69 results about "Screw speed" patented technology

The invention relates to the technical field of injection molding pressure control, in particular to a multi-stage pressure closed-loop compensation system and method for high-precision double-color injection molding, and the system comprises an interface gradient positioning module, a flow resistance state recognition module, a fitting function reconstruction module, a time sequence deviation triggering module and a gain reverse correction module. According to the method, the high-density measuring point data is collected, the interface radial pressure gradient change is extracted through the finite difference method, the stably-arranged nodes at the material intersection can be accurately locked, and the flow resistance state of the flow channel is judged according to the slope difference value of the screw speed and the pressure intensity change. A linear boosting or index slow increasing strategy is automatically switched to reconstruct a pressure function form, local high-pressure accumulation characteristics of a product sensitive area are accurately matched, the coincidence degree of a time window drift trend and a slope sudden change window is monitored, historical displacement and pressure errors are converted into backstepping factors through an iterative learning model, and the backstepping factors are calculated. And a driving gain curve is initialized and revised, so that forming deviation caused by thermal drift of equipment is eliminated.

The invention provides a self-adaptive control method and system for an extrusion screw of a plastic extruder, and relates to the technical field of plastic recovery and regeneration, and the method comprises the following steps: collecting operation data of the plastic extruder; calculating a change trend and an effective value according to the machine head melt pressure; a three-level partition model is constructed, a pressure deviation value is calculated based on the effective value and the target reference value, and a pressure control area is generated according to a comparison result of the pressure deviation value and a pressure threshold value; performing consistency judgment on the change trend and the pressure demand direction to generate an adjustment coefficient, and performing step length correction by combining a pressure control region and a motor load current to generate a rotating speed adjustment amount; the to-be-executed rotating speed of the screw is calculated in combination with the real-time rotating speed of the screw, acceleration limiting processing is carried out to generate the target rotating speed of the screw, and the target rotating speed is coded into a control instruction to be sent to the driving unit, so that the self-adaptive control effect of the extrusion screw can be achieved, and false pressure fluctuation caused by material hardness change is effectively prevented; the extrusion stability and the response speed are obviously improved.

The invention discloses an extruder screw rotating speed intelligent matching and energy consumption compensation method based on deep learning, and relates to the technical field of monitoring analysis, and the method comprises the steps: collecting operation state parameters and material characteristic parameters corresponding to an extruder, constructing a material-equipment coupling data set, carrying out screw equivalent torque analysis based on the material-equipment coupling data set, and carrying out screw equivalent torque analysis based on the material-equipment coupling data set. Generating a screw load characteristic spectrum; temperature-pressure coupling field evolution simulation is carried out according to the screw load characteristic spectrum, melt phase change process parameters are obtained, and then an intelligent rotating speed control curve is generated; establishing an energy consumption compensation coefficient matrix, and performing phase difference compensation mapping on the energy consumption compensation coefficient matrix according to the electric parameter characteristics of the extruder driving motor winding to generate an energy consumption compensation instruction set; and constructing an energy consumption dynamic balance model, carrying out online optimization on the energy consumption dynamic balance model, generating a screw rotation speed-energy consumption cooperative controller, and deploying the screw rotation speed-energy consumption cooperative controller to an edge computing terminal.

The invention discloses high-strength nylon for a humanoid robot and a preparation method of the high-strength nylon. According to the composite material, MXD6 nylon and PA66 nylon are used as a composite matrix, chopped carbon fibers are used as a main reinforcement body, and a flexibilizer, an antioxidant, a lubricant and a nucleating agent are added. The preparation method comprises the following steps: performing vacuum drying on the raw materials, putting the dried raw materials into a double-screw extruder according to a specific ratio, and performing melt blending and granulation at a precisely controlled temperature interval (240-285 DEG C) and a screw rotating speed; and drying the obtained particles, and molding the dried particles into the required structural member through an injection molding machine under specific process parameters. Through synergistic interaction of MXD6 and PA66 and optimization of a processing technology, the composite material with high strength, high rigidity, high fatigue resistance, excellent impact toughness and extremely low water absorption is successfully prepared, and the technical problem that performance of an existing humanoid robot structural part material is unbalanced is perfectly solved; and the motion precision, the load capacity and the long-term reliability of the robot are obviously improved.

