926results about How to "Avoid cracking" patented technology

The invention discloses a yielding crystallizer for an electroslag smelting casting three-dimensional variable curved surface casting and an electroslag smelting casting method, and belongs to the field of electroslag smelting casting. The receding crystallizer comprises a crystallizer body formed by combining a plurality of crystallizer blocks, internal molded surfaces of the crystallizer body are combined to form a crystallizer cavity, and the crystallizer cavity is used for containing molten metal and forming a casting with a three-dimensional variable curved surface; the receding structure is arranged on at least one crystallizer sub-block and is configured to allow the crystallizer sub-block to move in the preset direction in the solidification and shrinkage process of the casting so as to avoid shrinkage deformation of the casting; and the slag stopping structures are arranged between the adjacent crystallizer blocks and are used for sealing gaps generated by displacement after the crystallizer blocks are subjected to yielding displacement, so that slag leakage is prevented. The receding crystallizer can automatically receding when hindering deformation of a casting, space needed by metal shrinkage is provided in the electroslag casting process, and the finished product quality of the casting in the complex shape is improved.

The utility model discloses a self-stress compensation type ultra-long concrete anti-crack supporting device, and belongs to the technical field of supporting devices, the self-stress compensation type ultra-long concrete anti-crack supporting device comprises a bottom plate, and an H-shaped steel frame is arranged above the bottom plate; the fixing cylinders and the telescopic rods are arranged to form the telescopic supporting legs, the two telescopic supporting legs form a main body supporting system, the main body supporting system is matched with the rigid supporting characteristic of the H-shaped steel frame to effectively disperse the load during concrete pouring, the supporting mechanisms are arranged, and therefore the telescopic rods can synchronously support the two sides of the H-shaped steel frame, and the concrete pouring efficiency is improved. The two telescopic rods are fixedly connected together through the cross beam to form a whole, so that the hydraulic jacking mechanism drives the cross beam to achieve height adjustment of the main body supporting system, accurate control is achieved, stress uniformity is guaranteed, and the stability of the supporting system is improved. And the situation that self-stress distribution in the structure is changed due to uneven stress before the concrete structure is not completely hardened is avoided, the construction quality is ensured, and cracks are prevented.

The invention discloses a microalloyed high-toughness martensitic stainless steel cutter head as well as a preparation method and a preparation mold thereof. Stainless steel comprises the following components in percentage by weight: 0.3%-0.7% of C, 0.3%-1.0% of Si, 0.5%-1.5% of Mn, 16%-18.5% of Cr, 1%-2% of Ni, 0.3%-0.8% of Mo, 0.1%-0.35% of V, 0.1%-0.25% of Nb, less than or equal to 0.02% of S, less than or equal to 0.02% of P and the balance of Fe. Firstly, raw materials are smelted into molten iron; then adding a deoxidizing agent and precoated sand into the molten iron for molding, and performing sand mold casting and pouring to obtain a cutterhead blank; carrying out heat treatment on the cutter head blank; and finally, shot blasting and polishing are conducted on the cutterhead subjected to heat treatment. The martensitic stainless steel cutterhead has a metallographic structure which takes a martensitic structure as a main structure, takes austenite as an auxiliary structure and dispersedly distributes CrC, VC and NbC particles, the hardness of the martensitic stainless steel cutterhead is 40-45 HRC, the impact toughness of the martensitic stainless steel cutterhead reaches 92-95 J / cm < 2 >, the abrasion resistance of the cutterhead is longer, the service life of the cutterhead is longer, and the abrasion loss of the martensitic stainless steel cutterhead is reduced by 70% compared with a cutterhead without alloy elements.

