180results about How to "Reduced mechanical properties" patented technology

The invention discloses a degradable armed acetal epoxy monomer and a preparation method thereof, the acetal epoxy monomer has the following molecular structure general formula: # imgabs0 #, in the formula, R1, R2, R3 and R4 are independently selected from one of hydrogen, methoxyl and ethyoxyl. The degradable acetal epoxy monomer is prepared through the aldol condensation reaction, the thermosetting epoxy resin prepared from the epoxy monomer and the curing agent can be rapidly degraded under the normal-pressure, mild and specific conditions, and huge economic and environmental advantages are achieved for recycling and reusing of the thermosetting resin. When the prepared degradable epoxy resin is used in thermosetting epoxy resin, under the degradation condition provided by the invention, a thermosetting epoxy resin matrix is degraded into alcohol and aldehyde with relatively small molecular weight, the mixture can be dissolved in an organic solvent, and a degradation product can be extracted through simple separation, so that the purpose of recovering the resin is achieved.

The invention relates to the technical field of coating machines, and discloses a multi-drying coating machine which comprises a supporting plate body, a base material roller, a composite drying machine and a discharging roller, the two ends of the supporting plate body are rotationally connected with the base material roller and the discharging roller respectively, the composite drying machine is arranged between the base material roller and the discharging roller, a tension shaft is arranged between the base material roller and the composite drying machine, and the tension shaft is connected with the supporting plate body. A coating mechanism is arranged on one side of the tension shaft and comprises a rotary coating roller, a supporting base and a comma scraper, a coating base material is arranged between the rotary coating roller and the supporting base, the comma scraper is arranged on one side of the rotary coating roller, and ultrasonic vibration modules are arranged on the upper side and the lower side of the comma scraper; the ultrasonic vibration module changes an electromagnetic field around the comma scraper to enable the surface of the comma scraper to generate high-frequency vibration; the high-frequency vibration of the comma scraper not only optimizes the distribution of the coating, but also enhances the interaction between the coating and the base material, and effectively promotes the contact and permeation between coating molecules and the coating base material.

The invention provides a preparation method of coaxial aerogel fiber and temperature self-adaptive protective aerogel fabric, which comprises the following steps: weighing nano-crystalline cellulose powder and dispersing in deionized water to obtain nano-crystalline cellulose dispersion suspension, weighing phase change microcapsules and dispersing in the nano-crystalline cellulose dispersion suspension to obtain phase change microcapsules; a core layer spinning mixed solution is obtained; carrying out wet spinning on the nano aramid fiber spinning stock solution and the core layer spinning mixed solution through a coaxial spinning needle, and fully solidifying in a coagulating bath to obtain coaxial gel fibers; the coaxial gel fibers are subjected to multiple times of solvent replacement treatment, then washed to be neutral and finally subjected to freeze drying treatment, and the coaxial aerogel fibers are obtained. According to the fabric, the phase change microcapsules are perfectly wrapped in the aerogel fibers, and the fabric has good heat insulation performance, good mechanical performance, excellent low-temperature and high-temperature responsiveness and a good protection effect in an extreme environment.

The invention discloses a preparation method of anti-aging cellulose insulation paper, and belongs to the technical field of oil paper insulation for electrical equipment. The problems that in the prior art, the polymerization degree of cellulose insulation paper in an oil-paper insulation system is greatly reduced, so that aging is caused, the insulation performance is reduced, and the service life is shortened are solved. The preparation method comprises the following steps: firstly, pre-treating natural color softwood pulp, grinding the softwood pulp to different degrees, and mixing the softwood pulp; secondly, purifying the mixed paper pulp, screening out fine fibers, and replacing the screened-out fine fibers with aramid nanofibers to prepare mixed paper pulp containing the aramid nanofibers; adding the mixed paper pulp containing the aramid nanofibers into a sheet making machine, performing dehydration forming and drying to obtain raw paper, and performing calendaring to obtain the cellulose insulation paper. The aging resistance and the insulating property of the cellulose insulating paper are remarkably improved, and the performance requirements of the insulating paper for the ultra-high voltage transformer can be met.

