A wet sand casting mixing device and a sand mixing method thereof

Abstract

This invention discloses a wet sand casting mixing device and method, relating to the technical field of casting sand mixing devices. The wet sand casting mixing device includes a mixing component and a cleaning component. The cleaning component includes a rinsing unit, a lifting unit, and a rinsing direction switching unit. The lifting unit is used to lift the rinsing unit, which moves down into the machine basin to rinse the interior of the basin. The rinsing direction switching unit switches the rinsing direction of the rinsing unit, allowing it to rinse residual sand from the inner wall of the basin and the surfaces of the grinding wheels and scrapers. By incorporating a cleaning component, this invention integrates lifting, direction-switching, and spiral pressurized automatic cleaning functions while ensuring efficient sand mixing capabilities. This achieves thorough cleaning of the inner wall of the basin, as well as the grinding wheels and scrapers, significantly improving the automation level and clean production degree of the casting sand mixing process.

Description

Technical Field

[0001] This invention relates to the technical field of casting sand mixing devices, specifically a wet sand casting sand mixing device and its mixing method. Background Technology

[0002] The sand mixing device in wet sand casting, usually called a sand mixer, is the core of the entire sand treatment system. Its fundamental task is to mix old sand, new sand, binder (such as bentonite), auxiliary materials (such as coal powder), and water in a specific ratio and knead them thoroughly so that the binder is evenly coated on the surface of each sand grain, thereby producing molding sand that meets the casting requirements.

[0003] A roller-type sand mixer is a sand mixing device that relies on the heavy pressure and kneading of a roller to mix molding sand. Its working principle is as follows:

[0004] The electric motor drives the reduction mechanism to rotate the main shaft and crosshead. The grinding wheel on the crosshead revolves with the main shaft. At the same time, the grinding wheel will passively rotate around its own horizontal axis due to the friction generated by contact with the sand layer. The grinding wheel crushes and grinds the sand layer. The scraper system that follows will turn over and break up the compacted sand layer and send it back into the working area of ​​the grinding wheel, forming an efficient sand mixing cycle.

[0005] In actual use, after each unloading of the mixed sand, sand residue remains on the inner wall of the machine basin, the grinding wheel frame, and in dead corners. If this sand is not cleaned in time, it will harden and clump together, requiring workers to use pneumatic picks or sledgehammers to remove it, which is labor-intensive. Therefore, in order to achieve efficient cleaning of residual sand inside the machine basin after a single mixing cycle, a wet sand casting mixing device and its mixing method are provided. Summary of the Invention

[0006] The purpose of this invention is to provide a wet sand casting mixing device and a mixing method thereof in order to solve the problems mentioned above.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a wet sand casting mixing device, comprising a mixing assembly consisting of a basin, a discharge valve plate, a drive motor, a central shaft, a crosshead, a grinding wheel, and a scraper. The discharge valve plate is rotatably installed on one side of the basin and blocks the discharge port of the basin. The drive motor is installed at the bottom of the basin. The central shaft is connected to the output shaft of the drive motor and extends through the bottom of the basin to the top of the basin. The crosshead is fixedly installed on the top of the central shaft. The grinding wheel and scraper are installed around the crosshead and distributed inside the basin. A cleaning assembly is provided on the outside and top of the basin. After the sand inside the basin is discharged, the cleaning assembly is used to clean the residual sand inside the basin.

[0008] The cleaning assembly includes a flushing unit, a lifting unit, and a flushing direction switching unit;

[0009] The lifting unit is used to realize the lifting operation of the rinsing unit. When the rinsing unit is at a high position, it is away from the machine basin and does not affect the normal sand mixing operation. When the rinsing unit moves down into the machine basin, it is used to rinse the inside of the machine basin.

[0010] The rinsing direction switching unit is used to switch the rinsing direction of the rinsing unit, so as to rinse the residual sand on the inner wall side of the machine basin and the surface of the grinding wheel and scraper.

[0011] As a further embodiment of the present invention: the rinsing unit includes an annular cover, an annular partition, and a first vertical pipe;

[0012] The annular partition is fixed to the top of the inner side of the annular cover. The annular partition divides the inner cavity of the annular cover into an annular water tank, a lifting annular tank, and a storage annular groove. The lifting annular tank and the storage annular groove are distributed vertically and are located on the outside of the annular water tank.

