2270results about "Mould handling/dressing devices" patented technology

The invention provides a chemical regeneration method in the casting waste sand disposing process, relating to a process for performing surface chemical processing on various impurities which are attached on the surface of waste sand and are better not be reused in casting-form sand materials. During the chemical regeneration, chemical surface conditioning liquid I or/and chemical surface conditioning liquid II is or are used, and the disposing sand temperature is not more than 400 DEG C. The chemical regeneration method in the invention is carried out before or after the hot-method regeneration disposing or mechanical regeneration disposing of the casting waste sand disposing processing, and the chemical disposing technique is combined with the traditional hot-method regeneration and mechanical friction regeneration. The regeneration new sand formed in the method has better quality of the new sand, can better meet the application requirement on multi-form sand producing technique (hot core box, warm core box and cold core box) for recycling different casting waste sands (hot core box resin casting waste sand, warm core box resin casting waste sand, gas or/and organic fat hardening cold core box resin casting waste sand and profile damp die casting sand), and has better economical efficiency.

The invention discloses a rapid manufacturing method for sprayed and cured molding sand. The rapid manufacturing method is characterized by comprising the following steps: molding sand is mixed with a curing agent in advance, and diluted resin is sprayed onto the molding sand mixed with the curing agent through a spray; through powder layering and resin spraying, the molding sand with sprayed resin is cured, and then adhesive forming is realized; the formed layers are heated for drying; the entity of a casting mold is formed through layer-by-layer printing, stacking and curing, and then the strength of the casting mold is improved through further drying. Through adoption of the rapid manufacturing method, the problem that the amount of gas evolution of the casting mold is overlarge can be solved through reduction of the resin consumption, the spray is protected from blockage, the curing speed is increased, the assembly quality of the casting mold and a mold core is improved, and finally the casting mold with relatively high strength is obtained.

The invention discloses a waste foundry sand regenerating process method, which comprises the processes of crashing and screening, magnetic separation, roasting and graded screening. The roasting process particular comprises the following steps of: preheating waste sand which does not enter a furnace and air for combustion by using the heat of hot sand which is discharged from the furnace; controlling the roasting temperature of a roasting furnace to be between 780 and 850 DEG C by controlling a roasting furnace burner and the flow of the waste sand entering the furnace; separating roasted waste sand from waste gas by using a cyclone dust collector, a spraying dust collector and a bag type dust collector; and exhausting the separated waste gas to the atmosphere after passing through an alkali liquor washing tank and an adsorption tank, wherein the bag type dust collector has a high-pressure air flow blowback control bag dust-removing structure; and the dust-removing process and the normal operation of a system are maintained by controlling the bag dust-removing cycle of the bag type dust collector. Compared with the conventional method, the waste foundry sand regenerating process method has the advantages of greatly reducing energy consumption and guaranteeing the cleaness of the exhausted waste gas.

A process for removing sand cores from metal castings in a continuous or semi-continuous procedure utilizes a fluid bed furnace. The thermally decomposed sand cores are carried away with the fluidized solids of the furnace bed.

A full-automatic reprocessing line of casting-purpose resin sand comprises a shakeout system, a shakeout machine, a suspended magnetic separator, a crusher, a reprocessing machine, a winnower, a double-cavity sand bin, a material mixing hopper, a sand mixer and the like. The reprocessing line of the resin sand is low in production cost, high in recycling efficiency and small in pollution. By the reprocessing line, procedures such as shakeout, crushing, reprocessing, winnowing, temperature control, material mixing, dust removing and the like can be finished automatically. The reprocessing machine is used for reprocessing by unique collision, extrusion and centrifuging ways; little binder is remained on used sand, reprocessed sand is high in quality; because sliding rails are arranged at the bottom of the sand mixer, a plurality of sand molds can be molded conveniently; deformation or damage of the sand mould due to transportation are prevented; and the full-automatic reprocessing line of the casting-purpose resin sand is suitable for large-scale production and has high promotional value.

There are provided a dry aggregate mixture wherein the binder, even when heated, does not evolve unpleasant odor or gas hazardous to human health; a method of foundry molding wherein a space for foundry molding, up to minute portion thereof, can satisfactorily be filled with an aggregate mixture composed of a binder and granular aggregate; and a method of foundry molding wherein the mold used in molding of an aggregate mixture composed of a binder and granular aggregate can retain satisfactory properties even in high humidity. In the method of foundry molding, a mold is formed by the use of a dry mixture obtained by providing an aggregate mixture composed of granular aggregate, a water soluble binder and water and evaporating the water contained in the aggregate mixture through heating, pressure reduction or aeration while mixing so as to effect separation into single granules, or with the addition of a lubricant and a crosslinking agent thereto.