This invention relates to the field of polymer material processing and blending technology, and discloses a fiber uniform mixing process in the preparation of bio-based materials. The process includes: controlling the barrel wall temperature of the main dispersion zone of a co-rotating twin-screw extruder to be lower than the intrinsic melting point of the polylactic acid matrix and turning off the external heater; adding jute fiber bundles and the polylactic acid matrix and controlling the screw speed, utilizing the frictional heat balance temperature difference generated by mechanical shearing to maintain the actual melt temperature above the intrinsic melting point; and conveying the mixture to the secondary diffusion zone as the motor drive torque increases, thereby increasing the barrel wall temperature of the secondary diffusion zone and reducing the screw speed to blend the materials. This invention eliminates temperature control lag, maintains a stable shear flow field, avoids a sudden drop in melt viscosity to improve fiber dispersion uniformity, automatically indicates process stage transitions, avoids material thermal degradation, and improves the stability of the mechanical properties of the finished material.

The invention discloses extrusion molding equipment for plastic-wood floor production, and belongs to the technical field of plastic-wood floor production equipment.The extrusion molding equipment comprises an extrusion barrel and a die head assembly, an outer barrel body of the extrusion barrel is divided into a feeding section, a pressurizing section and a homogenizing section, a feeding screw, a pressurizing screw and a homogenizing screw are correspondingly arranged in all the sections, and stator assemblies are arranged on the outer side of the outer barrel body and correspond to all the sections; a rotor assembly is axially arranged in the screw, rotation of the screw is achieved through stator-rotor electromagnetic matching, and the rotating speed of each section of the screw can be independently controlled. The outer diameter of the pressurizing screw is gradually changed, and all the sections of the screw are flexibly connected and sealed through the inserting grooves, the inserting rods, the bearings and the shaft seals. A spiral water cooling pipe and a cooling assembly of radiating fins are arranged in the die head assembly, and the outer cylinder is provided with an exhaust structure with an arc-shaped baffle and a filter screen. Traditional transmission parts are omitted, the energy conversion efficiency is high, material plasticizing is uniform, product shaping is fast, the equipment continuous operation performance is good, and the forming quality and production efficiency of the plastic-wood floor can be improved.

An automatic uncoupled charging device includes a control system, a power system, a charging system, and an auxiliary system. The control system is equipped with a programmable circuit to control a screw speed. Explosives are charged into a container through manual handling or flowing from a mixed explosive vehicle. Explosive bags with different diameters are installed at the bottom of a discharge port. The device is set to start with one click, and the screw drives the explosive into the bag, achieving uncoupled charging. An automatic uncoupled charging method applying to the automatic uncoupled charging device not only reduces labor intensity, achieves fast charging, improves labor efficiency, but also achieves the goal of “mechanization reducing personnel”, further advancing towards the essential safety of blasting construction.

Disclosed in the present invention are a PET composite material having high temperature resistance and a preparation method therefor. The PET composite material having high temperature resistance comprises the following substances in parts by weight: 90.6-96.4% of PET, 1-4% of an impact modifier, 0.1-0.4% of a nucleating agent, 0.8-2% of a nucleation accelerator, and 0.5-2% of an adhesion promoter. The impact modifier has an ethylene content of 85-95%, and a functional group grafting rate is 1.5-4%. The PET composite material is prepared by the following method: (1) weighing the components according to a certain ratio, mixing uniformly, and stirring for 5 minutes using a stirrer; (2) putting same in a TSE-95 twin-screw granulator, wherein the granulation temperature is 250-280°C, and the screw rotation speed is 300-500 r / min; and granulating to obtain a final product. The PET composite material having high temperature resistance prepared in this application has both high temperature resistance and good mechanical properties; energy consumption is reduced, and the processing cycle is greatly shortened.

