DE102007005316A1 - Quick-change tip design for plasma torch includes studs and grooves in opposite cylindrical surfaces of holder and tip, with prescribed angular dispositions - Google Patents

Abstract

The connection between the disposable tip and its holder (5) is configured as follows. Either the holder or the tip, has a cylindrical wall (41) with an outer surface (41a) and circular ring surface, and an outer diameter (D41a). The corresponding cylindrical wall on the tip or holder, has an inner surface and an inner diameter (D52), where D52 exceeds D41a. On the inner surface there are Nvor radial projections or studs (533) and Nver radial depressions forming grooves (431), where Nvor and Nver are non-zero and their sum is no greater than 5. Corresponding, inter-engaging studs and grooves profile the opposite outer surfaces. Should N = 5, the sum of any two adjacent center point angles (alpha , beta ; beta , gamma ; gamma , delta ; delta , eta ) through which studs or grooves are mutually-offset, is less than 180[deg] and the five center point angles (alpha , beta , gamma , delta , eta ) are of differing size. Alternatively, should N exceed 5, the sum of two adjacent center point angles through which studs or grooves are mutually-offset is less than 180[deg] and the center point angles have differing sizes, or at least two of them are of the same size. In this case, the sum of the respective doubled centerpoint angles arising, and the adjacent center point angles on both sides, is less than 180[deg] . Further mechanical details of construction, and variants based on the foregoing principles are described.

Description

The The present invention relates to a connection between a plasma torch wear part and a plasma torch wear part holder Plasma torch consumable and a plasma torch wear part holder.

It are plasma torches known from a plasma torch and a plasma burner head, with a quick-change closure with each other connectable exist. In the plasma burner head are the Parts of the plasma torch that wear out quickly as a result of operation and replaced more frequently Need to become. These are above all the electrode, the nozzle, the nozzle cap and the gas guide part, in particular the plasma gas guidance part. But also in the case of changing uses of the plasma process, for example, between cutting mild steel and cutting of stainless steel or when changing the Use of cutting on welding or vice versa, the Change from an electrode, nozzle, Nozzle protection cap, Gas guide member etc. be necessary to another or to another. To this To realize quickly, a quick change possibility makes sense.

to Avoidance of damage or z. B. for the preparation of correct supply connections should the quick change possibility a clear radial positioning or positioning along the scope of wearing parts Offer.

Of the Invention is therefore the object of such a quick change possibility for wearing parts of a Plasma torch provide.

According to the invention, this object is achieved by a connection between a plasma torch wear part and a plasma torch wear part holder, characterized in that either the plasma torch wear part holder or the plasma torch wear part has on its or its connection side a first cylinder wall having an outer surface and an annular surface and an outer diameter D41a and the one or more other having the plasma torch consumable holder and the plasma torch consumable on their or its connection side, a second cylinder wall with an inner surface and an inner diameter D52, wherein D52> D41a and on the inner surface circumferentially n _Before radial projections and n _Ver radial indentations, wherein n _Before, n _Ver ≥ 0 and n _Before + n _Ver = n ≥ 5, and on the outer surface an equal number of engaging therewith, in particular corresponding recesses or projections is provided , and in the case of n = 5, the sum of two adjacent center angles at which the projections and a recess are offset from each other is not ≥ 180 ° and the five center angles are different, or in case of n> 5, the sum of two adjacent center angles, among which the projections and a projection and a recess are offset from one another, is not ≥ 180 ° and the n> 5 center angles are different or at least two of n> 5 center angle are the same size, then in each case the sum of the respective doubly occurring center angle and the adjacent to both sides of the center angle is <180 °.

Furthermore, this object is achieved by a plasma torch wear part, characterized in that it has on its connecting side a cylinder wall having an outer surface and a circular surface, wherein on the outer surface circumferentially n _Ver radial recesses and n are provided _before radial projections, where n _Ver , n _before ≥ 0 and n _Ver + n _Before ≥ 5, and in the case of n = 5, the sum of two adjacent center angles, among which the protrusions and a recess are staggered with each other, is not ≥ 180 ° and the five center-point angles are different in size, or in the case of n> 5, the sum of two adjacent center-angles, among which the protrusions and a recess are offset from each other, is not ≥ 180 ° and the n> 5 center angles are different in size or at least two of the n> 5 center angle equal gr are oss, in which case the sum of the respective doubly occurring center angle and the angle of the center adjacent thereto on both sides is <180 °.

