WO2013156436A2

WO2013156436A2 - Tool insert for a rotor of a rotary impact crusher

Info

Publication number: WO2013156436A2
Application number: PCT/EP2013/057792
Authority: WO
Inventors: Heiko Friederichs; Baris Irmak; Bernhard Moosmann
Original assignee: Betek Gmbh & Co. Kg
Priority date: 2012-04-19
Filing date: 2013-04-15
Publication date: 2013-10-24
Also published as: WO2013156436A3; EP2879797A2; DE102012103451A1

Abstract

The invention relates to a tool insert for a rotor of a rotary impact crusher, comprising a mallet, which has a head having a working part and which has a fastening base, wherein the fastening base has a front clamping surface facing in the advancing direction and a rear clamping surface directed oppositely toward the back face. According to the invention, in order to improve the operational safety of a rotary impact crusher, in the area of the rear clamping surface, a boss protrudes rearward beyond the rear clamping surface, wherein the boss is arranged between two clamping surface parts of the rear clamping surface offset from each other in the radial direction. The invention further relates to a rotor for a rotary impact crusher having improved operating characteristics.

Description

Tool insert for a rotor of a rotary impact crusher

The invention relates to a tool insert for a rotor of a Rotationspratlbre- chers with a mallet, which has a head with a working part and a fastening ^¬ supply foot, wherein the mounting foot has a pointing in the feed direction front clamping surface and an opposite directed to the rear rear clamping surface.

Such a rotor is known from DE 38 07 176 A1. The rotor to be ^¬ nem outer periphery with four mutually offset by 90 ° are arranged tool holders is provided. Tool inserts are interchangeably mounted in these tool holders. The tool inserts comprise flails and clamping elements. For assembly, the tool inserts are ^¬ represents in the tool holders inserted therein, and clamped by means of the clamping elements. The flails are provided for this purpose in the region of their mounting feet with recesses, in these recesses engage the clamping elements with nose-shaped Keüvorsprüngen. During operation, considerable forces sometimes act on the flails. These are strongly stressed in the area of their tool feet to bending. In case of excessive stress, for example, when reinforcing steel parts or the like are contained in the rock material to be crushed, the stresses may become so high that a seal fracture occurs.

The object of the invention is to improve the reliability of a rotary pruning crusher.

This object is achieved in that in the region of the rear clamping surface, a projection projects rearwardly beyond the rear clamping surface, wherein the approach between two mutually radially offset clamping surface parts of the rear clamping surface is arranged.

With the above approach, the cross-sectional area and thus the äqüatoriaie resistance moment against bending is increased. This allows even exceptionally strong load peaks to be safely removed.

The fact that the approach between the two clamping surface parts of the rear clamping surface is arranged, it is functionally optimized positioned in a foot area, which is exposed to particularly high bending stresses.

According to a preferred embodiment of the invention it can be provided that the approach is arranged opposite to the feed direction behind the front clamping surface. Then, the flail between two functional surfaces of the rotor can be clamped so that the "moment pole" by which the flail is claimed, can be moved to the area of the approach or in the vicinity. An easily manufactured Schlegelgestaltung results when it is provided that the front and the rear clamping surface are parallel to each other.

In order to be able to achieve a centered alignment of the bracket, it can be provided that the attachment is wedge-shaped.

According to a conceivable variant of the invention, provision may be made for the head to form a discharge surface in the region of its front side pointing in the feed direction, which is provided with a tooth-shaped contouring and / or the head has an open space with a tooth-shaped contouring opposite to the feed direction behind the working part. The tooth-shaped contours form inclined Praii- areas at which the impact force of impacting rock elements is decomposed into force components. As a result, the wear of the Schlegel is optimized.

Particularly preferably, it is provided that the contouring of the discharge surface and / or the free surface pass into tooth-like surface parts of the working part in order to achieve further wear optimization. In addition, a more aggressive cutting geometry with improved comminuting effect is achieved via this geometry of the working parts.

A possible inventionsvanante is such that the head has a projection which protrudes opposite to the feed direction over the clamping surface. In this way, the clamping surface is covered with the projection, so that penetration of crushed material is impeded in the attachment point between the flail and the tool holder. Then the flail can be easily changed from excessive pollution easily. In addition, the projection protects the interface between the rotor and flail from the abrasive attack of vorbeiflie sequential rock material. A particularly preferred variant of the invention is such that a clamping part is supported on the front clamping surface, and that the clamping part has on its opposite front face of the clamping surface two wedge surfaces at an angle to each other. About the two wedge surfaces a clearly guided adjusting movement can be introduced into the clamping part with high clamping forces. It can be provided in particular that a clamping element is used which has two wedges, wherein the wedges with an adjusting device are mutually adjustable, and that in each case a wedge rests on a Keilfiäche.

