39results about How to "Avoid carbonization" patented technology

The invention discloses an efficient water-cooling circulating radiofrequency ablation needle which comprises a radiofrequency ablation needle body, an ablation needle handle, a Y-shaped water tank, an outflow pipe, an external outflow pipe, an inflow pipe, an external inflow pipe, an inner needle cooling liquid inflow pipe, a temperature thermocouple, an inner needle galvanic couple wire, a radiofrequency needle positive electrode connecting wire, a negative electrode patch and the like. According to the invention, more efficient water-cooling circulating cooling of the tip of the radio frequency needle is realized by adopting an efficient convection water-cooling circulating structure design; the needle tip part of the radiofrequency ablation electrode adopts a novel development structure or an ultrasonic development coating, so that the development of the needle tip part of the electrode under ultrasonic guidance can be remarkably improved; a spiral nut double-sealing-ring buckle structure is innovatively designed for the water circulation Luer taper of the radiofrequency ablation needle, and the sealing performance and stability of a water pipe connector are remarkably improved; the radiofrequency ablation electrode needle has an efficient and stable water-cooling circulation system and development positioning.

The application provides a plate drying device, which comprises a drying box and a loading vehicle. A drying assembly is arranged in the drying box. A plurality of clamping grooves are formed in a bearing flat plate of the loading vehicle. Plates are inserted into the clamping grooves. A jacking assembly is arranged in the clamping grooves and is lifted to make the plates exposed completely when the jacking assembly is lifted. An elastic member is fixed to one side of the bearing flat plate. The other end of the elastic member is connected with a longitudinally extending support column. The other end of the support column is connected with a pressing plate which extends horizontally above the bearing flat plate. The plate drying device can push the plates out of the clamping grooves through the jacking assembly, so that the plates are exposed completely and are dried by the drying assembly. The drying effect is improved. The pressing plate is driven by the elastic member to press the plates up and down. The movement tracks of the plates to the left and right are limited by the clamping grooves. The limiting effect is good. The stress of the limiting parts is balanced. The plates are not damaged by the pressing marks.

The utility model discloses a kind of alginate fertilizer processing constant-temperature reaction equipment, specifically related to fertilizer processing equipment technical field, including base, reaction assembly is arranged on the base, the reaction assembly includes the processing cylinder being arranged at the top of base, the inner chamber bottom of the processing cylinder is provided with electric heating disc, the top of the electric heating disc is provided with heat conduction column, the outside of the heat conduction column is provided with swivel, the top of the swivel is provided with stirring belt, the stirring belt is sleeved on the outside of heat conduction column.The utility model can realize temperature stable control in processing process by electric heating disc, avoid because local overheating leads to polysaccharide in alginate raw material excessive degradation into invalid small molecule, and, the uniform heat conduction of heat conduction column: cooperate electric heating disc and evenly transmit heat to different areas in processing cylinder, avoid temperature difference under traditional heating mode, further reduce raw material quality problem caused by local temperature anomaly.

The utility model discloses a concrete pole tip end socket structure which comprises an end socket body, a sliding groove is formed in the upper end of the end socket body, a cover plate is arranged at the upper end of the end socket body in a clamped mode, the cover plate is made of composite materials, a sliding groove is formed in the end socket body, and clamping plates are fixedly connected to the ends of a plurality of sets of sliding rods. The inner walls and the outer walls of the clamping plates and the sliding plates are all in an arc shape, elastic mechanisms are arranged on the outer walls of the sliding rods, and driving assemblies for driving the two clamping plates to slide are installed in the sliding grooves. According to the electric pole sealing head, a traditional external screw fixing mode is avoided in the mode that the clamping plates are clamped from the interior of an electric pole, penetrating screw holes do not need to be formed in the sealing head body and the electric pole, and a water seepage path is fundamentally eliminated. The clamping plates are tightly attached to the inner wall of the electric pole, the pre-tightening force of the springs is combined, a dynamic sealing barrier is formed, water and dust are effectively prevented from entering the electric pole, steel bar corrosion and concrete carbonization are avoided, the service life of the electric pole is further prolonged, and the structural safety of the electric pole is further improved.

