109results about How to "Guaranteed Design Requirements" patented technology

The invention discloses a preliminary bracing construction method for a tunnel with surrounding rocks containing collapsible loess and soft rocks. The method includes the following steps that a plurality of layers of advanced pipe sheds are arranged on a collapsible loess layer, and a single layer of advanced pipe shed is arranged on a soft rock layer; after the advanced pipe shed is set up, a working face is closed through sprayed concrete, a system anchor bolt is arranged on the soft rock layer, a foot locking small guide pipe is arranged at the arch springing position of the tunnel, and grouting is conducted on the rocks through permeation of the system anchor bolt and the foot locking small guide pipe; a pre-fabricated reinforcing mesh is paved on a concrete initial spraying layer formed by concrete initial spraying in a fluctuation mode, and a reinforcing mesh arranged at the collapsible loess layer is encrypted; a steel arch support is set on the collapsible loess layer, a reinforcing steel bar grid is set up at the soft rock layer, and the connecting position of the reinforcing steel bar grid and the steel arch support is welded; repeated spraying is conducted by adopting concrete spraying, and construction of tunnel preliminary bracing is finished. By means of the method, stress releasing and deformation coordination of two layers of surrounding rocks can be well controlled, operability is good, construction cost is low, and the safety is good.

The invention relates to a flexibility-regulable epoxy resin adhesive, which consists of component A and component B; the component A consists of the following materials in percentage by weight: 30 to 60 percent of toughened epoxy resin, 1 to 5 percent of thinning agent, 30 to 60 percent of filler, 0 to 1 percent of silane active coupling agent, 0 to 1 percent of dye, 1 to 10 percent of toughener and 0 to 1 percent of defoaming agent; and the component B consists of the following materials in percentage by weight: 40 to 99 percent of curing agent, 0 to 60 percent of filler, 0 to 1 percent of dye, 0 to 10 percent of toughener and 0 to 1 percent of defoaming agent. The invention solves the problems of cured epoxy resin, i.e. high brittleness and weak impact resistance, the modulus is not lost on the basis of toughening, moreover, the bonding reliability of the cured system is high, and the application range is wide.

The invention discloses a flame tube head assembly brazing method and belongs to the technical field of aero-engine part manufacturing. In a brazing method of a traditional flame tube head assembly, an assembly substrate at a positioning welding point is oxidized due to the fact that a tube front section and a splash pan are positioned through argon arc welding, so that during brazing, brazing filter metal cannot moisten the substrate at the positioning welding point, the brazing seam is not continuous, and a design requirement of a continuous brazing seam cannot be achieved, and after brazing, a cold air hole is blocked by the brazing filter metal, the brazed rate between a sleeve and a swirler cannot achieve a design requirement of more than 80%. The flame tube head assembly brazing method has the advantages that the assembly substrate at the positioning welding point is avoided from being oxidized due to positioning through energy storage spot welding, enabling the paste brazing filter metal to moisten the substrate at the positioning welding point and guaranteeing the continuous brazing seam design requirement; enabling a to-be-welded position on the internal side of the sleeve to satisfy the brazed rate requirement and avoiding the brazing filter metal blocking the cold air hole during the brazing process due to the fact that check soldering flux pains inside the cold air hole; the operability is strong and production costs are obviously reduced.

The invention discloses a machining process for low-pressure first-stage stationary blades of gas turbines, which belongs to the technical field of blade machining. The machining process for low-pressure first-stage stationary blades of gas turbines includes: step 1: a Z-shaped blade blank is formed by wire cutting; step 2: auxiliary heads are respectively welded on the inner and outer rings of the blade; step 3: rough machining is carried out; step 4: semifinishing is carried out; step 5: four times of finish machining are carried out on the air passage part, and finish machining is carried out on the radial face of the blade; step 6: the wire cutting method is adopted to remove the auxiliary heads of the outer and inner rings, and the inner ring surface, the outer ring surface and the inner radial surface of the blade are then machined. Under the premise of guaranteeing product design requirements and assembly quality, the machining process for low-pressure first-stage stationary blades of gas turbines strive for strict process control, a complete machining process, simple machining operation, integrated difficult point machining and critical control on key factors, thus effectively guaranteeing the quality of products and increasing the production efficiency.

