139 results about "Dry sand" patented technology

The invention discloses a vacuum negative pressure vibration assisted precision casting forming method. The method comprises the steps of model preparation, sand box and dry sand pretreatment, layered vibration sand filling, film covering vacuumizing, molten metal smelting and purification treatment, negative pressure vibration pouring, pressure maintaining solidification, segmented temperature control and pressure relief box opening and multi-stage cleaning aftertreatment. The core of the method is that mechanical vibration and a vacuum negative pressure technology are deeply coordinated and penetrate through the whole process of modeling, pouring and solidification, and meanwhile, a series of fine control means such as dry sand accurate pretreatment, molten metal rotary blowing degassing and instantaneous inoculation, stepped negative pressure control, temperature-related segmented pressure relief and two-stage shot blasting cleaning are matched; through dynamic cooperation of vibration and negative pressure, the sand mold compaction uniformity, the molten metal mold filling capacity and the solidification feeding effect are remarkably improved, the casting defects of air holes, shrinkage porosity, insufficient pouring and the like are effectively reduced, and the internal density, the size precision and the surface quality of a casting can be remarkably improved.

This invention discloses a continuous, high-efficiency, automatic dry-mixed mortar preparation equipment, relating to the field of mortar preparation technology. It includes a sand drying device and a feeding hopper. A sand particle screen is installed on one side of the sand drying device, and a screw conveyor connects the sand drying device and the sand particle screen. The dried sand enters the sand particle screen via the screw conveyor. Under the action of a first and second uniform material assembly, the mortar on the first conveyor belt consists of coarse sand, fine sand, cement, and filler laid out in sequence. Because the fine sand can fill the gaps in the coarse sand, reducing the relative movement space of the coarse sand and increasing internal friction, the cement and filler can be positioned on top of the coarse and fine sand. The dry-mixed mortar is stacked in a layered structure in a packaging bag using an anti-segregation telescopic tube, reducing stratification during bagging and transportation after mortar preparation, and reducing the mixing time between the mortar and water in the later stages.

The utility model discloses a dry-method gravel processing and desilting system, which relates to the field of gravel processing and desilting, and comprises a coarse crushing workshop and a semi-finished product bin, and the coarse crushing workshop is provided with a material inlet; the heavy plate feeder is arranged at one end, close to the material inlet, in the coarse crushing workshop, and heavy plate feeder striker plates are arranged on the two sides of the heavy plate feeder; and the multiple mud brushing units are arranged on the two baffle plates of the heavy plate feeder correspondingly and used for removing mud from the passing sand and stones. According to the scheme, the desilting effect on gravel is good, water washing is not needed in the desilting process, meanwhile, the gravel can be rapidly air-dried, soil on the surface of the gravel is cleaned through a material brush, soil on the gravel conveyed to a roller screen is further screened out through the roller screen, and the desilting effect is enhanced; and a plurality of roller screen compressed air nozzles are arranged, so that the surface of the gravel can be further subjected to mud removal in the mud screening process.

The invention relates to the technical field of plant desertification control, in particular to a method for plant desertification control in an arid region, and aims to solve the problems that an existing irrigation technology is high in planting cost and difficult to implement in a region without water source guarantee. S2, sowing the treated seeds in a matrix bag; s3, fixing the sown matrix bag in a pipe, and placing the pipe in a soil pit to cultivate matrix seedlings; s4, preparing a water-retaining root-promoting bag; s5, digging a planting pit in the target planting field, placing a water-retaining root-promoting bag at the bottom of the pit, and filling dry sand with a preset height; and S6, transplanting the bred substrate seedlings and the non-woven fabric bags into the planting pits. And a protective net for preventing the wild animals from gnawing can also be bound. The method is used for planting and desertification control, irrigation and additional management are not needed, the investment of laying drip irrigation belts in the later period is reduced, and the method is more suitable for areas without water resource guarantee, is more suitable for desert highway and railway slope protection, and is particularly suitable for being applied to the two sides of an oil field connecting line (a simple road).