The present application relates to the field of filling glue, and in particular to a high-flowability epoxy resin encapsulated bottom filling glue and a preparation method thereof. The high-flowability epoxy resin encapsulated bottom filling glue, in parts by mass, has the following raw materials: 40 to 60 parts of epoxy resin composition, 10 to 15 parts of active diluent, 20 to 25 parts of curing agent, 1 to 2 parts of accelerator, 20 to 35 parts of modified filler, 1 to 4 parts of coupling agent, 1 to 1.5 parts of leveling agent, and 1 to 3 parts of flame retardant. The epoxy resin encapsulated bottom filling glue prepared in the present application not only has good stress impact resistance, mechanical properties and flow properties, but also can maintain excellent moisture resistance, water resistance, corrosion resistance, acid and alkali resistance and other properties, thereby greatly improving the application performance of the filling glue and having very excellent application prospects.

The invention discloses conveyor equipment convenient to clean, and belongs to the technical field of conveyors, the conveyor equipment convenient to clean comprises a conveyor body, an ash scraping mechanism is mounted on the upper surface of the conveyor body, a spraying mechanism is arranged at the bottom of the conveyor body, and a cleaning mechanism is mounted on the inner side of the spraying mechanism; a drying mechanism is installed at the position, located on one side of the cleaning mechanism, of the bottom of the conveyor body, a supporting seat is installed on one side of the conveyor body, an auxiliary belt is rotationally connected to the upper surface of the supporting seat, and two first electric air cylinders are rotationally connected to one side of the supporting seat; a piston rod of the first electric air cylinder is rotationally connected with one side of the bottom of the auxiliary belt. On the basis that materials are conveyed, the conveying belt can be cleaned, and the conveying belt can be dried.

The invention provides an ultra-high-speed electric connector which comprises an insulating body, the insulating body is provided with a lengthwise slot, a plurality of terminal slots are formed in lengthwise side walls on the two sides of the slot respectively, and a fool-proof part is arranged in the slot and used for dividing the insulating body into a power supply and low-speed signal area and a high-speed signal area which are located on the two sides of the fool-proof part; the plurality of terminals comprise differential signal terminals distributed in the high-speed signal area and other terminals distributed in the high-speed signal area and the power supply and low-speed signal area, every two differential signal terminals are adjacent, and two sides of every two adjacent differential signal terminals are respectively provided with a grounding terminal; every two adjacent differential signal terminals and two grounding terminals located on the two sides of the two differential signal terminals form a terminal module, and the two differential signal terminals and the two grounding terminals of each terminal module and an insulating block inserted into the insulating body are formed in an embedded mode. The ultra-high-speed electric connector can enable signal transmission to be better and more stable.

The invention relates to the technical field of food packaging, in particular to an antibacterial fresh-keeping packaging film for food packaging and a preparation method of the antibacterial fresh-keeping packaging film, and aims at solving the problems that a traditional food packaging film is insufficient in antibacterial performance and not ideal in fresh-keeping effect. According to the preparation method, polyethylene resin and polylactic resin are taken as main raw materials, so that the packaging film is endowed with excellent mechanical property and barrier property, the oxidation process of food can be slowed down, the damage of oxygen to the food is reduced, the loss of nutritional ingredients in the food is prevented, and the freshness and nutritional ingredients of the food can be effectively kept; the modified nano-silver particles are added into the food, so that the growth and metabolic activities of microorganisms such as various bacteria and molds can be effectively inhibited, the risk that the food is polluted by the microorganisms is remarkably reduced, the deterioration of the food due to microbial decomposition is avoided, and the food quality is improved. Therefore, the quality and taste of the food are better maintained, and the shelf life of the food is prolonged.

The utility model discloses a gantry three-coordinate measuring machine, which comprises a cross beam, the cross section of the cross beam is an isosceles right triangle, and the cross beam comprises a hypotenuse part; a first right-angle notch part and a second right-angle notch part are respectively formed at two 45-degree corner parts of the cross beam; the sliding frame comprises a sliding frame connecting plate, and the sliding frame connecting plate is parallel to the bevel edge part; a first air floating sliding block and a second air floating sliding block are arranged at the bottom of the sliding frame connecting plate, the first air floating sliding block is in sliding contact with the first intersection part, and the second air floating sliding block is in sliding contact with the bevel edge part; a third air floating sliding block and a fourth air floating sliding block are installed on the top of the sliding frame connecting plate, the third air floating sliding block is in sliding contact with the second intersection part, and the fourth air floating sliding block is in sliding contact with the bevel edge part. Through the distribution of the six air floating sliding blocks, stable, effective and symmetrical sliding support can be realized for the cross beam, so that the sliding frame moves more stably, the abrasion of the sliding frame is reduced, the motion performance is obviously improved, the motion torsional pendulum is reduced, and the measurement precision of the measuring machine is improved.

