34 results about "Intermittent heating" patented technology

The invention discloses an intelligent control method and system for latent heat defrosting, and particularly relates to the technical field of latent heat defrosting control. The method comprises the following steps that the defrosting starting time is accurately judged by establishing a multi-parameter environment sensing model, and carbon dioxide or Freon or air is selected as a heating medium; latent heat is input into the heat exchange area through the independent heating circulation path; the gravity direction of the heat exchange pipe is dynamically judged according to the platform posture, and the pipe section in the natural frost stripping direction is preferentially heated; an intermittent heating strategy based on thermal modeling is adopted to control energy consumption; when the energy is insufficient, heating is suspended, the state is recorded, and the energy is recovered for subsequent defrosting; according to the method, accurate judgment of defrosting starting, directional and efficient heating control and whole-process closed-loop management are achieved, the energy utilization efficiency, the frost layer stripping effect and the control reliability are remarkably improved, intelligence, self-adaption and restorability are achieved, and the method is suitable for meeting the requirement for stable defrosting in energy-limited and complex-environment scenes such as a high-altitude platform.

The invention belongs to the technical field of induction cookers, and discloses a low-power continuous electromagnetic heating technology and an induction cooker, the resonant frequency of an LC resonant circuit is designed to be greater than 18kHz, and a SiC MOSFET device works at a switching frequency higher than the resonant frequency, so that the low-power continuous electromagnetic heating technology is realized. The intermittent heating problem of'stop-start-stop-start 'caused by too small duty ratio during low-power heating of the existing induction cooker is effectively solved; according to the technical scheme, the power-duty ratio mapping data is obtained through the MCU module, and the duty ratio and the pulse width of the PWM signal are accurately calculated according to the target power, the target switching frequency and the timer clock frequency, so that continuous and stable energy output is realized under low power; the electromagnetic oven can effectively solve the problems of intermittent heating, unstable circuit work, increased energy consumption and noise of the existing electromagnetic oven during low-power heating.

The present application relates to the technical fields of constant temperature heating, and discloses a constant temperature bath system for enriching gas and liquid phase, which comprises a waste gas circulating device, a constant temperature device and a control device, the waste gas circulating device is used for circulating waste gas into the constant temperature device to enrich heavy metals, and the control device is used for controlling the heating mode of the constant temperature device; a collection unit is used for collecting the real-time temperature of the waste gas and the target temperature of the constant temperature device to determine the heating mode; when the temperature difference is large, a processing unit is used for intermittent heating with high power, and the maximum power and the intermittent duration of the intermittent heating with high power are determined according to the heat loss; the real-time temperatures of several positions in the constant temperature solution are collected in real time, a temperature distribution model is established, and the average temperature of the constant temperature solution is obtained; and a judging unit is used for obtaining the temperature change rate according to the average temperature at the intermittent end time and the target temperature, and determining whether to adjust the intermittent duration. The present application improves the efficiency and precision of the enrichment of heavy metals in waste gas, and reduces manual intervention through intelligent temperature control and self-adaptive adjustment.

The invention belongs to the technical field of induction cookers, and discloses a low-power continuous heating method based on a self-adaptive PPG algorithm and an induction cooker. A power switch tube is driven to work by initializing PPG parameters, collecting characteristic electrical parameters of a main loop of the induction cooker in real time, calculating characteristic error parameters, adaptively optimizing the PPG parameters and adjusting PWM signals according to the optimized PPG parameters. The problems that due to the fact that an intermittent heating mode is adopted in a low-power section of a traditional induction cooker, heating is not uniform, pot temperature fluctuation is large, noise is serious, and a fixed parameter PPG control strategy cannot adapt to nonlinearity and time-varying characteristics of a resonance system of the induction cooker can be effectively solved.

