Abstract: Disclosed is a tool bar. The tool bar comprises a head part, a tail part, a pipe connection assembly, a backstop mechanism and a bushing member. The head part and the tail part are connected with each other by the pipe connection assembly. The bushing comprises a cone section and a cylinder section; one end of the head part passes through the cylinder section and connected to an inner thread of the cone section; the outer side of the cone section is configured to secure with a tool head; an external thread is provided on an outer surface of the cylinder section. The backstop mechanism comprises an intermediate member and a lock cap; the intermediate member is a hollow cylinder.

Abstract: The present invention discloses a targeted exosome based on the RBD region of SARS-CoV-2 S protein and a preparation method thereof. An RBD-VSVG fusion protein is expressed on the targeted exosome of the present invention, and the RBD-VSVG fusion protein is obtained by replacing the extracellular region of VSVG with the RBD of the SARS-CoV-2 S protein. In the present invention, a targeted exosome capable of efficiently and tissue-specifically delivering a potential anti-SARS-CoV-2 medicine is constructed. The targeted exosome is used to encapsulate SARS-CoV-2 siRNA, to specifically inhibit the virus replication in tissues and organs. In a mouse animal model, tail vein injection of exosome encapsulated SARS-CoV-2 siRNA significantly inhibits virus replication in mouse lung tissue and alleviates symptoms such as pneumonia caused by virus infection.

Abstract: Disclosed is a tool bar. The tool bar comprises a head part, a tail part, a pipe connection assembly, a backstop mechanism and a bushing member. The head part and the tail part are connected with each other by the pipe connection assembly. The bushing comprises a cone section and a cylinder section; one end of the head part passes through the cylinder section and connected to an inner thread of the cone section; the outer side of the cone section is configured to secure with a tool head; an external thread is provided on an outer surface of the cylinder section. The backstop mechanism comprises an intermediate member and a lock cap; the intermediate member is a hollow cylinder.

Abstract: This invention is generally directed to a new metal parts quenching medium recycling apparatus. This device is composed of a heating furnace, a spray rinsing chamber, a immersion cleaning tank, a washing chamber, a liquid storage tank, a quenching chamber and a molten and mixing tank. At one side of a thermal insulation door, a liquid transportation pipeline is connected with the circulation pump that is installed in the liquid storage tank; at another side of the thermal insulation door, a pipeline that transports the spray rinsing water is connected with the spray rinsing chamber. In present invention, the recovering and recycling of quenching media is carried out automatically in the molten and mixing tank, providing a minimized workload and safely procedure to recover and recycle the quenching media. This procedure eliminates both the loss of the quenching media, and the related environmental pollution.

Abstract: This invention is generally directed to a new metal parts quenching medium recycling apparatus. This device is composed of a heating furnace, a spray rinsing chamber, an immersion cleaning tank, a washing chamber, a liquid storage tank, a quenching chamber and a molten and mixing tank, in present invention, the recovering and recycling of quenching medium is carried out automatically in the molten and mixing tank, providing a minimized workload and safely procedure to recover and recycle the quenching medium. This procedure eliminates both the loss of the quenching medium, and the related environmental pollution.