[0013] The first vertical pipe is fixed to the top of the annular cover and communicates with the inner cavity of the annular water tank. The flushing water is supplied to the first vertical pipe, enters the annular water tank, and is sprayed out through the bottom opening of the annular water tank to realize the flushing operation inside the machine basin.

[0014] As a further embodiment of the present invention: the flushing direction switching unit includes a reversing piston unit and a second vertical tube;

[0015] The second vertical tube is fixed to the top of the annular cover and is in communication with the inner cavity of the lifting ring chamber;

[0016] The reversing piston unit consists of an annular T-shaped piston, a lower annular block, and a conical capsule, which are connected and fixed in sequence from top to bottom.

[0017] The annular T-shaped piston is vertically slidably installed inside the lifting ring chamber and extends through to the inside of the receiving ring groove. The lower ring block is vertically slidably installed inside the receiving ring groove, and the conical capsule in the contracted state is stored inside the receiving ring groove.

[0018] The top of the annular T-shaped piston is provided with a water passage groove that passes through the annular T-shaped piston and the lower ring block in sequence and communicates with the inner cavity of the conical capsule.

[0019] The lower part of the inner ring side of the annular cover has a funnel-shaped structure and the inner diameter increases from top to bottom. When the conical capsule is in a contracted state, the water flow sprayed from the annular water tank opening is inclined toward the inner wall side of the machine basin.

[0020] Water flows through the second vertical pipe into the receiving ring groove, causing the entire reversing piston unit to move downwards. It then enters the conical capsule through the water passage, causing the conical capsule to expand into a conical structure with its inner diameter decreasing from top to bottom. At this time, the water flow ejected from the opening of the annular water tank is guided by the conical capsule to impact the roller and scraper.

[0021] As a further embodiment of the present invention: multiple water channels are evenly arranged circumferentially, and the top of the annular T-shaped piston is provided with an annular groove that communicates with the multiple water channels, and the annular groove is vertically aligned with the port of the second vertical pipe.

[0022] As a further embodiment of the present invention: the first vertical pipe and the second vertical pipe are evenly arranged in multiple sets along the circumference.

[0023] As a further embodiment of the present invention: the lifting unit includes a connecting plate and a pneumatic push rod;

[0024] The connecting plate is fixed to the outer side of the two sets of symmetrically distributed first and second vertical pipes near the top.

[0025] Two pneumatic push rods are provided, symmetrically distributed on the outside of the machine basin and fixedly installed to the machine basin by a mounting bracket. The piston rod of the pneumatic push rod is fixedly connected to the bottom of the connecting plate. The operation of the pneumatic push rod is used to realize the lifting and lowering operation of the annular cover.

[0026] As a further embodiment of the present invention: a corrugated dustproof sleeve is provided on the outer side of the piston rod of the pneumatic push rod.

[0027] As a further embodiment of the present invention: a spiral guide plate is fixed on the inner side of the bottom contraction opening of the annular water tank, and multiple spiral guide plates are evenly arranged along the circumference.

[0028] As a further embodiment of the present invention: a fixed shaft cylinder is fixed at the center of the bottom of the machine basin, the top of the fixed shaft cylinder protrudes from the upper surface of the machine basin, and the central shaft passes through the fixed shaft cylinder and is rotatably connected to the fixed shaft cylinder.

[0029] A method for mixing sand in wet sand casting includes the following steps:

[0030] Step 1: Manually introduce the foundry sand raw material into the machine basin according to the set ratio or transport it through an external conveying device;

[0031] Step 2: While adding raw materials, start the drive motor. The drive motor drives the central shaft, crosshead, grinding wheel, and scraper to rotate as a whole. Due to the friction generated by the contact with the sand layer, the grinding wheel will passively rotate around its own horizontal axis. The grinding wheel crushes and grinds the sand layer. The scraper that follows will turn over and break up the compacted sand layer and send it back into the working area of ​​the grinding wheel, forming an efficient sand mixing cycle.

[0032] Step 3: After mixing is complete, manually open the discharge valve to discharge the sand from inside the machine basin;

[0033] Step 4: After the sand is discharged, the remaining sand inside the machine basin can be cleaned. At this time, first start the pneumatic push rod to move the annular cover down into the inside of the machine basin. Then, connect the first vertical pipe to the external pump body. The pump body delivers the flushing water to the annular water tank through the first vertical pipe and sprays it out through the contraction port of the annular water tank. At this time, the entire reversing piston unit is in an upward contraction state. The annular water flow sprayed from the annular water tank is directed towards the inner wall of the machine basin, thus rinsing the inner wall of the machine basin.