In addition, this object is achieved by a plasma torch wear part holder, characterized in that it has on its connecting side a cylinder wall with an inner surface, wherein on the inner surface circumferentially n _Vor radial projections and n _Ver radial recesses are provided, where n _Vor , n _Ver ≥ 0 and n _before + n _Ver ≥ 5, and in the case of n = 5, the sum of two adjacent center angles, among which the projections and a recess and a recess are staggered with each other, is not ≥ 180 °, and the five Center point angles are different in size, or in the case of n> 5, the sum of two adjacent center angles, among which the protrusions and a protrusion and a recess are offset from each other, is not ≥ 180 ° and the n> 5 center angle different are large or at least two of the n> 5 center angle are the same size, where dan n is the sum of the respective doubly occurring midpoint angle and that of it both sides adjacent center angles <180 °.

at the connection can be provided that the sum of two adjacent Center angles (α and β or β and γ or γ and δ or δ and ε or ε and α) ≤ 170 °.

According to one particular embodiment of the Invention can be provided that n = 5 and the sum second adjacent midpoint angle (α and β or β and γ or γ and δ or δ and ε or ε and α) is not repeated.

Besides that is conceivable that the Plasma torch consumable having the first cylinder wall and the plasma torch wear part mount having the second cylinder wall.

It may also be provided that the ratio of the areas of a projection and an associated recess is in the range of 1: 1 to 1: 4. At a z. B. rectangular groove and nose, as in the 6 and 7 shown, the area results from the product of B and T of the groove or nose.

It can also be provided that the ratio of the areas of the n _Before projections with each other and / or the n _Ver wells with one another in the range from 1: 1 to 1: 4.

In a particular embodiment n radial projections and n _Ver identical _Before are same radial recesses are provided.

advantageously, the depressions are rectangular grooves. But you can also choose another one Shape, such as B. triangular, arcuate, etc. have.

advantageously, is on the inside surface the second cylinder wall in the connecting direction before the projections and / or Wells a circumferential radially outwardly extending chamfer intended. This will introduce the first cylinder wall facilitated in the second cylinder wall.

In a further particular embodiment of the invention, it can be provided that n _Vor ≥ 5.

Alternatively, it is conceivable that n _Ver ≥ 5.

advantageously, is a cohesion device in holding together the plasma torch wear part and the plasma torch billet holder intended. This may for example comprise a clamping sleeve.

The Plasma torch consumable can a nozzle, an electrode, a nozzle protection cap or a gas guide part, in particular a plasma gas guidance part, be.

According to one particular embodiment of the Invention, the plasma torch wear part holder is an integral Part of a plasma torch.

alternative is the plasma torch wear part holder detachable with a plasma torch connected.

According to one particular embodiment of the Invention, the plasma torch is a plasma cutting torch.

alternative Can he use a plasma welding torch? be.

The under claims to the plasma torch wear part and the plasma torch wear part holder relate to advantageous developments of the same.

Of the Invention is the surprising Understanding that through the special number and arrangements of protrusions and corresponding ones Wells a simple and fast joining of Plasma torch wear part and Plasma torch consumable holder achieved without tilting. The circular ring surface just has to be attached the projections brought, that is in a joining position brought, and then rotated relative to the projections until the joining position is achieved, in the case of axially acting force, the projections and Recesses engage each other. This is special advantageous in situations where the plasma torch wear part and / or Plasma torch wear part holder not optically accessible is / are. The quick change can be done blind, so to speak.

Furthermore For example, the invention provides a connection between the plasma torch wear part and the plasma torch wear part holder with anti-rotation, low tolerance between the axes of the plasma torch wear part and the plasma torch wear part holder and high centricity.

Further Features and advantages of the invention will be apparent from the claims and the following description, in the two embodiments with reference to the schematic drawings are explained in detail. Showing:

1 a sectional view of a front part of a plasma burner head according to a particular embodiment of the invention;

2 a perspective view of a nozzle and a nozzle holder according to a particular embodiment of the present invention before connecting the same;

3 a similar view as 2 but also water supply and return channels are shown;

4 two perspective views of an electrode and an electrode holder before connecting the same;

5 a similar view as 4 but also water supply and return channels are shown;

6 a sectional view of the nozzle and nozzle holder of 2 in the joining position; and

7 a sectional view of the electrode and electrode holder of 4 in the joining position.

