135results about How to "Reduce extrusion" patented technology

The invention discloses a nano fog-dissipation multifunctional greenhouse agricultural film, and in particular relates to a three-layer co-extruded EVA (ethylene-vinyl acetate copolymer) long-life fog-dissipation environment-friendly multifunctional greenhouse film, belonging to the field of agricultural mulching films. The raw material formula of an outer layer comprises the following components in percentage by weight: 20-50% of linear low-density polyethylene (LLDPE), 20-50% of low-density polyethylene (LDPE), 10-20% of metallocene polyethylene (mPE) and 5-10% of double-prevention masterbatch; the raw material formula of a middle layer comprises the following components in percentage by weight: 30-40% of ethylene-vinyl acetate copolymer (EVA), 20-40% of linear low-density polyethylene (LLDPE), 20-40% of low-density polyethylene (LDPE) and 5-10% of three-prevention masterbatch; the raw material formula of an inner layer comprises the following components in percentage by weight: 30-40% of ethylene-vinyl acetate copolymer (EVA), 10-20% of linear low-density polyethylene (LLDPE), 20-50% of low-density polyethylene (LDPE) and 5-10% of three-prevention masterbatch; and the formulas of the outer layer, the middle layer and the inner layer are uniformly mixed respectively, master batches are prepared by using a double-head thread screw double-screw extruding machine, a three-layer film is formed through a co-extrusion die head and is extruded out to prepare the multifunctional agricultural greenhouse film. Every quality technical index of the film reaches or exceeds a national standard, and a small part of the indexes is more than 2 times better than the national standard, so that the film is excellent in antiaging performance and cannot generate fog drops, and the service life of the film reaches more than 3 years.

A construction method for forming pile includes locating the piling machine, perforating while protecting wall by hard pipe or sludge, forming enlarged head, enclosing hole, pouring concrete, and pulling up the pipe. Its tool kit is composed of an external pipe with water discharge opening, internal pipe playing the role of supplying or discharging water, and pile head connected with internal pipe. Its advantages are high quality of pile, and high load-bearing power.

The invention is concerned with a kind of rubber disintegrator. There are two roller canisters set in type of revolving on axis seat and they move inside of the roller. The axis of roller canister is fixed on frame of machine through the bearing seat, and the motor and reducer is droved by the revolving on axis seat and they move inside of the roller. The axis of roller canister is fixed on frame of mach axis of the two roller canisters. The said roller canister is made up of some slice type of drills on the axis with lengthways congruence and the drills of two roller canisters are interleaving. The roller canisters move to different directions and send the top of rubber block between the two roller canisters into the drills for cutting. The structure to exit of stuff is outer screen; with exit of stuff and the main part wrapped by the outer screen is the main body of the two roller canisters. The outer screen is a column and the side of it is the screen, the two bottom of it has circumferential rim and the bottom of each rim on the revolving axis seat is driven by transmission framework.

The invention discloses a processing method of vacuum low-temperature fried okra. The processing method comprises the following steps of: blanching okra after being cleaned in hot water; after cooling, quickly freezing in an instant freezer; placing the frozen okra in maltose solution for vacuum impregnation; after leaching, putting the mixture in the instant freezer for quick freezing; placing the frozen okra in a vacuum fryer for frying; and rotating a centrifugal deoiling machine for deoiling. The processing method has the characteristics that vacuum low-temperature frying technique is adopted for processing, the original color, flavor, taste and nutritional ingredients of okra are kept, the okra is crispy in mouthfeel, and secondary cooking is not required.

The invention discloses a crushing tooth assembly. A crushing cutter tooth is inserted in a cutter tooth installing hole in the middle of the front end face of a tooth holder, the lower bottom surface of the tooth holder is an arc surface, the lower bottom surface of the tooth holder is tangent to a material conveying direction, a front cutter surface is arranged at the front end part of the upper surface of the crushing cutter tooth, a cutter is arranged at the front end of the front cutter surface, a main rear cutter surface is arranged on the front end face of the crushing cutter tooth, and an included angle between the main rear cutter surface and the front cutter surface is an acute angle. In a working process, because the lower bottom surface of the tooth holder is the arc surface tangent to the material conveying direction and the included angle between the main rear cutter surface and the front cutter surface is the acute angle, an extruding force of relevant parts of the crushing tooth assembly to materials in a running process of the crushing tooth assembly can be effectively reduced or avoided, and further the abrasion of a scraper conveyer below the crushing tooth assembly and among the relevant parts is prevented; and an integral assembling structure of the crushing tooth assembly is simple and reliable. The invention also discloses a crushing tooth roller adopting the crushing tooth assembly and a fed material crusher adopting the crushing tooth roller.

