914results about How to "Stable support" patented technology

The application provides a focusing motor and a camera module. The focusing motor comprises a fixed part, a moving part, a focusing assembly, a magnetic attraction sensing part, a guide part and a position sensor. The fixed part comprises a first support arm and a second support arm connected with each other, and a light passage hole formed between the first support arm and the second support arm. The moving part is arranged in the light passage hole and can move in a preset direction. The magnetic attraction sensing part is arranged in the moving part. The angle between the magnetization direction of the magnetic attraction sensing part and the first direction and the second direction perpendicular to the preset direction is an acute angle. The guide part is arranged on the first support arm and corresponds to the magnetic attraction sensing part. The position sensor is arranged on the second support arm and corresponds to the magnetic attraction sensing part. The position sensor can generate an induction force with the magnetic attraction sensing part, so that the position sensor can sense the moving position of the moving part. The focusing motor can significantly reduce the size of the focusing motor, and can guarantee the guiding stability and the position detection precision required by the automatic focusing function while realizing the miniaturization of the camera module.

This utility model discloses a centralized transfer bracket for anti-displacement cast steel parts after production. It includes a base plate, with lifting plates fixedly connected to both sides of the base plate surface. A buffer assembly is installed on one side of the base plate's interior, and a support assembly is installed on the other side. The buffer assembly prevents the box containing the cast steel parts from bumping or knocking, while the support assembly supports the device. Through the design of the base plate, lifting plates, buffer assembly, and support assembly, when the surface of the support assembly is subjected to pressure during use, the support structure within the support assembly automatically opens to support the device. When not in use, it automatically retracts. Simultaneously, the buffer assembly also cushions the box containing the cast steel parts, preventing the box from slipping and damaging the cast steel parts during transport. This achieves the effect of reducing the space occupied by the bracket and preventing damage to the cast steel parts.

This invention belongs to the field of health pillow technology, and specifically provides an adaptive height-adjustable support frame and the adaptive height-adjustable sleep health pillow constructed therefrom. The support frame includes a base plate, a compensation edge plate, and a support panel. These three plates form an approximate "Z" structure under the action of a reset elastic element and a hinge element. The support panel is configured as a support surface that can switch between an inclined position and a flat position relative to the base plate. The health pillow includes a pillow cushion, a pillowcase, and the aforementioned support frame. The pillow cushion is installed on the support panel of the support frame, and the pillowcase is placed over the pillow cushion and the support frame. This health pillow structure can not only automatically adjust its vertical displacement according to the pressure of the head and neck, but also adaptively adjust the support surface according to the sleeping posture to ensure that it is continuously and closely fitted to the physiological curve of the human head and neck, improving the support force for the neck and head, maintaining the physiological curvature of the neck, and relieving shoulder and neck pain with long-term use, reducing the probability of stiff neck, neck fatigue, and chronic strain.

This utility model relates to a gear radial runout detection device, comprising: a base with a test space provided on the base; a radial runout drive mechanism movably mounted on the base, the output end of which extends into the test space and is equipped with a drive gear; a positioning shaft assembly movably mounted on the base for mounting the gear to be tested within the test space; an adjustment mechanism mounted on the base and connected to the radial runout drive mechanism for adjusting the position of the radial runout drive mechanism on the base to engage the drive gear with the gear to be tested; and a detection mechanism located on the side of the base, including a bracket and an adjustable dial indicator mounted on the bracket, the dial indicator's detection head abutting the tooth surface of the gear to be tested. The radial runout drive mechanism of this utility model drives the rotation of the drive gear, causing the gear to be tested, which is meshed with it, to rotate synchronously, simulating the actual working state of the gear to be tested and ensuring the accuracy of the radial runout detection results.

The utility model relates to the technical field of railway vehicles, disclose integrated shock absorber mounting seat and train bogie, this integrated shock absorber mounting seat includes riser, fixed plate and support component, the riser is opened with the plug groove and mounting hole, the fixed plate is fixedly plugged in the plug groove, can be fixed relative to the riser under the action of plug groove, and the connection is stable, the fixed plate is opened with the connecting hole, first buckling plate and second buckling plate are located at both sides of fixed plate respectively and are fixedly connected in the edge of riser, first buckling plate is butt joint in the first end surface of fixed plate, second buckling plate is butt joint in the second end surface of fixed plate, further improve the stability of fixed plate relative to the riser connection, not easy to break, and the supporting is strong, realized the integration installation of anti-snake oil pressure shock absorber and two vertical oil pressure shock absorber, compact structure, optimize the installation space to the realization of anti-lateral roll torsion bar through the frame crossbeam can be realized, improve the installation reliability of anti-lateral roll torsion bar.

