321 results about "Controlled atmosphere" patented technology

The invention relates to the technical field of environmental monitoring, in particular to a stored material controlled atmosphere maintenance early warning method and system based on environmental monitoring, and the method comprises the following steps: collecting real-time gas composition, temperature and humidity data, carrying out the time sorting of the collected data, recognizing the change trend of multiple parameters at each time point, and obtaining a parameter trend prediction result. According to the method, by combining data time sorting and change trend analysis, analyzing the relation between parameters and environment safety values and recognizing the variables exceeding the threshold value, accurate adjustment of gas, temperature and humidity is ensured, pertinence of parameter control is improved, early warning marking is carried out on the high-frequency fluctuation area through continuous monitoring and dynamic data classification, and the accuracy of the high-frequency fluctuation area is improved. The storage article quality guarantee condition monitoring capability is improved, so that article loss caused by environment change is reduced, a data analysis method and a real-time monitoring method are integrated, the operation logic of an environment controller is optimized, and the overall efficiency and the resource utilization efficiency of the system are improved.

The invention discloses a fresh commodity after-ripening regulation and control planning method oriented to maturity grading, and relates to the technical field of food science and biologication.The method comprises the steps that physiological parameters of fresh commodities are collected in real time based on a multi-modal sensor, and the physiological parameters comprise the epidermis pigment content, the ethylene release rate, the fruit hardness and the respiration intensity; the collected physiological parameters are input into a multi-objective optimization model based on deep learning, the model fuses a metabolic kinetic equation and an LSTM time sequence prediction algorithm, and a regulation and control parameter combination adaptive to the current mature stage is output; according to the regulation and control parameter combination, the temperature, the relative humidity and the O2 / CO2 concentration gradient of the controlled atmosphere storage equipment are synchronously regulated through a distributed control system, and a plant hormone antagonist is injected through an ultrasonic atomization device; and constructing a supply chain collaborative network based on a block chain technology, binding a grading result with logistics path planning, and adjusting a temperature control strategy and a shelf life countdown parameter of the cold chain transport vehicle in real time through an edge computing node.

The invention discloses a composite degradable modified atmosphere preservative film, preparation and application thereof and a cherry preservation method. The preparation method comprises the following steps: mixing copolyester PBTF, poly (butylene adipate-succinate)-terephthalate and a solvent to obtain a film casting solution, pouring the film, and drying to obtain the composite degradable modified atmosphere preservative film. The preservative film has the characteristics of high CO2 permeability and low O2 permeability, and can inhibit respiration of fruits and vegetables and slow down metabolism of the fruits and vegetables, so that the storage time is prolonged, the composite degradable controlled atmosphere preservative film is heat-sealed into a bag and is used for preserving Dalian cherries, and an excellent preservation effect can be achieved.

The invention relates to a controlled atmosphere brazed composite aluminum plate and a preparation method thereof, the controlled atmosphere brazed composite aluminum plate comprises a filler layer and a non-filler layer which are sequentially arranged, the filler layer is fused during braze welding, the non-filler layer is not fused during braze welding, the non-filler layer comprises a core layer and a corrosion protection layer, and the filler layer comprises a brazing filler metal layer; the corrosion protection layer is arranged between the core layer and the brazing filler metal layer; a base body of the corrosion protection layer is a 1XXX series aluminum alloy; the thickness of the corrosion protection layer is smaller than or equal to 40 microns and larger than or equal to the corrosion thickness in the target brazing environment; the brazing filler metal layer is filler alloy; the ratio of the thickness of the filler layer to the thickness of the non-filler layer is at most 0.2; the preparation method of the controlled atmosphere brazed composite aluminum plate comprises the working procedures of raw material preparation, hot rolling compounding, cold rolling and annealing. According to the controlled atmosphere brazing composite aluminum plate, the corrosion protection layer is arranged between the brazing filler metal layer and the core layer and can prevent the brazing filler metal layer from melting to corrode the core layer during brazing; according to the method, the degree of brazing corrosion is reduced to a great extent, and the process is simple.

