DE102017104649A1 - Chisel arrangement and method for supporting a round shank chisel - Google Patents

Abstract

Disclosed is first a chisel arrangement (1) with a chisel holder (2) and a chisel holder (2) inserted round shank chisel (3), a cylindrical chisel shank (18), in an axial direction (22) to the chisel shank (18) then a Support surface (19) projecting in a direction perpendicular to the axial direction (22) extending radial direction of the round shank chisel (3), and further in the axial direction (22) to a carbide tip (4) tapered chisel head (20), wherein the chisel shaft (18) is mounted in a cylindrical wear sleeve (11) in a receiving bore (5) of the chisel holder (2) and the bearing surface (19) rests on a support surface (6) of the chisel holder (2) which is perpendicular to the receiving bore (5) , A method for supporting a round shank chisel (3) in such a chisel arrangement (1) is also disclosed. In order to secure the wear sleeve (11) insensitive to wear in the receiving bore (5), it is proposed to provide such a press fit between a cylindrical outer surface (14) of the wear sleeve (11) and a cylindrical inner surface (12) of the receiving bore (5) to provide that the wear sleeve (11) by friction between the inner surface (12) and the outer surface (14) in the receiving bore (5) is supported.

Description

The invention relates first of all to a bit assembly comprising a bit holder and a round shank bit inserted in the bit holder, comprising a cylindrical bit shank in an axial direction on the bit shank, a bearing surface projecting in a radial direction of the round shank chisel perpendicular to the axial direction, and then further a shank bit the axial direction has up to a carbide tip tapered chisel head, wherein the chisel shank is mounted in a cylindrical wear sleeve in a receiving bore of the chisel holder and the bearing surface rests on a vertical to the receiving bore support surface of the chisel holder. The invention further relates to a method for supporting a round shank chisel in such a chisel arrangement.

Such chisel arrangements are used on milling rollers with which solid surface, in particular road surfaces are removed. In the operation of such milling drums wear not only the round shank bit, but also the mounting holes of the bit holder. Large forces transverse to the axial direction lead to a "knocking out" of the initially cylindrical receiving bore, whose cross-section over the life is increasingly elliptical. This change in cross section affects the storage of the round shank bit and its rotation about the axial direction.

To avoid changing the chisel holder, hit DE 10 2011 051 584 A1 suggests, in such a chisel arrangement, the wear sleeve in a thread in the receiving bore and unscrew when wearing out and replace. However, the thread required for removing and re-screwing the wear sleeve in the receiving bore is only limited use after prolonged operation of the bit assembly.

task

The invention has for its object to attach the wear sleeve wear insensitive in the receiving bore.

solution

Starting from the known bit arrangement is proposed according to the invention to provide such a press fit between a cylindrical outer surface of the wear sleeve and a cylindrical inner surface of the receiving bore, that the wear sleeve is held by frictional engagement between the inner surface and the outer surface in the receiving bore. The frictional engagement replaces the positive connection in the thread of the known bit arrangement and reduces the demands on the surface of the receiving bore for replacing the wear sleeve.

Chisel arrangements according to the invention are preferably mounted on a milling drum having a cylindrical surface in such a manner that the axial direction is set against a radial direction of the milling drum by the hard metal tip of the round shank chisel in a direction of movement of the surface and in operation of the milling drum the carbide tip in the direction of movement into a milled material penetrates.

Preferably, on a milling drum according to the invention the bit holder consists of a change holder and a base holder, wherein the change holder is connected to the base holder and the base holder with the surface. The change holder that is particularly affected by wear can be easily exchanged.

Preferably, on such a milling drum according to the invention, the changeover holder on a shaft which is inserted substantially in the axial direction in the base holder. The change holder can then be changed very easily.

Preferably, on such a milling drum according to the invention, the changeover holder has at least one tooth running transversely to the axial direction and the base holder has a corresponding counter-toothing, wherein the tooth engages in the counter-toothing. The tooth flanks of the tooth and the counter teeth divert the forces acting on the round shank chisel into the basic holder.

Preferably, a plurality of the teeth in the axial direction are arranged one behind the other on such a milling drum according to the invention. The load capacity of the teeth by the force acting on the round shank chisel forces is increased.

