38 results about "Heat tolerance" patented technology

The utility model discloses a sealing ring with high toughness, which comprises a sealing ring main body, the sealing ring main body comprises a base layer, the outer side of the base layer is provided with a high-temperature-resistant layer, the outer side of the high-temperature-resistant layer is provided with a wear-resistant layer, and a plurality of uniformly distributed connecting blocks are embedded in the sealing ring main body. The sealing ring has good heat resistance and cold resistance, so that the sealing ring can be used in an extreme environment, the service life is prolonged, the wear-resistant layer is made of chloroprene rubber, the wear-resistant layer is located on the surface layer, the oil resistance is extremely good, the wear resistance is high, the heat resistance is good, the bonding force is high, the wear resistance of the sealing ring is effectively improved, and the service life of the sealing ring is prolonged. And the multiple connecting pieces are connected end to end through the connecting blocks to form a polygonal structure, the traction effect is achieved, the connecting pieces have the characteristic of high toughness, and the toughness and the deformation resistance of the sealing ring body can be enhanced.

The present application relates to a kind of hollow small ball heat resistance visualization evaluation method based on high temperature microscope technique.First, temperature calibration is carried out to high temperature metallographic microscope, second, 1-10mg hollow small ball is evenly sprinkled on glass slide using medicine spoon, and the glass slide is vibrated, so that the hollow small ball on it is single layer distribution, not mutually overlapping, shielding, in 600-1000 ℃ temperature interval, at least three grades of temperature increasing rate is used to heat, and the state of hollow small ball under each temperature increasing rate is recorded in real time using video image.Subsequently, according to the state continuous change spectrum of microsphere in heating process, the temperature T m1 、 m2 、 m3 of 50±5% proportion of hollow small ball in a certain field of view is determined, which softens and collapses.Finally, the softening temperature T m1 、 m2 、 m3 of hollow small ball under at least three grades of temperature increasing rate is linearly fitted, and the softening temperature T m of hollow small ball at heating speed of 0 ℃ / min, i.e., constant temperature, is obtained, which is the heat resistance characteristic temperature in equilibrium state.

The utility model discloses a hot induced draft fan with high stability, which belongs to the technical field of induced draft fans and comprises a casing mechanism and a filter mechanism, an induced draft mechanism for providing power and conveying air is mounted on the casing mechanism, a connecting cover mechanism for connecting components is further mounted on the casing mechanism, and the filter mechanism is mounted on the casing mechanism. And a reverse blowing mechanism is mounted on the connecting cover mechanism. According to the utility model, through the arrangement of the casing mechanism and the air inducing mechanism and the application of temperature-resistant materials and heat-insulating materials, the heat resistance of each part of the device is improved, heat can be effectively prevented from being conducted to the motor, and the heat resistance of the device is further improved; through the arrangement of the connecting cover mechanism, the back flushing mechanism and the filtering mechanism, the filtering mechanism can effectively filter dust in gas, so that the stability of the device is improved, and the filtering mechanism can be conveniently cleaned through the back flushing mechanism when the filtering mechanism is saturated.

The invention discloses a spraying type polyurethane heat-preservation, waterproof and heat-insulation integrated material and a preparation method thereof, relates to the technical field of heat-preservation, waterproof and heat-insulation materials, and aims to solve the technical problem that the current polyurethane spraying heat-preservation, waterproof and heat-insulation integrated material is poor in use performance in a northern low-temperature environment. A polyurethane material formed by the component B is located on the inner side and has good thermal insulation performance, good flexibility can still be kept in a low-temperature environment, the thermal insulation performance cannot be reduced due to too low temperature, a polyurethane material formed by the component C is located on the outer side and has good hydrophobicity and moisture resistance, and the thermal insulation performance is good. Compared with the prior art, the material has the advantages that adsorption and permeation of snow water can be effectively prevented, heat resistance, cold resistance and weather resistance are improved, stable performance can be kept under different temperature conditions, and the material is not prone to being affected by severe cold weather when used on building outer walls under the severe cold environment in the north.

