JP3191095B2 - Flange return machine for cylindrical duct - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange turning machine for a cylindrical duct.

[0002]

2. Description of the Related Art As shown in FIG. 1, a cylindrical duct (spiral duct or the like) is fitted with a ring-shaped flange on the outer surface at both ends for connection, and the flange is prevented from being pulled out by turning the flange at the end of the cylindrical duct. Conventionally, this flange turn-back has been formed by hand using a hammer for hitting at a factory or a site, or by using a machine and a hand-operated hammer in combination.

[0003]

However, there is a problem in that flange turning by hammering requires a skill and still causes unevenness. In the case of a large cylindrical duct, two or three skilled workers are required. Therefore, there is a problem in that labor saving is prevented and intense noise is generated. Also, when the cylindrical duct is made of a material such as a thick plate or stainless steel, there is a problem that the flange cannot be turned back by hitting.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a cylindrical duct is prevented from retreating by inserting an upper or lower part of an edge of a cylindrical duct between forming rolls with an inclination in any of upper, lower, left and right directions. While the convective rotation of the forming roll and the reversal of the upper or lower side in the right-angle direction cause the end edge of the duct to be turned over, the problem is solved.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

A frame 3 having a predetermined height is provided on one half of a base plate 2 having a caster 1 on a lower surface, and side columns 3a and 3b having a height of one step are provided inside the frame 3 so that the side columns 3a , 3b, a mounting plate 5 having a pivot point 4 is mounted. The mounting plate 5 extends to the frame base 3 side and horizontally mounts a molding machine main body 6 on a central portion of a bottom plate 5a. The molding machine main body 6 includes a pair of upper and lower molding rolls 6a and 6b in a horizontal direction at a front end. A motor 6c for convective rotation of the forming rolls 6a, 6b is mounted at the rear end. The center between the front ends of the molding rolls 6a and 6b is made to coincide with the position of the rotation fulcrum 4.

[0007] Reference numeral 7 denotes a ruler plate which is inserted into the molding rolls 6a, 6b. I have to.

Reference numeral 8 denotes a rod 8a which is extended and retracted by a hydraulic cylinder vertically mounted on the insole plate 3c of the frame 3 and pivotally mounted 9 below the middle of the molding machine body 6 to extend the rod 8a. When activated, as shown in FIG.
When the respective parts a and 6b are inverted in the vertical direction above the horizontal state and contracted, the original horizontal state is returned as shown in FIG.

On the base plate 2 opposed to the molding machine main body 6, roll receiving stands 11a and 11b each having a V-shape in side view, which can be raised and lowered with a lift 10 interposed therebetween, are provided with a slight rightward inclination. The roll receiving stands 11a and 11b are formed by arranging a large number of rolling rolls 11c in a V-shape, and are arranged side by side at two intervals. 10a
Is an elevating guide.

The cylindrical duct S is placed on the roll receivers 11a and 11b, and is raised and lowered by the operation of the elevator 10 to form the upper end of the edge facing the molding machine body 6 as shown in FIG. Between the forming rolls 6a, 6b until it hits the ruler plate 7, and the insertion portion of the cylindrical duct S is inclined between the forming rolls 6a, 6b by adjusting the approach of the forming roll 6b by the contact / separation adjusting cylinder 6d. Then, the molding machine body 6 is operated to form the molding rolls 6a, 6b.
Is convectively rotated, and simultaneously, the cylinder 8 is operated to operate the rod 8a.
As a result, the molding rolls 6a and 6b together with the molding machine main body 6 are gradually inverted upward.

The cylindrical duct S is driven and rotated by the rotation of the molding rolls 6a and 6b, and the edges are gradually bent upward by the reversal of the molding rolls 6a and 6b, so that a substantially right angle set angle is obtained as shown in FIG. 12
Is formed. Incidentally, the reaction force generated in the process of the flange turning back 12 may cause the cylindrical duct S to retreat and the edge to be pulled out from between the forming rolls 6a and 6b. In this case, only a very small force acts in the retreating direction (inclination direction) due to the oblique insertion, and the retreat occurs due to the weight of the cylindrical duct S and the friction between the cylindrical duct S and the roll receiving stands 11a and 11b. Therefore, there is no possibility that the edge is pulled out from between the forming rolls 6a and 6b in the process of the flange turnback 12 at all. The purpose can be achieved by attaching the roll receiving stand, that is, the cylindrical duct S, to the above-described right-side inclination, or to any direction combining left, up, down, up, down, left, and right. Reference numeral 13 denotes a flip-up preventing roll which moves up and down or turns by operating the switch 13a so as to suppress the upper end of the intermediate portion of the cylindrical duct S.

After the formation of the flange turn-back 12, a forming roll
The gap between 6a and 6b is slightly opened to release the pinch of the flange barb 12, and the cylinder 8 is pulled out of the flange barb 12 by the contraction operation to return to a horizontal state and stopped at a low position by the operation of a limit switch (not shown). And prepare for the next flange turn.

