104results about How to "No fatigue damage" patented technology

The invention discloses a magnetorheological energy absorber with failure-safety performance. The magnetorheological energy absorber with the failure-safety performance is characterized in that an inner cylinder body and an outer cylinder body form a sleeve barrel structure with two sealed ends, a piston is arranged inside the inner cylinder body, a hollow cavity of the inner cavity body is an inner cavity, an annular outer cavity is formed between the inner cylinder body and the outer cylinder body, the piston divides the inner cavity into a front cavity and a rear cavity, the lateral walls, located at the front end and the rear end of the inner cavity, of the front cavity and the rear cavity are respectively provided with a liquid flowing hole, the inner cavity and the outer cavity are communicated through the liquid flowing holes, magnetorheological liquid fills the inner cavity and the outer cavity, an annular groove is formed in the outer lateral wall of the inner cylinder body and / or the inner lateral wall of the outer cylinder body, electromagnetic coils and permanent magnets are arranged inside the annular groove, and a magnetic field produced by the permanent magnets and the electromagnetic coils is cut by two sides of the inner cylinder body and the two sides of the groove to effectively surround the outer cavity and the outer cylinder body, so that a closed magnetic flow loop is formed. The magnetorheological energy absorber and a semi-active control system of the magnetorheological energy absorber provide the reliable failure-safety performance and effectively widen application occasions.

The invention relates to an inorganic thermal insulation and decoration mortar, which is characterized by comprising the following components in parts by weight: 180-220 parts of cement, 40-60 parts of flyash, 560-600 parts of sand, 50-70 parts of heavy calcium carbonate powder, 70-100 parts of inorganic lightweight aggregate, 3-9 parts of bentonite, 4-8 parts of wood fiber, 2-7 parts of moisture repellent, 2-5 parts of saltpetering inhibitor, 0.5-4 parts of cellulose ether, 6-15 parts of rubber powder and 1-30 parts of pigment. The preparation method is implemented as follows: evenly mixing the cement, flyash, sand, heavy calcium carbonate powder, bentonite, wood fiber, moisture repellent, saltpetering inhibitor, cellulose ether, rubber powder and pigment, adding the inorganic lightweight aggregate, and carrying out mechanical mixing uniformity to obtain the product in the invention. The mortar in the invention has the advantages of thermal insulation, strong hydrophobicity, fire resistance, environment protection, no pollution, same duration with buildings and the like.

The invention discloses a quick and automatic assembling device for the sealing ring of a valve element housing. The quick and automatic assembling device comprises a machine frame, a sealing ring material supplying module, a valve body material supplying module, a valve body material moving module and a sealing ring assembling module, wherein the valve body material moving module and the sealing ring assembling module are arranged on the machine frame, and the sealing ring material supplying module and the valve body material supplying module are arranged on one side of the machine frame; the sealing ring material supplying module is used for achieving automatic and ordered loading of the sealing ring; the valve body material supplying module is used for achieving automatic and ordered loading of a valve body; the valve body material moving module is used for sending a to-be-assembled valve body to an assembling work station, and positioning the to-be-assembled valve body to achieve ring sleeving in an assisting way; and the sealing ring assembling module integrates actions of ring supporting, sleeving and stripping into a whole. The quick and automatic assembling device integrates actions of ring supporting, sleeving and stripping in one mechanism for accomplishment, has the characteristics of simple and compact structure, ingenious implementation way, reliable running, zero fatigue damage to the sealing ring, and the like, and greatly improves the assembling efficiency.

The invention discloses a microwave induction control method and a microwave induction control device and relates to the technical field of application of microwave sensors. According to the method, an action system for judging whether persons enter or leave the scene or not is established by using the Doppler effect through the microwave induction control device; a switch of a power supply of an electrical appliance is controlled by identifying the action that human bodies enter or leave the scene; the microwave induction control device adopted by the method can be arranged inside the electrical appliance, so that the electrical appliance adopts a closed structure, and moisture resistance and electric shock prevention can be realized. In addition, according to the method, the action whether the human bodies leave or not can be identified, and the power supply of the electrical appliance is automatically closed when the human bodies leave the detection range and no person exist in the detection range. Besides, the device is low in power consumption; when the device is installed on the electrical appliance for use, the standby power consumption of the electrical appliance can be greatly reduced, and further the aims of saving energy and electricity are achieved.