The invention discloses a construction method for the midspan closure segment of a longspan continuous rigid frame bridge, which is characterized by comprising the following steps: (a) adopting a hanging basket cantilever pouring method, and constructing a cantilever beam section in front of the closure segment; (b) disassembling the hanging basket, manufacturing components disassembled from the hanging basket into a cradle, and installing the cradle on the two beam sections of the midspan closure; (c) carrying out equivalent counterweight; and (d) supporting the beam. The traditional hanging basket is utilized in the closure process instead of manufacturing the cradle again. After the traditional hanging basket system is disassembled and combined again, the closure cradle is formed, thereby guaranteeing the design requirement, improving the working efficiency and saving fund. The construction method for the midspan closure segment is suitable for constructing of the same type of suspended irrigation closure. The traditional hanging basket is modified without additionally adding the cradle, the self weight is lightened, and the problem that the upper limit requirement of the total amount of the additional loading amount of the closure segment is exceeded if the hanging basket is directly used for closure.

The invention provides a machining method of a wave spring. A strip the same as a finished wave spring in thickness, length and width is obtained, a remelting layer of the strip is polished out through crocus paper, and a planar wave spring blank is made; the wave spring blank is fixed in a tool at room temperature and is subjected to cooling sizing; vacuum sizing processing is conducted, wherein hot sizing processing is conducted in an aging sizing mode, a clamp is detached, then the part shape is reserved, and forming processing of the spring is completed; the part is preformed through the fixing function of technological equipment, then elastic deformation stress is eliminated through aging hot processing, and the accurate machining shape of the part is reserved. It is ensured that the geometrical size and waveform of the wave spring meet the design requirements; the machining problem of strip-shaped wave springs is solved; it is ensured that the spring meets the design requirements.

Belonging to the technical field of suspension steel plate springs, the invention relates to a checking computation method for the composite stiffness of non-end contact type few-leaf parabolic main and auxiliary spring. According to the structural parameter and elastic modulus of each main spring leaf and each auxiliary spring leaf in the non-end contact type few-leaf parabolic tapered main and auxiliary spring, precise checking computation of the composite stiffness of the non-end contact type few-leaf parabolic tapered main and auxiliary spring carried out. By means of examples and ANSYS simulation verification, the checking computation method for composite stiffness of the non-end contact type few-leaf parabolic tapered main and auxiliary spring provided by the invention is correct, thus providing a reliable checking computation method for composite stiffness checking computation. The method can acquire an accurate and reliable composite stiffness checking calculation value of the non-end contact type few-leaf parabolic tapered main and auxiliary spring, ensures that the product can meet a design required value of a suspension for composite stiffness, thus enhancing the product design level and performance and vehicle travel riding comfort. At the same time, the method also can reduce the design and experiment test cost, and speeds up product development rate.

The invention relates to a polyester/recycled cotton/colored flax blended knitting yarn. The polyester/recycled cotton/color jute blended knitting yarn is produced from raw materials, namely dyed flax fibers (colored flax), recycled fibers (recycled cotton of rotor spinning) and polyester short fibers, by virtue of a cotton spinning production process. The characteristics of the three types of fibers are thoroughly developed in the blended knitting yarn; the formed clothing fabric is concave-convex, blinking, novel in style, hygroscopic and air permeable, antibacterial and bacteriostatic and fashionable to wear, and thus is an ideal fabric to produce various fashion clothes; the yarn produced by use of the structure of the three raw materials fills in the domestic gaps. The production processes of various steps are optimized, the technical problems such as poor fineness, high rigidity, no natural crimp, poor cohesive force between fibers and poor length uniformity of the flax fibers, many flock impurities and poor spinnability of the rotor spinning recycled cotton, and the influence caused by difficult control of the blending ratio and the color of the three types of fibers on the yarn forming quality and the style of the yarn are solved; the technique is mature and at the advanced level domestically.

The invention relates to a self-triggering voltage setting method of a spark gap of a 500kV series compensation system. The spark gap of the series compensation system structurally comprises a self-triggering main gap device G1, a self-triggering main gap device G2, a sealing gap device TRIG1, a sealing gap device TRIG2, a current limiting resistor R1, a current limiting resistor R2, a pulse transformer T1, a pulse transformer T3, a high-insulation pulse transformer T2, a high-insulation pulse transformer T4, a voltage-sharing capacitor C1, a voltage-sharing capacitor C2, a voltage-sharing capacitor C3 and a voltage-sharing capacitor C4. The self-triggering voltage setting method of the spark gap of the series compensation system includes the steps that the single flashover gap distance of the main gap device G1 and the single flashover gap distance of the main gap device G2 are adjusted according to 1.8p.u. series compensation rated voltages, and the flashover gap self-triggering voltages are made to be higher than the sum of the self-triggering voltages of two triggering gaps on a parallel branch. By means of the self-triggering voltage setting method of the spark gap of the 500kV series compensation system, self-triggering of the spark gap in the operating process of the series compensation system can be effectively reduced, the problem of self-triggering voltage reduction caused by dirt accumulation on the surface of a hemispherical flashover gap graphite electrode is solved, and thus the self-protection function of the self-triggering voltages of the series connection spark gap can be achieved.

