324results about How to "Reduce concentrated stress" patented technology

The invention relates to the field of communication and transportation, in particular to a ballastless track board lifting support. The ballastless track board lifting support comprises a threaded rod, a plurality of buckles, two fixing nuts matched with the threaded rod, and four supporting rods made of channel steel; the ends of two adjacent supporting rods are rotationally connected with one buckle, and the four supporting rods are connected end to end in sequence to form a quadrilateral supporting frame; the lengths of two adjacent supporting rods in the supporting frame are the same; the threaded rod penetrates through two through holes in one group of the symmetrical buckles in the support at the same time to be connected with the through holes in a sleeved mode, and the two fixing nuts are arranged at the two ends of the threaded rod to be used for positioning the two buckles; in another group of vertexes, one vertex is fixed onto a base board through one buckle, and the other vertex is fixed onto a truck board through one buckle. According to the ballastless track board lifting support, concentrated stress on the damaged track board in a lifting process is reduced, and therefore the possibility that the track board is damaged in a lifting repair process is further reduced.

A connector for a printed circuit board including a board-shaped housing with windows and connecting terminals arranged for the windows. An intermediate part of each connecting terminal is fixed to a housing part at an edge of the window, and a contacting part of the connecting terminal is arranged so that it can undergo elastic deformation in the window in the direction of thickness of the housing near the top of the housing. The external end of the connecting terminal is formed as a lead, and the connecting terminal is provided with a reinforcing lead that extends from the intermediate part toward the bottom of the housing in the window. If necessary, a reinforcing frame is embedded in the housing. A production method thereof is indicated by example, wherein connecting terminals and a frame being connected together are press-formed, and they are integrally molded with the housing, then the connecting terminals and the frame are disconnected from the rest.

The invention belongs to the technical field of building structure engineering, and relates to a rectangular steel tube concrete column and steel beam all-bolt connecting joint, which comprises a rectangular steel tube concrete column, a steel beam, an upper through partition board, a lower through partition board, a connecting plate and high-strength bolts. The upper through partition board and the lower through partition board penetrate through a wall of the rectangular steel tube concrete column, and are connected with the periphery of the wall of the rectangular steel tube concrete column via grooved weld joints, the connecting plate is welded with a side wall of the column, the upper through partition board and the lower through partition board, a web plate of the steel beam is connected with the connecting plate via the high-strength bolts, and an upper flange and a lower flange of the web plate of the steel beam are respectively connected with the upper through partition board and the lower through partition board via the high-strength bolts. The invention further discloses a method for manufacturing the rectangular steel tube concrete column and steel beam all-bolt connecting joint. The joint is fast in construction, simple in structure and fine in stress performance and seismic performance, and can meet requirements of outwards movement of plastic hinges.

The invention discloses a hybrid welding method and hybrid welding equipment for laser electromagnetic pulse. The method can be used for laser seam welding and laser spot welding technology, a pulsed high magnetic field is applied to a welding region during the process of laser welding on a workpiece with the effect of laser beams so as to mutually react with an induced plasma, a welding pool and a stress strain field through welding and complete welding task. The equipment comprises a laser device, an electromagnetic pulse generator, a numerical control system, an optical transmission system and a laser electromagnetic pulse combined machining head. The combined machining head is used for integrating the laser beams with the pulsed high magnetic field and adjusting the distance between an electromagnetic conversion device and the workpiece; the combined machining head is arranged on a machine tool. The structural deformation can be reduced, the welding quality and machining efficiency are improved, and insurmountable technical problems when a metallic material structure is manufactured through existing single welding technology are solved.

The invention discloses a pulsed high magnetic field auxiliary laser welding method and device. The method and device can be applied to laser spot welding and seam welding. According to the method, in the overall welding process, laser beams are emitted to a workpiece to form a welding connector, a high pulsed magnetic field is exerted to the welding connector which is just solidified and the surrounding area, the pulsed magnetic field generates pressure stress on the surface of the workpiece to enable the connector area to have plastic deformation, residual stress is released to lower the degree of stress concentration and the degree of structural deformation of the welding connector, and the fatigue strength of the welding connector is improved. The device comprises a laser, a pulsed magnetic field generator, a numerical control system, an optical transmission system and a laser pulsed magnetic field composite processing head. The processing head is used for integrating the laser beams and the high pulsed magnetic field, and regulating the perpendicular distance between an electromagnetic conversion device and the surface of the workpiece and the horizontal distance between the electromagnetic conversion device and the laser beams. By means of the pulsed high magnetic field auxiliary laser welding method and device, structural deformation can be lowered, welding quality and processing efficiency are improved, and the processing effect which is superior to that of an existing laser welding process is achieved.

