855results about How to "Ensure structural stability" patented technology

The invention provides a precipitation method of a heavy metal solution. Cations in the heavy metal solution comprise nickel ions, cobalt ions, copper ions, zinc ions and manganese ions, and the precipitation method comprises the following steps: step S100, carrying out a manganese conversion reaction on an alkaline substance by adopting a solution containing manganese ions to obtain a converted manganese precipitate; s200, a stabilizing agent is adopted for carrying out a stabilizing reaction on the converted manganese precipitate, and a stable manganese precipitate is obtained; step S300, adding the stable manganese precipitate into a heavy metal solution for precipitation reaction to obtain precipitate slurry; step S400, continuously carrying out solid-liquid separation on the precipitate slurry to obtain a heavy metal precipitate and a manganese-containing solution; and S500, raw materials including the manganese-containing solution, an oxidizing agent and alkali liquor are subjected to an oxidation precipitation reaction, and a post-precipitation solution and a manganese product are obtained. The method solves the problems of poor sedimentation and filtration performance of a precipitation product, high moisture content of the precipitation product and low precipitation efficiency when heavy metals are precipitated in the heavy metal solution.

According to the tower foot welding and positioning device of the power transmission and transformation iron tower, a supporting steel plate and a reinforcing steel plate are both placed at the upper end of a machining table, two fixing assemblies are symmetrically arranged on the machining table, each fixing assembly comprises two bases arranged in a bilateral symmetry mode and a first sliding groove, and the supporting steel plate is placed between the two bases; a first sliding block in sliding fit with the first sliding groove is arranged at the lower end of the base, the supporting plate can drive the clamping plate to slide by pushing the supporting plate, and therefore the clamping plate can drive the reinforcing steel plate to move on the two sides of the supporting plate, the bottom end of the limiting rod can make contact with the machining table, and through friction force between the limiting rod and the machining table, the reinforcing steel plate can be clamped. And the bottom plate can be limited, so that the positions of the supporting plate and the clamping plate can be fixed, the position of the reinforcing steel plate can be finely adjusted conveniently, and the welding precision of the tower foot can be guaranteed.

The utility model discloses a multi-head rotating device, an electric cleaning brush and an electric tool, and belongs to the technical field of electric tools, the multi-head rotating device comprises a power mechanism, a transmission mechanism and a working mechanism, the transmission mechanism comprises an inner shaft and an outer shaft, the working mechanism comprises an inner disc body and a transmission wheel, and the inner disc body is provided with a rotating head. The inner disc body rotating along with the inner shaft drives the rotating head to revolve around the central axis of the inner disc body, and the transmission wheel rotating along with the outer shaft drives the rotating head rotating around the central axis of the rotating head at the same time. The electric cleaning brush comprises the multi-head rotating device. The electric tool comprises the multi-head rotating device. Due to the fact that all the rotating heads are arranged on the inner disc body, the inner disc body and all the rotating heads can serve as an installation module, when the transmission wheel drives all the rotating heads to rotate through gear matching, transmission matching of all the rotating heads and the transmission wheel can be achieved while the inner disc body is connected to the inner shaft, all the rotating heads do not need to be installed one by one, and the assembling efficiency can be improved.

The invention discloses an offshore concentrated photovoltaic detection early warning operation platform, and relates to the field of offshore photovoltaic power generation. Comprising a pile foundation and a supporting frame supported by the pile foundation, a photovoltaic panel is laid above the supporting frame, an anti-deformation support structure is arranged below the supporting frame, a supporting adjusting pile is arranged at the top end of the pile foundation, and the supporting adjusting pile is used for being supported at the bottom of the anti-deformation support structure. When the pile foundation settles and the supporting frame and the anti-deformation support structure deform, so that the supporting stress of the position of the supporting adjusting pile is changed, the supporting height is adjusted through the supporting adjusting pile to recover the supporting stress to the anti-deformation support structure; the supporting adjusting pile comprises a supporting part and an adjusting part, and the adjusting part adjusts the supporting height relative to the axial direction of the supporting part so as to recover the supporting stress on the anti-deformation support structure.

