134 results about "Furnace temperature" patented technology

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

This invention relates to the field of industrial frequency furnace control technology, specifically to an industrial frequency furnace temperature control cabinet and a furnace temperature control method. A data acquisition module collects real-time data on the industrial frequency power supply input voltage and furnace load current. A disturbance prediction module predicts the trend of grid voltage fluctuations or load impedance changes based on a real-time data analysis model. A control unit communicates with the data acquisition module and the disturbance prediction module, generating a thyristor trigger signal based on the output of an adaptive dual-loop controller. Based on real-time data or predicted trends, the control unit identifies whether the current disturbance source is a grid-side disturbance or a load-side disturbance. When a grid-side disturbance is identified, the adaptive dual-loop controller is adjusted to increase the regulation weight of the voltage loop, allowing the voltage loop to dominate the generation of the thyristor trigger signal to compensate for voltage fluctuations. This invention achieves precise decoupling and rapid response to dual disturbances, while simultaneously improving the long-term reliability of the system.

This invention discloses a polycrystalline silicon reduction heat energy utilization system and method. The system includes a reduction furnace body, a base, a heat exchange jacket, an internal coil in the base, an external heat exchange jacket for the return water pipe, and a flash tank assembly. The internal coil in the base has a double-layer structure and is connected by a vertical pipe. The heat exchange jacket is divided into several arc-shaped jackets with parallel branch pipes equipped with solenoid valves. The jacket is equipped with vibrating plates and flow guides. The return water pipe is fitted with a heat exchange jacket with a flow guide plate. The drain pipe and return water pipe are respectively connected to different flash tanks. The method utilizes an infrared temperature sensor linked with a solenoid valve to achieve zoned temperature measurement and flow initiation. Through temperature-controlled vibration coordination, gradient heat exchange and water collection, and tiered flash evaporation for energy supply, heat energy from different parts is recovered and multi-level steam is generated according to the temperature gradient to meet diverse steam demand. This invention constructs a multi-dimensional heat energy recovery system, achieving efficient heat energy recovery and tiered adaptive energy supply, accurately controlling the furnace temperature, improving production continuity and stability, and has significant energy-saving and practical value.

The application discloses a production method of ferrite stainless steel for mine equipment, which comprises the following steps: S1, feeding ferrite stainless steel slab after continuous casting into a holding pit for heat preservation treatment, and performing hot dressing when the surface temperature of the ferrite stainless steel slab in the holding pit is reduced to 400-450 DEG C; S2, feeding the ferrite stainless steel slab after the hot dressing into a hot rolling heating furnace for heating, controlling the furnace temperature of the hot rolling heating furnace at 1180-1210 DEG C, and controlling the furnace time at 180-220 min; S3, coarsely rolling the ferrite stainless steel slab discharged from the furnace to 28-35 mm by a furnace and roll mill, and then finely rolling to 3.0-6 mm; S4, coiling the rolled material by a coiling machine, and controlling the final coiling temperature at 650-700 DEG C; S5, performing full-hydrogen bell furnace annealing treatment on the hot-rolled black coil; S6, performing homogenizing heat treatment on the steel coil after the annealing treatment; and S7, shearing and packaging.

This invention provides a jacketed heat exchange device and a spheroidizing furnace for preparing silica powder. The jacketed heat exchange device includes a jacket body with a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange medium outlet is located at the upper part of the jacket body. An exhaust device is also provided at the upper part of the jacket body. The exhaust device includes an exhaust bend, one end of which is inserted into the jacket body and extends upward to the top surface of the internal cavity of the jacket body. The exhaust bend can fully exhaust the gas between the heat exchange medium outlet and the top surface of the jacket body, thereby improving the overall heat exchange effect of the jacketed heat exchange device and reducing safety hazards. The spheroidizing furnace equipped with this jacketed heat exchange device can precisely control the furnace temperature during silica powder preparation, reducing the problem of uneven silica particle formation caused by temperature fluctuations, significantly improving product quality consistency and production efficiency, reducing the defect rate, and increasing economic benefits.