The invention discloses a load resistor device. The load resistor device comprises an insulating bracket and a resistor rope, the insulating bracket comprises two panels which are arranged side by side at an interval; a plurality of rope penetrating holes through which the resistance rope can penetrate are formed in the panels; the resistance rope penetrates through the panel rope penetrating hole back and forth, the resistance rope comprises a heat-resisting main rope and a resistance wire, and the resistance wire is spirally wound on the heat-resisting main rope. When the load resistance box works, the resistance rope penetrates through the panel back and forth, heat is generated when the resistance rope works, the heat-resistant main rope is arranged to be of a main body structure, and the heat-resistant main rope can keep stable in size when the load resistance box works and is small in size change due to expansion caused by heat and contraction caused by cold by utilizing the heat-resistant performance of the heat-resistant main rope; after long-time use, good dimensional stability can be maintained, and short circuit between the resistance wires on the adjacent resistance ropes is avoided.

To achieve construction of existing piping for a hot water supply facility in consideration of heat resistance and followability to thermal contraction according to characteristics of paint used for the piping and lining.SOLUTION: The method includes a step of drying the inside of the existing hot water supply pipe 2 after cleaning the inside of the existing hot water supply pipe 2, a step of polishing the inside of the existing hot water supply pipe 2 by injecting an abrasive with dry compressed air while advancing the inside of the existing hot water supply pipe 2 from both ends to a target position, and a step of coating the inside of the existing hot water supply pipe 2 by injecting a paint having a predetermined viscosity with compressed air while advancing the inside of the existing hot water supply pipe 2 from both ends to the target position. As the lining material to be applied to the inside of the existing hot water supply piping 2 in this construction method, a material obtained by blending a main material containing an epoxy resin as a main component and a curing agent containing a modified alicyclic polyamine as a main component at a weight ratio of 100:50 is used.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of oven for coating heat resistance detection, especially oven for coating heat resistance detection, including fixed base plate, fixed base plate is provided with connecting mechanism, connecting mechanism contains setting in fixed base plate rear section setting has traction assembly, fixed base plate top is provided with main part assembly, fixed base plate right section is provided with detection assembly. Threaded adjusting rod and slide bar cooperate with the spray head, the spraying height and position can be adjusted flexibly, combined with the movement of the sliding box body, realize uniform coating spraying; the air compressor, the eddy current pipe and the hot air spray head in the main part assembly cooperate with each other, can stable output hot air, accurate simulation high temperature detection environment; the connecting base plate and the threaded rod cooperate with the fixed sliding box body, ensure that each component is stable in position when working; these designs effectively solve the problems of uneven heating of traditional oven test piece, uneven coating spraying and the like, greatly improve the accuracy and reliability of coating heat resistance performance detection result.

The frying and baking machine comprises a shell and a baking tray, a metal tray is arranged between the shell and the baking tray, a heating piece used for heating the baking tray is arranged on the metal tray, and the shell is provided with a surrounding wall; the metal disc comprises a bottom wall, a side wall connected with the bottom wall, an outer flange connected with the side wall and folded outwards, and a bent part connected with the outer flange and bent relative to the outer flange, the lower end of the bent part is in butt joint with the upper end of the enclosure wall, and a heat insulation space is formed among the upper portion of the side wall, the outer flange, the bent part and the top of the enclosure wall. The existence of the heat insulation space can reduce the heat transfer from the metal disc to the enclosure bulkhead of the shell, reduce the temperature rise of the shell, reduce the requirement on the heat resistance of the shell from the perspective of materials, and further reduce the cost of manufacturing the shell.