The invention discloses a calcium-containing spray for preventing grape fruit cracking and a preparation method thereof, and belongs to the field of grape fruit cracking prevention, and the calcium-containing spray comprises the following components in parts by mass: 3-9 parts of bioactive peptide-polysaccharide chelated calcium, 5-8 parts of a cationic surfactant, 1-5 parts of a water-retaining agent, 0.3-0.85 part of sodium salt, 0.01-0.5 part of a growth promoter, 0.05-1 part of potassium fulvate and 50-800 parts of deionized water. The preparation method comprises the following steps: dissolving the bioactive peptide-polysaccharide chelated calcium, the sodium salt, the growth promoter and the potassium fulvate in deionized water, and then adding the water-retaining agent and the cationic surfactant to obtain a mixed solution; stirring the mixed solution at 60-85 DEG C, and then standing to obtain the calcium-containing spray for preventing grape fruit cracking, after spraying, a layer of uniform protective film can be formed, moisture permeation and external mechanical damage can be effectively reduced, osmotic pressure balance inside and outside cells can be effectively regulated, the stability of a cell structure can be maintained, and the grape cracking rate can be remarkably reduced.

The invention discloses an RTK high-precision positioning tamper construction data management method and system, and relates to the field of tamper construction in composite foundation engineering, and the method comprises the following steps: obtaining the GPS positioning data of different working parts of a tamper through a single-machine double-GPS module, and positioning the respective position and height; processing the obtained GPS positioning data by using an RTK technology to obtain high-precision position information; and according to the high-precision position information, whether the position of the rammer deviates from the ramming pile position or not is judged in combination with construction pile position distribution diagram data, and if deviation occurs, alarm information is sent out. Through the design of the single-machine double-GPS module, the position and height information of the rammer body and the rammer can be obtained at the same time, data synchronism is guaranteed, the problems that cost is increased and information synchronization is inconsistent due to the fact that a plurality of devices are used are solved, the overall performance and stability of the devices are improved, and the practicability is high. And the requirement on multi-position information in the construction process is better met.

The invention discloses a micro-nano satellite and rocket unlocking and separating mechanism which comprises a center rotating wheel structure, N extension sliding arms and N satellite locking and releasing structures, one end of each extension sliding arm is connected with the center rotating wheel structure, and the other end of each extension sliding arm is connected with one satellite locking and releasing structure; the central runner structure controls the plurality of connecting rods to realize synchronous opening and closing; the satellite locking and releasing structure adopts a steel ball for locking and releasing, so that the satellite is prevented from popping up in advance, and the satellite locking and releasing structure has higher loading capacity; the invention provides a satellite separation speed and separation force value solving method aiming at a satellite and rocket separation speed requirement; the unlocking separation mechanism is high in synchronism, large in load, light in weight, small in size, high in reliability and capable of ensuring that a satellite is safely separated from a rocket after entering an orbit.

The invention discloses a coating material for resisting hydrogen embrittlement in a high-temperature environment and a preparation method of the coating material, diffusion and aggregation of hydrogen atoms are effectively inhibited through a multi-layer structural design, and crack propagation and mechanical property deterioration caused by hydrogen embrittlement in the high-temperature environment are remarkably reduced. According to the coating, under the synergistic effect of the composite ceramic layer, the rare earth doping layer and the metal matrix and oxide composite layer, the hydrogen permeation resistance is greatly enhanced, the oxidation resistance and the fatigue resistance are improved, internal stress accumulation is remarkably reduced, and coating falling and structure cracking are effectively prevented. The coating material can provide more reliable long-term stability and mechanical performance under harsh conditions of high temperature, high pressure, corrosive gas and frequent thermal circulation, greatly prolongs the service life of equipment, reduces the maintenance cost, and effectively improves the safety and reliability of operation.