[0034] Step 5: The reciprocating motion of the pneumatic push rod thoroughly cleans the inner wall of the basin. Then, the second vertical pipe is connected to the external pump body. The pump body delivers the rinsing water to the inside of the lifting ring chamber through the second vertical pipe. As the water flow inside the receiving ring groove increases, the deflecting piston unit moves down as a whole, and some of the water flow enters the conical capsule through the water passage, causing the conical capsule to expand from a contracted state to a conical shape. At this time, the annular water flow sprayed from the annular water chamber is intercepted and guided by the conical capsule, flowing inward to impact the grinding wheel and scraper. With the operation of the drive motor, the grinding wheel and scraper can be rinsed.

[0035] Step Six: During the rinsing process, align the external water receiving structure with the discharge port of the machine basin, so that the residual material and water flow through the discharge port and the external water receiving structure into the external collection device.

[0036] Step 7: After cleaning, the pneumatic push rod is reset to its initial state, so that the annular cover returns to its initial height. At the same time, the water inside the conical capsule and the lifting ring chamber is pumped out, so that the reversing piston unit returns to its initial contracted state. After that, the secondary sand mixing operation can be carried out.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. By setting up a liftable cleaning component, during normal sand mixing operations, the annular cover is located high above the machine basin, which does not affect the crushing and sand mixing operations of the rollers and scrapers at all; after the sand is discharged, the pneumatic push rod drives the annular cover to automatically descend into the machine basin for rinsing, realizing the two major functions of sand mixing and online automatic cleaning. There is no need for manual handling or disassembly and assembly of the cleaning device, avoiding long-term equipment downtime due to cleaning, and greatly improving production efficiency and equipment utilization.

[0039] 2. By setting up a flushing direction switching unit composed of a reversing piston unit and a second vertical pipe, two different flushing water flows can be achieved: When water is supplied to the first vertical pipe only, the conical capsule is in a contracted state, and the annular water flow sprayed from the bottom opening of the annular water tank is inclined towards the inner wall of the machine basin, which is specifically used to flush away a large area of ​​residual sand adhering to the inner wall; when water is supplied to the second vertical pipe, the reversing piston unit moves down as a whole and the conical capsule 2063 expands into a conical structure. At this time, the annular water flow is intercepted by the conical capsule and guided to the inner side, concentrating on impacting the surface of the grinding wheel and scraper. The two flushing modes can be quickly switched through external water supply control without replacing any nozzles or manually adjusting the angle. The structure is compact and easy to operate, and it can thoroughly remove stubborn sand adhering to the core working parts such as the grinding wheel and scraper.

[0040] 3. By setting up a spiral guide plate, the spiral guide plate generates a swirling jet, which forces the flushing water to rotate and form a spiral high-pressure jet. Compared with ordinary vertical water flow, the spiral jet has stronger shearing force and tangential flushing force, which can more effectively remove the hardened sand or oily sludge residues attached to the inner wall of the basin. At the same time, the spiral water flow can rotate and move downward along the inner wall, and the flushing trajectory covers the entire circumference and height of the inner wall, with no blind spots in cleaning, which significantly improves cleaning efficiency and cleanliness. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of the present invention;

[0042] Figure 2 This is a top view of the structure of the present invention;

[0043] Figure 3 This is a cross-sectional view of the annular cover and the reversing piston unit of the present invention;

[0044] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0045] Figure 5 This is a cross-sectional exploded view of the annular cover and the reversing piston unit of the present invention;

[0046] Figure 6 This is a cross-sectional exploded view of the internal structure of the annular water tank of the present invention;

[0047] Figure 7 This is a schematic diagram of the conical capsule of the present invention in its expanded and downward-moving state;

[0048] Figure 8 This is a schematic diagram of the structural distribution of the fixed shaft cylinder of the present invention.