The invention relates to the technical field of household appliances, and discloses a heating assembly and a household appliance, and the heating assembly comprises a heating body which comprises at least one heating sheet, and the heating sheet is of an annular structure or a polygonal frame structure; the heat dissipation structure comprises a plurality of heat dissipation sheets which are in heat conduction connection with the heating sheet, and the heat dissipation sheets are uniformly distributed along the circumferential direction of the heating sheet; and the bracket supports the heat dissipation structure. According to the support supporting heat dissipation structure, the support does not make contact with the heating piece, local fusion or creep deformation of the support caused by the fact that high temperature of the heating piece is directly transmitted to the support can be prevented, and excursion or unstable supporting of the heating assembly caused by deformation of the support is avoided. As the bracket is not in contact with the heating sheet, the bracket can be made of a material with relatively low heat resistance, so that the bracket is convenient to form, and the material cost can be reduced.

The invention is suitable for the field of automobile part testing, and provides an automobile headlamp front tile heat resistance testing device, which comprises a pressure-resistant box and a pressure-resistant cover plate, the edges of the pressure-resistant box and the pressure-resistant cover plate are connected through a hinge, and the pressure-resistant box and the pressure-resistant cover plate are in airtight connection; a pressure sensor and a temperature sensor are arranged in the pressure-resistant box, and the pressure-resistant box is filled with water. During use, after the interior of the pressure-resistant box is filled with water, the pressure-resistant cover plate is assembled, so that the pressure-resistant box and the pressure-resistant cover plate form a closed state, the water in the pressure-resistant box can be heated to over 100 DEG C, and a material workpiece can be heated in the water; compared with a drying mode, the heating mode has higher stability, the specific heat capacity of water liquid is larger than that of air, then the temperature of the material workpiece cannot be suddenly changed in the hot water environment, the pressure mechanism continuously applies pressure to the material workpiece, and a worker can collect the deformation conditions of the material workpiece at different temperatures.

The invention belongs to the technical field of high-temperature heat storage, and relates to a multi-layer composite high-temperature fused salt storage tank. The closed tank body is formed between the tank top and the tank body and used for storing high-temperature fused salt, the fused salt can be effectively prevented from making contact with the external environment, heat loss is reduced, and the heat energy storage efficiency is improved. The inner heat-resistant concrete layer is in direct contact with high-temperature molten salt, and the outer layer structure is protected against damage. The fire-resistant insulating brick layer can prevent heat from being transferred outwards, and the heat energy storage efficiency is improved. The outer heat-resistant concrete layer further enhances the heat resistance and the overall strength of the storage tank and corresponds to the inner heat-resistant concrete layer to form a closed heat-resistant protection system. The structural layer is a main bearing layer for molten salt pressure in the storage tank, and the mechanical property stability of the structural layer can be guaranteed. The heat storage device can meet the energy storage requirements of different working temperatures and molten salt media, the heat loss is reduced through the multi-layer composite structure, the heat energy storage efficiency is improved, and the energy consumption and the operation cost are reduced.

The invention discloses a heat-resistant long-life conveying belt capable of preventing material adhesion, which belongs to the field of material conveying equipment, and comprises a rack, a conveying assembly, a cooling assembly, a power assembly, an anti-static assembly and a walking unit, universal wheels with brakes are arranged at the lower end of the rack; the conveying assembly comprises a multi-layer structure conveying belt and a detachable dust cover. The cooling assembly reduces the temperature of the conveying belt through a closed loop; the power assembly is driven by a variable frequency motor and a synchronous belt. The anti-static assembly is provided with a plasma fan and a grounding brush for dual protection. The heat-resistant long-service-life conveying belt capable of preventing material adhesion is high in heat resistance, long in service life, capable of reducing material adhesion and electrostatic hidden dangers, capable of being flexibly moved and adjusted, convenient and fast to maintain, suitable for high-temperature material conveying scenes such as chemical engineering and metallurgy, and low in comprehensive use cost.

