JPH0180213U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a pipe bender equipped with a bending head lifting device which is an embodiment of the present invention. 2 is a longitudinal sectional view of the bending head of the pipe bender of FIG. 1; FIG. FIG. 3 is a partially cutaway front view of the bending head lifting device provided in the pipe bender of FIG. 1. 4 is a longitudinal sectional view of the bending head lifting device of FIG. 3; FIG. FIG. 5 is a sectional view showing the tip of the output rod of the drive cylinder in the bending head lifting device of FIG. 3. FIG. 6th
3 is a partially cutaway front view showing different operating states of the bending head lifting device of FIG. 3; FIG. 14: Bending head, 30: Pipe, 34, 36
: Bending mold, 38: Clamp device, 56: Bending head lifting device, 60: Slide member, 62: Guide plate (guide member), 64: Mounting base, 7
6: link mechanism, 78: intermediate pin, 80: first link, 82: second link, 84: first pin, 86
: 2nd pin, 90: Drive cylinder, 98: Stopper bolt (first stopper), 110: Stopper bolt (second stopper), A, B: Bending part, l
: A line segment connecting the first pin and the second pin.

Claims (1)

[Scope of Claim for Utility Model Registration] Two types of bending molds with different diameters are provided approximately horizontally on the same center line in two stages, upper and lower, and a clamping device for clamping a pipe is provided on the outer periphery of each of the bending molds. The pipe is rotated around the center line while being clamped by the clamp device, so that the pipe has two different bending diameters.
In a pipe bender equipped with a bending head that selectively performs different types of bending, in order to convert the bending diameter, two bending sections using the two types of bending dies are placed at a height at which the pipe is fed. A bending head lifting device that raises and lowers the bending head to two positions, an upper position and a lower position, so that the bending head can be selectively positioned, the mounting base being disposed immovably in the vertical direction; a slide member that is disposed on a mounting base and to which the bending head is fixed; a guide member that guides the slide member so that the bending head is moved up and down to the two positions; comprising a pair of first links and second links connected so as to be relatively rotatable;
The first link is rotatably connected to the slide member via a first pin, while the second link is connected via a second pin below the first pin in the moving direction of the slide member. is rotatably connected to the mounting base, and the bending head is positioned at the upper position when the slide member is raised until the intermediate pin is located on a line connecting the first pin and the second pin. a link mechanism that lowers the slide member as the first link and the second link rotate and the intermediate pin moves away from the line; a drive cylinder that rotates the first link and the second link when the first link and the second link are rotated by the drive cylinder until the intermediate pin is positioned on the line segment; a first stopper that prevents further rotation of the link; and the drive cylinder rotates the first link and the second link in a direction in which the intermediate pin is separated from the line segment, and the bending A bending head lifting device for a pipe bender, comprising: a second stopper that prevents the slide member from further lowering when the slide member is lowered until the head reaches the lower position.