The invention relates to the technical field of tobacco processing, in particular to an automatic air conditioning method and system for a three-dimensional tobacco stack.The method comprises the following steps that mildew frequency band amplitude is collected to generate gradient identification, a fermentation heat frequency band is positioned to generate an early warning instruction, oxygen concentration is extracted to generate a fan instruction, and drifting is detected to generate a nitrogen valve instruction; combining the inclination angle and the wind speed to generate an air conditioning scheme. According to the invention, through extraction of amplitude changes of microbial metabolism frequency bands and construction of difference gradient features, accurate quantification of mildew activity is realized, early recognition accuracy is improved, early warning is generated in combination with frequency band deviation frequency, abnormal response capability is enhanced, differential fan strategies are generated based on oxygen concentration and accumulation topology, and circulation efficiency is optimized. Sensor drift and humidity gradient are fused, dynamic compensation of nitrogen injection is realized, a dead angle is identified in combination with an inclination angle and a wind speed, a self-adaptive air conditioning scheme is generated, and an efficient closed-loop system from early warning to regulation is constructed.

The invention belongs to the technical field of fruit and vegetable preservation, and provides a preparation method of a silver nanoparticle / titanium dioxide / polydopamine modified montmorillonite antibacterial agent and application of the antibacterial agent in a copolyester / poly (butylene adipate-succinate)-terephthalate degradable film. The preparation method comprises the following steps: firstly preparing montmorillonite modified by polydopamine, and then mixing the montmorillonite modified by polydopamine with AgNO3 / TiO2 composite sol to prepare the antibacterial agent AgNPs / TiO2 / PMMT. The preparation method comprises the following steps: preparing an antibacterial agent, blending the antibacterial agent with PBTF and PBAT to prepare the antibacterial degradable composite air-conditioning film, and the composite air-conditioning film has antibacterial performance, excellent mechanical performance and air-conditioning performance, and can be applied to fruit and vegetable preservation.

The invention discloses a modified atmosphere preservation system and method, and aims to improve the preservation suitability of vegetables of different categories and different maturity degrees. The modified atmosphere preservation system comprises a refrigeration house, the in-warehouse sensing unit is used for collecting environmental data in the refrigeration storage in real time; the outside-refrigeration-house sensing unit is used for collecting outside-refrigeration-house environment data in real time; the respiration rate prediction unit performs fruit and vegetable respiration rate prediction calculation according to the environmental data in the refrigeration house; and the set point vector calculation unit is used for performing system energy consumption prediction calculation based on the cold storage external environment data and the cold storage internal environment data, performing optimal solution calculation of the comprehensive optimization index according to an energy consumption prediction calculation result and a fruit and vegetable respiration rate prediction calculation result, and performing optimal solution calculation of the comprehensive optimization index according to an optimal solution calculation result of the comprehensive optimization index. Outputting an optimal environment parameter set point vector; the decoupling compensation unit is used for performing error calculation according to the in-library environment data and the optimal environment parameter set point vector; and the PID control unit is used for generating a control signal according to an error calculation result.

The utility model discloses refrigeration equipment which comprises a chamber, a refrigeration system, a controlled atmosphere container, a cold air supply path, an oxygen adjusting module and an oxygen adjusting path. The controlled atmosphere container is contained in the chamber and provided with a cold air channel. The cold air supply path is communicated with the refrigerating system and the chamber and supplies cold air to the outer side of the air conditioning container, and the cold air supply path can also be communicated with the interior of the air conditioning container through the cold air channel; and the oxygen-adjusting gas path is communicated with the oxygen-adjusting module and the interior of the air-adjusting container and supplies oxygen-adjusting gas flow to the interior of the air-adjusting container. According to the refrigeration equipment, the oxygen concentration in the controlled atmosphere container can be adjusted, the cold air supply way supplies cold air to the outer side of the controlled atmosphere container, cooling of the controlled atmosphere container is achieved, and the situation that a large amount of cold air is fed into the controlled atmosphere container, consequently, the oxygen concentration in the controlled atmosphere container is greatly fluctuated, and the fresh-keeping effect is not affected is avoided; a part of cold air can be fed into the controlled atmosphere container through the cold air channel, so that condensation and frosting in the controlled atmosphere container caused by too much water vapor carried in the controlled atmosphere air flow are prevented.