The invention provides a passenger vehicle door anti-pinch control method and system based on visual identification. Belongs to the technical field of intelligent traffic and vehicle safety control. The method comprises the following steps: acquiring a vehicle door area video picture through a video acquisition module, and generating vehicle door area original video data; performing video preprocessing according to the original video data of the vehicle door area to generate preprocessed video data; inputting the preprocessed video data into a target recognition module, recognizing a human body or a carried object target, and generating target recognition data; performing target feature extraction according to the target identification data to generate target feature data; according to the passenger-carrying vehicle door anti-pinch control method based on visual identification, the response speed of vehicle door anti-pinch is increased, a response can be made immediately when a target just enters a dangerous area, and potential safety hazards caused by response lag are reduced.

The utility model relates to the technical field of orthopedic detection instruments, and provides an orthopedic detection platform which comprises a base, a bed body arranged on the base, a winding device and an unwinding device, the winding device and the unwinding device are arranged on the base and located at the two ends of the bed body respectively, and the winding device and the unwinding device are used for winding old cloth liners and new cloth liners respectively. The winding device comprises two stand columns arranged on the base, two first rotating shafts arranged on the two stand columns correspondingly, clamping blocks arranged at the other ends of the two first rotating shafts, a driving motor used for driving the first rotating shafts to rotate and a winding roller arranged between the two first rotating shafts, and mounting grooves are formed in the two ends of the winding roller. The clamping blocks can be inserted into the mounting grooves, at least one stand column is provided with a sliding device, and the stand columns can slide on the base through the sliding devices. According to the orthopedic detection platform, the cloth liner is automatically replaced, the workload of medical staff is relieved, the winding roller is convenient to mount and dismount, and the technical problem that disposable cloth liners are inconvenient to replace in an existing orthopedic detection platform is solved.

The utility model discloses a turnover structure and an earphone box, the turnover structure comprises a first hinge seat and a second hinge seat, and the first hinge seat is provided with a first channel communicated with an inner cavity of a box body; the second hinge seat is rotationally connected with the first hinge seat, and the second hinge seat rotates to drive the box cover to close or open the box body; the second hinge seat is provided with a second channel, and the second channel and the first channel are used for allowing a flexible conductive structure for connecting the box cover and the box body to sequentially penetrate through; the second channel is provided with a first end and a second end, the first end is communicated with the inner cavity of the box cover, and the projection of the second end in the extending direction of the first channel is located in the boundary of the cross section of the first channel in the rotating stroke of the second hinge seat. According to the utility model, the flexible conductive structure can form a gentle bending structure instead of forming a sharp break angle according to the space of the first channel and the stress condition of the flexible conductive structure. The condition of stress concentration is avoided, and the probability of mechanical fatigue or fracture damage of the flexible conductive structure is reduced.

The utility model relates to the technical field of plastic pulley production, and disclose a kind of feeding device for plastic pulley production, including bottom plate, first mounting bracket and second mounting bracket are arranged on bottom plate, supporting frame is arranged on second mounting bracket, supporting frame is arranged on the storage frame, the bottom end of storage frame is provided with mounting plate, conveying belt is arranged on first mounting bracket, conveying belt is located the side of storage frame;Adjusting assembly is arranged in storage frame, adjusting assembly includes movable plate sliding in mounting plate, the top of movable plate is provided with knob;When movable plate reciprocating sliding in mounting plate, knob pushes plastic gear shaft body in storage frame to slide on conveying belt;Conveying belt and mounting rod are rotated by servo motor synchronous drive, and the abutment transmission of cam plate and connecting plate is combined, reciprocating sliding push material is realized, cooperate the elastic reset of connecting spring, ensure that plastic gear shaft body is stably conveyed from storage frame to conveying belt, reduce feeding interruption.

The utility model provides a PC component installation auxiliary device which comprises an adjusting mechanism, a first supporting mechanism, a first supporting footstock, a second supporting mechanism, a second supporting footstock and a fixing mechanism, the fixing mechanism can be fixed on the ground, and the first supporting mechanism and the second supporting mechanism are respectively connected with the fixing mechanism in a rotating mode. The adjusting mechanism can adjust the second supporting mechanism to be horizontal and fix the PC component through the second supporting top base, and the first supporting mechanism can obliquely support the PC component and fix the PC component through the first supporting top base. The first supporting mechanism, the second supporting mechanism and the adjusting mechanism can be of a telescopic structure so as to facilitate adjustment. According to the utility model, multi-point support can be adjustably carried out on the PC component so as to quickly position and install. The device has the beneficial effects that the construction efficiency is improved, the mounting quality is improved, the hoisting operation time and the construction cost are reduced, the device is simple, the manufacturing cost is low, the mounting and dismounting are convenient, and the device can be repeatedly used.

