4 results about "Large elbow" patented technology

The invention relates to an argon arc welding seam welding method for a lock bottom butt joint with a thermal barrier coating. The argon arc welding seam welding method comprises the following steps that S1, a welding seam joint is machined, specifically, a first groove is machined in a lock bottom at the mounting edge of the inner wall of a large bent pipe to be welded, a truncated edge is reserved, a second groove is machined in the mounting edge of the outer wall of the large bent pipe, and a truncated edge is reserved; the inner wall of the large elbow pipe and the outer wall of the large elbow pipe are combined, the lock bottom of the inner wall of the large elbow pipe is aligned with the mounting edge of the outer wall of the large elbow pipe, and the gap of the to-be-welded position is smaller than or equal to a first threshold value; s2, first-layer backing welding is carried out, during welding, welding wires are not filled, the truncated edge is directly penetrated in a penetration mode, and the step S3 is carried out after cooling; and S3, second-layer cosmetic welding is conducted, the first groove and the second groove are filled with welding wires, and then welding is conducted. According to the method, the welding quality can be guaranteed, heat input during welding can be obviously reduced, the coating is effectively prevented from falling off, and therefore the service life of the aero-engine large elbow is prolonged.

The utility model relates to the technical field of bent pipe welding auxiliary positioning tools, in particular to an adjustable positioning mechanism for a large bent pipe, which comprises an angle adjusting part, a hinged bracket part, a mounting bearing part and a clamping positioning assembly, the hinged bracket part is mounted on external transposition equipment; the whole hinging bracket part is of a U-shaped frame structure; the angle adjusting part is arranged on the outer side face of the hinged bracket part and connected with the hinged bracket part. A mounting bearing part which is adaptive to placement of the bent pipe is arranged in the hinged bracket part; in the specific use process, clamping positioning and angle adjusting can be conducted on the large elbow through the synergistic effect of the angle adjusting part, the hinge bracket part, the installation bearing part, the clamping positioning assembly and other components, and the auxiliary positioning requirement for the large elbow is met.

The utility model relates to the technical field of polishing machines, in particular to a full-automatic bent pipe polishing machine which comprises a machine body and a cylinder, and the cylinder is rotationally installed on the inner side wall of the machine body. The circular track and the conducting ring are arranged on the outer side wall of the cylinder, the carbon brush is installed on the inner side wall of the machine body and makes friction contact with the conducting ring, the cylinder is provided with a plurality of sets of grinding mechanisms, and the grinding mechanisms are used for polishing the bent pipe. A driving device is arranged on the machine body and used for driving the cylinder to rotate, and a conveying device is arranged on the side portion of the machine body and used for automatically conveying the bent pipe. According to the elbow pipe polishing device, polishing machining in the elbow pipe moving and conveying process is achieved, the effect of polishing different positions of the surface of the elbow pipe under the condition that the elbow pipe does not rotate is achieved, the convenience of polishing treatment machining of the large elbow pipe is improved, and meanwhile the convenience of automatic conveying of the elbow pipe is improved.

The application discloses a connecting structure of a large elbow pipe, which is applied to a backflow combustion chamber of an aero-engine and comprises a diffuser assembly and a large elbow pipe installed on an outer ring of a flame tube. The large elbow pipe comprises a front section and a rear section. The rear section comprises an inner wall and an outer wall. The end of the front section extends axially towards the combustion chamber side of the diffuser assembly and is provided with a first connecting structure. The end of the inner wall extends axially towards the combustion chamber side of the diffuser assembly and is provided with a second connecting structure for active sealing connection with the first connecting structure. The outer wall is movably inserted into the second connecting structure. The diffuser assembly is provided with a limiting structure for active limiting connection with the second connecting structure. The large elbow pipe is connected through axial lapping and radial sealing, which facilitates stress release of the large elbow pipe, reduces deformation of the large elbow pipe, prolongs the service life of the large elbow pipe, improves air tightness and enhances the cooling effect.