The invention relates to heat-preserving decorative mortar which comprises the following components in parts by weight: 180-220 parts of cement, 30-70 parts of fly ash, 560-600 parts of sand, 70-100 parts of heavy calcium carbonate, 30-60 parts of heat-preserving aggregate, 3-9 parts of bentonite, 4-8 parts of wood fiber, 2-7 parts of water repellent, 2-5 parts of alkalization inhibitor, 0.5-4 parts of cellulose ether, 6-15 parts of rubber powder and 1-30 parts of pigment. A preparation method thereof comprises the following steps of: firstly uniformly mixing the cement, the fly ash, the sand, the heavy calcium carbonate, the bentonite, the wood fiber, the water repellent, the alkalization inhibitor, the cellulose ether, the rubber powder and the pigment, subsequently adding the heat-preserving aggregate, and then mechanically and uniformly mixing to prepare the heat-preserving decorative mortar. The invention has the advantages of heat preservation, heat insulation, strong hydrophobic property, environmental protection, no pollution, and the like.

The invention discloses an all-shearing type magneto-rheological damper. The all-shearing type magneto-rheological damper is characterized by comprising an outer cylinder, an inner cylinder and a ball screw pair, wherein the inner cylinder is coaxially arranged with the outer cylinder, shearing discs are fixed by the ball screw pair, the inner wall of the inner cylinder is provided with electromagnetic coils and sharing ring sets corresponding to the shearing discs one by one, magneto-rheological liquid is filled in a cavity of the inner cylinder, at least one electromagnetic coil is arranged between adjacent shearing rings fixed on the inner wall of the inner cylinder, and the shearing discs, the shearing rings and the inner cylinder form a closed flux loop. On the premise of keeping same external size and energy consumption of a magneto-rheological damper, null-field viscous damping of the magneto-rheological damper is reduced, controllable damping ratio range is enlarged, and the all-shearing type magneto-rheological damper is added with potential for application to a high-speed impact / vibration control system. Besides, service efficiency of the magneto-rheological liquid in the magneto-rheological damper is improved, and cost of the magneto-rheological damper is effectively reduced.

The invention discloses a clothes hanger station arriving and leaving conveying system, and solves the problems that a conveying chain in the conventional flexible clothes hanger station arriving and leaving conveying system has a complex structure and is inconvenient to produce and assemble and low in using stability. The technical scheme is that: the clothes hanger station arriving and leaving conveying system comprises a station arriving guide rail, a station leaving guide rail, a conveying chain and a plurality of driving wheels, wherein the conveying chain is lapped with the driving wheels and comprises a plurality of chain plates. The system is characterized in that: the head of each chain plate is hinged with the tail of an adjacent chain plate; a hinge point of each chain plate inclines to the inner side of the conveying chain; the head of each chain plate is provided with a hook interface on the outer side of the hinge point on each chain plate; the conveying chain is provided with a descending part for driving a clothes hanger to descend and an ascending part for driving the clothes hanger to ascend; hook interfaces on the descending part and the ascending part on the conveying chain are in a closed state; hook interfaces on the conveying chain, which are positioned at the driving wheels, are in an open state; and the station arriving guide rail and the station leaving guide rail are close to one driving wheel respectively.