The application discloses a bamboo bending device which is mainly composed of a speed-regulating motor, a belt transmission, a bending arm, a gas-liquid mixing cylinder, a force-adding pressure head, a bending die, a fixed die, a bending roller, a temperature control device and a heating device. The bending arm is fixed on a main shaft through a key groove, and the overall shape of the bending arm is similar to an L type. The bending die is fixed on the bending arm through a shaft, and the fixed die is fixed on a box body through a stand column. The gas-liquid mixing cylinder is fixed on a single-ear or double-ear cylinder base through a screw, and a stand plate is fixed on the cylinder base through a screw, so that the gas-liquid mixing cylinder can rotate by a certain angle on the bending arm. The force-adding pressure head is fixed on a cylinder head through a screw, and a linear slide rail is fixed on the force-adding pressure head through a screw, so that the movement track of the force-adding pressure head is positioned. The bending roller is fixed on the force-adding pressure head through a fixed shaft, so that the bending die, the fixed die and the bending roller can be just put into a bamboo and fixed in the initial position.

The invention relates to the technical field of motor production, in particular to a flat wire motor stator hairpin wire paint removing device and a paint removing method. Comprising a laser, a conduction optical fiber, an optical isolator output head, a beam expander, a scanning range adjusting structure, a scanning speed adjusting structure, a focusing lens and a dust collection structure. The laser is used for emitting laser beams; one end of the conductive fiber is connected with the laser; the output head of the optical isolator is connected with the other end of the conduction optical fiber; the scanning range adjusting structure is located on a light path of the laser beam led out by the optical isolator output head; the scanning speed adjusting structure is used for adjusting the scanning speed of the laser beam in a certain direction; the focusing lens is located on a light path of the laser beam reflected by the scanning speed adjusting structure; the dust collection structure is located between the focusing lens and the hairpin line to be depainted. The paint removing device is simple in structure and convenient to operate, the paint removing efficiency of the hairpin wire of the stator of the flat wire motor can be greatly improved, and the paint removing quality and effect are improved.

The invention provides an ablation needle, an ablation device and an ablation system.The ablation needle comprises a needle body, the needle body is provided with an inner cavity, and the needle body is provided with an ablation section and a perfusion section; the filling section comprises at least two filling holes, and each filling hole serves as an outlet of the inner cavity and is communicated with the inner cavity; the ablation section comprises at least one electrode for releasing ablation energy; the ablation section is provided with a far end, a first section is arranged between the far end and the perfusion hole closest to the far end, the length of the first section is L1, and the distance between the two perfusion holes farthest from the far end is L2 of the perfusion section; wherein L1 is smaller than or equal to L2. According to the ablation needle, the length of L1 is set to be smaller than or equal to L2, when the ablation needle is used for ablation, perfusion liquid from the perfusion section can make contact with the first section in the outer surface of the ablation section in time, and the situation that the temperature of the first section rises too fast, so that the temperature of tissue located around the first section also rises too fast, and consequently carbonization occurs is avoided.

The utility model discloses a novel filter cellular board which comprises a filter board main body which is integrally in a disc shape, a plurality of through discharge holes are formed in the filter board main body, the center line of one discharge hole coincides with the center line of the filter board main body, and the centers of the other discharge holes are uniformly arranged on a plurality of concentric circles which take the center of the filter board main body as the circle center. And the center connecting lines of the discharge holes on the concentric circles extending outwards from the center of the filter plate main body are distributed in a circular arc shape. The filter is scientific in principle and simple and compact in structure, the structural strength is improved, the filtering area is increased, the material passing efficiency is improved, and the quality of filtered materials is also greatly improved.

This invention discloses a microwave ablation electrode, relating to the field of medical device technology. It mainly includes a main needle body, whose working end can release microwave energy to achieve microwave ablation. The main needle body is equipped with a non-working end circulating cooling structure and a working end liquid injection structure. The non-working end circulating cooling structure allows a cooling medium to reach the non-working end of the main needle body to cool the non-working end and surrounding tissue, and also allows for the return flow of the cooling medium. The working end liquid injection structure allows a cooling medium to reach the working end of the main needle body to cool the working end and surrounding tissue, and also allows the cooling medium to be injected into the lesion tissue, absorbing microwave energy to form steam, achieving steam thermal ablation. This invention achieves dual ablation through steam thermal ablation and microwave ablation, improving the ablation effect, reducing the temperature of the working end of the microwave ablation electrode, and increasing the moisture content of the tissue surrounding the working end, thus reducing carbonization of the lesion tissue.

