31results about How to "Uniform wall" patented technology

A process produces a welded seamless PIPE having good yield strength and excellent corrosion and/or erosion resistance. Up to a maximum outside diameter corrosion and/or erosion resistant CRA PIPE is cold worked from a welded hollow, rather than using the traditional seamless pierced hollow method. A high-speed roll-forming mill is also utilized, rather than using the slow traditional break press to form the welded hollow. Welded hollow dimensions can be achieved which comply with the method of cold working's capability to produce the yield strengths and dimensional tolerances required to meet the service criteria of the PIPE's intended application.

The invention discloses a reamer. The reamer comprises a rack, wherein the rack is provided with an electromagnetic heating device and a reaming device which are arranged from front to back in sequence; the electromagnetic heating device comprises an electromagnetic heating coil; the reaming device comprises a reaming hole driven by a first power device; the rack is provided with a poking plate feeding device; the poking plate feeding device comprises a rotating shaft connected with a second power device; the rotating shaft is transversely arranged on the rack; the two ends of the rotating shaft are fixedly provided with circular poking plates; the peripheral parts of the poking plates are provided with at least three feeding fork entries for conveying metal pipes; poking plates are formed between adjacent feeding fork entries and can rotate to the positions, corresponding to the electromagnetic heating coil and a reaming head, on every two adjacent feeding fork entries respectively. The reamer has the advantages of high production efficiency, small floor area and low power consumption.

The calcining process of synthesizing hollow silica-alumina ball includes the steps of crushing sawdust, mixing with water and adhesive, making wet ball kernel, turning the wet ball kernel in ball forming machine in proper rotation speed while throwing proper amount of refractory silica-alumina powder for coating the ball kernel, and calcining at high temperature to produce the hollow silica-alumina ball. The hollow silica-alumina ball has low bulk density, low production cost and other advantages, and is used as the material for producing high grade refractory material. The present invention makes it possible to producing light refractory material with bulk density smaller than 0.6 g/cu cm.

An internal circulation ball screw includes a threaded shaft, a nut having a receiving space, a circulation member mounted to the receiving space and having a first circulation groove and a second circulation groove, and a plurality of rolling members running between the threaded shaft and the nut. The first circulation groove defines a first front section, a first rear section, and a first curved section communicating with the first front section and the first rear section separately. The second circulation groove defines a second front section, a second rear section, and a second curved section communicating with the second front section and the second rear section separately. The first and second curved sections define a predetermined included angle with respect to the threaded shaft radially. Therefore, the wall between the circulation channels is uniform to enhance the durability of the ball screw.

The invention discloses an induction hardening tooling for an outer shell of a disc six-hole type cage constant velocity universal joint. The induction hardening tooling comprises a base and a seal disc, wherein a straight shank is arranged at the bottom of the base; the seal disc is fixedly mounted on the base; a cavity is formed in the position, below the seal disc, of the base; a through hole is formed inside the straight shank; a counter bore is formed in the seal disc; a plurality of water spraying pillars are fixedly connected around the counter bore; blind holes are formed inside the plurality of water spraying pillars; and water spraying holes are formed in the inner side walls of the plurality of water spraying pillars. According to the induction hardening tooling, the purposes that the hole walls of six holes of a workpiece are effectively cooled, and the temperature is reduced are achieved; the edges of the six holes of the workpiece are prevented from generating cracks due to the high temperature penetrating actions of the inner cavity and six grooves when the workpiece is subjected to medium-frequency induction hardening; depths of hardening layers of the inner cavity and the six grooves of the workpiece are guaranteed to reach an effective range; the uniformity of clearances between the hole walls of the six holes and the water spraying pillars can be guaranteed through self centering; and the cooling water pressure and quantity received by the six holes of the workpiece can be guaranteed to be uniform.

The invention relates to the field of agricultural tools, in particular to a soil drilling tool, which includes a cylindrical cylinder, the end of which is a cone structure, and two Semicircular steel blades, the angle between the two semicircular steel blades is between 30-90°, and the angle between the two semicircular steel blades and the axis of the cylinder is consistent, the two semicircular steel blades There is no staggered area in the projection of the shaped steel blades on the horizontal plane; a handle is arranged horizontally on the top of the cylinder. The obtained soil drilling tool of the present invention, when drilling soil holes, rotate the handle on the tool and give a certain pressure, pull out the tool vertically after rotating two or three times, discard and stick on two semicircular steel blades of soil and continue to repeat the process. This process is especially suitable for drilling soils with high water content or paddy fields. Application of the invention provides a punching tool, and the walls of the drilled soil holes are smooth and uniform.

