56results about How to "Reduced creep deformation" patented technology

The invention discloses a method of a beside-pillar double-side total-filling ascending re-mining overhead coal seam. In the invention, on the basis of determining overhead coal seam mining feasibility and detecting distribution situations of a coal pillar group and a mined area group of a reamer-pillar remnant mining area, a beside-pillar double-side total-filling method is employed for successively side-protecting the coal pillar group in the underlie reamer-pillar remnant mining area of the overhead coal seam and gradually mining the overhead coal resources. By means of the method, a beside-pillar double-side filling body formed in the mined area group can not only achieve a side-protecting effect on the reamer-pillar coal pillar group but also form a common bearing body therewith, thereby further reducing degree of stress concentration and creep deformation of the coal pillar group. The method can enhance long-term stability, can avoid local instantaneous unstability or domino-like unstable damage and finally can ensure safe mining of the overhead coal seam of the reamer-pillar remnant mining area.

The invention discloses a method for pillar adjacency single side partial filling of an ascending re-mining hollow coal seam. Based on discrimination of hollow coal seam ascending mining feasibility and ascertaining of distribution statuses of a knife-pillar type residual mining area coal pillar group and a knife-pillar type residual mining area empty area group, the method for pillar adjacency single side partial filling comprises that the hollow coal seam underlying knife-pillar type residual mining area coal pillar group is successively laterally protected, and hollow coal resources are gradually mined. A pillar adjacency single side partial filling body formed in the empty area group not only can play a role in laterally protecting the knife-pillar type coal pillar group, but also can form a common supporting body with the coal pillar group, so as to reduce the stress concentration degree and creep deformation of the coal pillar group, enhance the long-term stability, avoid occurrence of local instantaneous instability or 'domino' type instability damage, and ultimately ensure safe mining of a knife-pillar type residual mining area overlying hollow coal seam.

The invention discloses a lead-free welding materials alloy which consists of silver, copper, tin and mixed rare earth Re, and the weight percentage of the composition is: Ag 3 ~ 8%, Cu 0.1 ~ 1.0%, mixed rare earth Re 0.01 ~ 0. 5% and cushion is Sn. The invention also discloses the preparation method of said lead-free welding materials alloy. The lead-free welding materials alloy in the invention can be widely used in welding materials of various circuit boards, components and assembly production line. The lead-free welding materials alloy in the invention has excellent rollout performance, low melting point but high environmental protection, and does not generate low melting point eutectic composition; it is conducive to forming reliable welding joints in welding process.

Shrinkage-reducing anti-cracking pavement cement concrete and a preparing method thereof are disclosed. The cement concrete is prepared from water, cement, fly ash, basalt fibers, light aggregate, broken stone, sand and a water reducing agent in a mass ratio of (180-200):(400-410):(40-50):(2.65-5.3):(229-286):(465-559):(830-850):(4.1-4.5). The light aggregate is uniformly dispersed in the concrete, the concrete is not liable to crack, adhesive force between the fibers and cement slurry is high, microcrack development is slow, and the concrete has high fatigue resistance and tension resistance.

The invention discloses a method of a beside-pillar double-side partial-filling ascending re-mining overhead coal seam. In the invention, on the basis of determining overhead coal seam mining feasibility and detecting distribution situations of a coal pillar group and a mined area group of a reamer-pillar remnant mining area, a beside-pillar double-side partial-filling method is employed for successively side-protecting the coal pillar group in the underlie reamer-pillar remnant mining area of the overhead coal seam and gradually mining the overhead coal resources. By means of the method, a beside-pillar double-side filling body formed in the mined area group can not only achieve a side-protecting effect on the reamer-pillar coal pillar group but also form a common bearing body therewith, thereby further reducing degree of stress concentration and creep deformation of the coal pillar group. The method can enhance long-term stability, can avoid local instantaneous unstability or domino-like unstable damage and finally can ensure safe mining of the overhead coal seam of the reamer-pillar remnant mining area.

