Abstract: A damper has a shell with a cavity. A rotating shaft is rotatably inserted into the cavity of the shell, the portion of the rotating shaft located in the cavity is provided with external thread; a guiding sleeve with internal thread can move along axially reciprocatingly to attach to the shell cavity, and the internal thread and the male thread of the rotating shaft are screwed together; A guiding structure is provided in the shell cavity. The guiding sleeve is engaged or disengaged with the guiding structure by axial movement, and when the two are disengaged, the guiding sleeve can rotate with the rotating shaft. The guiding sleeve is provided with a one-way valve passage. The one-way valve passage opens when the guiding sleeve is axially disengaged with the guiding structure. When the guiding sleeve moves axially in the reverse direction, the one-way valve passage is closed.

Abstract: A rotary damper with self-repairing against attenuation, comprising a housing, a rotating shaft, and blades. The blades connect with the rotating shaft and comprise a driving structure. When the rotating shaft rotates towards a direction of forming damping, the driving force is applied on the drive structure by the damping oil. The blade is driven by the drive structure and elastically deforms the blades and extends outwardly to tightly attach to an inner wall of the housing. When the damping is formed, a downward pulling force is applied on the blades by the damping oil, and the blade drives the rotating shaft downward to tightly attach the bottom of the housing to generate a self-locking force. Furthermore, the damping oil flowing through the rotating shaft and the bottom of the housing can be reduced, to achieve a more stable damping effect.

Abstract: A damper has a shell with a cavity. A rotating shaft is rotatably inserted into the cavity of the shell, the portion of the rotating shaft located in the cavity is provided with external thread; a guiding sleeve with internal thread can move along axially reciprocatingly to attach to the shell cavity, and the internal thread and the male thread of the rotating shaft are screwed together; A guiding structure is provided in the shell cavity. The guiding sleeve is engaged or disengaged with the guiding structure by axial movement, and when the two are disengaged, the guiding sleeve can rotate with the rotating shaft. The guiding sleeve is provided with a one-way valve passage. The one-way valve passage opens when the guiding sleeve is axially disengaged with the guiding structure. When the guiding sleeve moves axially in the reverse direction, the one-way valve passage is closed.

Abstract: A damping spindle mechanism includes a spindle, a sleeve, a housing and a blade. The sleeve is coupled to the spindle; the housing is disposed with a chamber, one section of the spindle threaded with the sleeve is assembled in the chamber of the housing to form a closed chamber; the close chamber is filled with damping oil and is separated to a first chamber body and a second chamber body by the sleeve; the sleeve is disposed with a first passage connecting the two chamber bodies in the axial direction; wherein the blade is of ring shape or arc shape coupled to the internal wall surface of the housing, the blade is disposed with a deformable first thin wall. When the blade moves towards the second chamber body, the first thin wall deforms towards the internal wall surface of the housing.

Abstract: A damping shaft mechanism has a spiral shaft, spiral guide bush, a shell and blade. An external spiral structure is arranged at one end of the spiral shaft, and its core has a cone segment. An internal spiral structure is arranged in the spiral guide bush, which cooperates rotationally with the external spiral structure so that it can move along the axis relative to the spiral shaft when the spiral shaft is rotating. The two cavities change size by moving the spiral guide bush driven by the spiral shaft in the shell, and the taper on the spiral shaft makes the fit clearance between the spiral shaft and the spiral guide bush changed from maximum to minimum gradually in the damping process, so that the oil-flowing section between the two cavities changes from big to small.

Abstract: A damping shaft mechanism has a spiral shaft, spiral guide bush, a shell and blade. An external spiral structure is arranged at one end of the spiral shaft, and its core has a cone segment. An internal spiral structure is arranged in the spiral guide bush, which cooperates rotationally with the external spiral structure so that it can move along the axis relative to the spiral shaft when the spiral shaft is rotating. The two cavities change size by moving the spiral guide bush driven by the spiral shaft in the shell, and the taper on the spiral shaft makes the fit clearance between the spiral shaft and the spiral guide bush changed from maximum to minimum gradually in the damping process, so that the oil-flowing section between the two cavities changes from big to small.

Abstract: An injection method for hollow products, a fusible core and the method for making the fusible core comprises putting a fusible Sn—Bi alloy core into a mold core, then both the product and the fusible core are taken out from the die. The fusible core is turned from solid to liquid state and is apart from the product. The inner wall of the core can be made using this method, and the plastic product can be with more shape in one-step molding to replace the metal in many fields. Complex core-pulling mechanism is not needed, thus the core structure is simplified, and the shape of die can be simplified. The fusible core is not needed to be maintenance for it will not be worn, because after each injection, the fusible core is recycled to make a new fusible core.