The invention discloses an energy feedback type self-sensing magnetorheological damper. The energy feedback type self-sensing magnetorheological damper is characterized by comprising a pure shearing type magnetorheological damper body, an energy feedback mechanism used for converting mechanical energy into electric energy, and a rotating speed sensor, the pure shearing type magnetorheological damper body converts linear movement of a linear magnetorheological damper piston rod into rotational movement by means of a ball screw pair mechanism, the shearing mode which is one of the working modes of magnetorheological liquid is effectively utilized, and stepless damping force controllability of the magnetorheological damper is achieved by arranging a shearing disc, a shearing ring and a corresponding electromagnetic coil. According to the energy feedback type self-sensing magnetorheological damper, by means of the shearing mode of the magnetorheological liquid, the range of dynamic damping ratios is effectively widened, and a more effective control range is provided for a high-speed impact and low-speed vibration control system; both the electric energy feedback performance and movement state self-sensing performance are realized, energy supply of a semi-active magnetorheological damper and the control system of the semi-active magnetorheological damper is achieved, and the problems, related to installation space, system weight, cost and reliability, caused by additional installation of a state feedback sensor are solved.

The invention discloses an automobile shock-reducing rubber spring and a preparation process thereof, and relates to the technical field of production of automobile rubber. The automobile shock-reducing rubber spring comprises the following components in parts by weight: 100Phr of natural rubber, 3-7Phr of zinc oxide, 0.5-3.5Phr of an anti-aging agent RD, 2-5Phr of an anti-aging agent 4010NA, 1-3Phr of a dispersant, 1-3Phr of stearic acid, 35-50Phr of carbon black, 2-5Phr of an accelerant, 7-13Phr of paraffin, 4-9Phr of aromatic hydrocarbon oil, 1-3Phr of sulfur S8 and 2-5Phr of a coupling agent. The invention also discloses a preparation process of the automobile shock-reducing rubber spring, and the preparation process comprises twelve process steps of plastifying, standing, mixing, slice discharging, strip cutting, metal frame treatment, surface treatment, rubber cement spraying, vulcanization, trimming, checking and warehousing. The rubber spring produced by the method disclosed by the invention is excellent in mechanical property, good in fatigue resistance and shock-reducing property, wide in material source and low in preparation cost.

The invention discloses a flat specimen high-temperature tension-compression fatigue test clamp and method. The clamp and method implement clamping on the flat specimen in a high-temperature test, so that the flat specimen can be subjected to the tension-compression test under high-temperature conditions. A fatigue machine hydraulic clamping head clamps an optical rod end of a central shaft and is connected with a connecting rod through a sleeve, and the central shaft is provided with a fixing nut which is used for restricting the downward displacement of the sleeve; the connecting rod is fixed with the sleeve through a screw; the connecting rod is connected with a wedge clamp body through threads; the central shaft penetrates through a through hole in the middle of the connecting rod, and the shaft end is connected with a guide table; the guide table is positioned in a groove between two wedge clamping bodies, and used for guiding the wedge clamping blocks to move up and down; the specimen is clamped by the wedge clamping blocks in the wedge clamp body, the bottoms of the wedge clamping blocks are abutted by the top end of the guide table, and both ends contact the wedge surface inside the wedge clamp body so as to restrict the upward displacement of the clamping blocks; and the top ends of locking threads extending from threaded holes on both sides of the wedge clamp body contact the square clamping blocks, so that the square clamping blocks abut against both sides of the clamp blocks, thereby restricting the downward displacement of the wedge clamping blocks.

The invention discloses a self-regulation type single point mooring system. The self-regulation type single point mooring system is formed by a mooring device, a floating cylinder device, a connecting device and a control device, wherein the mooring device comprises a mooring cable, a connecting chain, a suspending heavy block and an undersea anchoring device; the floating cylinder device is formed by a mooring rotary disk which is arranged at the bottom end, a rotating shaft, a mooring floating cylinder and a rotating connector; the connecting device is provided with a damping connecting arm and a connecting rod; and the mooring floating cylinder can do 360-degree rotation along the rotating shaft through the rotating connector, the damping connecting arm is rigidly connected with a ship body, the connecting rod is in butt joint with the damping connecting arm after being hinged with the mooring floating cylinder, and thus the ship body can do 360-degree rotation along a floating cylinder. According to the self-regulation type single point mooring system disclosed by the invention, the recovery ability and the stability of the mooring system can be increased by adding the suspending heavy block, the mutual winding of vertical tubes is avoided due to the application of the rotating shaft and the rotating connector, the operation safety is ensured, and the connecting device under the action of the control device is rigid and flexible.