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 invention relates to an intelligent adjustment method, system and equipment for a hot runner temperature control box based on artificial intelligence, a medium and a program product. The method comprises the following steps: outputting a preheating signal and a heat preservation signal; waiting and acquiring a temperature signal after preheating and a temperature signal after heat preservation; whether the temperature signal after heat preservation is larger than a preset first temperature threshold value or not is judged; if not, the preheating signal and the heat preservation signal are adjusted, so that the temperature signal after heat preservation is higher than a preset first temperature threshold value; and inputting the temperature signal after heat preservation into a preset temperature compensation relation to calculate a temperature compensation signal parameter, and outputting a temperature compensation signal according to the temperature compensation signal parameter. Three links of preheating, heat preservation and temperature compensation are arranged on the hot runner, injection molding materials are heated in three stages, and the injection molding materials are heated to the temperature suitable for extrusion in the temperature compensation stage, so that power consumption can be reduced, the injection molding materials are prevented from being carbonized in the hot runner, and the product forming quality can be improved.

The invention discloses a double-crosslinking self-healing hydrogel and a preparation method thereof.The method comprises the steps that firstly, microcrystalline cellulose is treated into nanocellulose through a mixed acid hydrolysis and ultrasonic treatment combined method, and then the hydrogel is prepared, specifically, water is added into PVA, and a PVA solution is prepared; adding the obtained nanocellulose into the prepared PVA solution to obtain a mixed solution A, wherein the mass fraction of the nanocellulose in the mixed solution A is 2.5 wt%-3.5 wt%; and finally, adding water into anhydrous sodium tetraborate to prepare an anhydrous sodium tetraborate solution with the mass fraction of 4-8%, and adding the obtained anhydrous sodium tetraborate solution into the mixed solution A to obtain the nanocellulose-based hydrogel. The prepared porous composite hydrogel is low in cost, mild in reaction, high in output efficiency, good in biocompatibility and high in mechanical strength, and has wide application prospects in the fields of biomedicine, intelligent detection, environment purification and the like.

The invention discloses a production process of a high-flatness butyl adhesive tape, and belongs to the technical field of adhesive tape processing, and the production process of the high-flatness butyl adhesive tape is characterized by comprising the following steps: S1, stirring raw materials for producing the butyl adhesive tape in a stirring furnace to form a rubber material, and vacuumizing the rubber material; s2, adding the rubber material obtained in the step S1 into an extruder for melt extrusion, and arranging a filter screen at the tail end of the extruder, which is connected with a mold; and S3, the adhesive tape extruded in the step S2 is subjected to water cooling and then rolled, and the technical effect of reducing the influence of bubbles and impurities on the surface flatness of the butyl adhesive tape is achieved.

The invention discloses a non-polar high-voltage foamed aluminum-based hybrid super capacitor and a preparation method thereof, and belongs to the technical field of super capacitors. The super capacitor adopts a symmetrical non-polar structure, a composite electrode comprises a pure aluminum current collecting layer, a foamed aluminum matrix layer and a uniform anodized aluminum oxide insulating layer which is prepared by coating the surface of a matrix aluminum rib with a directional scouring process, active carbon coating without hole blockage is realized through gas-phase camphor occupation, and the rated working voltage of a monomer is 6-10V; and after being connected in series and in parallel and superposed, a plurality of monomers are packaged by insulating heat-conducting silica gel and a heat-dissipating aluminum shell to form a high-voltage module The industrial problems of foamed aluminum pore-forming carbonization, uneven oxidation film and activated carbon hole blocking are thoroughly solved, the product power density is 15-25 kW / kg, the cycle life is larger than or equal to 1 million times, breakdown is avoided through nonpolar reverse connection, and the method can be widely applied to middle-high voltage power electronic scenes such as inverters, frequency converters, solid-state transformers and power reactive compensation.

This invention discloses a basalt fiber thermoplastic preimpregnation device, comprising a processing table, with a first support frame and a second support frame fixedly connected to both sides of the top of the processing table. A yarn guiding device is installed on the first support frame, and a winding device is installed on the second support frame. The preimpregnation assembly includes an impregnation mold and a third support frame, the third support frame being fixedly connected to the top of the processing table. The impregnation mold is mounted on the third support frame, and the yarn guiding device and winding device are respectively configured corresponding to the impregnation mold. The impregnation mold is used for preimpregnating basalt fibers. A quantitative conveying component is mounted on the impregnation mold for conveying the preimpregnated resin to the basalt fibers within the impregnation mold. A cleaning component is mounted on the impregnation mold for cleaning the impregnation mold. This invention achieves stable conveying pressure of the preimpregnated resin, improves the overall impregnation effect, cleans residual preimpregnated resin, avoids oxidation, yellowing, or carbonization of preimpregnated resin accumulated internally over a long period, and ensures continuous production.

