295results about How to "Avoid high temperature" patented technology

The invention relates to the technical field of automobile brake control, in particular to a double-caliper automobile brake, symmetrical assembling equipment and an assembling method.The double-caliper automobile brake comprises a brake disc, two sets of hydraulic calipers are arranged on the brake disc, and each set of hydraulic calipers is connected with an oil pumping structure; the control box is connected with the oil pumping structure; the deflection plate is arranged in the control box, and the deflection plate can be matched with the oil pumping structure to drive the hydraulic calipers to act; the driving assembly is installed in the control box and connected with the deflection plate, and when a brake pedal is stepped down, the driving assembly can drive the deflection plate to act towards the oil pumping structure; and the switching assembly is connected with the driving assembly and the deflection plate, and the switching assembly can drive the deflection plate to deflect when one set of hydraulic calipers keeps the braking action for preset time, so that the two sets of hydraulic calipers alternately execute the braking action, and the high temperature of the braking system is avoided.

The invention relates to the field of billet sectioning, in particular to a billet sectioning device for steel pipe manufacturing and a using method.The billet sectioning device comprises a base, a billet conveying support is fixedly connected to the left side of the top of the base, an annular support is slidably connected to the middle of the top of the base, and a positioning support is slidably connected to the right side of the top of the base; a cutting mechanism is movably connected to the surface of the annular support, and an adjusting mechanism matched with the cutting mechanism is movably connected between the surface of the positioning support and the annular support. The steel billet sectioning device for steel tube manufacturing is composed of the cutting mechanism and the adjusting mechanism, after a steel tube billet on a steel billet conveying support penetrates through the annular support to be limited to the side wall of the positioning support, under the action of the cutting mechanism, the saw disc rotates along the annular support and slowly moves towards the circle center of the steel tube billet to conduct cutting machining, and the cutting efficiency is improved. The contact area of the saw disc and the steel pipe blank in the cutting process is reduced, high temperature on the surface of the saw disc is avoided, and abrasion of the saw disc is reduced.

The invention discloses a hydrophilic graphene dispersion liquid for PCB hole metallization, and belongs to the technical field of circuit board processing, the hydrophilic graphene dispersion liquid comprises the following components by mass: 1-5% of boron-doped graphene, 1-5% of boron-doped graphene quantum dots, 10-40% of polypyrrole, 0.5-1% of a dispersant, and 0.5-2% of a surfactant. The second purpose of the invention is to provide a preparation method of the hydrophilic graphene dispersion liquid for PCB hole metallization, the dispersion liquid is subjected to boron doping treatment on graphene and graphene quantum dots, so that the overall conductivity is enhanced, the hydrophilicity is enhanced, the dispersion liquid has excellent dispersity, and the hydrophilicity of the dispersion liquid is improved. Through the synergistic effect of polypyrrole, boron-doped graphene and boron-doped graphene quantum dots, the stability and adhesion of the composite material are further enhanced.

The invention discloses an automatic cooling sectional type grinding machine for valve rod machining, and belongs to the technical field of valve rod grinding machines, the automatic cooling sectional type grinding machine comprises a supporting seat, a cooling spraying mechanism and a sectional adjusting mechanism, a limiting rod movably penetrates through the lower middle portion of the supporting seat, a lead screw penetrates through the upper middle portion of the supporting seat in a threaded mode, and a water tank is installed at the upper end of the supporting seat; a water inlet hole and a sealing cover are arranged on the water tank and used for adding water into the water tank and sealing the water tank respectively, supporting pipes are installed at the inner top end and the inner bottom end of the supporting seat, the opening ends of the supporting pipes are movably connected with one end of a supporting frame, and a vertical shaft frame is arranged at the other end of the supporting frame. According to the valve rod polishing device, external facilities are not needed, in the valve rod polishing process, water is automatically sucked in the valve rod polishing device and sprayed to the polishing position, high temperature of the polishing position is avoided, the position of the polishing wheel can be automatically adjusted until a boss is polished, and therefore sectional type polishing can be automatically conducted.

