KR20170043790A

KR20170043790A - Spacer for plasma cutter torch

Info

Publication number: KR20170043790A
Application number: KR1020150143297A
Authority: KR
Inventors: 지 성 황
Original assignee: 주식회사 프라즈마태우
Priority date: 2015-10-14
Filing date: 2015-10-14
Publication date: 2017-04-24
Also published as: KR101758250B1

Abstract

The present invention relates to a spacer for a torch of a plasma cutter. The present invention comprises: a fixing band rolled and attached to a main groove of an insulator head of a plasma torch through bending elasticity; a control band attached to the fixing band through bending elasticity, and including support legs in left and right sides; and a separation distance control device installed between the fixing band and the control band to support the control band on the fixing band while at the same time controlling a separation distance of the plasma torch. The separation distance control device comprises: a fixing protrusion installed in left and right sides of the fixing band to be combined with a connection passage of the control band; and a connection passage installed in left and right sides of the control band to insert the fixing protrusion into a plurality of combination grooves. According to the present invention, the spacer for a torch of a plasma cutter is capable of controlling a separation distance at multiple stages by assembling the fixing and control bands with the control device; controlling the separation distance by moving the fixing protrusion of the fixing band in the combination grooves by installing the combination grooves in the connection passage of the control band; easily changing an old control band by installing an entrance in the connection passage; unfolding the bands when pushing a protruding piece of a handle and attaching the bands to the plasma head through bending elasticity when releasing the pushing force by installing the handle on the fixing band; making smooth a moving cutting function of the torch by using a small width, which is the thickness of the support legs of the plasma spacer, as a sliding width of a material to be cut; and preventing the attachment of melted metal substances by covering the support legs with a heat-resisting plastic sheath.

Description

Spacer for plasma cutter torch [0002]

The present invention relates to a spacer for a plasma cutter soil trench.

The plasma cutter sputtering spacer is a mechanism for keeping the length of the high density plasma arc gas body (hereinafter referred to as "separation distance" or "flame length") constant between the material to be cut and the tip of the soil nozzle.

More specifically, it is a mechanism for keeping the cutting distance constant between the plasma arc discharged from the power set by the cutting operator (see Table 1) and the workpiece to be cut.

Understanding Plasma Cutting

1. Plasma (Plasma)

Plasma refers to the material in the ionized (e ^- ) state as the substance following the third phase of the substance (solid, liquid, gas). Plasma is classified into several types depending on the ionization state (solid, liquid, gas, high-level, low-level, etc.). The chemical structure of plasma is A atom ↔ A ⁺ + e ^-

In an ionization state with high energy, the plasma is reduced to a stable state when the ionization condition is lost, and the energy of the higher level is released into the reduction energy.

2. Plasma cutting ((PLASMA CUTTING)

Plasma cutting is performed by setting a direct current (DC) electric potential difference with a plasma power source and cutting the electric potential difference energy (25V: welding, 85V: gouging, 115V or more: cut).

The DC current voltage (DC) is ejected as an ion (e ^- ) gas in the plasma cutting and is contacted with the material to be cut, thereby dissociating the material bonds of the material to be cut.

The feature of this plasma cutting is that even if there is no preheating, cutting is made immediately after arc transition.

A plasma torch is a tool that concentrates ion gas in plasma cutting.

Such plasma cutting is technically distinguished from the oxidative cutting, the cutting which induces the cutting with force, the tool, and the heat of dissolution, and is also called the fourth cutting method.

In addition, plasma torch is a transition type in which the material to be cut is different depending on whether it is an electric conductor or an electric nonconductor, and a transition type in which the electric conductor is cut by the arc cutting method according to the cutting operation, a non-transition type There is Tōchi. In the jet cutting method, it is used in an automation device due to a safety problem.

3. Plasma Cutting

Automatic cutting uses CNCs, semi-automatic devices and other devices as a means of transporting plasma soil along the cutting line. In this case, it is possible to cut by keeping the separation distance constant. In this case, few spacers are used.

In the case of manual plasma cutting, a worker normally holds the soil by hand and moves the soil. In this case, the spacer is highly dependent, the consumed amount of the consumable is increased, the cutting quality is deteriorated, and the safety of the operator is weak.

The tongue spacer is an important device for solving all the problems in the above manual cutting.

4. Relationship between cutting current setting and separation distance

The setting of the cutting current and the separation distance are variable and generally proportional, and are important to determine the cutting quality.

