US3730504A - Workpiece scarfing device - Google Patents

Abstract

A device made up of a set of blocks. Each block comprises a gascutting unit with an upper portion against which butts a gasdistributing unit, incorporating an oxygen and combustible gas chambers fitted with cut-off diaphragm valves. Mounted on a cover of the gas-distributing unit is a gasregulating unit intended for actuating each valve individually.

Description

United States Patent 1 Daiker et a].

May 1, 1973 WORKPIECE SCARFING DEVICE Inventors: Artur Lvovich Daiker, ulitsa B. Kh-

melnitskogo, 27, kv. l4; Alexandr Nikolaevich Morozov, prospekt Lenina, 74, kv. 25; Anatoly Ivanovich Veis, ulitsa Vorovskogo 9, kv. 77; Boris Grigorievich Kushtuev, ulitsa Degtyareva, 37, kv. 8; Nikolai Mikhailovich Novoselov, ulitsa Degtyareva, 89, kv. 58; Viktor Nikolaevich Zhuravlev, ulitsa Kalinina, 19, kv. 107; Alexei Fedorovich Zinoviev, ulitsa B. Khemlnitskogo, 9, kv. 85, all of Chelyabinsk; Ivan Ivanovich Alfeev, ulitsa Kalinina, 3, kv. 66, Magnitogorsk; Viktor Ivanovich Nikitin, ulitsa P. Kalmykova, l6, kv. 58, Chelyabinsk; Alexei llich Kochergin, Teatralny pereulok, 4, kv. 24, Chelyabinsk; Vladimir Filippovich Matashkov, ulitsa Ya. Gasheka, 18, kv. l3, Chelyabinsk; Nikolai lvanovich Karelin, ulitsa Lipetskaya, 23, kv. l6, Chelyabinsk; Jury Venediktovich Volchematiev, ulitsa l Sputnika, 27, kv. 55, Chelyabinsk; Veniamin Fedorovich Zaluzhentsev, ulitsa Degtyareva, 37, kv. 6, Chelyabinsk; Gennady Yakovlevich Morozov, I ulitsa Kommunisticheskaya, 6a, kv. 67, Chelyabinsk, all of U.S.S.R.

Primary Examiner-Gerald A. Dost Attorney-Holman & Stern [5 7] ABSTRACT A device made up ofa set of blocks. Each block comprises a gas-cutting unit with an upper portion against which butts a gas-distributing unit, incorporating an oxygen and combustible gas chambers fitted with cutoff diaphragm valves.

Mounted on a cover of the gas-distributing unit is a gas-regulating unit intended for actuating each valve individually.

3 Claims, 6 Drawing Figures PATENTEDHAY 1 I875 SHEET 3 OF 3 D D D KJCDEJEJ D DE C The present invention relates to metallurgy and more particularly to devices for scarfing workpieces.

Widely known is a workpiece scarfing device incorporating: a gas-distributing unit comprising several chambers through which working gases are supplied and a number of conduits which serve to connect the chambers with appropriate cavities of gas-cutting units (scarfing torches), secured to a lower part of the gasdistributing unit. Surface removal width is controlled by a gas-regulating unit fastened on a plane surface of the gas-distributing unit and made up of pistons enclosed in the chambers of the said gas-distributing unit, with the pistons manipulated by screw or rack and pinion devices driven by electric or pneumatic power. Also known is a device for stepless regulation of the width of the surface removal, which is executed by shutting off the conduits running to the gas-cutting unit with the aid of a flexible gastight band.

Conventional devices, comprising a scarfing head with gas-distributing units, do not provide for rapid readjustment of the devices in changing sizes of the workpieces, which along with heavy weight and large overall dimensions tend to increase the sizes of scarfing facilities, complicate the arrangement of. equipment and hoses and hamper their maintenance. The conventional devices are not standardized; they are produced of an integral blank up to 2 m long in which is drilled a multiplicity of conduits having a small diameter and running all along its length. In the known scarfing devices remote position indicators of a piston group of the gas-distributing units are unreliable under the combined action of high temperatures, humidity and aggressive gaseous medium, while frequent displacement of the pistons within the distributing chambers without lubrication results in piston packing wear. The orthodox devices are not applicable to machines for selective metal scarfing.

It is an object of the present invention to develop a workpiece scarfing device which would ensure high production rates by reducing time requirements for readjustment in case of a change in dimensions of the workpiece being scarfed.