1 shows a plasma burner head 1 with a nozzle cap 2 a plasma gas guide member 3 , a nozzle 4 , a nozzle holder 5 , an electrode holder 6 , an electrode 7 , a nozzle cap holder 8th , an insulating part 8a and a nozzle cap 9 ,

In the 2 and 3 are each a nozzle 4 for a plasma cutting torch and a nozzle holder 5 represented for the nozzle. The nozzle 4 has a cylinder wall 41 with an outer surface 41a and a circular ring surface 42 the latter also fulfilling the function of the (second) support surface. The nozzle holder 5 has a cylinder wall 51 with an inner surface 51a and a support surface 546 on. The inner diameter D52 of the cylinder wall 51 is larger than the outer diameter D41a of the cylinder wall 41 , On the outside surface 41a are circumferentially five equal rectangular grooves, only two of which can be seen and identified by the reference numerals 431 and 435 are provided provided.

On the inner surface 51a are circumferentially provided five identical corresponding lugs, of which only three visible and with the reference numerals 532 . 533 and 534 Marked are.

In addition, the nozzle holder points 5 towards the nozzle 4 in front of the noses 532 to 534 an outwardly extending chamfer 52 on, through which the insertion of the nozzle 4 is relieved. The inner diameter D52 corresponds to the diameter at the upper edge of the chamfer 52 and provides a game S = (D52 - D41a) / 2. After passing the chamfer 52 It narrows to the inner diameter D51a to reduce the game S = (D51a - D41a) / 2 to near zero. This makes it possible to simplify the positioning while securing high centricity.

In the 3 are opposite the 2 additionally a water supply 53 and water return 54 and a water supply channel 43 and a water return channel 44 shown. This embodiment corresponds to 1 ,

To improve water cooling for the nozzle 4 are the water supply channel 43 and the water return channel 44 in the nozzle 4 incorporated. As a result, the cooling water reaches into an annular groove 45 , the most thermally stressed part of the nozzle 4 , the nozzle channel 46 , cools especially well. In contrast to 2 the cooling water is fed directly to this area. In the embodiment according to 2 can form a tributary flow through which a part of the cooling water, which then not to cool the nozzle channel 46 is available. It is possible through the design of the nozzle 4 and the nozzle cap 9 the ratio of the proportions of cooling water passing through the annular groove 45 the nozzle channel 46 and the conical outer surface 47 cool to set.

The improvement of the cooling of the nozzle channel while maintaining the cooling for the entire surface of the nozzle results from the incorporated water supply 43 and water return channels 44 and an expansion, ie enlargement of the conical areas thereof, in combination with a standard nozzle cap, for example. It is ensured that there is always a closed moving water film on the tapered portion of the nozzle, while flows through the annular groove around the nozzle channel most of the cooling medium. The ratio of the areas can be in the range of 3: 1 to 20: 1 (cooling channel: tapered outer surface).

The unique positioning of the nozzle 4 to the nozzle holder 5 through the noses and grooves serves to improve the cooling of the nozzle 4 , In addition, it is achieved by the lugs and grooves a simplification of the nesting together with high degree of centricity in the Endfügestellung.

The 4 shows the corresponding for an electrode 7 and an electrode holder 6 , The electrode 7 has a cylinder wall 71 with an outer surface 71a , a circular ring surface 72 and a support surface 746 on. The electrode holder 6 has a cylinder wall 61 with an inner surface 61a and a support surface 646 on. The inner diameter D61a of the Zy cylinder wall 61 is larger than the outer diameter D71a of the cylinder wall 71 , On the outside surface 71a are circumferentially five equal grooves, only two of which can be seen and denoted by the reference numerals 731 and 735 are provided, vorgese hen.

On the inner surface 61a are circumferentially provided five equally corresponding lugs, of which only three visible by the reference numeral 632 . 633 and 634 Marked are.

