60results about How to "Guaranteed mechanical strength" patented technology

The application relates to the field of adsorbents, and discloses a LiLSX molecular sieve adsorbent and a preparation method thereof. The method comprises the following steps: 1) sequentially performing molding treatment, first drying and first calcination on a mixture of kaolin and NaLSX molecular sieve powder to obtain a first calcination product; 2) performing pre-wetting treatment on the first calcination product to obtain a pre-wetting product; 3) contacting the pre-wetting product with alkali and a silicon source or contacting the pre-wetting product with alkali and an aluminum source in the presence of water to obtain a contact product; 4) performing second drying and second calcination on the contact product to obtain a second calcination product; and 5) performing lithium ion exchange on the second calcination product by using an exchange solution containing lithium ions, and the amount of the NaLSX molecular sieve powder is 85% or more in weight based on the total weight of the mixture. The method can make the prepared LiLSX molecular sieve adsorbent have excellent adsorption performance and mechanical strength.

This utility model discloses a conical installation device for a cartridge filter in an air conditioning unit. The device comprises a top disc, hexagonal bolts, diagonal support rods, fixing rods (in three lengths), internal hexagonal screws, flat washers, and spring washers. This utility model uses a specialized tooling mold for positioning. The diagonal support rods, composed of three round steel pipes arranged in an isosceles triangle and welded into a conical structure, are finished with hexagonal bolts at the ends and secured with a handle locking device. The filter cartridge can be disassembled and assembled without any special tools. This solves the problems of deformation and air leakage caused by insufficient installation strength in cartridge filters, while also shortening installation and disassembly time, ensuring the air conditioning unit can be put into use quickly. It is particularly suitable for air conditioning systems in cigarette factories, welding workshops, and other similar fields.

This invention relates to an adsorption tower and a gas nano-purifier. The adsorption tower includes an outer tube and an inner tube coaxially arranged within the outer tube. The outer tube has a first outlet on its wall. The inner tube includes an inlet section, an adsorption section, and a dust removal section connected sequentially from bottom to top. The inlet section has an inlet on its wall. The adsorption section is filled with adsorbent, and a first filter and a second filter are respectively provided at the connection points between the adsorption section and the inlet and dust removal sections. At least a portion of the sidewalls of the dust removal section is configured as a filter layer. Under purification conditions, the high-pressure gas to be treated enters the inner tube through the inlet, passes sequentially upwards through the adsorption and dust removal sections, enters the annular gap between the inner and outer tubes via the filter layer, and is discharged from the first outlet. Through this configuration, using a tube-in-tube structure with the outer and inner tubes coaxially arranged, the integration of the equipment is improved and its volume is reduced, achieving multi-stage purification of gas within a single component, including diffusion, deep adsorption, and precision dust removal.

The application discloses a wire outlet terminal suitable for a dry type variable winding and wrapped by an elastic insulator, which comprises a copper nut and a clamping plate. The copper nut is in a column shape and comprises a quadrangular body and a cylinder body. The end of the cylinder body is connected with a wire outlet head of the variable winding, thereby forming the wire outlet terminal of the variable winding. The clamping plate is provided with a square hole in the middle. The quadrangular body of the copper nut is embedded into the square hole, so that the copper nut is fixed on the clamping plate. After the copper nut is fixed, the clamping plate is fused with the elastic insulator as a whole. The application can strengthen and adapt to the elastic insulator wrapped winding.

The application relates to the technical field of forestry seedling raising and ecological restoration, and discloses a root guiding type full-biodegradable tree planting bag based on hybrid material modification and application, the tree planting bag is an integrally injection molded structure, the inner wall is provided with vertical root guiding edges, and the bottom is provided with a cross-shaped easy-to-crack line; the tree planting bag is longitudinally divided into an upper structure area and a lower degradation promoting area. The upper part is composed of PBAT / PLA and hybrid materials and has high strength and weather resistance; the lower part is composed of PBAT / PPC, hybrid materials and plant fibers and has moisture absorption and rapid degradation characteristics. The hybrid material is a composite in which nano-hydroxyapatite grows in situ on the surface of attapulgite. Through the synergy of the longitudinal gradient material and the physical root guiding structure, long-term shape retention during seedling raising and rapid disintegration of the bottom after planting are realized, the problems of seedling taproot and degradation lag are solved, the degradation products can adjust the pH value of the rhizosphere soil and provide phosphorus and calcium nutrition, and the afforestation survival rate is improved.