The invention discloses a soft foundation dam system rapidly built by utilizing engineering waste soil materials and a construction method thereof, and the system comprises a soft foundation dam structure built by utilizing the engineering waste soil materials, a flow state solidified soil preparation and conveying system, a hot drainage plate driving system, a foundation and an intermittent heating power supply system, the soft foundation dam structure comprises a bagged flow state solidified soil dam body, and the bagged flow state solidified soil dam body comprises a bagged flow state solidified soil cushion layer, a hot drainage plate, a bionic drainage cushion and a bagged flow state solidified soil filling body. The construction method mainly comprises the following steps of construction preparation, preparation of flow-state solidified soil slurry, filling of a first layer of flow-state solidified soil, driving of a hot drainage plate and the like, filling of a flow-state solidified soil dam body layer by layer, inner side air-closing anti-seepage construction and the like, the steps are repeated, and finally a power source is removed, and a dam top protection structure is constructed. The device has the advantages of energy conservation, environmental protection, high strength, flow state pumping and the like, solves the problem of shortage of broken stone materials, and has a wide application prospect.

The invention relates to the technical field of constant-temperature heating, and discloses a gas and liquid phase enriched constant-temperature bath system which comprises a waste gas circulating device, a constant-temperature device and a control device, the waste gas circulating device introduces waste gas into the constant-temperature device for heavy metal enrichment, and the control device controls the heating mode of the constant-temperature device; the acquisition unit acquires the real-time temperature of the waste gas and the target temperature of the constant temperature device and determines a heating mode; when the temperature difference is large, the processing unit adopts high-power intermittent heating, a heat loss value is obtained, and the maximum power and intermittent duration of high-power intermittent heating are determined; real-time temperatures of a plurality of positions in the constant-temperature solution are collected in real time, a temperature distribution model is established, and the average temperature of the constant-temperature solution is obtained; the judging unit obtains the temperature change rate according to the average temperature at the intermittent end point moment and the target temperature and judges whether the intermittent duration is adjusted or not. The waste gas heavy metal enrichment efficiency and precision are improved, and manual intervention is reduced through intelligent temperature control and self-adaptive adjustment.

The invention discloses an ultra-low power consumption control method and system for a gas detection sensor based on artificial intelligence, and relates to the technical field of gas detection, and the method comprises the following steps: obtaining the heating time of a first stage based on an optimal temperature and time threshold obtaining method; based on the normal voltage function, the abnormal voltage function and a time threshold obtaining method, obtaining a heating time interval and second-stage heating time; setting a heating mode based on the first-stage heating time, the heating time interval and the second-stage heating time, and marking the heating mode as a low-power-consumption heating mode; gas detection is carried out in a low-power-consumption heating mode; the method is used for solving the problem that reduction of power consumption and retention of detection effectiveness cannot be achieved at the same time due to the fact that intermittent heating time cannot be set based on a sensor and gas detection can be carried out in real time during intermittent heating in the prior art.

The present invention relates to a heating terminal, comprising a rack housing, a left rack shield, a right rack shield, and an upper air outlet hood. A heating plate fixing frame is provided in the middle of the rack housing, a plurality of heating plate units are fixedly installed in the heating plate fixing frame, an isolation plate is provided between two adjacent heating plate units, a protective grille is installed on the front side of the rack housing, a heat conduction heating plate is installed on the rear side of the rack housing, a cross-flow fan is installed on the upper end of the rack housing, a left rack shield is installed on the left side of the rack housing, a right rack shield is installed on the right side of the rack housing, and an upper air outlet hood is fastened to the upper end of the rack housing. The present invention uses radiation, convection, and conduction to release heat load to the heating space, is controlled by a preset intelligent temperature control unit, and adopts an intermittent heating linkage energy-saving operation mode to ensure fast energy consumption and long service life when safe, with a designed service life of up to 25,000 hours.

