A molding sand coating device for molding sand used in sand casting

Abstract

The application discloses a sand casting coating equipment for sand mould casting, and relates to the technical field of sand mould casting. The sand casting coating equipment comprises a pre-compaction assembly arranged in the interior of a first dispersion cylinder. The pre-compaction assembly comprises a first cover body, a first sealing gasket and a second cover body. The first cover body is arranged on the top of the second cover body. The sand material is blocked and folded by the inner walls of the two cover bodies, so that the sand material is preliminarily compacted. The pre-compaction assembly further comprises two fan-shaped plates and a plurality of contact strips. The coarse and fine particles in the sand material are fully mixed in dynamic tumbling. Two layers of cylinder bodies are arranged in a manner that the opening directions of the two layers of cylinder bodies are opposite and the two layers of cylinder bodies rotate synchronously. The intermittent discharging holes in the bottom surface of the upper layer of cylinder bodies and the receiving and compacting structure of the lower layer of cylinder bodies are matched. The sand material sequentially experiences gravity impact compaction and centrifugal extrusion in the conveying process, so that the air between the sand particles is discharged, the bulk density is improved, and the sand material surface is uniformly humidified in a flexible contact and capillary transfer mode by the water-absorbing cotton strips.

Description

Technical Field

[0001] This invention relates to the field of sand casting technology, specifically to a casting coating equipment for molding sand in sand casting. Background Technology

[0002] Sand casting begins by melting recycled scrap steel and scrap iron metal at high temperatures to obtain molten metal that meets the required composition. The molten metal is then poured into a mold cavity prepared with molding sand for sand casting. After cooling and solidification, a blank casting with the same shape as the mold is obtained. The blank casting is usually not usable directly and must undergo subsequent machining processes such as turning, milling, and drilling to achieve the dimensional accuracy, geometric tolerances, and surface quality requirements specified for the final product.

[0003] Currently, in the sand casting process, the performance of casting coating equipment for molding sand is closely related to the pretreatment quality of the sand. Existing coating equipment often focuses on the application method and coating control of the coating itself, while paying insufficient attention to the state of the sand before entering the coating process. Open hoppers are often used to transport sand, which remains loose during transportation, with high air content and low bulk density between sand particles. When entering the sand mixing coating process, the sand mold with insufficient compaction is prone to losing sand due to the scouring effect of molten metal during pouring. Furthermore, the sand has already stratified due to gravity when it enters the molding sand cavity, with coarse sand particles settling at the bottom and fine sand particles floating on the surface, resulting in uneven particle size distribution within the same batch of sand. At the same time, the surface of the old sand is hydrophobic due to the adhering dust and deactivated clay particles. Traditional spraying methods have obvious defects when adding water to the sand: the water droplets generated by spraying shrink into spherical shapes due to their own surface tension and cannot wet the surface of the sand particles. Summary of the Invention

[0004] The purpose of this invention is to provide a casting coating equipment for molding sand in sand casting, so as to solve the problems mentioned in the background art, where sand molds with insufficient compactness are prone to sand loss due to molten metal erosion during casting, and the sand material has already delaminated due to gravity when it enters the molding sand cavity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a casting coating equipment for molding sand in sand casting, comprising a first dispersion cylinder;

[0006] The second dispersion cylinder is located at the bottom of the first dispersion cylinder, and the two work together to achieve intermittent feeding and compaction of sand.

[0007] The pre-compaction component is located inside the first dispersion cylinder. The pre-compaction component includes a first cover, a first sealing gasket, and a second cover. The first cover is located on top of the second cover, and the opening directions of the two are opposite. The sand is initially compacted by the obstruction and constriction formed by the inner walls of the two covers on the sand.

[0008] The pre-compaction component also includes two sector plates and several contact strips. The contact strips are respectively disposed on the surface of the two sector plates and rotate in the inner cavity of the second dispersion cylinder to fully mix the coarse and fine particles in the sand during dynamic tumbling.

[0009] The humidification and tension reduction component is located on both sides of the first dispersion cylinder. The humidification and tension reduction component includes several cotton strips that can be moistened by water to humidify the sand and reduce the surface tension of the sand, so that the coating can be spread evenly.

[0010] Preferably, the top of the first dispersing cylinder is provided with a feeding pipe for conveying sand, and the bottom surface of the second dispersing cylinder is provided with multiple feeding ports.