The invention relates to the technical field of full mold casting, and provides an evanescent mode dry sand negative pressure molding process, EPS particles are doped with nanometer silane modified silicon dioxide with the mass percentage being 0.5% of that of the EPS particles, so that the strength of a foam model is improved by 20%, the heat deformation temperature is increased to 80 DEG C, and deformation in the molding and pouring process is reduced. The coating of the bottom layer of the model adopts 20% of bauxite and 5% of carbon fibers to be matched with a water-based binder, so that the air permeability is enhanced, and the coating of the surface layer of the model adopts 60% of emery and 10% of silica powder to be matched with a water-based binder, so that the fire resistance is improved. Pre-jolt ramming and main jolt ramming are carried out after sand filling, so that the compactness uniformity of dry sand is improved to 95% or above; sealing is carried out, main vacuumizing and auxiliary vacuumizing are carried out, the vacuum degree sealing performance during pouring is guaranteed, then pouring forming is carried out, and the vacuum degree is monitored in the pouring process, so that the stability of the vacuum degree in the pouring process is guaranteed; and finally cooling and releasing negative pressure to obtain the casting.

The invention relates to the technical field of evanescent mode casting, and discloses an evanescent mode casting process which comprises the following steps: adopting a closed pouring system; setting a pouring temperature; a bottom pouring type pouring system is adopted; a furan resin self-hardening sand core is embedded in the part difficult to fill sand, after a process hole with the diameter smaller than or equal to 50 mm is formed, filling is conducted through an EPS block, sealing is conducted through a high-temperature-resistant adhesive tape, and compaction is assisted through vibration compaction equipment during sand filling; through multi-process collaborative optimization, a full-process controllable lost foam casting system is constructed, the casting density is improved compared with a traditional process, and the tensile strength is improved; the rejection rate is greatly reduced, and the production cycle is obviously shortened; and the dry sand recycling rate is high, and the comprehensive cost is reduced. According to the technical scheme, the problems of discontinuous mold filling, gas retention, dry sand collapse and the like in lost foam casting are solved, and a standardized solution is provided for industrial production of high-end castings.

The utility model relates to an evanescent mode capable of flexibly replacing a product production date. The evanescent mode comprises a sand box, the evanescent mode body is made of a foam material and is arranged in the sand box; wherein a replaceable sheet body is arranged on the outer surface of the evanescent mode body, and a raised first digital mark is arranged on the outer surface of the sheet body; the production gas which is originally printed with years, months and days on the evanescent mode is printed on the sheet body, the sheet body is matched with the evanescent mode body, and the first digital mark protrudes out of the sheet body, so that a cavity for molten metal pouring is formed in the dry sand, and the foamed evanescent mode body and the sheet body are melted together during pouring molding, so that the molten metal is formed. The date of the day is displayed on a casting body after casting molding; and the sheet body can be stamped according to the date of the day to form the first digital mark, so that flexible replacement of the production date on the evanescent mode is realized, and waste of the evanescent mode body is avoided.

The embodiment of the application provides a machine tool base, which comprises a base shell and resin concrete filled into the base shell, the resin concrete comprises raw materials with the following mass percentages: aggregate 70%-85%, filler 5%-15%, and cementing material 5%-20%, wherein the aggregate comprises dry sand and stone, the dry sand accounts for 10%-20% of the total mass of the aggregate, the stone accounts for 80%-90% of the total mass of the aggregate, the stone comprises at least three kinds of stone with different particle sizes, the dry sand comprises: dry sand with a particle size of 0.074-0.106 mm, accounting for 72%-78% of the total mass of the dry sand; dry sand with a particle size of 0.053-0.074 mm, accounting for 20%-25% of the total mass of the dry sand; and dry sand with a particle size less than 0.053 mm, accounting for 1%-3% of the total mass of the dry sand. The machine tool base manufactured by the scheme of the application can greatly improve the compressive strength of the machine tool base.