The utility model provides a controlled atmosphere fresh-keeping storehouse pressure balance valve which comprises a communicating piece and a breather valve connected to the end portion of the communicating piece, the breather valve is located on the outer side of a controlled atmosphere fresh-keeping storehouse, and the breather valve is communicated with the inner space of the controlled atmosphere fresh-keeping storehouse through the communicating piece. According to the pressure balance valve, the inner space of the controlled atmosphere fresh-keeping storehouse is communicated with the breather valve located outside the controlled atmosphere fresh-keeping storehouse through the communicating piece, and the breather valve ensures that the controlled atmosphere fresh-keeping storehouse is isolated from the atmosphere within a certain pressure range and can be communicated with the atmosphere when the pressure exceeds or is lower than the pressure range; therefore, loss of cold air in the air-conditioned fresh-keeping storehouse is reduced while it is guaranteed that the cold storage door of the air-conditioned fresh-keeping storehouse is easy to open, when the pressure balance valve of the air-conditioned fresh-keeping storehouse is arranged, only the communicating piece needs to penetrate through the wall body of the air-conditioned fresh-keeping storehouse to enable the inner space of the air-conditioned fresh-keeping storehouse to be communicated with the breather valve, and the arrangement cost is reduced.

The invention discloses a relative humidity adjusting method and system for adjusting the storage environment of redried tobacco strips, and relates to the field of tobacco alcoholization. The method comprises the steps that the target balance relative humidity range of the redried tobacco strips is obtained; the target balance relative humidity range is a humidity value interval meeting the redried strip alcoholization requirement; obtaining a first target controlled atmosphere parameter of a first controlled atmosphere storage environment where the redried tobacco strips are located and a second target controlled atmosphere parameter of a second controlled atmosphere storage environment where the redried tobacco strips are located; determining a first real-time relative humidity in an environment without redried tobacco strips and a second real-time relative humidity in an environment with redried tobacco strips; determining whether a target balance relative humidity range is satisfied; and if not, determining a target controlled atmosphere parameter adjustment value, and adjusting the first target controlled atmosphere parameter and / or the second target controlled atmosphere parameter, so that the first controlled atmosphere storage environment and the second controlled atmosphere storage environment meet the target balance relative humidity range. According to the method, the alcoholization quality of the redried tobacco strips can be improved.

The invention relates to the technical field of fresh-keeping of vegetables and fruits, in particular to an air-conditioned storage and fresh-keeping method of tomatoes. The method comprises the following steps: ventilating and pre-cooling tomatoes, fumigating with 1-methylcyclopropene gas, and fumigating with ozone every 2-6 days after fumigating with the 1-methylcyclopropene gas. The tomatoes are treated through ozone in combination with 1-methylcyclopropene, the freshness and quality of the tomatoes can be kept for a long time, and the shelf life of the tomatoes is remarkably prolonged.

The invention discloses a preservation and refrigeration method of pears, which comprises the following steps: (a) pretreatment after picking, (b) stepped precooling, (c) dynamic controlled atmosphere refrigeration, and (d) regular monitoring of gas components. CaCl2 and tea polyphenol composite treatment is adopted to enhance the cold resistance and disease resistance of fruits, and the metabolic activity is gradually reduced in combination with a three-stage stepped precooling process, so that the preservation and refrigeration effects of the pears are improved; and the respiratory metabolism is precisely regulated and controlled by matching with staged dynamic air-conditioned storage. The method breaks through the bottleneck of the traditional refrigeration technology, prolongs the storage period of the pears to 6-8 months, reduces the rotting rate, is suitable for large-scale commercial preservation, and has remarkable economic value and technical advantages.

