46results about How to "Improve life expectancy" patented technology

The invention relates to power distribution network fault processing equipment applied to the technical field of power distribution, and aims to improve the fault prediction, diagnosis and processing capabilities of a power system. The equipment comprises a pre-training module, a neural network architecture module, a data acquisition layer, an edge calculation layer, a core processing layer, a context learning module, a reasoning processing module, an output and interaction layer and a continuous learning and improvement layer, and is characterized in that a large-scale pre-trained Transform model is utilized, and professional knowledge of a power system is combined; according to the method, deep understanding and analysis of a complex power grid state are realized, through multi-source data fusion, edge calculation and central cooperative processing, the equipment can monitor the power grid state in real time, accurately predict potential faults and provide intelligent diagnosis and repair suggestions, and model pre-training and optimization are performed by adopting self-supervised learning and federated learning technologies; using reinforcement learning to optimize a fault response strategy; the interpretability of the model is realized, and the decision transparency is improved.

The invention discloses a lens structure and shooting equipment, and relates to the technical field of lenses, the lens structure comprises a mounting cylinder, a plurality of lens groups, an electromagnetic driving mechanism and a sliding fit mechanism, and the plurality of lens groups comprise an adjusting lens group movably mounted in the mounting cylinder along a first direction; the electromagnetic driving mechanism comprises an induction coil and a magnetic circuit assembly, at least part of the induction coil is located in a magnetic field formed by the magnetic circuit assembly, and when the induction coil is powered on and acts on the magnetic circuit assembly, the adjusting lens group can move relative to the mounting cylinder under the magnetic induction effect; the sliding fit mechanism comprises a rolling part and a first fit part, the first fit part can be in close contact with the rolling part, the sliding fit mechanism further comprises an adsorption part and a second fit part, and the adsorption part always acts on the second fit part to generate an acting force which is close to each other, so that the rolling part rolls in the sliding contact process of the rolling part and the first fit part. The scheme improves the problem that the lens is easy to fatigue, and improves the stability of the lens.

The invention discloses a sugarcane polyphenol composition with an anti-aging effect and application of the sugarcane polyphenol composition, and belongs to the technical field of biological medicines. The sugarcane polyphenol composition is prepared from the following components in parts by weight: 5 to 10 parts of gallic acid, 3 to 9 parts of quercitrin, 3 to 6 parts of catechol, 2 to 5 parts of rutin and 2 to 5 parts of epigallocatechin. The invention also provides an application of the sugarcane polyphenol composition in preparation of anti-aging products. According to the invention, caenorhabditis elegans is taken as a model organism for anti-aging research, experiments are carried out on the basis of an aging model and an oxidative stress model on the whole animal level, and results show that the sugarcane polyphenol composition provided by the invention can significantly prolong the life of caenorhabditis elegans under natural conditions, improve the anti-oxidative stress capability of caenorhabditis elegans, and improve the anti-aging activity of caenorhabditis elegans. The obvious anti-aging and life-prolonging effects are realized.

The invention provides a power module switching method and system based on health monitoring, and the method comprises the steps: calculating the total damage and stability reaction coefficient of each power module based on the rated parameters and operation data of a plurality of power modules; performing nonlinear calculation by taking the total damage and stability reaction coefficient of each power module as a negative correlation variable to obtain the health degree of each power module; and selecting a group of target power modules from the plurality of power modules to perform switching control by adopting a health degree priority principle. According to the method and the system, the influence of accidental faults on the health degree is reflected through the stability reaction coefficient, and the health degree is comprehensively calculated in combination with total damage, so that the health degree can balance the risk of the power module at different aging stages, and on-demand switching, health priority and service life balance of the power module of the charging pile are realized; the average life of the power module is finally prolonged and the maintenance cost is reduced.