The utility model discloses a cooling device for a permanent magnet direct drive motor of a vertical coal mill, which relates to the technical field of permanent magnet direct drive motors and comprises a vertical coal mill body and a motor cooling device. A permanent magnet direct drive motor is fixedly mounted on the surface of the vertical coal mill body; the motor cooling device comprises a cooling cylinder, three connecting pipes, a heat dissipation fan, a first exhaust pipe and a second exhaust pipe, the cooling cylinder is slidably arranged on the surface of the permanent magnet direct drive motor in a sleeving mode, the interior of the cooling cylinder is of a hollow structure, and exhaust holes are evenly formed in the inner wall of the cooling cylinder; the three connecting pipes are fixedly welded to the surface of the cooling cylinder and communicate with the interior of the cooling cylinder, a mounting groove is formed in the lower side of the vertical coal mill body, and cooling air can be rapidly diffused in the cooling cylinder and blown to the surfaces of heat dissipation fins on the surface of the permanent magnet direct drive motor through exhaust holes through the design of the three connecting pipes; therefore, the heat dissipation effect of the permanent magnet direct drive motor is improved.

The invention relates to the field of pharmaceutical preparations, in particular to water-free swallowing granules and a preparation method thereof. The water-free swallowing granules provided by the invention comprise drug-containing taste-masking granules and a taste-modifying material, and the drug-containing taste-masking granules are prepared from drug-containing pellets and the taste-masking material; the raw material of the drug-containing pellet comprises an adhesive, and the adhesive is selected from one or more of povidone, hydroxypropyl methylcellulose, methylcellulose, hydroxypropyl cellulose or starch slurry; the weight ratio of the drug-containing pellet to the taste masking material is (2-10): 1; the taste masking material comprises a coating component and an anti-sticking agent, wherein the coating component is selected from one or more of ethyl cellulose, cellulose acetate, cellulose acetate phthalate, cellulose acetate butyrate, hydroxypropyl methyl cellulose phthalate and carboxymethyl ethyl cellulose; the anti-sticking agent is selected from one or two of lauryl sodium sulfate and talcum powder, and the obtained water-free swallowing granules are easy to swallow and good in stability.

The invention discloses a surface mechanical alloying coated zinc carbonyl iron powder absorbent and a preparation method thereof, a ball-milling mechanical alloying process is adopted, and a uniform and compact zinc coating layer is generated on the surface of carbonyl iron powder to serve as the absorbent of an electromagnetic wave absorbing material. Compared with a traditional chemical zinc plating method, the method has the advantages that the thickness and uniformity of a plating layer can be more accurately controlled, high bonding strength between the zinc plating layer and a carbonyl iron powder matrix is achieved, highly-uniform zinc layer coverage is achieved by adjusting ball milling parameters, excellent cathode protection is provided by using high electronegativity of zinc, and the service life of the carbonyl iron powder is prolonged. The corrosion resistance of the carbonyl iron powder in a high-salinity environment is remarkably enhanced, and meanwhile, the influence on the electromagnetic wave absorption characteristic of the carbonyl iron powder is minimized. The method is simple in technological process and low in cost, the problem that the seawater corrosion resistance of a traditional method is insufficient is solved, the electromagnetic wave absorption efficiency is improved, and a novel electromagnetic wave absorption material solution with economical efficiency and high performance is provided.

The invention discloses a storage battery digital monitoring system capable of testing the internal resistance of a battery, and relates to the technical field of storage battery monitoring, the storage battery digital monitoring system comprises a monitoring control terminal and a monitoring unit, and the input port of the monitoring control terminal is electrically connected with a collection module. According to the storage battery digital monitoring system capable of testing the internal resistance of the battery, the monitoring control terminal can test the storage battery bodies at regular intervals, the monitoring unit can collect parameters of each group of storage battery bodies after testing, and when the battery discharges, the feed protection unit feeds back the electric quantity of the battery pack to a power grid through an inversion grid-connected technology, so that the storage battery bodies are protected. When the battery is charged, switching is carried out through the discharging switching module, and a charging protection module arranged in the discharging switching module can realize protection, constant-current charging, constant-voltage charging and floating charging management at the initial charging stage of the battery, and prevents the battery from being damaged when the battery is charged. The rectifier is impacted by large current of the battery.