[0049] In the diagram: 1. Sand mixing assembly; 101. Machine basin; 102. Discharge valve plate; 103. Fixed shaft cylinder; 104. Drive motor; 105. Central shaft; 106. Crosshead; 107. Roller; 108. Scraper; 109. Mounting bracket; 2. Cleaning assembly; 201. Annular cover; 202. Annular partition; 203. Annular water tank; 204. Lifting ring tank; 205. Receiving ring groove; 206. Directional piston unit; 207. First vertical pipe; 208. Second vertical pipe; 209. Connecting plate; 210. Pneumatic push rod; 211. Corrugated dust cover; 212. Spiral guide plate;

[0050] 2061. Ring-shaped T-piston; 2062. Lower ring block; 2063. Conical capsule; 2064. Water passage groove; 2065. Annular groove. Detailed Implementation

[0051] 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.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0053] Please see Figures 1 to 8In this embodiment of the invention, a wet sand casting mixing device includes a mixing assembly 1 consisting of a basin 101, a discharge valve plate 102, a drive motor 104, a central shaft 105, a crosshead 106, a grinding wheel 107, and a scraper 108. The discharge valve plate 102 is rotatably installed on one side of the basin 101 and blocks the discharge port of the basin 101. The drive motor 104 is installed at the bottom of the basin 101. The central shaft 105 is connected to the output shaft of the drive motor 104 and extends through to the bottom and top of the basin 101. The crosshead 106 is fixedly installed on the top of the central shaft 105. The grinding wheel 107 and the scraper 108 are installed around the crosshead 106 and distributed inside the basin 101. A cleaning assembly 2 is provided on the outside and top of the basin 101. After the sand inside the basin 101 is discharged, the cleaning assembly 2 is used to clean the residual sand inside the basin 101.

[0054] Cleaning component 2 includes a rinsing unit, a lifting unit, and a rinsing direction switching unit;

[0055] The lifting unit is used to lift the rinsing unit. When the rinsing unit is at a high position, it is away from the machine basin 101 and does not affect the normal sand mixing operation. When the rinsing unit moves down into the machine basin 101, it is used to rinse the inside of the machine basin 101.

[0056] The flushing direction switching unit is used to switch the flushing direction of the flushing unit, so as to flush the residual sand material on the inner wall side of the machine basin 101 and the surface of the grinding wheel 107 and scraper 108.

[0057] The flushing unit includes an annular cover 201, an annular partition 202, and a first vertical pipe 207;

[0058] An annular partition 202 is fixed to the top of the inner side of the annular cover 201. The annular partition 202 divides the inner cavity of the annular cover 201 into an annular water tank 203, a lifting annular tank 204, and a receiving annular groove 205. The lifting annular tank 204 and the receiving annular groove 205 are distributed vertically and on the outside of the annular water tank 203.

[0059] The first vertical pipe 207 is fixed to the top of the annular cover 201 and communicates with the inner cavity of the annular water tank 203. The flushing water is supplied to the first vertical pipe 207 to enter the annular water tank 203 and sprayed out through the bottom opening of the annular water tank 203 to realize the flushing operation of the inside of the basin 101.

[0060] The flushing direction switching unit includes a reversing piston unit 206 and a second vertical pipe 208;

[0061] The second vertical tube 208 is fixed to the top of the annular cover 201 and is in communication with the inner cavity of the lifting ring chamber 204;

[0062] The reversing piston unit 206 is composed of an annular T-shaped piston 2061, a lower annular block 2062, and a conical capsule 2063, which are connected and fixed sequentially from top to bottom.

[0063] The annular T-shaped piston 2061 is vertically slidably installed inside the lifting ring chamber 204 and extends through to the inside of the storage ring groove 205. The lower ring block 2062 is vertically slidably installed inside the storage ring groove 205. The conical capsule 2063 in the contracted state is stored inside the storage ring groove 205.

[0064] The top of the annular T-shaped piston 2061 is provided with a water passage 2064 that passes through the annular T-shaped piston 2061 and the lower ring block 2062 in sequence and communicates with the inner cavity of the conical capsule 2063.

[0065] The lower part of the inner ring side of the annular cover 201 has a funnel-shaped structure and the inner diameter increases from top to bottom. When the conical capsule 2063 is in a contracted state, the water jet from the opening of the annular water tank 203 is tilted towards the inner wall side of the machine basin 101.

[0066] Water flows through the second vertical pipe 208 into the receiving ring groove 205, causing the deflecting piston unit 206 to move downward as a whole, and then through the water passage 2064 into the conical capsule 2063, causing the conical capsule 2063 to expand into a conical structure and its inner diameter to decrease from top to bottom. At this time, the water flow sprayed from the opening of the annular water tank 203 is guided by the conical capsule 2063 to impact the roller 107 and scraper 108.