The invention discloses a used sand regeneration method and a used sand regeneration system thereof. The sodium silicate used sand is positioned in a heat flow used sand regeneration machine 1 for being heated and cleaned, an inert membrane at the surface of the used sand is dissolved, the sewage passes through a used sand layer, the fine powder in the sewage is retained in the regeneration sand,and the sodium silicate flows into a storage water tank with water. The regeneration sand is then sent to a dry regeneration machine 18 for dedusting after being sent to a dryer 10 for drying, and then the clean regeneration sand is obtained. Liquid in the storage water tank can be repeatedly reused for cleaning the used sand. When the sodium silicate content is too high to be reused, concentration and recycling can be done to solution. The invention can not only produce the high quality regeneration sand, but also can realize zero discharge of the sewage.

The invention relates to a waste moulding sand or core sand reproducing device, in particular to a boiling fluidizing roasting furnace which comprises a furnace body. The furnace body is internally provided with a distributing heating chamber on the upper part and a roasting heating chamber on the lower part; the wall of the roasting heating chamber is provided with a burner; and the upper part of the distributing heating chamber is provided with a distributing cone. The boiling fluidizing roasting furnace is characterized in that: the bottom of the heating chambers is provided with a heat exchanging area, the burner is arranged above the heat exchanging area, an air collecting chamber with more than one air inlet is fixedly arranged below the furnace body, an air pipe is fixedly arranged on the top wall of the air collecting chamber, the lower end of the air pipe is arranged in the air collecting chamber, and the upper end of the air pipe is arranged in the heat exchanging area and provided with an air hood. The speed of cooling the roasted material is increased under the premise that the energy is fully utilized, so that the work efficiency of the existing waste moulding sand or core sand reproducing device is improved.

The invention relates to waste sand recycling equipment which comprises a vibration crushing screening machine, an old sand lifting machine, a magnetic separation machine, a hot-method regeneration device, a cooling bed, a vibration screen and a new sand lifting machine which are connected in sequence. A use method of the waste sand recycling equipment comprises the following steps of: a, adding waste sand into the vibration crushing screening machine, crushing the waste sand into small particles, feeding the small particles into the old sand lifting machine, conveying the small particles to the magnetic separation machine, and removing iron materials; b, feeding preheated waste sand into the hot-method regeneration device for sintering; c, cooling the high-temperature sintered sand through the cooling bed, feeding the cooled sintered sand into the vibration screen, and enabling the sintered sand to pass through the new sand lifting machine to obtain regenerated sand; d, preparing materials according to the following formula: 1.6-1.7kg of a methenamine solution, 2.7-2.8kg of phenolic resin, 100-300g of calcium stearate, 60-100g of silane and 150kg of the regenerated sand and/or raw sand; e, adding the materials into a stirring kettle in sequence and uniformly stirring to obtain precoated sand. The waste sand recycling equipment has the beneficial effects of simplicity for operation, high old sand recycling rate and simplicity for popularization.

A system and method for heat treating castings and removing sand cores therefrom. The castings are initially located in indexed positions with their x, y, and z coordinates known. The castings are passed through a heat treatment station typically having a series of nozzles mounted in preset positions corresponding to the known indexed positions of the castings passing through the heat treatment station. The nozzles apply fluid to the castings for heat treating the castings and degrading the sand cores for removal from the castings.

The invention discloses a ceramic core for silica sol precision casting and a manufacturing process thereof. Main body components of the ceramic core comprise refined quartz powder and a proper amount of collapsing agent, and the surface of the ceramic core is coated with high-temperature resistant paint with a thickness of 0.1 to 0.2 millimeter; and at the same reasonable manufacturing processes such as mixing, core making and roasting are adopted. In the ceramic core for casting, the unique material mixing and manufacturing processes are adopted, and the reasonable use of the refined quartz powder and the collapsing agent improves the collapsibility of the ceramic core after casting considerably, the high-quality high-temperature resistant material in ingredients enables the core to resist the erosion of high-temperature molten metals, and the high-temperature resistant paint on the surface of the ceramic core not only improves the high temperature resistance during casting, but also increases the cooling speed of the molten metal.

The invention relates to the waste reusing technology, in particular to a precision casting waste sand reusing method. The precision casting waste sand contains mullite, mullite sand, zirconite and zircon sand. The precision casting waste sand is cleaned, dried, crushed and screened to form aggregate and powder for a fireproof casting material; and a bonding agent and an admixture are added into the aggregate and the powder, and the components are mixed and homogenized to form the fireproof casting material. The method solves the problem that the conventional precision casting waste sand pollutes the environment.