According to the silicon carbide / diamond multi-layer composite film and the preparation method thereof, a polycrystalline silicon carbide matrix in the multi-layer composite film is a bottom layer, and the multi-layer composite film has high strength, high rigidity, high heat conductivity and oxidation resistance; the components of the gradient SiC-C transition layer gradually change from pure SiC to rich C-SiC and then to diamond-like carbon, and the gradient SiC-C transition layer is used for slowly releasing thermal stress and enhancing binding force; the nanocrystalline diamond is used as the top layer and has high hardness, low friction coefficient, particle scouring resistance and high infrared transmittance; the silicon carbide / diamond multi-layer composite film is obtained through a chemical vapor deposition method, the process is mature, and the silicon carbide / diamond multi-layer composite film has good heat conduction performance and infrared transmittance and is suitable for infrared guidance systems with extremely severe working environments, such as optical materials of fairings, optical windows and the like.

A battery unit and processing equipment relate to the field of batteries, the battery unit comprises a plurality of back contact battery strings and a confluence assembly, the plurality of back contact battery strings are arranged in a first direction, each back contact battery string is provided with a battery piece and a solder strip extending along the first direction, the solder strip is provided with a main body section and a connecting section, the main body section is arranged on the battery piece, and the connecting section is arranged on the main body section. The connection section is connected with the main body section, the confluence assembly comprises a first confluence assembly and a second confluence assembly, the first confluence assembly is connected with the two adjacent back contact battery strings, and in the thickness direction of the battery unit, the connection sections of the two adjacent back contact battery strings are connected to the top surface of the first confluence assembly, and the second confluence assembly is connected with the top surface of the second confluence assembly. The battery pieces are all located on the bottom face of the first confluence assembly, the second confluence assembly is connected with the back contact battery string located on the edge, and the projection of the second confluence assembly in the thickness direction of the battery unit is located in the range of the battery pieces. According to the technical scheme, the yield of the battery is ensured.

The invention discloses a micro-channel reactor and micro-channel reaction equipment, the micro-channel reactor comprises a reaction plate, a support transition plate and a heat exchange plate which are connected in a laminated manner, grooves are processed in the reaction plate to form micro-reaction channels, grooves are processed in the heat exchange plate to form heat exchange channels, and the support transition plate is separated between the reaction plate and the heat exchange plate; the micro-reaction channel comprises at least two micro-channel units and a middle flow channel connected with the adjacent micro-channel units, each micro-channel unit comprises a flow channel inlet, a flow channel outlet and a heart-shaped mixing cavity, an arc-shaped flow baffle and at least one turbulent flow column are arranged in the heart-shaped mixing cavity, the concave side of the arc-shaped flow baffle faces the flow channel inlet, and the convex side of the arc-shaped flow baffle faces the turbulent flow column. And the turbulent flow column is arranged between the arc-shaped flow baffle and the flow channel outlet. Through cooperation of the heart-shaped mixing cavity, the arc-shaped flow baffles and the turbulent flow columns, the particle suspension rate and the mass transfer capacity of the micro-reaction channel are effectively improved, then the reaction efficiency is improved, and the device can be used for achieving continuous preparation of nano-drugs.

The utility model relates to a kind of A-shaped frame anti-crack casting model for mine car in sand casting technology field, include A-shaped frame body, the A-shaped frame body includes two head portion integrated connection's inclined strut leg, the first muscle plate is connected between the inner corresponding face head end of two inclined strut legs, the head portion integrated connection's two side surfaces of two inclined strut legs are respectively provided with first riser piece and second muscle plate, the long strip tie between the inner corresponding face tail end of two inclined strut legs is connected, the long strip tie middle part is provided with the gate piece in the same direction with first riser piece, the tail end of two inclined strut legs is equipped with the second riser piece in the same direction with first riser piece;The casting model can avoid casting defects.

The basement outer wall crack controllable induction structure device disclosed by the utility model has the advantages that the L-shaped wall-hanging frame and the side frame are combined and fixed, stable constraint is formed on the wall body, the crack is guided to generate in the preset area, and the crack direction is accurately controlled through the angle adjustment of the crack induction mechanism.

