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The invention discloses a torsion type reciprocating extrusion device and a process method thereof, belonging to the technical field of plastic formation. The device comprises a cavity die, a cavity die cover plate and a cavity die fixing plate, wherein the cavity die fixing plate is fixed on a work table, and the cavity die with a variable section spindle structure is arranged between the cavitydie fixing plate and the cavity die cover plate. The process method makes materials generate the compound formation of reciprocating extrusion and torsion shearing so as to prepare ultra-fine grainedmaterials with larger volume and uniform tissue.

The invention discloses an electromagnetic valve, which comprises a valve seat, a valve port on the valve seat, an inlet pipe and an outlet pipe that are fixed through the valve seat, a sleeve connected with the valve seat as a whole, a moving iron core and a static iron core in the sleeve, a spring between the moving iron core and the static iron core, and a sealing element that is integrated with the moving iron core through a connecting part. The sealing element comprises: a sealing part right opposite to the outlet pipe, a filter element, a first holding part that faces to a chamber on the sealing element and is used for placing the filter element, an erasure part at an end part and a second holding part that is right opposite to the outlet pipe on the sealing part of the sealing element and used for placing the erasure part at the end part. Under the closed condition of the electromagnetic valve, the inlet pipe and the outlet pipe form an access through the sealing element and the access at least comprises the filter element, a first throttle access, a middle erasure part, a second throttle access, the erasure part at the end part and a spacer with a through hole which are sequentially arranged; and the end erasure part is a rotating body whose cross-sectional area increases along the direction of the flowing medium. The electromagnetic valve has excellent erasure effect.

The invention discloses a method for preparing titanium-based spherical powder with fine particle size by gas atomization. The method is as follows: 1. Put titanium-based raw materials and tin materials into a melting crucible, and then place them in vacuum induction melting gas atomization equipment Vacuum induction smelting is carried out in the smelting chamber; 2. After the titanium-based raw material and tin material are melted by vacuum induction smelting, they are filled with argon for protection, and then the graphite guide tube at the bottom of the melting crucible is heated, and the titanium-based raw material is The molten liquid produced after melting with the tin material falls freely into the atomization chamber through the heated graphite guide tube, and the atomized powder is obtained after the vacuum induction melting gas atomization treatment, and the titanium-based spherical powder is obtained in the collection tank. In the present invention, the tin element is introduced into the titanium raw material or titanium alloy raw material to reduce the viscosity of the molten liquid obtained after smelting, so that it is easy to be broken during gas atomization, and the particle size of the obtained powder becomes finer. Among them, the titanium-based spherical powder The yield of powder with a medium particle size less than 45 μm is not less than 28%, the internal pores of the powder are reduced, and the number of hollow powders is reduced.

The invention relates to low temperature resistant microalloyed steel. The chemical components of the microalloyed steel comprise, by weight, 0.075%-0.1% of C, 0.10%-0.30% of Si, 1.0%-1.40% of Mn, 0.25%-0.50% of Cr, 0.020%-0.030% of Nb, 0.015%-0.025% of Ti, less than or equal to 0.015% of Al, less than or equal to 0.010% of P, less than or equal to 0.010% of S, the balance Fe and unavoidable impurity elements. The unavoidable impurity elements comprise the gas content and other unavoidable impurity elements, wherein the gas content comprises less than or equal to 2.0 ppm of molten steel [H], less than or equal to 2 ppm of a casting blank [H], less than or equal to 30 ppm of [O] and less than or equal to 50 ppm of [N]; and the other unavoidable impurity elements account for less than or equal to 1%. Meanwhile, the invention further relates to a production technology of the low temperature resistant microalloyed steel. Through a Nb+Ti microalloyed technology, growth of austenite grains is effectively controlled in the heating process of steel rolling, a ferrite-pearlite ultra-fine grain structure is obtained finally, the grain size reaches above the 10th level, and the technical requirements for indexed such as low temperature are met. The yield strength of the microalloyed steel is higher than 355MPa, the tensile strength is higher than 550MPa, -60 DEG C low temperature impact Ak is higher than 27J, and the elongation after breaking is higher than 22%.

The invention provides a rolling technology for high-carbon steel in thin slab casting and rolling. The rolling technology includes the processes of continuous casting, heat evening, scale removing, rolling, inter-stand cooling, laminar cooling, reeling and insulation cover slow cooling. The rolling technology is characterized in that the rolling process includes three stages of Austenite perfect recrystallization rolling, non-recrystallization area Austenite rolling and two-phase area rolling. Medium-and-high-carbon steel structures rolled through the rolling technology are even and fine ferrite and particular pearlite, banded structures can be improved, the mechanical property is good, the annealing process does not need to be conducted before forming, cost is reduced, and quite high practicability is achieved.

The invention relates to a pin barrel single-screw refiner. According to the pin barrel single-screw refiner, a motor drives a threaded rod to rotate after a speed reducer reduces the speed, the threaded rod is arranged in a cylindrical barrel with a radial pin, and a feeding port performing feeding tangentially is formed in the front end of the threaded rod; a fiber raw material is forcibly put into the refiner through a spiral propeller, and under the squeezing action of the threaded rod, the fiber raw material passes through a feeding area of the threaded rod, a plurality of squeezing and cutting areas and is discharged from a discharging area of the tail section of the threaded rod; in a refining process, a main cutting pin set is combined with a plurality of impellers to form a main cutting element respectively, an auxiliary cutting pin set is combined with a transport spiral notch to form an auxiliary cutting element, then the squeezing and cutting functions are applied on a material, so that the fiber raw material is processed into required pulp step by step. The pin barrel single-screw refiner has the advantages of simple structure, lower manufacturing cost, reduced no-loadpower consumption, and convenient use and maintenance.

The invention discloses a kind of automatic fingerprint recognition technology under confirmation pattern, especially points to the problem that the picture has bifurcation which is not thinned completely and has burrs after the improved OPTA algorithm is thinned. The incomplete thin is caused by incomplete eliminating of template, thus the invention constructs eliminate template and the retention template to process the situation. The burr is generated by the asymmetry of retention template, thus, on base of the 6 retention templates of improved OPTA algorithm, reduces the templates which have upwards, leftwards and rightwards burrs, and eliminates the burrs. The invention also proposes a new method for withdrawing the fingerprint picture direction information with multistage division.

The invention relates to a biomass feed extruder. An extrusion propeller assembly of the extruder comprises a propeller rear axle, a propeller front axle and a propeller outlet taper sleeve, wherein the propeller rear axle is located in an extrusion box assembly and fixedly connected with a power output shaft of a power source through a transmission mechanism, the propeller front axle and the propeller rear axle are connected and both provided with threads, the propeller outlet taper sleeve is fixed to the front end of the extrusion box assembly, and the propeller front axle is located in a conical hole of the propeller outlet taper sleeve; a hopper welding part is fixed above the extrusion box assembly, a stirring shaft of a feeding and weed pulling mechanism is connected with the power output shaft of the power source through the transmission mechanism, the stirring shaft and a stirring plate are located in the extrusion box assembly, and the stirring plate is fixed to the front end of the stirring shaft; the cross section of the stirring plate is in the shape of a broken line, and the left portion and the right portion of the stirring plate are parallel to each other. By the adoption of the biomass feed extruder, accumulation and blocking of materials can be effectively avoided, and production efficiency is high.