Preferably, the base holder is welded to the surface of the milling drum on a milling drum according to the invention. The basic holder is so easily and permanently connected to the milling drum.

Starting from the known method is proposed according to the invention to provide such a press fit between a cylindrical outer surface of the wear sleeve and a cylindrical inner surface of the receiving bore, that the wear sleeve is held by frictional engagement between the inner surface and the outer surface in the receiving bore. The inventive method is carried out by using a chisel arrangement according to the invention and is characterized equally by the advantages mentioned above.

Preferably, in a method according to the invention, the wear sleeve is inserted with a clearance fit into the receiving bore and widened in the receiving bore in such a way that the press fit is formed. The effort required to insert the wear sleeve is so significantly reduced.

Preferably, in such a method according to the invention, the wear sleeve is held under a bias when inserted into the receiving bore by means of a biasing ring, wherein the wear sleeve rebounds in the receiving bore by loosening the bias. An automatically auffedernde wear sleeve requires no additional effort to form the interference fit. Alternatively, the wear sleeve may be radially expanded or compressed in the axial direction from the inside mechanically or hydraulically in order to produce the interference fit.

Preferably, in such a method according to the invention, one of the surfaces of a cylindrical inner surface of the biasing ring and the cylindrical outer surface of the wear sleeve on a radially projecting spring on which when inserted into the receiving bore another of the surfaces bears, having a radially recessed groove, wherein the Releasing the preload, the spring engages in the groove. The biasing ring is fixed together with the wear sleeve on the receiving bore.

Preferably, in such a method, the support surface of the bit holder is formed on the biasing ring. The wear sleeve then ends at the latest in the plane of the support surface. The biasing ring also serves as a wearing part and is replaced with the wear sleeve.

list of figures

• 1 eine erste erfindungsgemäße Meißelanordnung,
• 2a/b ein Detail der Meißelanordnung,
• 3 ein Detail einer Fräswalze mit der Meißelanordnung
• 4 ein weiteres Detail der Meißelanordnung,
• 5 eine zweite erfindungsgemäße Meißelanordnung,
• 6a/b eine dritte erfindungsgemäße Meißelanordnung,
• 7 eine vierte erfindungsgemäße Meißelanordnung und
• 8a/b eine fünfte erfindungsgemäße Meißelanordnung und
• 9a/b eine sechste erfindungsgemäße Meißelanordnung.

The invention will be explained below with reference to exemplary embodiments. Show it

• 1 a first chisel arrangement according to the invention,
• 2a / b a detail of the bit arrangement,
• 3 a detail of a milling drum with the chisel arrangement
• 4 another detail of the bit arrangement,
• 5 a second chisel arrangement according to the invention,
• 6a / b a third chisel arrangement according to the invention,
• 7 a fourth chisel arrangement according to the invention and
• 8a / b a fifth chisel arrangement according to the invention and
• 9a / b a sixth chisel arrangement according to the invention.

The in the 1 to 4 shown first chisel arrangement according to the invention 1 has a chisel holder 2 and a round shank chisel 3 with a carbide tip 4 on.

The chisel holder 2 has a receiving bore 5 and one to the receiving bore 5 vertical support surface 6 on. The chisel holder 2 is designed as a change holder and points to one of the support surface 6 opposite side 7 a shaft 8th with a longitudinal axis 9 essentially on the carbide tip 4 tapers.

The chisel holder 2 has a bias ring 10 on, on which the support surface 6 is formed, and one in the biasing ring 10 and in the receiving hole 5 used cylindrical wear sleeve 11 ,

The preload ring 10 has one of a cylindrical inner surface 12 radially projecting spring 13 and the wear sleeve 11 one in a cylindrical outer surface 14 recessed groove 15 on. The wear sleeve 11 also has an outer surface 14 axially separating joint 16 on. In a relaxed state, not shown, the outer surface 14 the wear sleeve 11 opposite the wear sleeve 11 and the receiving bore 5 an excess.

The wear sleeve 11 is initially compressed radially and the biasing ring 10 such over the wear sleeve 11 preassembled that spring 13 - as in 2a shown - below the groove 15 on the outside surface 14 the wear sleeve 11 is applied. The feather 13 - and with it the outer surface 14 the wear sleeve 11 in this preassembled state - facing the receiving bore 5 an undersize.