The cutting current of the plasma cutter uses a variable current supply. The operator selects the current capacity suitable for the thickness of the cut material and the cutting movement speed on site. The preferred separation distance of the nozzle tip relative to the cutting current capacity is as follows.

The separation distance of the nozzle tip is the distance between the material to be cut and the nozzle tip or the length of the cutting flame exposed on the material to be cut.

Standard separation distance table for output current Output current (A) Less than 50 50 to 90 90-120 120 150 or more
Flame length
(mm)
1-3
4 to 6
7 to 8
9-10
11 ~

5. Consumables and Cutting Power of Plasma Cutting

Nozzle tip, electrode, cap

A consumable as an essential component of the plasma cutting torch is an electrode that emits a negative electron (e ^- ) and accepts a positive current (A ⁺ ), a nozzle tip that creates and centers the electron beam, and an electrode and nozzle And a cap to protect the nozzle. The diameter of the electron beam discharged from the nozzle tip is determined by the gas discharge diameter (∮) of the nozzle tip. The diameter of the nozzle tip is larger when the cutting current (A) is large. The nozzle tip is a part that immediately breaks when it touches the cutting material when the current capacity is large.

A commercially available contact nozzle tip is cited in Fig.

The nozzle tip of Figure 8 is used in a low capacity cutter with a cut current of 40 A or less. The tip of the nozzle tip is a '+' shaped nozzle and is in contact with the material to be cut. This nozzle maintains the length of the nozzle flame within 1.0 mm, but it can not be used for general cutting currents of 60A ~ 120A because of the additional processing cost of the nozzle.

Wire type spacer

As described above, the plasma cutting force varies greatly depending on the structure of the plasma ground. The important factors for improving the cutting force are the machining state of the nozzle, the finishing treatment, and the maintenance of the separation distance suitable for the set current. Since the most fluctuating elements among the elements for improving the cutting force are the spacing distance, it is very important to improve the performance and the role of the spacer which keeps the spacing distance constant when using the plasma cutting machine.

In plasma arc transfer manual cutting, a spacer is required to protect the nozzle and to maintain the separation distance, but commercially available spacers have not sufficiently performed their role. As a result, the cost of operating the cutter is increased, the operator is easily exposed to hazards, and the cutting performance and cutting quality are deteriorated.

The wire-type spacer is a wire spacer having a support portion at the height by bending the upper surface for fixing the wire and the lower surface contacting the cut material with a curved line. It is a two-stage deformation type which can change the separation distance by making two grooves on the insulation cap. However, when the cutting is performed, the rising melt adheres to the spacer ring on the rounded bottom surface, which interferes with the movement of the operator by pulling the torii, and when the wire is melted, the wire melts and breaks. Also, when using a separate jig, the contact support surface is unstable.

Tapered spacer

10 is a spacer manufactured by cutting and bending a steel sheet. An annular band that can be fixed to the spacer support leg and the torii cap is integrally manufactured. It is usable, but it can not control the distance. This spacer is forced to be attached to the cap by the operator, which can only trigger a hand error of the operator, and a minor mistake can lead to a serious accident due to the high temperature of the plasma arc. Because of the position of the machine that can turn off the power of the plasma cutter and the position of the machine, it is 10 m to 20 m so that the operator can operate the soil without turning off the power of the machine.

6. How to use without spacer

Since conventional spacers have such a problem, most of the plasma manual cutting workers are cutting without spacers. In this case, two to five nozzle tips are consumed per day, and the quality of the cut surface is very poor, requiring post-cutting.

7. Application of this invention

As described above, in the plasma cutting, the configuration of the arc output power source is a negative power source of the soil and a positive power source of the material to be cut.

When the plasma arc between the material to be cut and the soil is transferred, the transition arc is cut off by separating the bond of the metal to which the transition metal is bonded.

Maintaining the separation distance in the passive arc transfer cutting is very important to obtain a good cut surface and is a necessary requirement to extend the durability of the soil and consumables, and the maintenance of the separation distance is emphasized when the output current capacity is large.

In the plasma arc cutting method, the physical force of the arc blowing slag, the arc generating tool, the arc length, the heat source, and the output current are directly related to the cutting performance and the cutting quality.

(A) One of the spacers for the conventional plasma cutter torii is a wire spacer. The wire spacers have a two-step groove formed in the ceramic head cap or the heat-resistant resin head cap, and the length of the plasma flame is adjusted by moving the spacer clip in the two-step groove.