The application provides a subway station air conditioning water system energy-saving method based on a Modelica model and a genetic algorithm, relates to the technical field of track transportation building energy optimization and intelligent control, and the method comprises the following steps: a simulation model of a subway station air conditioning water system is established in Dymola software based on a Modelica language; the established simulation model is initialized with a population, a genetic algorithm is realized by using MATLAB, a minimum total energy consumption of the air conditioning water system is taken as an objective function, and an optimal control strategy is obtained; a Dymola-MATLAB joint simulation interface is constructed by using Python according to the optimal control strategy; and the optimal control strategy of the subway station air conditioning water system is obtained by iterative optimization through the genetic algorithm according to the joint simulation interface. Through the technical path of "precise modeling-intelligent optimization-closed loop control", the application systematically solves the industry problems of "high energy consumption and difficult control" of the subway station air conditioning water system, and provides an innovative solution for the construction of intelligent track transportation.

The utility model relates to a solar cell. The above-mentioned solar cell includes the monocrystalline silicon wafer of first doped type and the first intrinsic amorphous silicon layer and the first microcrystalline silicon layer of second doped type of laminated setting on monocrystalline silicon wafer, wherein, the first intrinsic amorphous silicon layer includes first sublayer and second sublayer, and the first sublayer is between the second sublayer and the first microcrystalline silicon layer;Second sublayer contains microcrystal, and the crystallization rate of second sublayer is 1%~5%, and the thickness of second sublayer is 1.3nm~2.5nm, and second sublayer can enhance the contact effect with the first microcrystalline silicon layer, reduce the series resistance of battery, and improve the filling factor and other performance parameters of battery.

The utility model discloses a kind of high-pressure wind grid transmission roller devices for photovoltaic glass toughening, including high-pressure wind grid roller way, high-pressure wind grid roller way is installed in high-pressure wind grid;With conveying direction as by front to back, high-pressure wind grid roller way is divided into the heat-resistant roller way area of front part and the conventional roller way area of rear part, heat-resistant roller way area is made of several high heat resistance rollers, high heat resistance roller is winding asbestos rope roller, conventional roller way area is made of several winding aramid rope roller. Through the application of the utility model, when photovoltaic glass is heated by electric heating furnace and enters high-pressure wind grid, first contact the winding asbestos rope roller of heat-resistant roller way area, it is full winding asbestos rope, with more durable heat resistance, can greatly improve the overall average life of high-pressure wind grid roller way. And the installation quantity of winding asbestos rope roller is controlled to not more than three, that is, the life of high-pressure wind grid roller way can be effectively improved, and the asbestos dust evaporation amount of asbestos rope can be guaranteed.

The invention provides a silicon wafer, a preparation method of the silicon wafer, a solar cell and a photovoltaic module, and relates to the technical field of photovoltaics. The silicon wafer comprises a first surface and a second surface which are opposite; the resistivity of the first surface is smaller than that of the second surface; the change rate of the radial resistivity of the first surface and / or the second surface is smaller than or equal to 20%. Compared with the prior art, the carrier transmission performance at each position on the same surface is relatively uniform, and the transmission effect of the carriers on the surface is not reduced due to overlarge resistivity at some positions on the same surface, so that the carrier transmission in the silicon substrate of the solar cell is effectively improved, and the efficiency of the solar cell is further improved.

The present application relates to the field of photovoltaic technology, and in particular to an oxidation treatment method and a solar cell, wherein the oxidation treatment method comprises the following steps: placing a silicon wafer to be oxidized in an oxidation furnace, wherein the silicon wafer to be oxidized comprises a base layer and an emitter region disposed on the surface of the base layer; performing a primary oxidation treatment on the surface of the emitter region using oxygen that has passed through a pure water bath during the heating stage of the oxidation furnace; performing a secondary oxidation treatment on the surface of the emitter region using oxygen that has passed through a pure water bath during the constant temperature stage of the oxidation furnace; performing a tertiary oxidation treatment on the surface of the emitter region using dry oxygen during the cooling stage of the oxidation furnace, and an oxide layer is formed on the surface of the emitter region. The oxidation treatment method provided by the present application reduces the cleaning times of the oxidation furnace and the diaphragm pump while ensuring the life of the silicon wafer, thereby improving the oxidation efficiency.