[0011] Preferably, the pre-compacting component further includes a servo motor, which is disposed on the back of the first dispersing cylinder. A first rod is disposed on one side of the first dispersing cylinder, and a second rod is disposed on one side of the first dispersing cylinder. A pulley is sleeved on one end of both the first rod and the second rod, and the two pulleys are connected by belt drive.

[0012] Preferably, the first cover is fitted onto one end of the first rod, the second cover is fitted onto one end of the second rod, a second sealing gasket is provided on the outside of the second cover, and a pusher plate is provided on one side of the second sealing gasket for pushing the sand material accumulated in the inner cavity of the second dispersion cylinder.

[0013] Preferably, the output shaft of the servo motor is connected to one end of the second rod, and the first sealing gasket is sleeved on the outer surface of the first cover. During the rotation of the first sealing gasket, it is in close contact with the inner surface of the first dispersion cylinder.

[0014] Preferably, the outer surface of the second rod is provided with a plurality of extension strips, the two fan-shaped plates are respectively disposed between two adjacent extension strips, and the plurality of contact strips are disposed at equal intervals.

[0015] Preferably, the humidification and tension reduction assembly further includes two supply plates, which are respectively disposed on both sides of the first dispersion cylinder, and each of the two supply plates is provided with a supply box on one side.

[0016] Preferably, both supply boxes are provided with multiple limiting mechanisms on their exteriors for disassembling the first dispersing cylinder and the humidifying and tension-reducing assembly, and multiple cotton strips are respectively arranged inside the two supply plates.

[0017] Preferably, each of the two supply plates is provided with a cover frame on one side, and each of the two cover frames is provided with a filter cloth to prevent sand particles from adhering to the surface of the cotton strip.

[0018] Preferably, all of the contact strips rotate synchronously inside the second cover, and the opening diameter of the first sealing gasket is larger than the opening diameter of the first cover.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In this invention, by setting up two cylinders with opposite opening directions and rotating synchronously, and coordinating the intermittent feeding holes on the bottom surface of the upper cylinder with the receiving and compaction structure of the lower cylinder, the sand material undergoes gravity impact compaction and centrifugal extrusion during the conveying process, expelling air between sand particles, increasing the bulk density, and solving the problem of sand loss during casting caused by insufficient compaction of loose sand material. At the same time, the fan-shaped plates and contact strips symmetrically arranged in the lower cylinder rotate with the second cover to repeatedly scatter, shear, and forcibly mix the sand material, so that coarse and fine particles are fully mixed in dynamic tumbling, solving the problem of uneven particle size caused by gravity stratification, and making the sand material entering the molding sand cavity uniform in composition. In addition, the humidification and tension reduction components set on both sides of the equipment use absorbent cotton strips to uniformly humidify the surface of the sand material through flexible contact and capillary transfer, avoiding the defects of traditional spraying methods that impact and damage the sand material structure. The surface of the sand particles changes from hydrophobic to hydrophilic, improving the wetting and spreading performance and adhesion strength of subsequent coatings on the sand mold surface. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a casting coating equipment for molding sand in sand casting according to the present invention;

[0022] Figure 2 This invention relates to a casting coating equipment for molding sand in sand casting. Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a rear view structural schematic diagram of a casting coating equipment for molding sand in the present invention;

[0024] Figure 4 This is a schematic diagram of the pre-compaction component in a casting coating equipment for molding sand in sand casting according to the present invention;

[0025] Figure 5 This is a schematic diagram of the secondary compaction component in a casting coating equipment for molding sand in the present invention.

[0026] Figure 6 This is a frontal cross-sectional structural diagram of a casting coating equipment for molding sand in the present invention.

[0027] Figure 7 This is a partial exploded view of a casting coating equipment for molding sand in the present invention.

[0028] In the diagram: 100, First dispersing cylinder; 111, Feeding pipe; 112, Second dispersing cylinder; 113, Feeding port; 200, Pre-compacting assembly; 201, Servo motor; 202, First rod; 203, Pulley; 204, Belt; 205, First cover; 206, First sealing gasket; 207, Second rod; 208, Second cover; 209, Second sealing gasket; 210, Push plate; 211, Extension strip; 212, Fan-shaped plate; 213, Contact strip; 300, Humidification and tension reduction assembly; 301, Supply plate; 302, Supply box; 303, Limiting mechanism; 304, Cotton strip; 305, Cover frame; 306, Filter cloth. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This invention provides a casting coating equipment for molding sand in sand casting, with reference to... Figure 1 as well as Figure 3 As shown: It includes: a first dispersion cylinder 100, a feeding pipe 111 is provided on the top of the first dispersion cylinder 100, and the two are welded together. The feeding pipe 111 is used to transport sand. The first dispersion cylinder 100 is connected to the coating equipment through a limiting structure. The sand is mainly transported into the molding sand cavity through the first dispersion cylinder 100 for subsequent coating. The bottom surface of the second dispersion cylinder 112 is provided with multiple feeding ports 113, and the lower part of the feeding ports 113 is directly opposite the open area of ​​the molding sand cavity.