The invention provides an oxygen drying method and device, and the method comprises the steps: carrying out the drying and water removal, drying agent regeneration and drying agent cooling of to-be-dried oxygen circulation through at least one dryer, carrying out the drying and water removal to obtain purified oxygen or regenerated purified oxygen, and in the drying agent regeneration, carrying out the heat exchange and temperature rise of one strand of purified oxygen and regenerated oxygen; regenerated oxygen in desiccant regeneration and cooled oxygen in desiccant cooling are cooled and subjected to liquid separation for recycling. According to the oxygen drying method provided by the invention, a multi-dryer sequential control process is adopted, a single dryer is sequentially subjected to adsorption drying water removal, drying agent regeneration and drying agent cooling, and the water content of an oxygen product is not greater than 1ppmv. Meanwhile, the method is simple in process, oxygen emptying is avoided, oxygen resources are utilized to the maximum extent, and the energy consumption is reduced. In addition, the situation that high temperature and impact working conditions occur simultaneously when the valve is opened suddenly in the high-purity oxygen environment is avoided, and the safety of the oxygen drying device is improved essentially.

The utility model discloses an aquaculture pond oxygenation device, which relates to the technical field of aquaculture, and comprises two sliding vertical rods, the lower ends of the two sliding vertical rods are fixedly connected through a cross rod, the lower ends of the two sliding vertical rods are both fixedly connected with limiting discs, the lower ends of the limiting discs are both fixedly connected with ground inserting drill rods, and the ground inserting drill rods are fixedly connected with the ground inserting drill rods. A waterproof machine box is arranged between the upper ends of the sliding vertical rods, sliding seats used for being in sliding connection with the sliding vertical rods are arranged at the two ends of the waterproof machine box correspondingly, and floating balls are fixedly connected to the sides, away from the waterproof machine box, of the sliding seats correspondingly; through the arrangement of the oxygenation pump, the hose, the annular pipe, the fixed air pipe and the aeration disc, air can be conveyed to the bottom of water during working, the air can be dispersed into tiny bubbles through the arranged aeration disc, then the contact area of the air and the water can be increased, the dissolved oxygen rate is increased, and the service life of the air is prolonged. The problem that in the prior art, the underwater oxygenation effect is poor is effectively solved.

The invention belongs to the technical field of electric power engineering, and particularly relates to a cable pay-off device and a working method thereof. The cable pay-off device comprises a base, a vertical plate, a rotating motor, a rotating rod, a bearing seat body, a pay-off barrel, a cable body, a steel wire rope body, a blowing heat dissipation mechanism, a pay-off auxiliary mechanism and the like. The blowing heat dissipation mechanism conducts heat dissipation on a rotating motor and a rotating rod through a rotating fan, and meanwhile the heat dissipation effect is improved by combining a water tank and a heat conduction strip. The paying-off auxiliary mechanism conducts guiding and auxiliary paying-off on the steel wire rope through an auxiliary roller, a belt and other devices, and lubricating is conducted through the lubricating mechanism. The cable pay-off device is compact in structure and comprehensive in function, the cable pay-off efficiency and stability are improved, and the cable pay-off device is suitable for the pay-off requirements of cables of different specifications and types.

The invention relates to the technical field of battery heat management, in particular to a solid-state battery pack heat dissipation structure which comprises a shell and a heat dissipation pipe, and a solid-state battery pack is inserted into the shell; the heat dissipation pipes are of a wave-shaped structure and are inserted between the adjacent rows of battery cells in parallel; each heat dissipation pipe is provided with a plurality of fixed pipe sections and rotating pipe section groups which are alternately arranged along the extension direction of the heat dissipation pipe, each rotating pipe section group comprises a rotating pipe section which can rotate, and the fixed pipe sections and the rotating pipe section groups of the adjacent heat dissipation pipes are correspondingly arranged and are respectively clamped on two sides of the same battery cell; the first end of the heat dissipation pipe can receive cooling liquid from the outside, and the second end of the heat dissipation pipe can discharge the cooling liquid, so that heat generated by the battery cell is absorbed through the cooling liquid. And when any battery cell is damaged, the damaged battery cell can be easily taken out due to sliding friction between the battery cell and the rotating pipe section, so that the convenience in use is improved.