The invention relates to a specially-shaped body annular groove machining mechanism, which is characterized in that a vertical plate is connected with a soleplate into a whole, the vertical plate is provided with a connecting bolt which is in fitting connection with a numerical-control lathe rotary main shaft chuck to be locked; a specially-shaped body to be machined is tightened onto the soleplate through a tightening screw and a hexagonal nut, and the soleplate is provided with a positioning key which enables the specially-shaped body to be machined to rotate concentrically with the numerical-control lathe rotary main shaft; and a pressure plate is installed on the upper part of the vertical plate, the front end of the pressure plate is provided with a pressure block for compressing the specially-shaped body to be machined through a compression screw, the pressure block can be compressed onto the specially-shaped body to be machined by screwing the compression screw, and the compression screw is provided with a locking nut. A machined part of the specially-shaped body can be rotated through rapid installation, clamping and positioning, and an ordinary tool is used for cutting a hole and an annular groove to be machined of the specially-shaped body, so that the auxiliary time is reduced, the machining efficiency is improved, and the investment cost of the equipment and forming tool can be greatly reduced.

The invention discloses a machining method of two-section drive bridge space ring for a heavy automobile, belonging to automobile fitting technique field. At first, determining required apparatus and model drawing for machining; based on the apparatus for machining, designing positioning fixtures of each procedure and required special tool; rough turning a front end face (4) and a half outer circle B(2) by a digital control lathes; rough turning a back end face (4) and a half outer circle A(1) by a digital control lathes; heat treating the workpiece outer circle, high frequency quench treating surface; turning groove by a lathe and chamfering edges; fine turning a middle inner plane D(5), an inner plane G(6) and an inner hole (7) by the digital control lathes and the special tool; machining the outer circle by the grinder. Using parts produced by the invention can reduce friction force, with high sealing performance, and while with less oil consume and conservation of energy; the invention has advantages of high production efficiency and quality guarantee and low cost.

The invention provides a steam sealing structure for steam turbines. The steam sealing structure for steam turbines comprises a peripheral T-shaped slot, a steam sealing strip, a packing strip and a locking strip, wherein the steam sealing strip and the locking strip are arranged in a longitudinal clamping slot of the peripheral T-shaped slot, a first transverse elbow is clamped in a first transverse clamp slot, and a second transverse elbow is clamped in a second transverse clamp slot; and the packing strip is arranged between the steam sealing strip and the locking strip, the lower end of the locking strip is formed into a bent edge, and the bent edge is pressed on the lower surface of the packing strip. According to the steam sealing structure for steam turbines, the packing strip is arranged between the steam sealing strip and the locking strip, and through the packing strip, the steam sealing strip can be tensioned and tightly clamped in the peripheral T-shaped slot in the axial direction; and meanwhile, the bent edge formed at the lower end of the locking strip is pressed on the lower surface of the packing strip, so that the packing strip can be tightly compressed in the radial direction, in such a way, the steam sealing strip can be tightly fixed in the peripheral T-shaped slot, therefore, the occurrence of moving of the steam sealing strip can be effectively prevented, the assembling quality of the steam sealing strip can be ensured, and the operating stability and reliability of a steam turbine can be effectively improved.

The invention relates to a T-shaped section profile for an aluminum alloy template and a unit template structure of the aluminum alloy template. The T-shaped section profile is an integrally-molded aluminum alloy profiled plate and is composed of a groove body and a group of longitudinal reinforcing ribs, wherein the groove body is formed by a rectangular panel and two opposite longitudinal side frames on the back of the panel, and the longitudinal reinforcing ribs are uniformly distributed at the groove bottom of the groove body. The unit template structure comprises the T-shaped section profile of the aluminum alloy template, a transverse side frame, transverse reinforcing ribs and angle reinforcing blocks. The T-shaped section profile has the advantages of being definite in structure and simple in molding, little post processing of the template is required, the processing cost is reduced, and the light weight, safety in use and long service life of the template can be ensured; the construction efficiency is improved, and the standardized and systemized, industrialized production is easier; thus, the template has the advantages of being quick and convenient in disassembly and assembly, firm in mounting, high in construction efficiency and low in construction cost.