The invention provides a soil improvement material for ecologically restoring difficult site conditions and a preparation method and application thereof.The soil improvement material capable of being used for plant planting comprises a slow-release capsule coating body, the slow-release capsule coating body is composed of three layers of capsules which are coaxially arranged at intervals, an inner cavity of the inner layer capsule is filled with a fiber drying agent, and the inner layer capsule is filled with a fiber drying agent; a composite material capable of exploding after absorbing soil moisture is filled between the inner-layer capsule and the middle-layer capsule, and dry sand grains are filled between the middle-layer capsule and the outer-layer capsule; the preparation method comprises the following steps: rolling a fiber drying sheet into a solid cylinder structure with a set diameter, tightening the solid cylinder structure with plant fibers to obtain a roll-type plant fiber drying agent, then loading the roll-type plant fiber drying agent into an inner-layer capsule, sealing the inner-layer capsule, and then coating the inner-layer capsule with a composite material and dry sand grains. The soil conditioner can be used for soil improvement in an area with a deep soil layer, and the air permeability and the loose state of the soil can be kept for a long time.

The invention relates to the technical field of building materials, and particularly discloses a special adhesive for internal and external wall flexible tiles and a preparation method thereof. The special glue comprises the following components in parts by weight: 30-50 parts of cement, 60-100 parts of dry sand, 5-10 parts of epoxy resin, 0.05-0.1 part of a curing agent, 1-3 parts of redispersible latex powder, 0.3-1 part of hydroxymethyl cellulose, 1-5 parts of alkenyl silane succinic anhydride and 20-30 parts of water. The special adhesive provided by the invention is suitable for adhesion between organic flexible tiles and inner and outer wall surfaces, especially flexible tiles manufactured by taking organic silicon as a modifier or a binder, and the adhesion strength between the flexible tiles and the inner and outer wall surfaces can be effectively improved.

The utility model discloses a sand drying machine which comprises a drying furnace body, a smoke discharging cylinder is arranged above the drying furnace body, a furnace door is arranged on the front side of the drying furnace body, a firewood opening is formed in the furnace door, an ash receiving box is arranged in the lower portion of the drying furnace body, and a stirring assembly used for flattening combustion ash is arranged in the ash receiving box. A roller is installed in the drying furnace body, a transmission shaft is fixed to one end of the roller and penetrates through a furnace body of the drying furnace body to be connected with a speed reducer unit, the speed reducer unit is driven by a driving motor through a belt, and a material guide opening is formed in the other end of the roller and penetrates through the furnace body of the drying furnace body to be movably in butt joint with a material guide bin. According to the sand drying machine, the rotary drum is arranged in the drying furnace body, meanwhile, the combustion frame is further arranged in the drying furnace body, the drum can be heated by combusting materials so that sand in the drum can be rapidly dried, and therefore it is guaranteed that the amount of dry sand used in the anchoring material preparation process is sufficient.

The application belongs to the technical field of bimetal castings, and discloses a device and method for magnetic field assisted lost foam casting of magnesium-aluminum bimetal castings. The device comprises a sand box, a cast foam pattern, a solid insert, a steady magnetic field coil, a rotating magnetic field coil and an alternating current power supply. The sand box is filled with dry sand, the cast foam pattern is arranged in the dry sand, the solid insert is embedded in the cast foam pattern, and the opposite ends of the solid insert are connected to the alternating current power supply. The steady magnetic field coil is sleeved outside the cast foam pattern, and the rotating magnetic field coil is sleeved outside the periphery of the steady magnetic field coil. The rotating magnetic field coil can produce electromagnetic stirring in the melt. The electromagnetic stirring can make the melt flow strongly, promote the migration and diffusion of high melting point precipitated phases in the melt, and thus improve the uniformity of the solidification structure of the magnesium-aluminum bimetal interface.

The utility model discloses a placer dry separation and dust removal device, which relates to the technical field of dust removal and comprises a dry separation component and a dust removal component. According to the technical scheme, airflow with raised dust at the dry separation part and the feeding port is conveyed into the multiple dust removal cavities through the pipeline set and filtered by the multiple filtering parts, so that dust removal operation is carried out, and when a certain dust removal cavity and the filtering part in the dust removal cavity need to be cleaned, the dust removal cavity and the filtering part in the dust removal cavity are cleaned by rotating the partition plate. Flying dust attached to the cavity wall of the dust removal cavity is scraped through rotation of the partition plate, and after the partition plate is driven to rotate to seal the dust removal cavity, the filtering part is convenient to replace or clean, so that cleaning of a certain dust removal cavity and the filtering part can be achieved, and normal dust removal of the dry separation part and the feeding port is not affected; and the partition plate is rotated again to facilitate dust removal operation again, so that the dust removal quality and the dust removal efficiency are improved.