[0031] In existing sand casting equipment for molding sand, the sand mold with insufficient compaction is prone to sand loss due to molten metal erosion during pouring. Furthermore, the sand material has already separated into layers due to gravity when it enters the molding sand cavity. In this invention, a pre-compacting component 200 and a humidifying and tension-reducing component 300 are set to gently add a specified amount of water to the sand material during the compaction process.

[0032] like Figure 2 as well as Figure 4As shown, the second dispersion cylinder 112 is located at the bottom of the first dispersion cylinder 100, and the two are welded together. The second dispersion cylinder 112 is located at the bottom of the first dispersion cylinder 100 and is divided into two cavities for intermittent feeding of sand. The two work together to achieve intermittent feeding and compaction of sand. The pre-compacting component 200 is located inside the first dispersion cylinder 100. The pre-compacting component 200 includes a first cover 205, a first sealing gasket 206, and a second cover 208. The first sealing gasket 206 mainly serves as a transition channel. During rotation, the first sealing gasket 206 will make close contact with the inner surface of the first dispersion cylinder 100, thus preventing sand from entering the inner cavity of the first dispersion cylinder 100. The first cover 205 is located on top of the second cover 208, and the openings of the two are opposite and synchronous. The rotation of the sand material, through the obstruction and gathering of the inner walls of both covers, achieves initial compaction of the sand material. During the rotation of the first sealing gasket 206, it will connect with the end of the feeding pipe 111, so that the sand material can fall smoothly into the interior of the first cover 205. As the first cover 205 continues to rotate, the opening of the first cover 205 faces downward, and the sand material will fall downward under the action of gravity. At this time, the opening of the second cover 208 is facing upward, and the sand material will enter the interior of the second cover 208. The impact process applies impact compaction to the sand material. The loose sand particles rearrange themselves at the moment of impact, expelling the air between the particles, increasing the packing density between the sand particles, and making the sand particles more compact. The first cover 205 serves as the first receiving surface, and the second cover 208 serves as the second receiving surface, forming obstruction and gathering of the falling sand material. Together, they complete the initial compaction.

[0033] like Figure 4As shown, the pre-compacting component 200 also includes two sector plates 212 and several contact strips 213. The contact strips 213 are respectively disposed on the surfaces of the two sector plates 212, which are welded together and rotate inside the second dispersion cylinder 112. This allows for thorough mixing of coarse and fine particles in the sand through dynamic tumbling. The contact strips 213 rotate synchronously inside the second cover 208. The opening diameter of the first sealing gasket 206 is larger than the opening diameter of the first cover 205. The opening of the first cover 205 faces upward to receive material from the feeding pipe 111, while the opening of the second cover 208 faces downward to discharge material through the lower outlet. The two components work together to form a flow direction from receiving material at the top to discharging material at the bottom. The kinetic energy gained by the sand when it falls from the feeding pipe 111... When impacting the inner walls of the first cover 205 and the second cover 208, the energy is converted into compaction energy. At the same time, when the second cover 208 rotates, the centrifugal extrusion and pushing of the inner wall on the sand further compresses the sand, expelling the air between the sand particles and achieving preliminary compaction. The fan-shaped plates 212 are symmetrically distributed inside the second cover 208. As the second cover 208 rotates, the fan-shaped plates 212 rotate with the second cover 208, and their working surfaces continuously scoop up, lift and scatter the sand inside the second cover 208, causing the sand to form a dynamic tumbling motion inside the second cover 208. The sand generates relative motion during the tumbling operation. The coarse sand particles have greater inertia and are thrown farther, while the fine sand particles have less inertia and fall closer, so that the coarse and fine particles are forcibly mixed in the repeated throwing.

[0034] It should be noted that the contact strip 213, including the components set in the pre-compacting assembly 200, are all made of wear-resistant alloy steel to resist the wear of the abrasive.

