40results about How to "Meet mechanical properties" patented technology

The invention relates to a novel nerve duct bracket and a preparation method and application thereof. Three-dimensional graphene or graphene derivative multichannel active nanofiber sponge is used asa stuffing inner core, and nanofibers in an axial direction are used as an outer pipe. The preparation method comprises the steps of performing ultrasonic dispersion on graphene or a graphene derivative into spinning liquid, performing electrostatic spinning, and performing drying so as to obtain a nanofiber film; performing shearing, and performing homogenization and crushing so as to obtain broken fiber mixed liquid; pouring the broken fiber mixed liquid into a multichannel mold, and performing freeze drying; performing cross-linked shaping; performing drying and shaping so as to obtain thethree-dimensional graphene or graphene derivative multichannel nanofiber sponge; and performing fixing in an axial direction spinning receiver, and performing axial direction spinning on an outer layer so as to obtain the novel nerve duct bracket. The novel nerve duct bracket is used for inducing repair and regeneration of nerve tissue. The novel nerve duct bracket disclosed by the invention is simple to operate and good in repeatability, and a new thinking is provided for repairing neurological deficits.

The present invention relates to a coordination deformation support system suitable for a soft-rock large-deformation tunnel, and a support method of the support system. The system comprises a tunnel primary support structure and a secondary lining; the tunnel primary support structure comprises an anchoring support structure deep into a stable rock, a first protection layer tightly attached to an inner wall of the surrounding rock, and a foam concrete filling layer positioned at an inner side of the first protection layer; the secondary lining is disposed at an inner side of the foam concrete filling layer; and the first protection layer is formed by a concrete spraying layer having the same thickness in the radial direction of the tunnel and a plurality of compressible cushion blocks. The concrete layer is separated by the compressible cushion blocks, integral flexibility of the concrete layer is largely enhanced, flexible support characteristics of a primary lining can be fully showed, fracture of the primary lining caused by large deformation of the soft rock is prevented, and integrity of the support system is good under combined effects of the foam concrete filling layer, the anchoring support structure and the secondary lining.

The invention belongs to the technical field of cold rolled steel and discloses zinc-plated double-phase steel and a production method of the zinc-plated double-phase steel. The zinc-plated double-phase steel comprises, by weight percentage, 0.085%-0.115% of C, 0.15%-0.24% of Si, 1.45%-1.55% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.025%-0.065% of Alt, 0.14%-0.24% of Cr, 0.24%-0.29% of Mo, not larger than 0.006% of N and the balance Fe and other inevitable impurities. The production method includes the steps of KR desulfuration, converter steelmaking, LF+RH refining treatment, RH calcium treatment, continuous steel casing, billet heating, rough rolling, finish rolling, laminar cooling and winding; unwinding, acid pickling, cold continuous rolling and winding; and unwinding, cleaning, annealing, zinc plating, finishing and winding. Through composition design and process control, the zinc-plated double-phase steel is suitable for annealing production lines having the rapid cooling segment or not.

The invention provides a method for preparing a conductive composite nanofiber nervous tissue engineering scaffold based on graphene. The method includes the following steps: a step 1, dissolving tussur silk fibroin and poly (lactic acid)-poly caprolactone in a solvent with stirring till complete dissolution of the tussur silk fibroin and the poly (lactic acid)-poly caprolactone so as to acquiring a spinning solution; a step 2, performing electrostatic spinning on the spinning solution obtained from the step 1 so as to acquire a nanofiber membrane, performing steam fumigation treatment by using ethyl alcohol, and performing drying so as to acquire tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofibers; and a step 3, dipping the tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofiber scaffold material obtained from the step 2 in a graphene oxide dispersion liquid, taking out the tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofiber scaffold material, cleaning the tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofiber scaffold material, soaking the tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofiber scaffold material in an ascorbic acid solution, taking out the tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofiber scaffold material, and cleaning the tussur silk fibroin / poly (lactic acid)-poly caprolactone composite nanofiber scaffold material so as to acquiring the conductive composite nanofiber nervous tissue engineering scaffold based on the graphene. The method is simple to operate, is excellent in repeatability, and can provide a new thought for nerve defect repairing.