This invention discloses a two-component PU / SIS injectable hydrogel material and its preparation method. The preparation method includes the following steps: S1. Preparing an isocyanate-terminated aqueous polyurethane prepolymer solution; S2. Preparing an aminated SIS porous microsphere suspension; S3. Dispensing component A and component B into a dual-syringe or parallel syringe, and sterilizing them to obtain the two-component PU / SIS injectable hydrogel material. The two-component PU / SIS injectable hydrogel material prepared by this invention can be conveniently injected subcutaneously or deeply using a standard syringe, and can rapidly form a stable gel with excellent mechanical support and degradation resistance in situ. It can meet the requirements of an ideal soft tissue filler material and is expected to further broaden the application of SIS in medical aesthetic soft tissue filling and repair.

This invention belongs to the field of data prediction technology, and provides a method and system for predicting solidification cracks in alloy welding. The method includes: acquiring the thermophysical parameters, scanning speed, and horizontal and vertical distances from the solidification point to the welding point of the alloy to be tested; calculating the theoretical angle between the scanning speed direction and the normal to the fusion line based on the horizontal and vertical distances from the solidification point to the welding point; establishing a continuous growth limiting factor calculation model based on the thermophysical parameters, scanning speed, and theoretical angle, and determining the derivative expression model between the solid-liquid interface temperature and the square root of the solid fraction; establishing a crack sensitivity index calculation model based on the continuous growth limiting factor calculation model and the derivative expression model; converting the crack sensitivity index calculation model into a data curve, and obtaining the welding solidification crack prediction result based on the data change characteristics of the target segment in the data curve. This scheme has a simple calculation process, strong engineering applicability, and improves the accuracy of solidification crack prediction.

This invention provides a surface acoustic wave (SAW) filter, comprising a piezoelectric layer and interdigitated electrodes. The interdigitated electrodes are disposed on the piezoelectric layer and include at least a first metal layer and a second metal layer stacked together. The first metal layer is made of platinum or an alloy with platinum as the main component, and the second metal layer is made of aluminum or an alloy with aluminum as the main component. By setting the material of the second metal layer to aluminum or an alloy with aluminum as the main component, the uniformity of metal coverage of the electrode structure can be effectively improved, avoiding excessive local resistance or structural defects caused by poor coverage. Setting the material of the first metal layer to platinum or an alloy with platinum as the main component provides reliable support for the second metal layer, reducing the risk of deformation or corrosion of the aluminum layer in subsequent processes. By using a stacked structure of two complementary materials for the interdigitated electrodes, both structural miniaturization and improved overall electrical performance and structural reliability of the interdigitated electrodes are achieved.

The application provides a kind of operation and maintenance scene visualization report generation method and system based on natural language question and answer, belongs to intelligent operation and maintenance technical field, method includes: receiving the natural language query input by user;Through the pre-training of large language model and the preset operation and maintenance terminology dictionary, the natural language query is parsed and entity is extracted, and the entity-field association table containing demand type is generated;According to demand type and semantic feature, the query type is judged to be data query or visual query;Based on the judgment result, generate structured query language sentence or visual instruction;Query is executed to the interface business database to obtain raw data;Raw data is processed and analyzed to obtain analysis result data;Call data feature adaptation algorithm to match chart type, generate and output visual report.The application realizes the full-link automation from natural language input to visual report output, reduces the operation and maintenance data interaction threshold, improves the operation and maintenance data processing efficiency and accuracy.

The utility model discloses a dynamic muscle nature's neck rehabilitation training brace relates to medical rehabilitation instrument technical field, and the utility model discloses a cape, and the both sides of cape outer surface and the both sides of back are all provided with servo motor and take off and put on the roll, and four servo motor output all are connected with worm, and four take off and put on the back of roll all are connected with worm wheel, and the top of cape is connected with head hoop through a plurality of ball head seat. The utility model discloses the setting of servo motor, worm, worm wheel, take off and put on the roll and first pull rope, and four servo motor outputs are driven four take off and put on the roll rotation respectively through four worms and four worm wheel meshing, thereby being convenient for to take off or put out to first pull rope, second pull rope, third pull rope and fourth pull rope, when first pull rope and second pull rope take off and third pull rope and fourth pull rope put out, make the head of patient to the right side of self inclination, do not need medical staff or family member manual traction patient head and make neck movement, and the operation is time -saving and labor -saving.