The invention provides a preparation method of a cylindrical box body with the antifouling property for a deep and open sea net cage. The method comprises the following steps of A, preparing an antifouling netting, which comprises three aspects of preparing a modified high-density polyethylene composite material, preparing an antifouling monofilament bundle and processing the antifouling netting;B, preparing an anti-abrasion netting from a polyamide netting coated with a polyurea coating; and C, preparing the cylindrical box body, which comprises three aspects of side net processing, bottom net processing and cylindrical box body processing. According to the cylindrical box body with the antifouling property for the deep and open sea net cage obtained by the preparation method, the antifouling property of the cylindrical box body can be greatly improved and the water resistance of the cylindrical box body and the attachment area of fouling organisms can be reduced on the premise of keeping the netting strength of a side net unchanged, fouling organism attachment of the cylindrical box body and net breaking fish escape accidents under severe sea conditions can be greatly reduced, and green development and modern construction of the deep and open sea net cage culture industry are realized.

The invention discloses a method for performing ascending re-mining on a hollow coal bed by a column with one completely-filled side. On the basis that the feasibility of ascending mining on a hollow coal bed is evaluated and the distribution of coal pillars and mined area in a pillar type mined area has been explored, a method by completely filling the single side of a column is carried out to protect the coal pillars in the pillar type mined area under the hollow coal bed, and thus the coal can be exploited gradually. The fillers, which are formed in the mined area and are near the columns, can protect the coal pillars and bear force together with the coal pillars, thus the stress concentration and creep deformation of the coal pillars are reduced, the stability of the coal pillars in the long term is enhanced, the local and instant disability is avoided or the domino-type destruction caused by disability is avoided, and thus the safe exploitation is guaranteed.

A technology for preparing concrete beam includes such steps as providing shuttering boards, binding reinforcing bars, arranging prestressing corrugated pipe and twisted steel wires, pouring concrete, stretching, grouting, sealing anchor, ageing, stretching for external prestressing, grouting, sealing anchor, precise locating, and installing track or other functional parts.

A fluid ejecting apparatus includes an ejection head having an ejection surface with a nozzle region and a capping device that contacts the ejection surface. The capping device includes first and second contact members held by a cap body. When the first contact member contacts the ejection surface, a surface of the first contact member surrounds the nozzle region. The second contact member is formed in a closed frame-shape to be disposed outside a surface of the first contact member opposite the surface of the first contact member. The cap body includes first and second suction ports. The first suction port decompresses a first space formed between the first contact member and the ejection surface when the capping device contacts the ejection head. The second suction port decompresses a second space formed between the second contact member and the ejection surface when the capping device contacts the ejection head.

The invention relates to an electric spindle design adopting an aerostatic pressure anti-thrust and an aerostatic pressure radial bearing support. According to the outline dimension limit and the stiffness requirement of the electric spindle, the front end inside a shell (5) of the electric spindle is centrally provided with two aerostatic pressure anti-thrust bearings (1), thus leading the space utilization to be optimized and the structure to be compact, and at the same time the two aerostatic pressure anti-thrust bearings lead a supply air line convenient to centralize and install and provides the needed radial stiffness for a rotor-rotating shaft integrated shaft system (3). The two sides of a stator (4) are symmetrically provided with an aerostatic pressure radial bearing (2) so as to support the rotor-rotating shaft integrated shaft system, reduce the vibration of the shaft system (3) and ensure the radial stiffness. The rotor-rotating shaft integrated shaft system makes the squirrel-cage bar of the rotor of the electric motor and the rotating shaft into the integrated structure and the corresponding position of the stator arranged in the middle section and the shell of the electric spindle, that is the position of the squirrel-cage bar, adopts copper alloys directly welded in a groove of the integrated shaft system so as to reduce the creep deformation of the squirrel-cage bar, reduce the vibration value of the integrated shaft system and improve the power rate and the structural strength.

