70results about "Mould handling/dressing devices" patented technology

This utility model relates to the field of crushing device technology, specifically disclosing a crushing device for recovering coated sand, including a base, a crushing cylinder fixedly installed on the top of the base, a feeding channel fixedly connected to the top of the crushing cylinder, a rotating rod rotatably arranged inside the crushing cylinder, a uniformly distributed and symmetrically arranged cutting blade fixedly installed on the rotating rod, an arc-shaped filter plate arranged on the bottom surface of the crushing cylinder, a conveying channel fixedly connected to the bottom surface of the crushing cylinder at a point on the arc-shaped filter plate, a bottom cylinder fixedly connected to the bottom of the conveying channel, a movable disc rotatably arranged inside the bottom cylinder, a rotating rod 2 arranged inside the bottom cylinder, the rotating rod 2 arranged on the movable disc, a distributed and symmetrically arranged movable column fixedly installed on the rotating rod 2, and a magnetic column arranged inside the movable column. This crushing device for recovering coated sand can directly adsorb metal impurities in the crushed coated sand, improving the purity of the recovered coated sand and having strong practicality.

The application discloses a collapsible water glass sand proportioning optimization device and method, and relates to the field of sand proportioning optimization devices.The device comprises: a stirring tank for stirring mixed materials; a spiral feeder comprising two and respectively used for adding old sand and new sand to the stirring tank; a reagent adding tank for storing reagents, which comprises two and stores the same reagents; a reagent adding device comprising two sets of piston type feeding devices and a driving device for driving the movement of the piston rods of the piston type feeding devices, the two sets of piston type feeding devices are respectively communicated with the two reagent adding tanks and are both communicated with the stirring tank, and the driving device asynchronously drives the two sets of piston type feeding devices so that when the driving device is turned on, one set of piston type feeding device always adds reagents to the stirring tank and the other set of piston type feeding device extracts reagents. The application firstly realizes uninterrupted feeding through the two sets of piston type feeding devices driven asynchronously; in addition, the rotation of the output shaft is bidirectionally controlled through the planet gear structure driven bidirectionally, which not only can amplify the number of rotation circles, but also can more finely control the feeding speed, which is beneficial to improve the accurate control of reagent adding; finally, the eccentric hinge position of the connecting rod is adjusted through the piston type sliding adjustment structure arranged on the eccentric disc to adjust the limit value of the adding amount, and the double adjustment mechanism is formed in cooperation with the rotation speed, which provides favorable conditions for adjusting the proportion in the proportioning process.

This invention relates to the field of casting technology for sand cores and sand shells, and particularly to a method for preparing high-precision casting sand cores and sand shell components based on a coated sand process. The method includes the following steps: rinsing quartz sand and reacting it with a sodium silicate solution to obtain coated quartz sand; adding 3-aminopropyltriethoxysilane and water to the coated quartz sand in a high-speed mixer; sequentially adding modified benzoxazine resin, calcium citrate, magnesium chloride, hyperbranched polyamide, and polycaprolactone-grafted starch to obtain finished coated sand; plasma-treated chromium-12 molybdenum-vanadium mold steel to obtain an amino-modified mold; sand-jetting the finished coated sand into left / right half-shells; shaping and pre-embedding chromite sand cores with chills to obtain left / right half-shell green blanks; milling the surfaces of the left / right half-shell green blanks, coating them with resin, butt-jointing, curing, and deburring to obtain the casting sand core and sand shell. This method solves the problems of poor mechanical strength, poor high-temperature stability, low production efficiency, and poor environmental performance in high-precision casting sand cores and sand shells.

The utility model relates to the sand production technical field especially relates to an internal cleaning structure for rotor sand mixer. Its technical scheme includes: machine body bottom plate, plug and slide plate, is equipped with wear -resisting ring at the clean window of machine body bottom plate, the slide plate is established in the just below of clean window through the translation component, the translation component is used for controlling slide plate to carry out horizontal linear motion, the plug is established on the slide plate through the lifting assembly, and the plug is inserted in the wear -resisting ring, the lifting assembly is used for controlling plug to carry out vertical linear motion. The utility model discloses through the clean window of openable cooperation lifting and translation component, has realized the free extension of cleaning tool and quick closure, has promoted the cleaning efficiency and has ensured the sealed safety.