According to the specified and other objects in a workpiece scarfing device, comprising a gas-distributing unit with a lower part against which butts a gascutting unit fitted with an oxygen jet and those for supplying combustible gas and supplementary oxygen, with-the latter formed by corrugations of zigzag walls positioned on both sides of the oxygen jet, and a gas regulating unit, conforming to this invention the said gas-distributing, -cutting and -regulating units are interlocked in a single block with at least two such blocks being incorporated in each device and with the gas-distributing unit of each block having an oxygen and a combustible gas chamber located under a common cover and accommodating a similar number of cut-off diaphragm valves, communicating via passages with appropriate torches or jets of the gas-cutting unit, and with the gas-regulating unit of each block mounted on the cover of the said gas-distributing unit and arranged to actuate each valve individually.

According to this invention the gas-regulating unit is sectinalized with each section subdivided by a membrane into a lower and an upper chamber with the lower chamber enclosing a jet with a spring-biased baffle interacting with the said membrane and communicating via passages with two corresponding cut-off diaphragm valves of the gas-distributing unit: with the valve positioned in the oxygen chamber and with that located in the combustible gas chamber; the gas-regulating unit is also fitted with a baffle unblocking bellow and its upper chamber has pressure transducerd in communication with each other and set up on lateral faces of two adjacent blocks, and is furnished with two bellows, one of which encloses the other one and which are designed for interlocking and holding the baffle of the lower chamber through the said membrane.

With the above conceptual design a higher production rate can be provided by reducing device readjustment time in case ofa change in workpiece dimensions; it enables also the scarfing front to be controlled automatically and makes it possible to carry out the selective scarfing of workpieces by the application of an automatic cycle. In compliance with the present invention a modified version on the gas-regulating unit of the proposed device is also possible, i.e.: with the gas-regulating unit of each block furnished with an air cylinder coupled by a multichannel hose with respective cut-off diaphragm valves of the gas-regulating unit, with a piston of the said air cylinder being articulated with former bars set up on a roll table and intended to direct the workpiece to a scarfing position, which will permit the surface removal width to be modified under automatic and remote control. 1

The invention will be better understood from a description of an exemplary embodiment of this invention to be considered with reference to the appended drawings, in which:

FIG. I is a layout of a device, conforming to the invention, showing the arrangement of various units;

FIG. 2 same, a longitudinal sectional view;

, FIG. 3 shows a layout of the device, conforming to the invention, with a modified version of the gas-regulating unit;

FIG. 4 same, a longitudinal sectional view;

FIG. 5 depicts jets, a view along arrow A of FIG.2;

FIG. 6 shows an automatic control circuit of the device conforming to this invention.

A workpiece scarfing device comprises a gas-cutting I (FIG. I), a gas-distributing 2 and a gas-regulating unit 3, all interlocked to form a single block 4. The device can be made up of several such blocks 4.

Gas-distributing unit 2 of block 4 is enclosed in a housing and comprises oxygen chamber 5 (F IG.2) and combustible gas chamber 6 into which both the oxygen and gas are fed from below through arm 7.

Both chambers 5 and 6 are enclosed on the top with cover 8. Chambers 5 and 6 communicate through drillings 9 and I0 with gas-cutting unit I, butting against a lower part of gas-distributing unit 2. Drillings 9 and 10 are closed by cut-off diaphragm valves 1 1 located in equal number in chambers 5 and 6.

Valves II comprise jet I2 and diaphragm I3 secured between the housing of gas-regulating unit 2 and cover 8.

The gas-regulating unit is mounted on cover 8 and incorporates a sectionalized housing with each section comprising lower I4 and upper IS plates with chambers I6 and I, separated by membrane I5 Lower chamber l7 accommodates jet l9 with baffle 20 fitted with back-moving spring 21 and bellow 22 for unblocking baffle 20. Upper chamber I6 contains two bellows, one enclosed into another, of which internal bellow 23 is intended for holding baffle 20 in a lower position, whereas external bellow 24 is designed for interlocking same baffle 20.

Jet I9 of lower chamber I7 in each section of gasregulating unit 3 is connected via passages with two cut-off diaphragm valves II of gas-distributing unit 2, one of which is enclosed in chamber 5 and another in chamber 6.

