Pipe expansion mechanism and pipe expansion machine thereof

Abstract

A pipe expansion mechanism comprises a power base, supports, a machine top base, a motor and transmission system, ball screws, lead screw nuts, an expansion rod installation assembly and two sets of expansion rods. The lower ends of the two supports are installed on the power base. The machine top base is fixed to the upper ends of the supports. The upper ends of the ball screws are supported by the machine top base, and the lower ends of the ball screws are supported by the power base. The motor and transmission system is installed on the machine top base. A motor drives the ball screws to rotate through a transmission system. The lead screw nuts are fixed to the two ends of the expansion rod installation assembly. The lead screw nuts are arranged outside the ball screws in a penetrating and sleeving manner. One set of expansion rods are installed on the expansion rod installation assembly and penetrate the power base. The motor drives the two ball screws to rotate through the transmission system so that the lead screw nuts and the expansion rod installation assembly can be driven to move up and down. The other set of expansion rods are installed on the power base and parallel to the previous set of expansion rods. The invention further correspondingly provides a pipe expansion machine. The pipe expansion mechanism can be suitable for multiple sets of pipe expansion workpieces with height differences, and can be conveniently adjusted for the pipe expansion workpieces with different height differences.

Description

technical field [0001] The invention relates to a tube expander of a tube expander, in particular to a tube expander used for heat exchanger workpieces with high and low metal tubes. Background technique [0002] Existing tube expanders see Figure 5 , which includes a frame 20, a power base 1, a power base driving mechanism, and an expansion rod 10, the power base 1 and the power base driving mechanism are supported by the frame 20, the power base 1 is fixed with an expansion rod 10, and the power base driving mechanism drives the power base 1 moves up and down, thereby driving the expansion rod 10 to move up and down, so that the expansion rod enters and leaves the workpiece to be expanded, thereby completing the tube expansion of the workpiece fixed under the expansion rod. When expanding the tube, the expansion rod is driven down to expand the tube as the power seat descends. [0003] For multiple rows of workpieces of different lengths, such as figure 1 with 2 As sh...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, if the second row of workpieces to be expanded is a workpiece with an upper height difference, although the height of the two rows of expansion rods can be unified, the expansion rods cannot enter the nozzle of the workpiece at the same time, which will easily cause the workpiece to bend and be scrapped; figure 2 As shown, if it is a workpiece with a lower height difference, the expansion rod must also be made to have a height difference, so the height difference of the expansion rod is determined according to the height difference of the workpiece and is fixed. When changing to another type, only the height difference is different For the same workpiece, the specifications of the expansion rods have to be changed, resulting in various specifications of the expansion rods, which is inconvenient for mass production, and the replacement and disassembly of the expansion rods is also time-consuming and laborious.

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