This invention belongs to the field of casting cutting technology, and mainly relates to a cutting method for preventing cracking of nickel-based superalloy castings. It changes the cutting process and process control parameters in existing technologies, providing a complete and effective cutting method. It strictly controls the parameter values ​​of key nodes in each cutting step, avoiding the casting from passing through the brittle phase precipitation temperature range, improving the casting's plasticity and toughness, reducing stress, and preventing crack formation. The casting undergoes annealing after molding to eliminate casting stress, providing a better cutting condition for subsequent riser cutting. The cutting method provided by this application effectively prevents casting cracking during cutting, making casting manufacturing quality controllable and reducing rework costs. After annealing, the elongation is significantly increased by about 500%, and the plasticity is significantly improved, effectively reducing the risk of cracking.

The utility model relates to the field of arc welding room ventilation, and discloses an arc welding room ventilation assembly which comprises a welding room used for supporting, a protruding plate of the welding room is fixedly connected with a ventilation air pump, the output end of the ventilation air pump is fixedly connected with an air inlet pipe, and the inner side of the air inlet pipe is fixedly connected to the left side of the welding room. An exhaust pipe is fixedly connected to the left side of the top end of the welding room, an exhaust pump is fixedly connected to the outside of the exhaust pipe, a cooling box is fixedly connected to the position, located on the right side of the exhaust pipe, of the top end of the welding room, a cooling screw pipe is fixedly connected to the right side of the exhaust pipe, and a discharging pipe is fixedly connected to the bottom end of the cooling screw pipe. A water flow cooling assembly is installed in the cooling box and used for achieving cooling of high-temperature gas. According to the utility model, the high-temperature waste gas treatment effect of the device is improved, the pipeline is prevented from cracking due to high temperature, the stability of the device in the exhaust process is improved, and waste particles are conveniently treated.

The utility model relates to a kind of rabbet strips for wooden door leaf, including rabbet strip main part, limiting piece and protective strip, the height of rabbet strip main part is adapted with door leaf, the rabbet strip main part includes first baffle and second baffle, the first baffle side and the second baffle side are connected;The limiting piece is placed on the first baffle or second baffle, the door leaf corresponding position is provided with the slot for containing the limiting piece;The protective strip is placed on the side of the first baffle away from the second baffle, and the protective strip is connected with the side of the first baffle;And / or, the protective strip is placed on the side of the second baffle away from the first baffle, and the protective strip is connected with the side of the second baffle.The utility model installs baffle on the surface of door leaf and wraps around edge strip, avoids the problem that edge strip is cracked due to long-term extrusion with door frame sealing strip.

The utility model relates to a graphite crucible belongs to high temperature smelting equipment technical field. Among them, graphite crucible includes: the crucible body has the first wall body and second wall body with the wall thickness is formed, and the first wall body is located the outside of second wall body, the top of second wall body is lower than the top of first wall body, to make second wall body and first wall body form the step between, the cover body, cover is established on the step, among them, the recess is provided on the first wall body, and the recess is along the circumference of the crucible body and sets up, and the depth of recess is greater than 0 and is less than or equal to 10. Through the recess along the circumference of the crucible body and sets up, to make the gripper of mobile equipment when the graphite crucible is clamped, the gripper can be held at the recess, to realize the quick positioning of the crucible body, simultaneously, still can make at least partial gripper can be housed in the recess, with the recess forms the card and holds, avoids the sliding between the gripper and the crucible body, to avoid the occurrence of the fall of the crucible body, improves the service life of the crucible.

The invention relates to a high-plasticity GH4141 alloy cold-drawn bar with a uniform structure and a preparation method of the high-plasticity GH4141 alloy cold-drawn bar, belongs to the field of high-temperature alloy materials, and solves at least one of the problems that in the prior art, a GH4141 bar is poor in grain size uniformity, and a fastener is poor in performance stability, low in forming qualification rate and the like due to insufficient plasticity. The preparation method of the high-plasticity GH4141 alloy cold-drawn bar with the uniform structure comprises the steps that a hot-rolled GH4141 alloy bar blank is subjected to solution treatment, and then first-time cold drawing, first-time intermediate annealing treatment, second-time cold drawing, second-time intermediate annealing treatment, finished product cold drawing and finished product annealing treatment are sequentially carried out. According to the method, the plasticity is remarkably improved while the strength of the GH4141 alloy cold-drawn bar is guaranteed, and the upsetting qualification rate of a fastener and the product performance consistency are effectively improved.