The utility model relates to the technical field of dust hood of drop machine, and the utility model provides a dust hood of drop machine, it is equipped with two groups of dust suction mouth on both sides of the cover body symmetry, two groups of dust suction mouth all include at least one dust suction mouth, and two groups of dust suction mouth are misaligned setting, and the cover body is used to cover and set on the drop machine to prevent dust flying. Through the above technical scheme, the suction force generated by the dust suction mouth can form a more uniform and orderly airflow flow field in the dust hood, reducing the gas turbulence phenomenon, thereby effectively avoiding dust overflow, facilitating dust control and collection.

The present application relates to the field of foundry, especially to a kind of organic resin foundry waste sand recycling equipment, including mounting frame, cylinder, limiting frame and drive unit etc.;Mounting frame is connected with drive unit. Drive unit is connected with cylinder. Drive unit is connected with limiting frame, and drive unit is used to drive cylinder to lift and rotate, and also used to drive limiting frame to move. Cylinder is installed with annular knife. Mounting frame is fixedly connected with sieve plate. Sieve plate is fixedly connected with fixing ring for positioning sand box. Mounting frame is fixedly connected with collecting hopper, and collecting hopper is located below sieve plate. Cylinder is connected with cleaning unit for cleaning casting wheel. The equipment breaks waste sand by rotating and applying downward pressure, makes it loose and falls down, after waste sand passes through sieve plate, it falls into lower collecting container through collecting hopper, at the same time, when brush plate one contacts with the upper surface of casting wheel, it can brush the upper surface and the upper surface of rib to clean and remove attached waste sand.

This invention relates to the technical field of foundry sand grinding devices. This application discloses a foundry sand grinding device with adjustable fineness, including an upper grinding disc and a lower grinding disc. The lower grinding disc is disposed below the upper grinding disc. A control component is disposed on the top surface of the upper grinding disc for controlling the rotation and vertical movement of the upper grinding disc. A drive component is disposed on the bottom surface of the lower grinding disc for controlling the rotation of the lower grinding disc. This invention uses a movable upper grinding disc to control the distance between the upper and lower grinding discs during grinding, thereby controlling the grinding particle size. Combined with the non-concentric rotation of the upper and lower grinding discs at different speeds, the grinding effect between the upper and lower grinding discs is fully guaranteed. Furthermore, the rotatable design of the lower grinding disc greatly reduces the pressure and friction of the foundry sand ground to the required particle size range by the upper and lower grinding discs during the grinding process, allowing it to be discharged under the action of centrifugal force, thus greatly reducing the possibility of over-grinding.

A process for producing a casting mold, comprising the following steps: - Providing a mold (1) with at least two mold parts which can be arranged so that they enclose a cavity (K) between them, - Arranging a filling device (2) on at least one first mold part of the at least two mold parts, such that a first cavity (H) remains between a surface area (1.1) of the first mold part, which limits the cavity (K) that can be formed between the mold parts, and the filling device (2), which is a partial area of ​​the cavity (K) that can be formed between the mold parts, - Introducing a molding material (3) into the first cavity (H) through one or more channels (2.2) formed in or by the filling device (2), - Removal of the filling device (2), whereby the molding material (3) remains on the first mold part, - Arranging a calibration device (4) on the first mold part, such that a second cavity (H') is formed between the first mold part and the calibration device (4), which contains the molding material (3), such that a surface area (4.1) of the calibration device (4) limiting the second cavity (H') contacts the molding material (3), - Heating the surface area (4.1) of the calibration device (4) that defines the second cavity (H') and a surface area of ​​the first mold part that defines the second cavity (H'), - Removal of the calibration device (4), - Arranging the first mold part, on which the molding material (3) is arranged, on at least one further mold part of the at least two mold parts, so that the cavity (K) is formed between them, wherein the molding material (3) is arranged within the cavity (K) on the surface area (1.1) of the first mold part, which delimits the cavity (K), and a free volume of the cavity (K) defines a mold for a molded part (5) to be cast.

This invention relates to the field of casting technology, specifically to a resin sand regeneration treatment device for an automated ferrous metal casting apparatus. The top of the mounting base plate is fixedly connected to a mounting clamping block, the top of the mounting clamping block is fixedly connected to a mounting cover plate, the top of the mounting cover plate is fixedly connected to a support column plate, and the top of the support column plate is fixedly connected to a magnetic separation chamber. Side cover rings are fixedly connected to both ends of the magnetic separation chamber, and material inlets are fixedly connected to the inner sides of each side cover ring. An inclined conveyor plate is slidably engaged inside the magnetic separation chamber, and protective plates are provided on both sides of the inclined conveyor plate, which are fixedly connected to the magnetic separation chamber. A mounting side plate is fixedly connected to the top of the mounting base plate, and a conveyor motor is mounted on the top of the mounting side plate. A conveyor shaft is fixedly connected to the output end of the conveyor motor. During operation, the equipment achieves efficient recycling and reuse of waste resin sand through multi-stage processing of materials, including magnetic separation, desizing, and screening.