The invention discloses a subway tunnel shield machine cutter, comprising a cutter ring, a bearing, a cutter body and a cutter shaft; the cutter ring is connected to the outside of the cutter body and the cutter body is rotatably connected to the cutter shaft through a bearing; the cutter ring comprises a module group, a circumferential locking member and a radial locking member; the module group is provided with a plurality of modules, all of which are sequentially connected along the circumference, so that all of the module groups are sequentially connected to form a ring; each module group comprises a plurality of fan-shaped modules, and the two end faces of each fan-shaped module are respectively provided with a positioning groove and a positioning protrusion, and the positioning protrusions of two adjacent fan-shaped modules are inserted into the corresponding positioning grooves, so that all of the fan-shaped modules of each module group are sequentially docked; the adjacent ends of each two adjacent module groups share a fan-shaped module. The invention reduces the degree of damage to the cutter ring, increases the service life of the cutter ring, and reduces construction costs.

The invention discloses a multi-dimensional positioning and damping device of a deepwater hydraulic pile hammer power station, and relates to the technical field of deepwater hydraulic piling, the multi-dimensional positioning and damping device comprises a power station, the power station is in a hollow cylinder shape, a positioning and damping cylinder is installed in the power station, and a pile hammer body middle cylinder is sleeved with the positioning and damping cylinder; a lower vertical supporting ring is installed at the bottom of the cylinder in the hammer body of the pile hammer and located below the power station. According to the device, the vertical direction positioning shock absorber, the circumferential direction positioning shock absorber and the radial positioning shock absorber are arranged, the six degrees of freedom of the positioning shock absorption cylinder relative to the middle cylinder body of the hammer body of the pile hammer in a space rectangular coordinate system are restrained in an all-around mode, and meanwhile the positioning shock absorption cylinder is allowed to move slightly in the middle cylinder body of the hammer body of the pile hammer; the impact of impact vibration of the pile hammer on a power station and other parts is reduced, the reliability of the deepwater hydraulic pile hammer is improved, and the service life of the deepwater hydraulic pile hammer is prolonged.

The invention discloses a transformer oil radiator as well as a preparation method and a packaging method thereof. The transformer oil radiator comprises two oil chamber assemblies and a radiating core assembly arranged between the two oil chamber assemblies, each oil chamber assembly comprises an oil collecting pipe and a plurality of oil chambers vertically communicated with the oil collecting pipe, the oil chambers of the two oil chamber assemblies are in one-to-one correspondence, and a plurality of flow dividing openings are formed in the oil chambers; the heat dissipation core assembly comprises a plurality of cooling pipes, and the two ends of each cooling pipe communicate with the corresponding flow dividing openings in the oil chambers correspondingly. The oil chamber and the cooling pipe are made of rust-proof high-strength aluminum alloy materials, and the oil chamber and the cooling pipe are welded through the aluminum alloy brazing technology. According to the invention, through improvement of the material and the welding mode, the internal cleanliness is ensured to the greatest extent while the light weight of the transformer oil radiator is realized, a transformer oil flushing process is adopted inside, an internal paint filling process of an old iron sheet radiator can be completely replaced, the process difficulty is reduced, the manufacturing cost is saved, a paint coating process is canceled, and the production efficiency is improved. The influence on the environment is reduced to the minimum.

The invention relates to a rigid flat membrane supporting plate and a membrane element, and relates to the technical field of sewage treatment equipment accessories. The rigid flat sheet membrane supporting plate comprises a supporting frame and a hollow plate, wherein the hollow plate is fixedly arranged in the supporting frame; the hollow plate comprises two corrugated plates which are oppositely arranged in parallel at intervals, the side face of each corrugated plate is a corrugated arc-shaped face formed by a plurality of spaced arc-shaped faces, and a platform is arranged between every two adjacent arc-shaped faces. A plurality of supporting beams are arranged between the double-side corrugated plates; a water catchment cavity is defined by the opposite arc-shaped surfaces and the adjacent supporting beams and platforms; a water collecting cavity is formed in the supporting frame and communicates with the water catchment cavity. A water producing nozzle communicated with the water collecting cavity is formed in the supporting frame. The invention further discloses a membrane element comprising the supporting plate. According to the rigid flat sheet membrane supporting plate and the membrane element, each water catchment cavity is provided with an arc-shaped side face structure, stress is effectively transmitted to a tangential face, and the mechanical performance in the flat sheet membrane is enhanced.