The application discloses a full-wrapping concrete truss structure and a construction method thereof, and belongs to the technical field of building structures. The full-wrapping concrete truss structure comprises a steel pipe truss assembly arranged between a plurality of steel plates, a wrapping assembly arranged outside the steel pipe truss assembly, and a concrete layer arranged outside the wrapping assembly. The construction method comprises the following steps: S1, preparing a top chord, a bottom chord, a vertical rod and a horizontal rod, wrapping the rods with a reinforcing mesh and welding to obtain a steel pipe truss shell; S2, arranging a diagonal web member assembly inside the shell and arranging a connecting mesh outside the shell to form a steel pipe truss monomer; S3, bolt connecting a plurality of monomers and bolt connecting the steel plates and the monomers at edges to form a steel pipe truss structure; and S4, vibrating the steel pipe truss structure after concrete partition pouring to obtain the full-wrapping concrete truss structure. The application can realize full wrapping of the steel pipe, ensure that the concrete layer is tightly bonded with the steel pipe, and improve the stability and safety of the structure.

The utility model discloses a kind of isostatic pressing graphite baking furnace protection devices for semiconductor, comprising: mandrel, rotary drum and baffle ring, the mandrel concentrically arranged in the inside of rotary drum, the outer wall of rotary drum is recessed and is provided with the length direction of rotary drum along extension's insertion slot, the isostatic pressing graphite bar stock can be rollably arranged in insertion slot, the baffle ring is spaced on the outer wall of rotary drum and is set in the length direction of rotary drum.The semiconductor isostatic pressing graphite baking furnace protection device described in the utility model can be switched with the rotation of rotary drum, and the flame of combustion device is recycled to carry out baking, the isostatic pressing graphite bar stock is rolled in insertion slot due to gravity, improve heating uniformity, avoid the cracking of isostatic pressing graphite material.

This invention discloses a method for preparing a large round billet for continuous casting of forged cold-rolled roll sleeves, comprising: controlling the composition system, wherein the chemical composition of the raw material steel is: C: 0.65-0.75%, Si: 0.25-0.40%, Mn: 0.35-0.50%, P≤0.020%, S≤0.020%, Cr: 1.90-2.10%, Ni: 0.30-0.45%, Mo: 0.20-0.40%, V: 0.05-0.10%; and controlling the continuous casting process parameters, wherein the superheat is controlled within a certain range. The casting temperature is maintained between 15 and 35°C, the casting speed is kept stable at 0.24 ± 0.01 m / min, the crystallizer water flow is controlled at 3700 L / min, and the secondary cooling water flow in the crystallizer is controlled at 0.12 L / Kg. During continuous casting, a 200 A / 2.5 HZ electromagnetic stirring of the casting flow and a 500 A / 1.2 HZ strong end electromagnetic stirring are used. The heat treatment process parameters for the continuously cast round billets are controlled as follows: red-charging annealing of the continuously cast round billets, furnace charging temperature ≥ 400°C, heating rate ≤ 100°C / h, holding at 730°C for ≥ 15 h, furnace cooling to 400°C, and air cooling upon exiting the furnace. This invention ensures the hardness and wear resistance of the cold-rolled roll sleeves while improving toughness and machinability, avoiding surface cracking and internal cracking of the roll sleeves during the casting and forging processes, ultimately achieving high-efficiency production and long service life of the roll sleeves.