In addition, the electrode holder points 6 towards the electrode 7 in front of the noses 632 to 634 an outwardly extending chamfer 62 on, through which the insertion of the electrode 7 is relieved. The inner diameter D62 corresponds to the diameter at the upper edge of the chamfer 62 and provides a game S = (D62 - D71a) / 2. After passing the chamfer 62 It narrows to the inner diameter D52 to reduce the game to almost zero.

To improve the cooling of the electrode 7 is in the connection end a division into a water supply channel 73 and a water return channel 74 through a partition 75 and in the electrode holder 6 a partition 65 for division into a water supply channel 63 and a water return channel 64 (please refer 5 ) intended.

In the 6 are the grooves 431 to 435 the nozzle 4 in engagement with the noses 531 to 535 the nozzle holder 5 shown in the joining position. Since the sum of two adjacent center-point angles is the center-point angles α, β, γ, δ, and ε, among which the grooves 431 to 435 are arranged, not ≥ 180 ° and the five center angles are different sizes, only in this joining position, all lugs can be engaged with all the grooves. In all other radial positions, called joining positions, the annular surface is located 42 on at least three noses.

7 shows the corresponding joining position and the corresponding conditions for the joining of the electrode 7 and electrode holder 6 ,

In the embodiments shown above are the depressions and protrusions Noses and grooves arranged and dimensioned so that a twisting from nozzle and nozzle holder or Electrode and electrode holder after reaching the joining position not possible anymore is.

The in the present description, in the drawings and in the claims disclosed features of the invention can both individually and also in any combination for the realization of the invention in its various embodiments be essential.

1

Plasma torch head

2

nozzle cap

3

Plasma gas guiding part

4

jet

5

nozzle holder

6

electrode holder

7

electrode

8th

Nozzle protection cap holder

8a

Insulation

9

Nozzle cap

41

cylinder wall

41a

outer surface

42

Annular surface

43

Water flow channel

44

Water return channel

45

ring groove

46

nozzle channel

47

outer surface

51

cylinder wall

51a

palm

52

chamfer

53

water flow

54

Water return

61

cylinder wall

61a

palm

62

chamfer

63

Water flow channel

64

Water return channel

71

cylinder wall

71a

outer surface

72

Annular surface

73

Water flow channel

74

Water return channel

431, 432, 433, 434, 435

groove

531, 532, 533, 534, 535

nose

546

bearing surface

631 632, 633, 634, 635

nose

646

bearing surface

65

partition wall

731, 732, 733, 734, 735

groove

746

bearing surface

75

partition wall

B

middle Width of the noses and grooves

D41a

outer diameter

D51a

Inner diameter

D52

Innendurchmessser

D61a

Inner diameter

D62

Inner diameter

D71a

outer diameter

PG

plasma gas

SG

secondary gas

T

middle Depth or height of Noses and grooves

WR1, WR2

Water returns

WV1, WV2

Wasservorläufe

a, b, c, d, e

Arch dimensions between the Symmetry axes of the lugs or grooves on the circumference of the diameter D in mm

α, β, γ, δ and ε

Central angle between the symmetry axes of the lugs or grooves

Claims (39)