The application provides an electric core tray and an electric core transportation device, which are used for improving the strength of the electric core tray, avoiding failure of the electric core tray when the electric core tray bears the electric core, and reducing cost waste. The electric core tray comprises a bottom plate, a bearing part and a plurality of first limiting columns. The bearing part and the first limiting columns are both mounted on the same side of the bottom plate. The bearing part is used for bearing the electric core. The mechanical strength of the bearing part is less than the mechanical strength of the bottom plate. In a first direction, the plurality of first limiting columns are respectively located on opposite sides of the bearing part and are used for limiting the electric core. The first direction is parallel to the transportation direction of the electric core tray.

The invention discloses a tin-zinc-copper powder ultrafine powder batch preparation process, and relates to the technical field of metal powder preparation, and the tin-zinc-copper powder ultrafine powder batch preparation process comprises the following steps: dissolving tin salt, zinc salt and copper salt in deionized water, adding a complexing agent, and uniformly mixing to obtain a mixed metal salt aqueous solution; dissolving a rosin-based polyamine hyperbranched dispersant in an organic solvent to serve as an oil phase; slowly adding a mixed metal salt aqueous solution into the oil phase, and uniformly dispersing to obtain a water-in-oil microemulsion system; dropwise adding a reducing agent solution, and continuously carrying out heat preservation reaction for 0.5-3 hours after dropwise adding is finished, so as to obtain slurry containing alloy particles; and carrying out demulsification treatment, centrifugal separation, repeated washing and drying to obtain the surface-modified tin-zinc-copper superfine powder. Superfining of particles is achieved through confinement growth, synchronous co-deposition of multi-component elements is guaranteed, a homogeneous alloy phase is formed, component segregation is avoided, and a protective layer formed on the surface of the powder in situ endows the material with excellent oxidation resistance and good weld-aid wettability.

The invention discloses an anti-aging and anti-electromagnetic shielding cable and a preparation method thereof, and belongs to the field of high voltage and the technical field of materials, the anti-aging and anti-electromagnetic shielding cable structurally contains a polyurethane-polyethylene copolymer and a flame-retardant and anti-electromagnetic sheet composite carrier, contains a polyurethane chain segment which is connected with a polyethylene main chain through a covalent bond, has no interface separation risk, and has good anti-aging and anti-electromagnetic shielding effects. Polyethylene is resistant to acid, alkali and salt mist, a carbamate group in a polyurethane chain segment can capture free radicals generated by photooxidation and thermal oxidation of polyethylene, aging is delayed from the molecular level, and the flame-retardant anti-electromagnetic sheet composite carrier endows the cable with good aging resistance and anti-electromagnetic shielding characteristics; the lamellar structure of the sheet-shaped carrier can block heat transfer and combustible volatilization, and the lamellar structure and the sheet-shaped carrier synergistically improve the flame-retardant efficiency; the introduction of the flaky composite carrier not only endows functional characteristics, but also can be used as a rigid reinforcement phase, so that the wear resistance and the extrusion resistance of the cable are improved, and the loss of the cable in the dragging and construction processes is reduced.