The utility model relates to the technical field of reaction kettles, in particular to a glue synthesis reaction kettle. According to the technical scheme, the stirring device comprises a stirring barrel and further comprises a circulating mechanism, the circulating mechanism comprises a suction column which is rotationally installed in the stirring barrel and located in the middle, the height of the suction column is equal to that of the interior of the stirring barrel, and a plurality of first discharging pipes are rotationally installed in the stirring barrel; the height of the first discharge pipe is equal to that of the interior of the stirring barrel, the first discharge pipe is attached to the inner wall of the stirring barrel, and the circulation mechanism controls the suction column to suck glue in the middle of the stirring barrel and uniformly discharge the sucked glue on the inner wall of the stirring barrel through the first discharge pipe. According to the utility model, colloid close to the suction column in the stirring barrel is sucked into the suction column through the suction hole by virtue of the pump body, and the sucked colloid is conveyed into the discharge pipe and is finally sprayed out through the discharge hole, so that the colloid in the middle of the stirring barrel can be moved to the inner wall of the stirring barrel, and the heating is uniform.

The utility model discloses a roll surface remanufacturing cutting device, which relates to the technical field of roll cutting, and comprises a bottom plate, the top of the bottom plate is fixedly connected with a support frame, the inner wall of the bottom plate is provided with a plurality of flow guide holes, and the outer wall of one end of the bottom plate far away from the support frame is fixedly connected with a support box. According to the roller cutting device, the rotating shaft on the motor is arranged, when a roller is cut, the motor is started firstly, when the motor is started, the rotating shaft can be driven to enable the roller to start to rotate, and the device can be supported by the fixing block clamped on the roller under the fixation of the positioning drill; the positioning drill can drive the second bearing to rotate in the stabilizing ring, the cutting block is pushed to slide in the moving groove, the front end of the cutting block is attached to the outer surface of the roller so that the cutting block can cut off the iron sheet, the multiple rotating pieces are rotated so that the fixing rod can be fixed in the fixing groove, and the cutting block can be integrally fixed. The required cutting depth can be conveniently adjusted.

The utility model relates to the technical field of smelting equipment, in particular to a belly pipe of a blast furnace air supply device. The device comprises a belly pipe, the belly pipe is composed of a bent pipe and a straight pipe, the straight pipe is provided with an oblique insertion type coal injection gun pipe opening, and the device is characterized in that the internal diameter phi 1 of the bent pipe is 270mm, the internal diameter phi 2 of the straight pipe and a bent pipe flange is 160mm, and the internal diameter phi 3 of the straight pipe is 175mm; and the angle alpha of an opening of the obliquely inserted coal injection gun on the straight pipe is 9.2 degrees. After transformation, high temperature is avoided, energy is saved, and production cost is reduced. The service life of the coal injection gun and the tuyere small sleeve is prolonged, the coal injection ratio is increased, and the pig iron cost is reduced. Labor intensity of workers is reduced, and finally long-life operation of the tuyere device is achieved. And 4, the average service life of the coal injection gun is prolonged from 10 days to more than 60 days by improving the angle of the oblique insertion type spray gun non-return hot air device on the straight pipe and the coal gun, and the average service life of the tuyere small sleeve is prolonged from 5-6 months to more than 8 months.