The present application relates to the technical field of transport box, and discloses a transport box for egg circulation, which comprises a box body, a bottom plate arranged under the box body and used for supporting egg trays, a locking member movably arranged on the bottom plate and having a locking state and an unlocking state, a pushing assembly in transmission connection with the locking member, and a driving assembly used for driving the pushing assembly to move and switch the locking member between the locking state and the unlocking state. When the locking member is in the locking state, the box body is fixed relative to the bottom plate. When the locking member is in the unlocking state, the box body can be separated from the bottom plate. The transport box for egg circulation can realize overall loading and unloading through the separable design of the bottom plate and the box body. When loading, all the trays can be stacked on the bottom plate, and then the box body is buckled. When unloading, the box body can be lifted to expose the trays integrally, so that the loading and unloading time is greatly shortened, and the transport box is suitable for cooperation with automatic handling equipment and can realize rapid and batch circulation.

The utility model discloses a kind of automobile driving simulator support devices, belong to automobile driving simulator auxiliary tool technical field.The support device includes support column, upper positioning piece, lower positioning piece and locking mechanism, wherein:upper positioning piece and lower positioning piece are U-shaped groove structure;The upper end of support column is connected with the outer bottom surface of upper positioning piece, and the bottom plate of upper positioning piece is not perpendicular to support column and is inclined to its side;The lower end of support column is connected with the outer bottom surface of lower positioning piece, and the bottom plate of lower positioning piece is perpendicular to support column;Locking mechanism is arranged on support column, for locking the cross bar in upper positioning piece;The lower edge of both side plates in lower positioning piece is equipped with limit plate, and limit plate is inclined to one side of lower positioning piece.According to the above design, the utility model can quickly support the main body of automobile driving simulator, and will not easily slip, and the supporting effect is excellent.

The utility model relates to a relax training kit, include: support frame (1) is supported on ground, human body support frame (2) is supported on support frame (1), and can be in support frame overturn, realize driving training personnel to form the inverted state and carry out the vertebra body traction training, support frame (1) is equipped with support limiting rod (3), is used for limiting the initial position and overturning range of human body support frame (2), the length of human body support frame (2) is adjustable. According to the scheme of the utility model, the utility model can realize the overturning of training personnel and thus realize the traction training to the vertebra body. In the process of traction training, training personnel can be stably and firmly supported on the instrument, and there is no risk of falling off. Moreover, the overturning range of training personnel is controlled, and training personnel can quickly leave the instrument according to their own wishes, ensuring the efficiency and safety of training.

The utility model discloses a kind of cantilever warehouse roof plate support structures, including U-shaped plate and with its vertical setting I-beam seat, the end of the I-beam seat is welded with bottom plate, and bottom plate and U-shaped plate are all correspondingly provided with preset hole, expansion bolt for being anchored with warehouse wall is arranged in preset hole, the top of the I-beam seat is provided with detachable limiting mechanism. In the utility model, I-beam seat is fixed by welding bottom plate and U-shaped plate, and is anchored with warehouse wall by preset hole and expansion bolt, then the back-shaped limiting plate is fixedly installed on I-beam seat by connecting bolt, then the warehouse roof plate is hoisted by using preset hoisting equipment, so that the fulcrum of warehouse roof plate falls in the limiting notch arranged in the middle of back-shaped limiting plate, the horizontal displacement of the fulcrum of warehouse roof plate is limited by using back-shaped limiting plate, the stability of warehouse roof plate is improved, and the setting of oval reinforcing rib and rib plate is used to enhance the strength of structure itself, so that it has more stable supporting property.

