9results about How to "No cracking" patented technology

This utility model discloses a steel bar straightening mechanism, including a straightening mechanism and a feeding tray for placing the steel bar coil. The feeding tray is equipped with a limiting cylinder. Before entering the straightening mechanism, the steel bar is bent in the opposite direction by the limiting cylinder. An mounting plate is provided on the side of the feeding tray, and a movable plate is slidably mounted on the mounting plate. A screw pair is provided at the bottom of the movable plate, and a self-locking screw is rotatably mounted in the through groove in the middle of the movable plate. The self-locking screw is installed in cooperation with the screw pair. The limiting cylinder is rotatably mounted on the movable plate through a mounting shaft. The steel bar will not twist before straightening, ensuring the mechanical properties of the steel bar. Moreover, the initial reverse bending of the coiled steel bar before straightening significantly reduces the curvature of the steel bar. Subsequent straightening will not cause cracking, reducing the deformation of the steel bar during straightening and thus improving the straightening efficiency.

This invention belongs to the technical field of fiber-reinforced polymer composite materials, specifically relating to a method for preparing ramie fiber-reinforced bio-based polycarbonate composite materials. First, ramie fibers modified with isosorbide difuranate are synthesized. Then, 100 parts by weight of bio-based polycarbonate, 10-50 parts by weight of isosorbide difuranate-modified ramie fibers, and 0.1-1.0 parts by weight of antioxidant are mixed evenly and added to a hopper. The ramie fiber-reinforced bio-based polycarbonate composite material is then prepared using a twin-screw extruder. In this method, isosorbide difuranate, isosorbide, and ramie fibers are all bio-based materials, and their proportions are adjustable. Isosorbide difuranate contains a large number of ester bonds, and the isosorbide structure is identical to the alcohol structural unit in bio-based polycarbonate, effectively enhancing the compatibility between ramie fibers and bio-based polycarbonate.

This invention discloses a composite fluorescent ceramic for reflective laser illumination and its preparation method. The method includes: S1: preparing YAG powder, YAG:Ce powder, and YAG-Al2O3 powder respectively; S2: pressing the YAG / YAG:Ce / YAG-Al2O3 composite ceramic blank by dry pressing, followed by vacuum sintering and annealing; S3: forming a conical structure array on the YAG portion of the composite ceramic surface using laser engraving, resulting in a final composite fluorescent ceramic thickness of 4–5 mm. The composite fluorescent ceramic for reflective laser illumination prepared by this invention has advantages as a luminescent material, including high thermal conductivity, high luminous efficiency, and low incident light surface temperature.

The utility model relates to a decorative plate technical field especially waterproof ventilative heat preservation decorative plate of super high strength, including substrate, first cement mortar bonding layer, heat preservation layer, second cement mortar reinforcing layer, thick paste heat preservation coating layer, decoration layer, substrate lower extreme has first cement mortar bonding layer, heat preservation layer from top to bottom in proper order, the upper end of substrate has second cement mortar reinforcing layer, thick paste heat preservation coating layer, decoration layer from bottom to top in proper order, the utility model is equipped with cement mortar bonding layer for cement wall body bonding, thickness 3 10mm, contains 0.1 0.17mm's carbon fiber weaving net reinforcing anti cracking, its tensile strength > 100MPa, tensile strength is greater than 400MPa, can bear 20kg steel ball's 10m height impact without cracking, set up heat preservation layer, select the heat conductivity coefficient less than 0.04W's heat preservation material, density less than 100kg / m3, flame -retardant A level, according to national standard standard, design specification and energy -conserving 75% standard, its thickness 75 110mm.

The utility model provides a layered mixing and stirring device. The layered mixing and stirring device comprises a tank body and a plurality of trays, the tank body is provided with an inner cavity and a plurality of insertion holes communicated with the inner cavity, and the width of each insertion hole is equal to the inner diameter of the inner cavity; a stirring shaft is arranged in the inner cavity and is in transmission connection with a driving component. The plurality of trays are inserted into the plurality of insertion holes in a one-to-one correspondence manner so as to divide the inner cavity into a plurality of chambers; a butt joint groove is formed in the peripheral face of the tray, and the butt joint groove is formed in the vertical direction in a penetrating mode. A plurality of baffles and a plurality of stirring blades are arranged on the stirring shaft, the baffles can be embedded into the butt joint grooves in a one-to-one correspondence mode, and the stirring blades are located in the cavities respectively so as to stir materials in the cavities. According to the layered mixing and stirring device, the soft soil and the cement powder can be stirred in different areas, the stirring effect of all the areas is consistent, and the technical purposes that the finished soft soil meets the foundation reinforcement requirement and does not crack are achieved.