This invention belongs to the field of cable technology, specifically a thin-walled oxygen-barrier high-temperature resistant cable, comprising a conductor core and a thin-walled outer sheath. The conductor core has a high-temperature resistant insulation layer made of polyetheretherketone (PEEK) composite material on its outer side. Between the high-temperature resistant insulation layer and the thin-walled outer sheath, from the inside out, are sequentially arranged a ceramicized oxygen barrier layer and a flame-retardant reinforcement layer. The ceramicized oxygen barrier layer is a nano-modified ceramicized silicone rubber layer with a thickness of 0.05–0.15 mm, including an outer layer doped with silicon carbide whiskers and an inner layer doped with zinc borate. This invention prepares an ultra-thin ceramicized layer through gradient doping, resolving the contradiction between thin-walled design and oxygen barrier properties, and effectively improving the interfacial peel strength. This reduces the cable's outer diameter and bending radius, making the cable lightweight and suitable for high-dynamic applications.

This utility model relates to the field of valve body technology, and in particular to an impact-resistant high-temperature and high-pressure valve body, comprising a valve body and an impact-resistant plate. The inner wall of the valve body has an inlet chamber and a drain chamber, which are connected. A limiting groove is formed in the inner wall of the inlet chamber, and the impact-resistant plate abuts against the limiting groove, with its outer peripheral wall in sliding contact with the inner wall of the limiting groove. Multiple flow holes are formed on the outer wall of the impact-resistant plate, with the diameter of the flow holes increasing from the middle to both ends. In this utility model, by setting up the impact-resistant plate, the impact force of the fluid is transferred from the inner wall of the valve body to the impact-resistant plate, avoiding direct impact on the valve body. The design of the flow holes with increasing diameter from the middle to both ends reduces the flow velocity and disperses the pressure when the fluid passes through, further reducing the impact of the fluid on the valve body, preventing fatigue, wear, and cracks in the valve body material, extending the service life of the valve body, and ensuring safe operation of the equipment.

The invention relates to the field of refractory materials, in particular to a high-strength refractory material and a preparation method thereof, which are used for solving the problem that the existing traditional refractory material is low in strength and difficult to meet the high-standard requirement of modern industry on equipment. The high-strength refractory material comprises the following components: silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and a phosphorus-containing phenyl multi-epoxy-group binding agent, according to the preparation method, silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide and titanium diboride are taken as main raw materials, the main raw materials are endowed with excellent mechanical properties, and after a phosphorus-containing phenyl polyepoxy binding agent is added, the mechanical properties of the main raw materials can be further remarkably improved, so that the prepared refractory material has the characteristics of high strength, high temperature resistance and the like. The composite material shows high durability and reliability in a high-temperature environment, and is suitable for thermal protection in the high-temperature environment and internal construction of high-temperature equipment.

The present application relates to the technical field of bamboo fiber composite material, in particular to a purification preparation method of bamboo fiber reinforced natural polymer composite material. The bamboo raw material is crushed and treated by steam explosion to obtain primary bamboo fiber; the primary bamboo fiber is sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment to obtain purified bamboo fiber; the purified bamboo fiber is treated in a tannin acid solution to form a polyphenol interface layer on the surface thereof; and a solution containing polyvalent metal ions is added to the treated bamboo fiber to form a coordination cross-linking interface layer on the surface of the bamboo fiber. The present application constructs a stable interface layer between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, significantly improve the tensile strength, bending strength and shear strength of the composite material, and solve the problem of weak interface and easy delamination of traditional natural composite materials.

The utility model provides a kind of multistage anti-seismic explosion-proof valve and manufacturing method.The multistage anti-seismic explosion-proof valve of the utility model includes the body of sheet shape, the body edge is explosion-proof valve ring, the middle part of the body is thinning area and the thickness size of thinning area is less than the thickness size of explosion-proof valve ring, the reinforcing rib with the strength of the place can be improved is had at thinning area, the score with annular recess is had on thinning area close to its edge, annular recess buffer groove is had between thinning area and explosion-proof valve ring and buffer groove position explosion-proof valve ring and score, the reinforcing rib includes reinforcing frame in the middle part of thinning area and reinforcing strip at the both ends of frame body.The multistage anti-seismic explosion-proof valve of the utility model can be stably welded and installed on battery cover plate.

