5results about How to "Controllable diameter" patented technology

The application relates to a sodium titanate nanofiber / reduced graphene oxide composite electrode material and a preparation method and application thereof. The composite electrode material has a two-dimensional sheet structure, the particle size is 1-6 mu m, the thickness is 10-20 nm, is composed of a few-layer reduced graphene oxide and sodium titanate nanofibers with a diameter of 5-10 nm loaded on the reduced graphene oxide, and is prepared by taking the few-layer reduced graphene oxide as a template, uniformly loading titanium dioxide particles, and then carrying out hydrothermal treatment in an alkali solution. Compared with the prior art, the synthesis method is simple in process, easy to scale up, and high in controllability. As a negative electrode of a sodium ion battery or a positive electrode of a sodium battery, the sodium titanate nanofiber / reduced graphene oxide composite electrode material has the advantages of high initial coulomb efficiency, low working voltage, high capacity, excellent rate characteristics and cycle stability, and has a broad market application prospect.

The application relates to a doped optical fiber preparation process and discloses a high-uniformity and high-concentration Pr 3+ The application discloses a preparation method of a doped quartz-based glass optical fiber. Rare earth oxide Pr2O3, silica powder SiO2 and aluminum oxide Al2O3 are weighed, mechanically mixed, ball milled, dried, sieved, pre-sintered to be transformed into cristobalite, drawn into a glass rod containing a core by using a tube melting method, and processed to remove the outer cladding of the glass rod to obtain a core rod with adjustable diameter. The tube rod method is combined with a high-purity quartz tube to form an optical fiber preform rod. Finally, the optical fiber preform rod has high uniformity, low loss and high concentration of Pr 3+ The application discloses a drawing method of a doped quartz optical fiber. The aluminum oxide Al2O3 is introduced to improve the solubility of the rare earth ion Pr 3+ in the quartz glass and reduce the melting point of the quartz raw material. The rare earth doping concentration is adjustable. The raw material is transformed into cristobalite by pre-sintering, and the effect of reducing the bubbles of the core glass and improving the uniformity of the core glass is remarkable by combining the vacuum tube melting method.

The invention discloses an oil cylinder type internal pressure loading device and method for a circular lining internal pressure test, the oil cylinder type internal pressure loading device comprises multiple groups of radial loading units, a mounting seat and a hydraulic control system, the radial loading units are divided into first loading groups and second loading groups which are alternately arranged at intervals, each first loading group comprises a first oil cylinder and a first arc-shaped base plate connected with the first oil cylinder, and each second loading group comprises a second oil cylinder and a second arc-shaped base plate connected with the second oil cylinder; the second loading group comprises a second oil cylinder and a second arc-shaped base plate connected with the second oil cylinder; the first oil cylinder and the second oil cylinder are fixed through mounting seats, and piston rods of the first oil cylinder and the second oil cylinder extend in the radial direction of the lining; the outer surfaces of the arc-shaped base plates are cambered surfaces matched with the inner wall of a lining, wedge-shaped ends are machined at the two ends of the first arc-shaped base plate, and matched wedge surfaces are machined on the inner peripheries of the two ends of the second arc-shaped base plate. The hydraulic control system is connected with the first oil cylinder and the second oil cylinder and controls the stretching and retracting time sequence of the first oil cylinder and the second oil cylinder, no mechanical interference exists between the first arc-shaped base plate and the second arc-shaped base plate in the stretching and retracting process, and the outer arc surfaces of all the arc-shaped base plates are continuously attached to the inner wall of the lining.

This invention discloses a radiation shielding device for an X-ray generator, comprising a generator body, an emission front end at one end of the generator body, a shielding rear sleeve fixed to the emission front end, a positioning seat fixed to one side of the generator body, a rotating sleeve connected to one side of the positioning seat, and a plurality of positioning sleeves arranged around the outer periphery of the rotating sleeve. In this invention, a rotating sleeve and a plurality of positioning sleeves are arranged around the outer periphery of the rotating sleeve. A shielding middle sleeve that slides axially is fitted onto the positioning sleeve. A shielding front cover is fitted onto the front part of the shielding middle sleeve, and a target hole is opened at the front end of the shielding front cover. The target holes on each shielding front cover surrounding the rotating sleeve have different diameters. When the rotating sleeve is rotated, the surrounding shielding front covers can dock with the shielding rear sleeve on the generator body through the shielding middle sleeve. This arrangement makes the diameter of the X-ray beam formed by the emission front end adjustable and easy to adjust, suitable for different detection area requirements.

The invention relates to the technical field of wire drawing machines, in particular to a wire drawing machine for high-quality metal wire production, which comprises a frame body and a wire drawing mechanism. The wire drawing mechanism comprises a die sleeve, a front end cover, a rear end cover and a wire drawing die. The die sleeve is installed on the frame body, and the front end cover, the wire drawing die and the rear end cover are all arranged on the die sleeve. The wire drawing die is of a conical structure and comprises a plurality of first split dies and a plurality of second split dies, a wire drawing channel is defined by the first split dies and the second split dies, a first guide groove is formed in the die sleeve, and the second split dies are in sliding fit with the first guide groove. According to the wire drawing machine for high-quality metal wire production, the multiple first split dies and the multiple second split dies move in the first guide grooves, the diameter of a wire drawing channel is adjustable, and the operation difficulty and the labor intensity when a metal wire penetrates through the wire drawing die are reduced.