The invention belongs to the technical field of batteries, and particularly relates to a single battery, a battery and a power utilization device, the single battery comprises: a shell having an accommodating cavity; the top cover is used for buckling the opening of the shell; the battery cell is accommodated in the accommodating cavity, and a tab is arranged at one end, facing the top cover, of the battery cell; the current collecting plate is accommodated in the accommodating cavity and is positioned between a tab of the battery cell and the top cover, and the current collecting plate is provided with a first area and a second area arranged around the first area; wherein the second area protrudes towards the opening relative to the first area, so that a boss is formed on the side, facing the opening, of the flow collecting disc, the boss is located between the shell and the top cover, the boss and the shell are welded to form a first welding part, and the first welding part is located on the side, facing the opening, of the flow collecting disc. The boss and the top cover are welded to form a second welding part, and the first area is electrically connected with the tab; the welding stress is effectively dispersed, and the welding difficulty is reduced.

The invention provides an unfavorable geological section treatment structure of an underground high-pressure gas storage and a design method of the unfavorable geological section treatment structure. The treatment structure comprises replacement concrete arranged between a weak structural layer and backfill concrete. The section of the replacement concrete in the radial direction of the gas storage is an isosceles trapezoid, the upper bottom edge of the isosceles trapezoid is connected with the weak structure layer, the lower bottom edge of the isosceles trapezoid is connected with the backfill concrete, the two waist edges of the isosceles trapezoid are connected with the surrounding rocks on the two sides of the replacement concrete respectively, and the length L3 of the upper bottom edge is smaller than the length L1 of the lower bottom edge. The treatment structure can prevent the safety problem of the gas storage caused by the characteristics of low strength, easy deformation and the like of the weak structural layer.

The invention relates to the technical field of solar power generation, in particular to a photovoltaic and photo-thermal coupling system and a preparation method and application thereof.The photovoltaic and photo-thermal coupling system comprises a semitransparent photovoltaic cell, a photo-thermal reflector, a photo-thermal heat collection unit and a coupling support; the semitransparent photovoltaic cell is fixedly arranged above the photo-thermal reflecting mirror through the coupling support, and the photo-thermal heat collection unit is arranged above the semitransparent photovoltaic cell and is connected with the photo-thermal reflecting mirror through the coupling support. According to the photovoltaic and photo-thermal coupling system, the advantages of photovoltaic power generation and photo-thermal conversion are combined, the utilization efficiency of solar energy is remarkably improved, and multifunctional integration is achieved.

The invention discloses low-carbon flow-state solidified soil for a seasonal frozen region. The low-carbon flow-state solidified soil comprises soil, a curing agent and water, the dosage of the curing agent is 15-20% of the mass of the dry soil; the water content is 40-60% of the dry mass of the soil and the curing agent; the soil comprises sludge and building residue soil, and the sludge accounts for 20-40 parts by weight, and the building residue soil accounts for 60-80 parts by weight; the curing agent is prepared from the following components in parts by weight: 40 to 60 parts of phosphogypsum, 10 to 15 parts of mixing plant waste slurry, 20 to 40 parts of steel slag, 5 to 10 parts of quick lime, 0.5 to 1.2 parts of glycerol, 0.2 to 0.6 part of hydroxypropyl methyl cellulose and 1 to 1.5 parts of water reducing agent; according to the invention, various technical problems of insufficient anti-freezing performance, unstable fluidity, long setting time, insufficient early strength, large shrinkage deformation, easy generation of segregation and bleeding and the like of the existing fluid-state solidified soil are solved, and meanwhile, more low-carbon environment-friendly raw materials are introduced, so that multi-aspect improvement of the performance of the fluid-state solidified soil and maximization of environment-friendly benefits are realized; and a more reliable and efficient solution is provided for earthwork such as foundation pit backfilling.