[0067] The lifting unit includes a connecting plate 209 and a pneumatic push rod 210;

[0068] The connecting plate 209 is fixed to the outer side of the two symmetrically distributed first vertical pipes 207 and second vertical pipes 208 near the top.

[0069] There are two pneumatic push rods 210, which are symmetrically distributed on the outside of the machine basin 101 and fixedly installed on the machine basin 101 through the mounting bracket 109. The piston rod of the pneumatic push rod 210 is fixedly connected to the bottom of the connecting plate 209. The operation of the pneumatic push rod 210 is used to realize the lifting and lowering operation of the annular cover 201.

[0070] In this embodiment: the wet sand casting sand mixing method, using the above-mentioned wet sand casting sand mixing device, includes the following steps:

[0071] Step 1: Manually introduce the raw material of casting sand into the machine basin 101 according to the set ratio or transport it through an external conveying device;

[0072] Step 2: While adding raw materials, start the drive motor 104. The drive motor 104 drives the central shaft 105, crosshead 106, grinding wheel 107, and scraper 108 to rotate as a whole. Due to the friction generated by the contact with the sand layer, the grinding wheel 107 will passively rotate around its own horizontal axis. The grinding wheel 107 crushes and grinds the sand layer. The scraper 108 that follows will turn over and break up the compacted sand layer and send it back into the working area of ​​the grinding wheel 107, forming an efficient sand mixing cycle.

[0073] Step 3: After mixing is complete, manually open the discharge valve plate 102 to discharge the sand material inside the machine basin 101;

[0074] Step 4: After the sand is discharged, the remaining sand inside the machine basin 101 can be cleaned. At this time, the pneumatic push rod 210 is activated to move the annular cover 201 down into the inside of the machine basin 101. Then, the first vertical pipe 207 is connected to the external pump body. The pump body delivers the flushing water to the annular water tank 203 through the first vertical pipe 207 and sprays it out through the contraction port of the annular water tank 203. At this time, the deflector piston unit 206 is in an upward contraction state. Therefore, the annular water flow sprayed out by the annular water tank 203 is directed towards the inner wall side of the machine basin 101, thereby flushing the inner wall side of the machine basin 101.

[0075] Step 5: The reciprocating motion of the pneumatic push rod 210 achieves thorough cleaning of the inner wall of the basin 101. Then, the second vertical pipe 208 is connected to the external pump body. The pump body delivers the rinsing water through the second vertical pipe 208 to the inside of the lifting ring chamber 204. As the water flow inside the receiving ring groove 205 increases, the deflecting piston unit 206 moves down as a whole, and a portion of the water flow enters the conical capsule 2063 through the water passage 2064, causing the conical capsule 2063 to expand from a contracted state to a conical shape. At this time, the annular water flow sprayed from the annular water chamber 203 is intercepted and guided by the conical capsule 2063, flowing inward to impact the grinding wheel 107 and scraper 108. With the operation of the drive motor 104, the grinding wheel 107 and scraper 108 can be rinsed.

[0076] It should be further noted that: the lowest position of the annular cover 201 does not contact the working area of ​​the scraper 108, that is, it is above the scraper 108. Simultaneously, the outer diameter of the annular cover 201 is smaller than the inner diameter of the machine basin 101, and the inner diameter of the annular cover 201 is larger than the outer diameter of the grinding wheel 107 (e.g., ...). Figure 2 Therefore, the up-and-down movement of the annular cover 201 does not interfere with the rotation of the grinding wheel 107 and the scraper 108, and does not come into contact with or rub against the residual sand on the inner wall of the machine basin 101.

[0077] Step Six: During the rinsing process, the external water receiving structure is aligned with the discharge port of the machine basin 101, so that the residual material and water flow through the discharge port and the external water receiving structure into the external collection device for subsequent centralized processing.

[0078] Step 7: After cleaning, the pneumatic push rod 210 is reset to its initial state, so that the annular cover 201 returns to its initial height. At the same time, the water inside the conical capsule 2063 and the lifting ring chamber 204 is sucked out, so that the reversing piston unit 206 returns to its initial contracted state. After that, the secondary sand mixing operation can be carried out.

[0079] Please refer to this carefully. Figures 1 to 5 Multiple water passages 2064 are evenly arranged around the circumference, and the top of the annular T-shaped piston 2061 is provided with an annular groove 2065 that communicates with the multiple water passages 2064. The annular groove 2065 is vertically aligned with the port of the second vertical pipe 208.