The present invention relates to the field of mold technology, and in particular to a ductile iron pipe processing and forming mold, comprising a mold body, a retaining ring is coaxially slidably installed in the inner hole of the mold body, a fixed cylinder is coaxially fixed on one side of the retaining ring, an annular groove is coaxially opened on the outer surface of the fixed cylinder, a driving ring is coaxially slidably installed in the annular groove, the driving ring is transmission-connected with a first driving unit, the first driving unit is used to drive the driving ring to rotate in the annular groove, and a plurality of friction devices are circumferentially fixed on the surface of the driving ring. The present invention can quickly complete the removal of paint from the surface of the inner hole of the mold by axially installing a retaining ring in the inner hole of the mold body, and circumferentially arranging a plurality of grinders that can perform circular motion on the fixed cylinder connected to the retaining ring, and each grinder has a self-cleaning function, which can automatically remove paint debris attached to the surface.

The invention relates to the technical field of numerically-controlled lathes, and discloses a numerically-controlled lathe for front axle steering knuckle part machining, which comprises a numerically-controlled machine tool, the surface of the numerically-controlled machine tool is slidably connected with a sealing door, the bottom of the numerically-controlled machine tool is fixedly connected with a storage rack, the surface of the storage rack is communicated with a circulating pipe, and one end, far away from the storage rack, of the circulating pipe is communicated with a nozzle; a triangular chuck is arranged in the numerical control machine tool, and a cutting device is arranged at the end, away from the triangular chuck, of the numerical control machine tool. After the front axle steering knuckle is fixed into the numerical control machine tool through the triangular chuck, the cutting device is started to cut the front axle steering knuckle, a spray head sprays cooling liquid in a storage frame to the surface of the front axle steering knuckle through a circulating pipe, and the situation that the front axle steering knuckle is high in temperature during cutting is avoided; scraps generated during cutting can fall into the storage frame and the extrusion component, the extrusion component is started to extrude the scraps, and cooling liquid in the scraps can be rapidly extruded out.

The invention discloses a preparation method of a bismuth-oxygen-sulfur two-dimensional material, which comprises the following steps: S1, preparing a precursor: carrying out first heating on Bi2S3 in a protective gas atmosphere to partially decompose the Bi2S3 to obtain the precursor; the precursor is prepared from Bi and Bi2S3; and S2, confinement growth: placing the precursor between two parallel substrates, clamping the substrates, carrying out second heating in an oxygen-containing atmosphere at the same time, carrying out an oxidation reaction on the precursor, and carrying out adsorption nucleation and growth on an oxidation product on the surfaces of the substrates to form the bismuth-oxygen-sulfur two-dimensional material. According to the preparation method, the low-melting-point precursor is obtained by pretreating Bi2S3, so that the preparation of the bismuth-oxygen-sulfur two-dimensional material at low temperature becomes possible, and the energy consumption is effectively reduced; and the bismuth-oxygen-sulfur two-dimensional material is obtained through a confinement growth method, and the obtained bismuth-oxygen-sulfur two-dimensional material has the characteristics of uniform thickness, controllable size, high yield and high quality.

The utility model discloses a steel sharpening machine which comprises a machining table, a stand column is arranged on one side of the machining table and is of an L-shaped structure, a blocking cover is arranged on the side wall of the bottom of the stand column, a flow guide plate is detachably connected to the outer wall of the blocking cover in an embedded mode, the flow guide plate is communicated with the interior of the blocking cover, and an air pipe is fixedly connected to the side wall of the top of the flow guide plate. One end, far away from the flow guide plate, of the air pipe penetrates through the stand column and is detachably connected with a suction fan, and the suction fan is detachably connected to the side wall of the top of the stand column. And in cooperation with the suction fan, the sundries splashing into the flow guide plate can be sucked through the air pipe, and therefore the situation that the sundries are accumulated on a machined part and seriously affect grinding is avoided.