This utility model relates to the field of industrial boiler temperature measurement technology, specifically disclosing an infrared imaging furnace temperature detection device, including a thermometer body, a display panel, and a microphone array module. The display panel is rotatably mounted on the top of the thermometer body via a hinge, and the microphone array module is fixedly mounted on the front of the display panel. The upper half of the protective frame is closed to prevent impacts from above, while the lower half is open for easy disassembly and assembly of the lens module. The air vent, through an air curtain, reduces dust and smoke contamination of the lens at the source. The cleaning scraper, made of polytetrafluoroethylene, driven by a micro-drive motor and other components, can scrape away dust and impurities from the lens surface without scratching it, ensuring lens cleanliness and guaranteeing imaging and temperature measurement accuracy. The protective frame, cleaning scraper, and other structures also optimize and protect key components such as the lens with IP65 dustproof and waterproof design from different angles, further enhancing the overall reliability and durability of the device.

This invention provides a feedforward control system for improving the control accuracy of a heating furnace, comprising: a temperature sampling device that periodically collects the temperature of the heating furnace at preset time intervals; a feedforward temperature determination device for determining a feedforward temperature based on the temperature at the previous moment and the actual temperature; a furnace temperature control device for processing the feedforward temperature using a furnace temperature PID control method to obtain a furnace temperature control quantity; and a gas supply device for adjusting the gas supply to the heating furnace according to the furnace temperature control quantity, so as to adjust the temperature of the heating furnace towards a preset target temperature. This invention solves the problem of significantly reducing temperature overshoot without sacrificing the heating furnace temperature adjustment speed.

The utility model discloses a kind of smelting furnaces based on spectral analysis on-line detection molten steel temperature, it is related to smelting furnace temperature detection technical field, its technical key points include furnace body, optical fiber pedestal and focal length adjusting cylinder, the top of furnace body is fixedly installed with lengthening cylinder, the top of lengthening cylinder is provided with lens mounting port, the inside of lens mounting port is provided with lens, the focal length adjusting cylinder includes the outer tube fixedly installed in the top of lengthening cylinder and the inner tube slidingly installed in the upper end of outer tube, the optical fiber pedestal is fixedly installed in the upper end of inner tube, the both sides of inner tube are fixedly connected with first connecting block, the outside of outer tube is fixedly connected with second connecting block, and the bottom of one of first connecting block is rotatably connected with screw rod, and the lower end of screw rod is threadedly connected with one of second connecting block. Technical effect is by setting focal length adjusting cylinder, the quick adjustment of lens focal length can be realized, and adjustment is more flexible.

The present application relates to the technical field of graphitization furnace temperature monitoring, and particularly relates to a graphitization furnace working temperature measuring device and a measuring method. The method comprises: obtaining furnace core thermocouple data, gas inlet pressure and gas mass flow rate of a protection tube during the working process of the graphitization furnace; obtaining viscosity correction flow resistance at each moment according to the thermocouple data, gas inlet pressure and gas mass flow rate at each moment; if the gas inlet pressure in a local period at a moment satisfies the pressure steady state condition and the thermocouple data satisfies the temperature reference interval, then obtaining flow resistance instantaneous fluctuation value according to the difference between the viscosity correction flow resistance at each moment in the period in which the corresponding moment is located and the overall distribution; obtaining a crack jet characteristic index by combining the flow resistance instantaneous fluctuation value and the gas inlet pressure, and then taking corresponding response actions. The present application provides reliable protection for the integrity of the thermocouple protection tube of the core temperature measuring element of the graphitization furnace, and improves the intelligent level and operation safety of the graphitization production process.