FIGS. 6 and 7 show a lower portion of the end of the cylindrical duct S between the forming rolls 6a and 6b.
This shows an example in which the flange is turned upside down by inverting 6a and 6b, and the mounting plate 5 for inverting the molding machine main body 6 is operated by a rotary cylinder 14 provided outside one of the side columns 3b. Others are the same as the previous example. The forming rolls 6a and 6b may be reversed in any perpendicular direction including left and right in addition to the above vertical direction.

FIG. 8 shows another embodiment, particularly an example suitable for turning back a heavy-weight large-diameter cylindrical duct S by means of a flange. A pivotable post-type jib crane 15 is provided on a frame 3 and a jib crane 15 is provided. The cylindrical duct S is lifted by the chain hoist 16 which is suspended so that it can move and run freely.
This makes it easy to turn and carry out. Reference numeral 17 denotes a suspension belt, and reference numeral 18 denotes an operation switch of the chain hoist 16. In addition, the example of FIG.
The rack 19a and the pinion 19b mesh with each other so that the handle 19c can be moved and adjusted in the front-rear direction by rotating the handle 19c.
Roll supporting table 10 is rotated by rotating tilt control handle 21 with a screw shaft, which can be horizontally tilted and movable around a fulcrum 20 provided under forming rolls 6a and 6b. The angle of horizontal inclination of 11a and 11b can be adjusted freely. Thus, these mechanisms can also be installed in the above-mentioned flange turning machine shown in FIGS.

[0015]

As described above, the present invention sandwiches the upper or lower edge of a cylindrical duct which is laid on an elevator by two convective rotating upper and lower forming rolls. By rotating the forming roll gradually in the vertical direction of the upper or lower side while rotating for transmission, a flange return is formed around the entire edge of the cylindrical duct, so the flange return of cylindrical ducts of various sizes, large and small Can be formed efficiently.

There is an effect that a flange turn can be easily formed on an end edge of a cylindrical duct formed of a thick plate, stainless steel, or the like.

The retraction of the cylindrical duct that occurs when the flange is turned over can be prevented only by inserting the cylindrical duct with an inclination in any of the upper, lower, left, and right directions with respect to the forming roll. There is an effect that the flange can be reliably turned back without requiring a complicated mechanism or complicated work.

By contacting the width of the end of the cylindrical duct between the forming rolls with a ruler plate which can freely move in and out, the effect of adjusting the flange return width to be large or small is produced.

Since the flange turn is formed by roll molding, there is an effect that labor saving can be promoted without requiring skill and a large number of people, and an effect that a quiet working environment without noise can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cylindrical duct (spiral duct) in which a flat flange is brought close to a flange turn.

FIG. 2 is a sectional view showing a connection state of two cylindrical ducts.

FIG. 3 is a plan view showing an upside down type flange turning machine.

FIG. 4 is a front view of the same.

FIG. 5 is a front view when the flange is turned back.

FIG. 6 is a plan view showing a reversing type flange turning machine.

FIG. 7 is a front view when the flange is turned back.

FIG. 8 is a front view showing another example.

[Explanation of symbols]

 1 is a caster 2 is a base plate 3 is a frame base 3a, 3b is a side pillar 3c is an insole plate 4 is a rotation fulcrum 5 is a mounting plate 5a is a bottom plate 6 is a molding machine body 6a, 6b is a molding roll 6c and a motor 6d is 7 is a ruler plate 7a, 7a is a mounting shaft 7b, 7b is a screw 8 is a cylinder 8a is a rod 9 is a pivot 10 is an elevating platform 10a is an elevating guide 11a, 11b is a roll receiving platform 11c Rolling roll 12 Flanged 13 Rolling prevention roll 13a Rolling prevention roll operation switch 14 Rotary cylinder 15 Post type jib crane 16 Chain hoist 17 Hanging belt 18 Operation switch 19a Rack 19b Pinion 19c is a handle 20 is a fulcrum 21 is a tilt angle adjustment handle 22 is a hydraulic unit 23 is an electric control panel 24 is a balancer weight that assists inverting the molding machine upward 25 is a foot switch

Claims (2)

(57) [Claims] 1. A molding machine main body having a pair of two molding rolls, which is inverted in a right angle direction gradually upward or downward from a horizontal direction while rotating by convection, is formed. The upper and lower ends of the cylindrical duct which is rotatably placed on the roll receiving table so as to be rotatable on the roll receiving table are formed by tilting the upper and lower sides of the roll receiving table. The flange is turned around by convective rotation of the forming roll and reversal of the cylindrical roll upward or downward at right angles while preventing the cylindrical duct from being retracted by being inclinedly inserted between the rolls. Return machine for cylindrical ducts. 2. The flange turning machine according to claim 1, wherein a ruler plate for regulating the flange turning width of the cylindrical duct is freely inserted in and out of the forming roll.