The invention discloses a roof cutting and pressure releasing method for a double-filling wall structure in gob-side entry retaining. According to the method, a high-water material is used to construct a first high-water material filling wall on the upper section stoping working face along the edge of a gob; a row of anchor cables are arranged at the edge of the first high-water material filling wall in the propulsion direction of the upper section stoping working face; a second gangue filling wall is constructed on the sides of the anchor cables in the propulsion direction of the working face; the edge of the second gangue filling wall is drilled and filled with explosive or static crushing agents; and then roof cutting is conducted through the pre-splitting blasting effect of the explosive or the static force rock breaking effect of the static crushing agents. According to the method, the gangue wall and the filling wall are arranged to jointly support the overburden weight on the lower section working face, the supporting pressure of the filling wall is effectively relieved, and the entry retaining heaving floor amount is obviously decreased. After a roof is cut down, due to the gangue wall and the buffer distance between the two walls, the squeezing effect of overlying strata after cutting down on the first high-water material filling wall is further reduced, and the stability and safety of the working face are effectively improved.

The invention provides an earth gas collection screw auger which belongs to the drilling tool technical field. In order to solve the problems of complex operation, inconvenient maintenance, poor strength and limited collection depth lying in the prior earth gas collection screw auger, the invention proposes the earth gas collection screw auger comprising a taper bit body, a close cover screw rod, a drill rod and a handle, wherein the taper bit body is in screwed connection with the taper end of the close cover screw rod, the other end of the close cover screw rod is connected with the drill rod, the drill is then connected with the handle, a gas collection chamber is arranged inside the taper bit, vent holes communicated with the gas collection chamber are arranged on the bit, a filter element and a gasket are arranged inside the gas collection chamber, a gas taking long slim pipe contained in the filter element passes through the center of the gasket, and a holding-down bolt is used to compress the gasket to separate the gas collection chamber from the outer atmosphere. The gas taking long slim pipe is connected with a gas taking device after passing through the close cover screw rod, the drill rod and the handle in turn. The earth gas collection screw auger is a manual earth gas sampling device integrating gas picking and collection with convenient carrying, simple assembly, convenient maintenance, high strength, convenient operation, simplicity as well as reliability.

The invention discloses an automatic filling machine, which comprises a machine frame and an electric control device. A film rolling device for storing and releasing a film, a film connecting device for connecting the film, a disinfecting and cleaning device for disinfecting and cleaning the pulled film, a filling device for filling liquid in a film bag, a forming device for turning and rolling the film into a cylindrical structure, a vertical sealing device for vertically piecing and sealing the cylindrical film, a film pulling device for pulling the film to move and a transverse closing andcutting device for transversely closing and cutting the cylindrical film are arranged on the machine frame in turn. The automatic filling machine provided by the invention is high in production efficiency, lower in cost and high in automation degree.

The invention discloses a crushing cutter tooth used for a crushing tooth assembly. The crushing cutter tooth comprises a tooth body; the front end of the upper surface of the tooth body is provided with a front cutter face; the front end of the front cutter face is provided with a cutter; the front end surface of the tooth body is provided with a main rear cutter face; the included angle between the main rear cutter face and the front cutter face is an acute angle. In the working process, the included angle between the main rear cutter face and the front cutter face is the acute angle, the extrusion force to the material caused by the crushing cutter tooth, the crushing tooth assembly and related parts can be effectively reduced or avoided in the running process of equipment, and the abrasion between a scraper conveyor arranged at the lower part and related parts can be further avoided; furthermore, the crushing cutter tooth is simpler and more reliable in a whole assembly structure. The invention also discloses the crushing tooth assembly adopting the crushing cutter tooth.