[0080] Multiple sets of the first vertical tube 207 and the second vertical tube 208 are evenly arranged along the circumference.

[0081] In this embodiment: multiple water channels 2064 are evenly arranged circumferentially to ensure that the conical capsule 2063 can obtain a uniform water pressure distribution when it expands;

[0082] The annular groove 2065 at the top of the annular T-shaped piston 2061 connects the upper ports of all water passages 2064 in series, and the annular groove 2065 is vertically aligned with the lower port of the second vertical pipe 208. When flushing water is injected from the second vertical pipe 208, the water flow first enters the annular groove 2065, then is evenly distributed to each water passage 2064 through the annular groove 2065, and finally enters the conical capsule 2063. This ensures that the conical structure formed after the conical capsule 2063 expands is complete and concentric, thereby achieving uniform guidance of the water flow sprayed from the annular water tank 203.

[0083] Multiple sets of first vertical pipes 207 and second vertical pipes 208 are evenly arranged circumferentially. The multiple sets of first vertical pipes 207 supply water in parallel, which can ensure that the water pressure is balanced throughout the annular water tank 203. This ensures that the flow rate and pressure of the annular water jet from the bottom opening of the annular water tank 203 are uniform and stable, avoiding local flushing blind spots. Similarly, the multiple sets of second vertical pipes 208 supply water to the lifting annular tank 204 in parallel, which can quickly and evenly establish water pressure in the receiving annular groove 205, so that the annular T-shaped piston 2061 moves down smoothly as a whole. At the same time, it ensures that each water passage 2064 has sufficient water flow into each conical capsule 2063, so that the conical capsule 2063 expands synchronously and evenly in the circumferential direction, ensuring a consistent guiding effect on the water flow.

[0084] Please refer to this carefully. Figure 1 , Figure 3 A corrugated dust cover 211 is fitted on the outside of the piston rod of the pneumatic push rod 210.

[0085] In this embodiment, the corrugated dust cover 211 has a retractable folded corrugated structure. Its two ends are connected to the front end of the cylinder of the pneumatic push rod 210 and the extended end of the piston rod, respectively. When the pneumatic push rod 210 drives the annular cover 201 to rise and fall, the corrugated dust cover 211 extends and retracts accordingly. This is used to prevent foreign objects such as sand, water mist, and residual sand particles generated during sand mixing and rinsing from adhering to or intruding into the surface of the piston rod. This avoids the piston rod from being worn or scratched by foreign objects during reciprocating motion, thereby extending the service life of the pneumatic push rod 210 and ensuring the long-term stable operation of the lifting unit.

[0086] Please refer to this carefully. Figures 4 to 6 A spiral guide plate 212 is fixed on the inner side of the bottom contraction opening of the annular water tank 203, and multiple spiral guide plates 212 are evenly arranged along the circumference.

[0087] In this embodiment: when the rinsing water flows down from the annular water tank 203 through the bottom constriction port, the spiral guide plate 212 forces the water flow to rotate, transforming the originally vertically falling annular water flow into a spiral high-pressure jet with a circumferential swirling effect. When this spiral water flow impacts the inner wall of the machine basin 101, it can generate stronger shearing and peeling forces, more effectively flushing away stubborn residual sand adhering to the inner wall. At the same time, the spiral water flow can rotate downward along the inner wall, expanding the flushing coverage area and significantly improving cleaning efficiency and cleanliness.

[0088] Please refer to this carefully. Figure 1 , Figure 3 , Figure 8 A fixed shaft cylinder 103 is fixed at the center of the bottom of the machine basin 101. The top of the fixed shaft cylinder 103 protrudes from the upper surface of the machine basin 101. The central shaft 105 passes through the fixed shaft cylinder 103 and is rotatably connected to the fixed shaft cylinder 103.

[0089] In this embodiment, the central shaft 105 passes through the fixed shaft cylinder 103 and is rotatably connected to the fixed shaft cylinder 103 via a bearing. The fixed shaft cylinder 103 serves multiple functions: firstly, it provides support for the rotation of the central shaft 105; secondly, it prevents sand from seeping into the rotation gap. When cleaning is performed by the cleaning component 2, the water flow will not contact the central shaft 105 and will not affect the rotation of the central shaft 105. In addition, it should be noted that the rotating part of the grinding wheel 108 is provided with a corresponding sealing structure.

