JPH0670970U - Plasma cutting device for spiral duct forming machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention cuts a molded duct that is automatically sized in the formation of a spiral duct with a plasma torch of a plasma cutting device, and cuts the cut surface in comparison with a conventional saw tooth or a roll cutter. In addition, the smooth and fine finish is achieved, the cutting chips are removed from the duct and the dust collection process is rationalized, and the processing noise is reduced to reduce the labor of spiral duct molding. [Structure] A plasma cutting device 9 is connected to a spiral duct forming machine 10, a sizing positioning device for cutting the forming spiral duct 7, a moving device of a plasma torch 8 and a plasma generating device, a duct rotary feed and chip attachment by compressed air. It consists of the removal and dust collecting device 11 and an automatic control device for synchronously operating the plasma cutting cycle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to automatic cutting of a spiral duct molding machine equipped with a plasma cutting device 9 at a position after completion of the goose tightening process of the spiral duct molding machine 10 for air conditioning.

[0002]

[Prior art]

 The cutting of the spiral duct is mainly due to saw blades and roll cutters, and there are manual, automatic, and semi-automatic methods, but the cut part of the duct becomes rough like a burr, and sharp burr removal especially in the goby part is removed. It is unavoidable to remove the chips from the duct. In addition, uneven mechanical cutting resistance causes an increase in processing noise and growling.

[0003]

[Problems to be solved by the device]

 High-speed automatic sizing of the duct during spiral duct molding, improvement of finishing accuracy of the duct cut surface, rationalization of duct chip removal and dust collection, quieting of processing noise, labor saving of molding duct work Try to change.

[0004]

[Means for Solving the Problems]

 The spiral torch forming machine 10 is provided with a plasma torch 8 provided at the tip of the plasma cutting device 9 near the end of the goby tightening process step, and the forming spiral duct 7 is rotated by rotating the forming torch 8. While the plasma torch 8 is moved in the duct axis direction X in accordance with the advance of the forming spiral duct 7, the forming spiral duct 7 is cut in the direction orthogonal to the duct axis X by the discharge arc generated by the plasma torch 8. For this purpose, it is equipped with a sizing positioning device, plasma generator, cutting chips removal by compressed air and dust collecting device 11, and an automatic control device that controls repeated operation cycles.

[0005]

The plasma torch 8 of the plasma cutting device 9 generates a discharge arc in a downward direction of the outer periphery of the duct from a position close to the lower inner periphery of the forming spiral duct 7. The plasma torch 8 moves so as to cut the shaped spiral duct 7 in a direction perpendicular to the duct axial direction X, in accordance with the progress of rotation of the duct. When the plasma torch 8 is discharged, compressed air is ejected from the torch shaft so as to remove the chips of the duct material at the cutting portion. The chips are stored in the waste box 13 of the dust collector 11 provided below the cutting section.

[0006]

【Example】

 The plasma cutting device 9 has already been implemented in the Fukagawa spiral duct forming machine 10, and will be described below with reference to the accompanying drawings. The forming spiral duct 7 is formed into a tubular shape by the spiral duct forming machine 10, and when the tip of the forming spiral duct 7 reaches a fixed size position, the spiral duct forming machine 10 temporarily stops its operation.

When the plasma torch 8 of the plasma cutting device 9 moves to the inside cutting start position of the forming spiral duct 7, the spiral duct forming machine 10 restarts operation, and the forming spiral duct 7 rotates in the duct axial direction X. As the plasma torch 8 moves in the duct axial direction X as the forming spiral duct 7 advances, a discharge arc is generated downward in the inner circumference of the forming spiral duct 7 to move the forming spiral duct 7 to the duct axis. Cut in the direction perpendicular to the direction X. During that time, compressed air is blown out from the plasma torch shaft, and the chips are discharged and removed below the duct cutting part.

In the processing cycle of the plasma cutting device 9, an electric signal from the limit switch 12 provided in the device is processed by the control device to be automatically operated. The forming and cutting of this spiral duct can be repeated up to the quantity indicated by this control device.

The chips discharged at the time of cutting the duct are collected in a box-shaped dust collecting device 11, and the chips are stored in a lower scrap box 13.

[0010]

[Effect of device]

 Compared with the rough finish of conventional saw blades and roll cutters, it is inevitable to attach chips at the cutting part of the spiral duct and to remove dangerous sharp burrs, especially at the goby part. Since the cut surface of the duct formed by No. 8 becomes welded due to the high heat of the discharge arc locally generated in the minimum portion, an extremely fine smooth surface finish is obtained, and removal or cleaning of burrs at the cut portion is not necessary. In addition, by blowing compressed air, chips can be discharged by duct cutting and the dust collection can be rationalized, and an extremely large labor saving can be achieved with the use of an automatic control device. In addition, the operation noise caused by cutting the duct can be made extremely quiet.

[Brief description of drawings]

FIG. 1 is a plan view in which a plasma cutting machine is attached to a spiral duct forming machine.

FIG. 2 is a front view.

FIG. 3 is a left side view.

[Explanation of symbols]

 1 Ducting Material 2 Entrance Ruler 3 Forming Roll 4 Ring 5 Top Crushing Roll 6 Bottom Crushing Roll 7 Forming Spiral Duct 8 Plasma Torch 9 Plasma Cutting Device 10 Duct Forming Machine 11 Dust Collector 12 Limit Switch 13 Waste Box 14 Dust Avoiding Plate X duct axial direction

Claims (1)

[Scope of utility model registration request] 1. A duct processing material 1 for an air-conditioning spiral duct is passed through an inlet ruler 2 of a spiral duct molding machine 10, and a goby portion connecting the ducts is processed by a forming roll 3.
In a spiral duct molding machine in which the processed material is made into a spiral shape (rolled plate shape) with the ring 4, the goby portion is crushed, and the rolls 5 and 6 are tightened with a gore, and the spiral duct formed into a tubular shape is extruded in the axial direction X of the duct. In order to position and cut the shaped spiral duct 7 at a fixed size at the end portion of the goose tightening process, a plasma cutting device 9 provided with a plasma torch 8 at its tip is provided with the spiral duct forming machine 1.
0, and the molding spiral duct 7 is rotated to cut, and a discharge arc is generated downward from the molding spiral duct 7 from a position close to the lower inner circumference of the molding spiral duct 7 to generate a discharge arc. Equipped with a plasma torch 8 for automatically cutting the pipe in a direction perpendicular to the duct axis X, and a dust collecting device 11 for collecting chips of duct material discharged below the duct by compressed air. It is a duct molding machine.