The invention relates to a system for recovering foundry sand comprising: a rotary drum open at its upper base for depositing the sand to be recovered therein, a cover which can adopt an open position for allowing passage through the upper base of the rotary drum, and a closed position for closing passage through said upper base, and means for generating electromagnetic radiation installed on the cover, such that when the cover is arranged closing the upper base of the rotary drum, the electromagnetic radiation generated is directed towards the inside of the rotary drum. This technique for recovering foundry sand based on the use of microwave energy successfully cleans the sand at great speed, preventing CO2 emissions, and with low energy consumption.

The application discloses carbon-coated regenerated baking sand based on thermal regeneration and a preparation process and application thereof, and belongs to the technical field of casting waste resource utilization.The process comprises the following steps: after waste phenolic resin coated sand is crushed, screened, and magnetically and air selected, the surface of the waste phenolic resin coated sand is pre-coated by using an additive; then the waste phenolic resin coated sand is subjected to segmented heating carbonization baking under an inert atmosphere, so that the resin is pyrolyzed and carbonized in situ to form a carbon film; and then the waste phenolic resin coated sand is subjected to mechanical rubbing and shaping and air selection grading, so that the regenerated baking sand coated with a dense carbon film is prepared.The resin pollutants on the surface of the waste sand are converted into a functional carbon coating with hydrophobic, oleophilic and low-expansion characteristics through the synergistic process of interface modification, secondary reinforcement, gradient carbonization and mechanical shaping.The obtained product has high strength and excellent collapsibility in the application of casting coated sand, has excellent mechanical properties and water resistance and chemical corrosion resistance in building materials, and realizes high-value regeneration and utilization of the casting waste sand.

This invention relates to a continuous cleaning device for molding sand, specifically for cleaning and refurbishing. The device comprises multiple parallel rollers for agitating and cleaning the molding sand. Each roller has a material inlet and outlet at each end. All rollers are inclined so that the material inlet of each roller is higher than its outlet. Adjacent rollers are staggered so that the material inlet of the next roller is lower than the material outlet of the previous roller. Each roller has a permeable conveying ramp at its tail end. The upper end of the ramp corresponds to the water outlet of the corresponding roller, and the lower end extends above the material inlet of the adjacent roller. This continuous cleaning device, through its ingenious layout design, can automatically and continuously complete different cleaning tasks for molding sand.

To advantageously provide casting sand that achieves low mold expansion of a casting mold and thereby gives the casting mold capable of effectively suppressing dimensional deformation during casting.SOLUTION: Casting sand mainly composed of SiO2-based refractory aggregate has a shape factor of 1.40 or more and an amount of oolitics present on a sand surface is 10 mass% or more of the total casting sand, thereby obtaining casting sand for a low expansion mold.SELECTED DRAWING: None

The utility model relates to a vibrating screen belongs to precision casting technical field, solves the problem of the prior art vibrating screen noise is big, and the problem of inconvenient cleaning. The utility model discloses a screen body, connecting assembly and lifting assembly, the screen body sets up below the sand shower machine, and connecting assembly is used for connecting the screen body and the sand shower machine, and lifting assembly sets up the one end of screen body far from connecting assembly, is used for the screen body elevating, and connecting assembly is the belt structure, and lifting assembly includes steel wire rope and ratchet. The utility model can realize vibrating screen noise small, and it is convenient to clean.

The utility model discloses a kind of anti-sticking type discharge structures for rotor sand mixer, it is related to sand mixer discharge technical field, including sand mixing machine main body and being set in sand mixing machine side and with the discharge pipe of sand mixing machine main body inside intercommunication, discharge door of closed sand mixing machine main body and discharge pipe is arranged in the discharge pipe, the end of discharge pipe is fixedly connected with discharge shell, discharge impeller is rotatably arranged in the inside of discharge shell, intermittent mechanism for driving discharge impeller intermittent rotation is installed on the outer wall of discharge shell, scraper for cleaning discharge impeller is arranged in discharge shell, gear transmission assembly is arranged between scraper and gap mechanism to realize differential motion. The utility model is through arc-shaped discharge plate intermittent rotation and scraper differential cleaning, after arc-shaped discharge plate rotation, ration discharging, while discharging, scraper can contact arc-shaped discharge plate to remove sand, blockage rate reduces, solve the frequent blockage problem caused by sand accumulation in traditional discharge port.