An all-bearing car body structure of a new-energy urban bus comprises a front wall assembly, a rear wall assembly, a top cover assembly, a bottom frame assembly, a support upright assembly and a closed stressed ring structure of a whole car body, wherein the closed stressed ring structure is formed by two side wall assemblies, the two ends of the support upright assembly are connected with the top cover assembly and the bottom frame assembly, so that the closed stressed ring structure is formed on the cross section of the car body conveniently, meanwhile, a two-layer frame cavity structure arranged in the top cover assembly not only facilitates the placement of energy storage equipment, but also optimizes the space in a car. According to the design, the passenger space in the urban bus is optimized, and the overall bearing uniformity of the car body structure is improved, moreover, the delivery effect of the local structure is stronger, and the closed stressed ring structure is arranged on the support upright assembly.

The invention belongs to the technical field of architectural structure engineering and relates to a rectangular concrete filled steel tubular column - steel beam connection node. The rectangular concrete filled steel tubular column - steel beam connection node comprises an upper through partition board (3), a lower through partition board (4), a connection board (5) and a high-strength bolt (6). The rectangular concrete filled steel tubular column - steel beam connection node is characterized in that the upper through partition board (3) and the lower through partition board (4) penetrate through the wall of a rectangular concrete filled steel tubular column (1) and are in bevel welding connection with the periphery of the wall, the connection board (5) is connected between the lateral wall of the rectangular concrete filled steel tubular column (1) and a web of a steel beam (2), the lower through partition board (4) is connected with the bottom flange of the steel beam (2) through the high-strength bolt (6), and the upper through partition board (3) is in bevel welding connection with the upper flange of the steel beam (2). The invention further provides two construction methods of the rectangular concrete filled steel tubular column - steel beam connection node. The rectangular concrete filled steel tubular column - steel beam connection node and the construction methods thereof have the advantages that location is fast for site installation, the construction period can be shortened obviously, and the prefabricated construction progress is promoted.

The present invention discloses a connection structure of an airframe-airfoil of an unmanned aerial vehicle, which is realized by the connection of a pair of front and back joints of the airfoil and a pair of front and back joints at the oil box soleplate of the airframe that is the front joint of the airfoil is connected with the front joint of the airframe by bolts, and the back joint of the airfoil is connected with the back joint of the airframe by bolts. The airfoil and the airframe are linked just by four pairs of joints and four connection pieces, and the force transmission of the connection pieces is reasonable, which reduces the connection of joint parts and the concentration of stress; a majority of load is discharged during flying, which improves the anti-fatigue performance. The present invention has the characteristics of small size, good flexibility and large production batch. The structure can improve the rigidity of the joints to ensure the firm connection of the airframe and the airfoil and the high efficiency of the structure, and the structure belongs to the external connection, which has strong changeability and meets the requirement of combat readiness.

A static breaking roof cutting and pressure releasing method for a gob-side retained roadway comprises the steps that the roof cutting position is selected; the intervals, diameters, angles and depths of drilled holes are determined; drilling construction and charging are conducted; the dosage of static blasting agents is calculated; and punching, charging and hole sealing serve as one time of roof cutting and pressure releasing working circulation and are conducted circularly. Roof cutting and pressure releasing construction is conducted in the retained roadway on the rear portion of the working surface, so that the working procedures of punching, charging, hole sealing and the like, working surface stoping and manual wall building do not interfere with one another, and smooth conducting of roof cutting and pressure releasing is facilitated; and roof cutting beside the roadway is achieved before retained roadway surrounding rock deforms to destroy a suspending roof structure of the retained roadway gob side, so that a suspending roof beside the roadway fully collapses, the stress environment is improved, and the purpose of reducing stress concentration and mining pressure of a roof on the side of the gob-side retained roadway is achieved.