The utility model discloses a monitor for golf real-time remote positioning, which comprises a monitoring camera body, the surface of the monitoring camera body is sleeved with a shell, the shell can slide back and forth on the surface of the monitoring camera body, the two sides of the shell are fixedly connected with supports, and the supports are fixedly connected with the monitoring camera body. The side, away from the shell, of the support extends to the bottom of the monitoring camera body and is fixedly connected with a sleeve plate, the bottom of the monitoring camera body is movably connected with a transmission rod through a bearing, the surface of the transmission rod is fixedly connected with a rotating wheel, and the bottom of the rotating wheel is fixedly connected with a sliding rod located in the sleeve plate. And the sliding rod is in sliding connection with the sleeve plate. According to the utility model, the housing slides back and forth on the surface of the monitoring camera body, the amount of light entering the camera is directly controlled, the housing moves forward to enlarge the shading area, overexposure or identification interference caused by direct sunlight is avoided, the housing moves backward to reduce the shading range, the amount of light entering is increased, and the imaging quality in a low-light environment is improved.

The present application relates to a kind of polyamide aerogel film with coordination-covalent double crosslinking network structure and its preparation method and application, with carboxyl-containing diamine, carboxyl-free diamine, diacyl chloride and blocking agent as raw material, solution polymerization is carried out in the presence of organic base, and the polyamide oligomer solution containing polymerizable double bond in end group is obtained;The purified and dried polyamide oligomer is dissolved in aqueous solution containing organic base, and metal salt is added to form coordination crosslinking hydrogel film, and double crosslinking network is constructed by initiating end group double bond polymerization by ultraviolet irradiation, and finally freeze-dried to obtain polyamide aerogel film.The polyamide aerogel film of the present application has high porosity, excellent flexibility and mechanical stability, can efficiently and selectively adsorb heavy metal ions in water body, and can be regenerated efficiently and recycled multiple times by mild acid desorption-alkali activation combined regeneration process, aiming at providing a kind of high-performance, low-cost and sustainable solution for water treatment and environmental remediation field.

This invention discloses an environmentally friendly automotive interior material and its preparation method, belonging to the field of automotive interior material preparation technology. This invention addresses the technical problem that the interlayer bonding strength and surface durability of existing automotive interior materials need further improvement. Specifically, it includes the following steps: uniformly coating a self-healing water-based surface layer slurry onto the surface of release paper, subjecting it to a primary heat treatment at 80-90℃ for 1-2 minutes, and then in-situ coating a modified texture-reinforcing layer slurry to obtain an upper composite layer. This invention first prepares a self-healing water-based polyurethane dispersion, mixes it into a texture-reinforcing layer slurry and a surface layer slurry, coats them onto release paper, and heat-treats them to form the upper composite layer. Simultaneously, water-based polyurethane foaming slurry is roller-pressed and permeated into polyester nonwoven fabric to form a lower composite layer. After the two layers are wet-stacked, they are formed by a three-stage gradient hot pressing, and the release paper is peeled off to obtain the final product. This significantly improves the interlayer bonding strength, surface durability, and long-term service stability of the automotive interior material.

This invention relates to the field of pharmaceutical formulation technology, specifically to a sustained-release formulation of rifabutin, and more specifically, to a sustained-release rifabutin formulation composition for treating Helicobacter pylori infection. The key technical point of this invention is that it uses a novel antibiotic for treating Helicobacter pylori infection as the active ingredient, supplemented with specific inactive ingredients, including a hydrophilic gel-type matrix sustained-release material, a swelling agent, a buoyancy aid, and a lubricant. Through the synergistic effect of the hydrophilic gel-type matrix sustained-release material, the swelling agent, and the buoyancy aid, the composition can rapidly swell in gastric juice and maintain a floating state, thereby significantly prolonging the residence time of the formulation in the stomach and upper small intestine. This invention solves the technical problem of conventional formulations having a short residence time in the stomach and requiring frequent administration to maintain an effective antibacterial concentration, achieving the goal of effectively eradicating Helicobacter pylori by reducing the number of doses while maintaining an effective concentration at the site of infection for a longer period.