The application relates to the technical field of building, in particular to a high-molecular composite material for catalytic degradation of formaldehyde and a preparation method thereof, which comprises the following steps: determining the adding amount of a stabilizer based on the melt flow rate and the oxidation induction period of random copolymerized polypropylene, and modifying the stabilizer to obtain a first intermediate product; determining the preset feeding proportion of the first intermediate product based on the oxidation induction period of the first intermediate product; heating and blending raw materials in a screw extruder to obtain a second intermediate product, determining a mixed state characteristic value based on the density and the agglomeration index of the metal oxide, and determining whether the mixed state of the second intermediate product meets the standard, and checking the mixed state when the mixed state does not meet the standard; adjusting the screw rotation speed of the screw extruder based on the melt color uniformity feedback of the second intermediate product; and cooling and forming the second intermediate product after extrusion to obtain a product. The application solves the problem that the uneven dispersion of nanoscale metal oxide particles leads to the local degradation of formaldehyde.

The invention discloses a feeding device and method for slurry stirring, the feeding device comprises a material storage module, the material storage module comprises a material storage hopper and a vibrator, and the vibrator is fixed on the outer side of the material storage hopper; the conveying module comprises a conveying cylinder, one end of the conveying cylinder is communicated with the storage hopper, a conveying screw rod is arranged in the conveying cylinder, and the conveying screw rod is driven by a first power device to rotate; a sensing module; and the control module is used for acquiring the load current, comparing the load current with a preset threshold value, adjusting the rotating speed of the conveying screw rod based on a comparison result, and matching the duty ratio of the vibrator based on a comparison structure, so that the vibrator works at the matched duty ratio. Load current is collected in real time and compared with a preset threshold value, the rotating speed of a conveying screw and the duty ratio of a vibrator are dynamically adjusted, and the screw and the vibrator work cooperatively, so that self-adaption to powder characteristic fluctuation is achieved, material blocking and overload are prevented, and energy consumption is reduced.

The invention relates to the technical field of injection molding machine control, in particular to a self-adaptive control method and system for an injection molding machine. The method comprises the following steps: monitoring the time change rate of injection pressure at the initial stage of executing injection action by a screw rod, locking the moment when the pressure change rate suddenly changes to a non-return closing moment, and calculating a displacement difference value between the initial position of the screw rod and a non-return closing point as a backflow slippage amount; compensation control of double paths is synchronously executed on the basis of the backflow slippage amount, wherein the first path is geometric volume compensation, and position correction operation is executed on a preset injection pressure maintaining switching position; the second path is pressure maintaining pressure compensation, the viscosity attenuation coefficient is determined based on the backflow slippage amount and the screw rotating speed, and subtraction correction is carried out on the set pressure of the subsequent pressure maintaining stage. Through a dual-path compensation mechanism, the problem of melt backflow caused by closing delay of the non-return ring is effectively solved, and the size precision and the quality stability of an injection molding product are remarkably improved.

The application discloses a kind of high-strength high-toughness PET / PEF plastic alloy and preparation method thereof, and the preparation method process is as follows: S1: the preparation of PEF: using polymerization reactor, a certain proportion of 2,5-furandicarboxylic acid, ethylene glycol, catalyst, antioxidant and stabilizer are added, esterification is carried out at 210-230 DEG C for 2-2.5 hours, then slowly vacuum to less than 80pa, after 2-3 hours of polycondensation at 240-260 DEG C, press discharge to obtain PEF;S2: the prepared PEF is dried in blast oven, and PET is dried, then a certain proportion of PET, PEF, chain extender and plasticizer are added to high-speed mixer for stirring;S3: the mixed raw materials are added to double-screw extruder, set temperature and screw speed in each zone, after extrusion, granulation is carried out to obtain PET / PEF plastic alloy.The application uses furan polyester PEF as modifier to modify PET, at the same time, the strength and toughness of PET are enhanced, and the compatibility is good, without adding complex compatilizer, high-strength, high-toughness PET / PEF plastic alloy is obtained.