The invention discloses a preparation method of tubular metal catalyst comprising dissolving metal salt and sodium nitrate in dimethyl sulfoxide to obtain mixed solution; taking aluminum oxide porous template with nano path as template, conducting electrochemical deposition of the mixed solution at the nano path, and removing the template to obtain the tubular metal catalyst. The invention takes polar aprotic solvent dimethyl sulfoxide (DMSO) as solvent and electrolyte, since DMSO contains S group with weak absorption effect to metal surface, when metal is reduced to particles, DMSO moleculeswill absorb on the particle surface to inhibit the particle from growing large to make the prepared tubular metal catalyst wall thin and to increase the activated area. Furthermore, DMSO with relatively wide electrochemical window, high dielectric constant and high viscosity can ensure the prepared tubular metal catalyst wall is thin and made of particles, the length diameter ratio is high and the wall is uniform.

The invention relates to the field of wall decoration materials, in particular to novel high-strength gypsum thermal insulation putty and a preparation method thereof. The novel high-strength gypsum thermal insulation putty is prepared from the following raw materials in parts by weight: 50 to 70 parts of alpha-high-strength gypsum, 7 to 10 parts of vitrified micro beads, 0.1 to 0.3 part of cellulose ether, 1 to 2 parts of redispersible latex powder, 0.1 to 0.5 part of a retarder, 0.1 to 0.5 part of a thixotropic agent and 0.01 to 0.05 part of an air entraining agent, wherein the particle size of the vitrified micro beads is 180-200 meshes; and the cellulose ether comprises 2wt% of modified cellulose ether with the viscosity being 18000-22000mPa.s at the temperature of 20 DEG C. The novel high-strength gypsum thermal insulation putty can be used as gypsum thermal insulation mortar and can also be used as gypsum putty for leveling, additional gypsum putty leveling is not needed after construction, and the one-time construction thickness can reach 30 mm, so that construction procedures are reduced, construction is smooth, the constructed wall surface is uniform, scraping is fine and smooth, no color difference exists, and the novel high-strength gypsum thermal insulation putty has an excellent decoration effect; and the later-period heat preservation performance is not reduced, and the hollowing and cracking phenomena are avoided.

The invention relates to a plastic vessel and a preparation process thereof. The plastic vessel comprises a barrel body, wherein the external circumference of the top surface of the barrel body is provided with a supporting conveying ring; the circumference of the barrel body is provided with two annular ribs. The plastic vessel is characterized in that the supporting conveying ring and the barrel body are of a split structure; the barrel body is formed by stretching the supporting conveying ring in a hot state and combining and tightening the supporting conveying ring with the top surface of the barrel body; the external circumference in the top surface area of the barrel body is provided with an annular groove; correspondingly, the internal circumference of the supporting conveying ring is provided with an annular convex body which is matched with the annular groove; the supporting conveying ring is inlaid and tightened at the external circumference of the top surface of the barrel body. The plastic vessel and preparation process has the advantages that the supporting conveying ring and the barrel body of the plastic vessel are of the split structure, the barrel wall of the barrel body is uniform, the material consumption is low and the material cost is reduced; furthermore, the preparation process of the plastic vessel is simple, so that the equipment investment cost and the material cost are lowered.

The invention discloses a steel-plastic composite pipe framework positioning device and method without secondary machining. The steel-plastic composite pipe framework positioning device comprises a mold, a framework body and plastic positioning nails; the mold is detachably divided into an upper part and a lower part, and a mold cavity matched with the containing framework body is formed in the mold; placing grooves are formed in the periphery of the mold cavity; support nuts are fixedly arranged on the surface of the framework body; and the plastic positioning nails are fixed on the support nuts. When the framework body is placed in the mold cavity, the plastic positioning nails are inserted into the placing grooves to realize positioning of the framework body, and the framework body is jacked up through the support nuts, so that the framework body is suspended relative to the mold, and the uniform distance between the framework body and the mold cavity wall of the mold is ensured. Bymeans of the device, a steel framework can be effectively positioned, meanwhile, when the steel-plastic composite pipe is completed, only redundant plastic positioning nails need to be cut off, secondary plugging machining is not needed, and it is guaranteed that the risk of leakage of the pipe due to plugging quality is avoided.

The invention discloses a small cotton bag clamping mechanism. A small cotton bag conveying device comprises a hard conveying belt, multiple bag clamping mechanisms are arranged on the hard conveyingbelt side by side, each bag clamping mechanism comprises two supports, a fixing rod sleeves the top end of each support, a supporting plate is arranged at one end of each fixing rod and comprises a vertical plate and an oblique plate connected with the top of the vertical plate, and an obtuse angle is formed between each oblique plate and the corresponding vertical plate; a compression spring is arranged between each vertical plate and the corresponding support and sleeves the corresponding fixing rod, and a cotton bag clamp for clamping cotton bags is arranged on each notch. Through the smallcotton bag clamping mechanism, a cotton bag can be uniformly supported only through a U-shaped plate; a big cotton bag after being supported is uniform in wall and free of breakage, and efficiency and quality when compared with conventional artificial cotton bag supporting are improved greatly.