The utility model relates to the technical field of construction engineering construction, in particular to a novel plate type ballast bed structure in mortise and tenon connection, which comprises a modularized left side plate, a middle plate and a right side plate, and the middle plate is connected with the left side plate and the right side plate in a mortise and tenon mode. The number of the shear hinges is matched with that of the mortise and tenon joints, and the two ends of the shear hinges are connected with the outer sides of the mortise and tenon joints respectively. The assembly type plate-type ballastless track structure has the advantages that the assembly type plate-type ballastless track structure is easy to disassemble and assemble, easy to maintain and repair and convenient to maintain and replace, and the service life of the assembly type plate-type ballastless track structure is prolonged; during replacement and maintenance, the operation process is rapid and simple, skylight time is effectively utilized for construction, and driving in the next day is not affected; stable connection is formed by adopting a tenon-mortise structure, so that the prefabricated track plate structure is firmer and more reliable, and the stability of the track structure is ensured; the original structure is not affected after maintenance and replacement, and safety and reliability are achieved.

The utility model discloses a pair of elastic opening and closing shoes easy to put on and take off. The shoe body comprises a sole, a vamp and an elastic piece; the vamp comprises a half sole part, a heel part and a connecting part which are all connected to the sole, the connecting part is close to the sole and is connected with the lower end parts of the half sole part and the heel part, and the upper end parts of the half sole part and the heel part are separated from each other; the heel part is suitable for being switched between a first state and a second state under the action of external force, when the heel part is in the first state, the heel part is close to the half sole part and matched with the half sole part to form a shoe opening, and when the heel part is in the second state, the heel part is far away from the half sole part and enables the shoe opening to be opened; the elastic piece is connected with the half sole part, the heel part and the connecting part and is suitable for being unfolded under the action of external force, so that the heel part enters the second state; and when the external force is lost, the elastic piece rebounds and resets, so that the heel part returns to the first state. The utility model provides an elastic opening and closing shoe easy to put on and take off, which is easy to open, has excellent recovery performance and ensures the convenience of the shoe in the putting on and taking off process.

The invention discloses a PP resin foaming optical diffusion plate and a preparation method thereof.The diffusion plate comprises an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are located on the two sides of the middle layer, the thickness ratio of the upper layer to the middle layer to the lower layer is 1: (7-9): 1, and the upper layer and the lower layer are the same in composition; the upper layer is prepared from the following components in parts by mass: PP resin, PP-g-MAH resin, copolymer microspheres, a flame retardant, an antioxidant, mineral oil, a light stabilizer, an ultraviolet light absorber and a whitening agent; the middle layer is prepared from the following components in parts by mass: GPPS resin, a foaming agent, an antioxidant, mineral oil, a light stabilizer, an ultraviolet light absorber and a whitening agent, and the diffusion plate is stable in overall structure, good in optical performance and low in manufacturing cost.

The invention discloses a conductive glass fiber cloth, which comprises a glass fiber base cloth and a carbonized conductive layer formed on the glass fiber base cloth, and the carbonized conductive layer is obtained by coating conductive ink and calcining, the conductive ink is prepared from the following components in parts by weight: 10 to 30 parts of low-melting-point glass powder, 3 to 5 parts of graphene, 0.5 to 2 parts of single-walled carbon nanotubes, 0.1 to 0.5 part of conductive carbon black, 5 to 10 parts of resin, 0.1 to 0.3 part of dispersing agent, 0.01 to 0.03 part of anti-settling thixotropic agent, 0.01 to 0.05 part of silane coupling agent, 70 to 90 parts of water and 5 to 20 parts of ethanol. The conductive glass fiber cloth is high in sheet resistance stability, good in coating adhesion fastness, excellent in impact resistance and suitable for conductive functionalization of thin glass fiber cloth.

The invention discloses a full-size wind tunnel high-load blade, which relates to the technical field of wind tunnel equipment and comprises a metal blade root, a hollow main beam and a blade body, a main beam connecting section is arranged at one end of the metal blade root, and the side wall of the main beam connecting section is a first conical side wall surface; the large opening end of the first conical side wall face is closer to the end, provided with the main beam connecting section, of the metal blade root than the small opening end of the first conical side wall face. The hollow main beam is formed by wrapping a carbon fiber cloth layer; a blade root connecting section is arranged at one end of the hollow main beam and fixedly arranged on the main beam connecting section in a sleeving mode. The inner side wall of the blade root connecting section is a second conical side wall face, and the second conical side wall face is attached to the first conical side wall face. The blade body is made of a carbon fiber material; and the blade body is fixedly arranged on the hollow main beam. The lightweight design degree of the blade is improved, and the lightweight effect of the blade structure is achieved.