This invention relates to a high-performance polymer-cement-based composite repair material and its preparation method. The high-performance polymer-cement-based composite repair material, by mass fraction, comprises the following components: 690-710 parts cement; 130-150 parts fly ash; 45-55 parts silica fume; 200-210 parts mixing water; 950-1050 parts fine aggregate; 21-23 parts modified polymer; 9-10 parts expansion agent; 4-5 parts water-reducing agent; 5-6 parts modified fiber; and 0.16-0.18 parts defoamer. This invention utilizes nano-toughened modified polymer and modified fiber. The nano-modified polymer improves the microstructure of the repair material, while the modified fiber limits shrinkage and enhances the crack resistance of the matrix. The synergistic effect of both effectively improves the toughness and mechanical properties of the repair material, ensuring that early cracking does not occur.

The application relates to the technical field of X-ray protection and detection materials, and discloses a high X-ray absorption material based on metal oxide composite, which is composed of 30%-50% core absorption components, 5%-15% synergistic enhancement components and the rest base components; a preparation method of the material comprises metal oxide powder pretreatment, modified epoxy resin base synthesis, composite forming and step-by-step curing. The material has excellent X-ray absorption efficiency in a 15-500 keV wide energy range, the shielding efficiency is greater than or equal to 97% under a 80-150 kV tube voltage, the lead equivalent is 0.8-1.2 mm Pb, and the density is only 3.5‑5.0g / cm3 The material has excellent mechanical properties, environmental stability and environmental protection, is lead-free and pollution-free, the preparation process is simple and controllable, and can be widely applied to the fields of medical protection, industrial detection, safety detection and the like.

This invention proposes a method for lifting and raising a single-column cantilever cap beam, belonging to the field of building construction technology, including the following steps: S1: Clear the soil covering the pier cap location to expose the side of the pier cap; S2: Install reinforcing bars on the side of the pier cap to expand the pier cap; S3: Install the beam bottom support and clamp beam formwork under the cap beam, and construct the clamp beam around the pier column; S4: After the clamp beam construction is completed, remove the clamp beam formwork and beam bottom support; S5: Install steel pipe columns and lifting equipment on the pier cap; S6: Cut the pier column to form an upper pier column and a lower pier column; S7: Operate the lifting equipment to lift the clamp beam, and cyclically lift the upper pier column and the cap beam; S8: Extend the pier column height; S9: Remove the clamp beam; S10: Remove the lifting equipment and steel pipe columns. A clamp beam is constructed at the bottom of the cap beam to support the bottom of the cap beam. Steel pipe columns and jacking equipment are arranged around the outer side of the pier column below the clamp beam. During jacking, the stress on the cap beam is basically the same as the normal stress, and cracking will not occur, thus ensuring the quality of the project.

This invention provides a high-temperature conductive silver paste for a microcrystalline glass thick-film heating plate, its preparation method, and sintering process. The high-temperature conductive silver paste for the microcrystalline glass thick-film heating plate, by mass percentage, comprises: silver powder: 75-85%; composite glass powder: 1-5%; organic carrier: 10-24%. The composite glass powder comprises component A and component B in a mass ratio of 1-3:1. Component B is silicon micropowder. Component A, by mass percentage, comprises: silicon oxide: 35-50%; boric acid: 20-30%; magnesium oxide: 10-15%; aluminum oxide: 5-10%; titanium oxide: 3-5%; and zirconium oxide: 1-2%. The high-temperature conductive silver paste for the microcrystalline glass thick-film heating plate prepared by this invention has high solderability, strong adhesion, a maximum operating temperature exceeding 450℃, strong resistance to high current impact, high re-firing stability, and excellent overall performance.