(B) Since the other one of the above-mentioned steel plate type spacers is forced to be attached to the cap as described above, the operator must make a mistake, and a small mistake can lead to a serious accident due to the high temperature of the plasma arc .

(C) The other is to allow the skilled craftsman to hold the tornado by hand and maintain a sensible distance.

The problem of the plasma arc arc spacer

(A) In addition to the above-mentioned risks, since the wire is brought into contact with the material to be cut, the friction area in the movement of the soil is wide and the surface of the material to be cut is roughened by molten metal scattered during the cutting process. There is a problem that the drag vibration is increased and the breakage becomes easy.

(B), the wire spacer clip must be assembled by holding the head cap by hand while the arc power is turned off. However, since the worker and the current supply device are far away, the power is turned on and the hand is burned with the high- There have been a few cases,

The present invention is an improvement of a spacer for supporting a plasma head at a distance over a material to be cut.

The present invention is to provide a spacer for a plasma torch which can adjust the separation distance in several steps by assembling a control band provided with a fixing band and a support leg with a control device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spacer for a plasma torch wherein a plurality of coupling grooves are provided in a connection passage of an adjustment band to move a fixing protrusion of a fixing band among a plurality of coupling grooves to adjust a separation distance.

An object of the present invention is to provide a spacer for a plasma soil trench in which an adjustment passage having a short life span is easily replaced by providing an access passage in a connection passage.

The present invention is to provide a spacer for a plasma torch wherein a handle for pressing and unfolding a fixed band is assembled to press the band of a handle to press and release the band, and the bar is tightly fixed to the plasma head by bending elasticity.

DISCLOSURE OF THE INVENTION The present invention is intended to provide a spacer for a plasma soil so that the thin width of the support leg thickness of the plasma spacer becomes a sliding width on the material to be cut so that the soil can move smoothly.

The present invention is to provide a spacer for a plasma ground electrode in which the metal bridge is coated with a Teflon resin coating excellent in heat resistance as a plastic coating to the support leg, thereby preventing adhesion of the molten metal fly ash.

The spacer for the plasma cutter of the present invention

A fixing band which is rolled round the circumferential groove of the electric insulator head of the plasma torch so as to be brought into close contact with the electrode by bending elasticity, an adjusting band which is attached to the fixing band by bending elasticity and has support legs on both sides, And a control band is supported on a fixing band and a separation distance adjustment device of a plasma cutting torch is provided.

The separation distance adjusting device may include a fixing protrusion provided on the right and left of the fixing band and coupled to the connection passage of the adjustment band, and a connection passage installed on the left and right of the adjustment band and adapted to transfer the fixing protrusion into the plurality of coupling grooves. Respectively.

The coupling grooves on both sides of the inner side of the connection passage are three to five, and the coupling grooves are arranged so that the deviation of the separation distance can be adjusted to 2 mm to 3 mm.

The connecting passage of the adjusting band is provided with a fixing protrusion access passage at the upper portion so that the adjusting band can be easily assembled when a plurality of adjusting bands are exchanged for one fixing band.

The fastening band is configured to allow the fastening band to be easily separated from the toothed head when the fastening band is first installed or replaced, or the fastening band coupled into the groove of the tooth-shaped head can be easily separated.

The support legs on the left and right sides of the adjustment band are provided so that the thickness width of the support legs is set to be the slide progression width with respect to the cutting movement progressing direction of the soil value,

A thermally resistant plastic coating, preferably a Teflon resin coating, is provided on the support legs of the control band so that molten metal scraps do not stick to the support legs. The molten metal artefact is attached to not only the material to be cut but also the spacer supporting leg, which causes migration of the soil, which prevents the adhesion of the molten metal scrap material surely, .

As described above, according to the present invention, the fixing band and the adjusting band can be assembled by the adjusting device to adjust the distance in several steps, and a plurality of connecting grooves are provided in the connecting passage of the adjusting band, It is easy to change the adjustment band with short life span by adjusting the separation distance by moving it in the groove and by setting the access passage in the connection channel. By pressing the handle of the handle by pressing the handle, The thin width of the supporting leg of the plasma spacer is made to be a sliding width on the material to be cut so that the cutting and cutting of the soil can be easily performed and the plastic covering including the heat resistant Teflon resin A spacer for a plasma ground electrode is provided which is prevented from adhering to molten metal scrap by coating.