The invention discloses a high-strength cellulose acetate material and its application, belonging to the technical field of cellulose acetate materials. The raw materials of the heat-resistant cellulose acetate material include, by mass percentage: 65%-75% of diacetyl cellulose grafted with aryl ether sulfone monomaleimide, 23%-33% of an epoxidized alkyl ester composition of a compound represented by formula 1, and 1%-2% of an antioxidant; diacetyl cellulose grafted with aryl ether sulfone monomaleimide is a liquid crystal polymer, wherein the aryl ether sulfone monomaleimide is a liquid crystal phase. The high-strength cellulose acetate material is a liquid crystal polymer with high mechanical strength.

The invention discloses a laser precision cutting and heat affected zone control method and system for a phosphoric acid fuel cell electrode. The method comprises the steps that an original image of the electrode is obtained, an actual alignment mark is recognized, sub-pixel-level centroid coordinates are calculated through geometric moments, coordinate mapping is conducted on a standard cutting path in combination with a two-dimensional affine transformation model, and a corrected cutting path is generated; in the cutting process, a microscopic image of a laser action area is collected in real time, and a thermal damage index is calculated based on the width of a kerf heat affected zone and an edge carbonization mean value; and the control module dynamically adjusts the cooling wind speed through a PID algorithm according to the deviation between the thermal damage index and a preset threshold value, and triggers a secondary suppression strategy for reducing the laser energy when the wind speed reaches the limit. According to the method, path deviation is solved through visual positioning compensation, cooling and laser parameters are cooperatively adjusted through visual thermal field feedback, and the heat accumulation and carbonization phenomena in phosphoric acid fuel cell electrode machining are effectively restrained.

The invention discloses a preparation method of a liquid-phase oxidized starch-based hard carbon material, the hard carbon material and application of the hard carbon material, and belongs to the technical field of battery materials. Starch, an oxidizing agent and a solvent medium react in a sealed reaction kettle at the temperature of 25-90 DEG C, a reaction product is sequentially subjected to water washing, drying and carbonization, and the hard carbon material is obtained.According to the method, the starch is treated through a liquid-phase oxidation method, the problem of volume expansion occurring in the starch carbonization process can be effectively inhibited, and the yield of the hard carbon material is improved. Meanwhile, fine regulation and control on the growth process of carbon microcrystals are realized, and the obtained hard carbon material has high compaction density and low resistivity, shows excellent sodium storage performance when being used for a sodium ion battery, and has high first-circle coulombic efficiency.

This utility model relates to the field of electronic component technology, and in particular to a surface-mount electronic component that overcomes the problems of existing surface-mount electronic components that may damage circuit boards, have poor soldering to circuit boards, and are not conducive to automated pick-up. The functional ceramic body has upper and lower electrodes on its upper and lower surfaces, respectively. Upper and lower leads are soldered to the upper and lower electrodes and extend from the functional ceramic body. An encapsulation layer covers the functional ceramic body, the upper and lower electrodes, and the encapsulated portion of the upper and lower leads. The portions of the upper and lower leads exposed in the encapsulation layer include a starting segment extending from the functional ceramic body, a downward bending segment from the starting segment, and a horizontal bending segment bending downwards from the downward bending segment towards the bottom of the functional ceramic body. The horizontal bending segment continues to extend and forms a support portion that contacts or tends to contact the bottom surface of the encapsulation layer. The bottoms of the horizontal bending segments of the upper and lower leads are on the same plane, and at least a portion of the horizontal bending segments of the upper and lower leads is the solder joint of the electronic component on the circuit board.