The invention provides a method for reducing the pulverization rate of a leaf shred bin type feeding machine for preparing tobacco shreds, which comprises the following steps: (1) operating a bottom belt of the leaf shred bin type feeding machine only under the condition that a lifting belt is operated and tobacco shreds are not detected by a putty photoelectric tube; (2) reducing the delay time of the putty photoelectric tube from 1 second to 50 milliseconds; (3) reducing the detection range of a diffuse reflection photoelectric tube on the lower part of a cloth running end; (4) artificially lifting materials by the bottom belt only under the condition that the lifting belt is operated and the tobacco shreds are not detected by the putty photoelectric tube; (5) reducing the height of the putty photoelectric tube, and reducing the material height of the leaf shreds in a triangular area in front of the lifting belt and a material storage bin; and (6)increasing the delay time control of 1 second to an operation signal of the lifting belt. The method controls and adjusts an electrical program and a detection device of the leaf shred bin type feeding machine so as to effectively reduce the pulverization rate of the leaf shreds in the bin type feeding machine in the process of operation.

The invention provides an annular rail guide vehicle active steering device adapting to different rail radii. Two steering units of the same structure are connected with a front part and a rear part of a vehicle frame. Each steering unit comprises an inner wheel support and an outer wheel support, the tops of the inner wheel support and the outer wheel support are connected with the end portions of the inner side and the outer side of the vehicle frame, and two wheels are arranged at the bottoms of the two wheel supports. One end of each adjustable connecting rod component is hinged to the extending-out part of the corresponding outer wheel support, and the other end of each adjustable connecting rod component is hinged to a position-adjustable sliding block on a rocker component. The twoends of each fixed-length connecting rod are hinged to the corresponding rocker component and the corresponding inner wheel support. The two sides of the wheel on each inner wheel support are providedwith guide wheels clamping and holding an inner guide rail from the two sides. Each rocker component is connected with a drive unit. The annular rail guide vehicle active steering device is simple instructure, and through stepless adjustment of the length of the rocker components and the length of the adjustable connecting rod components, a vehicle can meet the traveling requirements of different rail radii, has an active steering function and is easy to install and adjust.

The present invention provides a drip-irrigation band with printed labyrinth flow channel. It is composed of water-conveying channel, hot-pressed edge with several groups of labyrinth flow channel units, labyrinth flow channel water inlet and water outlet. It is characterized by that the described labyrinth flow channel is the hot-pressed gap formed from heat-resisting layer printed on the plastic.

The present invention discloses a quickly-detachable airbag-type floating breakwater, including a plurality of water wave absorbing structure units arranged along a length direction of the breakwater. The adjacent water wave absorbing structure units are connected by a connecting unit. The water wave absorbing structure unit comprises at least two floats arranged side by side and a wave absorbing plate located between the floats. The water wave absorbing structure unit comprises at least two floats arranged side by side and a wave absorbing plate located on the floats. The connecting unit comprises bases located at the ends of the floats, an airbag located between the adjacent bases, and a steel chain, the adjacent bases wrapping the airbag to form a buffer connecting structure. Adjacent water wave absorbing structure units can be quickly and conveniently assembled by a connecting unit, thereby simplifying the difficulty in a breakwater building and construction installation process, improving the post-maintenance convenience of the breakwater, and reducing the post-maintenance cost. The connecting unit adopting a buffer connecting structure formed by wrapping the airbag with the bases can effectively alleviate movement, extrusion and torsion between adjacent breakwaters.

The invention discloses a welding structure of a rotary type compressor pump body. The welding structure is utilized for cylinder welding or flange welding. The external circumference of a cylinder or a flange is provided with at least two welding apertures, and two sides of each one of the at least two welding apertures are provided with concave portions. The concave portions change a pathway of welding heat transmission and a bearing form of a fixed part, enable a cylinder or a flange to cooperate with a housing body by the minimum area, and reduce extrusion effects on a cylinder body, wherein the extrusion effects are caused by housing body deformation produced by welding, thus welded fixed part stiffness is increased; welding deformation is improved; and compressor performances are improved.

The invention relates to an assembled-type concrete beam-column joint and a construction method thereof. The assembled-type concrete beam-column joint comprises a connecting piece comprising a columnend connecting part and a beam end connecting part. The column end connecting part is connected with a prefabricated column. The beam end connecting part is connected with a prefabricated beam. The column end connecting part and the beam end connecting part are fixedly connected. The column end connecting part is pre-buried in the prefabricated column. The beam end connecting part and the prefabricated beam are in post-poured connection. A U-shaped plate is arranged outside the beam end connecting part in a sleeving mode. According to the assembled-type concrete beam-column joint and the construction method thereof, beam components and column components are connected through the connecting piece pre-buried in the prefabricated column, joint force is clear, connecting is reliable, the structure is simple, construction is convenient, and the production efficiency can be effectively improved.