The invention discloses a tunnel flexible ring type supporting system suitable for passing through a movable fault zone. The tunnel flexible ring type supporting system is characterized in that a surrounding rock grouting reinforcement layer, a primary support layer, an anchor net layer, a steel bar row, a first annular steel arch, a rubber cushioning layer, a second annular steel arch, supportingoil cylinders, a third annular steel arch, a rubber particle filling layer and a prefabricated steel pipe tunnel. The primary support layer achieves excavation forming on the section of the channel,after the procedure of grouting reinforcement is completed, pavement of ribbed steel bars and injection of concrete are carried out along the annular outline of tunnel surrounding rock, and after maintenance is finished, construction of the primary support layer is completed; the anchor net layer fixes a dense-hole steel bar net onto the primary support layer through anchor rods; the steel bar rowis paved on the anchor net layer in the axial direction of the tunnel; and the multiple supporting oil cylinders are distributed in the axial direction and the radial direction of the tunnel in an array manner.

The permanent anchor rope for stabilizing slope is composed of external anchoring head, internal anchoring part and free part, and said internal anchoring part is formed from guy rope and more than one group of internal anchoring end bearing components which are distributed along the vertical direction, every group of bearing components has pressure-bearing plate and vertical pressure-beaning column whose lower end is fixedly connected with pressure-bearing plate, and the upper end of the guy rope is anchored to the external anchoring head, and its lwoer end is grouped and distributed in different bearing components, and respectively fixedly connected with pressure-bearing plate of correspondent group bearing component. Said invention can make the stretching force of anchor rope obtain permanent retention.

The invention provides a glass cover plate hot bending die and a hot bending preparation system and process of a glass cover plate.The glass cover plate to be processed is provided, the glass cover plate hot bending die comprises a lower die body, a cavity and four or more glass balls, the cavity is formed in the lower die body, the four glass balls are evenly distributed between the cavity and the lower die body, the glass cover plate to be processed is arranged on the cavity, and when the glass cover plate hot bending die is heated to be close to and lower than the lowest softening temperature of the glass cover plate to be processed, the glass cover plate to be processed and the glass balls are softened and deformed after being pressed.Due to the arrangement of the glass balls, the action of force originally exerted on the glass cover plate to be processed is dispersed evenly, so that the problem that the local area of the glass cover plate to be processed is uneven or concentrate in stress due to excessively large pressure is reduced.

The invention relates to a two-freedom-degree limit anisotropic flexible biomimetic ankle which comprises a connector for being connected with a prosthetic socket, a connecting rod connected to the lower end of the connector, a spring mounting bracket connected to the middle of the connecting rod, a central sphere pin pair connected to the lower end of the connecting rod, an ankle limit end cover arranged on the upper portion of the central sphere pin pair and a sphere pin pair base arranged below the central sphere pin pair. A limit cambered surface with four spring guide holes is arranged at the upper end of the ankle limit end cover, and an inner spherical surface is arranged at the lower end of the ankle limit end cover. The spring mounting bracket is supported in the limit cambered surface through four spiral compression springs installed in the four spring guide holes. An inner spherical surface is arranged at the upper end of the sphere pin pair base. The central sphere pin pair is in clearance fit with the inner spherical surface of the ankle limit end cover and the inner spherical surface of the sphere pin pair base, and a bolt pin on the side face of the central sphere pin pair is in clearance fit with a bolt pin guide groove in the ankle limit end cover and a bolt pin guide groove in the sphere pin pair base. The two-freedom-degree limit anisotropic flexible biomimetic ankle has two degrees of freedom, can perform plantar flexion, dorsal flexion, introversion and extroversion, has different angle ranges and flexibility in each direction, and enables an amputee to walk on a more complicated pavement.

