2results about How to "Uniform inner diameter" patented technology

This utility model discloses a leaf collection vehicle, relating to the field of urban sanitation technology. The vehicle includes a vehicle body equipped with a negative pressure trash can, a leaf collection device, a leaf collection device fixing mechanism, and a sweeping device. The leaf collection device includes a suction port, which comprises a housing and a suction port insert. The housing has a suction channel extending vertically upwards from the bottom of the housing. The bottom of the suction channel has a bottom opening, and a suction port is located on the side of the suction channel near the bottom. The bottom opening connects to and is through the suction port. A suction port insert is located at the suction port, and the insert can move towards the suction port to cover it and move away from it to expose it. The suction port can change size using its shape and structure to prevent clogging. Using this leaf collection vehicle greatly improves the efficiency of sweeping up lightly littered objects such as leaves and branches.

The present invention discloses a tube drawing device for a threaded tube, comprising a first chuck, a second chuck, several groups of roller assemblies and a fixing member. The circumferential outer walls of the rollers of the several groups of roller assemblies enclose a cavity connected to a first through hole; when the front end of the fixing member away from the second chuck slides into the cavity with the second chuck, a rolling area at a starting position is formed between the fixing member and the rollers. Since the tube drawing device does not provide a liner core and a core head to support the inner wall of the tube, no defects such as friction marks or scratches will be formed on the inner wall of the tube during the tube drawing process; when the roller rolls the thread at the starting position of the tube, since the front end of the fixing member extends into the cavity to support the inner wall of the tube at the starting position of rolling the thread, when the roller rolls the tube at the starting position of forming the thread, the phenomenon of the inner diameter of the tube being instantly reduced is avoided; so that the inner diameter size of the pulled threaded tube at different positions is uniform.