A connection between a plasma torch wear part and a plasma torch wear part holder, characterized in that either the plasma torch wear part holder or the plasma torch wear part has on its or its connection side a first cylinder wall having an outer surface and an annular surface ( 62 ) and an outer diameter D41a, and the other one of the plasma torch wear member holder and the plasma torch wear portion has a second cylinder wall with an inner surface and an inner diameter D52 on its connecting side, where D52> D41a, and circumferential on the inner surface n _before radial projections and n _Ver radial depressions, where n _Vor , n _Ver ≥ 0 and n _Vor + n _Ver = n≥ 5, and on the outer surface an equal number of engaging therewith, in particular corresponding recesses or projections is provided, and in Case of n = 5, the sum of two adjacent center angles (α and β or β and γ or γ and δ or δ and ε or ε and α), under which the projections or depressions or a projection and a recess offset from one another are not ≥ 180 ° and the five midpoint angles (α, β, γ, δ, ε) are different in size, or in the case of n> 5 is the sum of two adjacent center-point angles (α and β or β and γ or γ and δ or δ and ε or ε and α), under which the projections or recesses or a projection and a recess are arranged offset from each other, is not ≥ 180 ° and the n> 5 midpoint angles (α, β, γ, δ, ε) are different in size or at least two of the n> 5 center angles (α, β, γ, δ, ε) are the same size, then in each case the sum of the respective doubly occurring midpoint angle (α or β or γ or δ or ε) and the midpoint angles adjacent thereto on both sides (α and γ or β and δ or γ and ε or γ and α or ε and β) <180 ° is. Compound according to Claim 1, characterized that the Sum of two adjacent midpoint angles (α and β or β and γ or γ and δ or δ and ε or ε and α) ≤ 170 °. Compound according to Claim 1 or 2, characterized that n = 5 and the sum of second adjacent midpoint angles (α and β or β and γ or γ and δ or δ and ε or ε and α) not repeated. Compound according to one of Claims 1 to 3, characterized that this Plasma torch consumable having the first cylinder wall and the plasma torch wear part mount having the second cylinder wall. Compound according to one of claims 1 to 4, characterized that this relationship the surfaces from a tab and an associated recess in the area from 1: 1 to 1: 4. A compound according to any of the preceding claims characterized in that the ratio of the surfaces of the n _Before projections with each other and / or the n _Ver wells with one another in the range from 1: 1 to 1: 4. A compound according to any one of claims 1 to 5, characterized in that n radial projections and n _Ver identical _Before are same radial recesses are provided. Connection according to one of claims 1 to 7, characterized in that the recesses have rectangular grooves ( 431 . 432 . 433 . 434 . 435 ; 731 . 732 . 733 . 734 . 735 ) are. Connection according to one of the preceding claims, characterized in that on the inner surface of the second cylinder wall in the connection direction in front of the projections and / or recesses a circumferential radially outwardly extending bevel (FIG. 52 . 62 ) is provided. Compound according to one of the preceding claims, characterized in that n _Vor ≥ 5. Compound according to one of Claims 1 to 9, characterized in that n _Ver ≥ 5. A compound according to any one of the preceding claims, characterized characterized in that a A retainer for holding together the plasma torch wear part and the plasma torch wear part holder is provided. Connection according to one of the preceding claims, characterized in that the plasma torch wear part has a nozzle ( 4 ), an electrode ( 7 ), a nozzle cap ( 9 ) or a Gasfüh tion part, in particular a plasma gas guide part ( 3 ) is. A compound according to any one of the preceding claims, characterized characterized in that the plasma torch wear part holder is an integral part of a plasma torch. Compound according to one of Claims 1 to 13, characterized that the Plasma torch consumable holder detachable with a plasma torch connected is. Compound according to one of claims 1 to 15, characterized gekennuzeichnet, that the Plasma burner is a plasma cutting torch. Compound according to one of Claims 1 to 15, characterized that the Plasma torch a plasma welding torch is. Plasma torch wear part, characterized in that it has on its connection side a cylinder wall with an outer surface and an annular surface ( 62 ), wherein on the outer surface ( 41a ) N _Ver radial recesses and n are provided _{in front of} radial projections circumferentially, wherein n _Ver, n _Before ≥ 0 and n _Ver + n is _before ≥ 5, and in the case of n = 5 the sum of two adjacent central angles (α and β or β and γ or γ and δ or δ and ε or ε and α), among which the projections or recesses or a projection and a depression are arranged offset with each other, not> 180 ° and the five center angle (α, β, γ, δ, ε) are of different sizes, or in the case of n> 5, the sum of two adjacent center angles (α and β or β and γ or γ and δ or