[0090] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wet sand casting mixing device, comprising a mixing assembly (1) consisting of a machine basin (101), a discharge valve plate (102), a drive motor (104), a central shaft (105), a crosshead (106), a rolling wheel (107), and a scraper (108); The discharge valve plate (102) is rotatably mounted on one side of the machine basin (101) and blocks the discharge port of the machine basin (101); the drive motor (104) is mounted on the bottom of the machine basin (101); the central shaft (105) is connected to the output shaft of the drive motor (104) and extends through to the bottom of the machine basin (101) and to the top of the machine basin (101); the crosshead (106) is mounted and fixed on the top of the central shaft (105); the grinding wheel (107) and scraper (108) are mounted around the crosshead (106) and distributed inside the machine basin (101); characterized in that: A cleaning component (2) is provided on the outside and above of the machine basin (101). After the sand inside the machine basin (101) is discharged, the cleaning component (2) is used to clean the residual sand inside the machine basin (101). The cleaning assembly (2) includes a rinsing unit, a lifting unit, and a rinsing direction switching unit; The lifting unit is used to realize the lifting operation of the rinsing unit. When the rinsing unit is at a high position, it is far away from the machine basin (101) and does not affect the normal sand mixing operation. The rinsing unit moves down into the machine basin (101) to perform rinsing operation on the inside of the machine basin (101). The flushing direction switching unit is used to switch the flushing direction of the flushing unit, so as to flush the residual sand on the inner wall side of the machine basin (101), the grinding wheel (107) and the scraper (108).

2. The wet sand casting mixing device according to claim 1, characterized in that, The flushing unit includes an annular cover (201), an annular partition (202), and a first vertical pipe (207). The annular partition (202) is fixed to the top of the inner side of the annular cover (201). The annular partition (202) divides the inner cavity of the annular cover (201) into an annular water tank (203), a lifting annular tank (204), and a receiving annular groove (205). The lifting annular tank (204) and the receiving annular groove (205) are distributed vertically and are located outside the annular water tank (203). The first vertical pipe (207) is fixed to the top of the annular cover (201) and communicates with the inner cavity of the annular water tank (203). The flushing water is supplied to the first vertical pipe (207) to enter the annular water tank (203) and sprayed out through the bottom opening of the annular water tank (203) to realize the flushing operation inside the machine basin (101).

3. The wet sand casting mixing device according to claim 2, characterized in that, The flushing direction switching unit includes a reversing piston unit (206) and a second vertical tube (208). The second vertical tube (208) is fixed to the top of the annular cover (201) and communicates with the inner cavity of the lifting ring chamber (204); The reversing piston unit (206) is composed of an annular T-shaped piston (2061), a lower annular block (2062) and a conical capsule (2063), which are connected and fixed from top to bottom. The annular T-shaped piston (2061) is vertically slidably installed inside the lifting ring chamber (204) and extends through to the inside of the receiving ring groove (205). The lower ring block (2062) is vertically slidably installed inside the receiving ring groove (205). The conical capsule (2063) in the contracted state is stored inside the receiving ring groove (205). The top of the annular T-shaped piston (2061) is provided with a water passage (2064) that passes through the annular T-shaped piston (2061) and the lower ring block (2062) and communicates with the inner cavity of the conical capsule (2063). The lower part of the inner ring side of the annular cover (201) has a funnel-shaped structure and the inner diameter increases from top to bottom. When the conical capsule (2063) is in a contracted state, the water flow sprayed from the opening of the annular water tank (203) is inclined toward the inner wall side of the machine basin (101). Water flows through the second vertical pipe (208) into the receiving ring groove (205), causing the deflecting piston unit (206) to move downward as a whole, and enters the conical capsule (2063) through the water passage (2064), causing the conical capsule (2063) to expand into a conical structure and its inner diameter to decrease from top to bottom. At this time, the water flow sprayed from the opening of the annular water tank (203) is guided by the conical capsule (2063) to impact the roller (107) and scraper (108).

4. The wet sand casting mixing device according to claim 3, characterized in that, The water passage (2064) is evenly arranged in multiple circumferential directions, and the top of the annular T-shaped piston (2061) is provided with an annular groove (2065) that communicates with the multiple water passages (2064). The annular groove (2065) is vertically aligned with the port of the second vertical pipe (208).