The invention relates to the technical field of deep foundation pit auxiliary supporting, and discloses a large staggered-span continuous-row double-high-span steel structure deep foundation pit auxiliary supporting device which comprises a supporting base, inclined reinforcing ribs are fixedly installed on one side of the upper end of the supporting base, and a plurality of soil inserting nails are symmetrically and fixedly connected to the lower end of the supporting base. The supporting base is further provided with an emergency reinforcing protection mechanism. The supporting performance with higher strength can be provided, and the high-quality deep foundation pit auxiliary supporting work is achieved.

The invention belongs to the technical field of steelmaking equipment, and discloses a novel steel wire rope self-lubricating device, a using method and application. The centering device can be coaxially and detachably connected with a water outlet of a continuous casting tundish and a water inlet of a crystallizer, and the device can be detachably connected with a steel wire rope. The device can be detachably connected with the steel wire rope, is convenient to mount and dismount, and is suitable for different working environments and steel wire rope specifications. Due to the detachable connection design of the supporting frame and the mandrel and the coaxial connection of the steel wire rope frame and the mandrel, the structural stability and reliability of the device are guaranteed. According to the method, the flow speed of the oil dripping needle tube and the falling position of oil drops can be controlled by adjusting the oil pressure and the maximum diameter between the oil leakage nozzle and the steel wire rope, and waste and pollution are avoided while the lubricating effect is ensured.

The invention discloses a photovoltaic power station capable of avoiding an undermining phenomenon in a desert region, which comprises a plurality of first upright posts, a plurality of second upright posts, photovoltaic panels, a first partition plate and a second partition plate, and is characterized in that the first upright posts are higher than the second upright posts, and the photovoltaic panels are obliquely arranged on the first upright posts and the second upright posts; the first partition plate is connected with at least one of the first stand column and the second stand column and horizontally arranged, one end of the first partition plate is connected with the bottom end of the photovoltaic panel, and the second partition plate is connected with at least one of the first stand column and the second stand column and located below the first partition plate. The second partition plate is parallel to the first partition plate, and the second partition plate is used for downwards abutting against the sand ground of the desert region. The photovoltaic power station provided by the embodiment of the invention can avoid the undercutting phenomenon in a desert region, greatly improves the structural stability of the stand column, and has the advantage of high use safety.

The invention provides a heat sink device, a laser and a device. The heat sink device comprises a substrate, a first metal film layer and a second metal film layer, wherein the substrate comprises a first surface and a second surface which are oppositely arranged, the first surface is provided with a first metal film layer, and the second surface is provided with a second metal film layer; the thermal expansion coefficients of the first metal film layer and the second metal film layer are greater than the thermal expansion coefficient of the substrate; the average metal grain size in the first metal film layer and the second metal film layer is D [mu] m, and 0.5 < = D < = 20; the substrate, the first metal film layer and the second metal film layer meet the following relational expression: 0.5 < = D * (1 + (Vmax / Vmin)-(S2 / S1)) < = 45; vmax is the size which is not smaller in the two metal film layers; vmin is the volume which is not large; s2 is the area of the surface, connected with the substrate, of the first metal film layer; s1 is the area of the first surface of the substrate; s2 is not greater than S1. The heat sink device provided by the invention has the advantages of good stability and small deformation, and the laser has the effect of stable performance.

The invention relates to the field of batteries, and provides a battery clamp and a preparation method thereof. The battery clamp comprises a first clamping plate, and a first clamping groove is formed in the first clamping plate; a second clamping groove is formed in the second clamping plate, and under the condition that the first clamping plate is installed on the second clamping plate, the first clamping groove and the second clamping groove form a clamping space used for clamping the outer circle face of the battery; the telescopic supporting rod is connected to the first clamping plate or the second clamping plate. The battery clamp can effectively clamp the outer circular surface of the battery and prevent the battery from moving or sliding off in the operation process, so that the stability and the safety of operation are ensured. And the design of the clamping groove fully considers the protection of the battery, so that the damage to the battery caused by too large clamping force of a traditional clamp is avoided, the service life of the battery is prolonged, and the maintenance cost is reduced.