Upon starting continuous extrusion, the temperature of a hard resin and a soft resin is increased in extrusion sections. A screw of the extrusion section of the hard resin is set at high rpm at first. The hard resin reaches a maximum temperature α(° C.) by heating of friction with the screw, and comes to have high flowability. Upon starting conveyance of an assembly, a large amount of molten hard resin and a small amount of molten soft resin are extruded onto the periphery of a tubular structure. Upon passage of a point A of the tubular structure under annular discharge throats, the extrusion amount of the hard resin starts gradually decreasing, and the extrusion amount of the soft resin starts gradually increasing. Since the temperature of the hard resin starts dropping a short time after the decrease in the extrusion amount, the hard resin maintains the high flowability.

The invention discloses a method capable of controlling specific cell sizes to be directionally and selectively distributed in a polypropylene foamed bead. According to the polypropylene foamed bead prepared by the invention, the outer layer of the bead is provided with cells having larger sizes, and the inner layer of the bead is provided with cells having smaller sizes. The sizes of the large cells are in a range of 50 microns to 200 microns, and the sizes of the small cells are in a range of 10 microns to 49 microns. A large cell area accounts for 30-50% of the total volume of the polypropylene foamed bead, and a small cell area accounts for 50-70% of the total volume of the polypropylene foamed bead. Due to anisotropy of cell size distribution, the bead has excellent mechanical property and sound insulation property.

The invention discloses a polycarbonate / polyethylene alloy conductive composite material and a preparation method thereof. The polycarbonate / polyethylene alloy conductive composite material comprises the following components by weight part: 50-80 parts of polycarbonate, 10-30 parts of polyethylene resin, 6-12 parts of conductive carbon black and 2-6 part of compatibilizer. The preparation method comprises the following steps: uniformly mixing the polyethylene resin, the conductive carbon black, heat stabilizers and processing aids in a high-speed mixer, and then entering a co-rotating twin screw extruder to be melted and granulated by extrusion at a temperature of 190 DEG C and 220 DEG C; and after being uniformly mixed, the polycarbonate, the compatibilizer and the conductive polyethylene substrate are directly injected by an injection molding machine to finally obtain the product. The whole composite material of the invention has greatly reduced filling percolation value of the conductive carbon black, and has excellent overall performance. The preparation method has improved processing convenience and reduced production cost.

The invention discloses a W flame boiler with asymmetric front wall and rear wall secondary wind, relates to a pulverized coal boiler, and aims at solving the problem of deflected internal flow fieldin a W flame boiler. The boiler comprises an upper furnace, a lower furnace, a front arch, a rear arch, multiple first pulverized coal combustion devices, multiple second pulverized coal combustion devices, multiple front arch lower secondary air nozzles and multiple rear arch lower secondary air nozzles. Each first pulverized coal combustion device comprises a front arch primary air nozzle and afront arch upper secondary air nozzle, each second pulverized coal combustion device comprises a rear arch primary air nozzle and a rear arch upper secondary air nozzle, multiple front arch lower secondary air nozzles are installed on a front wall in the width direction of the furnace, multiple rear arch lower secondary air nozzles are installed on the rear wall in the width direction of the furnace, the areas of cross sections of the front arch upper secondary air nozzles are smaller than that of the rear arch upper secondary air nozzles, and the areas of the cross sections of the front archlower secondary air nozzles are smaller than that of the rear arch lower secondary air nozzles. The invention belongs to the technical field of boiler combustion.

The invention relates to a high-temperature grease and a preparation method thereof. The high-temperature grease comprises the following raw materials in parts by weight: 60-90 parts of base oil, 6-35 parts of thickening agent, 0.5-4 parts of organic sulfide, 0.1-8 parts of rust-inhibiting additive and 0.5-2 parts of antioxidant. The organic sulfide has favorable oil dissolving property, extreme pressure property, oxidation resistance and capability of lowering friction coefficient, does not lose efficacy under high temperature, and effectively avoids great reduction of extrusion property of grease caused by high temperature.