This invention discloses a casting tilting device for sand casting production, relating to the field of sand casting technology. It includes a main body, a placement plate, a baffle, and a sand-dispersing plate. The placement plate, baffle, and sand-dispersing plate are movably installed inside the main body. Clamping plates are symmetrically installed at the upper end of the placement plate, and the two sets of clamping plates are movably connected to the baffle. By incorporating the baffle, when the sand box is tilted to 35 degrees, the baffle precisely engages and locks with the upper opening of the sand box, effectively sealing the opening and preventing molding sand and castings from being directly ejected during tilting, thus preventing material spillage and contamination of the work site and reducing material waste. Even after the sand box is tilted to 120 degrees, the baffle remains covering the opening, limiting the drop distance between the casting and the sand-dispersing plate, preventing damage from high-altitude falls, reducing product scrap rates, and improving the quality of finished castings.

This invention provides a sand core removal device for casting and its application in the production of new energy motor housings. The device includes a frame containing a rolled tube housing with a vortex-shaped air injection pipe inside. A winding motor drives a rotating connecting sleeve to rotate on one side of the rolled tube housing, while a high-pressure air pump connected to the air injection pipe is mounted on the other side. An outlet is located on one side of the rolled tube housing. A flexible sleeve is connected to the outlet pipe side of the frame, with a sealing clamping mechanism connected to its free end. The free end of the sealing clamping mechanism is connected to a sand guide sleeve. Two X-shaped support clamping arms are hinged to the opening of the sand guide sleeve. Each support clamping arm includes a connecting part, a gripping arm, and an inner support arm. An elastic support member is located between the inner side of the gripping arm and the outer wall of the sand guide sleeve, causing the inner support arm to tend to expand outwards. The free end of the air injection pipe passes sequentially through the connecting flexible sleeve, the sealing clamping mechanism, and the sand guide sleeve. A sand outlet connector is connected to the side wall of the sand guide sleeve. This invention removes sand cores by injecting high-pressure airflow, which can quickly and thoroughly remove sand cores and reduce labor intensity.

The utility model discloses a grinding and screening device for foundry waste sand recovery belongs to foundry waste sand recovery technical field. Grinding and screening device for foundry waste sand recovery, including screening box, be equipped with several levels of sieve basket in the screening box, place the grinding ball in the sieve basket, and the sieve basket is connected through the linkage of connecting rod, and the upper end of connecting rod is connected with the cylinder, drives sieve basket both ends to shake up and down, and the bottom of screening box is equipped with the inclined export bottom plate. The utility model discloses through the sieve basket shaking and the synergistic effect of grinding ball, realizes the synchronous crushing and grading of waste sand, improves the processing efficiency, and the multistage screen is matched with the electromagnetic adsorption plate, and the automatic separation of grindable and ungrindable material is avoided, and the shaking design of export bottom plate avoids the accumulation of fine sand, ensures the screening continuity, and the sieve basket is inclined and shakes continuously, and the combined grinding ball impact, effectively prevents the mesh blockage, and the structure of screening box is closed and the design of guide material passage.

To provide a casting apparatus and casting method that can reuse hydrogen gas recovered within the casting apparatus. [Solution] A casting apparatus comprising a mold 1, a hydrogen combustor 2 capable of raising the temperature of the mold 1, and a hydrogen recoverer 8 capable of recovering hydrogen contained in the casting apparatus 10, wherein the hydrogen recovered by the hydrogen recoverer 8 can be supplied to the hydrogen combustor 2. A casting method using the casting apparatus 10, in which the hydrogen recovered from within the casting apparatus 10 is burned and used to raise the temperature of the mold 1.

The utility model discloses a casting mobile sand mixer, including rotating seat, lifting screw conveyor and rotating screw conveyor, lifting screw conveyor connects on rotating seat, rotating screw conveyor feed end rotatory connection is on lifting screw conveyor discharge end, including dustproof device, dustproof device connects on rotating screw conveyor, a kind of casting mobile sand mixer of the utility model, its simple structure, it is convenient and practical to be through dust guide pipe and the dust generated when guiding sand are quickly sucked out, avoid the dust situation when sand fills mould, reach the purpose of guaranteeing working environment.

