45results about How to "Does not affect fixation" patented technology

The invention discloses a method for processing a hinge seat of a civil air defense door, which comprises a core layer, a protective layer and a stable layer. The present invention improves the steel casting process. By controlling the thickness of the coating material, dry quartz sand without adhesives and additives is selected, and a double-structure sand box is used to set air holes and leakage nets to prevent gravel from entering the vacuum chamber. Guarantee the grasp of the gas tension scale during casting, and then improve the characteristics of the steel, so that the steel can reduce the porosity defects in the pouring process, improve the quality of the steel material, fundamentally improve the quality of the core layer steel, and ensure the stability of the steel. The protective layer ensures that the core layer still plays a fixed role after the cracked state. The outer periphery of the flexible layer is protected by a strong material, which again ensures the solid performance of the door hinge seat, improves safety and is easy to install and use, and adds a stable layer to the door hinge seat. Perform further base stabilization to further strengthen the combination between the door hinge seat and the wall.

The invention relates to a fixing device for circuit board welding, more specifically a chip main board processing system, the device can be placed on the corresponding position of the workbench according to the position of the main board to be welded, when the position of the main board needs to be adjusted, directly Just adjust the position of the workbench. The lower end of the workbench is connected with a rotating shaft structure. The relative position of the workbench can be flexibly adjusted by using the rotating shaft structure. Each clamping mechanism is connected with the workbench. The position adjustment of the workbench will not affect each clamp The fixing effect of the holding mechanism on the main board, and then achieve the purpose of flexibly adjusting the position of the main board according to the welding habits and welding needs of the staff, and then improve the comfort and work efficiency of the staff when welding.

The invention provides a riveting nut which is provided with a nut body. The inner wall of the nut body is provided with an internal screw thread; the riveting nut also comprises a connecting part; a first end of the connecting part is fixed on the nut body; the connecting part is of a spiral shape; the connecting part extends along the axial direction of the nut body; the riveting nut is also provided with a fixing part; the fixing part comprises a fixing plate and a positioning ring positioned on one end face of the fixing plate; a second end of the connecting part is fixed on the positioning ring; and the fixing part is provided with a through hole running through the fixing plate and the positioning ring. The riveting nut provided by the invention can be conveniently arranged on a board which is inconvenient to place a common nut, is firmly connected with a bolt and is difficult to fall off.

Disclosed are a combined type light lifting apparatus and a method for using same. The combined type lifting apparatus comprises four lifting machines, a hydraulic system and a control device. The lifting machines are provided with inverted oil pumps and are symmetrically placed at the four corners to form a rectangle. Hydraulic oil cylinders (23) of the lifting machine oil pumps are connected to the hydraulic system, and the hydraulic system is electrically connected to the control device. The combined type lifting apparatus adopts a split structure and is convenient to transport, field assembly is facilitated, the oil pumps can be examined conveniently, and parts can be replaced conveniently, and an operator can move the combined type lifting apparatus conveniently; the combined type lifting apparatus is simple in structure, small in size and flexible and convenient to use.

The invention relates to the technical field of test pile tests, and discloses a double-pile casing structure facilitating test pile tests. The double-pile casing structure comprises an inner pile casing arranged on the outer surface of a cast-in-place pile in a sleeving mode, and an outer pile casing arranged on the outer circumference of the inner pile casing; annular spacer area is defined between the outer pile casing and the inner pile casing; the upper portion of the spacer area is provided with an upper opening; the lower portion of the spacer area is provided with a lower opening; thelower portion of the spacer area is provided with a lower closing structure; the lower closing structure closes the lower opening of the spacer area; the upper portion of the spacer area is provided with an upper closing structure; the upper closing structure closes the upper opening of the spacer area; an isolation block is arranged on the outer surface of the inner pile casing in a protruding mode; and a gap is formed between the isolation block and the inner surface of the outer pile casing. By arranging the isolation block, on the one hand, the gap between the inner pile casing and the outer pile casing can be controlled, on the one hand, the inner pile casing and the outer pile casing can be fixed, thus, the stability between the inner pile casing and the outer pile casing in the construction process is ensured, and the structure has high practicability.