The invention discloses easy-to-fill precoated sand and a preparation method thereof. Raw materials comprise roughing sand, phenolic resin, curing agents, lubricating agents and additives. The preparation method comprises the following steps that the roughing sand is heated to 130 to 170 DEG C, then, the phenolic rein, a half quantity of the lubricating agents, the curing agents and the rest half quantity of lubricating agents are sequentially added, finally, the discharging is carried out, and then, crushing, sieving and package are carried out. Through the improvement on the raw material ingredients and the preparation process, the forming intensity of the precoated sand is high, the high-temperature intensity is high, the deformation quantity is small, the flowability is good, complicated sand cores can be produced, the surface smoothness of the molding sand is good, the collapsibility performance is excellent, castings can be easily subjected to the vibration sand falling treatment, the precoated sand gas producing quantity is reduced, and the high-temperature performance and other casting performance of the precoated sand are improved.

Certain embodiments of a melting and casting apparatus comprising includes a melting hearth; a refining hearth fluidly communicating with the melting hearth; a receiving receptacle fluidly communicating with the refining hearth, the receiving receptacle including a first outflow region defining a first molten material pathway, and a second outflow region defining a second molten material pathway; and at least one melting power source oriented to direct energy toward the receiving receptacle and regulate a direction of flow of molten material along the first molten material pathway and the second molten material pathway. Methods for casting a metallic material also are disclosed.

The invention discloses a process for regenerating forced scrubbing water glass used sand through a wet method, which comprises the following steps of: firstly, loading collected old sand into a jaw crusher to perform crushing, and conveying the crushed old sand into a magnetic separator to perform magnetic separation; secondly, putting sand grains after the magnetic separation into a first stage spiral sand-water separator, a first stage wet method regenerator and a second stage spiral sand-water separator to perform sand-water separation on the old sand; thirdly, neutralizing the sand after the separation by a neutralizing sedimentation basin; fourthly, performing sand-water separation for the second time through a second stage wet method regenerator and a third stage spiral sand-water separator to ensure that water glass existing in the old sand can be thoroughly eliminated cleanly; and finally, performing dust elimination and drying to obtain sand grains namely the finished products which are put into a sand storage. The process adopts a device with a simple and novel structure, a compact and reasonable system composition and fewer wear-out parts. The process has a high elimination ratio of Na2O in the old sand, and the regenerated sand is good in quality and can be recycled repeatedly for use; besides, the process has small water consumption, realizes recycling by using water and plays a positive role in protecting the environment.

A foundry used sand wet intermittent regeneration method and equipment thereof belong to a foundry used sand regeneration method and equipment thereof, aim to solve the problem of complicated process and narrow application scope of the conventional foundry used sand wet regeneration method, and further solve the problem of relatively complicated structure of the conventional regeneration equipment. The regeneration method comprises a scrubbing step, a second scrubbing step, a third scrubbing step and a checking step. The regeneration equipment comprises a stirrer and a sand-water separation device, wherein the stirrer comprises a support frame, a scrubbing cylinder, a drive cylinder, a motor and a main shaft, and the scrubbing cylinder is provided with a sand inlet and a water inlet and further provided with a water drainage valve and a sand discharge valve. By integrating the combined actions of mechanical stirring, water washing and acid cleaning, the regeneration method provided bythe invention has the advantages of convenience in control, low water consumption, high residual adhesive removal ratio and good sand regeneration quality; the regeneration equipment has the advantages of simple structure, low energy consumption, convenience in control and good sand regeneration quality; and the regeneration method and equipment are suitable for large-scale wet regeneration of used clay sand, used water glass sand and used alkaline phenolic resin sand.

A digital resin sand regeneration system comprises a vibrating knockout device, a magnetic separation device, a vibrating crushing device, an intermittent grinding regeneration unit, a conveying device, a sand storehouse, a dedusting device, a computer control system, etc. The main working principle is as follows: waste sand blocks are vibrated and crushed into smaller blocks and scattered sand by the knockout device; magnetic separation is performed to remove iron beans and flash; crushing is performed by the crushing device to obtain granular scattered sand; stripping, grading and temperature adjustment are performed by the intermittent grinding regeneration unit to remove micro powder included in the sand, and the sand temperature is adjusted to a temperature required by the process; and the sand is conveyed to the sand storehouse to keep in reserve. Through the additionally installed computer control system which comprises a material level sensor, a temperature sensor, a pressure sensor, and a corresponding electric control component, the whole production line can realize the target control of technological parameters and stock sand amounts; mainly-controlled technological parameters are: stripping rate (loss on ignition, LOI), micro powder content, sand temperature and sand amount; and technical guarantee is provided for the digital production management of the whole factory. Digital control of molding resin amount, hardening stripping time, and sand using amount is basic guarantee for solving energy saving and consumption reduction, improving productivity, and increasing yield.