The invention discloses a low-nickel steel plate for a pressure vessel at low temperature of -196 DEG C and a production method thereof. The steel plate comprises the following components: C less than or equal to 0.04, Si less than or equal to 0.05, Mn between 1.60 and 2.50, P less than or equal to 0.005, S less than or equal to 0.003, Alt between 0.015 and 0.050, Ni between 6.00 and 8.00, Cu between 0.35 and 0.50, Cr between 0.55 and 1.00, N less than or equal to 0.004, at least one of Mo less than or equal to 0.35, Nb less than or equal to 0.05, Ti less than or equal to 0.025 and Ca less than or equal to 0.005, and Fe and inevitable impurities as the rest. During rolling, according to different thicknesses of steel plates, heat treatment processes of secondary normalizing and tempering, quenching and tempering, secondary quenching and tempering and the like are respectively performed. The prepared low-nickel steel plate has the advantage of low cost, a feasible production process is adopted, mass production operation of a low-temperature storage tank of LNG (Liquefied Natural Gas) is facilitated, and pressure vessel steel with good low-temperature toughness, excellent impact performance and strong welding performance is obtained.

The invention discloses an intelligent control technology for cooling of a deformed-steel-bar fine-grained rolling rolled piece, and relates to the field of production of deformed steel bar. The rolling technological process includes the steps of rolling of a roughing mill-flying shear of a flying shear cutter I-rolling of an intermediate rolling mill-intelligent control over cooling of an intermediate rolled piece-flying shear of a flying shear cutter II-rolling of a finishing mill-intelligent control over cooling of a finish rolled piece-flying shear of a flying shear cutter III-cooling of acooling bed. The intelligent control process of rolled piece cooling includes the intelligent control over cooling of the intermediate rolled piece and the intelligent control over cooling of the finished rolled piece, the intelligent control over cooling of the intermediate-rolled piece is set after rolling of the intermediate rolling mill, and the intelligent control over cooling of the finished rolled piece is set after rolling of the finishing mill; the intelligent control technology is adopted to control the temperature in each process during the cooling process of the rolled piece, so that finally pearlite and ferrite structure can be obtained from the deformed steel bar without adding V alloy, the production cost is saved and the production efficiency is improved.

The invention belongs to the field of epidermal electronics, and discloses a large-area grid type epidermal electronic system for closed-loop man-machine interaction. The large-area grid type epidermal electronic system comprises epidermal myoelectricity electrode arrays, a joint rotation angle sensor array, an electric touch sensation sensor array, connecting structures and a circuit compensation structure, wherein the epidermal myoelectricity electrode arrays are used for collecting myoelectricity signals of the internal muscles and the external muscles of all fingers and the muscles of a wrist; the joint rotation angle sensor array is used for collecting the rotation angles of finger joints and the wrist; the electric touch sensation sensor array is used for stimulating fingertips through an electric current and a voltage; the circuit compensation structure is used for eliminating excess myoelectricity signals introduced by each epidermal myoelectricity electrode connecting structure, so that the accuracy of obtained signals of man-machine interaction equipment is guaranteed. Each sensor of the system is very light, thin and small, has stretchability and conforms with the mechanical property of skin, and at the same time, the problem that heat dissipation and perspiration can not normally proceed due to large-area covering is solved.

The invention discloses a stainless steel welding electrode with low magnetic permeability and a preparation method thereof. The welding electrode of the invention is composed of an H06Cr21Ni10 welding core and a coating. The coating comprises components according to the following weight percentages: 45 percent to 53 percent of TiO2, 10 percent to 13 percent of CaCO3, 10 percent to 13 percent of CaF2, 0.6 percent to 1 percent of alkali powder , 5 percent to 7 percent of quartz, 2 percent to 3 percent of talc, 6 percent to 8 percent of chromium metal, 7.5 percent to 8.5 percent of manganese metal, 2.8 percent to 3.6 percent of metallic nickel and 1 percent to 2 percent of Cr2O3. The weld metal of the welding electrode of the invention has low magnetic permeability, meets the required mechanical properties and can be used for welding stainless steel structures of 1Cr18Ni9Ti and 0Cr18Ni9 with low magnetic permeability. The price of the welding electrode is considerably lower than that of the existing stainless steel welding electrode E310-16 with low magnetic permeability. The welding electrode of the invention has welding technological properties and mechanical properties of weld metal which are similar to the existing E308-16 stainless steel welding electrode, thereby being convenient for wide application.

