Abstract: A method for preparing Mg-RE alloys with high strength and ductility using selective laser melting (SLM) additive manufacturing technology includes the following steps of: A. preparing Mg-RE-(Zn)—Zr pre-alloyed spherical powder by gas atomization; B. molding the Mg-RE-(Zn)—Zr pre-alloyed spherical powder using SLM to obtain the Mg-RE alloys with high strength and ductility; and C. conducting heat treatment on the Mg-RE alloys prepared in step B: solid solution+aging treatment or only aging treatment The method adjusts and controls microstructure and mechanical properties of the alloys by adjusting and controlling process parameters of SLM (laser power, scanning speed, hatch spacing, spot diameter, layer thickness, interlayer rotation angle, substrate preheating temperature, partition width and overlapping area width) and process parameters of subsequent heat treatment (temperature and time) to prepare the Mg-RE-(Zn)—Zr alloys with high strength and ductility using SLM process for the first time.

Abstract: The disclosure relates to an omni-directional horizontally oriented deflecting tool for a coiled tubing, which includes an inner central pipe, an outer central pipe, a conical outer cylinder, a piston outer cylinder, an anchoring mechanism, a sealing mechanism, a reversing mechanism and a steering mechanism. The anchoring mechanism includes a cone, an O-shaped sealing ring I, a cone spring, a slip, a slip spring, a slip seat, a claw I and a pin shaft I, and the sealing mechanism includes a piston, an O-shaped sealing ring II, a claw II, a pin shaft II, an upper rubber cylinder seat, a rubber cylinder, a connecting cylinder, a lower rubber cylinder seat and a gasket.

Abstract: A pile pouring structure includes a steel reinforcement cage, a limiting ring arranged on the outer side of the steel reinforcement cage, a plurality of PVC pipes arranged in the steel reinforcement cage, a cut-off layer arranged on the limiting ring, a two-dimensional code display board arranged in one-to-one correspondence with the steel reinforcement cage, the cut-off layer is annular. The two-dimensional code display board is provided with a two-dimensional code which is scanned to enter an information input interface. Information management is achieved in the pile construction process by scanning the two-dimensional code for inputting pile body strength information, thereby improving the work efficiency. The cut-off layer is used as an interface between a pile body and a pile head so that a part needing to be broken is rapidly positioned. The pile head at a part above the cut-off layer is broken so that the cut-off layer is capable of protecting a lower structure.

Abstract: Disclosed is an electromagnetic fountain pen, which includes a pen core, a housing, and a pen body located in the housing, the housing includes a front housing and a rear housing, the pen body includes a first iron core and an iron core holder, the iron core holder is provided with a pen core clamp link, a second iron core, and a third iron core, coils are wound outside the first iron core and the second iron core, the first iron core is close to a pen tip of the pen core, the pen core is configured to pass through a center of the first iron core, and then is clamped by one end of the pen core clamp link.

Abstract: Disclosed is a passive electromagnetic fountain pen, which includes a pen core and a pen body, wherein the pen body includes a first iron core and an iron core holder, a pen core clamp link, a second iron core, a third iron core, an elastic component, a pressure regulating plate, and a first structure matched with the pressure regulating plate are disposed sequentially from front to back in the iron core holder, coils are wound outside the first iron core and the second iron core, the first iron core is close to a pen tip of the pen core, the second iron core is fixedly connected with the iron core holder, the pen core is configured to pass through a center of the first iron core, and then be clamped by one end of the pen core clamp link.

Abstract: Disclosed is a passive electromagnetic pen, which includes a pen core, a first iron core, and an iron core holder, wherein a coil is wound outside the first iron core, the first iron core is fixed to an end of the iron core holder close to a pen tip of the pen core, a second iron core, an elastic component, a pressure regulating plate, and a first structure matched with the pressure regulating plate are disposed in the iron core holder sequentially from front to back, and the pen core is configured to pass through a center of the first iron core, and then drive the second iron core to move; and the pressure regulating plate when in rotation is configured to be in surface contact with the first structure by a surface, so as to generate an axial displacement to change an axial displacement of the elastic opponent.

Abstract: Disclosed is an electromagnetic pen, including a housing and a pen body located in the housing, the housing includes a front housing and a rear housing, the pen body includes a pen core, a first iron core, an iron core holder, and a PCBA circuit board, a coil is wound outside the first iron core, the first iron core is fixed at an end of the iron core holder close to a pen tip of the pen core, a second iron core is disposed in the iron core holder, and the pen core is configured to pass through a center of the first iron core, and then drive the second iron core to move; and an elastic structure is disposed between the PCBA circuit board and the iron core holder, a clamping slot is disposed on the PCBA circuit board.

Abstract: Disclosed is an electromagnetic fountain pen, which includes a pen core, a housing, and a pen body located in the housing, the housing includes a front housing and a rear housing, the pen body includes a first iron core and an iron core holder, the iron core holder is provided with a pen core clamp link, a second iron core, and a third iron core, coils are wound outside the first iron core and the second iron core, the first iron core is close to a pen tip of the pen core, the pen core is configured to pass through a center of the first iron core, and then is clamped by one end of the pen core clamp link.

Abstract: Disclosed is a passive electromagnetic fountain pen, which includes a pen core and a pen body, wherein the pen body includes a first iron core and an iron core holder, a pen core clamp link, a second iron core, a third iron core, an elastic component, a pressure regulating plate, and a first structure matched with the pressure regulating plate are disposed sequentially from front to back in the iron core holder, coils are wound outside the first iron core and the second iron core, the first iron core is close to a pen tip of the pen core, the second iron core is fixedly connected with the iron core holder, the pen core is configured to pass through a center of the first iron core, and then be clamped by one end of the pen core clamp link.

Abstract: Disclosed is a passive electromagnetic pen, which includes a pen core, a first iron core, and an iron core holder, wherein a coil is wound outside the first iron core, the first iron core is fixed to an end of the iron core holder close to a pen tip of the pen core, a second iron core, an elastic component, a pressure regulating plate, and a first structure matched with the pressure regulating plate are disposed in the iron core holder sequentially from front to back, and the pen core is configured to pass through a center of the first iron core, and then drive the second iron core to move; and the pressure regulating plate when in rotation is configured to be in surface contact with the first structure by a surface, so as to generate an axial displacement to change an axial displacement of the elastic opponent.