The utility model discloses a kind of high sealing observation windows of cremator, including two I-beam reinforcing plates, the upper and lower ends of two I-beam reinforcing plates are clamped with reinforcing plate, the reinforcing plate is connected by locking mechanism and I-beam reinforcing plate, glass body is installed between two I-beam reinforcing plates and two reinforcing plates, the periphery of glass body is clamped with sealing strip, glass body is composed of nano coating toughened glass, low emissivity film and quartz glass, the sealing strip is sequentially composed of first foamed silica gel layer, ceramic fiber matrix, aerogel layer and second foamed silica gel layer from inside to outside. The utility model can effectively prevent carbonization or cracking of sealing material under high temperature, while composite sealing structure significantly improves sealing performance and durability, in addition, three-layer structure synergistic effect, comprehensively improve the visibility, security and functionality of observation window, realize multifunctional protection.

The present invention relates to a composite negative electrode active material, which comprises: a silicon-based core particle; an outer carbon coating layer formed on the silicon-based core particle; and a single-walled carbon nanotube, wherein the single-walled carbon nanotube is in contact with the outer carbon coating layer and comprises a main body partially separated from the outer carbon coating layer, and the outer carbon coating layer contains 35 wt % to 55 wt % of oxygen therein.

The utility model relates to a double-layer asphalt melting device with side feeding, belongs to the technical field of asphalt melting equipment, and aims to solve the problems that an existing asphalt melting device is high in operation cost, large in occupied space after synergistic improvement and poor in economical efficiency, the double-layer asphalt melting device comprises a shell and two heat conduction oil pipe heating units, the shell is divided into an upper layer area and a lower layer area, the upper layer area and the lower layer area are communicated, the two heat conduction oil pipe heating units are arranged in the upper layer area and the lower layer area in the shell respectively, a plurality of feeding ports are machined in the front side wall of each area, and a sealing door is correspondingly arranged at each feeding port. The sealing door structure located on the upper layer completes opening and closing actions in a pneumatic upturning mode, and the sealing door structure located on the lower layer completes opening and closing actions in a manual mode. The device is mainly used for melting asphalt blocks in the asphalt production process.

The invention provides a halide electrolyte, a preparation method thereof and an electrochemical device, and particularly relates to the technical field of solid-state batteries. The chemical formula of the halide electrolyte is Li < 2 + n > Zr < 1-n > MnCl < 6-x-y > Br < x > I < y >, wherein n is more than 0 and less than or equal to 0.6; 0 < = x < = 6, 0 < = y < = 6, and x + y < = 6; m is a doping element and is selected from one or more of V, Cr, Mn, Fe, Co and Ni, and the preparation method of the halide electrolyte comprises the following steps: uniformly mixing raw materials according to the stoichiometric ratio of the chemical formula of the halide electrolyte, dispersing the raw materials in a solvent, and carrying out wet grinding treatment to obtain wet grinding slurry; carrying out drying treatment on the wet grinding slurry to obtain a halide precursor; and carrying out microwave sintering on the halide precursor to obtain the halide electrolyte. The preparation method can effectively improve the performance and production efficiency of the electrolyte, and can greatly reduce the synthesis cost of the halide electrolyte.

The invention discloses an automatic laser cutting machine and method for nonmetal cutting, and relates to the technical field of laser cutting machines. The automatic laser cutting machine for nonmetal cutting comprises a shell, a three-dimensional five-axis laser cutting machine is installed on the top wall of the shell, and a plurality of inclined air channels are formed in the outer side of the shell in the circumferential direction of a window at equal intervals; the moving-through control device is used for communicating the first inner cavity and the second inner cavity where one window is located and completing waste gas absorption and contact surface cooling, and the filtering device is used for filtering impurities. According to the automatic laser cutting machine and method for non-metal cutting, the supporting shell is matched with a special-shaped piece opening hole through the window, the inner wall is stably supported to prevent collapse and deviation, circumferential uniform cooling and cutting gas dust absorption are synchronously achieved through an inner cavity of the window, a moving cylinder moves to enable a through hole to only communicate with an assembly of a to-be-cut station, the station is rapidly switched, time is saved, and the working efficiency is improved. And airflow is intensively utilized, the equipment energy consumption is reduced, and the stable cold suction effect is ensured.