Mounted on lateral faces of gas-regulating units 3 of the adjacent blocks are four pneumatic transducers 25 which send a signal into upper chamber I6 via hole 26.

Another modified version of gas-regulating unit 3 of either block is also feasible.

Thus gas-regulating unit 3 can incorporate air power cylinder 27 (FlG.3) set up on a roll table and accommodating piston 28 allowed to travel and hinged to former bars 29 mounted also on the roll table and designed to direct a workpiece for scarfing. One cavity of air cylinder 27 is in communication with atmosphere, while the other one is pressurized. Both cavities of air cylinder 27 are coupled with the aid of air multichannel hose 30 to appropriate cut-off diaphragm valves II of gas-distributing unit 2. In order to enhance reliability of gas-regulating unit 3 it would be expedient to provide manual control of the surface removal width through the use of switch 31, air cylinder 32 and piston 33, positioned on a scarfer control board.

Gas-cutting unit I of each block comprises upper plate 34 (FIGS 2, 4 and 5) and lower plate 35, oxygen jet 36 for feeding primary oxygen, two corrugated zigzag partitions 37 and 38, disposed between oxygen jet 36 and plates 34 and 35, and screws (not shown in the drawing) fastening the aforesaid members into a single block. Upper plate 34 incorporates equalizing chambers 39 separated by the partitions and in communication via drilling I with oxygen chamber of gas-distributing unit 2.

The scarfing device functions as follows.

As soon as the device blocks are set up on the metal to be scarfed, pneumatic transducer 25, depending on the dimensions of the billet, being scarfed, is placed opposite one of the sections of upper chamber I6 of gasregulating unit 3 (for example, II, FIG.6); next air is fed with the ensuring rise in pressure in chamber 16 of the section.

Membrane I8 (FIGS 2 and 6) acting on baffle pushes it downward cutting off jet I9. The air being constantly supplied along drilling 9 and throttle 4l into an interior ofjet I9, the pressure progressively builds up and acts on holding bellow 23 of baffle 20, ensuring thereby the shutting off of jet l9 throughout the interval, until an adequate pressure is built-up in the bellow cavity to unblock the baffle. Simultaneously with the pressure fed into bellow 23, a control pressure is supplied to cut-off diaphragm valves II in chambers 5 and 6 ing of the adjacent sections (III and so on), located beyond the limits of the scarfing zone, a signal is sent into the interior of bellows 24 of section III. Then baffle 20 will shut-off jet I9 actuating two coupled to it cut-off diaphragm valves II of gas-distributing unit 2. The remaining sections are detached in a similar manner.

As the device, proposed herewith, is adjusted for a given size of the workpiece, to be scarfed, it remains fixed until valve 42 provides an adequate pressure in the cavity of bellows 22 to unblock the baffles.

Readjustment for a new size of the workpiece, to be scarfed, is effected in a similar way.

With the modified version of gas-regulating unit 3, when the width of the surface removal is controlled remotely, former bars 29, set up on the roll table, are brought together, until they touch lateral faces of the workpiece to be scarfed. Coupled to former bars 29 (FIG.3) piston 28 is also displaced at that, travelling in air control cylinder 27 and changing thereby a volume of control air contained within the cylinder, with the air fed in the form of signals via multichannel air hose to cut-off diaphragm valves ll of gas-distributing unit 2 whose (valve) operation has been described hereinbeof gas-distributing unit 2, which results in the covering 7 of valves II. On feeding the control pressure, diaphragm l3 deflects, discontinuing the supply of a working gas to gas-cutting unit I. When the control pressure is relieved, diaphragm 13 goes up under the influence of the working gas and valve II will open. To ensure the closfore.

Manual and automatic control of the width of the surface removal by scarfing are similar operations with the only difference that in the first case piston 33 is displaced in air cylinder 32 by hand by an operator. Remote or manual mode of operation of the device is selected by manipulating switch 31.

Control of the surface removal width effected by gasregulating unit 3 allows actuating the requisite number of cut-off diaphragm valves II of gas-distributing unit 3. In scarfing the oxygen contained in gas-distributing unit 2I passes through a clearance between diaphragm I3 and jet I2 from chamber 5 via drillings I0 into equalizing chamber 39 in upper plate 34 (FIGS 2 and 5) and then through a lattice wall into an interior of oxygen jet 36, assuring uniform distribution of the oxygen throughout the width of the surface being scarfed. A certain amount of the oxygen is diverted to zigzag partitions 37 and 38 to produce, upon mixing with a combustible gas, a heating flame. From chamber 6 the combustible gas flows via corresponding drillings 9 to the corrugations of zigzag partitions 37 and 38 on either side of an oxygen flow.