[0035] like Figure 5As shown, the humidification and tension reduction assembly 300 is disposed on both sides of the first dispersion cylinder 100, and the two are detachably connected. A rubber sealing gasket is provided between the humidification and tension reduction assembly 300 and the first dispersion cylinder 100 to prevent sand dust from overflowing from the connection gap. The humidification and tension reduction assembly 300 includes several cotton strips 304, which are kept moist inside the humidification and tension reduction assembly 300. The cotton strips 304 can be moistened by water, humidifying the sand, reducing the surface tension of the sand, and making the coating spread evenly. When the sand is transported from the upper first cover 205 to the lower second cover 208 into the molding sand cavity, the sand is humidified by the humidification of the humidification and tension reduction assembly 300 under the action of gravity. As the area passes through, the moistened cotton strips 304 on both sides come into contact with the surface of the sand. During the movement, the sand particles rub against and roll over the surface of the cotton strips 304. The water adsorbed in the capillaries of the cotton strips 304 is transferred to the surface of the sand particles through capillary transfer, forming a water film on the surface of the sand particles. The cotton strips 304 flexibly contact the sand particles without causing them to break. The humidification and tension reduction component 300 has a groove inside that matches the cross-sectional shape of the cotton strips 304. The cotton strips 304 are directly embedded in the grooves and fixed by the clamping force of the grooves. This method facilitates quick replacement. The water film changes the surface of the sand particles from hydrophobic to hydrophilic, reducing the interfacial tension between the sand particles and the water-based coating, allowing the subsequent coating droplets to spread automatically.

[0036] It should be noted that the tampons 304 have a drainage tube on the side, allowing external water to continuously seep into the tampons 304, keeping them saturated and moist. The tampons 304 are moistened to a specified value. The surface of old sand usually has fine dust and deactivated clay particles attached to it, and the surface is hydrophobic. The tampons 304 are made of absorbent material.

[0037] like Figure 6As shown, the pre-compacting component 200 also includes a servo motor 201, which is located on the back of the first dispersing cylinder 100 and welded together. The servo motor 201 serves as a power source, with its output shaft extending towards the interior of the first dispersing cylinder 100. It is connected to the subsequent second rod 207 via a coupling. A first rod 202 is located on one side of the first dispersing cylinder 100, and the two are movably interlocked. A second rod 207 is also located on one side of the first dispersing cylinder 100, and the two are movably interlocked. A pulley 203 is fitted at one end of both the first rod 202 and the second rod 207 for power transmission. The rotation of the second rod 207 drives the pulley 203 at its end to rotate synchronously. Each pulley 203 is connected by a belt 204. Rotation of one pulley 203 drives the other pulley 203 to rotate. A first cover 205 is fitted onto one end of a first rod 202, and the two are welded together. Rotation of the first rod 202 drives the first cover 205 to rotate, which in turn rotates circumferentially within the inner cavity of the first dispersing cylinder 100. A second cover 208 is fitted onto one end of a second rod 207, and the two are welded together. Rotation of the second rod 207 drives the second cover 208 to rotate, which in turn rotates circumferentially within the inner cavity of the second dispersing cylinder 112. A second sealing gasket 209 is welded to the outside of the second cover 208. A pusher plate 210 is provided on one side of the sealing gasket 209, and the two are welded together. It is used to push the sand material accumulated in the inner cavity of the second dispersion cylinder 112. After the servo motor 201 is started, it first drives the second rod 207, which is connected to its output shaft, to rotate. This drives the pulley 203, which is fixedly sleeved with it, to rotate. Under the connection of the belt 204, another pulley 203 drives the first rod 202 to rotate. The second cover 208 and the first cover 205 rotate in the inner cavities of the second dispersion cylinder 112 and the first dispersion cylinder 100, respectively. When the opening of the second cover 208 faces upward, the opening of the first cover 205 faces downward. The first cover 205 and the second cover 208 rotate in opposite directions, applying pressure to the sand material inside. The opposing shear forces ensure thorough mixing and kneading of the sand. After falling from the feeding pipe 111 into the first enclosure 205, the sand continuously tumbles as the first enclosure 205 rotates. When the first enclosure 205 rotates to a downward position, the sand leaks out through the holes and falls into the second enclosure 208 below. It is then discharged outwards through multiple feeding ports 113. The continuous rotation of the first enclosure 205 causes sand at different positions to alternately face downwards, achieving uniform and intermittent release of the sand. The second enclosure 208 is a hollow cavity designed to receive the sand falling from the first enclosure 205 and further agitate, mix, compact, and transport it. Fan-shaped plates 212 inside the second enclosure 208 continuously scoop and disperse the sand, achieving thorough mixing of coarse and fine particles.Contact strip 213 shears the sand, breaks up clumps, and scrapes away sand adhering to the walls.