This utility model discloses a self-lubricating oil seal metal skeleton, including a metal outer skeleton, a sealing lip connected to one side of the metal outer skeleton, a dustproof lip connected to one side of the sealing lip, and a lubrication mechanism provided inside the metal outer skeleton. The lubrication mechanism includes an oil storage ring located inside the metal outer skeleton, an oil outlet on one side of the oil storage ring, and an oil guide channel on the sealing lip, with the oil outlet communicating with the oil guide channel. This utility model forms a complete built-in lubrication system by setting an oil storage ring inside the metal outer skeleton and providing an oil guide channel communicating with it on the sealing lip. The oil storage ring can pre-store an appropriate amount of lubricating oil. During equipment operation, the lubricating oil is slowly released through the oil outlet and continuously transported to the friction interface between the sealing lip and the shaft through the oil guide channel, effectively establishing and maintaining a lubricating oil film. This design significantly reduces dry friction during startup and low-speed operation, lowers the coefficient of friction, and avoids lip wear caused by insufficient lubrication.

The invention discloses plasma low-temperature tumor ablation equipment in the technical field of surgical equipment, which comprises a main control module, a plasma operation module and a radio frequency ablation module, and is characterized in that the main control module, the plasma operation module and the radio frequency ablation module are integrated in a shell; unified management is facilitated, meanwhile, the multi-device operation problem is solved, clinical operation of doctors is facilitated, and the existing multi-device purchasing cost is effectively reduced; through the arrangement of the peristaltic pump, the flow speed and the like can be adjusted through a human-computer interaction interface, and cold saline water injection or cold water scalpel head internal circulation can be carried out.

The building landscaping waste treatment device comprises a waste treatment machine body, a feeding opening is fixedly formed in the top of the outer wall of the front face of the waste treatment machine body, and a discharging opening is fixedly formed in the bottom of the outer wall of one side of the waste treatment machine body; an air inlet is formed in one side, far away from the discharge hole, of the waste treatment machine main body. And by arranging the rotating blades, a large amount of wood chips are not accumulated any more, so that the drying time of the wood chips in different layers is close to each other, and carbonization caused by overlong drying time of the wood chips on the surface can be prevented.

The application relates to the technical field of simmering equipment, and discloses a simmering device for animal oil production, which comprises a main body structure, a simmering structure and a driving structure, the simmering structure is movably arranged on the main body structure, the driving structure is fixedly arranged on the main body structure, and the driving structure is connected with the simmering structure. The application has the beneficial effects that the transmission structure is simple and reliable, the heating is more uniform, local overheating, scorching and carbonization are effectively avoided, the oil quality and the oil yield are obviously improved, the support and the inclination are flexibly adjustable, the heating effect is strengthened, the overall heating production efficiency is improved, the oil is smoothly discharged, automatic solid-liquid separation is realized, residues are automatically collected, cleaning is convenient and sanitary, the manual strength is reduced, and the sanitary standard is improved; the heating assembly can be replaced, the maintenance cost is low, and the integrated design is high in production continuity.

The present invention provides a preparation process of heptamethyltrisiloxane, wherein the catalyst used in the preparation process is formed by using a porous carbon material as a carrier to load an active component; the active component at least comprises γ-Fe2O3 and a sulfonic acid group, and the molar ratio of the two is 1:18-20. The preparation process of heptamethyltrisiloxane provided by the present invention is: using high hydrogen silicone oil as a raw material, under the action of a capping agent and the above-mentioned catalyst, a polyreaction is carried out at 40-95°C to obtain it. A new catalyst is used in the preparation process of heptamethyltrisiloxane of the present invention, and the catalyst has the advantages of high catalytic efficiency, low loss of active substances, and many reuse times. The heptamethyltrisiloxane obtained by the preparation process has high purity and is easy to separate.

This utility model relates to the field of polymerization tower technology, and in particular to a top-mounted magnetically stirred nylon polymerization tower. The top-mounted magnetically stirred nylon polymerization tower includes a welded integral tower body and a top-mounted magnetic stirrer. The tower body has a flanged end cap, and a bearing seat is sealed to it. The magnetic stirrer is driven by magnetic coupling between an outer rotor and an inner rotor, and is isolated between the inner and outer rotors, isolating the tower body from the outside. A stirring shaft connects the inner rotor to the stirring paddle. The stirring paddle contains at least two stages of rectangular flat blades, with the blades forming an angle of 45° to 60° with the central axis, and its length being 25% to 30% of the nominal diameter of the tower body. This top-mounted magnetically stirred nylon polymerization tower can increase the heat exchange area, uniformly measure the material reaction temperature, reduce material adhesion to the walls and carbonization blockage, reduce the impact of bubbles trapped in high-viscosity melts, improve devolatilization efficiency, and enhance product quality and production efficiency without increasing leakage points.