The invention provides a military full steel tubeless radial tire, and belongs to the field of a tire. Through matching noise reduction patterns with the ultrahigh-intensity framework, the sub opening support performance is improved. By aiming at the condition that the military tire can effectively reduce the tire rolling noise, the bearing performance, the tire crown rigidity, the sub opening support performance, the wear-resistant performance and the safety performance of the tire can be improved. A tire surface (1) of the military full steel tubeless radial tire comprises a tire crown (11) with noise reduction patterns and a tire shoulder (12) connected with the tire crown (11); the noise reduction patterns comprise peripheral distribution variable-pitch transverse pattern grooves (111); a plurality of bulges (113) are formed in the bottom of the transverse pattern grooves (111); support bulges (51) are arranged in the peripheral direction of the position, near a sub opening (6), of the tire side (5).

The invention discloses explosive modified by grafting in-situ hyperbranched polyurethane as well as a preparation method and application of the explosive. The preparation method comprises the following steps: (1) adding explosive into a Tris deionized water buffering solution, stirring and dispersing; (2) adding dopamine, uniformly stirring, carrying out a self-polymerization reaction of dopamineon the surface of the explosive, washing by using deionized water after the reaction is completed, carrying out suction filtration and vacuum drying to obtain the pre-modified explosive with dopaminepolymerized on the surface; and (3) adding the pre-modified explosive into butyl acetate, dispersing, increasing temperature, adding A2 type monomers and dibutyltin dilaurate, reacting, then washingby using butyl acetate, carrying out suction filtration, then transferring the explosive to a second solvent, dropwise adding dibutyltin dilaurate, gradually adding a monomer mixture and reacting, washing for four times after the reaction is completed, carrying out suction filtration, and drying to obtain the explosive modified by grafting in-situ hyperbranched polyurethane. The method improves the property of the surface of the explosive and enhances bonding strength between a bonding agent and an explosive interface.

The engineering structure lead pin viscoelastic damper is a kind of anti-seismic and shock-absorbing device used in civil engineering, especially a device suitable for indoor and outdoor, and suitable for protecting engineering structures during large and small earthquakes. The damper is a secondary stress type damper, which is composed of a middle steel plate 1, two side steel plates 2, a damping layer 3 that is stressed in the second stage, and a lead pin 4 that is stressed in the first stage. The damping layers are respectively bonded on the sides of the damping layer, and the steel plates on both sides are respectively bonded on the outer sides of the damping layer. Lead pin holes are respectively set on the middle steel plate, the steel plates on both sides and the damping layer, and the lead pins are passed through the lead pin holes. The steel plate, the steel plates on both sides, and the damping layer are connected as a whole; the shear force on the lead pin is divided into two stages. When the shear force is not too large, it is the first stage. When reaching the lead pin layer section, it enters the second stress stage, at this time, the shear force borne by the lead pin no longer increases and is a constant value, and the remaining shear force is all borne by the damping layer.

A gas turbine engine having a combustor, turbine and transition duct to channel hot gas from combustor to turbine. The transition duct has an internal surface on which the hot gas impinges causing a varying temperature profile. A thermal barrier coating is located on the internal surface having a first and second thermal barrier coating patch. The first patch having a first thickness located on the internal surface and within a first area subject to a higher temperature than an uncoated part and bounded by a first isotherm of a first temperature. The second patch having a second thickness located on the internal surface and within a second area subject to a higher temperature than the uncoated part and bounded by a second isotherm of a second temperature. The second temperature is higher than the first temperature and the second thickness is thicker than the first thickness.

The invention provides green low-creep concrete, which is prepared from the following components in parts by weight: 340 to 385 parts of cement, 45 to 56 parts of waterworks sludge powder, 45 to 48 parts of white corundum powder, 622 to 652 parts of river sand, 69 to 72 parts of fine ceramic microbead aggregate, 1036 to 1087 parts of gravel, 136 to 192 parts of water and 4.5 to 4.8 parts of a water reducing agent. The green low-creep concrete provided by the invention is beneficial to harmless treatment of sludge, and also can reduce the consumption of resources such as cement and natural river sand.