the rectangular notch (3031). The two upper multi-stage telescopic plates (3033) and the two lower multi-stage telescopic plates (3034) are respectively sealed and provided on the rectangular notch (3031).

6. The coated sand feeding system according to claim 1, characterized in that: The bottoms of the two limiting rods (3035) are fixedly connected to a fixing rod (401), the two fixing rods (401) are symmetrical to each other, and one end of the two fixing rods (401) away from the limiting rod (3035) is connected to a circular mounting plate (402).

7. The coated sand feeding system according to claim 2, characterized in that: The bottom of the inner cavity of the circular protective shell (301) is provided with a plurality of sieve holes (3012) distributed in a circumferential manner. The bottom of the circular protective shell (301) is also provided with a protective cylinder (4022), and the bottom of the protective cylinder (4022) is rotatably mounted on the circular mounting plate (402).

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