The object of the invention is also achieved with a rotor for a rotary impact crusher with one or more tool carriers, which are provided with tool holders for receiving tool inserts, the tool carriers having surface portions, characterized in that the surface portions are equipped at least in regions with wear protection elements, which are arranged at a distance from one another and which project beyond the surface sections or are at least partially inserted into the surface section (s). The wear protection elements protect the surface sections from the abrasive wear attack of the crushing material. In the spaces between the wear protection elements fine rock material can collect on the surface sections and forms there a "natural" wear protection.

A conceivable design variant is such that the tool carriers are designed as disc-shaped elements which have the circumferentially extending surface portions between the tool holders, and / or that the tool holders are associated with cross member having the / the surface portions. The invention will be explained in more detail below with reference to an embodiment shown in the drawings. Show it:

Figure 1 is a perspective view of a rotor of a rotary impact crusher; Figure 2 shows the rotor according to Figure 1 in side view;

FIG. 3 is a perspective view of a component group taken from the rotor according to FIG. 1;

FIG. 4 shows the illustration according to FIG. 3 in vertical section;

Figure 5 shows a flail of the assembly according to Figures 3 and 4 in a perspective view from below; and

6 shows the mallet according to FIG. 5 in a perspective rear view.

FIG. 1 shows the rotor of a rotary impact crusher. This has a plurality of disc-shaped tool carrier 10 made of steel material, which are arranged spaced apart parallel to each other. Each tool carrier 10 has on its outer circumference incisions, the tool holders 1 1 form. The two outer tool carrier 10 are equipped with flange 12 and the intermediate tool carrier 10 with openings. Through the flange 12 and the apertures, a drive shaft of the rotary impact crusher pushed through and these are rotatably coupled to the flange 12. The tool carrier 10 have between the tool holders 11 surface portions 13 which are equipped with wear protection elements 14. These wear protection elements 14 are arranged spaced from each other and stand over the Surface sections 13 before. The anti-protection elements 14 have a steel base body with which they are welded onto the surface portions 13. The steel base body wear the surface portions 13 turned away hard material elements, preferably hard metal parts.

For connecting the individual tool carrier 10, cross members 20, 70 and a support strip 60 are used. These components are barrenartig and welded to the tool carriers 10. This results in a stable assembly.

Figure 2 shows the assignment of the cross member 20, 70 and the support bar 60 closer. With reference to Figures 3 and 4, these components are explained in more detail below.

The cross member 20 has a front surface 21 which merges at right angles into a bottom 25 and an upper side 22. At the top 22 and the bottom 25 close at obtuse angles wedge surfaces 23, 24 at. The cross member 20 is welded with its front surface 21 and the bottom 25 with the tool carriers 10.

The support strip 60 is arranged opposite to the feed direction V behind the cross member 20. It has a bottom-side mounting surface 62, to which a fastening surface 61 connects at the rear. With these Befestigungsfiächen 61, 62, the support bar 60 is placed on corresponding surfaces of the tool carrier 10 and welded here with this. The front side, the support bar 60 has a contact portion 63, in which a groove-shaped receptacle 64 is recessed. On the upper side, the support strip 60 has a cover surface 66.

The cross member 70 has a lower and a rear mounting surface 72, 73, which are also placed on corresponding mating surfaces of the tool carrier 10 and welded with these here. Front side, a recess with a support surface 71 is incorporated in the cross member 70.

As FIGS. 3 and 4 further show, a brace 50 can be connected to the support bar 60. The mallet 50 has a head 51 to which a mounting foot 52 is integrally formed. The head 51 is equipped with a receptacle 57, in which a working part 56, for example, a hard metal element or the like hard material element, is used. This working part 56 may be suitably connected to the head 51, for example soldered, welded, glued or the like.

The design of the bracket 50 can be closer to Figures 5 and 6 refer. As these illustrations show, the flail 50 has in the region of its fastening foot 52 a rear side, opposite to the feed direction V, clamping surface 59, which is subdivided into two clamping surface parts 59.1, 59.2. In this case, the clamping surface parts 59.1, 59.2 are arranged spaced from one another in the radial direction. Between the two clamping surface parts 59.1, 59.2 is a projection 53 back before. In this case, the approach 53 is narrower than the total width of the crucible 50, so that paragraphs 53.1 result. On the front side, the flail 50 forms a clamping surface 54 which points in the feed direction V. This flute is therefore oriented opposite to the clamping surface 59. FIG. 5 shows that the head 51 has a working surface at the front and radially above the clamping surface 54, which is provided with a contouring. In this case, the contouring forms tooth-shaped elevations, which each form a tooth with two mutually angled tooth flanks. Likewise, the working parts 56 front on a corresponding contouring, wherein the contouring of the working parts 56 merges into the working surface 55.