The invention discloses a cesium-lead-bromine / silicon dioxide quantum dot and a preparation method thereof, and belongs to the technical field of quantum dot luminescent materials.The preparation method comprises the steps that at the temperature of 75-95 DEG C, cesium bromide, lead bromide and water are mixed and then magnetically stirred, and a cesium-lead-bromine precursor solution is obtained; at the temperature of 75-95 DEG C, mixing aminopropyltriethoxysilane with the cesium-lead-bromine precursor solution, and then carrying out magnetic stirring to obtain a cesium-lead-bromine / silicon dioxide solution; and drying the cesium lead bromide / silicon dioxide solution at the temperature of 75-95 DEG C to obtain the cesium lead bromide / silicon dioxide quantum dots. The cesium-lead-bromine / silicon dioxide quantum dot has the characteristics of structural stability, acid resistance, 800 DEG C high temperature resistance, water resistance and the like, is long in luminescence life, high in quantum yield and non-toxic, and meets the preparation requirements of flexible wearable devices, light-emitting gratings and other optical devices.

The invention relates to the technical field of bus duct assembly, in particular to a tool platform and method for improving the assembly accuracy of an elbow bus duct. Comprising a base frame; the adjusting module is fixedly arranged on the base frame in a horizontal state, and the adjusting module is provided with a first adjusting plate and a second adjusting plate which can be obliquely adjusted; the two sets of back shore modules are symmetrically arranged and are vertically arranged on the first adjusting plate and the second adjusting plate correspondingly; the number of the correcting and limiting modules is two, and the two correcting and limiting modules are oppositely arranged on the base frame in a vertical state and located on one side of the adjusting module; the two groups of correction limiting modules are used for limiting and supporting the bending angle of the elbow bus duct; according to the invention, automatic correction and accurate positioning of assembling parts of the elbow bus duct can be realized, and the limiting and supporting state can be automatically adjusted according to elbow bus ducts in different shapes.

The present invention provides a tool for automobile parts inspection, which belongs to the field of automobile parts inspection, and comprises a fixing platform, wherein the upper end of the fixing platform is provided with a tail pipe fixing assembly, a main muffler fixing assembly and an exhaust pipe fixing assembly in sequence from left to right. The present invention adopts the tail pipe fixing assembly, the main muffler fixing assembly and the exhaust pipe fixing assembly to stably clamp and seal the tail pipe end, the main muffler and the exhaust pipe end of the automobile muffler, respectively, which not only increases the clamping and fixing fulcrum of the automobile muffler, improves the clamping efficiency and clamping stability of the automobile muffler, but also can adjust the automobile muffler as a whole to a centered state during the clamping process, avoids the automobile muffler from being subjected to an unbalanced clamping force and affecting its stability during the air tightness detection process, ensures that the automobile muffler is tested for air tightness in a stable state, and thus improves the accuracy of the air tightness detection of the automobile muffler.

The invention relates to the technical field of electrode materials, in particular to a composite silicon negative electrode material suitable for a sulfide-based all-solid-state battery and a preparation method and application thereof, and the preparation method comprises the following steps: (1) generating a metal organic framework material on the surface of a nano silicon material through an in-situ growth method; (2) carbonizing the metal organic framework material on the surface of the nano silicon material through calcination treatment to form a nitrogen-doped porous carbon material, so as to obtain a Si-NC material; and (3) generating a sulfide solid electrolyte on the surface of the Si-NC material through an in-situ growth method to obtain the Si-NC-SE composite silicon negative electrode material. According to the invention, the surface of the Si material is coated with the nitrogen-doped porous carbon material (NC) through an in-situ generation technology, and the sulfide solid electrolyte is generated in situ, so that the conductivity of the composite silicon negative electrode material and the cycling stability of the sulfide-based all-solid-state battery adopting the composite silicon negative electrode material are improved.