The invention provides a damping shock absorber which comprises an adjusting lever, a mass block, supporting block components and elastomer components, wherein the mass block is arranged outside the adjusting lever in a sleeving manner in a clearance fit manner; the supporting block components are arranged at the two ends of the adjusting lever; the elastomer components are arranged outside the adjusting lever in a sleeving manner and are arranged between the mass block and the corresponding supporting block components; the supporting block components, the elastomer components and the mass block are hermetically connected; and a gap between the mass block and the adjusting lever is filled with damping oil. The invention also provides a toobar and a tool with the damping shock absorber applied. According to the damping shock absorber, the toolbar and the tool, the vibration of the long overhanging tool in cutting is greatly reduced, efficient and stable cutting is realized, the requirements on the processing precision and the roughness of a product are met, the advantages of high stability and high precision are achieved, and particularly the tool is suitable for cutting metal underthe working condition of long overhanging processing.

The invention discloses a test device and method for simulating fractured rock secondary diagenesis. The test device is composed of an axial compression disc, a confining pressure device, a chassis and a confining pressure applicator. The method comprises putting fractured rock into the test device, applying vertical pressure to the device through a rock mechanical test system, and recording pressure valve change cases to obtain fractured rock secondary regenerated rock and to know mechanical parameters in the whole secondary diagenesis process. The device and method realize simulation of fractured rock secondary diagenesis and convenient research of mechanical parameters of the fractured rock during the secondary diagenesis, can carry out a later mechanical test on the rock subjected to secondary diagenesis, and provides the reliable theoretical basis for retaining and protecting the secondary diagenesis of the fractured rock under a mine so that the engineering practical retaining and protecting design satisfies the mechanical properties of the rock.

The invention discloses a low-nickel steel plate for a pressure vessel at low temperature of -120 DEG C and a production method thereof. The steel plate comprises the components: C less than or equal to 0.04, Si less than or equal to 0.05, Mn between 0.85 and 1.50, P less than or equal to 0.005, S less than or equal to 0.003, Alt between 0.015 and 0.050, Ni between 2.00 and 3.00, Cu between 0.35 and 0.50, Cr between 0.55 and 1.00, N less than or equal to 0.004, at least one of Mo less than or equal to 0.35, Nb less than or equal to 0.05, Ti less than or equal to 0.025 and Ca less than or equal to 0.005, and Fe and inevitable impurities as the rest. According to the low-nickel steel plate, the defect of high cost of existing steel can be overcome, a feasible production process is adopted, mass production operation is facilitated, and pressure vessel steel with good low-temperature toughness, excellent impact performance and strong welding performance is obtained.

The invention relates to a biological 3D printing skin repair stent. The biological 3D printing skin repair stent comprises epidermal layers, dermis layers and subcutaneous tissue layers which are sequentially stacked in a hydrogel form, The hydrogel is prepared from sodium alginate, gelatin, collagen, hyaluronic acid, elastin, laminin, glycerol and the like. The skin repair stent further comprises a compact layer used for water locking and barrier. The skin repair stent is subjected to biological 3D printing according to a set 3D printing skin repair stent structure, and the designed skin repair stent structure comprises 2-6 epidermis layers, 6-20 dermis layers and 6-20 subcutaneous tissue layers. The fiber directions of the adjacent layers of the 3D printing layers are orthogonally printed, and the fiber directions of the spacer layers are printed in a staggered mode. According to the skin repair stent, through different hydrogel composition ratios of all the layers, the skin structure is well simulated, and skin repair is effectively promoted.