The invention relates to a regeneration method of casting wet type mixed old sand. The regeneration method comprises the following steps: preprocessing casting wet type mixed old sand; wiping with water; drying; preheating; roasting; and post-processing. In the invention, components, such as bentonite, coal dust and ashes, in wet type old sand are effectively removed by a water wiping process, and a residual resin film in mixed old sand is thoroughly decomposed by a roasting process. The regeneration cost is low, and the regeneration effect is great. Actual production and verification show that the performance indexes of regenerated sand reach or surpass those of new sand. The regeneration method is successively applied to the core making production of cold boxes and has remarkable economical and social benefits.

The invention discloses a method utilizing an ultrasonic technology to regenerate used sodium silicate sand. The method comprises the following steps: soaking used sodium silicate sand in a prepared sodium hydroxide solution, then separating the sodium silicate sand from the sodium hydroxide solution, placing the soaked sodium silicate sand in clean water or an alkali solution with a mass concentration of 0 to 20%; then subjecting the solution to an ultrasonic treatment by ultrasonic waves with a frequency of 20 to 200 kHz, then separating the sodium silicate sand from the waste liquid so as to obtain sodium silicate sand and waste liquid containing waste residues; washing the obtained sodium silicate sand, and drying so as to obtain regenerated sodium silicate sand with a demoulding rate more than 95%. The provided method has the advantages of high regeneration demoulding rate, no pollution, and good usability of regenerated sand.

The invention discloses a preparation method for sodium silicate sand used for casting. The method comprises the steps of preparing modified sodium silicate and preparing molding sand, wherein, the modified sodium silicate is prepared by using a composite modifier which comprises 35 to 50% of talcum powder, 6 to 12% of starch, 14 to 18% of polypropylene glycol and 25 to 35% of nanometer alumina powder on the basis of the total amount of the composite modifier. The molding sand in the invention enhances strength and improves collapsibility of the sodium silicate sand.

The invention discloses a quick cooling device for sand of a lost-foam production line, and relates to a cooling device. The quick cooling device comprises a cooling water tank, sand cooling metal tubes, a sand inlet hopper and a sand outlet hopper; the tank wall, close to the top end, of the cooling water tank is connected with a water outlet tube which extends into the cooling water tan; the tank wall, close to the bottom end, of the cooling water tank is connected with a water inlet tube which extends into the cooling water tank; the sand inlet hopper is connected with the outer surface of the tank wall at the top end of the cooling water tank; the sand outlet hopper is connected with the outer surface of the tank wall at the bottom end of the cooling water tank; the plurality of sand cooling metal tubes are uniformly arranged in the cooling water tank; the top end of each sand cooling metal tube is connected with the tank wall at the top end of the cooling water tank in a sealing manner; the top end of each sand cooling metal tube passes through the tank wall at the top end, and communicates with an inner cavity of the sand inlet hopper; the bottom end of each sand cooling metal tube is connected with the tank wall at the bottom end of the cooling water tank in the sealing manner; and the bottom end of each sand cooling metal tube passes through the tank wall at the bottom end, and communicates with the inner cavity of the sand outlet hopper. The quick cooling device has the advantages of being small in size, simple in structure, good in cooling effect, low in energy consumption, and the like.

The invention relates to a regeneration technology of foundry used sand. The technology comprises the following steps that (1), initial magnetic separation is carried out on broken used sand; (2) the broken used sand obtained after initial magnetic separation is roasted; (3), roasted sand grains are cooled, and under the negative pressure condition, blast grinding is carried out on the sand grains; and (4), the ground sand grains are screened, magnetic separation is carried out again, and regeneration sand is obtained. The quality of the regenerated sand obtained through the technology treatment is further improved, the acid consumption value and the ignition losses of the sand are obviously reduced, the sand grain and the resin coating effect is better, the strength is higher, the pollution of the used sand to the environment is reduced, the cost of core making materials of a casting enterprise is saved, and a hot core box and a cold core box made of original sand can be completely replaced.

The invention relates to foundry machinery, specifically to sand mixing equipment. The sand mixing equipment comprises a cylinder, a rotation shaft, a driving motor, a watering device, a valve device, a sand rolling device, a sand fluffing device, a sand-casting device and a scraper plate. The cylinder is a hollow cylinder structure. The bottom of the cylinder is provided with a fan-shaped opening. A support plate is arranged at the opening. The opening is used for releasing mixed sand. The support plate is provided with through-holes. The rotation shaft is installed at the middle part of the cylinder. The driving motor is positioned below the cylinder. The watering device is positioned above the rotation shaft. The valve device is installed at the bottom of the cylinder. The sand rolling device, the sand fluffing device, the sand-casting device and the scraper plate are uniformly installed on the periphery of the rotation shaft. The scraper plate is positioned at the bottom of the cylinder. The sand mixing equipment has a simple structure. By effectively integrating a muller, a sand fluffing rod, a plough and the scraper plate, rolling, grinding, stirring and turning-over of a material are realized, and sand-mixing efficiency of the sand mixer is enhanced.