The invention provides a compounding process of a surface strengthening layer of a piston rod, which is characterized by comprising the following steps: whasing oil stains and impurities on the working surface of the piston rod, sending 18-8 type austenitic stainless steel powder gas to the working surface of the piston rod, radiating with laser so as to clad stainless steel powder on the working surface of the piston rod and form a stainless steel cladding bottom layer with the thickness of 1-3mm, further sending 1Cr13 type martensitic stainless steel powder gas onto the bottom layer, and radiating with the laser so as to clad the stainless steel powder on the bottom layer of the working surface of the piston rod and form the stainless steel cladding strengthening layer with the thickness of 1-3mm.The compounding process can realize gradient compound strengthening, lead the piston rod of a hydraulic transmission oil cylinder to have longer service life and more balanced operation performances, and avoid the problems of galling of the working surface of the piston rod,leakage of hydraulic oil and the like during the use,caused by lack of cooling lubricating oil or entrance of foreign matters into the cylinder. The process has strong controllability of parameters and is convenient for processing and operation and convenient for industrial large-batch production.

The invention discloses a manufacturing process of a composite cylinder sleeve. In the process, a layer of 18-8 type Austenitic stainless steel is firstly clad on a working surface of a medium carbon quenched and tempered steel or alloy steel cylinder sleeve to be used as a bond coat by a laser cladding technology, and then a layer of 1Cr13 type Martensitic stainless steel is clad to be used as a wear-resistant corrosion-resistant surface layer to realize gradient compounding and strengthening, so the cylinder sleeve of a hydraulic transmission oil cylinder has longer service life and more balanced operation performance, and the problems of cylinder sleeve surface galling, hydraulic oil leakage and the like caused by the frequent reciprocating motion of a piston rod when the working surface of the cylinder sleeve lacks cooling lubricating oil or foreign matters enter the cylinder are avoided. The manufacturing process disclosed by the invention has strong technological parameter controllability, is convenient to operate, and brings convenience industrialized mass production.

The invention discloses a large-span bridge multi-order vortex vibration intelligent control system and method based on active air suction. When a detected wind speed reaches the wind speed at which vortex vibration is generated, the order of the generated vortex vibration is determined; a first air suction mechanism and a second air suction mechanism at corresponding positions of a windward sideare controlled to work according to the order of the vortex vibration; the first air suction device and the second air suction device begin to suck incoming wind; incoming wind is absorbed to form suction air flow on the windward side or a leeward side. Therefore, spanwise interference is formed in the spanwise direction of a box girder, the wind field on a bridge surface is interfered, and the formation of vortex shedding is avoided; and flow vortexes are formed at the upper edge, the lower edge and the lower web plate of a bridge, so that the spanwise correlation of wake vortexes is destroyed, the three-dimensional instability characteristic of wake flow in a vortex vibration process is excited, the vortex vibration response is weakened, the influence on the bridge is reduced, the fatigue damage of bridge components is avoided, and the influence on comfort is avoided.

