6results about How to "Increase internal stress" patented technology

The utility model discloses a double-channel grading sealing gasket structure of a pipeline repairing device, which relates to the technical field of pipeline repairing devices and comprises an upper shell of the pipeline repairing device, a lower shell of the pipeline repairing device and two groups of sealing gaskets, and the two groups of sealing gaskets are respectively arranged on the inner walls of the upper shell and the lower shell; the sealing gasket comprises two gasket body straight edge sections, two outer arc edge sections and two inner arc edge sections, the two outer arc edge sections and the two inner arc edge sections are connected between the two gasket body straight edge sections, the two outer arc edge sections are arranged at the two ends of the two gasket body straight edge sections, and the two inner arc edge sections are arranged on the inner sides of the two outer arc edge sections and do not make contact with the outer arc edge sections. The inner ring radius of the inner arc edge section is larger than the inner ring radius of the outer arc edge section, when the pipe diameter of the pipeline has negative tolerance, sealing can be achieved through the outer arc edge section, when the pipe diameter of the pipeline is standard, the outer arc edge section is excessively compressed, the inner arc edge section is normally compressed, and the overall internal stress of the outer arc edge section and the inner arc edge section is improved. The sealing performance of the sealing gasket can be prevented from being sharply reduced, and the service life is prolonged.

The utility model discloses a thermal expansion and cold contraction compensation device for a steel plate silo, which belongs to the technical field of steel plate silos and comprises a mounting seat, a silo body arranged on the mounting seat, a plurality of connecting blocks fixedly connected onto the mounting seat, motors arranged inside the connecting blocks, lead screws connected onto transmission ends of the motors and rotatably connected inside the connecting blocks. A guide rod is slidably connected into the connecting block, extends into the placement base and is connected with a limiting block. The motor, the lead screw, the guide rod and the limiting block are arranged, the motor can be powered on according to actual conditions, the motor drives the lead screw to rotate together and then drives the guide rod to move back and forth, and the guide rod drives the limiting block to move together until the limiting assembly just abuts against the outer wall of the bin body. Therefore, when the bin body expands with heat and contracts with cold due to temperature, the limiting assemblies on the outer side of the bin body can synchronously move and always limit and abut against the bin body, large internal stress generated due to limitation of a bin body steel plate is reduced, and deformation of the bin body is avoided.

The invention discloses a packaging structure and method of an image sensor, and belongs to the technical field of semiconductor packaging. The packaging structure comprises a sensor wafer, a light-transmitting cover plate, a retaining wall, a packaging layer, a rewiring layer, a silicon through hole and a solder ball. The encapsulating layer wraps the side wall of the light-transmitting cover plate, the side wall of the retaining wall and the side wall of the chip, the upper surface of the encapsulating layer is flush with or slightly lower than the upper surface of the light-transmitting cover plate, and a low-moisture-absorption-rate material is adopted to prevent water vapor from invading the cavity and enhance the mechanical strength. The packaging method mainly comprises the following steps: manufacturing a retaining wall on a cover plate wafer; bonding with a sensor wafer to form a cavity; thinning is carried out; cutting to form a prefabricated module; carrying out encapsulation treatment; manufacturing a TSV, an RDL and a solder ball; and finally cutting. By means of the innovative packaging structure and method, the advantages of low cost and high efficiency of wafer-level packaging are kept, meanwhile, the packaging reliability is remarkably improved, and the packaging structure can meet the requirements of high-end application such as vehicle gauge level application and the like.

The utility model discloses an installation structure of a rear penetrating tail lamp, and relates to the technical field of automobile lamps, the installation structure of the rear penetrating tail lamp comprises a back door plate assembly, a lamp body, a buckle assembly and a fastening assembly, the back door plate assembly is provided with a boss, the lamp body is provided with a limiting groove, a first sliding groove and a second sliding groove, the groove wall of the limiting groove abuts against the boss, the buckle assembly is in sliding fit with the first sliding groove, and the fastening assembly is in sliding fit with the second sliding groove. According to the technical scheme, the boss and the limiting groove are adopted to achieve positioning of the lamp body in the left-right direction, internal stress generated by installation accuracy difference can be reduced through tiny relative displacement of the boss and the limiting groove in the up-down direction, and the clamping buckle assembly and the fastening assembly are adopted so that the lamp body can be firmly fixed when thermal expansion and cold contraction happen. The buckle assembly and the sliding groove bolt can generate tiny relative displacement relative to the lamp body in the left-right direction, so that the internal stress is greatly reduced, and the lamp body is prevented from cracking.

The invention discloses a cam, a damping device and a vehicle, and belongs to the technical field of vehicles. The cam is an equal-width cam, the base circle radius of the cam is Ra, the extending stroke of the cam is h, and Ra is larger than or equal to 0.4 * h; wherein the extending stroke is the movement limit of the cam.

This specification provides a polishing apparatus, comprising: a first rotating member configured to drive a workpiece to rotate; a housing defining a polishing chamber configured to contain a polishing medium; wherein the workpiece is located within the polishing chamber, immersed in the polishing medium, and driven to rotate relative to the polishing medium by the first rotating member.