Fig. 1 is a cross-
2 is a side view
3 is a perspective view of a plasma soil spacer
4 is a front view of the plasma soil spacer
Figure 5 is a top view of the separation band
Figure 6 is a side view and front view of the adjustment band
Figure 7 shows an example of a nozzle tip
Figure 8 shows an example of a nozzle tip
Fig. 9 is a diagram of a conventional wire spacer
Fig. 10 shows an example of a conventional iron plate spacer

This invention will be described in more detail with reference to the accompanying drawings.

The spacer for a plasma cutter according to the present invention comprises a fixing band 10 which is brought into close contact with the main surface groove of the electric insulation tongue head 50 of the plasma ground electrode by bending elasticity and a fixing band 10 which is brought into close contact with the fixing band 10 by bending elasticity, An adjusting band 20 provided with a supporting leg 23 and a separation distance adjusting device provided between the fixing band 10 and the adjusting band 20.

When the tundish spacer is assembled to the tundish head 50, the tundish head 50 is erected on the material to be cut with the two support legs 23 of the tundish spacer. The support legs 23 provided on the adjustment band 20 support the soil head 50 at a constant height above the material to be cut. The toothed head 50 is erected on the material to be cut with the toothed spacer and the toothed head 50 is moved so that the separation distance is kept constant to improve the cutting quality and increase the cutting efficiency. In addition, it is possible to easily adjust the separation distance in three to five steps according to the material to be cut or the moving speed of the toothed head, so that the optimum cutting quality and efficiency can be maintained along with the selection of the cutting current capacity in various cutting environments.

The spacing distance adjusting device 30 includes fixing protrusions 18 provided on the right and left sides of the fixing band 10 and coupled to the connecting passages of the adjusting band 20, And a connecting passage 36 for selecting the grooves 31, 32, 33, 34, and 35 to which the fixing protrusions 18 are to be inserted.

Three or five engagement grooves on both sides of the inner side of the connection passage 36 may be provided. The engaging grooves are disposed in the connecting passage so that the deviation of the distance can be adjusted from 2 mm to 3 mm.

Since the support legs 23 supporting the left and right sides of the soil body 50 are sliding widths of the thinner support leg thickness width 27 in the course of soil displacement cutting operation, The deterioration of the cutting quality which is made smooth and becomes larger as the cutting time goes back is reduced. The reason for this is that the material to be cut becomes irregular irregularities due to a large amount of molten metal melt during the cutting process, and if the sliding width is large during the trowel movement, the trowel movement becomes unstable on the uneven surface, .

A heat-resistant plastic sheath 25 is provided to prevent the molten metal scrap from adhering to the support legs 20 of the control band 20. [ The cover is formed in the form of a boot, or the support leg 23 is coated with a heat-resistant resin coating film. If the plastic covering 25, preferably a heat-resistant Teflon resin coating, is applied to the support leg 23, the molten metal non-product will not adhere to the leg, thereby reducing the tortuous movement disturbance and preventing the support leg 23 from being damaged The life of the band 20 becomes longer.

And the fixing boss 10 side fixing passage 18 entrance and exit passage 37 is provided above the connecting passage 30 of the adjusting band 20. Since the adjustment band 20 is easily damaged in the cutting process while the service life is long in the cutting of the fixing band 10, the adjustment band is used several times for one fixing band. The fixing protrusion 18 access passageway 37 allows the adjusting band 20 to be easily separated from the fixing band 10 or to be easily assembled. The process of separating the adjusting band 20 from the fixing band 10 is carried out in such a manner that the fixing protrusion 18 is released from the coupling groove and the fixing boss 18 is moved out of the adjusting band 20 in the access passage 37. [ (20), and the assembling process may be performed in the reverse order of the process.

The pushing handle 16 of the fixing band 10 protruded out of the adjustment band 20 in the opening 21 between the ends of the adjustment band. The handle 16 is composed of a left protruding portion 14 and a right protruding portion 15 which are formed by intersecting the both ends of the fixed band so as to enlarge the diameter when the both ends are pressed and pressed. In the embodiment, the intersecting right and left projecting portions intersect with each other through the left guide hole 13. When the left and right protrusions 14 and 15 are pressed together, the diameter of the fixing band 10 is enlarged and the fixing band 10 is inserted into the groove 53 of the tooth- It can be easily removed from inside. The diameter of the fixing band 10 is enlarged by using the handle 16 which is also pressed and unfolded when the fixing band 10 is inserted into the groove 53, thereby simplifying the assembly of the soil spacer.

