5results about How to "Uniform contact surface" patented technology

The invention belongs to the technical field of iron tower welding, and discloses an iron tower steel structure welding fixing tool which comprises a workbench, when a bearing frame plate vertically ascends and descends, the distance between the bearing frame plate and a square strip can be close or away, and generated extrusion force and traction force are generated; a rotating plate drives a sliding block to slide back and forth on the inner wall of a sliding hole formed in the top of a bearing frame plate, the sliding block drives an L-shaped rod and a positioning shell to move back and forth, the positioning shell drives a positioning roller to move back and forth, the positioning roller can extrude the side faces of the steel plates in the moving process, and therefore the angle between the two steel plates is adjusted and controlled; and it is ensured that the steel plate can be located at the correct relative angle in the welding or assembling process. The precise angle regulation and control are of great importance for ensuring the stability of structural parts, reducing errors and improving the assembly precision. And the production line can process various welding tasks of different types more flexibly, the types of welding items are expanded, and the diversity of products is improved.

This invention provides a welding processing device and method for inner and outer meshes of a filter, including a processing table, a lifting mechanism, a moving mechanism, a roller electrode, a shaft electrode, and a clamping mechanism. It simplifies the complex spatial helical motion into a single axial movement of the roller electrode within the joint channel. It eliminates the need for expensive and complex high-precision multi-axis CNC systems; only a common motor is needed to drive the roller electrode to move linearly along the joint channel, completing the oblique seam welding of the filter's metal mesh. The workpiece can be rotated purely mechanically, resulting in low cost and high welding efficiency. Furthermore, a micro-forging process is used to pre-form a solid metal strip with a width of approximately 1-2 mm and no through holes. This solid strip provides a continuous and uniform contact surface for the subsequent roller electrode, thereby providing constant resistance and an ideal current path. This allows for controllable and predictable generation of welding heat, significantly reducing the occurrence of incomplete welds and overheating caused by mesh holes.

This utility model relates to the field of landscape engineering construction, specifically a lawn compaction mold for ecological grassed ditch construction. By incorporating rollers and a pull rod traction component, when the construction worker pulls the pull rod traction component, the rollers roll along with it. The rollers have an arc-shaped cross-section, perfectly conforming to the curve of the grassed ditch. This ensures uniform contact between the rollers and the lawn and soil during compaction, and the rollers apply uniform pressure to the lawn during movement. This avoids the localized loosening or over-compaction caused by uneven force during manual compaction. It effectively solves the problem that in the lawn laying and compaction stage, construction workers often use shovels to compact the lawn to ensure close contact between the lawn roots and the soil. However, because grassed ditches typically have an arc-shaped structure, manual compaction is difficult to completely conform to the curve of the ditch, resulting in poor molding effects and the grassed ditch being prone to unevenness or localized loosening.

The application relates to the technical field of microspheres, and particularly provides a preparation method of carboxylated porous microspheres, which comprises the following steps: adding a biocompatible polymer, an acrylic copolymer and an oil-soluble emulsifier into an organic solvent to be dissolved and prepared into a dispersed phase; adding a water-soluble emulsifier and / or a protective colloid into water to be prepared into a continuous phase; mixing the dispersed phase and the continuous phase to obtain an emulsion, continuously stirring until precipitation appears, collecting the precipitation, cleaning, drying and obtaining the carboxylated porous microspheres. In the continuous stirring stage, air blowing or a crosslinking agent can be added. The carboxylated porous microspheres have good fluidity and good nucleic acid extraction and purification effects.

The application discloses an environment-friendly flue conversion device with a heat energy recycling function and a method thereof, and belongs to the technical field of fine chemical engineering equipment. In order to solve the problem of heat energy loss caused by incomplete flue gas heat exchange treatment, heat exchange fins are arranged in the heat exchange channel, the heat exchange fins are arranged in a radial array, and the heat exchange fins are internally provided with serpentine pipes. The arrangement of the serpentine pipes and the heat exchange fins enables the main pipeline to have good wear resistance in flue gas, the radial array arrangement is uniform and consistent with the flue gas contact surface, uneven flue gas flow in the cross section is avoided, the full contact of high-temperature flue gas and the first heat exchange assembly is improved, the heat exchange efficiency is improved, the cooling water is used to perform second-stage heat exchange and dust and sulfur removal on the flue gas through the spray head, the cooling water is filtered through the filter screen after the second-stage heat exchange and is discharged, the residual heat in the flue gas is recycled through the second-stage heat exchange while the flue gas is effectively dust and sulfur removed, the heat exchange efficiency of the flue gas is improved, and the heat energy is fully utilized.