The utility model discloses far infrared light blowing equipment, and belongs to the field of hair dryer design. According to the far infrared light blowing equipment, the health care and health preserving effects of the blower are improved by combining the high-wind-speed blower and the far infrared light technology. Firstly, the far infrared light technology improves the hair care effect through the thermal radiation effect. Furthermore, through the optimized design of the far-infrared ceramic mica coil, the far-infrared light emissivity up to 90% or above is ensured. The efficient far infrared radiation can provide uniform heat distribution in the blowing process, the blowing temperature is stabilized, and local overheating is avoided. In order to solve the problem that an existing ceramic material is prone to damage, according to the scheme, the far infrared ceramic mica ring is fixed in the air outlet, and the durability and the stability are improved by adopting the design of a mica sheet composite material. The mica sheet has good thermal stability and insulation characteristics, so that the heat resistance and anti-stripping capability of the ceramic material can be improved. The mica sheet is added into the ceramic material, so that the structural stability of the ceramic material can be enhanced, and the fracture risk under high temperature and long-term use is reduced.

The utility model relates to the technical field of medical instruments, and provides a steam conveying structure and a steam ablation device. The utility model provides a steam conveying structure which comprises a steam guide pipe and a reinforcing assembly. The steam catheter can be used for conveying steam for ablation; the reinforcing assembly is arranged on the side wall of the steam guide pipe. During specific implementation, the problem that in the prior art, a steam guide pipe is prone to thermal expansion deformation when conveying high-temperature steam is solved by introducing the reinforcing assembly. The reinforcing assembly is particularly arranged on the side wall of the steam guide pipe, and the design aims at enhancing the structural stability and heat resistance of the steam guide pipe, so that the thermal expansion effect generated by high-temperature water vapor is effectively resisted. Through supporting of the reinforcing assembly, the stability of the shape and the size of the steam catheter can be kept, deformation caused by thermal expansion is avoided, the conveying effect of water vapor and the treatment accuracy are ensured, and the reliability and the safety of the hot steam ablation technology are improved.

The present application relates to an exhaust manifold, comprising an exhaust manifold body, a barrier layer and a heat-resistant layer. The barrier layer is provided on the outer wall of the exhaust manifold body, and the heat-resistant layer is provided on the inner wall of the exhaust manifold body. The barrier layer is used to block the heat exchange between the inside and outside of the exhaust manifold body, and the heat-resistant layer is made of a heat-resistant material. By means of the barrier layer to block the heat exchange between the inside and outside of the exhaust manifold, the heat loss caused by the heat in the exhaust manifold diffusing outward can be reduced, and the wiring harness, sensors and other pipes near the exhaust manifold can be protected. Moreover, the barrier layer can replace the exhaust manifold heat shield, saving the installation space and cost of installing the heat shield. The inner side of the exhaust manifold body has the highest working temperature and the most complex working environment. By providing a heat-resistant layer on the inner wall of the exhaust manifold body, the heat resistance of the exhaust manifold can be improved with the help of the heat-resistant layer, so that it can work in harsh working environments and the service life of the exhaust manifold can be increased.

The utility model discloses a cold-resistant and heat-resistant dual-function pressure gauge, which relates to the technical field of cold-resistant and heat-resistant dual-function pressure gauges and comprises a pressure gauge protective casing, when the pressure gauge is used, a liquid guide pipe jacket can be rotated firstly and then taken down from a liquid guide pipe, and then heat insulation materials such as glass foam coating are placed into a heat insulation material filling cavity through the liquid guide pipe. The glass foam coating is a low-density coating material and can form an efficient heat isolation layer, so that heat transfer can be effectively reduced, a heat insulation effect can be achieved on the pressure gauge protection shell, and the heat resistance of the pressure gauge protection shell can be improved; and then the liquid guide pipe outer sleeve is reset, then the telescopic inner rod clamping block is pressed, then the telescopic inner rod is moved towards one side of the telescopic outer rod till the telescopic inner rod completely moves into the telescopic outer rod, and then the cold-proof material filling cavity cover plate is taken down.