The invention relates to a double-layer anchoring and balancing arch supporting system for a coal roadway with extremely-weak top plates. A roadway waste section is enlarged to be reserved for deformation, the roadway section is a tangential arching breaking face, a metal net and a reinforcing steel bar stair joist is laid on the surface of the roadway, anchor rods are installed on the top plate of the roadway and on sides of the roadway and penetrate through the metal net and the reinforcing steel bar stair joist to be anchored into a coal bed through an anchoring agent, anchor rod trays are used for exerting pretightening forces on anchor rods to form anchor net preliminary supporting, anchor cables are installed among anchor rods on the top plate of the roadway and penetrate through the metal net and the reinforcing steel bar stair joist to be anchored into the coal bed through the anchoring agent, and anchor cable trays and locks are used for exerting pretightening forces on anchor cables to form secondary prestress anchor cable reinforcing supporting. The double-layer anchoring and balancing arch supporting system for the coal roadway with extremely-weak top plates is low in construction cost, good in supporting effect, simple, practical and economical.

Provided is a stent such that there is minimal occurrence of strain or of stress concentration in a drug coated layer as a consequence of expansion and deformation of the stent in the radial direction thereof, and that as a result, there is no risk of the drug falling off. The aforementioned stent is characterized in that the thickness (B) of the drug coated layer (4) formed by coating the outer surface of a stent body (2) gradually decreases toward a bending section (K), that reduction is made to the strain and stress which occur in the drug coated layer (4) as a consequence of expansion and deformation of the stent (1), and that as a result, the drug is prevented from falling off.

The invention relates to a construction method for a prefabricated integrated stairway. The method includes the specific steps of mould construction, stairway component part construction, preparation before stairway installation, sliding support installation, stairway component installation and construction, and construction after stairway component installation. According to the construction method for the prefabricated integrated stairway, the prefabricated integrated stairway is good in forming quality, high in prefabrication and installation speed, low in comprehensive cost and good in seismic performance and does not need secondary decoration. Through popularization from the perspective of the prefabricated integrated stairway, progressive application of fabricated buildings is achieved.

The invention relates to a multi-locomotive fixing and rolling test platform which comprises two or three test platforms. Each test platform comprises a pair of counter-force frames (1), an upper axle (2) and test unit groups, wherein the test unit groups comprise test units having same number with single locomotive wheel pairs (41). All the test units adopt the structure that shafts of a track wheel pair (43) for supporting the locomotive wheel pairs (41) are connected with shafts of winding asynchronous motors (36), and the diameter / length ratio of the winding asynchronous motors is larger than 1; stator windings of all the winding asynchronous motors (36) of each test unit group are connected with a power grid by a three-phase switch I (63) of a stator three-phase bus bar (53) of each asynchronous motor, and rotor windings are connected in parallel to a rotor three-phase bus bar (49) of each asynchronous motor; and the rotor three-phase bus bars of the asynchronous motors of all the test unit groups are connected by a breaker (62). The test platform carries out a mutual accompanying test by multiple locomotives and has reliable synchronization and convenient test and can form the mutual feedback of energy, reduce the capacity of a power supply and save energy sources and cost.

The invention provides an all-steel-assembled buckling restrained brace with the lateral side capable of being inspected. Welded joints at the ends of stiffening ribs are smoothed, the low-cycle fatigue performance of the brace is effectively improved, the plastic deformation capability of steel is adopted, and meanwhile the state of an inner core can be easily judged through the lateral side after a seism. The all-steel-assembled buckling restrained brace solves the problems that the deformation or damage state of the inner core cannot be conveniently evaluated rapidly after a seism, the welded joints at the ends of the stiffing ribs have quality defects, and the damaged inner core cannot be conveniently replaced. The buckling restrained brace achieves the aims that the deformation state of the inner core can be judged without detaching, and whether the inner core should be replaced or not can be rapidly evaluated after a seism; the welded joints at the ends of the stiffing ribs are processed, the middle cross section of the inner core is possibly damaged, and the low-cycle fatigue performance of the brace is improved; an assembled scheme is adopted, and the damaged inner core can be conveniently replaced. The all-steel-assembled buckling restrained brace comprises the inner core, the end stiffing ribs, two restrained face plates, gaskets, limiting grooves and high-strength bolts.

The invention discloses a sample preparation device and method for tensile test of soil engineering and a testing method. The sample preparation device comprises a sample preparation mold, wherein anintermediate tensile section of the sample preparation mold and tensile fixtures at the two ends of the sample preparation mold are detachably connected. After the accurate compaction treatment is carried out on a test sample by adopting an improved layered compaction device, the intermediate tensile section of the sample preparation mold is dismantled, and the test sample, the two ends of which are clamped by the tensile fixtures, is obtained; and the tensile fixtures are connected to a testing machine, so that the tensile test of the test sample can be carried out. The sample preparation device for the tensile test of soil engineering is simple in structure and improves the precision of sample preparation and the convenience of testing.