The application relates to the technical field of cooking control, and discloses a steam hot spring egg control method and device of an egg boiling device, which is applied to the egg boiling device, the egg boiling device comprises a main control chip, an environment temperature acquisition device and a heating body, the method comprises the following steps: detecting a function mode in which the egg boiling device is located through the main control chip; when it is detected that the function mode is a hot spring egg mode, the main control chip controls the heating body to perform a heating control operation by acquiring a target environment temperature of the egg boiling device based on a preset heating logic control algorithm; wherein the target environment temperature of the egg boiling device is acquired by the environment temperature acquisition device, the heating control operation comprises a continuous heating operation, an intermittent heating operation and a dynamic heating operation, and the heating control operation is used for controlling the steam release amount of the egg boiling device to realize temperature control of the internal environment of the egg boiling device. It can be seen that the application can shorten the cooking time of the hot spring egg by using the egg boiling device, and precise temperature control of the egg boiling device can be realized.

The invention provides a compact once-through steam generator, belongs to the technical field of heat energy recycling equipment, and aims to solve the problem that an existing heat exchanger is prone to cracking in an intermittent heat supply scene. The compact once-through steam generator comprises an outer shell (1), a heat release working medium spiral coil (2) and a heat absorption working medium input pipe (3); the outer shell (1) comprises a shell wall (11) and an inner cavity (12), the heat release working medium spiral coil pipe (2) and the heat absorption working medium input pipe (3) are both located in the inner cavity (12), a nozzle (34) is arranged at the outlet end of the heat absorption working medium input pipe (3), and a heat absorption working medium ejected by the nozzle (34) can accelerate the flowing speed of the heat absorption working medium on the outer surface of the heat release working medium spiral coil pipe (2). The compact once-through steam generator comprises the heat release working medium spiral coil, can bear stress fatigue under high frequency and large temperature difference, and can ensure safe and reliable operation.

The present invention relates to the technical field of intermittent heating and cooling, and in particular to an energy cascade convection-radiation coupled terminal system based on intermittent heating and cooling, the system comprising: a planning unit for forming a corresponding guidance model; an installation unit for forming a corresponding operating room; a sensing unit for detecting a flowing heat source; a comparison unit for updating a three-dimensional model as a new guidance model; and a control unit for switching different operating conditions of a convection terminal device and a radiation terminal device according to the number of people in each area of ​​the operating room and the number of heating devices in each area of ​​the operating room; the system of the present invention utilizes the method of setting up the above-mentioned devices to have different heat exchange effects of a convection terminal and a radiation terminal, thereby extending the use chain of each energy source, playing a role in energy conservation and emission reduction, and effectively improving the accuracy of the energy cascade convection-radiation coupled terminal system based on intermittent heating and cooling.

The invention discloses an interval heating type roasting lime kiln which comprises a shell, a combustion cavity and a calcining cavity are formed in the shell, the combustion cavity is annular, the calcining cavity is located on the inner side of the combustion cavity, and an air outlet channel is formed in the inner top of the calcining cavity; the placing net is used for placing limestone, U-shaped guide rods are fixedly connected to the inner walls of the left side and the right side of the calcining cavity, and the two U-shaped guide rods penetrate through the placing net and are in sliding connection with the placing net; and the self-driving mechanism is located in the air outlet channel. The invention further discloses a heating method of the interval heating type roasting lime kiln. In the using process of the lime kiln, heating is conducted in an interval heating mode, the purity of recycled gas can be guaranteed, in addition, gas flow formed by carbon dioxide generated during limestone calcination is used as a driving source for oxygen supply work, use of electric energy is reduced to the maximum extent, and the energy-saving effect is achieved.

A drying device based on continuous processing of bare enameled wires comprises a drying box, the two sides of the drying box are provided with a feeding port, a discharging port, a feeding frame and a discharging frame respectively, the feeding frame is provided with a feeding guide wheel set matched with the feeding port, the discharging frame is provided with a discharging guide wheel set matched with the discharging port, and the feeding guide wheel set is provided with a discharging guide wheel set matched with the discharging port. A blower device and a ventilation net are arranged on the top of the drying box, and a plurality of drying guide wheel sets and a plurality of heating pieces are arranged in the drying box. By the adoption of the structure, the Z-shaped arrangement can prolong the conveying stroke, the total length of a production line cannot be prolonged, and air drying is thorough; interval heating and uniform hot drying are matched with air blowing to enable air to rapidly flow, drying of a paint layer on the surface of the bare wire is accelerated, and the air drying efficiency is further improved; the whole device is convenient to move and arrange, connection is stable, upper and lower feeding and discharging guide positions can be adjusted, and practicability is high.