For inserting the wear sleeve 11 becomes the lower end projecting from this preassembled unit 17 in the axial direction in the receiving bore 5 introduced until the preload ring 10 on the chisel holder 2 is applied, and then the wear sleeve 11 in the axial direction further into the preload ring 10 pressed or beaten until - as in 2 B shown in detail - the spring 13 in the groove 15 locks.

The wear sleeve 11 then lies under interference fit with its outer surface 14 in the location hole 5 and the inner surface 12 of the preload ring 10 at. The press fit causes the wear sleeve 11 solely by friction in the receiving bore 5 and the preload ring 10 - And thus the preload ring 10 at the receiving hole 5 - is held.

The round shank chisel 3 is rotationally symmetrical to the axial direction and initially has a cylindrical drill collar 18 on, then on this a bearing surface 19 projecting perpendicular to the axial direction, and further in the axial direction, a tapered chisel head 20 with the soldered carbide tip 4 , At the chisel shaft 18 points the round shank chisel 3 a clamping sleeve, not shown.

The round shank chisel 3 gets into the wear sleeve 11 so pressed or hammered that its bearing surface 19 on the support surface 6 of the chisel holder 2 is applied. In the clamping sleeve is the round shank chisel 3 rotatably supported.

The chisel holder 2 is with his shaft 8th so in a not shown, on a surface 21 a likewise not shown milling drum welded basic holder inserted that - as in 3 shown schematically - an axial direction 22 of the pick 3 at an angle 23 from about 45 ° against a through the carbide tip 4 extending radial direction 24 the milling drum is turned on.

In operation, the milling drum is so around its roll axis 25 driven that the round shank chisel 3 with the carbide tip 4 proceeding in a direction to the radial direction 24 vertical - ie to the surface 21 tangential - direction of movement 26 penetrate into a milled material, not shown, for example, in a paved area.

To the chisel holder 2 is one of the support surface 6 in the direction of movement 26 in the middle upstream deflector 27 molded for the milled material: the deflector 27 surmounted the supporting surface 6 in the axial direction 22 and has a circular arc-shaped enclosure 28 on. During operation of the milling drum, the deflector avoids 27 largely penetration of the milled material between the support surface 6 and the pick 3 , By the rotation of the round shank chisel 3 in the wear sleeve 11 will also be between the support surface 6 and the pick 3 penetrated material discharged.

A worn during operation round pick 3 can at its lower end 17 from the wear sleeve 11 pressed or knocked out and replaced.

In the 5 shown second chisel arrangement according to the invention 29 essentially corresponds to the first bit arrangement 1 , but has no deflector. The mounting bracket further shown in the figure 30 has a substantially cylindrical neck 31 on, with a hexagonal cross section and a radial to the axial direction 32 projecting nose 33 at the bottom 34 a radially projecting circumferential collar 35 in the middle of the neck 31 and a radially mounted handle 36 at the upper end 37 ,

For mounting the preassembled unit made of wear sleeve 38 and preload ring 39 and for disassembling a worn wear sleeve 38 becomes the lower end of the mounting bracket 30 axially loose in the wear sleeve 38 introduced, with the nose 33 in the fugue 40 is guided. By turning the mounting bracket 30 around the axial direction 32 gets the nose 33 under the wear sleeve 38 guided.

When inserting into the mounting hole 41 is the wear sleeve 38 so on the mounting bracket 30 held and can by pressure on the upper end of the mounting bracket 30 that's over the collar 35 is transmitted through the biasing ring 39 pressed or beaten.

For removing a worn wear sleeve 38 becomes a tensile force in the axial direction 32 over the nose 33 transferred and the wear sleeve 38 from the receiving hole 41 taken.

The in the 6a and 6b shown third chisel arrangement according to the invention 42 also corresponds substantially to the first bit arrangement 1 , being on the side of the bit holder 43 and in the direction of movement 44 essentially in front of the chisel head 45 is also a spoiler 46 screwed on: The spoiler 46 surmounted the supporting surface 47 in the axial direction 48 and is in the direction of movement 44 seen next to the chisel head 45 arranged.