The invention relates to a flexible connection structure for a pile and a pile cap. The flexible connection structure comprises a top end steel plate, an elastic sleeve, an embedded steel plate and a plurality of shear nails, wherein the pile is a steel pipe concrete pile which comprises a steel pipe; concrete is poured into the steel pipe; the top end steel plate is welded and fixed at the top end of the steel pipe; the elastic sleeve sleeves the top end steel plate and the steel pipe; the multiple shear nails are welded and fixed at the tops of the embedded steel plate; the multiple shear nails and the embedded steel plate are arranged in the pile cap; the pile cap sleeves the top end of the pile, and a blind hole matched with the elastic sleeve is formed in a position, located on the embedded steel plate, on the pile cap; the bottom of the embedded steel plate is in contact with the tops of the elastic sleeve and the top end steel plate. The invention further relates to a construction method of the flexible connection structure for the pile and the pile cap. According to the flexible connection structure, a pile head and the pile cap rotate relatively, so that a transverse displacement allowance of the top structure is increased; meanwhile, the bending moment of the pile can be obviously reduced due to the transverse displacement.

The invention discloses a fireproof and buckling-restrained fabricated composite beam, and belongs to the field of house construction. The fireproof and buckling-restrained fabricated composite beam mainly comprises a prefabricated reinforced concrete slab, a wrapped concrete steel beam, a friction-type high-strength bolt connect set and a rubber sleeve; the prefabricated reinforced concrete slab and the wrapped concrete steel beam are connected into a whole through the friction-type high-strength bolt connect set and the rubber sleeve. According to the fireproof and buckling-restrained fabricated composite beam, through combination of the design philosophy of a recoverable structure, the prefabricated reinforced concrete slab, the wrapped concrete steel beam, the friction-type high-strength bolt connect set and the rubber sleeve are combined mutually, the bearing capacity of steel components is improved, the anti-corrosion and fireproof treatment cost of the steel components is saved, the suitable range of the composite beam is enlarged, fabricated construction of the composite beam is achieved, the time spent on in-situ reinforced assembling, concrete pouring and concrete maintenance is saved, the construction period is shortened to a large extent, the construction efficiency is improved, and the fireproof and buckling-restrained fabricated composite beam has wide application prospects in building structures with steel structures.

The invention discloses a rubber tire container gantry crane. The hoisting mechanism of the rubber tire container gantry crane is composed of a hydraulic pump station and four multistage hydraulic oil cylinders, wherein the hydraulic pump station and the hydraulic oil cylinders are respectively mounted on the upper and lower sides of a trolley frame, synchronous telescoping of each hydraulic oil cylinder is controlled by the hydraulic valve of the hydraulic pump station, and a sling is cooperatively used so as to realize loading and unloading of containers. According to the invention, usage of a traditional hoisting mechanism above the trolley frame is discarded; a series of electrical control components and parts for electrical control are not used, so a structure is substantially simplified, weight is decreased and cost is reduced; the driving axle of a cart travel mechanism of the crane is connected with a driving mechanism through a chain connected with the sprocket wheel of a transmission shaft so as to provide power for running of the whole machine, the driving axle is connected with a driving vehicle frame through a bearing pedestal on the transmission shaft so as to support the whole machine, and the driving axle is connected with the rim of a wheel through a rim flange on the transmission shaft so as to transmit power of the driving mechanism to the wheel, thereby realizing operation of the whole machine; traditional complex axle housing and axle package structures are not used, and corresponding defects caused by the axle housing and axle package structures are overcome.