[0038] like Figure 4 as well as Figure 7 As shown, the output shaft of the servo motor 201 is connected to one end of the second rod 207. The first sealing gasket 206 is sleeved on the outer surface of the first cover 205. During rotation, the first sealing gasket 206 is tightly attached to the inner surface of the first dispersing cylinder 100. The outer surface of the second rod 207 is provided with multiple extension strips 211, which are welded together. The extension strips 211 are used to support the fan-shaped plates 212. Two fan-shaped plates 212 are respectively set between two adjacent extension strips 211, which are welded together. As the extension strips 211 rotate, they drive the fan-shaped plates 212 to rotate synchronously. Several contact strips 213 are arranged at equal intervals. When the second rod 207 rotates... The extension bar 211, the fan-shaped plate 212, and the contact bar 213 rotate synchronously. During the rotation, the contact bar 213 scoops up the sand at the bottom of the second cover 208 and throws it upwards onto the cylinder. The sand scatters in the air and falls back down, achieving repeated tumbling. During the rotation of the fan-shaped plate 212, the contact bar 213 continuously shears the sand, breaking up the clumps of sand. During the rotation, the extension bar 211 generates auxiliary disturbance to the sand and simultaneously limits the axial movement of the fan-shaped plate 212. Under the repeated scattering of the second cover 208 and the shearing action of the contact bar 213, the sand has a uniform particle size distribution. Subsequently, under the axial thrust of the second cover 208 and the pusher plate 210, it is pushed towards the feeding port 113.

[0039] like Figure 5As shown, the humidification and tension reduction assembly 300 also includes two supply plates 301, which are respectively disposed on both sides of the first dispersion cylinder 100. Each of the two supply plates 301 has a supply box 302 on one side. The supply box 302 is welded to the supply plate 301 and moves with it, serving as a transitional connection between the supply plate 301 and the limiting mechanism 303. Multiple limiting mechanisms 303 are provided on the exterior of each of the two supply boxes 302. Each limiting mechanism 303 includes bolts, which are threadedly connected to the first dispersion cylinder 100 to facilitate the disassembly and replacement of the first dispersion cylinder 100 and the humidification and tension reduction assembly 300. The disassembly between the 0 and the humidification and tension reduction component 300 involves multiple cotton strips 304 respectively installed inside the two supply plates 301, which are interlocked. Each of the two supply plates 301 has a cover frame 305 on one side, and each cover frame 305 has a filter cloth 306 inside to prevent sand particles from adhering to the surface of the cotton strips 304. During normal operation, the limiting mechanism 303 is in a locked state, firmly fixing the supply plates 301 to both sides of the first dispersion cylinder 100. Multiple cotton strips 304 are installed in the internal cavities of the two supply plates 301, meaning that several cotton strips 304 are installed in each of the left and right supply plates 301, and the connection between them is via a slot. The supply plate 301 is fixed in a fixed manner, which can fix the cotton strips 304 without squeezing them and affecting their water absorption performance. The cotton strips 304 are mainly made of wood pulp cotton, which can absorb and retain moisture. The arrangement of multiple layers of cotton strips 304 allows the sand to be humidified step by step as it passes through. The water supply system continuously supplies water to each layer of cotton strips 304 to keep them moist. The cover frame 305 is used to support the filter cloth 306, which is located on one side of the multiple cotton strips 304. The mesh size of the filter cloth 306 is smaller than the particle size of the sand, so the sand particles cannot penetrate the filter cloth 306 and come into contact with the cotton strips 304, while allowing air and water vapor to pass through. The cover frame 305 acts as a protective barrier for the cotton strips 304 and is set on the side of the cotton strips 304 facing the sand. On one side of the channel, the sand is blocked from direct impact and friction on the cotton strip 304. During the fall of the sand, it first comes into contact with the filter cloth 306 on the cover frame 305, rather than directly contacting the cotton strip 304. Large particles and clumps in the sand are blocked and slide off by the outer surface of the filter cloth 306. The moisture on the surface of the cotton strip 304 will permeate into the sand through the filter cloth 306, keeping the cotton strip 304 clean. The cotton strip 304 is a flexible contact with no impact force, does not change the particle size distribution and stacking state of the sand, and does not damage the structure of the sand. The cotton strip 304 only adsorbs free moisture and dust on the surface of the sand and does not produce clumps. The capillary moisture forms a water film on the surface of the sand particles, which provides adhesion for the subsequent coating.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A casting coating equipment for molding sand in sand casting, comprising: The first dispersion cylinder (100) is characterized in that; The second dispersion cylinder (112) is located at the bottom of the first dispersion cylinder (100), and the two work together to achieve intermittent feeding and compaction of sand. The pre-compaction component (200) is disposed inside the first dispersion cylinder (100). The pre-compaction component (200) includes a first cover (205), a first sealing gasket (206), and a second cover (208). The first cover (205) is located on top of the second cover (208). The opening directions of the two are opposite. The sand is initially compacted by blocking and converging the sand through the inner walls of the two. The pre-compacting component (200) also includes two fan-shaped plates (212) and several contact strips (213). The several contact strips (213) are respectively disposed on the surface of the two fan-shaped plates (212) and rotate in the inner cavity of the second dispersion cylinder (112) to fully mix the coarse and fine particles in the sand in dynamic tumbling. The humidification and tension reduction component (300) is disposed on both sides of the first dispersion cylinder (100). The humidification and tension reduction component (300) includes several cotton strips (304). The cotton strips (304) can be moistened by water, humidify the sand, reduce the surface tension of the sand, and make the coating spread evenly.