The invention discloses a high temperature tensile fatigue test fixture for a panel test piece and a method. The clamping for the panel test piece in a high temperature test is realized, so that the tensile fatigue test for the panel test piece can be performed under a high temperature condition. A hydraulic chuck of a fatigue machine is used for clamping an optical rod end of a central shaft and is connected with a connecting rod through a sleeve; a fixing nut is arranged on the central shaft; the fixing nut is used for limiting the downward movement of the sleeve; the connecting rod is fixed with the sleeve through a screw; the connecting rod is in threaded connection with a wedge-shaped chuck body; the central shaft passes through a through hole in the middle of the connecting rod; a shaft end is connected with a guiding platform; the guiding platform is located in a groove between two wedge-shaped clamp blocks and is used for guiding the wedge-shaped clamp blocks to move up and down; the test piece is clamped by the wedge-shaped clamp blocks in the wedge-shaped chuck body; the bottoms of the wedge-shaped clamp blocks are propped by the top end of the guiding platform; the two sides are in contact with the wedge-shaped plane in the wedge-shaped chuck body; the upwards movement of the wedge-shaped clamp blocks is limited. The high temperature tensile fatigue test fixture can meet the requirement for stably clamping the panel test pieces in various sizes and can realize the single-shaft tensile fatigue under the high temperature condition.

The invention belongs to the technical field of computers and particularly relates to the ruggedized computer case. The ruggedized computer case is characterized in that two sides of a printed board are connected with a wedge-shaped locking device, the wedge-shaped locking device is fixedly connected with a case body through a guide groove formed in the case body and comprises a wedge-shaped block, a left moving slide block, a right moving slide block, a locking screw and a guiding groove plate, the locking screw is sleeved with the guiding groove plate, the right moving slide block and the wedge-shaped block respectively, the left moving slide block and the right moving slide block are connected with the surface of the wedge-shaped block and can slide along the surface of the wedge-shaped block, the wedge-shaped block is fixedly connected with the guiding groove plate, and the guiding groove plate is matched with a guiding groove. The ruggedized computer case has the advantages that the case can be resistant to long-term vibration and impact and can ensure that electronic devices are not fatigue and are not damaged, and the service life is prolonged.

The invention relates to a magnetostrictive following turning mechanism. The magnetostrictive following turning mechanism comprises a spherical base, a leftward-rightward magnetostrictive rod, an upward-downward magnetostrictive rod and a xenon lamp lens assembly; the leftward-rightward magnetostrictive rod and the upward-downward magnetostrictive rod are respectively arranged at the lower part and the upper part of a xenon lamp lens assembly frame; a spherical support is arranged at the lower part of a lamp bowl of the xenon lamp lens assembly; a spherical head is arranged at the lower part of the spherical support and can rotate in the spherical base; the leftward-rightward magnetostrictive rod is driven to be stretched or contracted through an electromagnetic module so as to drive the xenon lamp lens assembly to move leftwards and rightwards; and the upward-downward magnetostrictive rod is driven to be stretched or contracted through the electromagnetic module, so as to drive the xenon lamp lens assembly to move upwards and downwards. According to the magnetostrictive following turning mechanism, a lamp can be 'upwards and downwards' and 'leftwards and rightwards' adjusted based on the magnetostrictive principle according to the characteristic that the degree of freedom in the spherical contact movement direction is high; the magnetostrictive rod can be relatively sensitive, stable and reliable in transmission; and the following turning mechanism has a good application prospect in vehicles, and is worthy to being greatly popularized and applied.

The artificial carbon humeral prosthesis consists of carbon humeral ball and carbon humeral handle, the humeral ball has fixing slot in its bottom and the humeral handle comprises fixing column and humeral handle rod. The fixing column is embedded into the fixing slot, and the axis of the humeral ball joint surface and the axis of the humeral handle rod form one angle of 135-145 deg. The humeral carbon ball of the present invention has high mechanical strength and high chemical stability, no cell toxicity, no irritability, no genetic toxicity, good biocompatibility, elastic modulus near that of bone, osteoplastic activity and lubricating property. The humeral handle has high mechanical strength, high corrosion resistance and good biocompatibility. The present invention is suitable for use in case of replacing humerus.