The invention discloses a residential building intermittent heating control method and system, and belongs to the technical field of building environment and energy application. The method comprises the following steps: acquiring a building envelope temperature sequence, indoor and outdoor environment data and weather forecast information through a data sensing module; the dynamic prediction module corrects weather forecast errors by using a long short-term memory (LSTM) network, constructs a multi-node thermal network model, and predicts an indoor temperature attenuation trend under a heating-free condition; the decision module evaluates the necessity of heating intervention based on the prediction result and dynamically optimizes the starting opportunity; and the optimization control module realizes adaptive optimization of model parameters through rolling prediction and deviation monitoring. The method effectively solves the problems that in the prior art, building thermal inertia quantization is insufficient, prediction deviation is large, and energy efficiency and comfort level are unbalanced, and has the advantages of being easy to implement, remarkable in energy-saving effect and wide in application range.

The application discloses an artificial intelligence-based gas detection sensor ultra-low power consumption control method and system, relates to the technical field of gas detection, and comprises the following steps: obtaining a first-stage heating time based on an optimal temperature and time threshold acquisition method; obtaining a heating time interval and a second-stage heating time based on a normal voltage function, an abnormal voltage function and a time threshold acquisition method; setting a heating mode based on the first-stage heating time, the heating time interval and the second-stage heating time, and marking the heating mode as a low-power-consumption heating mode; and performing gas detection in the low-power-consumption heating mode; and the application is used to solve the problem that in the prior art, intermittent heating time cannot be set based on the sensor itself, and gas detection cannot be performed in real time during intermittent heating, so that the problem that power consumption cannot be reduced and detection effectiveness cannot be maintained simultaneously cannot be solved.

The invention relates to the technical field of refrigeration, in particular to a refrigerator. According to the refrigerator, the memory alloy spring is arranged at the air inlet of the air duct, the memory alloy spring is heated to deform when sensing that the air temperature of the evaporation cavity rises, and the air door is driven to move to shield the air inlet. By arranging the auxiliary heating device, after the defrosting heater is started, intermittent heating is conducted on the memory alloy spring, the temperature of the memory alloy spring is rapidly increased to the complete phase change temperature, and therefore complete phase change of the memory alloy spring is achieved, and the air door is driven to close the air inlet. In this way, the speed of closing the air inlet by the air door can be increased, and the amount of defrosting heat emitted to the storage chamber through the air inlet is reduced. According to the intermittent heating mode, the situation that the memory alloy spring is heated for a long time, the overheating phenomenon is generated, and the performance of the memory alloy is damaged can be avoided; the energy consumption can be reduced; and the memory alloy spring is always in a complete phase change state, so that the state that the air inlet is closed by the air door can be kept.

The application relates to the technical field of power equipment detection, and discloses an electrical equipment flaw detection heat preservation tool and a temperature control method. The method comprises the following steps: a driving assembly mechanical phase and an air bag inflation and deflation state mapping model are established, and a rotation period is divided into exhaust and air intake intervals; a current rotation angle of a cam and an instantaneous angular velocity of a motor are collected in real time; a scavenging phase offset is dynamically calculated based on a heating plate thermal inertia constant and the angular velocity, and then a cutoff phase of a heating power supply in the exhaust interval is determined; according to a comparison result of the real-time angle and the cutoff phase, a segmented time sequence control including active power modulation, residual heat scavenging and air intake static locking is performed on the heating assembly. The rotation speed and the power dynamic matching mechanism are used to maintain the constant air outlet temperature, the time sequence offset of the airflow lagging behind the current stop is used to realize complete elimination of the residual heat, and the accumulated heat temperature rise and dry burning risk in the intermittent heating are effectively solved.