The invention discloses a method for assembling a fabricated station component, which comprises the following steps: after a foundation pit is excavated, constructing a cast-in-place bottom plate 1, and after the construction of the cast-in-place bottom plate 1 is completed, assembling a prefabricated component, the construction of the cast-in-place bottom plate at least completes the construction of the first eight rings, and the method specifically comprises the following steps: step 1, completing the production of the prefabricated component in a factory; transporting to a construction site; secondly, a fine flat strip is constructed at the bottom of the excavated foundation pit and serves as an assembling base face of a bottom plate 1 component; thirdly, a plurality of trolleys and cranes are arranged, the middle stand columns 5 are hoisted through the cranes, the bottoms of the middle stand columns 5 are temporarily fixed through bolts, and then the postures of the middle stand columns 5 are adjusted through the trolleys till positioning is completed; fourthly, a middle longitudinal beam 6 is hoisted, and the middle longitudinal beam 6 is fixedly connected with the top of the middle stand column 5; after the two prefabricated parts designed in the scheme are spliced, the next prefabricated part can be spliced without a certain cooling and stabilizing time, so that the assembling efficiency is greatly improved.

The invention belongs to the technical field of sensors, and particularly relates to an MEMS differential pressure sensor and a preparation method thereof. The MEMS differential pressure sensor comprises a substrate, a vibrating diaphragm part, a back pole part and a supporting part, a back hole structure is arranged in the substrate, the vibrating diaphragm part is arranged on one side of the substrate and seals the back hole structure, the back pole part is arranged on one side, away from the substrate, of the vibrating diaphragm part and is connected with the vibrating diaphragm part, the vibrating diaphragm part is connected with the substrate through the supporting part, and an air leakage channel is arranged in the supporting part. The air leakage channel is communicated with the back hole structure and the outside of the base. According to the MEMS differential pressure sensor provided by the embodiment of the invention, the air leakage channel is arranged in the supporting part instead of forming an air leakage hole in the vibrating diaphragm, so that external pollutants are prevented from directly entering the gap area through the air leakage hole, and the MEMS differential pressure sensor is prevented from losing efficacy due to the external pollutants in the gap area. Meanwhile, the air leakage channel is communicated with the back hole structure and the outside of the base, so that good air leakage performance can be maintained.

The invention discloses silver-coated calcium carbonate multi-layer core-shell structure composite powder and a preparation method thereof.The preparation method comprises the steps that firstly, the surface of inner core calcium carbonate is coated with a layer of SiO2 through a sol-gel method, a CaCO3 at-SiO2 core-shell structure is formed, then Ag is loaded on CaCO3 at-SiO2 through a reduction method, and the core-shell structure composite powder with CaCO3 at-SiO2 at-Ag double-layer shell layers is formed. According to the method, silicon dioxide is ingeniously used as a middle layer, calcium carbonate and silver can be well combined together in the presence of silicon dioxide, and the problem that calcium carbonate cannot be coated with silver is solved. The method provided by the invention provides a new method for preparing a calcium carbonate core-shell structure, and also provides a new research thought for inorganic coating.

The invention provides a ternary high-nickel positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. The preparation method of the ternary high-nickel positive electrode material comprises the following steps: mixing a positive electrode material precursor, a lithium source and a zirconium-containing additive, and carrying out primary sintering to obtain a primary sintered product; mixing the product obtained after primary sintering with a titanium-containing additive, and carrying out secondary sintering to obtain a product obtained after secondary sintering; mixing a product obtained after secondary sintering with water and aluminum nitrate, and carrying out wet washing coating, filtering and drying to obtain a coated material; and mixing the coated material with an additive containing doping elements, and sintering for three times to obtain the ternary high-nickel positive electrode material. A uniform needle-shaped coating layer can be formed on the surface of a product after secondary sintering, direct contact between an electrolyte and the material can be prevented, side reactions are reduced, migration of lithium ions to the surface can be avoided, the structural stability of the material is kept, and the capacity exertion is facilitated.