The present invention relates to the technical field of construction machinery, and discloses a production control method, a processor and a production device for manufactured sand. The method includes: obtaining a model relationship of the water addition flow rate, the moisture content of the finished wet sand, and the real-time effective power when the crusher is working under load; determining the real-time effective power when the crusher is working under load; receiving the set moisture content; determining the real-time flow rate of water addition according to the real-time effective power, the set moisture content and the model relationship; adding water to the finished dry sand based on the real-time flow rate to make the finished wet sand of manufactured sand. By detecting the real-time effective power of the crusher, the flow value of the finished dry sand is sensed in real time, and combined with the set moisture content, the actual required water addition flow rate is accurately calculated. The real-time flow rate of water addition is adjusted in real time according to the real-time effective power of the crusher and the required moisture content, so that the actual moisture content of the finally produced finished wet sand more conforms to the demand setting, and for the control of the moisture content, the accuracy is higher and more stable.

The utility model discloses a dry state sand shoots sand leakage prevention automatic plugging device, including sand shooting board, a plurality of shoots are fixedly arranged on sand shooting board, sand shooting board top is provided with sand baffle, sand baffle is fixedly connected sand baffle column, sand baffle top is fixedly connected jacks, and jacks lower extreme extends to the downside of sand shooting board, and the upside of sand shooting board is fixedly provided with reset rod, and spring connection sand baffle is seted up on reset rod, and sand baffle is pressed under the action of spring force and makes sand baffle column to press tightly the sand outlet of shoot, and when shooting, the upside of upper core box abuts against the lower extreme of jacks, makes sand baffle and sand baffle column synchronous up -and -down open the sand outlet of shoot. The device utilizes jacks and upper core box linkage control sand baffle's lifting action, and sand baffle column falls back automatically after shooting, and tightly closes shoot, prevents sand from continuing to leak effectively, improves the on -the -spot cleanliness and equipment life.

The invention belongs to the technical field of material separation, and particularly discloses a dry sand powder grading separation system. Comprising a feeding mechanism, a first-stage sand powder separation tower, a second-stage fine powder classifier, a negative pressure dust collector, an air distribution plate, a through hole, an air inlet, a conical barrel, an inverted conical barrel, a fine powder and air mixing outlet, a feeding pipe, a buffer stock bin, a feeding valve, a first discharging opening, a first discharging valve, a second discharging opening and a second discharging valve. Compared with the prior art, a special air blower is not needed, negative pressure is formed in the whole system only through the induced draft fan of the negative pressure dust collector, dry sand fine powder can be graded and separated, and finished products of different grades are obtained after separation.

The invention belongs to the technical field of evanescent mode casting, and particularly discloses an evanescent mode casting automatic bottom shakeout special sand box device which comprises a sand box body used for containing an evanescent mode and shakeout and used for evanescent mode casting. The transportation frame is placed at the bottom of the sand box body and used for driving the sand box body to move; the sand shakeout component comprises two turning plates, the number of the turning plates is two, the two turning plates are oppositely arranged, the outer side ends of the turning plates are rotationally connected with the inner rod in a sleeving mode, and the turning plates are located in the leakage groove. The sliding rod is fixed to the bottom of the turning plate. The inserting rods move at the bottoms of the sliding rods through movement of the pulling plates, the sliding rods are limited through the inserting rods with different heights, and therefore the inclination angle of the turning plate in the leakage groove is limited, simple sand shakeout of the sand box body is guaranteed, the speed of dry sand falling in the leakage groove and the through groove can be adjusted and controlled, and the production efficiency is improved. And the phenomenon that dry sand with high heat is scattered on the body of a worker due to the too high sand shakeout speed is avoided.