The utility model discloses an intermittent heating screw extrusion device based on electromagnetic induction, which comprises an extrusion screw and a machine barrel covered outside the extrusion screw, two ends of the machine barrel are respectively provided with a feed port and a discharge port, the extrusion screw is connected with a rotary power mechanism, and the rotary power mechanism is connected with the machine barrel. The rotary power mechanism drives the extrusion screw to rotate around the axis of the extrusion screw so that the extrusion screw can extrude materials between the machine barrel and the extrusion screw from the feeding port to the discharging port, and the machine barrel is provided with a plurality of electromagnetic heating coils independently controlling the current intensity in the axial direction of the machine barrel. When the extrusion screw rotates, magnetic induction lines of the electromagnetic heating coils are cut to generate heat to form a plurality of heating areas corresponding to the electromagnetic heating coils, and the heating areas are provided with temperature detection modules. The utility model has the advantages that the temperature is accurately regulated and controlled by a plurality of independent heating areas, the year of spinning molten materials is prolonged, the energy consumption is saved, the energy overflow is reduced, and the overall service life of the device is prolonged.

The utility model relates to the technical field of electromagnetic oven discloses power mainboard based on intermittent heating technology, include: switching power supply, surge protection circuit, IGBT drive circuit, the MCU control circuit of responsible data acquisition, the pot bottom sensor detection circuit of responsible collection pot bottom temperature data, the burning mouth, communication interface, the utility model discloses when low -power operation, electromagnetic oven enters intermittent working mode (high -frequency switch alternative open -close), avoids the equipment overheating problem caused by continuous conduction, can effectively solve the problem of IGBT high temperature, both energy -conserving, reduce invalid power consumption, reduce the whole machine energy consumption, reduce the failure rate caused by high temperature, when appearing instantaneous high pressure, MCU immediately cuts off power output, avoids the surge current impact IGBT and rectifier bridge, plays accurate real -time protection to equipment, through thermistor real -time feedback pot bottom temperature, and MCU dynamic adjustment heating power, avoid the energy waste when empty burning or overheating, improve heating efficiency.

The application discloses an in-situ conversion method of coal seams by radio frequency heating underground, and particularly relates to the technical field of coal seam pyrolysis conversion, and comprises the following steps: injecting a preset fluid to form a fracture network after drilling, and then injecting a preset first material to construct a filling structure with electromagnetic response characteristics; expanding the borehole and filling a preset second material to form a structure area; arranging a radio frequency heating device and a temperature monitoring device to obtain temperature change data; periodically and dynamically calculating a temperature change gradient coefficient and a temperature stable offset coefficient, generating a control parameter data combination based on the two through reasoning, and dynamically regulating and controlling a heating period and a power output in an intermittent heating mode; the application constructs a multidirectional permeation channel fracture network and a differential electromagnetic response structure, optimizes a radio frequency energy coupling path, improves the heating uniformity and conversion efficiency of coal seams, introduces a dynamic coefficient reasoning mechanism based on temperature data, realizes intelligent regulation and control of the intermittent heating period and power, and enhances the safety and adaptability of the system.

The present invention discloses an intelligent control method and system for latent heat defrost, which specifically relates to the technical field of latent heat defrost control, comprising the following steps: accurately judging the defrost start timing by establishing a multi-parameter environmental perception model, selecting carbon dioxide, Freon or air as a heat medium, and inputting latent heat into the heat exchange area through an independent heating cycle path; the heat exchange pipe dynamically judges the gravity direction according to the platform posture, and preferentially heats the pipe section in the natural frost stripping direction; an intermittent heating strategy based on thermal modeling is adopted to control energy consumption; when energy is insufficient, heating is suspended and the status is recorded, and defrosting is continued after energy is restored; the present invention realizes accurate judgment of defrost start, directional and efficient heating control and closed-loop management of the whole process, which significantly improves energy utilization efficiency, frost stripping effect and control reliability, has intelligence, adaptability and recoverability, and is suitable for stable defrosting needs in energy-constrained and complex environmental scenarios such as high-altitude platforms.