The utility model relates to chain wheel technical field, and specifically is a kind of replaceable chain nest longevous chain wheel, including sprocket body, the sprocket body is equipped with multiple bosses, the boss is equipped with clamping block, the clamping block is clamped between gear block, the gear block is abutted between one end and boss, fastening bolt is penetrated in the clamping block, the fastening bolt is threadedly connected between adjacent gear block, two chain nests are equipped on the gear block, the gear block is fixedly connected with link key, the boss is equipped with keyway, and the link key is clamped between keyway;In use, gear block can be replaced according to chain nest wear condition, and entire sprocket shaft group or sprocket piece does not need to be replaced, not only can guarantee the mechanical strength and stress condition of chain wheel, but also convenient to replace, can be replaced in pit, single-piece weight is small, substantially improve maintenance efficiency, reduce labor intensity, reduce pit operation safety risk.

A condenser for separating low-molecular polymers in gas comprises a condenser body and a scraper assembly. The condenser body is of a coaxial sleeve structure and sequentially comprises an inner condensation pipe, a first outer pipe and a second outer pipe from inside to outside, an annular gas channel and an outer condensation water channel are formed respectively, and double-layer cooling is formed. The scraper assembly is arranged in the annular gas channel and comprises a rotatable annular support, a spiral scraper and a driving mechanism. Scraping parts matched with the outer wall of the inner condensation pipe and the inner wall of the first outer pipe in shape are arranged on the inner edge and the outer edge of the scraper respectively, polymer condensate on the two side wall faces is scraped in a synchronous rotating mode in the operation process, and scraped objects are conveyed downwards to the bottom through a spiral structure. In addition, a sealing pipe can be additionally arranged in the inner condensation pipe to form an inner condensation channel which is used for being communicated with an external circulating water cooling system, the sealing pipe is used for providing a channel for penetration of the output shaft of the driving mechanism, and the space layout is optimized. Cooling water sequentially flows through the inner condensation channel and the outer condensation water channel to achieve graded dual utilization.

The utility model belongs to the technical field of rings, in particular to a ring connecting structure, which comprises a base and a rabbet, a connecting rod penetrating through the base from outside to inside is arranged at the bottom of the rabbet, a connecting piece fixed with the penetrating part of the connecting rod is arranged on the inner side of the base, and the rabbet and the connecting piece are components made of the same material. The bottoms of the connecting rods are connected with the fixed base through welding with the connecting pieces, and the number of the connecting rods is at least two; the first connecting hole is matched with the connecting rod, an automatic positioning function can be achieved when the first connecting hole and the connecting rod are in butt joint, positioning is not needed during welding, only the first connecting hole and the connecting rod need to be kept in a pressed state, and welding difficulty is reduced; meanwhile, the rabbet and the connecting piece are made of the same material, so that the mechanical strength and chemical compatibility after welding are guaranteed, the overall strength is higher, and the appearance is attractive.

The application discloses a copper-clad plate based on montmorillonite glass fiber and a preparation method thereof, and belongs to the technical field of copper-clad plates. The copper-clad plate is mainly prepared by replacing traditional glass fiber cloth with montmorillonite glass fiber cloth with a surface graphene film, so that the copper-clad plate has high conductivity, high thermal conductivity and mechanical strength, and is suitable for high-frequency communication, high-power electronics and other fields. The preparation process is simple, compatible with the existing production line, and has significant technical advantages and industrial application prospects.

The utility model relates to wire and cable processing technical field, the utility model provides a kind of anti-sticking wire and cable plastic extruder, including bottom plate, first support frame and second support frame are fixedly installed on the bottom plate, hollow rotating column is rotatably installed between the first support frame and second support frame, the left and right ends of the hollow rotating column are rotatably installed with first sealing ring and second sealing ring respectively, the first sealing ring is fixedly connected with first support frame, the second sealing ring is fixedly connected with second support frame, large, inner small cavity is separated by heat insulation stub in hollow rotating column, respectively install third, fourth electric heating rod;Between outer hollow heat conduction column and hollow heat insulation column, heat insulation ring separates corresponding space, installs first, second electric heating rod.This inside and outside corresponding partition heating, form preheating and heating area, avoid plastic sudden high temperature.Moisture is preheated, reduce the adhesion caused by water vapor or softening, reduce cleaning difficulty, prolong equipment life.

