Abstract: An ultrasonic welding machine, which is configured as: driving a triple assembly (2) to move in a Z direction by a multi-position cylinder (4) disposed on the ultrasonic welding machine, so as to achieve graded down pressing of a welding head (21) to prevent the workpiece to be welded from damage caused by possible situations where the welding head (21) first moves to a working position while a welding seat (3) has not reached a supporting position, which is due to the inability to strictly control the order of arrival at the working position of the welding head (21) and the welding seat (3) when the welding head (21) and the welding seat (3) move towards the working position simultaneously. An ultrasonic welding method is further related. The welding method using the ultrasonic welding machine significantly improves efficiency while ensuring welding quality.

Abstract: The objective of the present invention is to provide a welding head assembly that can meet various welding requirements. The welding head assembly for ultrasonic welding to realize the objective mentioned above, comprising an acoustic rod, a vibrating rod and a connecting member, the vibrating rod is separated into two pieces, thereby separated into a first vibrating rod and a second vibrating rod by the acoustic rod, the first vibrating rod is connected with the acoustic rod and the connecting member, one end of the second vibrating rod is connected with the acoustic rod, and the other end of the second vibrating rod is configured to be a welding head working portion; wherein, the acoustic rod, the first vibrating rod and the connecting member are integrally formed as one piece.

Abstract: Disclosed is a lanthanum doping catalyst for preparing carbon nanotubes having uniform diameter and producing method thereof. The catalyst comprises magnesium oxide as a support, two or three metal oxides selected from the group consisting of ferric oxide, cobalt oxide, and nickel oxide as a complex metal oxide composite, lanthanum oxide as a lanthanum doping composite, and molybdenum oxide as an enhanced catalytic composite. The catalyst is produced by dissolving magnesium salt into distilled water, and into the solution is added metal salt for forming complex metal oxide composite, lanthanum salt for forming lanthanum doping composite and salt for forming enhanced catalytic composite in a molar ratio of 0.5-3.0:0.1-1.0:0.01-1.0:0.5-3.0. The solution is dissolved completely and dried at 120-200° C. for 3-5 hours. Then, the product is calcinated at 550-850° C. for 10-30 minutes and grind to be a fine powder.