The invention discloses a preparation method of a high-water-absorption polymer. The polymer comprises the following components (in parts by weight): 40g to 45g of acrylic acid, 55g to 60g of water, 19.28g to 20.5g of sodium hydroxide, 0.01g to 0.02g of N, N' methylene bis-alkenyl amide, 1g to 2g of 3% potassium persulfate aqueous solution, 0.05g to 0.1g of sorbide glycerinum-laurate and 1g to 2g of 3% potassium persulfate aqueous solution. The preparation method comprises the following steps: preparing the acrylic acid aqueous solution with concentration of 55 to 60 percent; adding a cross-linking agent, a surface active agent and a polymerization initiator into the acrylic acid aqueous solution, blowing nitrogen, sending the solution into a blender at a feed speed of 250g / min, sending the 3% sodium bisulfate aqueous solution into the blender at a feed speed of 6 to 10 g / min, enabling the material mixed by the blender to rapidly flow into a screw squeezing device to be polymerized, controlling the temperature at 103 DEG C, discharging the hydrogel polymer out of the squeezing device, drying by virtue of hot air at 160 DEG C, and crushing to obtain the high-water-absorption polymer. The preparation method is stable in product quality, high in yield, labor-saving and high in efficiency.

The present invention provides a substrate connector capable of achieving low profile and narrow gap and high in connection strength. The substrate connector (1) includes a pin header (2) having a plurality of pin header contact members (4), and a female header (3) having a plurality of female header contact members (6). Each of the female header contact members (4) includes a pin-header-side contact part (4b). The female header contact members (6) are provided with female-header-side contact parts (6b) having a long ring shape. The pin-header-side contact parts (4b) are pressed into female-header-side connecting parts (6c) having a long ring shape, and are coupled through a coupling part (4) to achieve a high connection strength. The pin header (2) and the female header (3) can be disassembled through rotating around a carrying part (5d) of a pin header main body (5) and a side edge (7b) of a female header main body (7).

The invention discloses a processing method of potato sticks formed by vacuum low-temperature deep-frying. The potato sticks are processed through the following steps: preparing raw materials of potatoes; cooking the potatoes; extruding the cooked potatoes into mashed potatoes; weighing whole potato flour, and mixing the whole potato flour and the mashed potatoes so as to obtain a mixture; forming the mixture into potato sticks; baking the formed potato sticks; freezing the baked potato sticks; deep-frying the frozen potato sticks; and performing oil removal. The potato sticks disclosed by the invention are processed by combining forming and baking with a vacuum low-temperature deep-frying technology, the original color, the original fragrance, the original taste and nutrient components of the potatoes are reserved, the mouth feel of the potato sticks is crisp, and other kinds of vegetables are added, so that the color of products is rich, and the potato sticks have the characteristics of being nutrient and delicious.

The invention provides a vibrating cable film greenhouse roof and a cable film greenhouse, and relates to the technical field of plastic film greenhouses. The vibrating cable film greenhouse roof includes a cable film greenhouse roof body and a vibrating structure; the cable film greenhouse roof body includes a film support structure and a film material structure, and the film material structure is arranged on the film support structure; the two ends of the film support structure are connected with a top beam structure and a bottom beam structure respectively; the vibrating structure is arranged on the cable film greenhouse roof body; the cable film greenhouse includes the vibrating cable film greenhouse roof, a backbone structure, a side column structure, a gutter column structure and a facade structure, and therefore the cable film greenhouse is formed. The vibrating structure is arranged on the cable film greenhouse roof body, which is conducive to the slipping of snows, so that the amount of steel used in the skeleton of the cable film greenhouse is reduced, the cost is saved, and snow removal is facilitated, which is conducive to the receiving of sunlight (including scattered light) in a snowy day for the cable film greenhouse.

The invention belongs to the technical fields of rubber tires and chemical manufacturing, and relates to a colorful rubber composition for a tire sidewall and a preparation method of the colorful rubber composition. The colorful rubber composition for the tire sidewall is prepared from the following raw material ingredients in parts by weight: 30-40 parts of natural rubber, 10-20 parts of ethylene propylene terpolymer, 45-55 parts of chlorinated butyl rubber, 1-2 parts of tackifying resin, 1.5-2.5 parts of an activating agent without carbon black, 1-2 parts of a dispersant, 0.5-1 part of a no-pollution anti-aging agent, 25-30 parts of kaolin, 30-40 parts of titanium pigment, 19-24 parts of a coloring agent, 1-1.5 parts of an accelerant, 0.4-1 part of sulphur and 0.1 part of an anti-scorching agent. In combination with a three-phase mixing process in the preparation process, the problems of low flexing resistance, low aging resistance and high color fading possibility of a colorful rubber tire sidewall in the prior art are solved. The rubber composition not only meets the requirements of tire sidewall rubber for high flexing resistance and high aging resistance, but also meets the aesthetic vision for a user to modify tire appearance.