The utility model discloses an automatic control alarm system for a boiler, which relates to the technical field of boilers and comprises a cabinet body, buffer mechanisms are mounted on the left inner wall and the right inner wall of the cabinet body, a circuit board is fixedly mounted between the buffer mechanisms, a plug port is arranged on the front side surface of the circuit board close to the lower side, and a control unit is arranged in the middle of the front side surface of the circuit board. An audible and visual alarm is fixedly installed on the upper surface of the cabinet body, cooling mechanisms are embedded in the middles of the left side wall and the right side wall of the cabinet body, dehumidification boxes are installed on the left side wall and the right side wall of the cabinet body close to the lower side in a threaded mode, a rubber protection ring is arranged on the lower surface of the cabinet body, and a cabinet door is hinged to the front face of the left side wall of the cabinet body. The boiler alarm cabinet has the acousto-optic alarm function, the mobile phone alarm function and the background server alarm function, workers can conveniently solve the problems of a boiler in time, the sealing and cooling functions of the cabinet body are added, internal high temperature and dust are effectively prevented from entering the boiler, the service life is prolonged, and the boiler alarm cabinet is not prone to being collided and damaged and safe to use.

The utility model belongs to the technical field of photovoltaic glass kilns, and relates to a photovoltaic glass kiln overflow port flame blocking brick replacing device. Comprising a device body (1) which is of a long-strip-shaped structure, a clamping cavity (2) is formed in the lower portion of the device body (1), a clamping cavity opening (3) is formed in the lower portion of the clamping cavity (2), the width of the upper portion of the clamping cavity (2) is larger than that of the clamping cavity opening (3), a clamping end (5) is arranged on the upper portion of a flame blocking brick (4), and the width of the upper portion of the clamping end (5) is larger than that of the lower portion of the clamping end (5). The photovoltaic glass kiln overflow port flame blocking brick replacing device is simple in structure, flame blocking bricks can be replaced conveniently and rapidly, batch replacement is achieved, the labor intensity of workers is lowered, the probability of injury of the workers is lowered, the replacing efficiency is improved, and production losses caused by too long downtime are reduced.

The utility model relates to the technical field of material grinding, in particular to resin production and processing grinding equipment which comprises a rack, a guide seat, a cooling box and a liquid pump. A discharge pipe is arranged at the bottom of the grinding barrel. The guide seat is arranged in the grinding barrel, a grinding roller is arranged on the inner side of the guide seat, and a motor A for driving the grinding roller to rotate is arranged on the rack. The cooling box is arranged on the rack, a return pipe is arranged on the cooling box, the other end of the return pipe is inserted into the guide seat, a branch pipe A is arranged on the return pipe, and the other end of the branch pipe A is inserted into the rotating shaft along the bottom of the rotating shaft and communicated with the interior of the grinding roller. The liquid pump is arranged on the rack, a liquid pump pumping pipe is inserted into the cooling box, the other end of a liquid pump liquid outlet pipe is inserted into the rotating shaft along the top end of the rotating shaft and communicated with the interior of the grinding roller, a branch pipe B is arranged on the liquid outlet pipe, and the other end of the branch pipe B is inserted into the guide seat and communicated with the interior of the guide seat. According to the utility model, the guide seat and the grinding roller are cooled, so that the service life of equipment is prolonged, and the grinding efficiency is improved.

The utility model discloses a hydraulic control butterfly valve with good heat dissipation performance, which belongs to the technical field of valves, and comprises a valve casing, bearings are arranged on the opposite inner walls of the valve casing, a same rotating shaft is arranged in the two bearings in a penetrating manner, the surface of the rotating shaft is fixedly connected with a valve plate, the top end of the rotating shaft is fixedly connected with a rotating plate, and the rotating plate is fixedly connected with the valve plate. The bottom of the rotating plate is fixedly connected with a sliding rod, the surface of the sliding rod is movably sleeved with a sliding barrel, the surface of the valve shell is fixedly connected with a supporting plate, and the top of the supporting plate is fixedly connected with a fixing plate. The hydraulic cylinder has the beneficial effects that the refrigerator and the cooling liquid are arranged, the cooling liquid is cooled through the refrigerator, hydraulic oil in the coil pipe is cooled through the cooling liquid, meanwhile, the hydraulic oil in the hydraulic cylinder is circulated through the oil inlet hose and the oil outlet hose, high temperature of the hydraulic oil in the hydraulic cylinder is avoided, and normal use of the hydraulic cylinder is guaranteed; the service life of the hydraulic cylinder is ensured.