This invention discloses a low-carbon titanium-reinforced environmentally friendly wear-resistant alloy and its preparation process, belonging to the field of wear-resistant materials technology. The alloy, by weight, contains 84-96 parts of low-carbon pure iron, 6-12 parts of medium-carbon ferromanganese, 0.6-1.2 parts of microcrystalline graphite, and 1.4-2.2 parts of titanium-based composite alloy, etc., with no active addition of chromium or nickel. Chromium is a raw material impurity ≤0.04%, and the carbon content is controlled at 0.5%-0.9%. The preparation process includes raw material modification, three-stage refining, recycled sand mold preparation, low-pressure casting, and dual-temperature heat treatment. Performance improvement is achieved through titanium-based composite reinforcement, rare earth purification, and gradient deoxidation. It boasts a high resource recycling rate and is suitable for manufacturing wear-resistant parts for mining and building materials equipment, solving problems such as poor environmental performance, performance imbalance, and low process adaptability of traditional materials.

The utility model discloses a casting waste sand magnetic separation device which comprises a chute, a power motor, a vibration hinge rod, a magnetic separation device, a belt conveyor, a crankshaft, a transmission belt and a rack, the power motor, the magnetic separation device and the belt conveyor are installed on the rack, and the magnetic separation device and the belt conveyor are matched with each other. One end of the chute is connected with the magnetic separation device, a power rod of the power motor is movably connected with the crankshaft, the two ends of the vibration hinge rod are movably connected with the crankshaft and the other end of the chute respectively, the power rod of the power motor and the power input end of the magnetic separation device are both connected with transmission belt wheels, and the two transmission belt wheels are in transmission connection through a transmission belt. The waste sand magnetic separation device for casting is simple in structure, convenient to use and practical, large caked waste sand and iron blocks are blocked and screened out through the dispersing and screening device, meanwhile, the accumulated waste sand is dispersed, the situation that the iron removal effect is reduced due to accumulation of the waste sand is avoided, and the purpose of reducing the loss of a pulverizer is achieved.

An integrated sand suction system and its control method, belonging to the field of electrical control, is disclosed to solve the problem of the inability to coordinate sand recovery and screening. The system includes a fan, a filtration mechanism, a pulse valve, a screening mechanism, a sand storage mechanism, and a control mechanism to achieve the recovery and screening of molding sand. The fan, screening mechanism, pulse valve, and sand storage mechanism are electrically connected to the control mechanism. The sand storage mechanism is connected to the screening mechanism via a sand storage pipe. The fan is connected to the filtration mechanism via a negative pressure interface, providing negative pressure to the filtration mechanism to draw the molding sand through the filtration mechanism into the sand storage mechanism. This invention achieves integrated operation of molding sand recovery and screening, and the pulse valve promptly cleans the fan's sand suction pipe, enabling smooth operation over extended periods and improving the fan's normal operating time and efficiency.

The application discloses a kind of easy to collapse low gas film-coated sand and preparation method thereof, to solve the problem of large gas emission, difficult to collapse, easy to stick sand and difficult to consider strength of traditional film-coated sand.The film-coated sand is composed of sand particles, gradient crosslinking resin film and core-shell-shell three-layer multifunctional microcapsules;Gradient resin film realizes normal temperature strong and tough, high temperature impact resistance, temperature self-bond breaking and collapse, three-layer microcapsules have in-situ gas capture, flame-retardant and smoke suppression, anti-sticking function.Preparation uses two-stage film-coating process, compatible with existing production line.The film-coated sand has gas emission of 8-12 mL / g, collapse rate ≥95%, sand sticking rate 0.1%-0.5%, normal temperature tensile strength 3.5-4.5 MPa, excellent comprehensive performance and strong practicality.

The application discloses a kind of resin sand with resin and curing agent pneumatic quantitative filling system, comprising: raw material storage monitoring unit, filling control unit, parameter monitoring unit and central control unit;The raw material storage monitoring unit is used to store resin raw materials and curing agent raw materials and collect two kinds of raw material initial state data;The filling control unit is based on adaptive pneumatic pulse frequency spectrum regulation and control to realize raw material synchronous filling, and the application relates to the technical field of resin sand manufacturing.This kind of resin sand with resin and curing agent pneumatic quantitative filling system reaches through adaptive pneumatic pulse frequency spectrum regulation and control technology, can accurately synchronize the filling of resin and curing agent, ensures the accurate control of filling amount, avoids the deviation problem existing in traditional filling mode, through secondary parameter calibration function, after filling is completed, according to the deviation between actual filling amount and preset filling amount, accurate adjustment and optimization are carried out, to further improve the accuracy and stability of subsequent filling.