Example of adjusting the separation distance of the support leg

The fixed band 10 is tightly fixed to the groove 53 of the soil head 50.

Left and right fixing projections 18 provided on the fixing band 10,

The adjustment band 20 is provided with a connection passage 36 provided with coupling grooves 31, 32, 33, 34, 35 and an access passage 37.

The adjusting band 20 is pushed and fixed to the fixing band 20 so that the supporting protrusion 18 is fitted into the access passage 37. [

The support protrusions 18 have escaped from the coupling grooves to the connection passage 36. [

The support protrusion 18 is fitted and fixed to the shortest distance coupling groove 31.

The support protrusions 18 were moved into the engaging grooves 32 to enlarge the separation distance by one step.

The support protrusions 18 were transferred to the engaging grooves 33 and the separation distance was further enlarged by one step.

The support protrusions 18 are moved into the engaging grooves 34 and the separation distance is further enlarged by one step.

The support protrusions 18 were transferred to the engaging grooves 35 and the separation distance was further enlarged by one step.

As a result, the Tocchi Spacer has demonstrated a five-step distance.

The separation distances of the coupling grooves 31, 32, 33, 34, and 35 in the five-stage separation distance adjustment demonstration are 2.5 mm, respectively.

The height of the coupling groove at the lower end of the support leg of the coupling groove 31 is a basic height h.

The height of the coupling groove at the lower end of the support leg of the coupling groove 32 is a basic height h - 2.5 mm.

The height of the engagement groove at the lower end of the support leg of the engagement groove 33 is a basic height h - 5 mm.

The height of the coupling groove at the lower end of the support leg of the coupling groove 34 is a basic height h - 7.5 mm.

The height of the coupling groove at the lower end of the support leg of the coupling groove 35 is a basic height h - 10 mm.

The five coupling grooves 31, 32, 33, 34, and 35 may change the length of the plasma flame by 10 mm.

10 denotes a fixed band,
Reference numeral 13 denotes a guide hole, reference numerals 14 and 15 denote intersecting protrusions, reference numeral 16 denotes a handle to be opened, reference numeral 17 denotes a spacing distance,
20 is a fixed band, 21 is a control band,
21 an opening, 23 a support leg, 27 a thickness width,
Reference numeral 30 denotes a regulating device, reference numerals 31, 32, 33, 34 and 35 denote coupling grooves, numeral 36 denotes a connecting passage, numeral 37 denotes an access passage,
50 is the tooth head, 51 is the nozzle tip, 53 is the groove, and 57 is the width of the flame.

Claims

In the plasma soil oxide spacer,
A fixing band which is rolled round the main surface groove of the electric insulator head of the plasma torch so as to be brought into close contact by bending elasticity,
An adjustment band which is attached to the fixed band by bending elasticity and has support legs on the right and left sides,
A control band provided between the fixed band and the adjustment band to support the adjustment band on the fixed band and at the same time to adjust the separation distance of the plasma cutter,
The separation distance adjusting device includes fixing protrusions provided on the left and right sides of the fixing band and coupled to the connection passage of the adjustment band,
And a connecting passage provided on the left and right sides of the adjusting band for moving the fixing protrusions into the plurality of coupling grooves.

The method according to claim 1,
The number of coupling grooves on the sides of the connection passage is 3 to 5,
The engaging grooves can adjust the deviation of the separation distance from 2 mm to 3 mm
A spacer for a plasma cutter torch characterized by disposition.

3. The method of claim 2,
Wherein the connecting passage of the adjusting band is provided with a passage for entering and exiting the fixing protrusion at an upper portion thereof.

The method according to claim 1,
The fixed band is provided with a handle for pressing and unfolding,
Wherein the pushing handle of the fixed band comprises a left protruding portion and a right protruding portion which intersect the both ends of the fixing band to enlarge the diameter when the two ends are pressed and pressed.

The method according to claim 1,
Wherein the support legs on the left and right sides of the adjustment band are provided such that the width of the support legs is a slide advancement width with respect to the traveling direction of the cutting of the soil.

The method according to claim 1,
And a heat-resistant plastic sheath is provided on a support leg of the adjustment band.