Instead of a shaft, the chisel holder points 43 five in the axial direction 48 arranged one behind the other, each transverse to the axial direction 48 lying teeth 49 on, in a corresponding counter-toothing 50 of the welded to the milling drum, not shown basic holder 51 intervention.

During operation of the milling drum, the spoiler passes 46 a portion of the milled material from the chisel head 45 and thus causes an asymmetric flow of the round shank chisel with respect to the chisel axis, which increases its rotation about the chisel axis.

The deflector 52 and the spoiler 46 are surface hardened to reduce wear from the milled material.

Also in 7 shown fourth chisel arrangement according to the invention 53 essentially corresponds to the first bit arrangement 1 , where deviating only the bit holder 54 on the surface 55 the milling drum not shown is welded.

In a fifth bit arrangement according to the invention 56 according to the 8a and 8b is the same round pick 57 in a substantially tubular chisel holder welded to the milling drum, not shown 58 used. On the chisel holder 58 is a deflector 59 placed.

The deflector 59 has one on the pipe end 60 of the chisel holder 58 resting retaining ring 61 on, on the chisel holder 58 screwed on. The chisel shaft 62 of the pick 57 is through the retaining ring 61 into the bit holder 58 plugged in. On the retaining ring 61 is a collar 63 formed in the axial direction 64 over the support surface 65 protrudes and the gap between chisel head 66 and support surface 65 protects against the milled material.

The chisel holder 67 the sixth bit arrangement according to the invention 68 according to the 9a and 9b essentially corresponds to the bit holder 2 the first chisel arrangement 1 , The carbide tip 69 of the pick 70 the sixth bit arrangement 68 is coated with polycrystalline diamond.

The preload ring 71 the sixth bit arrangement 68 has no spring, but lies in the in 9b shown assembled state completely in the groove 72 of the preload ring 71 , The wear sleeve 73 is under compressive stress with its outer surface 74 in the receiving hole 75 and in a cylindrical inner surface 76 in the chisel head 77 at. The chisel shaft 78 lies with play in the wear sleeve 73 while the chisel head 77 by friction on the wear sleeve 73 and the wear sleeve 73 on the chisel holder 67 is held. With one-sided wear of the round shank chisel 70 This can be done using a key 79 around the axial direction 80 to be twisted.

LIST OF REFERENCE NUMBERS

1

bit assembly

2

toolholders

3

Attack cutting tools

4

Carbide tip

5

location hole

6

support surface

7

the support surface opposite side

8th

shaft

9

Longitudinal axis of the shaft

10

preloading ring

11

wear sleeve

12

Inner surface of the preload ring and the receiving bore

13

feather

14

Outer surface of the wear sleeve

15

groove

16

Gap

17

lower end of the wear sleeve

18

drill collar

19

bearing surface

20

chisel head

21

Surface of the milling drum

22

axially

23

angle

24

radial direction

25

roll axis

26

movement direction

27

deflector

28

mount

29

bit assembly

30

mounting bracket

31

Support

32

axially

33

nose

34

lower end

35

collar

36

handle

37

top end

38

wear sleeve

39

preloading ring

40

Gap

41

location hole

42

bit assembly

43

toolholders

44

movement direction

45

chisel head

46

spoiler

47

support surface

48

axially

49

tooth

50

counter teeth

51

base holder

52

deflector

53

bit assembly

54

toolholders

55

Surface of the milling drum

56

bit assembly

57

Attack cutting tools

58

toolholders

59

deflector

60

pipe end

61

retaining ring

62

drill collar

63

collar

64

axially

65

support surface

66

chisel head

67

toolholders

68

bit assembly

69

Carbide tip

70

Attack cutting tools

71

preloading ring

72

groove

73

wear sleeve

74

Outer surface of the wear sleeve

75

location hole

76

Inner surface of the chisel head

77

chisel head

78

drill collar

79

key

80

axially

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011051584 A1 [0003]

Claims (10)