This utility model discloses a support system for an integrated sloping roof and courtyard, and a residential photovoltaic power station. The system includes a roof support and a courtyard support. The roof support comprises several horizontally spaced inclined beams on a first sloping roof, several horizontally spaced back braces on a second sloping roof, and short column support assemblies installed on both the first and second sloping roofs to support the inclined beams and back braces. The back braces are correspondingly positioned to the inclined beams, with their upward-sloping ends connected to the beams. The inclined beams extend downwards along the first sloping roof to above the courtyard. The courtyard support includes columns installed within the courtyard, with their upper ends connected to the inclined beams. A reinforcement structure is provided between the columns and the inclined beams, and / or between the columns themselves. The roof support and courtyard support can be designed as a single unit, forming a unified slope above the first sloping roof and courtyard for installing photovoltaic modules, increasing the number of photovoltaic modules installed and expanding the power generation area.

The utility model provides a kind of mechanical arm lateral suction subassembly, comprising: a support base;Positioning plate is set in the side of support base;A sliding base is slidably set on support base;A suction disc matrix is set in sliding base, the suction disc of suction disc matrix is oriented to the side of departing from positioning plate, several exhaust branch pipes connect the back side of suction disc matrix and communicate suction disc;A exhaust main pipe, exhaust main pipe is limited in positioning plate, one end of exhaust main pipe is communicated exhaust branch pipe respectively, other end is communicated a air extraction equipment;And several support arms, the first end of support arm is connected to support base, and second end extends to the side of departing from positioning plate, and support arm forms the support platform of support suction object bottom surface jointly;A abutting plate is connected to the second end of support arm.The utility model can be aimed at unloading stacked carton scene lateral gripping, support heavier load, support carton bottom in the process of carrying, prevent bottom box from falling.

The present application relates to a kind of chip glue removal device and glue removal method, its device includes sander, bottom plate, rotating platform and be used for clamping chip clamping linkage mechanism, sander is installed at the one end of the upper surface of bottom plate, rotating platform is slidably arranged at the other end of the upper surface of bottom plate, clamping linkage mechanism is arranged on rotating platform, and can rotate with rotating platform, and clamping linkage mechanism can slide with rotating platform on bottom plate, to approach or away from sander, sander can be polished to the glue of the edge of chip clamped on clamping linkage mechanism remains.By clamping linkage mechanism, chip can be clamped, and the polishing range of chip to sander is adjusted by the sliding of rotating platform to polish, the orientation of chip is adjusted by the rotation of rotating platform, so that the glue on the surface of chip can be removed conveniently by once clamping, simple structure, easy and safe to operate, greatly improve glue removal efficiency, avoid chip damage.

The utility model belongs to movable type support pier structure in the field of shipbuilding technology. The drive wheel (10) of first motor (9) of one side of support pier body (3) connects first track assembly (1), the drive wheel (10) of second motor (11) of the other side of support pier body (3) connects second track assembly (7), and the bottom of support pier body (1) is provided with lifting component (6), and the lifting rod (8) of bottom lifting component (6) is connected with the bottom of support pier body (3). The movable type support pier structure has simple structure, can satisfy reliable lifting support in the process of shipbuilding, can be automatically moved in short distance on site, saves manpower, saves time and is at ease, and improves shipbuilding efficiency.

The present application relates to a new energy power station voltage support capability quantitative evaluation method and device, the method comprises the following steps: determining the single machine voltage support capability evaluation index of grid-connected type new energy and grid-constructing type energy storage; taking the rated capacity of the new energy power station as the benchmark, combining the capacity proportion of different types of units in the power station, integrating the single machine voltage support capability evaluation index through normalization processing and parallel superposition principle, obtaining the overall voltage support capability evaluation index of the new energy power station; based on the overall voltage support capability evaluation index of the power station, combining the parameters of the step-up transformer and the equivalent impedance of the power grid, determining the voltage support capability evaluation index of the new energy power station at the grid connection point; based on the amplitude-frequency characteristic of the voltage support capability evaluation index of the new energy power station at the grid connection point, the voltage support capability of the new energy power station is quantitatively evaluated in the whole process. The present application can accurately depict the influence of equipment control dynamics on voltage support capability.