The application provides a rotary air preheater radial sealing gap control method, comprising the following steps: collecting target unit historical operation data set; training rotor thermal deformation prediction model based on the training sample set, and establishing gap-pressure mapping relationship library corresponding to different sealing wear stages through cold-state pressure calibration test; synchronously collecting multi-source parameters under current operation condition in real time; inputting real-time multi-source parameters into the trained rotor thermal deformation prediction model to output rotor gap prediction value under current condition; calling mapping relationship corresponding to wear stage from the gap-pressure mapping relationship library according to actual sealing operation time length, and converting the gap prediction value into pressure prediction value; setting contact pressure threshold value, combining with adjustment dead zone, overpressure / underpressure protection constraint condition, and calculating target adjustment amount of the sector plate; and controlling sector plate actuator to complete adjustment according to the target adjustment amount.

The utility model relates to a feeding device and a crystalline silicon growth furnace. The feeding device comprises a charging barrel and a lifting mechanism. The charging barrel is provided with a first end and a second end in the first direction. The lifting mechanism comprises a fixed connecting plate, a bottom cone plate and a pull rod; the fixed connecting plate is fixed at the first end of the charging barrel; the bottom cone plate is positioned at the second end of the charging barrel; one end of the pull rod penetrates through the fixed connecting plate, and the other end of the pull rod is connected with the bottom cone plate, so that the bottom cone plate moves along the first direction along with the pull rod to abut against or separate from the end face of the second end of the charging barrel; the lifting mechanism further comprises a first protection pipe and an isolation pipe which are sequentially arranged on the pull rod in a sleeving mode in the first direction, the first protection pipe abuts against the fixed connecting plate, and the isolation pipe abuts against the bottom cone plate. The first direction is parallel to the lengthwise extension direction of the pull rod. By arranging the first protection pipe and the isolation pipe, the problem that a metal structure is exposed when a silicon material is added into the charging barrel and poured into a furnace from the charging barrel is solved, all-metal protection in the charging barrel feeding process is achieved, the metal pollution risk is effectively avoided, and the product quality is improved.

The invention discloses a silicon wafer texturing additive, a texturing solution and a use method of the texturing solution, and belongs to the field of photovoltaic technology, the texturing additive comprises the following components by weight: 0.05-0.5 wt% of a nucleating agent, 0.1-3.0 wt% of a nucleating reinforcing agent, 0.2-4.0 wt% of a surfactant, 0.2-3.0 wt% of a protective agent, 0.5-6.0 wt% of a protective reinforcing agent, and the balance of deionized water. After the texturing liquid prepared from the texturing additive is used for texturing a silicon wafer, the second doped regions on the front surface and the back surface of the silicon wafer are uniform in texturing structure and low in reflectivity, and meanwhile, the PSG layer of the first doped region on the back surface of the silicon wafer is not damaged, so that the minority carrier lifetime and the open voltage of a BC battery are improved, and the photoelectric conversion efficiency of the battery is improved.

The utility model is suitable for the technical field of solar cells, and provides a silicon wafer, a solar cell, a cell module, a photovoltaic system and a silicon rod. The silicon wafer comprises a central region and corner edge regions, the conductive type of the central region is N type, and the conductive type of the corner edge regions is P type. Therefore, the conduction type of the central area of the silicon wafer is N type, and the conduction type of the corner edge area is P type, so that in the process of manufacturing the solar cell based on the silicon wafer, the P-type corner edge area can be utilized to bear pollution of copper ions to the edge of the silicon wafer, and recombination caused by pollution of the copper ions to the edge of the silicon wafer is reduced. Meanwhile, PN junctions can be formed in the silicon wafer, and after a solar cell is manufactured, a better field passivation effect can be formed in the solar cell, and carrier transmission is facilitated. Therefore, the photoelectric conversion efficiency of the solar cell prepared based on the silicon wafer can be improved.

