JPH028805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe bending device, and more particularly to a pipe bending device that performs step bending.

Step bending is, as shown in Figure 1,
A straight pipe 10 is bent so as to have parallel parts 10a, 10b and a curved step 10c between them.

This step bending is required during piping work.

Conventionally, such step bending is performed by bending a straight pipe twice in the forward direction and in the opposite direction as shown by arrows A and B in FIG. However, each bending process requires dimension entry, bending dimension measurement, dimension correction,
There was a problem in that it required many processes such as parallelism correction, and it was difficult to manufacture products with the same shape and dimensions.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe bending device that can solve the problems of the prior art and efficiently perform step bending with excellent dimensional accuracy.

In order to achieve this object, the present invention connects a fixed base and a movable base, each of which is provided with a pressing tool for bending a pipe along its outer periphery, with a parallel link, and The movable table is moved in the pipe bending direction while being held parallel to the pipe to perform step bending of the pipe.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view of the pipe bending device according to the embodiment of the present invention, showing the state immediately before the end of the bending operation.

In FIG. 2, 20 is a fixed base, and 22 is a movable base connected to the fixed base 20 via a parallel link 24. The fixed base 20 includes a first roller 26 for bending the pipe along its outer periphery, and a first roller 26 for bending the pipe 1 along its outer periphery.
A stopper 28 for locking 0 and a scale plate 30
and is provided. In the figure, 25a to 25d are pins for pivotally connecting the parallel ring 24. In addition, pin 25d
also serves as a pivot support for the second roller 32.

Further, the movable table 22 is provided with a second roller 32 for bending the pipe 10 along the outer circumference, a third roller 34 for locking the pipe 10, and an indicator 36 for reading the amount of bending of the pipe. There is. In the figure, reference numeral 38 denotes a lever for moving the movable base 22, one end of which is pivoted to the fixed base 20 to serve as a fulcrum, and the middle part connected to the movable base 22 via a connector 40 to serve as a point of action. ing. The connecting portions 40a and 40b of this connecting tool 40 are each made into a pivot portion.

Next, the operation of the apparatus of this embodiment will be explained with reference to FIGS. 3 to 7.

FIG. 3 shows a state in which the lever 38 has been rotated to the opening side (in the direction of arrow c), and shows a state before the bendable pipe is placed. In this state, as shown in FIG. 4, the straight pipe 10 is placed between the stopper 28 and the first roller 26 and between the second roller 32 and the third roller 34. The lever 38 is then turned on as shown in FIG.
is rotated in the direction of arrow D, and the pipe 10 is sandwiched between the stopper 28, the first roller 26, the second roller 32, and the third roller 34. Then the 6th
As shown in the figure, the lever 38 is further rotated in the direction of the arrow E, the movable base 22 is moved in the direction of the arrow F, and the pipe 10 is bent along the outer periphery of the first roller 26 and the second roller 32. And indicator 3
While reading the position of the scale plate 30 indicated by 6, the pipe 10 is bent by rotating the lever 38 in the direction of the arrow E to a predetermined dimension. Once the bend has been made to the planned dimension, the lever 38 is released as shown in FIG.
Open it in the direction of arrow G and take out the pipe 10.

In the apparatus of this embodiment, as shown in FIG.
The straight pipe portion 10b held by the second and third rollers 34
The stopper 28 and the rollers 26, 32, and 34 are arranged so that the pipes are always kept parallel during the bending operation, and the parallelism of the pipe is extremely excellent. Furthermore, since the pipe 10 is always bent along the outer periphery of the first roller 26 and the second roller 32,
The deformed shape of the pipe is made constant. Furthermore, by performing the bending operation while reading the scale, the amount of deformation (step) width S (see Figure 2) can be easily made constant, and one bending operation is sufficient.
A large amount of pipe can be efficiently step bent in a single hour. As a result of the inventors' experiments using the apparatus of this embodiment, it took 3 to 10 seconds to bend one pipe. On the other hand, the conventional method of bending twice takes 1.5 to 3 minutes.

Further, as shown in FIG. 8, the second roller 3
The portion bent along 2 is the first roller 26
On the involute line L of the pipe 10 bent along, the second roller 3 is always moved from the normal direction.
2 presses, the bending accuracy becomes extremely accurate and deformation and flaws are prevented from occurring.
In FIG. 8, 1 to 7 are the loci of the center point of the second roller 32, and 1' to 7' are the loci of the contact point I.

Further, by rotating and loosening the lever 38, the pipe can be easily taken in and taken out.

As described above, according to the pipe bending device of the present invention,
Step bending of pipes can be performed accurately and efficiently.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of step bending, FIG. 2 is a plan view of a pipe bending device according to an embodiment of the present invention, and FIG.
7 to 7 are diagrams for explaining the operation of the embodiment device, and FIG. 8 is a diagram for explaining the deformation of the pipe. 10...pipe, 20...fixed base, 22...movable base,
24...Parallel link, 26...First roller, 32...
Second roller, 34...Third roller, 38...Lever.

Claims (1)

[Scope of Claims] 1. A movable base is connected to the fixed base via a parallel link, and a first pressing tool for bending a pipe along the outer periphery is attached to the movable base side on the work surface of the fixed base, A second pressing tool for bending the pipe along the outer periphery is similarly attached to the fixed table side of the movable table, facing the first pressing tool, and on the work surfaces of both tables, there is a A pipe bending device comprising: a locking device for holding the non-bending portion of the pipe parallel to each other; and a means for moving the movable table. 2. The pipe bending device according to claim 1, wherein the first and second pressing tools are rotatable rollers. 3. The moving means is a lever having one end pivoted to a fixed base as a fulcrum and a middle part connected to a movable base as a point of action. Pipe bending equipment as described.