According to the method for prolonging the fresh-keeping period of the fruits by using the controlled atmosphere fresh-keeping box, the controlled atmosphere fresh-keeping box is prepared by improving the sealing performance of a common fresh-keeping box and covering a certain area of the common fresh-keeping box with a film, and the fruits are put into the box to be stored. When the area of the covering film is 20%, the lotus seeds are stored in a box, and 1-methylcyclopropene can be added; when the area of the covering film is 34.8%, the longan is placed in a box to be stored. Compared with the control, the modified atmosphere preservation box treatment can reduce the weight loss rate and browning degree of the lotus seeds and maintain the contents of Vc, amylose, total phenols and soluble solids; compared with a control group, the modified atmosphere preservation box treatment can inhibit browning of longan peel, delay reduction of soluble solids, acidity and vitamin C, inhibit increase of malondialdehyde content, reduce peroxidase activity and improve catalase activity and glutathione content. According to the technology, the shelf life of the fruits can be effectively prolonged, and the problems that an existing fresh-keeping method is tedious and short in fresh-keeping period are solved.

The invention belongs to the technical field of fresh keeping, and discloses a high-maturity small white apricot ethylene regulation and dynamic controlled atmosphere synergistic fresh keeping method which comprises the following steps: after packaging by a special net cover, pre-cooling in time, and synchronously carrying out 1-MCP fumigation and stage I controlled atmosphere treatment; a refrigerator car transportation or common car heat preservation and cold storage transportation mode is adopted, and stage II controlled atmosphere treatment is synchronously carried out in the logistics link; transferring into a modified atmosphere packaging box of which the inner surface is covered with a photocatalytic fresh-keeping coating, entering a goods shelf, and synchronously carrying out stage III modified atmosphere treatment. According to the invention, a synergetic technology of ethylene dynamic control and self-adaptive adjustment of modified atmosphere parameters is adopted, a full-chain linkage fresh-keeping technology system covering production area-logistics-shelf is constructed, and the core problems of difficulty in ethylene sensitive fresh-keeping, link splitting, high cost and the like in the small white apricot industry are solved. The technology has been applied in Xinjiang Uygur autonomous region warehouse car and wheel platform demonstration bases, the shelf life of eight-mature small white apricots reaches 10-15 days, and the intact fruit rate is 92% or above and is prolonged by 3-5 times compared with a traditional technology.

The embodiment of the invention discloses a fruit dynamic controlled atmosphere container system based on a movable module and a controlled atmosphere control method, and the method comprises the steps: monitoring the environment data of each module in real time, enabling a central control unit to dynamically dispatch the positions of the modules according to preset fruit controlled atmosphere parameters, and adjusting the parameters of a corresponding airflow channel; and differential microenvironment accurate control for different fruits is realized. According to the embodiment of the invention, the problems that the environment in a traditional controlled atmosphere container is not uniform and multiple varieties of fruits cannot be loaded and transported in a mixed manner are effectively solved, the fresh-keeping quality and the transportation efficiency are remarkably improved, and the intelligent controlled atmosphere container has the advantages of high intelligent degree, high adaptability, energy conservation and high efficiency.

The invention relates to a method for ripening perishable agricultural products during transportation in a refrigerated container or refrigerated truck or trailer (1), each comprising a controlled atmosphere system (3), the method provides a variable ripening time by changing the temperature in the container, truck or trailer (1) from a temperature at which the ripening agricultural product is maintained in a non-ripening controlled atmosphere to a temperature at which the ripening agricultural product is ripe in a controlled atmosphere. The invention also relates to a refrigerated container or refrigerated truck or trailer (1) for shipping perishable agricultural products such as fruits and vegetables, the container, truck or trailer (1) comprising: a controlled atmosphere system (3) comprising a sensor (7) capable of measuring at least one of the following parameters: temperature, O2 or CO2; the dosing mechanism (8) is used for dosing a ripening agent; and a ripening process controller (9) that controls the ripening process based on the sensed values of temperature, O2 and / or CO2.

The invention provides an intelligent controlled atmosphere control method and a related device, and belongs to the technical field of food storage. The method comprises the following steps: acquiring image information of to-be-stored food, identifying a food type, and associating a corresponding controlled atmosphere scheme according to the food type; detecting the total bacterial colony content of the to-be-stored food, and judging whether the controlled atmosphere scheme needs to be executed according to the total bacterial colony content; the to-be-preserved food is packaged and divided, if the to-be-preserved food needs to be subjected to the air conditioning scheme, the to-be-preserved food is packaged in an air conditioning device and divided to an air conditioning area, and if the to-be-preserved food does not need to be subjected to the air conditioning scheme, the to-be-preserved food and the air conditioning device are divided to an isolation area; and executing corresponding air conditioning schemes on all the air conditioning devices in the air conditioning area. Through intelligent image recognition and bacterial colony detection, precise controlled atmosphere storage of food is achieved, and the food fresh-keeping efficiency and safety are improved.