This application relates to the field of industrial furnace temperature control technology, and discloses an energy-saving brazing furnace heating process temperature adaptive control method and system. The heating process of the brazing furnace is divided into at least three continuous temperature ranges, including a first temperature range, a second temperature range, and a transition temperature range. A first power control strategy and a first temperature fluctuation tolerance are configured for the first temperature range, and a second power control strategy and a second temperature fluctuation tolerance are configured for the second temperature range. The current temperature range of the brazing furnace is determined based on the current temperature. When it is determined that the brazing furnace is currently in the first temperature range, the first power control strategy is executed to output heating power, ensuring that the characteristic temperature is within the first temperature fluctuation tolerance. When it is determined that the brazing furnace is currently in the second temperature range, the second power control strategy is executed to output heating power, ensuring that the characteristic temperature is within the second temperature fluctuation tolerance. When it is determined that the brazing furnace is currently in the transition temperature range, a smooth switching logic is executed.

This invention discloses a temperature monitoring system for a box furnace, relating to the field of industrial furnace temperature control technology. The system includes a data acquisition module, an anomaly identification module, an evaluation and analysis module, a strategy control module, and an instruction execution module. The data acquisition module acquires real-time temperature data streams from multiple zones of the box furnace, operational status data of key furnace components, and power quality data from the external power grid. The anomaly identification module uses an improved abnormal temperature point identification algorithm, combined with the spatiotemporal correlation of the furnace temperature field, to dynamically adjust the anomaly judgment threshold, accurately identifying potential abnormal temperature fluctuation patterns. The evaluation and analysis module integrates multiple types of data to generate a furnace health status assessment result. The strategy control module calculates optimized parameters for heating power, fan speed, and process duration. The instruction execution module issues control commands. This solution achieves accurate identification of the box furnace's temperature operating conditions, completes collaborative closed-loop monitoring of temperature and energy consumption, and improves the adaptability and overall performance of furnace operation control.

The application discloses a feeding and heating remote control system for manufacturing nano metal powder, which comprises internet, a switch, and a server computer, and is characterized in that the system further comprises a metal material feeding device, a client APP, a single-chip microcomputer controller, a radar liquid level meter, an infrared thermometer, a high-frequency generator, a plasma power supply, and a high-temperature evaporation device; the server computer comprises CPU programming software and nano metal powder feeding and heating automatic control software; the client APP is a nano metal powder production feeding and heating remote control software, and a control interface of the client APP comprises plasma heating control, inductance heating control, furnace temperature setting, and feeding setting; the feeding setting comprises automatic feeding and manual feeding, and the automatic feeding comprises feeding amount setting and feeding frequency setting; due to the adoption of the internet and the client APP, feeding and heating intelligentization of nano metal powder production can be realized through remote control, production personnel can be saved, occupational hazards of operating personnel under high temperature can be avoided, production cost can be reduced, and the production efficiency of the nano metal powder can be improved.

The present application relates to the technical field of metallurgical heat treatment equipment automation control, an annealing furnace electric heating control method, real-time collection of annealing furnace electric heater body temperature, strip tension signal and strip breakage signal; PLC logic determination according to the collected signal: when the strip breakage signal is detected, or the actual strip tension value is less than the tension alarm value, the electric heater is automatically turned off; when the electric heater body temperature is higher than the first alarm threshold, the electric heating power output is limited; when the electric heater body temperature is higher than the second alarm threshold, the heating is stopped; a temperature rate control model is established, and the PID set value is adjusted according to the furnace temperature segmentation: when the furnace temperature is lower than the real-time temperature set value, i.e. low temperature, the PID set value gradually increases according to the set heating rate; when the furnace temperature is higher than the real-time temperature set value, i.e. high temperature, the PID set value directly uses the operator input value. The present application also relates to the control system used in the annealing furnace electric heating control method.