The utility model provides a headrest mechanism can be folded back to electric, including headrest assembly, screw rod drive mechanism, base, rotating shaft and fixed bolster, screw rod drive mechanism and fixed bolster all solid are established on the base, rotating shaft is rotatably connected on the fixed bolster, headrest assembly is fixed on the rotating shaft, screw rod drive mechanism is connected with rotating shaft through connecting rod mechanism, screw rod drive mechanism and connecting rod mechanism are rotatory connection, connecting rod mechanism and rotating shaft are fixed connection, connecting rod mechanism is rotatory connection still on the base, when screw rod drive mechanism drives connecting rod mechanism to move, can drive rotating shaft to rotate back, thereby drive headrest assembly to fold back, the utility model discloses can realize the big angle folding back of headrest assembly, whether the driver needs to adjust the headrest angle in the specific driving scene, or leans back and folds back, the headrest needs to fold back to the rear larger angle to realize the storage, and this structure can provide enough folding range, greatly enhanced the use convenience of headrest.

The application discloses a sound equipment suitable for a new energy vehicle-mounted system and relates to the technical field of vehicle-mounted sound equipment. The outer wall of the lifting frame is connected with a stabilizing frame used for promoting stable lifting of the playing frame. The lateral wall of the lifting bin is provided with a lifting sliding groove used for sliding connection with the outer wall of the stabilizing frame. The upper end of the stabilizing frame is connected with a fan-shaped outer frame. The inner ring of the fan-shaped outer frame is connected with a fan-shaped inner frame. The outer wall of the playing frame is slidingly connected with the inner wall of the lifting bin. The application has the advantages that the sound source position can be optimized synchronously with the position of the people in the vehicle and the driving and riding scene, sound field uniform coverage is ensured, the external sound pipe in the external sound hole can be flexibly stretched and contracted, the external sound pipe is stretched out to prolong the sound path when low-pitch focusing needs to be enhanced, the sound effect demand of the vehicle-mounted closed space is adapted, the outer cladding plate can quickly complete height locking and unlocking of the playing frame, the cladding locking structure of the outer cladding plate further strengthens the position stability of the playing frame, and sound effect distortion or component damage is prevented.

The utility model provides a portable quick assembly stringing device, its characterized in be connected with support pipe, two groups adjustable support mechanism, including: two groups adjustable support mechanism, connecting mechanism and support pipe, the adjustable support mechanism has lower support frame, and the inside one end of lower support frame is connected with the inclined support, and the one end of inclined support away from lower support frame is fixed with support cylinder, and the middle part rotation of inclined support is provided with connecting block, and the inside screw thread connection of connecting block has support adjusting screw rod, in the utility model, support pipe is inserted in the middle part of cable reel, and adjustable support mechanism supports its both ends, and two groups adjustable support mechanism are connected through connecting mechanism and support each other, and provide stable support for support pipe and the cable reel of outside sleeve of it, the split type design between adjustable support mechanism, connecting mechanism and support pipe, and single component is light in weight and small in size, and is convenient to store, remove and transport.

The utility model relates to outdoor articles technical field discloses a kind of multi-fuel portable conical outdoor cooking device, including double-layer conical plate one, the double-layer conical plate one includes double-layer conical plate two, the top inner wall of double-layer conical plate two is fixedly connected with two support rods one, the top of two the support rod one is fixedly connected with pot one, the top of pot one is fixedly connected with top cover one. Including single-layer conical plate, the top of single-layer conical plate is fixedly connected with two support rods two, the inside of double-layer conical plate one is provided with alcohol stove, and the inside of single-layer conical plate and double-layer conical plate is provided with alcohol stove. In the utility model, effectively handle the problem that outdoor cooking device exists in use cannot adapt to multiple fuels and combustion is unstable and fuel efficiency is low. The diversity of outdoor cooking experience is improved, and more universal cooking solution is provided for outdoor enthusiasts.

The utility model relates to the technical field of storage bag, disclose a kind of portable storage bag, including storage bag body, the inner side edge position of storage bag body is provided with first zipper, the inner side wall of storage bag body is provided with external closure layer, the inner side wall of storage bag body is fixedly connected with connecting layer, the inner side wall of storage bag body is fixedly connected with split layer, the outer surface of storage bag body is fixedly connected with support air bag column, the upper surface of storage bag body is fixedly connected with elastic air bag, the side of elastic air bag is provided with air inlet, the other side of elastic air bag is provided with check valve, the one end of check valve is fixedly connected with exhaust valve, the utility model is set to external closure layer, second zipper, connecting layer, third zipper and split layer, and by the setting of support air bag column, elastic air bag, air inlet, check valve and exhaust valve, effectively solve the problem that the internal article of existing storage bag is easy to be chaotic, and the structure is insufficiently supported.