The invention provides an earth gas collection screw auger which belongs to the drilling tool technical field. In order to solve the problems of complex operation, inconvenient maintenance, poor strength and limited collection depth lying in the prior earth gas collection screw auger, the invention proposes the earth gas collection screw auger comprising a taper bit body, a close cover screw rod,a drill rod and a handle, wherein the taper bit body is in screwed connection with the taper end of the close cover screw rod, the other end of the close cover screw rod is connected with the drill rod, the drill is then connected with the handle, a gas collection chamber is arranged inside the taper bit, vent holes communicated with the gas collection chamber are arranged on the bit, a filter element and a gasket are arranged inside the gas collection chamber, a gas taking long slim pipe contained in the filter element passes through the center of the gasket, and a holding-down bolt is used to compress the gasket to separate the gas collection chamber from the outer atmosphere. The gas taking long slim pipe is connected with a gas taking device after passing through the close cover screwrod, the drill rod and the handle in turn. The earth gas collection screw auger is a manual earth gas sampling device integrating gas picking and collection with convenient carrying, simple assembly,convenient maintenance, high strength, convenient operation, simplicity as well as reliability.

The invention relates to a packaging material for preventing pressure, moisture and shock, and discloses an air bubble film with good mechanical properties. The air bubble film with good mechanical properties includes a bottom film and a blistered film which are attached and fixed to each other, a plurality of air bubbles formed by blistering are distributed in the blistered film, the bottom filmand the blistered film are respectively made of modified PE, and the modified PE is prepared from, by mass, 28-30 parts of LDPE, 43-52 parts of LLDPE, 20-23 parts of HDPE and 4-5 parts of a flame retardant; and a plastic lubricant is a treated seashell powder with a particle size of 0.4 + / - 0.1 [mu]m, the treated seashell powder is prepared by soaking of seashell powder in a soaking solution, lowtemperature treatment for 10-11 min, drying and screening, the soaking solution is an aqueous solution containing 4 wt% of urea and 8 wt% of NaOH or KOH, and the low temperature treatment temperatureis -15 to -14 DEG C. The plastic lubricant is strong combined with polyethylene, so the strength of the air bubble film is improved.

The invention provides an ultra-high molecular weight polyethylene alloy tube and a preparation method thereof. The tube comprises an alloy tube body and polyethylene composite layers composited on the inner wall and the outer wall of the alloy tube body; each polyethylene composite layer is prepared from, by weight, 40-95 parts of ultra-high molecular weight polyethylene, 3-50 parts of a macromolecule reinforced rheological agent, 2-10 parts of compatilizer, 0.1-2.5 parts of an antioxidant and 0.2-5 parts of additives. According to the ultra-high molecular weight polyethylene alloy tube and the preparation method thereof, the melting viscosity of processing can be reduced, the processing fluidity is improved, tube extrusion molding is prone to occurrence, the tube property is improved, the machine head resistance generated when processing is conducted is reduced, and the production efficiency is improved. More tubes are extruded every hour, the electric energy consumption is less, and the effects of saving energy and reducing consumption are achieved.

The invention is suitable for the technical field of coated fertilizer, and provides sulphur coated urea capable of preventing a coating layer from breaking and a preparation method thereof. The sulphur coated urea capable of preventing the coating layer from breaking comprises 1000 parts by weight of sulphur coated urea and a coating agent, the surface of the sulphur coated urea is coated with the coating agent which comprises 5-15 parts by weight of urea resin and 0.05-3 parts by weight of auxiliary materials. The preparation method of the sulphur coated urea capable of preventing the coating layer from breaking comprises the following steps that the components are weighed according to the formula of the sulphur coated urea capable of preventing the coating layer from breaking, the urea resin and the auxiliary materials are mixed and processed to obtain a blend, and the blend is dissolved in water to form the coating agent; heating treatment is conducted on the sulphur coated urea; the sulphur coated urea is coated with the coating agent, and drying treatment is conducted.