This invention relates to the technical field of metallurgical heat treatment furnace maintenance methods, and discloses an online rapid replacement method for furnace rollers in heat treatment furnaces, comprising the following steps: Step 1, controlling the heat treatment furnace to a suitable working state; Step 2, replacing the cable, burner, and supporting pipeline above the furnace roller position; Step 4, removing the bearing seats at both ends of the furnace roller, and matching the broken roller removal fixture with the furnace bottom roller drive and passive end shaft head. The online rapid replacement and maintenance method for furnace rollers in heat treatment furnaces eliminates the need for maintenance personnel to enter the furnace, significantly reduces the furnace temperature drop, avoids energy losses caused by furnace shutdowns for maintenance, greatly shortens maintenance time, improves the working environment for replacing furnace bottom rollers, reduces the labor intensity of employees, solves a long-standing production problem, minimizes the production impact of replacing furnace bottom rollers, ensures steel plate output, has significant economic benefits, and has great potential for widespread application.

The present application relates to a kind of temperature automatic control system and control method of kiln production line, it is related to furnace temperature control technical field.Mainly include: according to the temperature of exhaust section, firing section temperature calculation exhaust section and the heat flow flux of firing section, according to firing section temperature and cooling section temperature calculation firing section and the heat flow flux of cooling section;Through the heat flow flux of exhaust section and firing section, calculate the gas flow of exhaust section, through the heat flow flux of firing section and cooling section, calculate the gas flow of firing section;According to the gas flow of exhaust section, calculate the combustion-supporting air flow of exhaust section, and according to the gas flow of firing section, calculate the combustion-supporting air flow of firing section;Through the gas flow of exhaust section, the combustion-supporting air flow of exhaust section adjusts the gas valve opening degree of exhaust section, combustion-supporting air fan frequency converter frequency;Through the gas flow of firing section, the combustion-supporting air flow of firing section adjusts the gas valve opening degree of firing section, combustion-supporting air fan frequency converter frequency.

This invention discloses a method for controlling the nitrogen content of molten steel in a converter with low iron consumption mode, belonging to the field of steel manufacturing technology. The method includes the following steps: controlling the molten iron inlet temperature to 1310-1330℃, controlling the silicon content in the molten iron to 0.30%-0.50%, controlling the molten iron charging ratio to 65-70%, and the scrap steel charging ratio to 30-35%; controlling the converter iron-to-steel ratio to 720-750 kg / t; after adding scrap steel into the furnace, shaking the furnace back and forth until the furnace mouth flame is normal, and baking the scrap steel; adding 50% of the slag in the first 4 minutes of the converter blowing process, and then adding the remaining slag in small amounts multiple times over 4-8 minutes, controlling the furnace temperature, and stirring the molten pool back and forth from high to low with an oxygen lance before the end point; using nitrogen-argon switching bottom blowing during the converter blowing process; adding ladle slag modifier before tapping, and then adding deoxidizer for alloying, while simultaneously performing ladle bottom blowing with argon. The control method of the present invention can control the nitrogen content of converter steel to within 40 ppm under the condition that the iron-to-steel ratio in the converter is as low as 720-750 kg / t.

The application discloses a steel plate for a nuclear power project main shaft sleeve and a production method thereof. The steel plate has the following chemical components and mass percentages thereof: C: 0.15%-0.17%, Mn: 1.35%-1.45%, Cr: 0.15%-0.20%, Nb: 0.025%-0.030%, V: 0.075%-0.080%, CEV<=0.46%, wherein CEV=C+Mn / 6+ (Cr+Mo+V) / 5+ (Ni+Cu) / 15, and the rest is Fe and inevitable impurities. The production process comprises rolling and a heat treatment process. The heat treatment process comprises the following steps: furnace loading at room temperature, furnace temperature rising, heating to 800-850 DEG C, no heat preservation, furnace discharging and air cooling. The steel plate provided by the application has low surface hardness, high strength, R p0.2 >=460MPa, R m >=590MPa, A>=21%, surface hardness HB<=192.