The invention provides a front film structure of a rear texturing type back contact battery and a preparation method of the front film structure, and belongs to the technical field of solar batteries. The positive film structure comprises a silicon oxide pretreatment film layer 1, a first silicon nitride low film layer 2, a second silicon nitride low film layer 3, a first silicon oxynitride film layer 4, a silicon nitride uppermost layer 5, a second silicon oxynitride film layer 6, a third silicon oxynitride film layer 7 and a silicon oxide covering layer 8 which are sequentially arranged on the front surface of a substrate from bottom to top. Different film layers are prepared by adopting a low-temperature and low-pressure process, and the thickness of the film layers is adjusted, so that the obtained film layers are more uniform in structure, the minority carrier lifetime and the passivation value are improved to a certain extent, the reflectivity is lower, and light absorption and conversion are better realized.

The application discloses a kind of anti-chlorine salt erosion rubber modified asphalt pavement pit slot repair composite process, in view of the interface peeling caused by chlorine salt erosion in traditional repair process, short repair life problem, innovatively proposes the three-stage repair system of "debridement-interface activation-bionic filling": (1) rough interface is formed by using high-pressure cyclone debridement device to remove loose debris;(2) spray anti-chloride bonding layer containing nano-silane coupling agent, the depth of penetration reaches 3-5mm, forms chemical barrier;(3) layered filling rubber modified asphalt mixture, the gradient compaction is implemented in 30-50Hz of adjustable frequency vibrating road roller.The application improves the interface strength by molecular bonding and mechanical interlocking dual action, realizes the dual anchoring of chemical bonding and mechanical engagement effect of repair layer and original pavement, improves the interface bonding strength, prolongs the service life of repair layer, effectively solves the technical problem that pit slot repair layer is easy to debond and fails in chlorine salt environment, and is suitable for the rapid repair of pavement diseases in coastal areas and road sections where deicing agent is used a lot in winter.

The invention belongs to the technical field of microorganisms, and particularly relates to bifidobacterium adolescentis FMBL B250316 MQ capable of resisting oxidation and prolonging the service life and application of the bifidobacterium adolescentis FMBL B250316 MQ, the bifidobacterium adolescentis FMBL B250316 MQ is preserved in China Center for Type Culture Collection on September 18, 2025, the preservation number is CCTCC M 20252061, galactooligosaccharides, soybean oligosaccharides and maltooligosaccharides can be utilized, the bifidobacterium adolescentis FMBL B250316 MQ has good acid resistance, cholate resistance and antibacterial characteristics, and the bifidobacterium adolescentis The compound has the effects of resisting oxidation, resisting aging and prolonging the service life, can be used for preparing medicines for resisting oxidation, resisting aging and prolonging the service life, and has a wide application prospect.

The invention discloses a ground penetrating structure jet pump external end and a mounting structure thereof. The end comprises a top cover, a pressing structure, a flange, a base and a base plate. A base placement through hole is formed in the base plate in the direction perpendicular to the base plate plane; the base is embedded in the base placement through hole; the axis position of the base is through to form a pump core mounting channel, the lower portion of the pump core mounting channel extends outwards to form a pump shell connecting notch, and the top face of the base is concaved downwards around the pump core mounting channel to form a flange mounting concave face. The lower part of the flange is mounted in the flange mounting concave surface; the top cover is detachably connected with the base; and the pressing structure is pressed between the top cover and the pump core. According to the external end head of the jet pump with the through-ground structure and the mounting structure of the external end head, the problems of correct mounting of the designed jet pump with the through-ground structure and maintenance of nozzle abrasion and throat pipe blockage in the post-treatment radioactive feed liquid conveying process are solved.