The invention discloses a high-speed railway bridge assembly type steel plate shear wall damping device. The high-speed railway bridge assembly type steel plate shear wall damping device is characterized in that an anti-seismic support is arranged in the center of the top of a prefabricated pier column, the damping device comprises a plurality of sets of damping units evenly distributed around theanti-seismic support, and each set of damping unit comprises T-shaped bodies, horizontal energy dissipation plates, angle steel, vertical energy dissipation plates and anchoring components; the horizontal energy dissipation plates are symmetrically arranged on the inner sides of wing plates of the T-shaped bodies, angle steel is symmetrically arranged on the two sides of webs, the corners of theangle steel are located in included angles between the wing plates and the webs of the T-shaped bodies, and the two rows of anchoring components symmetrical with respect to the center face in the length direction are arranged on the outer sides of the wing plates. The wing plates of the T-shaped main bodies, the horizontal energy dissipation plates, horizontal arms of the angle steel and the anchoring components are connected through high-strength bolts and nuts to form an integral pieces; and the two sets of integrated pieces are symmetrically arranged relative to the webs of the T-shaped bodies, and after the vertical energy dissipation plates are inserted into the two sides of the webs of the two T-shaped bodies and between vertical arms of the angle steel on the two sides separately, the damping units are formed through the high-strength bolts and nuts in a connected mode.

The invention discloses a composite formwork for a building and a manufacturing method thereof. The composite formwork sequentially comprises a reinforcing structure layer (1), a grid supporting layer(2) and an inner structure layer (3) from outside to inside. The inner structure layer (3) seals the reinforcing structure layer (1) and the grid supporting layer (2) on the left side and the right side of the composite formwork for the building, and a plurality of concave-convex structures (4) capable of being spliced with one another are formed on the sealed parts on the left side and the rightside respectively. The manufacturing method comprises the following steps: 1) preparing the reinforcing structure layer (1); 2) preparing the grid supporting layer (2); 3) compounding the reinforcingstructure layer (1) and the grid supporting layer (2); and 4) preparing the inner structure layer (3). According to the formwork, the problems that in the concrete pouring process, defects are proneto occurring due to the fact that local vibration is not tight and filler is not compact are solved, the disclosed formwork is light in weight and high in strength, the service lifetime is prolonged,no release agent is used so that environmental pollution is avoided, and the manufacturing method is simple in process and low in energy consumption.

The invention discloses a personalized semi-pelvic prosthesis and a making method thereof. The personalized semi-pelvic prosthesis comprises a sacrum base, a connecting piece and a femoral joint handle, wherein the sacrum base comprises a sacrum support and a stress conduction tube; the sacrum support is L-shaped, and a through hole is formed in the center of the corner of the sacrum support; the stress conduction tube is an arc tube, and the high end of the stress conduction tube is fixedly connected inside the through hole; the connecting piece comprises a connecting arm and a joint ball head; the connecting arm is an arc arm matched with the arc tube; the joint ball head is arranged at the lower end of the connecting arm; the connecting arm is coaxially arranged in the stress conduction tube; the femoral joint handle comprises a lifting cup; and the joint ball head is spherically hinged inside the lifting cup. The inherent biomechanical properties of the original pelvis are obtained through finite element analysis by a stress conduction channel, so that the stability and reliability of connection can be improved. Through the arrangement of the joint ball head and the lifting cup, a reverse spherical lifting joint is formed, so that the work weight can be better borne, weight bearing is facilitated, the degree of freedom is larger, postoperative early-stage activities are facilitated, and the living quality of a patient is obviously improved.

The invention relates to a special material of a gas inlet cylinder of an M251S type gas turbine and a manufacturing process thereof. The material comprises the following chemical components in percentage by weight: less than or equal to 0.25 percent of C, less than or equal to 0.60 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent S, less than or equal to 0.25 percent of Cr, less than or equal to 0.25 percent of Mo, less than or equal to 0.50 percent of Ni and less than or equal to 0.50 percent Cu. The invention has the advantages of developing the material conforming to the requirement of the gas inlet cylinder of the M251S type gas turbine, casting and molding a product conforming to the mechanical properties of the gas inlet cylinder of the gas turbine and filling the material blank of the product in China and abroad.