The present application relates to the technical field of building material maintenance, and particularly relates to a thin-layer ground repairing mortar temperature control maintenance process. The process comprises: paving a heat-conducting composite maintenance film after initial setting and forming a closed water vapor layer, and collecting the surface layer and ambient temperature of the mortar in real time; determining an initial temperature control strategy according to the difference between the surface layer temperature and the target maintenance temperature, and starting the heating unit at a corresponding power to warm up and maintain; adjusting the heating power according to the relationship between the surface layer temperature change rate and the preset temperature rise rate; obtaining the temperature difference between the surface layer and the interior, and reducing the power or switching to an intermittent heating mode when the temperature difference exceeds the threshold value to prevent cracking; and based on the comprehensive maintenance index exceeding the preset standard index, adjusting the moisture permeation amount or the maintenance time of the maintenance film according to the maintenance deviation rate. The present application realizes the self-adaptive optimization of the crack resistance, uniformity and strength in the maintenance process of the thin-layer repairing mortar through the temperature and humidity closed-loop regulation and control technology of multiple parameters.

The invention discloses a deep energy recovery system and method based on multistage serial preheating. The system comprises an intermittent heating unit, a heat transmission network, a sensor group and a controller. After the system enters a steady state cycle, when a target unit needs to be heated from a preset low temperature to a target high temperature, a controller intelligently dispatches a heat transmission network, so that the target unit sequentially and serially receives waste heat provided by other source units in the system, and multi-stage preheating is performed; and the initial temperature of the main heating stage is furthest improved. Under the ideal condition, the steady-state main heating energy consumption of the method approaches to 1 / 2 (N-1) of the basic energy consumption E0, so that the energy consumption can be greatly reduced. The method is particularly suitable for drying ovens or press clusters in the fields of PCB manufacturing, composite material forming and the like, and has huge economic and environment-friendly values.

The invention relates to the field of intelligent kitchens, in particular to an intelligent pot bottom-pasting-preventing intermittent heating method and system based on image recognition. The method comprises the following steps that a camera is used for continuously shooting kitchen photos, a pre-trained machine learning model is used for recognizing the kitchen photos, and a recognition result is obtained and comprises the position of an intelligent cooker and whether the intelligent cooker boils or not; and the intelligent cookware at the corresponding position carries out continuous heating and stopping circulation according to the duty ratio set by the user, namely the time ratio of the boiling state to the boiling stopping state, and the state data about whether boiling is carried out or not given by the machine learning model, so that the duty ratio set by the user is met. The boiling and non-boiling states of the intelligent cooker are detected by using the camera and the machine learning model, efficient intermittent heating can be realized without adding hardware, and the meal delivery time is shortened as much as possible while bottom pasting is prevented.

The application relates to the technical field of electric heating control, and discloses a temperature uniform control system and method based on a PTC electric heater, which comprises the following steps: calculating a real-time temperature difference value according to a real-time surface temperature and a preset standard temperature, obtaining a heat conduction coefficient corresponding to the PTC heater, calculating an aging influence degree value corresponding to the PTC heater according to historical working data and the heat conduction coefficient, inputting the aging influence degree value into a pre-constructed current generation model to obtain an initial heating current, determining an initial heating time according to the real-time temperature difference value, the heat conduction coefficient and the initial heating current, and finally determining a target intermittent time according to a temperature drop rate and a hot-melt effective degree; the application enables the PTC heater to enter an intermittent heating stage only when needed after continuous heating is completed, instead of being heated at fixed intervals, so that unnecessary heating processes can be reduced, and energy utilization efficiency and safety during the heating process can be improved.

The utility model relates to cooking equipment with a steaming function, which comprises an inner container and further comprises an atomizing device arranged outside the inner container and used for atomizing water; the steam inlet is formed in the inner container and used for inputting atomized steam into the inner container; the heating system is arranged in the inner container, is used for maintaining the internal temperature of the inner container at 150 DEG C and comprises a first heater arranged on the back of the inner container and a second heater arranged on the top of the inner container, the first heater is used for heating the internal temperature of the inner container to 200 DEG C and stopping working when the internal temperature of the inner container reaches 200 DEG C, and the second heater is used for heating the internal temperature of the inner container to 200 DEG C; and the second heater is used for carrying out auxiliary intermittent heating on the liner. Compared with the prior art, on one hand, the steam generating efficiency can be improved, then the cooking efficiency is improved, on the other hand, machine faults caused by cold water supplementing can be avoided, and in addition, the cooking effect can be guaranteed.