The utility model provides a rehabilitation arm transmission mechanism and a rehabilitation arm. The rehabilitation arm transmission mechanism comprises a front arm transmission part, an upper arm transmission part and a transmission assembly arranged between the front arm transmission part and the upper arm transmission part. The transmission assembly comprises a driving disc, the center of which is installed on the upper arm transmission piece through a fixing rod; the first driving rod and the second driving rod are coaxially hinged to the two sides of the driving disc, and the hinge point deviates from the circle center of the driving disc; the third driving rod is hinged to one end, far away from the driving disc, of the second driving rod; the end, away from the driving disc, of the first driving rod is hinged to a first connecting position of the front arm transmission piece, the end, away from the second driving rod, of the third driving rod is hinged to a second connecting position of the front arm transmission piece, and the middle of the third driving rod is hinged to the upper arm transmission piece through a pivot shaft. And the lightweight and flexibility of the robot are improved.

The present invention discloses a solar cell with a composite dielectric passivation layer structure and a preparation process thereof, wherein a silicon oxide film, an aluminum oxide film, a silicon nitride or a silicon oxynitride film composite dielectric film layer are sequentially deposited on the front, back and peripheral surfaces of a P-type silicon substrate, and a window is opened locally for electrode extraction. The back surface passivation layer of aluminum oxide, silicon dioxide, silicon oxynitride, silicon nitride with different refractive indices and their laminated structures of the present invention greatly reduces the back surface recombination rate, improves the back reflectivity, and simultaneously reduces the component CTM, improves the cell light decay and thermally assisted light decay performance, and anti-PID performance; the structure can be made on boron-doped or gallium-doped P-type monocrystalline silicon, P-type polycrystalline silicon and P-type quasi-monocrystalline silicon substrates, and is compatible with the passivation method based on the composite dielectric film passivation structure for manufacturing PERC cells, double-sided PERC+ cells and shingled PERC cells; the preparation process steps and sequence of the laminated structure, the corresponding preparation method and the process parameter range can well complete the cell production.

The invention belongs to the technical field of biological medicines, and discloses a novel application of an epimedium aqueous extract, icariin and icaritin in improvement of senescence-related fat accumulation and redistribution. The invention constructs a nematode-mouse dual verification model: firstly, in a caenorhabditis elegans model, it is found that the active ingredients can significantly reduce fat droplet accumulation and triglyceride level in senescence nematode bodies, and especially under the concentration of 50 [mu] M, icariin can reduce the triglyceride content of 15-day-old senescence nematode to 37.58% of a control group. Furthermore, a naturally aged mouse is evaluated by utilizing a high-resolution Micro-CT (VivaCT 80) living body imaging technology, and three-dimensional reconstruction and quantitative analysis prove that the medicine can remarkably reduce the volume of visceral fat in the abdomen of the aged mouse, effectively improve the ratio of visceral fat to subcutaneous fat (VAT / SAT ratio) and reverse central obesity caused by aging. The raw materials are from natural plants, have no obvious toxic or side effect after long-term administration, can accurately improve fat space distribution of aging organisms, and have significant clinical application value.

The present invention provides a method for monitoring the self-management behavior of patients after interventional treatment, including calculating the patient's daily self-management behavior plan, the patient's monitoring plan for each physiological index, and the patient's daily health maintenance index; calculating the patient's daily physiological index adjustment amount and health maintenance index based on the patient's daily physiological index adjustment amount and health maintenance index; calculating the patient's daily self-management behavior adjustment strategy and health maintenance index based on the patient's daily self-management behavior adjustment strategy and health maintenance index, and calculating the patient's postoperative long-term self-management behavior optimization strategy based on the patient's daily self-management behavior adjustment strategy and health maintenance index. The present invention can optimize the health status of patients during the postoperative recovery period and maximize the overall recovery efficiency, effectively improving the patient's postoperative recovery quality and efficiency.