The utility model relates to an unmanned plane technical field especially is related to a quick -mounting type unmanned plane landing gear charging communication adaptation device, solved unmanned plane landing gear recovery kit installation complex or need to carry out the irreversible structural modification to landing gear, reduce the technical problem of structural stability, it includes T type unmanned plane landing gear assembly, charging communication module, landing gear transverse stiffener group and landing gear wheel body assembly. Through the modularization quick -mounting design, the device need not to carry out destructive processing to unmanned plane original landing gear, can realize the efficient integration of charging and communication function. The present application can significantly improve the installation convenience, keep landing gear original mechanical strength, satisfy the demand of quick deployment and nimble replacement in unmanned plane automatic operation, ensure accurate positioning and stable charging communication simultaneously, provide reliable technical support for unmanned plane hangar and other automatic equipment.

The utility model discloses a dynamic balancing device, which relates to the technical field of generators and comprises a first extension shaft used for connecting a high-speed testing machine; the first extension shaft and the second extension shaft are used for being correspondingly connected with the two ends of the exciter rotor respectively; the transition disc is provided with at least two spigots along the axial direction of the transition disc, one spigots is connected with the first extension shaft or the second extension shaft, and the other spigots are used for being connected with the corresponding end of the exciter rotor; and the at least three groups of fasteners are used for connecting the exciter rotor between the first extension shaft and the second extension shaft through the transition disc. According to the dynamic balance device, the actual high-speed operation condition of the exciter rotor can be simulated, the correction accuracy is improved, and the service life of the exciter rotor is prolonged.

This invention relates to the field of cable material technology, and in particular to an antimicrobial adhesion underwater cable sheath material and its preparation and modification process. It comprises the following components in parts by weight: 60-65 parts LLDPE; 10-15 parts PP; 8-12 parts PVDF; 8-12 parts EVA; 0.3-0.5 parts mixed antioxidant; and 0.1-0.3 parts mixed lubricant. This invention utilizes a quaternary blend system of LLDPE, PP, low molecular weight PVDF, and EVA, combined with a highly efficient antioxidant and lubricant, to give the sheath material excellent water resistance, aging resistance, and antimicrobial adhesion properties. After activation by 360° annular plasma under constant pressure, a hydrophilic hydration layer of HEMA and NVP is grafted onto the sheath surface, which effectively inhibits microbial adhesion and biofilm formation, significantly extending the service life of underwater cables.

The application discloses a negative-electrode-free sodium battery diaphragm, a preparation method and application thereof, and relates to the technical field of negative-electrode-free sodium batteries. The application forms a sandwich structure by using a positive electrode side polymer layer, a heat conduction layer and a negative electrode side polymer layer, introduces polyolefin elastomer POE into the negative electrode side polymer layer, enhances the elasticity of the diaphragm, buffers the expansion and contraction of the negative electrode side in the charging and discharging process, guarantees the close adhesion of the interface, the heat conduction layer quickly conducts heat, reduces the interface side reaction caused by the heat accumulation, avoids the loss of elasticity of the elastic layer due to high temperature aging, and the positive electrode side polymer support layer guarantees the overall mechanical strength, avoids the deformation of the diaphragm in the cycle process, and prevents the short circuit condition. The sandwich structure can effectively solve the core problems of the interface buffer adhesion and the low heat dissipation efficiency of the negative-electrode-free battery, provide sufficient mechanical strength to prevent the deformation of the diaphragm and the short circuit of the battery, and can simultaneously improve the expansion buffer effect, the heat dissipation capacity, the electrochemical performance and the gas production inhibition effect.