The invention discloses a method for preparing a medical titanium alloy material through laser sintering. The method comprises the following steps: S1, surface treatment of titanium alloy powder; S2,preparing of nano silver suspension; S3, attachment of nano silver; S4, generating of three-dimensional data; S5, laser sintering additive manufacturing; and S6, surface treatment. According to the method, uniform distribution of nano silver in the medical titanium alloy material prepared through laser sintering can be realized, by changing the use amount of the titanium alloy powder with nano silver attaching to the surface and the thickness of the outline part, preparation of antibacterial layers with different thicknesses and different nano silver contents can be realized, and then the antibacterial effect of the medical titanium alloy material can be remarkably improved.

The invention relates to a novel nerve guide bracket and its preparation method and application. The three-dimensional graphene or graphene derivative multi-channel active nanofiber sponge is used as the filling inner core, and the axially oriented nanofiber is used as the outer tube. The preparation method includes: ultrasonically dispersing graphene or graphene derivatives in the spinning solution, electrospinning, and drying to obtain a nanofiber film; cutting, homogenizing and pulverizing to obtain a mixed solution of crushed fibers; pouring it into a multi-channel mold , freeze-drying; cross-linking molding; drying molding to obtain a three-dimensional graphene or graphene derivative multi-channel nanofiber sponge; fixing it on an axially oriented spinning receiver, and performing axially oriented spinning on the outer layer to obtain the final product. Used to induce the repair and regeneration of nerve tissue. The invention has simple operation and good repeatability, and provides a new idea for nerve defect repair.

The invention discloses a model similar material for simulating slope dangerous rock mass and a preparation method of the material, each raw material has unique functions, barite powder is used as a weighting material, semi-refined paraffin is used as a binder, No.32 hydraulic engine oil is used as a lubricant, and ultralight clay is used as an additive. The finally mixed similar material has the properties of high weight, low strength and low elastic modulus, and meets the mechanical properties of the dangerous rock mass under natural conditions; by changing the ratio of the raw materials, the compressive strength and the deformation modulus of the similar material can be changed under the condition of ensuring the required volume weight, and both the semi-refined paraffin and the No.32 hydraulic engine oil in the raw materials have the effect of changing the mechanical properties of the material; change of the compressive strength and the deformation modulus of the similar material in a large range can be controlled by slightly changing the ratio of the raw materials; and in the preparation process, only the raw materials need to be dried and dewatered, other steps are carried out at room temperature, the preparation process is simple, the preparation efficiency is high, and the cost is relatively low.

The invention discloses a stainless steel welding electrode with low magnetic permeability and a preparation method thereof. The welding electrode of the invention is composed of an H06Cr21Ni10 welding core and a coating. The coating comprises components according to the following weight percentages: 45 percent to 53 percent of TiO2, 10 percent to 13 percent of CaCO3, 10 percent to 13 percent of CaF2, 0.6 percent to 1 percent of alkali powder , 5 percent to 7 percent of quartz, 2 percent to 3 percent of talc, 6 percent to 8 percent of chromium metal, 7.5 percent to 8.5 percent of manganese metal, 2.8 percent to 3.6 percent of metallic nickel and 1 percent to 2 percent of Cr2O3. The weld metal of the welding electrode of the invention has low magnetic permeability, meets the required mechanical properties and can be used for welding stainless steel structures of 1Cr18Ni9Ti and 0Cr18Ni9 with low magnetic permeability. The price of the welding electrode is considerably lower than that ofthe existing stainless steel welding electrode E310-16 with low magnetic permeability. The welding electrode of the invention has welding technological properties and mechanical properties of weld metal which are similar to the existing E308-16 stainless steel welding electrode, thereby being convenient for wide application.