The invention discloses an erection construction method for single-line box beams and a double-line box beam of an elevated station. The erection construction method comprises the steps that one, a bridge erection machine for erecting the double-line box beam hoists two sleeper beams onto padstones; two, beam moving devices are hoisted onto linear rails and located between the sleeper beams; three, the bridge erection machine for erecting the double-line box beam erects one single-line box beam onto the two beam moving devices; four, the two beam moving devices transfer the single-line box beam to a beam falling position and jack the single-line box beam; five, the beam moving devices are moved back between the sleeper beams and downwards put the single-line box beam onto the two sleeper beams; six, after the single-line box beam is replaced with the other single-line box beam, the steps from step three to step five are repeated; seven, the two single-line box beams are jacked, and the bridge erection machine for erecting the double-line box beam hoists the sleeper beams and the beam moving devices onto the ground; eight, the two single-line box beams are downwards put onto the padstones; and nine, the double-line box beam is erected. By adoption of the erection construction method, construction of the single-line box beams and the double-line box beam is completed through one set of equipment.

The invention provides a laser cladding device and method for slender shaft-like workpieces. The laser cladding is performed by preheating a wire, and the wire is preheated when entering a molten pool, so that the absorption rate of materials to laser is effectively improved; laser power 50% lower than that of ordinary laser cladding is used for wire cladding, so that the heat input of the workpieces is reduced; a movable center is arranged on the tail part of a cladding machine, and the maximum stroke of the movable center is 8mm, it is guaranteed that the workpieces can be expanded and contracted in the axial direction when the workpieces are thermally expanded in the cladding process, and deformation of the workpieces due to excessive stress caused by thermal expansion is avoided; and the segmented cladding technology is used in the cladding operation, excessive concentration and accumulation of heat is effectively avoided, the slender workpieces are dispersed by heat in the laser cladding process, and the cladding deformation of the slender workpieces is effectively reduced. According to the laser cladding device and method for the slender shaft-like workpieces, the applicationof laser cladding technology in the surface treatment process of slender shaft-like workpieces is promoted, and the broad prospect for popularization and application is achieved.

To provide an adhesive comprising an acrylic resin (1), an acrylic resin (2), a silicone oligomer (3) and a crosslinking agent (4) wherein the acrylic resin (1) comprises a structural unit (a) derived from a monomer (A) and a structural unit (b) derived from a monomer (B) and has a weight-average molecular weight of 1,000,000 to 2,000,000, wherein the (A) is a (meth)acrylic ester represented by the formula (A) (wherein R1 represents hydrogen atom or methyl group, and R2 represents alkyl or aralkyl groups having 1 to 14 carbon atoms wherein hydrogen atom(s) of the R2 may be substituted with alkoxy group having 1 to 10 carbon atoms), and the (B) is at least any one of a (B-1) and a (B-2) wherein the (B-1) is a monomer comprising carboxyl group and one olefinic double bond, and the (B-2) is a monomer comprising at least one polar functional group selected from the group consisted of hydroxy group, amide group, amino group, epoxy groups oxetanyl group, aldehyde group and isocyanate group and an olefinic double bond; the acrylic resin (2) comprises the structural unit (a) and the structural unit (b) and has a weight-average molecular weight of 50,000 to 500,000; and the silicone oligomer (3) has 2 to 100 structural units (s) derived from a compound (S) represented by (wherein R3 and R4 represent alkyl group or phenyl group, X and Y represent hydrogen atom, optionally substituted alkyl group, optionally substituted phenyl group, optionally substituted alkoxy group, optionally substituted phenoxy group, optionally substituted aralkyl group, optionally substituted aralkyloxy group, vinyl group, vinyloxy group, 1,2-epoxycyclohexyl group, 1,2-epoxycyclohexyloxy group, styryl group, styryloxy group, methacryloyloxy group, amino group, ureido group, mercapto group or isocyanate group).

The invention relates to an underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method. The underground station strong constraint superposed wall lining cast-in-place concrete structure crack control method comprises the following steps: performing cracking risk evaluation on the key influence factors of superposed wall lining concrete and calculating the quantitative influence on the cracking risk coefficient by different factors; optimally designing lining C35P8 concrete mixed proportion and burying temperature and deformation sensors in parts with high cracking risk; soaking jointing surface concrete with clean water before pouring, performing high-temperature construction, controlling the concrete casting temperature to be less than 26 DEG C, increasing the temperature of a core part to the highest peak value after concrete pouring is completed, dismantling a template after the temperature is obviously reduced, sticking the surface and the top at once after dismantling the template and covering with heat-insulating and moisturizing maintaining cloth; and after maintaining, observing and counting the surface crack condition. By the method provided by the invention, the cracking risk of the superposed wall lining is reduced, the technical problem that the superposed wall lining is liable to crack is effectively controlled and prevented and construction quality is guaranteed.