Chisel arrangement (1, 29, 42, 53, 56, 68) with a chisel holder (2, 43, 54, 58, 67) and a round shank chisel (3, 57) inserted into the chisel holder (2, 43, 54, 58, 67) , 70), a cylindrical drill shank (18, 62, 78), in an axial direction (22, 32, 48, 63, 80) on the drill shank (18, 62, 78) then a bearing surface (19) in a perpendicular to the axial direction (22, 32, 48, 63, 80) extending radial direction of the round shank chisel (3, 57, 70) protrudes, and then further in the axial direction (22, 32, 48, 63, 80) up to a carbide tip (4, 69) tapered chisel head (20, 45, 66, 77), wherein the chisel shank (18, 62, 78) in a cylindrical wear sleeve (11, 38, 73) in a receiving bore (5, 41, 75) the chisel holder (2, 43, 54, 58, 67) is mounted and the support surface (19) on a to the receiving bore (5, 41, 75) vertical support surface (6, 47, 65) of the chisel holder (2, 43, 54 , 58, 67), geke nnzeichnet by such a press fit between a cylindrical outer surface (14, 74) of the wear sleeve (11, 38, 73) and a cylindrical inner surface (12) of the receiving bore (5, 41, 75) that the wear sleeve (11, 38, 73) by frictional engagement between the inner surface (12) and the outer surface (14, 74) in the receiving bore (5, 41, 75) is supported. A milling drum having a cylindrical surface (21, 55) on which are mounted chisel arrangements (1, 29, 42, 53, 56, 68) according to the preceding claim such that in each case the axial direction (22, 32, 48, 63, 80) against a through the hard metal tip (4, 69) of the round shank chisel (3, 57, 70) extending radial direction (24) of the milling drum in a direction of movement (26, 44) of the surface (21, 55) is employed and during operation of the milling drum, the hard metal tip (4, 69) in the direction of movement (26, 44) penetrates into a milled material. Milling roll according to the preceding claim, characterized in that the bit holder (2, 43, 54, 58, 67) consists of a change holder and a base holder (51), wherein the change holder with the base holder (51) and the base holder (51) the surface (21, 55) is connected. Milling roll according to the preceding claim, characterized in that the change holder has a shank (8) which is inserted substantially in the axial direction (22, 32, 80) in the basic holder. Milling roller after one of Claims 2 to 4 , characterized in that the change holder at least one transverse to the axial direction (48) extending tooth (49) and the base holder (51) has a corresponding counter-toothing (50), wherein the tooth (49) engages in the counter-toothing (50). Milling roll according to the preceding claim, characterized in that a plurality of the teeth (49) in the axial direction (48) are arranged one behind the other. Milling roller after one of Claims 2 to 6 , characterized in that the base holder (51) with the surface (21) of the milling drum is welded. Method for supporting a round shank chisel (3, 57, 70) in a chisel holder (2, 43, 54, 58, 67), wherein the round shank chisel (3, 57, 70) has a cylindrical chisel shank (18, 62, 78) in one Axial direction (22, 32, 48, 63, 80) on the drill collar (18, 62, 78) then a bearing surface (19) extending in a direction perpendicular to the axial direction (22, 32, 48, 63, 80) extending radial direction of Round shank chisel (3, 57, 70) protrudes, and further then in the axial direction (22, 32, 48, 63, 80) to a carbide tip (4, 69) tapered chisel head (20, 45, 66, 77) , and the bit shank (18, 62, 78) in a cylindrical wear sleeve (11, 38, 73) in a receiving bore (5, 41, 75) of the chisel holder (2, 43, 54, 58, 67) is inserted such that the support surface (19) rests on a support surface (6, 47, 65) of the chisel holder (2, 43, 54, 58, 67) perpendicular to the bore, characterized by such a press fit between n a cylindrical outer surface (14, 74) of the wear sleeve (11, 38, 73) and a cylindrical inner surface (12) of the receiving bore (5, 41, 75) that the wear sleeve (11, 38, 73) by frictional engagement between the inner surface (12) and the outer surface (14, 74) in the receiving bore (5, 41, 75) is supported. Method according to the preceding claim, characterized in that the wear sleeve (11, 38, 73) is inserted with a clearance fit in the receiving bore (5, 41, 75) and in the receiving bore (5, 41, 75) is widened such that forms the press fit. Method according to the preceding claim, characterized in that the wear sleeve (11, 38, 73) during insertion into the receiving bore (5, 41, 75) by means of a biasing ring (10, 39, 71) is held under a bias and in the receiving bore (5, 41, 75) by releasing the bias springs.

Images