The utility model relates to the technical field of electromagnetic stove discloses can realize low -power automatic switching power mainboard, include: the switching power supply that will alternating current convert for direct current and power supply for mainboard, realize the surge protection circuit that power output is closed when grid voltage exists transient high pressure, receive the PWM control signal of MCU, and drive IGBT module high -frequency switch operation's IGBT drive circuit, the MCU control circuit that is responsible for data acquisition, the pot bottom sensor detection circuit that is responsible for gathering pot bottom temperature data, the burning -in mouth that provides MCU program burning -in interface, the communication interface for connecting power mainboard and control board, realize the resonance capacitance switching circuit of dynamic switching resonance capacitance value, the utility model satisfies user can use high -power cooking, also can realize low -power automatic switching continuous heating's function, bid farewell to the problem of previous low -power intermittent heating.

The invention discloses a preparation method of an extremely cold high-toughness steel rail based on VN microalloying. The preparation method comprises the following steps: (1) designing steel rail components in percentage by mass; (2) smelting process; (3) rolling process; (4) a heat treatment process: heating to 930 + / -20 DEG C, preserving heat for 30-45 minutes, discharging and air-cooling to 810 + / -10 DEG C, and carrying out high-pressure air cooling; controlling according to four stages of forced cooling, rapid cooling, slow cooling and natural cooling; tempering treatment: adopting a'low-temperature long-time 'tempering system: preserving heat at 200 DEG C for 6-8 hours; an intermittent heating process of keeping the temperature for 2h, cooling by 50 DEG C and heating again is adopted. Through optimal combination of the components and the process, the impact toughness of the steel rail at-60 DEG C reaches 26.4-28.9 J / cm < 2 >, the tensile strength is 1237-1275 MPa, the brinell hardness is 352-371 HB, and meanwhile, the steel rail has good welding performance and fatigue life.

The invention discloses a multistage intermittent infrared heating device and a control method thereof in the technical field of road maintenance, and the multistage intermittent infrared heating device comprises an infrared heating module, the infrared heating module is arranged in a thermal insulation protection structure, the thermal insulation protection structure is installed at the foremost end of a heating vehicle, and the infrared heating module is provided with a temperature measuring module in a matched manner; the temperature measuring module and the infrared heating module are both connected with the central control unit, and the central control unit is arranged in a cab of the heating vehicle. Road surface temperature distribution before and after heating is obtained through the temperature measuring module, heating power is dynamically adjusted through the central control unit, a three-vehicle coordinated operation mode is combined, multi-stage intermittent heating is achieved, and precise and uniform heating of the surface layer and the inner layer of the road surface in a staged mode is achieved through modular design and an intelligent temperature control algorithm.

The invention provides a compact type steam generating device, belongs to the technical field of heat energy recycling equipment, and aims to solve the problem that an existing heat exchanger is prone to cracking in an intermittent heat supply scene. The compact type steam generating device comprises an outer shell (1), a heat release working medium spiral coil pipe (2) and a heat absorption working medium input pipe (3); the heat release working medium spiral coil pipe (2) and the heat absorption working medium input pipe (3) are both located in the inner cavity (12), a nozzle (33) is arranged at the outlet end of the heat absorption working medium input pipe (3), the spraying direction of the nozzle (33) is parallel to the vertical direction, and the heat absorption working medium sprayed out of the nozzle (33) can accelerate the flowing speed of the heat absorption working medium on the outer surface of the heat release working medium spiral coil pipe (2). The compact type steam generating device comprises the heat release working medium spiral coil pipe, can bear stress fatigue under high frequency and large temperature difference, and can guarantee safe and reliable operation.