The invention belongs to the technical field of corrugated pipes for wire harness protection, and particularly relates to a preparation method and application of polypropylene for preparing a corrugated pipe. The preparation method comprises the following steps: mixing ultra-low melt index polypropylene, a PP halogen-free flame retardant, an antioxidant and a lubricant, and putting the mixture into a twin-screw extruder, wherein the MFR of the ultra-low melt index polypropylene is less than or equal to 0.5 g / 10min; the extrusion temperature of the double-screw extruder is 210 DEG C or below, and the screw rotation speed is 220-260 rpm. The corrugated pipe prepared by the technical scheme provided by the invention is environment-friendly and halogen-free, and accords with RoHS (Room of Hazardous Substances) instructions; by optimizing the combined distribution of the screws of the double-screw extruder, the problem that the additive is easy to agglomerate in the processing process of the low-melt-index polypropylene is solved, the stability of melt extrusion is ensured, and the double-screw extruder is particularly suitable for molding of complex corrugated pipes.

The invention belongs to the technical field of methods for simulating and evaluating the wear resistance of a screw, and particularly relates to a method for simulating and evaluating the wear resistance of the screw based on discrete elements, which comprises the following steps of: constructing a three-dimensional assembly model of the screw and a machine barrel, importing the three-dimensional assembly model into discrete element simulation software EDEM, and finishing parameter setting in the EDEM, a particle model is created through a particle generator, the density and Poisson's ratio of particles, the static / dynamic friction coefficient with the surface of a screw and particle size distribution are defined, the density, shear modulus, Poisson's ratio and friction coefficient of the screw and a machine barrel are input, and the contact model is used for describing mechanical behaviors between the particles and between the particles and the screw. The abrasion model is used for representing the screw abrasion process, determining the size and the feeding efficiency of a virtual feeding factory, adjusting the rotating speed of the screw according to equipment parameters, configuring simulation calculation parameters and then starting simulation calculation.

It suppresses the generation of unnecessary shear insulation, preventing discoloration, yellowing, and burning of molded products, and dramatically improving molding quality. [Solution] In advance, as molding conditions, at least a torque target value Ts for screw rotation torque T and an upper limit value Ru for screw rotation speed R are set. During the plasticization process, the rotation of the screw 3 is controlled with respect to the torque target value Ts. At the same time, a graphic display screen 51 is popped up by a changeover switch 50 from the normal waveform display screen 11nn, which displays at least one change data of injection speed V, injection pressure Pp, and mold parting opening Lm during molding, to display at least one change data of screw position X, screw rotation torque T, and screw rotation speed R during the plasticization process.

The application discloses transparent flame-retardant polycarbonate and a preparation method thereof. The preparation method comprises the following steps: dry mixing polycarbonate resin, sulfonate flame retardant, a compatilizer and an additive in a high-speed mixer for 3-8 minutes; melt blending is performed by using a co-rotating twin-screw extruder to disperse the sulfonate flame retardant to a sub-micron level; wherein the twin-screw extruder is provided with a high-shear screw element in a mixing section, and the screw length-diameter ratio is 40:1 to 48:1; the screw rotation speed is 200-400 rpm; extruded strip material is water-cooled and pelletized to obtain transparent flame-retardant polycarbonate particles. By means of the micro-dispersion and compatilization process, micron-level dispersion and stable compatibility of the sulfonate flame retardant in the polycarbonate are realized, so that the flame-retardant efficiency and product life are improved while the high transparency is maintained.

The present invention relates to the technical field of polymeric compound preparation, and in particular, to a preparation method for a biodegradable material for injection molding. The method comprises: obtaining a material-melting thermal image in a melting zone of a twin-screw extruder during a polylactic acid melting process and melt flow sequences in the material-melting thermal image; obtaining melting coefficients on the basis of thermal value variations in the melt flow sequences; obtaining sequence categories on the basis of the melting coefficients, and obtaining a melting effect on the basis of the degrees of stable distribution in the sequence categories and the distribution of the melting coefficients; and adjusting a screw speed of the twin-screw extruder on the basis of the melting effect. According to the embodiments of the present invention, by analyzing the melting state of polylactic acid during a melting process, the melting effect is accurately quantified, thereby allowing for accurate control of the screw speed of the double-screw extruder, ensuring the quality of masterbatch products in the preparation process.