The embodiment of the application provides a control method and device of a rod wire loop device and a storage medium, the control method comprises the following steps: determining a loop starting time of the loop device according to a rolling piece running speed of a target rolling piece and a downstream rack biting time; determining a real-time loop height value according to the loop starting time, a loop starting initial height, a steady-state target loop height and a ramp rising time, and controlling the loop device to start the loop according to the real-time loop height value; acquiring a real loop height value of the loop device, and correcting an upstream rack running speed according to the real loop height value and the real-time loop height value; and when a tail of the rolling piece leaves the upstream rack, the loop device is controlled to fall back according to a tail loop closing target height. The method realizes adaptive control of the rod wire loop.

The invention belongs to the technical field of power cables, and particularly relates to a wear-resistant, corrosion-resistant and anti-aging power cable which comprises a conductor and a conductor wrapping layer wrapping the surface of the conductor, and the surface of the conductor wrapping layer is connected with an insulating layer; the surface of the insulating layer is connected with a filling layer, the surface of the filling layer is connected with a shielding layer, the surface of the shielding layer is connected with a braid layer, the surface of the braid layer is connected with a sheath layer made of polyvinyl chloride, a protective plate is connected between the braid layer and the sheath layer, one side of the protective plate is connected with a communication plate, and the other side of the protective plate is connected with a cable. According to the power cable disclosed by the invention, the reinforcing layer which is staggered, woven and inserted into the net is coated in the filling layer, and the armor layer made of an aluminum alloy belt material is tightly coated on the surface of the cable conductor, so that the mechanical protection, corrosion resistance and tensile strength of the cable are improved; and under the condition of underground laying, the interlocking armoring can effectively resist external mechanical impact and abrasion and protect conductors in the cable from being damaged.

The invention relates to a method for efficiently preparing a high-performance material by simulating additive manufacturing, which comprises the following steps: respectively simulating green body printing and sintering processes by adopting CFD and PFS methods, cooperatively calculating green body printing and sintering process parameters, and preparing the high-performance material by adopting the obtained process parameters. The method specifically comprises the steps that CFD is adopted to simulate feed flow and green body temperature field distribution in the green body printing process, PFS is adopted to simulate green body printing pore defect evolution, and a printing temperature interval and a printing speed interval are obtained through calculation; pFS is adopted to simulate morphology evolution and rearrangement of powder particles in the sintering process and sintering microscopic structure evolution, and a sintering temperature interval is obtained through calculation; and preparing a high-performance material or product by adopting the process parameters obtained by simulation. By means of CFD and PFS collaborative simulation of green body printing defect and sintering defect evolution, optimal process parameters for eliminating defects are obtained, the high-performance material is prepared, the problems that high-performance material additive manufacturing is low in efficiency and high in cost are successfully solved, the method is simple, and large-scale production is facilitated.

The present invention belongs to the field of nuclear physics and nuclear technology application, in particular to a large curved thin-walled neutron beam window for a high-resolution neutron diffractometer in spallation neutron source technology and a manufacturing method thereof; the neutron beam window is designed as an integrated curved structure, the thickness of the beam window is designed to be 1.5 mm, and a transverse rib is provided in the middle of the neutron beam window to enhance structural stability without affecting neutron penetration; the present invention is designed as a thin-walled curved structure, so that the neutron beam window can more effectively penetrate neutrons, reduce neutron attenuation during transmission, thereby improving neutron utilization and accuracy of experimental data; at the same time, compared with a traditional planar structure, the curved surface design has better stress distribution, can effectively reduce stress concentration and mechanical deformation, improve the pressure bearing capacity and fatigue life of the neutron beam window, and ensure safe and stable operation of the experimental device.