An air-conditioning fresh-keeping device and a refrigerator, the air-conditioning fresh-keeping device (41) comprising: an air-conditioning cabin housing (10) having an internal cavity; the air-conditioned cabin drawer (20) is movably connected with the internal cavity and is configured to move relative to the air-conditioned cabin shell (10) so as to be switched between a closed state in which the air-conditioned cabin drawer (20) is accommodated in the internal cavity and an open state in which at least part of the air-conditioned cabin drawer (20) is exposed out of the air-conditioned cabin shell (10); and the gas recycling and reusing mechanism (30) is connected with the controlled atmosphere cabin drawer (20) and is configured to recycle the controlled atmosphere fresh-keeping gas in the controlled atmosphere cabin drawer (20) in the process that the controlled atmosphere cabin drawer (20) is switched from the closed state to the open state. And in the process that the controlled atmosphere cabin drawer (20) is switched from the opening state to the closing state, the recycled controlled atmosphere fresh-keeping gas is released into the controlled atmosphere cabin drawer (20).

The invention discloses a preparation method of a high-hydrogen-resistance pure iron nitriding composite diaphragm, which comprises the following steps: putting a matrix into a controllable atmosphere well type nitriding furnace, raising the temperature in the controllable atmosphere well type nitriding furnace to 460-500 DEG C at the temperature raising rate of 5-15 DEG C / min, and carrying out heat preservation for 2-6 hours to nitride the matrix; the base body is placed in a uniform temperature area of a tubular vacuum heat treatment furnace, the tubular vacuum heat treatment furnace is vacuumized, the temperature in the tubular vacuum heat treatment furnace is increased to 480-520 DEG C at the speed of 5-15 DEG C / mi, and heat preservation is conducted for 0.5-2 hours; taking out the matrix after the temperature in the tubular vacuum heat treatment furnace is reduced to room temperature; the hydrogen resistance of the prepared composite diaphragm can reach 13 times that of a pure iron matrix, the performance improvement amplitude is far higher than 3 times that of single gas nitriding treatment, and the composite diaphragm has the characteristics of good mechanical stability and strong deformation resistance.

This invention relates to the field of casting technology, and more particularly to a high-strength drive wheel casting process. The steps include: Step 1, alloy material preparation; Step 2, melting and micro-alloying treatment; Step 3, mold preparation and pouring; Step 4, solidification and cooling staged control; and Step 5, heat treatment process. By optimizing the alloy composition, improving the mold structure, precisely controlling melting and pouring, and adapting the heat treatment process, this invention solves the technical problems of insufficient strength, high defect rate, and poor forming accuracy in existing drive wheels. The invention also improves the structure and adapts the cooling chamber to the process, combining a controlled atmosphere cooling chamber with a staged cooling process. It incorporates partition isolation components, waste heat recovery components, and a temperature control unit, achieving independent partitioned cooling of the casting, precise temperature control, and waste heat reuse. This solves the problems of "airflow interference, uneven cooling, and energy waste" in existing cooling chambers.

The invention discloses an airtight insect killing system and method for a tobacco storehouse, and the system comprises a control device, a nitrogen gas source, a carbon dioxide gas source, a gas inlet pipeline, a gas exhaust pipeline, a gas extraction device and a plurality of micro-differential pressure sensors, and the control device is used for controlling the gas extraction device to extract gas from all airtight tents in the ith group at the same time; when the first air pressure data in each airtight tent in the ith group reach a preset air pressure range, controlling the exhaust equipment and the exhaust valve corresponding to the ith group to be closed, and then performing air tightness detection according to the second air pressure data in each airtight tent in the ith group; the control equipment is further used for executing N preset nitrogen charging and oxygen reducing procedures after the air tightness detection is qualified; and after the oxygen content in the airtight tents of the ith group reaches a first preset content range, controlling the carbon dioxide gas source to fill carbon dioxide into the airtight tents of the ith group or put dry ice into the airtight tents of the ith group. According to the invention, the efficiency of air tightness detection, nitrogen charging and oxygen reduction and controlled atmosphere insect killing can be improved.