The utility model discloses a coconut fiber hard mat with edge reinforcing structure, relates to the technical field of coconut fiber hard mattresses, and comprises a coconut fiber layer and a mattress body, non-woven fabrics are attached to both ends of the coconut fiber layer, and a springback sponge is attached to one end of the non-woven fabrics far away from the coconut fiber layer. The mattress body wraps the outer sides of the coconut fiber layer, the non-woven fabric and the rebound sponge, a filling layer is mounted on the outer side of the mattress body, and a steel wire belt is arranged in the filling layer. When the coconut fiber hard cushion with the edge reinforcing structure is used, the edge position of the mattress can be supported and reinforced through the filling layer and the reinforcing layer on the periphery of the mattress body, and the steel wire belts are mounted in the filling layer in a crossed and uniform arrangement manner, so that the compression resistance effect of the edge of the mattress can be improved through the steel wire belts; therefore, the edge position of the mattress body is not easy to collapse and loosen, and the service life of the mattress body is prolonged.

The invention relates to the technical field of stator core production, in particular to a motor stator core automatic processing and forming method, which comprises a first punching mechanism, a second punching mechanism, a first feeding mechanism, a second feeding mechanism, a lamination conveying mechanism, an assembling jig, a welding mechanism and a discharging mechanism, the first punching mechanism is used for punching a first stator iron sheet, the second punching mechanism is used for punching a second stator iron sheet, the first feeding mechanism is used for grabbing a first stator iron sheet punched by the first punching mechanism and placing the first stator iron sheet on the assembling jig to be assembled into a first stator iron ring, and the second feeding mechanism is used for grabbing the second stator iron sheet punched by the second punching mechanism and placing the second stator iron sheet on the assembling jig to be assembled into a second stator iron ring. And stacking the first stator iron rings placed on the assembling jig to form a second stator iron ring. By means of a series of automatic and precise processing steps, efficient, precise and stable production of the stator iron core is achieved. According to the method, the production efficiency is improved, the production cost is reduced, and the quality and reliability of products are remarkably improved.

The invention discloses a preparation method of an ultra-smooth nanocrystalline tungsten coating on the surface of an emitter, the tungsten coating is prepared by adopting a magnetron sputtering method, and the specific process is as follows: pretreating an emitter workpiece, then placing the emitter workpiece in a vacuum chamber, pre-vacuumizing, then introducing inert gas, cleaning the surface of the emitter workpiece by utilizing gas ion reverse sputtering, and finally removing the surface of the emitter workpiece. And then adjusting the gas pressure, bombarding and cleaning the surface of the emitter workpiece by using metal ions, and finally sputtering and depositing to form the tungsten coating. The tungsten coating is prepared through the magnetron sputtering technology, the tungsten coating has the characteristics of being compact in structure, good in combination and uniform and smooth in surface, the mechanical property and structural stability of the tungsten coating in the high-temperature service environment can be guaranteed, the deposition technology is simple, the preparation efficiency is high, and the tungsten coating is green and free of pollution, in addition, preparation of the tungsten coating composed of different phases can be achieved, and the application prospect is wide. The application requirements in the fields of electronic industry, nuclear industry and the like are met.

The invention relates to the technical field of battery packs, and discloses a bottom protection structure for a battery pack and the battery pack, the bottom protection structure for the battery pack comprises a liquid cooling plate, a bottom protection plate and a buffer layer; the bottom of the liquid cooling plate comprises a non-flow channel area and a protruding flow channel area; the bottom protection plate is arranged at the bottom of the liquid cooling plate, and the bottom protection plate and the liquid cooling plate are arranged at intervals; the buffer layer is arranged between the liquid cooling plate and the bottom protection plate, and the bottom of the buffer layer abuts against the bottom protection plate; in the flow channel area, the top of the buffer layer abuts against the liquid cooling plate; according to the present invention, the impact force can be effectively absorbed and dispersed when the different regions of the battery pack are impacted so as to ensure that the battery cells in the battery pack are not extruded when the battery pack is subjected to the external force effect, such that the battery pack can be prevented from being damaged, and the battery pack is prevented from being damaged. And the protection level of the battery cells in the battery pack is improved, and the overall safety of the battery pack is ensured.