The application discloses a magnesium alloy anti-oxidation heat treatment process, and particularly relates to the technical field of metal material heat treatment. The process comprises the following steps: mixing dry sand with a specific proportion of composite flame retardant to prepare a flame-retardant sand mold mixture; placing a magnesium alloy casting in a heat-resistant container, completely covering and vibrating the magnesium alloy casting with the mixture; and then performing programmed heat treatment in a conventional heat treatment furnace. During the high-temperature holding stage, the mixture is subjected to controllable sintering hardening, and the formed hardened sand body forms a protective layer on the surface of the casting to isolate oxidation through the synergistic effect of fluorine, sulfur, boron and other components in the sand body; on the other hand, the hardened sand body provides rigid physical support for the casting in a high-temperature softened state to prevent deformation. After the heat treatment is completed, the casting and the sand mold are separated through vibration. The process has the advantages of reliable anti-oxidation, effective anti-deformation, low cost and compatibility with conventional equipment, and is suitable for the heat treatment of magnesium alloy castings such as ZM5 and ZM6.

A method for manufacturing graphene aluminum casting where special sand boxes are used together with vacuum evacuation to harden dry sand between two pieces of EVA film, thereby producing an upper mold box and a lower mold box for aluminum casting. The molten aluminum used to cast a graphene aluminum casting is evenly mixed with graphene powder, so there is a certain proportion of graphene inside the graphene aluminum casting. And because there is a thin layer of graphene powder on the surface of one of the EVA films, these graphene powder will adhere to the surface of the graphene aluminum casting without falling off.

The utility model relates to the technical field of lost foam casting, in particular to a jolt ramming mechanism and a lost foam casting device.The jolt ramming mechanism comprises a vibrating mechanism, a plurality of vibrating motors are arranged on the outer wall of the vibrating mechanism, and a sand box is arranged above the vibrating mechanism; a plurality of supporting rods are arranged on the surface of the stabilizing plate, and damping springs are arranged above the supporting rods; the device has the beneficial effects that the vibration motors mounted on the outer wall of the vibration mechanism can be started and mounted on the front portion, the rear portion, the left portion, the right portion and the lower portion of the vibration mechanism, so that the vibration motors can apply up-down, left-right and front-back three-dimensional vibration to the sand box, dry sand can flow and be compacted more sufficiently under the three-dimensional vibration, all parts of a model can be better filled, and the sand box is more compact. The filling performance and density of the dry sand are improved, the casting defects are effectively prevented, meanwhile, the damping springs play a role in buffering vibration, the influence of vibration on the surrounding environment and equipment is reduced, and therefore the problems that the filling density of molding sand in the sand box is not uniform, and the casting quality is influenced are solved.

This utility model relates to the field of beach cleaning technology, and in particular to a beach garbage cleaning vehicle. The vehicle includes a structural frame and, sequentially, a sand-lifting component, a transport component, a separation component, and a storage component installed on its top surface. The sand-lifting component scoops up a first mixture containing garbage and sand from the beach and delivers it to the transport component. The transport component conveys the first mixture to the separation component. The separation component includes a first separation assembly, a drying assembly, and a second separation assembly. The first separation assembly receives the mixture, separates the outer layer of dry sand, and then delivers the second mixture containing the inner layer of wet sand and garbage to the second separation assembly. The drying assembly dries the inner layer of wet sand during the first separation process, transforming it into easily separable dry sand, and separates a portion of the dried inner layer of wet sand through the first separation assembly. The second separation assembly further separates the dried inner layer of wet sand and delivers the separated garbage to the storage component for storage, thereby reducing the sand content of the garbage.

The utility model relates to a railway internal combustion locomotive sand feeding device which comprises an electric flat car, a lifting platform, a sand hopper containing dry sand and a sand outlet pipe used for enabling the dry sand to flow out, the lifting platform is arranged above the electric flat car, the sand hopper is arranged above the lifting platform, and adjustment of the height position of the sand hopper can be conveniently achieved. The lower portion of the sand hopper is of an inverted-cone-shaped structure, dry sand can be conveniently gathered, a vibration motor is arranged below the sand hopper, the lower portion of the sand hopper is communicated with a sand outlet pipe, and the sand outlet pipe obliquely extends downwards to the front portion of the electric flat car. The sand outlet pipe comprises a metal hard pipe, a plastic hose and an opening and closing assembly used for controlling on-off of the metal hard pipe, one end of the metal hard pipe is communicated with the sand hopper, the other end of the metal hard pipe is communicated with the plastic hose, and the metal hard pipe is further provided with the opening and closing assembly. The sand feeding device is used for carrying out sand feeding operation on the locomotive, operation is simple, use is convenient, the sand feeding task can be completed by one person instead of being completed by two persons in the past, and the using effect in the aspect of sand feeding of the diesel locomotive is good.