The invention relates to a high-intensity focused ultrasound-assisted laser lift-off method, and belongs to the technical field of silicon carbide wafer lift-off. The method comprises the following steps: a, forming a modified layer: providing a silicon carbide crystal ingot, positioning a laser focus point F of a pulse laser ray L at a preset depth in the silicon carbide crystal ingot by adopting the pulse laser ray L with the wavelength permeable to the silicon carbide crystal ingot, and forming the modified layer in the silicon carbide crystal ingot by relatively moving the silicon carbide crystal ingot and the laser focus point F; and b, a wafer stripping step: providing a high-intensity focused ultrasound generating device. According to the invention, the fundamental innovation of the stripping mechanism is realized, the stripping efficiency is high, the action position is accurate, and the damage is more controllable; energy is highly concentrated and precisely acted, energy dispersion is avoided, and the stripping precision is improved; process integration is achieved through synchronous machining, the problems of secondary clamping, interface re-healing and the like are avoided, and efficiency and consistency are improved; the thermal damage and the mechanical damage are obviously reduced; by adjusting the focus position, the system can adapt to complex structures and deep modification.

The application discloses a kind of full-automatic multi-station traditional Chinese medicine granule dispensing system, the system includes dispensing platform, medicine device, medicine cabinet, mechanical arm, supply box device, load box carousel, sealing device, box outlet device, weighing device and dose visual monitoring device.Wherein, dispensing system and medicine cabinet are regular polygon layout, medicine cabinet is set around dispensing system;Mechanical arm can automatically grab medicine bottle from medicine cabinet and place on dispensing station of dispensing system, or, grab medicine bottle from dispensing station and return to medicine cabinet;Supply box device can separate and convey stacked medicine box to load box carousel, and load box carousel sequentially conveys medicine box to dispensing station.In addition, the application also discloses a kind of full-automatic multi-station traditional Chinese medicine granule dispensing method, and the dispensing method is applied to traditional Chinese medicine granule dispensing system.Wherein, the dispensing method includes continuous uninterrupted dispensing of medicine and medicine box according to prescription requirements, each medicine is placed in dispensing station immediately start medicine dispensing operation, and multiple prescriptions are processed in parallel with water flow.The application realizes the rapid automation of traditional Chinese medicine granule medicine by the integration of medicine cabinet and dispensing system regular polygon layout and continuous uninterrupted dispensing of medicine, medicine box and medicine, and realizes the parallel dispensing of multiple prescriptions with water flow, significantly reduces the complex repetitive mechanical and manual operation, and improves the dispensing efficiency of medicine.

The invention relates to the technical field of brake disc materials, and discloses a brake disc material prepared from a carbon-ceramic composite material and a processing technology thereof.The processing technology comprises the following steps that phenolic resin, carbon powder, metal oxide, composite carbon fibers and a pore forming agent are evenly mixed and then placed in a mold, and a composite material prefabricated body is obtained through compression molding and cold water demolding; processing the composite material preform to form a carbon-ceramic brake disc rough blank, and then performing carbonization treatment to obtain a carbonized composite material; and mixing the carbonized composite material with silicon powder, carrying out siliconizing treatment, soaking in a protective solution, sintering, taking out, polishing and perforating to obtain the brake disc material prepared from the carbon-ceramic composite material. The composite carbon fiber contains a large number of silicon hydroxyl groups and can be tightly combined with phenolic resin, carbon powder, metal oxide and a pore-forming agent, and the polycarbosilane layer generates a nanoscale silicon carbide phase, so that the mechanical property and wear resistance of the brake disc material prepared from the carbon-ceramic composite material can be improved.

The invention relates to a bi-crosslinking cyanate ester-epoxy blended adhesive and a preparation method thereof, and relates to the technical field of high polymer materials, the adhesive comprises the following components in parts by weight: 45-85 parts of cyanate ester resin, 5-35 parts of epoxy resin, 0-20 parts of a reactive diluent, 2-6 parts of a bi-crosslinking curing agent and 0-50 parts of a functional filler, the bi-crosslinking curing agent has the following structure: R is alkyl, aliphatic amine or aryl; r'is a primary amino group and / or a secondary amino group, R ''is-C = N and / or-OCN, m is an integer from 1 to 3, and n is an integer from 1 to 2. By adding the double-crosslinking curing agent containing the amino group and the cyano group, the technical problems of high curing temperature, large stress after curing, poor temperature resistance of epoxy resin and the like of the existing cyanate ester resin system are solved, and the curing temperature, the bonding strength and the temperature resistance of the adhesive are balanced. The adhesive can be cured at the temperature lower than 90 DEG C, and has high glass transition temperature, low thermal weight loss and excellent adhesive property.