δ and ε or ε and α), among which the projections or Are not ≥ 180 ° and the n> 5 center angles (α, β, γ, δ, ε) are of different sizes or at least two of the n> 5 center angles (α, β, γ, δ, ε) are the same size, in which case in each case the sum e from the respective doubly occurring midpoint angle (α or β or γ or δ or ε) and the midpoint angles adjacent thereto (α and γ or β and δ or γ and ε or γ and α or ε and β) <180 ° is. Plasma torch wear part according to claim 18, characterized characterized in that Sum of two adjacent midpoint angles (α and β or β and γ or γ and δ or δ and ε or ε and α) ≤ 170 °. Plasma torch wear part according to claim 18 or 19, characterized in that n = 5 and the sum of second adjacent midpoint angles (α and β or β and γ or γ and δ or δ and ε or ε and α) not repeated. Plasma torch wear part according to one of claims 18 to 20, characterized in that the relationship the surfaces from a tab and an associated recess in the area from 1: 1 to 1: 4. Plasma torch wear part according to one of claims 18 to 21, characterized in that the ratio of the areas of the n projections in _{front of} each other and / or the n _Ver recesses with each other in the range of 1: 1 to 1: 4. Plasma torch wear part according to any one of claims 18 to 21, characterized in that n radial projections and n _Ver identical _Before are same radial recesses are provided. Plasma torch wear part according to one of Claims 18 to 23, characterized in that the depressions have rectangular grooves ( 431 . 432 . 433 . 434 . 435 ; 731 . 732 ; 733 ; 734 ; 735 ) are. Plasma torch wear part according to one of claims 18 to 24, characterized in that n _Ver ≥ 5. Plasma torch wear part according to one of claims 18 to 24, characterized in that n _Vor ≥ 5. Plasma torch wear part according to one of Claims 18 to 26, characterized in that it has a nozzle ( 4 ), an electrode ( 7 ), a nozzle cap ( 9 ) or a gas guide part, in particular a plasma gas guide part ( 3 ) is. Plasma torch wear part holder, characterized in that on its connection side a cylinder wall ( 51 ; 61 ) with an inner surface ( 51a ; 61a ), wherein on the inner surface ( 51a ; 61a ) Circumferentially n radial grooves are _Before radial projections and n _Ver are provided, where n _Before, n _Ver ≥ 0 and n _before + n _Ver is ≥ 5, and in the case of n = 5 the sum of two adjacent central angles (α and β or β and γ or γ and δ or δ and ε or ε and α), under which the projections or recesses or a projection and a depression are offset from each other, not ≥ 180 ° and the five center angle (α, β, γ, δ, ε) are of different sizes, or in the case of n> 5, the sum of two adjacent center angles (α and β or β and γ or γ and δ or δ and ε or ε and α), among which the projections or Depressions or a projection and a depression are arranged offset from each other, is not ≥ 180 ° and the n> 5 midpoint angles (α, β, γ, δ, ε) are different in size or at least two of the n> 5 center angles (α, β, γ, δ, ε) are the same size, then in each case the sum of the respective doubly occurring midpoint angle (α or β or γ or δ or ε) and the midpoint angles adjacent thereto on both sides (α and γ or β and δ or γ and ε or γ and α or ε and β) <180 ° is. Plasma torch wear part holder according to claim 28, characterized in that the Sum of two adjacent midpoint angles (α, β, γ, δ, ε) ≤ 170 °. Plasma torch wear part holder according to claim 28 or 29, characterized in that n = 5 and the sum second adjacent midpoint angle (α and β or β and γ or γ and δ or δ and ε or ε and α) is not repeated. Plasma torch wear part according to one of claims 28 to 30, characterized in that the relationship the surfaces from a tab and an associated recess in the area from 1: 1 to 1: 4. Plasma torch wear part holder according to one of claims 28 to 31, characterized in that the ratio of the areas of the n projections in _{front of} each other and / or the n _Ver recesses with each other in the range of 1: 1 to 1: 4. Plasma torch wear part according to one of Claims 28 to 31, characterized in that n equal radial projections are provided in _{front of the} same radial projections and n _Ver . Plasma torch wear part holder according to one of Claims 28 to 33, characterized in that the projections have rectangular lugs ( 531 . 532 . 533 ) are. Plasma torch wear part holder according to one of claims 28 to 34, characterized in that on the inner surface ( 51a ; 61a ) of the cylinder wall ( 51 ; 61 ) in the direction of connection on the support side before the projections and / or recesses a circumferential radially outwardly extending bevel ( 52 . 62 ) is provided. Plasma torch wear part mount according to one of claims 28 to 35, characterized in that n _Vor ≥ 5. A plasma torch wear part holder according to any one of claims 28 to 35, characterized in that n _Ver ≥ 5. Plasma torch wear part holder after one of claims 28 to 37, characterized in that they are an integral part a plasma burner is. Plasma torch wear part holder after one of claims 28 to 37, characterized in that they are equipped with a plasma torch releasably connectable is.