The invention provides a C-shaped independent liquid tank in a liquefied gas ship. The C-shaped independent liquid tank comprises two cylindrical liquid tank bodies which are arranged side by side and fixed together; domes are arranged on the top surfaces of the two liquid tank bodies correspondingly; material openings are formed in the domes correspondingly; deep well pumps extending into the liquid tank bodies are arranged on the material openings correspondingly; fixed supporting seats and sliding supporting seats which correspond in position are arranged on the bottom surfaces of the two liquid tank bodies correspondingly; the fixed supporting seats and the sliding supporting seats are all of circular arc-shaped structures arranged in the width directions of the liquid tank bodies; a plurality of floating stopping devices are arranged at the tops of the two liquid tank bodies correspondingly; laminated wood is arranged at the bottoms of the fixed supporting seats and sliding supporting seats correspondingly; and liquid accumulation grooves are formed in the inner bottom faces of the two liquid tank bodies correspondingly. The C-shaped independent liquid tank is reasonable in structure, safety and reliability of the position relationship between a tank body structure of the liquid tank and a hull can be guaranteed, loads are effectively transmitted, and all kinds of stress strain and fatigue damage of the liquid tank and a hull structure do not occur, so that the ship can safely conduct transportation.

The invention discloses a piezoelectric electret film key. The piezoelectric electret film key is characterized in that a piezoelectric electret film is adopted as a force sensitive element of the key; a plurality of key areas are arranged on the piezoelectric electret film; the upper surface and the lower surface of the piezoelectric electret film are coated with upper surface electrodes and lower surface electrodes which are vertical to the key areas and are in one-to-one correspondence with the key areas; the outer layers of the upper surface electrodes are covered with one surface layer; the lower surface electrodes are bonded on a key base layer; an upper surface encapsulation layer is arranged between the surface layer and the upper surface electrodes; a lower surface encapsulation layer is arranged between the lower surface electrodes and the base layer; and a shielding layer is arranged between the lower surface encapsulation layer and the base layer. The piezoelectric electret film key is advantageous in high sensitivity and strong stability. The piezoelectric electret film key is flexible and can be bent freely, and can identify key pressing strength and has functions such as sliding control.

The invention relates to roll-welded pipe spiral electroplating equipment and an electroplating method thereof. In the roll-welded pipe spiral electroplating equipment, a roller is arranged in an electroplating tank, so that blank roll-welded pipes can be wound on the roller spirally to perform rolling electroplating. The roll-welded pipes are wound on the roller spirally to fulfill the aim that more blank roll-welded pipes are put into the electroplating tank with the same volume and are electroplated continuously, and the floor space of the electroplating equipment is reduced, and the cost of the equipment is saved while the electroplating efficiency is improved.

The invention relates to an intelligent steering system of a vehicle lamp. The intelligent steering system comprises a smooth spherical supporting seat, a left-and-right steering magnetostriction rod, an up-and-down moving magnetostriction rod and a light emitting diode (LED) lamp set, wherein the left-and-right steering magnetostriction rod is arranged at the lower part of a machine frame of the LED lamp set, and the up-and-down moving magnetostriction rod is arranged at the upper part of the machine frame of the LED lamp set; a spherical bracket is arranged at the lower part of a lamp bowl of the LED lamp set; a ball head is arranged at the lower part of the spherical bracket, and can rotate in the smooth spherical supporting seat; the left-and-right steering magnetostriction rod is driven to extend or shorten by an electromagnetic control device, so that the left-and-right movement of the LED lamp set is realized; and the up-and-down moving magnetostriction rod is driven to extend or shorten by the electromagnetic control device, so that the up-and-down movement of the LED lamp set is realized. According to the intelligent steering system disclosed by the invention, a magnetostriction principle is utilized, and according to the amplifying effect that the freedom degree in the contact movement direction of a spherical surface is high, the "up-and-down" adjustment and the "left-and-right" adjustment of the lamp are realized; besides, the transmission of the magnetostriction rods is sensitive, stable and reliable; and the automatic steering system has a good application prospect in vehicles, and is worth widely popularizing and applying.