The utility model discloses a flame-retardant high-temperature-resistant insulating tape which comprises a base layer, a first insulating layer is arranged at the top of the base layer, a reinforcing layer is arranged at the top of the first insulating layer, a second insulating layer is arranged at the top of the reinforcing layer, and a heat-insulating flame-retardant layer is arranged at the top of the second insulating layer. A fireproof layer is arranged at the top of the heat-insulating flame-retardant layer, and an anti-corrosion layer is arranged at the top of the fireproof layer; through the design of the heat-insulating flame-retardant layer, the fireproof layer and the anti-corrosion layer, the heat resistance and the flame retardance of the insulated rubber tape can be improved through the fireproof layer and the heat-insulating flame-retardant layer, the service life of the insulated rubber tape used in a high-temperature environment can be prolonged, the heat-insulating flame-retardant layer has corrosion resistance, and the corrosion resistance of the insulated rubber tape can be improved through the heat-insulating flame-retardant layer and the anti-corrosion layer; and the service life of the corrosion-resistant coating in a corrosion environment can be prolonged when the corrosion-resistant coating is used in the corrosion environment.

The invention discloses a heat-resistant solid wood floor and a preparation method thereof. The preparation method comprises the following steps: pretreating raw materials, preparing a base material layer, preparing a stress layer, performing primary compounding, preparing a heat-resistant core layer, performing secondary compounding, treating a heat-resistant protective layer, performing constant-temperature and constant-humidity balance treatment, and detecting and packaging. The rubber has the advantages of being better in heat resistance and more stable to use.

The utility model relates to the field of moxibustion, in particular to an anti-extinguishing and anti-scalding moxibustion box temperature controller. The technical problems that in the moxibustion process, due to the fact that burning moxa sticks are supported through an inner support, time and labor are consumed when clinical nurses conduct moxibustion or thunder-fire moxibustion on patients, meanwhile, in the using process, the tolerance of each person to moxibustion heat is different, and the moxibustion box cannot be adjusted according to different persons are solved. According to the technical scheme, the anti-extinguishing and anti-scalding moxibustion box temperature controller comprises a moxibustion box; the moxibustion box further comprises a moxibustion assembly, a sliding assembly, a box cover and a handle. According to the moxibustion box, the sliding blocks on the two sides slide in the sliding grooves, the upper box body and the temperature controller slide out of the moxibustion box, ignited moxa sticks are placed on the upper box body through the moxa inlet, moxibustion treatment is carried out on a patient, air circulation between the upper box body and the lower box body is kept through the arrangement of the smoke exhaust opening and the smoke exhaust holes, the moxa sticks are prevented from being extinguished in the treatment process, and the moxibustion box is safe and reliable. The moxibustion effect is influenced.

The invention relates to the technical field of ABS modification, and discloses a preparation method of a high-heat-resistance flame-retardant ABS plastic raw material, which comprises the following steps: S1, proportioning; s2, primary mixing; s3, internal mixing; s4, performing granulation; the invention also discloses the high-heat-resistance flame-retardant ABS plastic raw material prepared by the preparation method. The volcanic lime and the heat-resistant modifier are added into the ABS formula, so that the crystallization strength among ABS molecular chains can be effectively improved, the damage of heat to the ABS molecular chains is reduced, and the thermal deformation temperature and the heat resistance of the ABS material are further improved; by applying a pulsed magnetic field to the mixed material when the lubricant is added, the modification efficiency of the whole ABS raw material is improved, and meanwhile, the flame retardance and heat resistance of the ABS are further improved.

[Problem] To provide a mechanism capable of further improving the maintainability of an inhalation device. [Solution] This aerosol generation system comprises: an accommodation part that is capable of accommodating a base material including an aerosol source; and a heating part that is provided in the internal space of the accommodation part so as to protrude from the bottom of the accommodation part, and that is inserted inside the base material accommodated in the accommodation part. The surface of the heating part has applied thereon a first coating that is resistant to heat of 400°C or more and that has an oil contact angle of 25° or more. The inner surface of the accommodation part has applied thereon a second coating that is resistant to heat of 200°C or more and that has at least one characteristic of having an arithmetic average roughness of 2 μm or less or a water contact angle of 93° or more.