This invention discloses a novel bulletproof steel plate with a thickness of 12-35mm, comprising the following chemical composition by weight percentage (unit: wt%): C: 0.25-0.28, Si: 1.20-1.40, Mn: 1.50-1.60, P: ≤0.007, S: ≤0.001, Cr: 0.50-0.60, B: 0.0015-0.0023, Ti: 0.03-0.04, with the remainder being Fe and residual elements; it eliminates the need for the addition of Ni, Mo, and rare earth elements, thus reducing alloy costs. In terms of production process, clean steel smelting is used to control the P and S content, thereby improving impact toughness; pressure quenching is employed with multi-point pressure application and reasonable distribution of water volume and pressure in each section of the high-pressure zone to achieve uniform cooling and flatness of the steel plate; furthermore, low-temperature tempering is used to effectively eliminate the influence of residual internal stress in the steel plate and improve the subsequent processing performance of the steel plate, such as cutting and welding. The resulting bulletproof steel has a tensile strength of 1700-1800MPa, a surface hardness of >500HBW, and an impact energy of >40J at -20℃, which fully meets the requirements for use of bulletproof steel plates.

This invention discloses an artificial aggregate prepared using desulfurization solid waste, its preparation method, and its application, belonging to the field of solid waste resource utilization technology. The preparation method includes the following steps: ball milling desulfurization slag to obtain desulfurization slag powder; low-temperature pyrolysis treatment of waste incineration fly ash to obtain pretreated waste incineration fly ash; mixing desulfurization ash, desulfurization slag powder, and pretreated waste incineration fly ash to obtain a raw material mixture; adding water to the raw material mixture and pelletizing to obtain aggregate particles; subjecting the aggregate particles to air curing and mineralization curing sequentially to obtain the final product. This invention also discloses the artificial aggregate prepared by the above method and its application. The artificial aggregate prepared using desulfurization solid waste of this invention has high compressive strength and stable ion storage, which can solve the problems of low strength and high dependence on admixtures in existing coal ash-based aggregates, and has broad application prospects.

The utility model discloses an overwater cast-in-place simply supported beam dismantling device which is suitable for the field of bridge dismantling. Comprising a buoyancy tank platform for providing overwater operation support and transportation in the overwater cast-in-place simply supported beam dismantling process, an SPMT module transport vehicle capable of adjusting the height of a vehicle body, a bracket with the bottom capable of allowing the SPMT module transport vehicle to enter, and a hydraulic lifting device with the height capable of being increased to a preset height so that the to-be-dismantled cast-in-place simply supported beam can be separated from a support. Compared with an existing blasting device or a floating crane dismantling device, the device has the advantages that modular design and assembly are efficient, the device can be repeatedly used for other bridge engineering, the construction cost is low, the whole beam body is dismantled through hydraulic synchronous jacking, chippings are prevented from polluting water, and environmental protection and construction safety are both achieved.

The invention discloses a micro-vibration control construction process for a grating vibration isolation foundation, and relates to the technical field of building construction. Comprising the following steps: S1, measuring and positioning: measuring and releasing sideline control piles of each shock insulation pier and a sand-gravel cushion layer; s2, construction of a graded gravel cushion layer; s3, compaction coefficient detection; s4, paying-off is conducted on the bottoms of the shock insulation piers, wherein the sideline control point of each shock insulation pier is measured and paid off; s5, side formwork installation and steel bar binding, wherein the distance between the vibration isolation pier and the equipment walkway foundation is 10 cm, a foam polyethylene plate with the thickness of 10 cm is adopted as the side formwork, and the side formwork and the steel bars are installed, bound and formed together; s6, mass concrete pouring and temperature control, wherein layered pushing type continuous pouring is adopted, and the thickness of each layer does not exceed 50 cm; s7, concrete curing; and S8, buffer seam treatment. The compaction graded gravel cushion layer is arranged as a vibration isolation filtering layer, and the large-scale independent vibration isolation pier body is combined, so that double isolation of earthquake dynamic response and environmental vibration is effectively realized, and stable operation of a precise instrument is ensured.