The application discloses an aerated concrete block cured by cement kiln tail flue gas and a preparation method thereof, and belongs to the technical field of concrete materials. The aerated concrete block comprises 20-30 parts of carbon-fixing cementitious material, 30-40 parts of dry sand, 1-5 parts of heavy calcium powder, 0-5 parts of dihydrate gypsum and 35-45 parts of water. The preparation method comprises the steps of batching, stirring and pouring, static stopping, cutting and curing. The application is scientific and reasonable in design and convenient to use. The carbon-fixing cementitious material is used to prepare the aerated concrete, and the aerated concrete is cured by the cement kiln tail flue gas. The alkaline mineral in the aerated concrete can quickly react with the acid gas in the flue gas, the hydration-heat combination-acidification ternary reaction of the aerated concrete body is realized, the strength of the aerated concrete is quickly improved, and energy saving and emission reduction are truly realized.

The application relates to the technical field of building gypsum, and discloses a composite gypsum-based self-leveling mortar and a preparation method thereof, which comprises phosphorus building gypsum, a composite additive and auxiliary materials; according to the mass fraction, the composite additive comprises 0.05-0.3% of a reinforcing agent, 0.02-0.2% of a defoaming agent, 0.03-0.2% of a gypsum retarder, 0.02-0.2% of a stabilizer, 0.01-0.1% of a toning agent and 0.05-0.4% of a flow aid; the auxiliary materials comprise 2-20% of dried sand, 0.01-0.5% of calcium oxide, 0.1-2% of calcium carbonate, 1-6.5% of ceramic microspheres and 0.1-0.5% of anti-cracking fibers; and the balance is phosphorus building gypsum. The application controls the types and dosages of the raw material components of the gypsum-based self-leveling mortar, so that the components can be combined with each other; and the material performance defects of the current self-leveling mortar taking phosphorus building gypsum as the main gel material, such as low strength, easy cracking and poor fluidity, can be solved.

The utility model discloses a multifunctional adjustable dry sand box for a 3D printing sand mold. The multifunctional adjustable dry sand box comprises a bottom plate, a pair of L-shaped baffles, a cover plate and a limiting assembly. The bottom plate is rectangular, the baffles are spliced into a rectangular fence through screws and installed on the bottom plate, and triangular reinforcing blocks are arranged on the inner sides of the baffles to enhance rigidity. The cover plate is detachably installed on the fence, and the cover plate, the bottom plate and the fence jointly form the dry sand box. The limiting assemblies are arranged in the dry sand box in an array mode and used for limiting the sand mold, and the position precision of the sand mold in the 3D printing process is ensured. And the baffle is provided with the turnup and is detachably connected with the cover plate, the bottom plate and the other baffle through the mounting holes, so that the structural stability is enhanced. A round hole is formed in the middle of the bottom plate so that liquid alloy can be conveniently injected into a sand mold. Supporting strips and lifting handles are arranged on the outer sides of the baffles, and carrying and operation are convenient. Through the detachable structure and the adjustable limiting assembly, the device is suitable for sand molds with different sizes, the part taking process is simplified, the production efficiency is improved, and the maintenance cost is reduced.

The utility model discloses a dry sand screening machine, which relates to the technical field of screening machine equipment and comprises an outer barrel, a plurality of groups of first connecting blocks are fixedly mounted on the outer side of the outer barrel, a base is fixedly connected to the inner sides of the first connecting blocks, a first discharge pipe is mounted on one side of a first screening disc, and a second discharge pipe is mounted on one side of a second screening disc. The bottom of the collecting hopper is connected with a third discharging pipe, and the first screening disc filtering holes are larger than the second screening disc filtering holes. According to the utility model, through the reciprocating rotary motion of the first screening disc and the second screening disc, the motion range of dry sand on the screening surface is expanded, so that the dry sand can be distributed more uniformly, local accumulation is avoided, and the screening comprehensiveness is improved; and in cooperation with a transmission structure of a gear ring and a driving gear, a spring can guarantee the stability and the buffering effect of the structure, the first screening disc, the second screening disc and the collecting hopper are provided with a first discharging pipe, a second discharging pipe and a third discharging pipe correspondingly, dry sand with different particle sizes can be collected and discharged conveniently, and convenience of follow-up treatment is improved.