The use of zigzag partitions 37 and 38 permits producing alternating gas and supplementary oxygen flows, increasing their contact surfaces, ensuring better mixing and obtaining a stable, high-rate and high-temperature heating flame on both sides of the oxygen stream. That is why oxygen purity in a cuttingjet varies insignificantly with the jet length.

The hereindescribed device, being versatile, is suited not only for continuous but for selective scarfing as well.

What is claimed is:

l. A workpiece scarfing device incorporating: a gascutting unit fitted with an oxygen jet and jets for supplying combustible. gas and supplementary oxygen, said latter jets being formed by corrugations of zigzag walls and positioned on both sides of the oxygen jet; a gasdistributing unit butting against an upper part of the said gas-cutting unit and comprising an oxygen chamber and a combustible gas chambers, both located under a common cover; cut-off diaphragm valves set up in equal number in the said oxygen and combustible gas chambers of said gas-distributing unit and in communication via passages with appropriate jets of the said gascutting unit; a gas-regulating unit mounted on the said cover of the said gas-distributing unit and designed for actuating individually each cut-off diaphragm valve of the said gas-distributing unit; the said gas-cutting, gasdistributing and gas-regulating units being interlocked to form a single block with at least two such blocks incorporated in the device.

2. A device of claim 1, in which the said gas-regulating unit is sectionalized with each section divided with a membrane into a lower and upper chambers with the lower chamber accommodating a jet with a springbiased baffle interacting with the said membrane, said jet being in communication via passages with two corresponding cut-off diaphragm valves of the said gas-distributing unit: one valve enclosed in the said oxygen chamber and the other valve enclosed in the said combustible gas chamber; the said upper chamber being fitted with pressure transducers communicating with each other and mounted on lateral faces of the said adjacent blocks; the upper chamber housing also two bellows one of which encloses the other and which are intended for interlocking and holding the said baffle of the lower chamber through the said membrane 3. A device of claim 1, in which the said gas-regulating unit has an air cylinder coupled by a multichannel air hose with appropriate cut-off diaphragm valves of the said gas-distributing unit; a piston of the said air cylinder articulated with former bars set up on a roll table and designed to direct a workpiece for scarfing.

Claims (3)

1. A workpiece scarfing device incorporating: a gas-cutting unit fitted with an oxygen jet and jets for supplying combustible gas and supplementary oxygen, said latter jets being formed by corrugations of zigzag walls and positioned on both sides of the oxygen jet; a gas-distributing unit butting against an upper part of the said gas-cutting unit and comprising an oxygen chamber and a combustible gas chambers, both located under a common cover; cut-off diaphragm valves set up in equal number in the said oxygen and combustible gas chambers of said gas-distributing unit and in communication via passages with appropriate jets of the said gas-cutting unit; a gas-regulating unit mounted on the said cover of the said gas-distributing unit and designed for actuating individually each cut-off diaphragm valve of the said gas-distributing unit; the said gas-cutting, gas-distributing and gas-regulating units being interlocked to form a single block with at least two sucH blocks incorporated in the device.

2. A device of claim 1, in which the said gas-regulating unit is sectionalized with each section divided with a membrane into a lower and upper chambers with the lower chamber accommodating a jet with a spring-biased baffle interacting with the said membrane, said jet being in communication via passages with two corresponding cut-off diaphragm valves of the said gas-distributing unit: one valve enclosed in the said oxygen chamber and the other valve enclosed in the said combustible gas chamber; the said upper chamber being fitted with pressure transducers communicating with each other and mounted on lateral faces of the said adjacent blocks; the upper chamber housing also two bellows one of which encloses the other and which are intended for interlocking and holding the said baffle of the lower chamber through the said membrane.

3. A device of claim 1, in which the said gas-regulating unit has an air cylinder coupled by a multichannel air hose with appropriate cut-off diaphragm valves of the said gas-distributing unit; a piston of the said air cylinder articulated with former bars set up on a roll table and designed to direct a workpiece for scarfing.

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