The invention relates to the technical field of high polymer materials, in particular to a polycarbonate composite material with high scratch resistance and stress cracking resistance and a preparation method thereof. The material comprises polycarbonate resin, a core-shell structure flexibilizer, a fluororesin wear-resistant agent, polytetrafluoroethylene wax, a compatilizer, an antioxidant and a lubricant. The method comprises the following steps: weighing the components according to the proportion, and mixing the components in a high-speed mixer for 3-10 minutes to obtain a premix; adding the premix into a double-screw extruder, performing melt extrusion, cooling and pelletizing to obtain the polycarbonate composite material, with the processing temperature range of the double-screw extruder being 220-260 DEG C and the screw rotating speed being 300-500 r / min; through the mode, on the basis of keeping excellent mechanical properties and heat resistance of PC, the surface hardness and scratch resistance of the polycarbonate composite material can be improved, and the polycarbonate composite material has extremely high resistance to chemical solvents and environmental stress.

The utility model discloses stainless steel cold rolling equipment which comprises a support, and through cavities are formed in the two side walls of the support. The gap adjusting device has the beneficial effects that by arranging the servo motor, the main gear, the transmission gear, the first driven gear and the second driven gear, when the gap between the cold rolling roller and the roller is adjusted, the servo motor drives the transmission gear to rotate through the main gear, and the transmission gear drives the first driven gear and the second driven gear to rotate; the specification of the first driven gear is larger than that of the transmission gear, so that the rotating speed of the screw connected with the first driven gear is low, the specification of the second driven gear is smaller than that of the transmission gear, so that the rotating speed of the screw connected with the second driven gear is high, and finally the three groups of cold rollers move downwards at different speeds. And gaps between the cold-rolled tubes and the rollers are gradually reduced, so that synchronous adjustment of the three groups of cold-rolled tubes can be realized.

The invention relates to the technical field of buildings, in particular to a polymer composite material for catalytic degradation of formaldehyde and a preparation method thereof.The preparation method comprises the steps that the adding amount of a stabilizer is determined based on the melt flow rate and the oxidation induction period of polypropylene random copolymer, and modification is conducted to obtain a first intermediate product; determining and adjusting a preset feeding proportion of the first intermediate product based on the oxidation induction period of the first intermediate product; heating and blending the raw materials in a screw extruder to obtain a second intermediate product, determining a mixed state characteristic value based on the density of the second intermediate product and the agglomeration index of the metal oxide so as to determine whether the mixed state of the second intermediate product reaches the standard or not, and verifying the mixed state when the mixed state does not reach the standard; adjusting the screw rotating speed of the screw extruder based on the melt color uniformity feedback of the second intermediate product; and extruding the second intermediate product, cooling and molding to obtain the product. The problem that the local formaldehyde degradation function fails due to uneven dispersion of nanoscale metal oxide particles is solved.

The invention discloses a production process of an ultra-high-gloss and ultra-leveling powder coating, which comprises a high-gloss screw rod, a material proportioning process and a production process, the high-gloss screw rod is used for reducing two threaded blocks of a feeding section and increasing two 60-degree screw blocks so as to improve the extrusion strength and the feeding efficiency, when the high-gloss screw rod is used, an extruder for preparing the material is selected, and the material proportioning process and the material proportioning process are adopted, so that the extrusion strength and the feeding efficiency are improved. A 65 machine with the model of Lingyu can be selected and matched with a modified highlight screw, the rotating speed of the screw of the extruder is controlled at the rotating speed of 45-50 per minute, the feeding speed is controlled at the speed of 20-25, the temperature of a first area and the temperature of a second area are controlled at 75-85 DEG C, and after all condition parameters are adjusted, the extruder can be used as an extruder. The preparation method comprises the following steps: preparing raw materials, carrying out proportional adjustment matching on the used materials needing to be prepared according to 100 kg of the raw material pair shown in the figure 4, pouring the matched raw materials into an extruder, finally selecting a mill for processing operation, and adjusting and matching the parameters of the mill.