The invention discloses a construction method of an annular cable-supported grid structure with an upper grid participating in balancing inhaul cable pretension. The construction method comprises thefollowing construction steps of (1) mounting a column and an outer ring; (2) installing a jig frame capable of being pressed and pulled below a main grid, and arranging a horizontal sliding device onthe top of the jig frame; (3) mounting the main grid and corresponding supporting rods on the jig frame, wherein the jig frame is pressed at the moment; (4) mounting and tensioning a lower cable net,wherein the jig frame is pulled, and the top end of the jig frame horizontally slides relative to the main grid; (5) mounting cantilever grids and corresponding supporting rods; and (6) finally dismounting the jig frame after mounting a part or all of a roof system. According to the construction method, the jig frame does not need to be arranged below the overhanging grids, and ring cable spreading and lifting installation are facilitated; the jig frame capable of being pressed and pulled is arranged to maintain the elevation of the main grid when an inhaul cable is tensioned, and the mountingprecision of the cantilever grids is controlled; and the construction method conforms to the mechanical property of the cable-supported grid structure with the upper grid participating in balancing inhaul cable pretension, and efficient and high-precision construction forming is facilitated.

The present invention relates to an experimental device for simulating the uneven settlement of buildings in a goaf and a method for using it, including a vibrating table, H-shaped steel, an applying device, a connecting device, an encrypted steel bar component, a limit component, a data acquisition system and a vibration system, and a vibrating H-shaped steel is fixedly installed on the upper surface of the top plate on the platform. The inventive device uses a shaking table to analyze the coupling effect of earthquake and mining subsidence deformation on buildings; adjusts the height of the coal mine mining action application device, and realizes the simulation of mining subsidence deformation through the concrete frame models of four different working conditions in the laboratory. Then input the seismic wave through the shaking table, analyze the anti-seismic-anti-mining subsidence deformation performance of the model, especially the application in the cracking analysis simulation experiment of the anti-seismic performance of buildings in the mining area, and solve the problem of the gap between the coal mining action application device and the concrete pillar The material properties are quite different, and welding cannot be performed, and the coal mining action application device cannot be reused.

The invention discloses a tunnel initial support design method based on a safety factor method, and belongs to the field of tunnel engineering. By calculating surrounding rock pressure of shotcrete-bolt support, and combining a design function of a shotcrete-bolt support structure (i.e., a main bearing body or a temporary support), tunnel characteristics, construction quality, engineering importance and other factors, a total safety factor of the shotcrete-bolt support structure is determined, and a safety factor of a combined arch structure composed of a spray layer, a bolt and surrounding rock is also determined; and then the total safety factor of the shotcrete-bolt support structure is assigned to the corresponding spray layers and the corresponding bolts, thereby calculating the parameters of the spray layers and the bolts, and completing parameter design of the tunnel initial support structure. The tunnel initial support design method based on the safety factor method can providea reasonable and effective method for component selection and quantitative design of the tunnel initial support structure, avoids blindness and randomness of a traditional design method, steps are simple and convenient, implementation is convenient, and the promotion prospects are broad.

The invention discloses a high-speed railway bridge assembly-type steel plate shear wall damping device. An anti-seismic support is arranged at the center of the top of a prefabricated pier column. Each group of damping units includes a T-shaped main body, horizontal energy-dissipating plates, angle steels, vertical energy-dissipating plates, and anchoring components; horizontal energy-dissipating plates are arranged symmetrically on the inner side of the wing plates of the T-shaped main body, angle steels are symmetrically arranged on both sides of the web, and angle steels are arranged symmetrically on both sides of the web. The corner is located in the angle between the wing plate and the web of the T-shaped main body, and two rows of anchoring members are arranged on the outer side of the wing plate symmetrically about the center plane in the length direction; the wing plate of the T-shaped main body, the horizontal energy dissipation plate, the angle The horizontal arm and the anchor member are connected by high-strength bolts and nuts to form an integral part; the two sets of integral parts are relatively symmetrically arranged on the web of the T-shaped main body, and on both sides of the web of the two T-shaped main bodies and the angle steel on both sides Vertical energy-dissipating plates are respectively inserted between the vertical arms and connected by high-strength bolts and nuts to form a shock-absorbing unit.