A flat motor disclosed by the present invention comprises a stator assembly and a rotor assembly located at the inner side of the stator assembly, the rotor assembly comprises a rotor reel, the rotor assembly further comprises a heat dissipation fan, the heat dissipation fan is located at the axial side of the rotor reel, the heat dissipation fan comprises a mounting ring, and the mounting ring is located at the axial side of the rotor reel. One side of the mounting ring is provided with a plurality of mounting parts, the plurality of mounting parts are arranged in the circumferential direction of the rotor winding frame, the plurality of mounting parts are connected with the rotor winding frame in an inserted mode, the other side of the mounting ring is provided with a plurality of fan blades, and the plurality of fan blades are arranged in the circumferential direction of the rotor winding frame. According to the flat motor, the heat dissipation capability can be improved, so that the torque and the power of the flat motor are improved, the use requirement is met, and meanwhile, the influence on the service life of the flat motor is reduced.

The utility model discloses a TSV-based multi-chip packaging structure, which relates to the technical field of chip packaging and comprises a bottom box, a first partition plate, a second partition plate and a heat dissipation structure, the upper surface of the bottom box is fixedly connected with a cover plate, one end of the bottom box is internally provided with the first partition plate, and the other end of the bottom box is internally provided with the second partition plate. A first chip, a second chip and a third chip are arranged between the first partition plate and the second partition plate, and the sides, away from each other, of the first partition plate and the second partition plate are each provided with a set of heat dissipation structures. The first heat conduction silica gel rod, the second heat conduction silica gel rod and the third heat conduction silica gel rod are used as media to be transmitted to the heat dissipation fins, meanwhile, air enters and exits the bottom box from the heat dissipation holes in the outer surfaces of the two sides of the two ends of the bottom box, heat adsorbed by the heat dissipation fins is dissipated when the air enters and exits the bottom box, and the service life of a chip is effectively prolonged.

The invention discloses a crushing excavator hydraulic cooling system and an excavator, and belongs to the technical field of engineering machinery, the crushing excavator hydraulic cooling system comprises a crushing device and an excavating device, the excavating device is connected with a main valve through an excavating oil return passage, and the main valve is connected with a hydraulic oil tank through a main oil return passage and a bypass oil return passage; the crushing device is connected with a crushing oil return passage; the crushing oil return passage is connected with the main oil return passage; the second crushing oil return passage is connected with the crushing oil return passage and the bypass oil return passage; and the second crushing oil return passage is provided with a third back pressure valve. The crushing oil return passage is not connected with the main valve any more, hydraulic oil cannot directly return to the hydraulic oil tank from the second back pressure valve, but enters the radiator, and the heat dissipating capacity can be increased; a second crushing oil return passage and a third back pressure valve are arranged, the opening pressure of the second crushing oil return passage is increased, hydraulic oil in the crushing oil return passage flows through the radiator without back pressure to be radiated and returns to the hydraulic oil tank, and the situation that the radiator is damaged due to the fact that the pressure of the crushing oil return passage is too high under extreme conditions is avoided.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

The utility model provides an electric arc furnace energy -saving type furnace cover, including setting in the electric arc furnace furnace cover of furnace body top, the electric arc furnace furnace cover outer wall integrative extension ring, the electric arc furnace furnace cover inside start to have the water tank, extension ring outer wall fixed mounting has the water inlet pipe and the water outlet pipe respectively, the water inlet pipe and the water outlet pipe all are linked with the water tank, the electric arc furnace furnace cover top fixed mounting has L type pipe, L type pipe end is connected with the connecting pipe, the connecting pipe is away from L type pipe one end fixed connection has the wind collecting bucket, be provided with the blower mechanism on the wind collecting bucket, extension ring outer wall inserts has the U type hanger, extension ring top is provided with locking mechanism, this furnace cover can cool the cooling water flowing in the inside, make reduce the evaporation consumption of cooling water, has realized the energy -conservation, still be provided with the detachable hanger, can effectively avoid the furnace cover long time to be received on the high temperature furnace cover's lifting lug and be loose, like this has the problem of the security hidden danger when replacing the furnace cover and hoisting.