The invention provides a valve, which solves the leakage problem caused by the invalidation of the sealing of a rubber film in the prior art. The technical scheme is as follows. The valve comprises a valve body and a valve shell. The valve body is provided with a switching orifice and a large looping. The large lopping of the valve body adopts fixed non-rubber sealing which is a nut connected with the large looping of the valve body through threads. The upper part of the nut is connected with a sleeve in a sealing manner. The nut and the sleeve are metal material or nonmetal hard material, which do not attract magnet. The invention adopts the metal material or nonmetal hard material sealing, abandons the conventional rubber film sealing and avoids the gas leakage phenomenon caused by the invalidation of the rubber film after long-period use. Because of the fixed connection, damage caused by frequent movement does not exist. The sealing is reliable.

A closed-type petroleum and petrochemical flare horizontal pipeline deformation compensation system based on a rotary compensator is characterized in that it includes at least one closed rotary compensator installed on the flare horizontal pipeline, and the closed rotary compensator consists of four rotary compensators The compensator (3) is composed of two vertically installed tee pipes (2), the upper connecting pipe (4) and the lower connecting pipe (5). The corresponding ports of the horizontal torch pipe (1) of the same straight line are connected, and the two vertical nozzles of each three-way pipe (2) are respectively connected with a rotary compensator (3), and the upper ends of the two three-way pipes (2) The rotary compensator (3) is connected through the upper connecting pipe (4) to form a pipeline for the circulation of the gaseous medium, and the rotary compensator (3) located at the lower end of the two tee pipes (2) is connected through the lower connecting pipe (5) to form a pipeline for the circulation of the gaseous medium. Pipelines for the flow of liquid media. The invention has the advantages of long compensation distance, small investment, safety and reliability.

The invention provides a preparation method of silicon nitride ceramic with a high thermal conductivity. The preparation method comprises the following steps that (1) 70-80 parts of silicon nitride, 5-10 parts of rare earth oxide and 2-6 parts of a sintering aid are weighed in parts by weight, evenly mixed, and then added into a ball mill to form mixed powder, then continuous drying is conducted in a vacuum electric heating drying oven at the temperature of 110 to 120 DEG C, the completely-dried mixed powder is sieved in hydrogen airflow under a temperature condition of minus 20 to 0 DEG C to obtain composite powder; and (2) the composite powder obtained in the step (1) is packaged into a graphite die of a discharge plasma sintering device, discharge plasma sintering is conducted after vacuumization is conducted with a heating speed being 10 to 15 K / s, a heating temperature being 1450 to 1700 DEG C and a thermal insulation time being 3-8 min, and then the compact silicon nitride ceramic is obtained, wherein the sintering aid is a mixture of aluminum oxide, manganese oxide and boric oxide. By adoption of the preparation method, silicon nitride crystalline grains can be purified, and the thermal conductivity can be increased.

The invention discloses an outer wetback device of an oil and gas burning steam water boiler. The outer wetback device comprises a smoke chamber. The smoke chamber is enclosed by an outer wetback tube plate, side wetback plates and an inner wetback plate, the outer wetback tube plate is positioned on the front surface of the smoke chamber, the side wetback plates are positioned on two side surfaces and the lower surface of the smoke chamber, the inner wetback plate is positioned on the rear surface and the upper surface of the smoke chamber, an outer wetback plate is further arranged on an outer layer of the inner wetback plate, a cavity is enclosed by the outer wetback plate and a shell of the boiler, the smoke chamber is accommodated in the cavity, an internal space of the smoke chamber is communicated with a first return boiler furnace of the boiler and a second return smoke tube, and a cavity space on the outside of the smoke chamber is filled with to-be-heated water in the boiler. The outer wetback device has the advantages that fuel consumption can be reduced, the heat efficiency of the boiler can be improved, the running cost can be lowered, and the service life of the boiler can be greatly prolonged.