The application discloses a kind of furnace temperature prediction and control system based on deep learning, it is related to thermal power generation technology field.The system includes: data preprocessing module, for obtaining and processing DCS operation data, constructs historical time series data;Key parameter prediction module, using the deep learning time series prediction model of fusion quality balance, energy balance and NOx generation dynamics constraint, output the future change trend of multiple parameters;Multi-objective rolling optimization module, generate optimal control set value sequence;Instruction safety fusion module, after the safe fusion of optimization instruction and DCS original protection logic, issue and execute;And man-machine interaction and performance monitoring module.The application is through the integration framework of physical guided deep learning prediction and rolling time domain optimization, effectively solve the problem of large delay and strong coupling in thermal power unit combustion control, while improving load response speed, guarantee main steam parameter stability, improve boiler efficiency and reduce pollutant emission.

This invention discloses an energy-saving variable frequency collaborative control method for oil fume purification equipment, comprising: collecting multi-source operating data such as oxygen flux, coal quality characteristics, combustion load, furnace temperature, and pollutant generation through multi-dimensional sensing modules; inputting the processed data into a multi-variable collaborative optimization platform; and sequentially executing core steps such as collaborative temperature control model construction, combustion load prediction and simulation, and energy-saving robust optimization algorithm calculation, forming a closed-loop analysis mechanism. This method integrates multi-dimensional operating parameters, establishes a dynamic correlation between oxygen flux and combustion judgment indicators, accurately captures load change characteristics, and scientifically optimizes control parameters to adapt to complex combustion conditions. It breaks through the limitations of traditional single-variable analysis, significantly improves the pertinence and reliability of analysis results, and provides strong data support for the precise control of combustion systems. It is applicable to the operation status analysis and optimization control scenarios of various coal combustion equipment.

A press hardening method including: A. providing a steel sheet for heat treatment, being optionally precoated with an aluminum-based pre-coating, B. deposition of a hydrogen barrier pre-coating comprising chromium and not comprising nickel over a thickness from 10 to 550 nm, C. cutting the precoated steel sheet to obtain a blank, D. heat treating the blank at a furnace temperature from 800 to 970° C., during a dwell time from 1 to 12 minutes, in an atmosphere having an oxidizing power equal or higher than that of an atmosphere consisting of 1% by volume of oxygen and equal or smaller than that of an atmosphere consisting of 50% by volume of oxygen, and having a dew point between −30 and +30° C., E. transferring the blank into a press tool, F. hot-forming at a temperature from 600 to 830° C. to obtain a part, G. cooling the part.

This utility model belongs to the field of graphitization furnace temperature measurement technology, specifically relating to a negative electrode graphitization furnace core temperature measurement system, including a temperature measuring tube and a thermometer. The temperature measuring end of the temperature measuring tube passes through the outer wall of the graphitization furnace and is close to the furnace core. An optical path channel is provided along the length of the temperature measuring tube, and the thermometer measures the furnace core temperature using this optical path channel. The temperature measuring tube is connected to the outer wall by a supporting brick. The supporting brick includes a fixing part and a supporting part located below the fixing part. The fixing part and the supporting part together fasten the temperature measuring tube, and the fixing part and the supporting part are respectively fixedly connected to the outer wall. This utility model uses a supporting brick to fix the temperature measuring tube, making the temperature measuring tube and the outer wall integrated, resulting in a more secure installation of the temperature measuring tube.

The invention discloses a crucible descent growth method of a large-size bibenzyl scintillation crystal, and relates to a growth method of a bibenzyl scintillation crystal. The method aims at solving the technical problem that the quality of crystals obtained through an existing bibenzyl single crystal solution growth method is poor, a bibenzyl raw material is sealed in a quartz crucible of a capillary structure, the raw material is melted and a stable solid-liquid interface is formed by precisely controlling the temperature field of a furnace body and the descending rate of the crucible, and the bibenzyl single crystal is obtained. And then enabling the crucible to pass through a temperature gradient region at a constant rate to realize directional solidification growth of the bibenzyl single crystal, and then carrying out cooling annealing treatment. The diameter of the prepared bibenzyl scintillation crystal is 25 mm, the length of an equal-diameter section reaches 80 mm, the light-induced decay time of the bibenzyl scintillation crystal is 2.7 ns, the light yield and the decay time of the bibenzyl scintillation crystal under the excitation of a 137 Cs radioactive source are 21600 ph / Mev and 3.71 ns respectively, and the bibenzyl scintillation crystal can be used in the field of ray detection and imaging devices.