According to the layered gradient multifunctional sheath and the additive manufacturing method thereof, a gradient material structure is prepared by adopting an FDM technology, and the layered gradient multifunctional sheath sequentially comprises a weather-proof protective outer layer (ASA), a gradient transition middle layer (ASA-CF) and a structural function inner layer (PPA-CF) from outside to inside. According to the invention, excellent weather resistance and UV resistance of ASA and excellent mechanical strength and heat resistance of PPA-CF are organically combined by using an FDM technology, the integrated performance of external weather and internal strength is realized, gradient change of sheath materials is realized, and the total thickness of the sheath and the thickness ratio of each layer can be flexibly adjusted according to the specific installation position and borne environmental stress, so that the sheath can be widely applied to the field of high-voltage power cables. The high-weather-resistance and high-reliability high-weather-resistance and high-temperature-difference-resistance high-weather-resistance high-weather-resistance high-weather-resistance high-reliability high-weather-resistance high-weather-resistance high-weather-resistance high-weather-resistance high-reliability high-weather-resistance high-weather-resistance high-reliability high-weather-resistance high-weather-resistance high-reliability high-weather-resistance high-weather-resistance high-reliability high-weather-resistance high-reliability high-weather-resistance high-reliability high-weather-resistance high-reliability

The invention belongs to the technical field of training management systems, and particularly relates to an intelligent training management system based on a heat tolerance screening scale, which comprises a user portrait module, a task planning module, a result evaluation module and a result evaluation module. The method is more scientific and flexible; meanwhile, individual differences are recognized, and training tasks are scientifically formulated; the probability of occurrence of a lethal disease, namely heat stroke, is greatly reduced while the training effect and military task completion are ensured to the maximum extent; through a user portrait module, a personalized personal information file is established, and personal thermal endurance data is collected, so that when a commander needs to engage in strong physical activities in a high-temperature environment, the commander can reasonably assign operators and formulate operation tasks according to thermal endurance data conditions in the personal information file in combination with actual high-temperature environment conditions; the working efficiency is improved, and the risk of heat tolerance diseases is reduced.

The application discloses a low-haze heat-resistant BOPE film and a preparation method and application thereof, and belongs to the technical field of film preparation. Through optimization of material ratio and precise control of production process parameters, the application reduces the haze and the heat shrinkage rate at the same time, so that the prepared BOPE film has both low haze and heat resistance, and the requirements for the low haze and heat resistance of the BOPE film in the printing and bag making processes are solved.

The utility model discloses a fireproof door with a smoke-proof structure, which comprises a door frame, a fireproof door main body is hinged to the left side in the door frame through hinges, and an automatic door closer is arranged between the top of the fireproof door main body and the top of the door frame. According to the fireproof door, the first L-shaped high-temperature-resistant sealing strip and the second L-shaped high-temperature-resistant sealing strip are mutually embedded, pressure is applied to the back face of the second L-shaped sealing strip through the jacking mechanism, the sealing effect is improved, when a fire occurs, the temperature around the fireproof door rises, the thermal fuse is fused when heated, and the bottom high-temperature-resistant sealing gasket makes contact with the ground, so that the fireproof door is prevented from being damaged. And the gap between the bottom of the fireproof door main body and the ground is sealed, so that the surrounding gaps of the fireproof door plate are effectively sealed, fire smoke and dust are prevented from flowing out of the gaps, the heat resistance and the smoke prevention effect of the fireproof door are improved, and damage can be effectively reduced when the fireproof door encounters a fire.