The invention discloses a modified fiber reinforced anticorrosive paint, and a preparation method and application thereof. The modified fiber reinforced anticorrosive paint comprises matrix resin, graphene powder, talcum powder, sodium thiosulfate, titanium white powder, dopamine modified fibers, a coupling agent, wollastonite powder, a solvent and the like. The anticorrosive paint of the invention uses dopamine-modified polymer staple fibers as a functional filling material, so the bonding force between the polymer staple fibers and the resin can be enhanced through modification of dopamine,and the impact resistance of a coating formed by the anticorrosive paint can also be effectively improved by utilizing the toughness of the polymer; and thus, when used in the spray-splashing zones ofmarine facilities, the coating is effectively reduced in fatigue cracking and peeling caused by the impact of spray, and in particular, the coating can effectively absorb and transform impact force to protect the coating from fatigue damage caused by the impact force during impacting and beating of the spray. The preparation method for the anticorrosive coating of the invention is simple in process, easily controllable in conditions and suitable for large-scale production, and has good application prospects.

The invention discloses a laser cladding reinforcing process of a motor central spindle. In the reinforcing process, a layer of 18-8 type austenitic stainless steel serving as a base coat is cladded by laser cladding technology at the bearing position of the central spindle, and then a layer of 1Cr13 type martensite stainless steel serving as a wear-resistant and corrosion-resistant surface layeris cladded, so that stepped reinforcement is realized, the service life of the motor central spindle is prolonged, operating performance is balanced, and using problems such as corrosion of the central spindle at the bearing position, shaft deviation caused by wear, roughing of a bush and the like are solved. In the process, parameter controllability is high, machining operation is convenient andindustrial batch production is convenient.

The invention discloses a full-flexible asphalt pavement structure design method, belongs to the field of asphalt pavement structure design in road engineering, and aims to solve the technical problem that the existing asphalt pavement structure design is disjointed from material design. According to the technical scheme, the method specifically comprises the steps of S1, determining the accumulative equivalent axis number Ne within the design age limit of a full-flexible asphalt pavement structure, and preliminarily planning the pavement structure; S2, testing and calculating the asphalt concrete complex modulus of the horizon, and constructing an asphalt concrete fatigue model; S3, according to an asphalt concrete strain allowable value calculation formula, calculating an asphalt mixture layer bottom flexural-tensile strain allowable value epsilon t-allowable; S4, calculating a roadbed top surface compressive strain allowable value epsilon z-allowable according to a roadbed top surface compressive strain calculation formula; S5, determining a bending-tensile strain calculation value epsilon t-calculation and a soil-based compressive strain calculation value epsilon z-calculation of a structural calculation layer by applying an elastic layered system theory; and S6, carrying out structure checking calculation by taking the conditions that the bending-tensile strain allowable value epsilon t-allowable is greater than the calculation value epsilon t-calculation of the bottom of the asphalt mixture layer and the compressive strain allowable value epsilon z-allowable is greater than the calculation value epsilon z-calculation of the top of the soil foundation as checking calculation indexes.

The invention discloses a petroleum and petrochemical torch horizontal pipeline deformation compensation method and a petroleum and petrochemical torch horizontal pipeline deformation compensation device based on a rotary compensator. The method is characterized by comprising the following steps of: firstly, connecting two pipe ends at a corner of a torch horizontal pipeline or pipe ends of two parallel pipelines with a three-way pipe respectively; secondly, connecting two vertical straight ends of each three-way pipe with rotary compensators; and finally, communicating the rotary compensators at upper ends of two three-way pipes through an upper communicating pipe so as to circulate a gaseous medium, and communicating the rotary compensators at lower ends of the two three-way pipes through a lower communicating pipe so as to circulate a liquid medium; therefore, the whole petroleum and petrochemical torch horizontal pipeline is subjected to deformation compensation in a length direction, and the circulation of gaseous and liquid phase media is not influenced. The compensation system consists of an enclosed compensation system and a branch compensation system, which consist of three-way pipes and rotary compensators. The system has the advantages of long compensation distance, low investment, safety and reliability.