This utility model relates to the field of road and bridge construction technology, and in particular to a fixing structure for repairing road and bridge cracks. It includes a cylinder and a road surface. A crack groove is provided at the crack in the road surface for placing the cylinder. A top groove is formed above the crack groove. A vertically placed support is slidably installed inside the cylinder. A waterproof plate is fixedly connected to the top of the support after it slides through the cylinder. An inner cavity is formed at the top of the cylinder. Connecting rods are rotatably connected to both sides of a section of the support located in the inner cavity. A pull rod is rotatably connected to the end of the connecting rod away from the support. A fixing rod is provided at the end of the pull rod away from the connecting rod. This application improves construction efficiency and reduces difficulty through convenient adjustment of the fixing structure. Furthermore, the design of barbs and waterproof grooves enhances structural stability and waterproof performance. The mechanical structure under stress also prevents further cracking, ensuring the quality of the repair work in terms of construction efficiency and long-term stability of the repair effect.

The invention provides a square inner rotor axial flow fan, and belongs to the technical field of fans. The axial flow fan solves the problems that due to the fact that the shaft connecting part of an impeller and a motor of an existing axial flow fan is in high-speed operation for a long time, the connecting section of the impeller and the motor is abraded, transmission stability is affected, and the connecting section is prone to cracking. The square inner rotor axial flow fan comprises an impeller composed of blades and a shaft seat, a machine shell is arranged outside the impeller, the end of the shaft seat is provided with an inner threaded hole and connected with a connecting sleeve in a threaded mode, a motor with a machine shaft is further arranged in the machine shell, and the connecting sleeve is connected with the machine shaft through a long-rod nut and screw assembly. The device has the advantages of being easy to disassemble and assemble, efficient and stable in transmission and capable of preventing cracking.

This invention belongs to the field of membrane separation technology, specifically relating to a method for preparing a polytetrafluoroethylene (PTFE) composite membrane. The preparation method includes: (1) dissolving a spinning aid, a barium source, a titanium source, and a manganese source in a composite solvent, and then electrospinning to obtain precursor fibers; subsequently, blending the precursor fibers with a grain refiner, and heat-treating to obtain doped ferroelectric fiber bundles; (2) further polymerizing organic acids, inorganic acids, conductive fillers, and conductive polymers with monomers and oxidants to finally obtain a conductive polyaniline composite; (3) incorporating Mxene and the conductive polyaniline composite into an aqueous PTFE emulsion, and then further incorporating the doped ferroelectric fiber bundles and stirring to obtain a suspension; the suspension is then coated, post-treated, and kept warm to obtain a PTFE composite membrane. This invention improves the long-term fouling resistance of the PTFE membrane by doping the doped ferroelectric fiber bundles, the conductive polyaniline composite, Mxene, and PTFE.

The present application relates to the technical field of binder, especially to a binder suitable for refractory material and its preparation process and application. The binder suitable for refractory material is prepared from the following raw materials in parts by weight: 30-40 parts of dispersible sulfonated starch ether, 20-30 parts of naphthalene sulfonate sodium formaldehyde condensate, 3-5 parts of hydroxypropyl methyl cellulose, 5-10 parts of sodium bentonite, 3-5 parts of fumed silica and 1-3 parts of polyvinyl alcohol. The main raw material of the binder of the present application is also added with dispersible sulfonated starch ether prepared from the following raw materials and preparation process. When the dispersible sulfonated starch ether is used together with the above-mentioned raw materials, firstly, the strength of the refractory material product can be improved; secondly, when the binder is added to the refractory material for molding, the cracking of thick-gauge refractory material during drying or sintering can be avoided, and the refractory material product prepared has fewer cracks at the edges and corners.