This invention discloses an automatic mortar proportioning and stabilization mixing control method based on online moisture content detection, relating to the field of mortar production and proportioning control technology. The method first performs online moisture content detection on the wet sand entering the mixing system. Based on the real-time moisture content data, the wet sand feed amount is converted into an absolute dry sand baseline amount, and the target total water consumption, the initial planned water addition, and the reserved correction water amount are determined in conjunction with a preset mortar masterbatch formula. Then, the first water addition and mixing are performed. During the initial discharge stage, the state parameters of the first wave of material are collected within a preset first-wave material verification window and compared with a preset target range. When the state parameters of the first wave of material are lower than the preset target range, a limited secondary water addition is performed, and mixing continues until the stabilization endpoint is reached, at which point the finished mortar is output. This invention can improve the mortar proportioning accuracy, discharge continuity, and batch consistency under fluctuating wet sand conditions.

The invention provides a spraying device for a nozzle of a core making machine and the core making machine, and relates to the technical field of core making machines. The spraying device for the nozzle of the core making machine comprises a cooling liquid source, a spraying assembly and a control assembly, the spraying assembly comprises a liquid inlet and a spraying opening, the liquid inlet is communicated with a cooling liquid outlet in the cooling liquid source, the spraying opening is arranged to face a nozzle of the core making machine, and the spraying assembly is used for receiving cooling liquid from the cooling liquid source and spraying the cooling liquid to the nozzle through the spraying opening; the control assembly is used for controlling the circulation state and flow of the cooling liquid between the cooling liquid source and the spraying assembly. According to the spraying device for the nozzle of the core making machine, cooling liquid is directly sprayed to the nozzle through the spraying assembly, the condensation effect of the cooling liquid on the nozzle can be effectively improved, the sand drying phenomenon at the head of the nozzle is reduced, meanwhile, the spraying duration and the spraying amount of the cooling liquid can be adjusted through the control assembly, and the spraying efficiency is improved. And the condensation lifting effect of the spraying assembly on the nozzle is further effectively ensured.

The invention relates to the technical field of sand making, in particular to a fine crushing and shaping device for a dry-method sand making machine. According to the technical scheme, the machine comprises a machine frame, wherein a shaping cavity and a discharging opening located below the shaping cavity are formed in the machine frame; the driving device is mounted on the rack; the shaping assembly is rotatably arranged in the shaping cavity, is in transmission connection with the driving device and is used for crushing and shaping the materials through rotation; the adjustable feeding mechanism is arranged above the shaping assembly, located in the shaping cavity and used for guiding materials to the shaping assembly; wherein the adjustable feeding mechanism is in transmission connection with the shaping assembly, and the adjustable feeding mechanism is constructed to be capable of adaptively adjusting the amount of materials passing through the shaping assembly in unit time according to the rotating state of the shaping assembly. Cooperative regulation and control of feeding and shaping are achieved through the linkage structure, material blocking and idling are avoided, the sand making efficiency and the finished product quality are improved, and energy consumption and operation and maintenance cost are reduced.

The present invention relates to a high-strength and heat-resistant regenerated sand, a preparation method thereof, and an application in a cold-box process. The method comprises the following steps: crushing and screening old sand from a wet mold to obtain coarse-treated old sand; sequentially roasting, wet-purifying, and separating sand and water from the coarse-treated old sand to obtain dry sand; sequentially grinding and screening the dry sand, and then adding water glass for stirring and mixing to obtain modified sand; and rotating and curing the modified sand to obtain the high-strength and heat-resistant regenerated sand. The method involves multiple regeneration processes using thermal, wet, and mechanical methods, and then coating and modifying the surface of the regenerated sand to obtain modified regenerated sand with a smooth surface and excellent high-temperature resistance. The sand core prepared using the modified regenerated sand in the cold-box process has the advantages of high strength and a dense surface, thereby solving the problem of solid waste of old sand in foundries; saving non-renewable silica sand resources, and developing a resource recycling economy; and producing a high-quality regenerated sand that can prepare high-quality casting sand cores and improve the quality of castings.