The invention relates to the technical field of magnesium metal production, in particular to a multi-stage discharging continuous magnesium metal reduction furnace and a production method.The multi-stage discharging continuous magnesium metal reduction furnace comprises a reduction tank, a grading mechanism and a discharger, the reduction tank is an equal-diameter round pipe penetrating through a furnace body in the vertical direction, and the discharger is arranged below the reduction tank; the multiple grading mechanisms are arranged in the reduction tank in a stacked mode in the vertical direction, the grading mechanism on the bottom layer is located in the discharging device, each grading mechanism comprises a reactor, and the reactors are used for collecting magnesium steam in the reduction tank. The discharger is designed to drive the grading mechanism and the materials to descend and discharge, the grading mechanism and the materials to be reacted are supplemented to the top of the reduction tank, continuous production of the magnesium reduction furnace is achieved, the single-furnace capacity is improved, and the problems that furnace temperature disturbance is large, and the service life of the reduction tank is short are solved.

The present application belongs to the technical field of metallurgical rolling, and particularly relates to a method for preventing loop fluctuation between finishing stands of sawback steel, comprising the following contents: (1) determining different residence times in the second heating section and soaking section according to the different Mo contents of each steel grade of sawback steel, and as much as possible improving the high-temperature section furnace temperature within the performance allowable range; the higher the Mo content, the longer the residence time; (2) determining the target temperature at the rough rolling outlet and the target temperature at the finishing rolling outlet in order to effectively avoid the M7C3 short rod type alloy carbide precipitation in the finishing rolling area; (3) determining the AGC compensation coefficient of each stand when the thickness precision fully meets the requirements without loop fluctuation according to the thickness of each steel grade. The method distinguishes the Mo content to determine the residence time and target furnace temperature in the high-temperature section of the heating furnace, re-determine the rough rolling outlet temperature and the finishing rolling outlet temperature, and optimizes the AGC compensation coefficient of each stand, which essentially solves the loop fluctuation problem of sawback steel during the finishing rolling in the finishing stand.

This invention belongs to the field of blast furnace gas heating furnace operation control technology, specifically disclosing a 2500m 3 The HyCROF gas-fired furnace blast furnace changeover fluctuation solution utilizes high-purity nitrogen instead of traditional decarbonized gas as the pressure equalization medium. It reconstructs a three-stage changeover process: nitrogen purging and inerting, nitrogen pressure equalization, and undisturbed gas switching. Combined with PLC system linkage control and key parameter solidification, this achieves undisturbed operation during the changeover process. This invention fundamentally solves the problems caused by traditional changeover methods, such as drastic fluctuations in gas flow and pressure, disordered gas flow distribution, excessive blast furnace pressure differential, unstable furnace temperature and molten iron quality, and safety hazards. It reduces gas flow fluctuations to ≤5%, blast furnace pressure differential fluctuations to ≤0.003MPa, and increases the smooth operation rate to 99.5%, while simultaneously reducing the fuel ratio, improving gas utilization, and eliminating safety risks.

This invention discloses an intelligent temperature control system for glass melting furnaces based on multi-parameter collaborative optimization, relating to the field of furnace temperature control technology. The system includes: acquiring multi-source operating parameters of the glass melting furnace and images of the furnace charge surface to construct a unified time-scaled operating condition sequence; extracting charge coverage information and combining it with the feed mass flow rate, glass melt level changes, and drawing speed changes to construct material endothermic state parameters; sequentially executing feedforward endothermic trigger judgment, back-end thermal diversion judgment, and composite coupling judgment to output the current control mode; and generating joint control quantities according to the control mode and correcting the temperature control parameter set. This invention achieves early identification of material-side endothermic drag, hierarchical differentiation of temperature deviation sources, and collaborative control and continuous adaptive correction of multiple channels, improving the feedforward nature, targeting, and stability of furnace temperature control.