The invention provides a cabbage head harvester with a variable-diameter leaf removing mechanism and a harvesting method. The problems that in the prior art, manual harvesting efficiency is low, and leaf removing cannot be adjusted in a self-adaptive mode according to crop sizes and irregular shapes in equipment harvesting are solved. Comprising a movable chassis, a leaf threshing and root cutting mechanism, a leaf removing mechanism and a material transferring mechanism, the movable chassis comprises a rack, and a middle through groove is formed in the front-back direction of the rack; the leaf threshing and root cutting mechanism comprises a leaf threshing assembly and a root cutting assembly, and the leaf threshing assembly and the root cutting assembly are connected into the middle barrel groove of the rack through the conveying mechanism. The leaf threshing assembly is located in front of the root cutting assembly. The leaf removing mechanism is located below the output end of the conveying mechanism. The material transferring mechanism comprises a material transferring plate and a material transferring assembly. When the material transferring assembly acts, the leaf-removed cabbage heads output from an outlet of the material transferring plate are conveyed into a material storage pool above the machine frame. The machine can not only improve the harvesting efficiency, but also adapt to green vegetable heads with different sizes and irregular shapes for leaf removal.

The present disclosure proposes a surrounding rock movement sensor for mining and a method for measuring the amount of delamination. The surrounding rock movement sensor includes a steel wire rope, and a light sensing measurement unit including a light source, a light measurement module and a measurement bar. The light source has a light output end capable of outputting light; the light measurement module and the light output end of the light source are located on the same straight line, and are used to receive and decode light signals; one end of the measurement bar is fixed to the steel wire rope, and the measurement bar is arranged between the light source and the light measurement module, and a scale code is formed on the measurement bar according to an improved Gray code engraving; wherein, when the steel wire rope is pulled, the measurement bar is driven to move, and when the measurement bar moves, the light source can be emitted through different Gray code engraved holes on the measurement bar and received by the light measurement module, and the light measurement module decodes the received Gray code information and converts the displacement of the measurement bar. The present invention can effectively improve the accuracy of delamination measurement.

The invention relates to a metal copper electrode prepared through a cold pressing method and application. Metal nano copper powder is used as a raw material; high-hardness stainless steel is adopted as a mold, the weighed powder is poured into a sleeve of the mold, an upper pressing head of the mold is placed into the sleeve, and then an oxygen pipe is led into a side hole channel of the mold; aligning an upper pressing head of the mold to the center of the pressing machine, lowering a pressing head of the hydraulic machine, opening an oxygen valve and introducing oxygen when the hydraulic machine is in contact with the upper pressing head of the mold, and then continuously applying pressure and keeping forming of the metal powder; the oxygen valve is closed while the pressure is unloaded, the pressed and formed metal copper block is taken out through a demolding device, and the taken-out metal copper block is directly used as a catalytic electrode. The prepared metal copper block is directly used as a cathode material for water electrolysis hydrogen production or used for an electrochemical hydrogen evolution reaction; and the overpotential under the current density of 10mA / cm < 2 > can be reduced by more than 50%, and is far higher than that of metal nano-copper particles which are not subjected to cold pressing processing.

This application discloses a piston-type multi-way valve and a water softener, comprising: a housing having a cavity, a first guide hole, and a second guide hole, the first guide hole communicating with the cavity; a sealing piston movably disposed within the cavity; a drive mechanism disposed on the housing; and a movable component having a first connecting portion and a second connecting portion, the first connecting portion slidably passing through the first guide hole and connected to the sealing piston, the second connecting portion being connected to the output end of the drive mechanism and slidably inserted into the second guide hole. By providing the first and second guide holes on the housing, the first connecting portion of the movable component slides within the first guide hole, and the second connecting portion of the movable component slides within the second guide hole, forming a dual-point cooperative guiding structure. This effectively limits the radial sway of the movable component during long-distance reciprocating motion, ensuring the straightness and stability of its motion trajectory, and improving the motion stability of the movable component.