2. The casting coating equipment for molding sand in sand casting according to claim 1, characterized in that: The first dispersion cylinder (100) is provided with a feeding pipe (111) at the top for conveying sand, and the second dispersion cylinder (112) is provided with multiple feeding ports (113) on the bottom surface.

3. The casting coating equipment for molding sand in sand casting according to claim 2, characterized in that: The pre-compacting component (200) also includes a servo motor (201), which is located on the back of the first dispersing cylinder (100). A first rod (202) is provided on one side of the first dispersing cylinder (100), and a second rod (207) is provided on one side of the first dispersing cylinder (100). A pulley (203) is fitted at one end of both the first rod (202) and the second rod (207), and the two pulleys (203) are connected by a belt (204).

4. The casting coating equipment for molding sand in sand casting according to claim 3, characterized in that: The first cover (205) is sleeved on one end of the first rod (202), and the second cover (208) is sleeved on one end of the second rod (207). A second sealing gasket (209) is provided on the outside of the second cover (208), and a pusher plate (210) is provided on one side of the second sealing gasket (209) for pushing the sand material accumulated in the inner cavity of the second dispersion cylinder (112).

5. The casting coating equipment for molding sand in sand casting according to claim 3, characterized in that: The output shaft of the servo motor (201) is connected to one end of the second rod (207) for transmission. The first sealing gasket (206) is sleeved on the outer surface of the first cover (205). During the rotation of the first sealing gasket (206), it is tightly attached to the inner surface of the first dispersion cylinder (100).

6. The casting coating equipment for molding sand in sand casting according to claim 3, characterized in that: The outer surface of the second rod (207) is provided with a plurality of extension strips (211), and the two fan-shaped plates (212) are respectively arranged between two adjacent extension strips (211). The positions of the plurality of contact strips (213) are all arranged at equal intervals.

7. The casting coating equipment for molding sand in sand casting according to claim 1, characterized in that: The humidification and tension reduction assembly (300) also includes two supply plates (301), which are respectively disposed on both sides of the first dispersion cylinder (100), and each of the two supply plates (301) is provided with a supply box (302) on one side.

8. The casting coating equipment for molding sand in sand casting according to claim 7, characterized in that: Both supply boxes (302) are provided with multiple limiting mechanisms (303) on the outside for disassembling the first dispersion cylinder (100) and the humidification and tension reduction assembly (300), and multiple cotton strips (304) are respectively arranged inside the two supply plates (301).

9. The casting coating equipment for molding sand in sand casting according to claim 7, characterized in that: Each of the two supply plates (301) is provided with a cover frame (305) on one side, and each of the two cover frames (305) is provided with a filter cloth (306) to prevent sand particles from adhering to the surface of the cotton strip (304).

10. The casting coating equipment for molding sand in sand casting according to claim 1, characterized in that: Several of the contact strips (213) rotate synchronously inside the second cover (208), and the opening diameter of the first sealing gasket (206) is larger than the opening diameter of the first cover (205).

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