The present application relates to the technical field of ceramic coating, especially to a micro-nano structure ceramic coating and its application on the reaction furnace of zircon sand boiling chlorination method, aiming at solving the problems of weak bonding force between the existing protective coating and the substrate, poor thermal shock resistance and easy failure in long-term high-temperature chlorine environment; the present application constructs a nano-wire reinforced micro-nano structure transition layer on the surface of porous corundum brick substrate in situ, and sequentially constructs a lanthanum phosphate bonding layer and a yttrium stabilized zirconium oxide barrier layer on the transition layer; the design utilizes the mechanical anchoring effect of micro-nano structure and the strong chemical bonding ability of lanthanum phosphate to realize the firm combination of the coating and the substrate; the dense characteristics of the zirconium oxide layer provide ultimate protection; the method significantly improves the overall anti-peeling ability and long-term corrosion resistance of the coating system.

This invention discloses an intelligent UAV patrol decision-making method based on image recognition and semantic analysis after a typhoon disaster. The method includes: acquiring multi-source post-typhoon data and preprocessing it to form multi-modal post-disaster basic data; performing semantic analysis on disaster reporting and repair text data to extract typhoon characteristic information, affected equipment information, and prone-to-fault information to generate prior disaster information; fusing and analyzing the prior disaster information with equipment operation data to determine the suspected damage status of each piece of equipment or section to be inspected and key inspection targets; generating UAV patrol routes by combining equipment ledger data, meteorological data, and UAV operation constraints; controlling the UAV to collect target images and performing image enhancement and image recognition to obtain equipment damage identification results; generating post-disaster patrol decision results based on the identification results and transmitting them back to the repair command platform. This invention can improve the accuracy of post-disaster patrol target selection, the robustness of image recognition, and the efficiency of repair resource allocation.

The utility model discloses a kind of bracket structures for new energy circuit board production, belong to new energy technical field, comprising: bracket main body and the fixed base below bracket main body;The bracket main body includes two groups of L-shaped frame and support plate, the support plate is located between two groups of L-shaped frame and is hinged to each other, the bottom of the L-shaped frame is slidably arranged at the top of fixed base, the utility model is designed to the bracket main body structure, when the support plate is moved upward, the L-shaped frame of both sides will be deflected downward relative to support plate, the both ends of circuit board are released from rubber buckle, conveniently unload circuit board, while limiting buckle is folded in cooperation with the middle of adjusting assembly, conveniently the circuit board of different size is clamped and positioned, cooperate rubber buckle and stabilize circuit board on the top of bracket main body, device structure is simple, flexible and changeable simultaneously, applicable to most different size circuit board processing use.

This invention provides an operating device for welding the upper chord members of a hollow ball net frame. Installed on the diagonal web members of the net frame, it includes a support component, scaffolding boards, and a safety rope. The support component comprises multiple hook-type suspension members made of threaded steel, with both ends bent in the same direction to form a hook structure. The hook-type suspension members are initially placed on the chord members and slide along them under gravity and pressure, entering the intersection area between the chord member and the ball joint, where they are constrained by the geometry of this area, achieving stable support. The scaffolding boards are installed on the support component and include at least two parallel planks. One end of the safety rope is connected to the worker's safety belt, and the other end is fixed to a transverse chord member of the ball net frame. This invention is easy to install, structurally stable, and improves the safety and construction efficiency of high-altitude operations on ball net frames.

The utility model discloses a kind of energy storage power station temperature monitoring systems, it is related to temperature monitoring system field.The energy storage power station temperature monitoring system, including temperature sensor module, data acquisition and transmission module, monitoring and alarm module, monitoring interface and database, audible and visual alarm and cooling system execution module, the cooling system execution module is used to cool energy storage power station, the energy storage power station temperature monitoring system, the structure of first clamping unit and second clamping unit is set on the liquid cooling plate in cooling system execution module, first clamping unit is convenient to limit the both ends of cooling pipeline, second clamping unit is convenient to support and limit the bending of cooling pipeline, first clamping unit and second clamping unit cooperate and facilitate adjusting the spacing between cooling pipeline on liquid cooling plate, and the distance between cooling pipe can reach suitable cooling effect according to the different device of heating.