This application relates to the field of molding dies for irregularly shaped mica parts, and in particular to an integrated molding die for burr-free molding. An integrated molding die for burr-free molding includes a female mold and a male mold, which are joined together by a sealing element to form an irregularly shaped mold cavity. The male mold has several injection ports that communicate with the irregularly shaped mold cavity. The male mold is fixedly and sealed with several injection pipes that communicate with the injection ports. The male mold has several liquid level regulating ports that communicate with the edge of the irregularly shaped mold cavity. The male mold is fixedly and sealed with several liquid level regulating pipes that communicate with the liquid level regulating ports. Irregularly shaped mica parts prepared using the above-mentioned integrated molding die for burr-free molding have a low burr rate, eliminating the need for secondary trimming, improving production efficiency, reducing trimming waste, lowering production costs, and enhancing the core competitiveness of irregularly shaped mica parts.

This invention provides a coreless stator with a high magnetic flux density and a thin working area, and an axial flux motor. The coreless stator includes a first winding unit and a second winding unit stacked axially. Several winding coils of the first and second winding units are fabricated on a conductive substrate using a subtractive process. Each winding coil includes a working area, a hollow slot, and bent outer and inner coil bridging areas. The first and second winding units are circumferentially misaligned during axial stacking, so that the working areas of the first and second winding units are circumferentially spaced and distributed in the same radial plane, forming the stator working section. The thickness of the stator working section does not exceed half the total thickness of the coreless stator. This application further thins the stator working section of the coreless stator, significantly reducing the effective working air gap length of the axial flux motor, significantly enhancing the air gap magnetic flux density, improving the motor's torque density and power density, and achieving synergistic optimization of performance and reliability.

The invention relates to the technical field of separation, and relates to chelate resin for removing calcium and magnesium ions in water as well as a preparation method and application of the chelate resin. The chelate resin for removing calcium and magnesium ions in water provided by the invention is composed of the matrix resin and the modified group, and the introduction of the modified group improves the adsorption capacity and stability of the matrix resin to the calcium and magnesium ions, and can respectively reduce the concentrations of calcium ions and magnesium ions in high-salt sewage to 0.5 ppm or below. And the capacity is still kept at 85% or above after 15 times of recycling, so that the sewage treatment cost is greatly reduced, and the method has a wide application prospect.

The utility model belongs to the technical field of power capacitor manufacturing, and particularly relates to a composite capacitor core shaft and a capacitor element. The composite capacitor core shaft comprises a core shaft body provided with a regular hexagon through hole, the core shaft body is composed of insulators, annular long holes are formed in the wall thickness of the two ends of the core shaft body in the length direction of the core shaft body, and an insulator interval is arranged between the two ends, close to each other, of the two annular long holes to form isolation. Heat conduction metal bodies are inserted into the two annular long holes respectively, the heat conduction metal bodies and the mandrel body are integrally formed, and the ends, away from each other, of the two heat conduction metal bodies make contact with metal spraying layers at the two ends of a metallized film on the capacitor element so that heat transfer of the capacitor element can be achieved. The internal hot spot temperature of the capacitor element is effectively reduced, the transverse heat conduction efficiency of the capacitor element is improved, the heat transfer effect is further improved, and the problem that heat dissipation and heat balance in the capacitor element with the enlarged geometric size become poor is solved.

The application belongs to the field of marine corrosion protection and intelligent coating, and relates to an intelligent epoxy resin anticorrosive coating based on a dual-mode early warning and a preparation method. The coating is prepared by modifying epoxy resin (E44) and polypropylene glycol diglycidyl ether (PPGDGE) with 1,10-phenanthroline-5-amino (APhen), and then curing and cross-linking the two epoxy resin prepolymers with polyetheramine (D400) to obtain an epoxy resin anticorrosive coating with a pre-warning function. 2+ Due to the introduction of APhen, the prepared epoxy resin anticorrosive coating has fluorescence performance, can be complexed with Fe 2+ , and obvious visual coloration occurs. With the increase of the concentration of Fe , fluorescence quenching occurs. These two characteristics endow the system with a pre-warning function for local corrosion of a metal substrate. Meanwhile, the intelligent epoxy resin coating prepared based on the interpenetrating network has excellent mechanical properties and wide market prospects. The steps are simple, the operation is convenient, and the practicality is strong.