The utility model relates to the technical field of atomization structures, and provides a liquid guide part, an atomization core and an aerosol generating device. The liquid guide part comprises a heat-resistant layer, a protective layer and a liquid guide layer; the heat-resistant layer is attached to the heating mesh, and the protective layer is attached to the inner wall of the fixed cylinder; the liquid guide layer is located between the heat-resistant layer and the protective layer. The liquid guide piece is installed in the atomizing core for use, the atomizing core generally further comprises a fixing cylinder and a heating mesh, and the liquid guide piece is located between the fixing cylinder and the heating mesh. The heat resistance of the heat-resistant layer is better, the protective layer is used for protecting the liquid guide piece, the reliability is good, and the liquid guide performance of the liquid guide layer is better. The liquid guide piece is formed by combining different functional layer structures, so that the liquid guide piece has both heat resistance and reliability and has good adsorbability to aerosol generating media, the liquid guide piece is prevented from generating peculiar smells in the high-temperature heating process of the heating mesh when the atomizing core is used, the use taste of a user is guaranteed, and the user experience is improved. And the liquid guide piece is prevented from being damaged when being installed in the fixed cylinder.

The utility model relates to the technical field of cables, and discloses a novel fireproof cable which comprises a cable body. According to the utility model, the cable body, the mica fireproof layer, the ceramic insulating layer, the internal armor layer and the external armor layer are arranged, the cable is made of a low-smoke halogen-free material, flame spreading can be prevented to a certain extent, fire hazards can be reduced, and the ceramic insulating layer can improve the insulating performance and heat resistance of the cable, so that the cable is more environment-friendly. The mica fireproof layer utilizes the excellent characteristics of a mica material, such as high temperature resistance and fireproof performance, to realize fireproof protection of the cable or other protected objects. When high-temperature flames occur, the mica fireproof layer expands rapidly and releases moisture to form a protection layer, so that the surface of a protected object is not easy to burn, the fireproof effect is achieved, the inner armor layer and the outer armor layer enable the cable to be a firmer, wear-resistant and extrusion-resistant outer layer material, the cable is protected against external physical damage, and the fire risk is reduced.

The utility model relates to the technical field of sealing rings, and discloses a high-temperature resistant rubber sealing ring, comprising a supporting ring and a sealing ring, wherein a card slot is arranged on the outer wall of the supporting ring, the number of the card slots is two, the number of the sealing rings is equal to the number of the card slots, the two sealing rings are respectively sleeved in the two card slots, an air slot is arranged inside the sealing ring, and the air slot is filled with heated gas; the supporting ring in the utility model supports the sealing ring, the outer wall of the sealing ring contacts the inner wall of a mechanism to be sealed for sealing, under a high-temperature environment, the elasticity of the sealing ring is reduced, the heated gas in the air slot is heated, and then the sealing ring expands outward from the inside of the air slot, and then the outer ring of the sealing ring keeps in contact with the inner wall of the mechanism to be sealed, thereby maintaining the sealing effect, and improving the practicability and heat resistance.

The utility model discloses a thermal stress test device for a circuit board, which comprises a test box and is characterized in that a heating mechanism is matched with two groups of refrigerators to provide a high-temperature environment, a low-temperature environment and a rapid temperature change environment for the circuit board in the test box so as to simulate the thermal stress condition of the circuit board in actual use. The temperature sensor and the pressure sensor monitor the temperature and the pressure in the test box respectively, the pressure sensor measures thermal stress generated by the circuit board in the temperature change process in real time and transmits data to the control panel to be analyzed and processed, and a driving motor in the moving mechanism drives a threaded rod to rotate, so that the circuit board is driven to move. The sliding block in threaded connection with the outer wall of the threaded rod linearly moves under the limitation of the limiting rod, so that the position of the circuit board is adjusted when the circuit board in the tray is tested, uniform thermal stress can be ensured in the test process, the heat resistance and the reliability of the circuit board can be evaluated more accurately, errors are reduced, and the test efficiency is improved. And the test accuracy is improved.