The invention relates to an actuator (1) with a separate actuation function, said actuator comprising: an electric drive (5) housed in an actuator housing (2), the electric drive (5) comprising a stator (6) and a drive rotor (7) rotatable about an axis of rotation (23); and a fluid transfer device (18), the transfer rotor (19) of which is connected to the drive rotor (7) for co-rotation therewith, the eccentric (32) being positioned on a drive shaft (30) via a first freewheel (31), which is connected to the transfer rotor (19) coaxially to the axis of rotation (23), the freewheel lever (34) being mounted indirectly on the output shaft (36) via a second freewheel (35), the eccentric (32) moves the freewheel lever (34) at least indirectly in an oscillating manner in the circumferential direction of the output shaft (36), and linear and / or rotationally driven actuating elements driven by the oscillating movement are guided out of the actuator housing (2).

This invention provides a back-contact solar cell, its fabrication method, and its application, relating to the field of photovoltaic technology. Specifically, the back side of the back-contact solar cell of this invention includes n... + Back contact area, and the n + The back contact region includes a gradient-doped antimony layer and a molybdenum dioxide buffer layer. Compared with the p-doped traditional BC battery, this invention achieves significant improvements in minority carrier lifetime, contact resistance, and battery efficiency. Furthermore, by combining gradient antimony doping with the molybdenum dioxide buffer layer, it breaks through the efficiency-cost balance of BC batteries, reducing mass production costs and modification expenses, thus exhibiting excellent photovoltaic performance and practical value.

The utility model discloses a roller lazy arm device with a core side-hung manhole, which comprises a rotary lazy arm and a roller device arranged on the rotary lazy arm, the lower end of the roller device is used for being connected with a manhole flange cover, and when the rotary lazy arm rotates, under the constraint of the unique degree of freedom of the manhole flange cover, the roller device is connected with the manhole flange cover. And the roller device can roll along the rotary suspension arm, so that the manhole flange cover is horizontally provided with a manhole along the unique degree of freedom. According to the utility model, the limitation that a common rotary suspension arm structure is used on low-temperature tower equipment is solved, and the novel roller suspension arm structure is utilized to meet the requirements of core body installation and normal opening and closing.

The middle cylinder structure comprises an upper cylinder body, a lower cylinder body and a connecting sleeve, the two ends of the connecting sleeve are connected with the upper cylinder body and the lower cylinder body respectively, one end of the inner wall of the connecting sleeve abuts against the outer wall of a working cylinder, and a gap is formed between the inner wall of the other end of the connecting sleeve and the outer wall of the working cylinder. A first mounting through hole is formed in the connecting sleeve which forms a gap with the outer wall of the working cylinder; and a second mounting through hole is formed in the upper cylinder body or the lower cylinder body. The middle cylinder structure has the advantages that the middle cylinder structure is formed by pressing and splicing the upper cylinder body, the lower cylinder body and the connecting sleeve, the structure is simple, machining is convenient, replacement is convenient, and the average service life of all the parts is prolonged; and meanwhile, the first mounting through hole is formed in the connecting sleeve, the design of a lower cylinder body or an upper flanging of the lower cylinder body is replaced, and then interference generated when the middle cylinder structure is mounted is reduced.

The invention provides a back contact cell, a preparation method thereof and a photovoltaic module, and relates to the technical field of solar cells, and the preparation method of the back contact cell comprises the following steps: carrying out electrochemical anodic oxidation treatment on a silicon substrate after laser film opening, and then preparing a metal electrode to obtain the back contact cell. According to the invention, an electrochemical anodic oxidation process is adopted to preferentially act on a high-activity damaged region caused by laser, the influence on a complete crystalline silicon region is extremely small, meanwhile, the defect density causing carrier recombination is reduced, the minority carrier lifetime in the cell is prolonged, an ideal and low-damage contact interface is provided for subsequent selective electroplating, and the performance of the cell is improved. And the filling factor of the BC battery can be improved.