The utility model belongs to the field of substrate glass production, concretely relates to an annealing furnace temperature process adjusting device and substrate glass annealing furnace, including two support parts one and two adjusting stop blocks, two support parts one are used for setting respectively on the furnace body of annealing furnace both sides, single adjusting stop block is slidably arranged on single support part one, the opposite end of two adjusting stop blocks is opposite and is all in the form of step, two adjusting stop blocks can be linearly moved on the corresponding support part one to make two adjusting stop blocks approach each other or be far away, and when two adjusting stop blocks approach each other to close, the stepped region of two adjusting stop blocks is overlapped. The utility model can maintain and strengthen the stability of each forming area temperature in the furnace body, thereby play the adjusting effect to the temperature in the furnace body, assist the establishment of stable temperature gradient in the furnace body, improve the stability of temperature control in the furnace body, thereby improve substrate glass production quality.

This utility model relates to the technical field of temperature control and cooling devices, and in particular to a temperature control and cooling device for rapid spheroidizing annealing of bolt steel. The device includes a furnace body, which is a cylindrical structure. Several electric heating tubes are fixedly installed through the inner wall of the furnace body, arranged in a ring along the inner wall. The terminals of the heating tubes are connected to a common electrical connector, which is a ring structure with a power interface at its outer end. This design achieves uniform heating of the bolt steel through the ring-shaped heating tubes, ensuring heating stability and avoiding localized overheating or uneven heating. Cold air is directly introduced through the cold air inlet for heat exchange, reducing the use of indirect cooling components and improving cooling efficiency. A thermometer monitors the cold air temperature in real time, and a thermocouple thermometer precisely controls the furnace temperature, ensuring the accuracy of the annealing process and thus improving the quality and efficiency of spheroidizing annealing of bolt steel.

The utility model discloses a raw material annealing furnace for screw production, including outer furnace body, furnace cover and rotation hoisting device, be equipped with inner furnace body in the outer furnace body, and form annular air channel between the outer furnace body inner side wall and the outer side wall of inner furnace body, the inner bottom portion of outer furnace body is installed with heating coil, and the inner side wall of outer furnace body is installed with several heating resistance bands, the inner top of furnace cover is fixed with installation cylinder, and installation cylinder is connected with circulating fan and fairing in proper order under, this fairing stretches into inner furnace body, install motor on the furnace cover, and the motor is connected with the impeller of circulating fan through the transmission shaft, the inner wall of inner furnace body is evenly distributed with several guide vanes that lean to the axis, and the bottom of inner furnace body is equipped with the flow -equalizing plate of open -work. The utility model discloses through the circulating fan of furnace top and conical fairing, cooperate the flow guide plate of furnace wall and the flow -equalizing plate of furnace bottom, form forced convection heat cycle in the furnace, solved the problem of traditional annealing furnace temperature distribution uneven.

This utility model discloses a device for non-powered auxiliary heating to uniformly ion-nitrided layers, belonging to the technical field of metal material heat treatment equipment. It includes a furnace hood, a base, a cathode plate mounted on the base, and a tooling plate mounted on the cathode plate. It also includes several auxiliary heating fixtures placed on the tooling plate. The height of the auxiliary heating fixtures is the same as the height of the workpiece to be nitrided or the same as the height of the nitriding fixture on which the workpiece is placed. This utility model provides a simpler, easier, and more economical auxiliary heating method. The auxiliary heating fixtures conduct heat to the outer parts, improving the problem of lower temperatures near the furnace body on the outer side, uniformizing the furnace temperature, and improving the uniformity of the ion-nitrided layer on the parts, thus ensuring the pass rate of the parts. This application requires no further equipment modifications to the nitriding furnace, and the method is simpler and more effective.