The invention belongs to the technical field of hickory nut storage, and discloses a hickory nut anti-oxidation storage pretreatment process and pretreatment equipment, and the process comprises the following steps: S1, sorting freshly picked and cleaned hickory nuts through the pretreatment equipment, and removing empty and shriveled seeds, bad seeds and the like; s2, screening the hickory nuts without empty and shriveled seeds, bad seeds and the like through pretreatment equipment in a unified manner to distinguish small, medium and large hickory nuts, and respectively feeding the hickory nuts into different assembly lines for spraying antioxidant and edible coating liquid; s3, the small, medium and large carya cathayensis fruits sprayed with the coating liquid enter different intelligent controlled atmosphere all-in-one machines to be subjected to controlled atmosphere treatment, and low-temperature storage is combined, so that the storage period of the carya cathayensis fruits with shells is prolonged to 6-8 months, and the storage period of the shelled carya cathayensis kernels is prolonged to 3-4 months; wherein during the controlled atmosphere treatment, the concentration of oxygen is 2-5%, the concentration of carbon dioxide is 3-5%, and the balance is nitrogen. According to the low-oxygen environment, moisture evaporation and nutrient consumption of the nuts are reduced, the freshness of the nuts can be kept, and peculiar smells caused by oxidation are avoided.

The invention belongs to the technical field of grain storage, and discloses a carbon-nitrogen composite modified atmosphere insecticidal process for grain storage, which comprises a bracket. Through cooperation of the mixing assembly, the shell and other structures, the output shaft of the motor drives the threaded conveying rod to rotate, grains and gas are conveyed to the top of the protective barrel through the threaded conveying rod, the falling radius of the grains is increased through the arc at the edge of the top of the protective barrel, and therefore the grains make better contact with the diffused gas, and the grain quality is improved. The contact time of grains and gas in the protective cylinder is prolonged, the grains completely penetrate through a filter plate and are uniformly sprayed to the top of a flow slowing plate, the grains are pushed to be a plane through a baffle, the gas adhered to the grains can be better diffused out, the baffle opens a retention assembly, the grains in contact with the gas are laid on the top layer of a grain pile, and the grain pile is more compact. The pest killing quality of the device is further improved, and meanwhile the killing time is shortened.

A curing apparatus (100) includes a housing (102) having a loading portion (108) open to ambient atmosphere, a curing portion (110) having a curing chamber (124) with a controlled atmosphere, and a transition portion (112) extending between the loading portion (108) and the curing portion (110). A carrier (128) is movable between the loading portion (108) and the curing chamber (124) via the transition portion (112). The curing apparatus (100) further includes at least one ultraviolet radiation source (150) operative for transmitting ultraviolet radiation into the curing chamber (124). The transition portion (112) includes a plurality of baffles (158) protruding from a sidewall (120) of the transition portion (112) and configured for minimizing mixing between the ambient atmosphere and the controlled atmosphere during movement of the carrier (128) between the loading portion (108) and the curing chamber (124).

System (1) for biofuel storage and having: a tank (2) configured to contain the biofuel; a thermal conditioning unit (3) configured to maintain the biofuel that is inside the tank (2) at a desired temperature; a delivery unit (6) configured to draw biofuel that is inside the tank (2) to supply the biofuel to a tank of an external user device; an atmosphere conditioning unit (4) configured to maintain inside the tank (2) a controlled atmosphere; and an additivation unit (5) configured to add at least one additive to the biofuel that is inside the tank (2).

The embodiment of the invention provides controlled atmosphere ripening equipment and a controlled atmosphere ripening method for fruits and vegetables. The controlled atmosphere ripening equipment and the controlled atmosphere ripening method are used for accurately and controllably ripening after-ripening fruits and vegetables in a transportation process. The method comprises the following steps: acquiring a current ripening agent concentration value of a ripening agent in the refrigerated container and a ripening control instruction; wherein the ripening control instruction comprises a target ripening agent concentration value, set by a user, of a ripening agent in the refrigerated container; according to the target ripening agent concentration value and the current ripening agent concentration value, the valve opening degree of an electromagnetic valve is adjusted so as to adjust and control the concentration of the ripening agent flowing through a main pipeline and entering the refrigerated container.