This invention relates to the field of polymer materials and protective coatings, and discloses a single-layer UV-resistant heavy-duty anti-corrosion powder coating, its preparation method, and its application. The preparation method of the single-layer UV-resistant heavy-duty anti-corrosion powder coating includes: carboxyl polyester resin, triglycidyl isocyanurate, modified nano-silica, modified chitosan, 2-(2H-benzotriazol-2-yl)-4,6-di-tert-amylphenol, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, flake aluminum powder, and phosphorus... Zinc sulfate, BYK-392, 2-hydroxy-1,2-diphenyl ethyl ketone, and γ-aminopropyltriethoxysilane were mixed at room temperature with stirring at 300-350 rpm for 10-15 minutes to obtain a mixture. This mixture was then extruded using a twin-screw extruder at 110-120°C and a screw speed of 450-500 rpm. The mixture was then ground to obtain a single-layer UV-resistant heavy-duty anti-corrosion powder coating. This single-layer UV-resistant heavy-duty anti-corrosion powder coating can be applied to the protection of metal substrates. The coating prepared by this invention has excellent UV resistance and anti-corrosion properties.

The application provides a kind of biobased composite twin-screw mixing granulation method, belong to biobased composite production technical field, the application controls wood powder moisture content and particle size distribution by raw material pretreatment, establishes subsection heating system by using gradient temperature control mixing, real-time monitoring wood powder thermal degradation parameter and melt flow resistance parameter and enabling temperature gradient and screw speed dynamic adjustment temperature control flow coordination balance algorithm, based on double game model constructs the synergistic optimization framework of thermal stability control and flow improvement, optimal processing parameters are obtained by using improved alternating grey wolf algorithm iterative solution, according to the optimization result adjustment twin-screw extruder operating condition and through wide runner die extrusion molding after cutting granulation packaging, solve the technical problems that thermal stability and flowability of wood-plastic composite material are mutually restricted during high filling amount processing, which leads to the difficulty in synergistic optimization of processing parameters.

The utility model provides a spiral speed regulation type pipeline mixer, which belongs to the technical field of water treatment engineering, and comprises a mixer body, the mixer body is arranged between a water inlet pipe and a water outlet pipe, the mixer body comprises a mixing assembly, a dosing assembly and a power assembly, the dosing assembly is connected with an automatic control box, and the power assembly is connected with a water pump. The output end of the automatic control box is connected with the power assembly, the mixing assembly comprises a turbine arranged in the mixer body, the dosing assembly comprises a coagulant dosing pipe, a flow meter and a temperature transmitter, the coagulant dosing pipe is perpendicular to the rotating direction of the turbine, and after a coagulant is added into water, the hydrolysis speed is high, and the temperature transmitter can be used for transmitting the coagulant to the mixer body. And the concentration of the rapidly dispersed coagulant in water is kept uniform and consistent, so that a relatively uniform polymer can be generated during coagulation hydrolysis, and a flocculation effect can be better played.

The application discloses a kind of aerospace aviation with tin-plated copper core poly perfluoroethylene propylene insulated electric wires and preparation method, it is related to special wire and cable manufacturing technical field.The preparation method includes S1: preparation modified FEP composite material;S2: pretreatment is carried out to extruder;S3: using double-stage decompression type extrusion process, the modified FEP composite material of step S1 is extruded and covered tin-plated copper core forming;S4: using the step cooling mode of partition temperature control to the tin-plated copper core line after covering is cooled.The application is successfully solved the apparent defect problem when FEP high-speed extrusion by the combination technology of " modified formula + vacuum exhaust + step cooling", screw rotation speed can be promoted from traditional <20rpm to 35-50rpm, production efficiency can be improved more than one time, and product surface is smooth, dense, realize high-efficiency defect-free extrusion.

The invention provides a method for improving uneven mixing of a wet diaphragm twin-screw extruder, which comprises the following steps: obtaining materials in the twin-screw extruder, the materials comprising polyolefin resin and an additive, and mixing the materials through a variable-pitch variable-depth screw and a static mixer; the temperature of the extruder cylinder is controlled in a segmented mode, and the temperature is dynamically adjusted through an intelligent temperature control system; the rotating speed and the feeding rate of the screw are adjusted according to material characteristics, and the rotating speed and the feeding rate are optimized in a collaborative mode through a mathematical model and a variable frequency speed regulation technology; pre-treating the material, wherein the pre-treatment comprises a material mixing process and a drying process so as to improve the uniformity of the material.