5. A wet sand casting mixing device according to claim 3, characterized in that, The first vertical tube (207) and the second vertical tube (208) are evenly arranged in multiple sets along the circumference.

6. A wet sand casting mixing device according to claim 3, characterized in that, The lifting unit includes a connecting plate (209) and a pneumatic push rod (210). The connecting plate (209) is fixed to the outside of the two sets of symmetrically distributed first vertical pipes (207) and second vertical pipes (208) near the top; Two pneumatic push rods (210) are provided. The two pneumatic push rods (210) are symmetrically distributed on the outside of the machine basin (101) and fixedly installed to the machine basin (101) through the mounting bracket (109). The piston rod of the pneumatic push rod (210) is fixedly connected to the bottom of the connecting plate (209). The operation of the pneumatic push rod (210) is used to realize the lifting operation of the annular cover (201).

7. A wet sand casting mixing device according to claim 6, characterized in that, The piston rod of the pneumatic push rod (210) is fitted with a corrugated dust cover (211).

8. A wet sand casting mixing device according to claim 3, characterized in that, A spiral guide plate (212) is fixed on the inner side of the bottom contraction opening of the annular water tank (203), and multiple spiral guide plates (212) are evenly arranged along the circumference.

9. A wet sand casting mixing device according to claim 1, characterized in that, A fixed shaft cylinder (103) is fixed at the center of the bottom of the machine basin (101). The top of the fixed shaft cylinder (103) protrudes from the upper surface of the machine basin (101). The central shaft (105) passes through the fixed shaft cylinder (103) and is rotatably connected to the fixed shaft cylinder (103).

10. A method for mixing sand in wet sand casting, applied to the wet sand casting mixing apparatus as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Manually introduce the raw material for casting sand into the machine basin (101) according to the set ratio or transport it through an external conveying device; Step 2: While adding raw materials, start the drive motor (104). The drive motor (104) drives the central shaft (105), crosshead (106), grinding wheel (107), and scraper (108) to rotate as a whole. Due to the friction generated by the contact with the sand layer, the grinding wheel (107) will passively rotate around its own horizontal axis. The grinding wheel (107) will crush and grind the sand layer. The scraper (108) that follows will turn over and break up the compacted sand layer and send it back into the working area of ​​the grinding wheel (107) to form an efficient sand mixing cycle. Step 3: After mixing is complete, manually open the discharge valve plate (102) to discharge the sand material inside the machine basin (101); Step 4: After the sand is discharged, the residual sand inside the machine basin (101) can be cleaned. At this time, the pneumatic push rod (210) is started first to move the annular cover (201) down into the inside of the machine basin (101). Then, the first vertical pipe (207) is connected to the external pump body. The pump body delivers the flushing water to the annular water tank (203) through the first vertical pipe (207) and sprays it out through the contraction port of the annular water tank (203). At this time, the reversing piston unit (206) is in an upward contraction state. The annular water flow sprayed out by the annular water tank (203) is directed towards the inner wall side of the machine basin (101) to achieve flushing of the inner wall side of the machine basin (101). Step 5: The inner wall of the machine basin (101) is thoroughly cleaned by the reciprocating operation of the pneumatic push rod (210). Then, the second vertical pipe (208) is connected to the external pump body. The pump body delivers the rinsing water to the inside of the lifting ring chamber (204) through the second vertical pipe (208). As the water flow inside the receiving ring groove (205) increases, the deflecting piston unit (206) moves down as a whole, and a part of the water flow enters the conical capsule (2063) through the water passage (2064), causing the conical capsule (2063) to expand from a contracted state to a conical shape. At this time, the annular water flow sprayed from the annular water chamber (203) is intercepted and guided by the conical capsule (2063), flowing inward to impact the grinding wheel (107) and scraper (108). With the operation of the drive motor (104), the grinding wheel (107) and scraper (108) can be rinsed. Step 6: During the rinsing process, the external water receiving structure is aligned with the discharge port of the machine basin (101) so that the residual material and water flow through the discharge port and the external water receiving structure into the external collection device. Step 7: After cleaning, the pneumatic push rod (210) is reset to the initial state, so that the annular cover (201) is restored to the initial height. At the same time, the water inside the conical capsule (2063) and the lifting ring chamber (204) is sucked out, so that the reversing piston unit (206) is restored to the initial contraction state. After that, the secondary sand mixing operation can be carried out.

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