The utility model relates to the technical field of hooks, and discloses a hole plate hook which comprises an installation plate and a hook body, a cavity is formed in the back face of the installation plate, and a through matching hole is formed in the front face of the installation plate and used for installing the hook body. According to the hole plate hook, the arc-shaped limiting section and the vertical limiting section are inserted into the adjacent matching holes of the mounting plate respectively to form double-point limiting, so that bidirectional constraint in the horizontal direction is formed, rotation and horizontal displacement of the hook body are effectively restrained, and the shaking problem of a traditional single-point supporting hook is thoroughly solved; the first horizontal limiting section and the second horizontal limiting section form staggered buckles on the back side of the mounting plate, and the vertical section is tightly attached to the front face of the mounting plate, so that double locking in the front-back direction is achieved, the hook is prevented from being disengaged due to external force impact or heavy object swing, and the overall stability is improved; and secondly, the arc-shaped limiting sections and the vertical limiting sections are inserted into the adjacent matching holes correspondingly, so that double-point supporting can be achieved, the bearing load is effectively dispersed, the bearing capacity is improved, and the mechanical strength is guaranteed.

The invention relates to a turbine assembly having a longitudinal axis X, in particular for an aircraft, comprising a plurality of variable pitch stator vanes arranged about the longitudinal axis. According to the invention, the assembly comprises a plurality of rolling bearing shells, which are separate and each configured to receive a root of a stator bucket such that said root can pivot about a pitch change axis, and an annular support member (35) centered about a longitudinal axis, the support member is equipped with a plurality of sleeves (36) extending radially and provided with inner pockets (25), each inner pocket being configured to removably receive one of the rolling bearing shells (26), the sleeves (36) being connected together in the circumferential direction by separate first and second attachment elements (50, 51).

The invention discloses a numerical control needling machine for preforms, and relates to the technical field of needling machines. A prefabricated body numerical control needling machine comprises needling equipment, a rail is installed on the needling equipment, a sliding table is installed on the rail, a lifting plate is connected to the sliding table through a lifting mechanism, needles are installed on the lifting plate, and the prefabricated body numerical control needling machine further comprises a plurality of installation holes which are all formed in the lifting plate, a plurality of mounting holes are formed in the lifting plate, a rotating ring is rotationally mounted in each mounting hole, an insertion hole is formed in each rotating ring, the pricking needles are inserted into the insertion holes, a driving part is arranged on the lifting plate, and when the lifting plate ascends to a limit position, the driving part drives the rotating rings to rotate; according to the invention, the felting needle can rotate intermittently, so that the felting needle is not easy to bend or break in one direction, and the barbs on the felting needle can be changed in radial position, so that fibers in different directions can be ejected into the prefabricated body, the fibers in the prefabricated body are more complex, and the mechanical strength of the prefabricated body is guaranteed.

The utility model relates to a split-type moving contact structure and a dual-power change-over switch, and the structure comprises a moving contact rod which comprises an upper moving contact rod and a lower moving contact rod. The upper moving contact rod comprises an upper arc plate, an upper connecting plate and an upper assembling plate, and the upper arc plate is arranged in an upward arched manner; the lower moving contact rod comprises a lower arc plate, a lower connecting plate and a lower assembling plate, and the lower arc plate is arranged in a downward concave manner; the upper arc plate and the lower arc plate are oppositely arranged and spliced to form a circular ring; upper moving contacts are welded to the upper ends of the upper assembling plates on the two sides, and lower moving contacts are welded to the lower ends of the lower assembling plates on the two sides. In the scheme, a moving contact rod comprises an upper moving contact rod and a lower moving contact rod which are attached and fixed, the middle part of the upper moving contact rod is configured to be an upper arc plate which is arched upwards, the middle part of the lower moving contact rod is configured to be a lower arc plate which is sunken downwards, the overall sectional area of the moving contact rod is increased, and the upper moving contact rod and the lower moving contact rod realize current shunting. The current-carrying pressure of the single-acting contact rod is reduced, and the current-carrying capability is improved.