The invention discloses an integrated forming manufacturing method of an electromagnetic lock shell for high-voltage switch equipment, and relates to the technical field of high-voltage switch component manufacturing, and the method comprises the specific steps of material selection, mold treatment, raw material pretreatment, injection molding and post-treatment. Through innovative design of mold treatment and refining of raw material pretreatment, the production process of the electromagnetic lock shell is optimized, the surface of the mold cavity is provided with the nano coating prepared through the physical vapor deposition method, the wear resistance and demolding performance of the mold are improved, wear and faults in the production process are reduced, the service life of the mold is prolonged, and the production cost is reduced. Through hot air circulation drying and plasma treatment in the raw material pretreatment stage, the fluidity and surface quality of the material are effectively improved, in the injection molding process, it is ensured that a cavity can be fully and evenly filled with melt by controlling key parameters of the temperature of a charging barrel, the rotating speed of a screw and the injection pressure and speed, and the injection molding quality is improved. And the electromagnetic lock shell which is compact in internal structure and high in dimensional precision is formed.

The invention provides a preparation method and application of an ETFE film with extremely low dielectric loss, and the preparation method comprises the following steps: introducing a low-dielectric filler into ETFE resin through melt blending to obtain a composite resin system; the melting temperature is controlled to be 220-240 DEG C, the rotating speed of a screw is controlled to be 30-50 rpm, the cooling rate is controlled to be 8-12 DEG C / s, the crystallinity of the film is controlled to be 30-40%, and the composite resin system is subjected to melt extrusion to form the film; carrying out gradient plasma surface modification and vacuum annealing treatment on the film in sequence; and finally, the ETFE film with extremely low dielectric loss is obtained. The dielectric loss factor of the ETFE film is less than or equal to 0.001. According to the ETFE film prepared by the method, the dielectric constant epsilon r is 2.0-2.2, the dielectric loss factor is less than or equal to 0.001, the tear strength is greater than or equal to 120mN, and the temperature resistance range is-200 DEG C to + 150 DEG C.

This invention discloses a high-power, high-torque conical twin-screw reducer, comprising a reducer housing body and a drive shaft and a driven shaft perpendicularly inserted into the side wall of the reducer housing body. The drive shaft and the driven shaft are driven by meshing drive bevel gears, which transmit rotational speed and torque. The driven shaft includes a first shaft and a second shaft, with the driven bevel gear coaxially fixed to the second shaft. A lifting slider that slides up and down on the outer side wall of the driven shaft is provided below the driven bevel gear. This invention utilizes a mechanism where the sealing condition is broken when the telescopic oil guide rod passes through the valve and inserts into the oil outlet and inlet pipes. Under the condition of driven shaft rotation, the oil injection hole forms a complete oil passage through the oil outlet, connecting hole, and inlet pipe, thereby achieving lubrication of the telescopic gears and the meshing drive and driven bevel gears.

The invention relates to the technical field of processing aids, in particular to an automatic production method of a fluoride-free processing aid and a processing aid master batch. The method comprises the following steps: preparing core-shell structure fluoride-free processing aid powder through a continuous flow reaction, premixing the core-shell structure fluoride-free processing aid powder with carrier resin, and performing melt blending granulation to obtain a melt; and monitoring a conveying process in the melt blending granulation process, and further adjusting heating parameters of corresponding sections. According to the invention, the granulation process is intelligently monitored, so that the root causes of abnormal conditions such as slipping, insufficient melting and overheating are automatically diagnosed according to real-time monitoring of parameters such as temperature, pressure, torque and the like and calculation of the melting rate, and the temperature, the screw rotating speed and the temperature gradient of each area are adaptively adjusted; and meanwhile, the melt energy storage modulus is introduced to evaluate the dispersion state, and the process is self-learned and optimized based on historical data, so that full-process intelligent closed-loop control is realized, the problems of intermittent production quality fluctuation and regulation and control lag are solved, and efficient and stable production of products is guaranteed.