The present application relates to the technical field of casting, and discloses a vertical sand-burning furnace, which is divided into a buffer area, a sand-burning area and a cooling area in the hearth. The buffer area is connected with an inlet station, and the cooling area is connected with an outlet station. A movable ring chain is arranged in the hearth, and a bracket for storing sand bags or castings is hung on the ring chain. The bracket is driven by the ring chain to circulate through the buffer area, the sand-burning area and the cooling area in sequence, so that the continuous production of castings is realized. The sand-burning area comprises a plurality of sand-burning stations, and the cooling area comprises a plurality of cooling stations. The sand bags loaded on the bracket pass through the plurality of sand-burning stations in the sand-burning area and the plurality of cooling stations in the cooling area in sequence. The sand bags are heated once, and the quality of the castings is good, and the production capacity is high. In addition, when the sand bags are lifted in the sand-burning area by the ring chain, the residual sand of the sand bags on the upper layer has a certain heat, which can preheat the sand bags on the lower layer and flush away the residual sand on the surface of the sand bags, so that the heating time of the sand bags is shortened, and the heat energy utilization rate is improved.

The utility model discloses casting sand molding device of casting of axle housing for vehicle, including corresponding upper and lower sand storage box and sand box that set, sand storage box bottom end is provided with shakeout pipe, still include auxiliary assembly, the auxiliary assembly includes the filter screen box of setting between sand storage box and sand box and being located sand box opening, the opening of filter screen box and the position of corresponding shakeout pipe is provided with a set of guide plate no.

This utility model discloses a mixing device for easy discharge of molding sand powder, relating to the field of molding sand powder processing technology. The mixing device includes a tank, auger blades, and a linkage lifting structure. A cylindrical body is fixedly installed at the bottom of the tank, a circular groove is fixedly installed on the right side of the tank, and a shell is fixedly installed at the top of the tank. A vertical rod is rotatably installed on the inner wall of the cylindrical body, extending into the interior of the tank. A mixing arm is fixedly installed on the outer wall of the vertical rod. Two sets of auger blades are disposed inside the cylindrical body, arranged left and right. The linkage lifting structure is disposed on the cylindrical body, vertical rod, shell, and circular groove. This mixing device for easy discharge of molding sand powder ensures that the molding sand powder at the bottom is fully mixed, improving the quality and efficiency of mixing. It also accelerates the discharge of molding sand powder, preventing blockages during the discharge process and enhancing the practicality of the device.

This utility model provides a sand mixing device for a sand mixer, including a cylinder, a mixing shaft, and mixing blades. The mixing shaft is located inside the cylinder and rotatably connected to it. Multiple mixing blades are evenly arranged along the outer circumference of the mixing shaft. The inner ends of the mixing blades are detachably connected to the mixing shaft and mounted on it. The outer ends of the mixing blades are equipped with scrapers, which are inclined and fit against the inner wall and bottom surface of the cylinder. The mixing blades of this utility model have a split, detachable structure, facilitating later maintenance and reducing manufacturing costs. Furthermore, the multiple mixing blades working in conjunction with the scrapers improve sand mixing, resulting in more efficient sand turbulence, uniform mixing, good mixing effect, and stable and reliable quality of the mixed molding sand.

This utility model belongs to the field of sand mixing technology for casting processing, specifically a sand mixing device for casting processing. It includes a support frame, within which a mixing box is fixedly connected. The mixing box contains a crushing mechanism and a mixing mechanism. The crushing mechanism includes two crushing rollers, which are mounted in the mixing box via rotating shafts. A first gear and a second gear are respectively fitted onto one end of each shaft, and the first and second gears mesh with each other. A first motor is mounted on one side wall of the mixing box away from the first gear, and the output end of the first motor is connected to one end of one of the rotating shafts. A protective cover is mounted on the other side wall of the mixing box. This utility model employs a method of crushing first and then mixing, which allows the sand and gravel raw materials to be evenly distributed with other raw materials, forming stable molding sand, thus helping to improve the dimensional accuracy and processing quality of castings.