The invention relates to the field of design of medical apparatuses, and in particular to a fixed plateau type unicompartment knee prosthesis, which comprises a femoral condyle prosthesis, a fixed plateau mat and a tibial plateau prosthesis, wherein the cross section of the tibial plateau prosthesis is similar to a semicircle; a clamping groove is formed in the inner wall of the tibial plateau prosthesis; the fixed plateau mat is clamped in the clamping groove; the upper surface of the fixed plateau mat is a fixed plateau mat is a single-radius cambered surface which is relatively low in curvature; the femoral condyle prosthesis is of a single-radius spherical structure; and the femoral condyle prosthesis is placed on the fixed plateau mat. The product (the fixed plateau type unicompartment knee prosthesis) provided by the invention is strong in bearing capacity, and the product can guarantee stability of buckling and prevent injuries and pain of surrounding soft tissues; the designingmethod of the tibial plateau prosthesis comprises steps of CT scanning, data importing and measuring, data analyzing and designing the Chinese people's anatomical tibial plateau prosthesis, so that the designed tibial plateau prosthesis can conform more to a tibial anatomical structure of Chinese people; therefore, a bone coverage rate and bearing capacity of proximal tibia cortical bone to the plateau prosthesis are improved, a risk of fatigue fracture of the plateau prosthesis is reduced and a survival rate of the prosthesis is improved.

The invention discloses a pressure relief method for fully-mechanized top-coal caving mining of steeply inclined coal seams. The pressure relief method for the fully-mechanized top-coal caving miningof the steeply inclined coal seams comprises the steps that the combination of roadway pressure relief blasting, deep hole blasting pressure relief of a pressure relief roadway and ultra-long hole blasting pressure relief of a coal body in a floor concentrated roadway is adopted, wherein the roadway pressure relief blasting performs blasting pressure relief on the lower slope angle of the side, close to the coal body of a working face, of a mining roadway, and then performs monitoring; if the index is within a normal range, the pressure relief work is completed; if the index is beyond the normal range, according to the actual situation of the working face, deep hole blasting pressure relief of the pressure relief roadway and ultra-long hole blasting pressure relief of the coal body in thefloor concentrated roadway are carried out; according to the deep hole blasting of the pressure relief roadway, blasting pressure relief is further carried out on a coal body stress concentration areaby forming coal body deep hole blasting holes in a bottom coal pressure relief roadway to fully crush the coal body; and according to the ultra-long hole blasting pressure relief of the coal body inthe floor concentrated roadway, coal body ultra-long blasting holes are formed in a bottom plate and a bottom coal area in the concentrated roadway through an original bottom plate concentrated roadway so as to reduce stress concentration and impact hazard degree of bottom coal.

The invention provides a device and method for casting a large-sized compound steel ingot by using a graphite electrode ring for preheating electroslag. The device comprises a T-shaped electric conduction crystallizer, supporting arms and a lined electroslag furnace, wherein two transverse arms on a support are respectively used for lifting and dropping the graphite electrode ring and a self-consuming electrode ring; the lined electroslag furnace is used for slagging and pouring premelting slag into the T-shaped electric conduction crystallizer; and an annular bottom water tank is arranged onan ingot introducing plate. The method comprises the following steps of: (1) putting a core rod in the T-shaped electric conduction crystallizer, slagging the premelting slag in the lined electroslagfurnace, and forming a slag tank by pouring; (2) lowering the graphite electrode ring, and causing the graphite electrode ring, the slag tank, the upper crystallizer, a casting power source and the traverse arms to form an electric conduction loop, and heating the surface of the core rod and the slag tank by electrifying; and (3) when a preset temperature reaches, moving away the graphite electrode ring, inserting the self-consuming electrode ring into the slag tank, and carrying out electroslag casting. The method has high utilization rate of heat, can prevent interlayer slag from being generated on the compound interface of the steel ingot, facilitates the improvement of the quality of the steel ingot and simplifies the production equipment.