The invention relates to a self-balancing multi-stage pump four-volute-chamber water outlet structure. The self-balancing multi-stage pump four-volute-chamber water outlet structure comprises a pump body; a main shaft is arranged in the center of the pump body; a positive impeller and a final-stage positive impeller are installed on the left side of the main shaft; a negative impeller and a final-stage negative impeller are installed on the right side of the main shaft; a water outlet section is arranged in the middle of the pump body and provided with four volute chambers; the positive impeller and the final-stage positive impeller are symmetrically arranged in the two volute chambers on the left side of the water outlet section; the final-stage negative impeller and the negative impeller are symmetrically arranged in the two volute chambers on the right side of the water outlet section; a positive guide vane is installed on the left side of the water outlet section; a negative guide vane is installed on the right side of the water outlet section; the first volute chamber and the third volute chamber are both round volute chambers; the second volute chamber is a spiral volute chamber; and the fourth volute chamber is a spiral parabolic volute chamber. Through the unique structural design, the efficiency of a pump is improved, noise is lowered, and the service life of the pump is prolonged.

The invention discloses an intelligent control technology for cooling of a deformed-steel-bar fine-grained rolling rolled piece, and relates to the field of production of deformed steel bar. The rolling technological process includes the steps of rolling of a roughing mill-flying shear of a flying shear cutter I-rolling of an intermediate rolling mill-intelligent control over cooling of an intermediate rolled piece-flying shear of a flying shear cutter II-rolling of a finishing mill-intelligent control over cooling of a finish rolled piece-flying shear of a flying shear cutter III-cooling of acooling bed. The intelligent control process of rolled piece cooling includes the intelligent control over cooling of the intermediate rolled piece and the intelligent control over cooling of the finished rolled piece, the intelligent control over cooling of the intermediate-rolled piece is set after rolling of the intermediate rolling mill, and the intelligent control over cooling of the finished rolled piece is set after rolling of the finishing mill; the intelligent control technology is adopted to control the temperature in each process during the cooling process of the rolled piece, so that finally pearlite and ferrite structure can be obtained from the deformed steel bar without adding V alloy, the production cost is saved and the production efficiency is improved.

The present invention is an experimental device for simulating coal mining and its application method, which includes a vibrating table, H-shaped steel, an applying device, a connecting device, an encrypted steel bar assembly and a limit assembly, and the upper surface of the top plate on the vibrating table is fixedly installed with For H-shaped steel, an application device is provided on the upper surface of the upper flange of the H-shaped steel, and the application device is specifically a jack. The inventive device is firmly combined by adding steel plates and using extended bolts, which avoids the relative displacement between the concrete frame column and the coal mining action application device, and then realizes the firm combination of the coal mine mining action application device and the base H-shaped steel. Simulate the fixed end constraints in the real working conditions, and then simulate the different working conditions of the building settlement during the coal mining process, and solve the problem that the material properties between the coal mining action application device and the concrete column are quite different, and welding cannot be performed. Problems with reusing coal mining action applicators.

The invention relates to a crawler crane anti-tipping device and belongs to the technical field of crane safety. The anti-tipping device manly comprises a front-mounted telescopic arm, a limiting supporting rod, an anti-tipping steel wire rope with calculated length and strength, a pulley, a steel wire rope winch and the like. When a crawler crane works by small amount, one end of the steel wire rope is fixed at the head of an auxiliary arm, and the other end of the steel wire rope is fixed at the head of the front-mounted telescopic arm on a slewing platform and is pretightened with the steelwire rope winch after penetrating through the pulley on a limiting supporting rod at the head of a main arm. When the crawler crane performs hoisting operation by small amount and encounters backwardwind or suddenly performs unloading to cause backward bouncing of an arm frame, the device performs forward traction on the head of the arm frame to counteract the backward bouncing load of the head,and the effect of stress protection to the arm frame and avoidance of whole machine tipping are exerted. When the crawler crane performs dramatic operation or in a non working state, the steel wire rope winch releases the steel wire rope, the supporting rod and the front-mounted telescopic arm are retracted to the position close to the arm frame, and the device does not work and does not influence operation of the crane.