The invention discloses a modified atmosphere fresh-keeping storage box for vegetable packaging, and relates to the technical field of modified atmosphere fresh-keeping storage boxes. The device comprises a box body, four sets of storage chambers are attached to the interior of the box body, and gas saving assemblies are arranged on one sides of the four sets of storage chambers. A hydraulic rod drives a bearing plate to vertically move upwards along the inner wall of the box body, so that a storage chamber and a fixing block vertically move upwards along with the storage chamber, at the moment, the volume of the lower portion of the storage chamber is gradually increased, and protective gas in the storage chamber is introduced into the lower portion of the storage chamber through a separation net; the problem that a large amount of protective gas is lost when vegetables are taken is effectively avoided, the effect of storing the protective gas when the vegetables are taken can be achieved, meanwhile, the use cost of the storage box is reduced, the number of times of filling the protective gas is reduced, and the situation that the carbon dioxide concentration is too high when the vegetables are taken to cause harm to taking personnel is also avoided; and therefore, the safety coefficient of the storage box is improved.

The utility model discloses an air-conditioning fresh-keeping device and a refrigerator, and the air-conditioning fresh-keeping device comprises an air-conditioning fresh-keeping drawer which is used for storing articles needing fresh keeping; the gas conveying structure is communicated with the controlled atmosphere fresh-keeping drawer and used for conveying hydrogen to the controlled atmosphere fresh-keeping drawer, the gas conveying structure comprises a gas storage device, a gas outlet of the gas storage device is communicated with a gas inlet of the controlled atmosphere fresh-keeping drawer, and the gas storage device is used for storing the hydrogen and conveying the hydrogen to the controlled atmosphere fresh-keeping drawer; and the vacuum device is communicated with the gas storage device and is used for reducing the gas pressure in the gas storage device. According to the utility model, the problem that hydrogen is easy to escape when the hydrogen is used for controlled atmosphere fresh-keeping in the prior art is solved, so that the effective concentration maintaining time of the hydrogen in the hydrogen fresh-keeping space is prolonged, the fresh-keeping effect of fruits and vegetables is improved, and the fresh-keeping time of the fruits and vegetables is prolonged.

The utility model belongs to the technical field of food packaging, and particularly relates to a nuclear track membrane spontaneous type controlled atmosphere patch for fresh keeping of a fruit and vegetable box and the fruit and vegetable box. The spontaneous controlled atmosphere patch of the nuclear track membrane for fresh keeping of the fruit and vegetable box comprises a nuclear track membrane layer, an inner protection layer and an outer protection layer are arranged on the two sides of the nuclear track membrane layer respectively and are of a net structure, a plurality of annular adhesive layers are arranged on the side, away from the nuclear track membrane layer, of the inner protection layer, and the outer protection layer is arranged on the side, away from the nuclear track membrane layer, of the outer protection layer. Each annular adhesive layer is a single adhesive layer, each single adhesive layer is made of the same adhesive, and adjacent single adhesive layers are made of different adhesives. The modified atmosphere patch is of a three-layer structure, so that the refreshing time of fruits and vegetables can be prolonged; the fruit and vegetable box adhesive has a good bonding effect with various fruit and vegetable boxes made of different box materials, and is convenient and fast to use.

The invention relates to a three-dimensional printing machine (1) comprising a main chamber (2) which is delimited by a first wall (3) and inside which there are a main platform (5), intended to support a part (4) being printed, and a nozzle (6) designed to supply and deposit a printing material (7) in successive layers, the first wall (3) having at least one transparent main observation window (11), the main chamber (2) containing a secondary chamber (20) which is delimited by a telescopic second wall (21) provided with an insertion orifice (22), through which the nozzle (6) enters the secondary chamber (20), and a transparent secondary observation window (23) allowing an observer (25) stationed outside the main chamber (2) to view the part being printed in the secondary chamber (20).