The invention discloses a method for processing titanium alloy sealing deep cavity threads. The specific processing content is the sealing deep cavity threads of a titanium alloy fan shaft; a special lathing tool is used to process the titanium alloy sealing deep cavity threads and is formed by a toolbar and a blade (4), wherein the toolbar is specifically formed by a toolbar body (1), a processing cutting board (2) and a processing cutting board slideway (3); the specific requirements of the method for processing titanium alloy sealing deep cavity threads are that the tool only enters from a large end to process, a small diameter is firstly lathed, a hollow knife slot is then lathed, and the threads are lathed; and the processing parameter requirements are that the feed rate f is equal to 1.5mm/r, the rotating speed s is equal to 150-200 r, and the lathing depth ap is equal to 0.1-0.2mm. By the method, the cutting vibration can be effectively controlled, so that the technical bottleneck that a titanium alloy sealing deep cavity threaded cutter vibrates, cannot be observed and thus is difficult to process are broken through. The method has profound significance and inestimable economic benefit.

The invention relates to an excavator base with an embedded auxiliary fuel tank. A central cylinder is arranged outside a central hole of the base; a closed cavity, namely the auxiliary fuel tank, is formed at the periphery of the central cylinder; the front part and the rear part of each side of a rear baffle plate of the fuel tank are respectively provided with a hole; the four holes are fuel pipe channels; each fuel pipe channel penetrates through the inner part and the outer part of the base and is communicated with a central hole in the central cylinder; and four fuel tank inner ribbed plates are distributed in the auxiliary fuel tank, so that the auxiliary fuel tank is divided into four small fuel tanks. The auxiliary fuel tank is added to the base, so that the independent and continuous working efficiency of an excavator is greatly improved; due to the design of the base, the gravity center of the excavator is lowered; the requirement of the excavator working under complicated terrain environment is met; and box-type structures are arranged on two sides of the base, so that the structural strength of the base is guaranteed, and the weight of the base is reduced.

The present invention discloses a multi-path parallel optical assembly packaging structure and a multi-path parallel optical assembly having the packaging structure. The packaging structure comprisesa top plate, an intermediate shell and a bottom plate, the intermediate shell comprises an annular frame and a tail tube, the annular frame is used to form an airtight cavity with the top plate and the bottom plate, and the tail tube and the annular frame are molded integrally and are communicated with the airtight cavity. The bottom plate comprises a substrate and a metal plate, the substrate isequipped with an internal wiring terminal located inside the airtight cavity, a chip loading hole and an external wiring terminal located outside the airtight cavity, and the metal plate is soldered on the bottom surface of the substrate and seals the chip loading hole, wherein after an optical joint at one end of a multi-path parallel optical fiber ribbon penetrates the tail tube and enters the annular frame, the tail tube and the multi-path parallel optical fiber ribbon are sealed via the solders. According to the present invention, via the airtight cavity, the key components are sealed effectively, by a mode that the tail tube is sealed by the solders, the large scale of a product is avoided while the optical signals are transmitted reliably, and the market demands are conducive to being satisfied.

The invention relates to a dam concrete cabin surface water accumulation hidden pipe discharge method. A water discharge main pipe is arranged in a preset region and is communicated with the upstream and the downstream of a dam, water discharge branch pipes are introduced to the left side and the right side of the dam body of the dam from the water discharge main pipe and are communicated with each dam block in a region, and a vertical water discharge branch pipe is connected onto the water discharge branch pipes of each dam block and is communicated with each concrete cabin position in each dam block. The dam concrete cabin surface water accumulation hidden pipe discharge method is characterized in that in the dam concrete casting construction process, the pre-buried water discharge pipenetwork continuously extends and expands to all concrete casting dam blocks along with the dam body concrete casting progress, each newly cast concrete cabin position in the dam region is fully covered, the water discharge problem of large-area accumulated water of the dam concrete cabin surface is solved, a dry ground construction environment condition is created for the concrete casting, the concrete casting quality is ensured, the construction interference is reduced, and the engineering civilization construction is realized.