54results about How to "Reduce or avoid the generation of" patented technology

The invention discloses clad material solid / liquid composite horizontal continuous casting and forming equipment and method, and belongs to the technical field of clad material continuous casting. According to the clad material solid / liquid composite horizontal continuous casting and forming equipment and method, the measures that a core material protection device, a flow guide pipe, an inversion solidification device and the like are adopted and mounted below a crucible, core materials are not heated in advance, the inversion solidification device with small capacity is designed, the core materials are prevented from penetrating through clad layer melt metal for a long time, the melt metal flows out from the bottom of the crucible by relying on self-weight, and the size of the inversion solidification device and the size of a water-cooled crystallizer are controlled effectively are taken, the high quality clad materials of needed shapes and sizes are formed through horizontal continuous casting, and the equipment and the method are especially suitable for horizontal continuous casting forming of the large-size clad materials which are hard to reel up and has the melting point of the clad layer metal lower than that of the core material metal. The equipment and method have the advantages that the equipment is simple in structure, parts are easy to replace, operation and maintenance are convenient to carry out, layout is reasonable and compact, production efficiency is high, investment is small, automatic control is easy to achieve, large-scale industrial production is facilitated, the procedure of the forming process is short, energy is saved, environment is protected, efficiency is high, cost is low, the combination freedom of the clad layer metal and the core material metal is large, and the prepared clad materials are good in quality and performance.

The present invention belongs to the field of silk-screen printing matched equipment technology, in the concrete, it relates to a semi-automatic screen-laying machine and screen-laying process. It is characterized by that said screen-laying machine mainly includes the following several portions: rectangular frame, supporting frames, screen roll, screen roll hanger shaft, first screen-dividing shaft, second screen-dividing shaft, first screen-pressing roller, second screen-pressing roller, third screen-pressing roller, bearing running wheel and running guide wheel. Said invention also providesthe connection mode of all the above-mentioned portion and the concrete steps of its screen-laying method.

The invention discloses a bolt-free PCB wiring terminal provided with a button. The bolt-free PCB wiring terminal provided with the button includes a base, a flat sheet spring, a clamping part, and a button; wherein the flat sheet spring and the clamping part are adaptively arranged in an accommodating cavity of the base, and the upper part of the flat sheet spring is elastically pressed against the top of the clamping part in an inclined manner; a button groove is arranged in the top of the base, and the button is slidably limited in the button groove; a first through hole for allowing the button to pass through, is arranged in the top of the clamping part, the side part of the base is provided with a wire inserting hole leading to the accommodating cavity and corresponding to the inclined upper part of the flat sheet spring, and the wire inserting hole allows a wire to push away the flat sheet spring and to be clamped between the flat sheet spring and the clamping part. According to the bolt-free PCB wiring terminal provided with the button, through improving a structure, the wiring capacity of the wiring terminal is improved and the reverse warping during wire withdrawing of a clamping spring can be avoided, and the damage to the wire due to wire withdrawing can be reduced; the bolt-free PCB wiring terminal provided with the button has the characteristics of wire fast connection, high reliability, and large wiring capacity.

The invention provides a magnesium and steel special metal superaudio frequency pulse laser smelting braze-welding wire and a welding method. The welding method comprises the following steps of: forming a beveled edge on a part to be welded of a magnesium alloy and a steel workpiece, and removing oil dirt and an oxidation film from the surface of the workpiece; fixing the magnesium alloy and the steel workpiece on a welding fixture, adjusting the position and the angle of a wire feeding device, automatically feeding the welding wire at a certain angle in front of a laser beam, and protecting a welding seam through argon, wherein the welding wire comprises the following components in percentage by weight: 2 to 10 percent of Al, 0.5 to 5 percent of Zn, 0.1 to 1 percent of Sr, 0.05 to 0.2 percent of B, 0.5 to 2 percent of RE and the balance of Mg; and placing the laser beam on one side of the magnesium alloy workpiece in a slightly deviating way, and heating the welding wire and the magnesium alloy workpiece by using superaudio frequency pulse laser to form a smelting pool, wherein the steel workpiece is kept in a solid state substantially in a welding process and acts with liquid magnesium alloy to form a welding joint. The key and common problem that the improvement of the welding quality of Mg / Fe and Mg / Ti immiscible heterogeneous metal is limited is solved, and the application range of laser smelting braze-welding is expanded.

The invention discloses a corrosion-resistant roll which is characterized by comprising a base and a corrosion-resistant coating coated on the base surface, wherein the corrosion-resistant coating is prepared by spraying a corrosion-resistant spraying powder. The corrosion-resistant roll can be widely used as a sink roll, guide roll or support roll in a hot-galvanizing or hot-aluminizing production line, and has favorable corrosion resistance. The corrosion-resistant layer on the roll surface has the advantages of favorable thermal shock resistance, low tendency to cracking or shedding and long service life, and the produced galvanized or aluminized steel plate and the like have higher quality.

The invention discloses a lipoic acid liquid preparation and a preparation method thereof. The preparation comprises lipoic acid as a main ingredient, a polymerization inhibitor lysine, and a pH regulator. The composition of the preparation is simple, but it can significantly improve the stability of the liquid medicine under high-temperature sterilization and strong light irradiation, and in particular can greatly reduce the generation of lipoic acid dimer impurities. By adding the auxiliary stabilizer D-sorbitol, the effect of stabilizing the quality of the medicinal solution is further enhanced. The invention strictly controls the preparation process of the injection, fills the liquid with nitrogen for protection in the whole process of liquid preparation, dissolution and potting, timely monitors the residual oxygen of the liquid, effectively controls the degradation of lipoic acid in the aqueous solution, and ensures the safety of clinical use. Safe and effective.

The invention discloses a block type multidirectional forging device, which comprises a frame, a die for forming a product and a hydraulic transmission device. The hydraulic transmission device comprises a main cylinder, a jacking cylinder and at least two lateral extrusion cylinders, wherein a movable element is arranged at the rear end of each lateral extrusion cylinder; and the frame comprisesa bracket and fasteners in wrapped connection with the outer sides of the movable elements and used for fixedly connecting a plurality of movable elements sequentially, and each fastener has a closedannular structure. According to the device, the movable elements are arranged at the rear ends of the lateral extrusion cylinders and fixedly connected with the fasteners, and when each lateral extrusion cylinder extrudes a workpiece, a force reacting on the frame can directly act on the fasteners; and because the fasteners have the closed annular structures, stress balance at each position of the fasteners is ensured, the forging precision is effectively ensured, degraded products are reduced or avoided, the working efficiency is improved, and the production cost is reduced.