FIG. 6 shows that the flail 50 likewise has a contouring in the region of the rear side of the head 51. Again, the contouring of dental tiger formed elevations, each formed by two mutually angled Zahnfianken. The contouring is formed by two contouring sections that are at an angle to one another, wherein the first contouring section adjoins the working parts 56 directly. The working parts 56 have radially outwardly a roof-shaped geometry, which merges flush in the first contouring section. The second contouring section closes at an angle to the first contouring section, as can be clearly seen in FIG. Both contouring sections form an open space 51 .1.

The flail 50 can be inserted into the tool holder 11 in such a way that the projection 53 engages in the receptacle 64 of the support strip 60, as shown in FIG. 4. This insertion movement is limited by means of the clamping surface parts 59.1, 59.2, which abut against the abutment portion 63 of the support bar 60. When inserted, a projection 58 of the head 51 of the bracket 50 projects beyond the interface formed between the clamping surface 59 and the abutment portion 63 and prevents penetration here of rock material. ^'

For fixing the bracket 50, a clamping element 30 is used. This clamping element 30 has two wedges 31, each having two mutually opposed clamping surfaces 32. The two wedges 31 are provided with holes through which a set as a screw actuator 33 is inserted. To keep the two wedges 31 against each other captive, a nut 34 is screwed onto the free end of the screw. For fixing the bracket 50, a clamping member 40 is further used, which has two mutually angled wedge surfaces 41, 42. On the back, the clamping part 40 is limited by means of a support surface 44. Finally, the clamping part 40 also has a bottom surface 43 which is placed on the support surface 71 of the cross member 70. As can be seen in FIG. 4, the two wedges 31 lie with their clamping surfaces 32 flat on the wedge surfaces 23, 24 of the cross member 20 and the Keiiflächen 41, 42 of the clamping member 40. If now the adjusting device 33 is tensioned and thereby screwed into the nut 34, the wedges 31 move toward each other and slip on the wedge surfaces 23, 24, 41, 42 from. In this case, the clamping member 40 in Figure 4 to the right, that is opposite to the feed direction V, moved. The clamping member 40 presses against the clamping surface 54 of the bracket 50. As a result, the flail 50 is pressed with its clamping surface parts 59.1, 59.2 against the contact portion 63 of the support bar 60. In this way, a stable tension of the bracket 50 is possible. During the clamping movement, the clamping part 40 slides with its bottom surface 43 guided over the support surface 71. Due to the symmetrical configuration of the wedges 31 and the symmetrical arrangement of the wedge surfaces 23, 24, 41, 42 a linear movement opposite to the feed direction V is introduced into the clamping part 40 , In this way, a reproducible tension of the bracket 50 is possible.

As can be seen from FIG. 1, one clamping part 40 and one clamping element 30 are used per flail 50. In this way, individually each flail 50 can be replaced individually, resulting in a significant reduction in work. Furthermore, in the case of a tool damage only the respective affected flail 50 must be replaced.

Figures 1 and 2 show that the respective outer flail 50 are additionally secured with a plate-shaped securing element 67. This securing element 67 is screwed to the support strip 60 with screws 68 (see screw receptacles 69 according to FIG. 3).

FIG. 3 illustrates that the cross member 70 has cheeks 74 which position the clamping parts 40 in the correct direction in the axial direction of the rotor.

Claims

claims

A tool insert for a rotor of a rotary crusher having a hammer (50) having a head (51) with a working portion (56) and a mounting foot (52), the mounting base (52) facing in the direction of advance (V) the front clamping surface (54) and an opposite back to the rear rear clamping surface (59),

characterized,

that in the region of the rear clamping surface (59) a projection (53) projects rearwardly beyond the rear chip surface (65), wherein the projection (53) is arranged between two mutually offset in Radiairrichtung clamping surface parts (59.1, 59.2) of the rear clamping surface (59) ,

2. Tool insert according to claim 1,

characterized,

in that the projection (53) is arranged opposite to the feed direction (V) behind the front clamping surface (54).

3. Tool insert according to claim 1 or 2,

characterized,

in that the front and rear clamping surfaces (54, 59) are parallel to each other.

4. Tool insert according to one of claims 1 to 3,

characterized,

the projection (53) is wedge-shaped.

5. Tool insert according to one of claims 1 to 4,

characterized,

the head (51) forms, in the region of its front side pointing in the direction of advance (V), a discharge surface (55) which is provided with a tooth-shaped contouring.

6. Tool insert according to one of claims 1 to 5,

characterized,

the head (51), opposite to the feed direction (V) behind the working part (56), has an open surface (51.1) with a tooth-shaped contouring.

7. Tool insert according to one of claims 5 or 6,

characterized

that the contouring of the Abieitfläche (55) and / or the free surface (51.1) in tooth-like surface parts of the working part (56) pass.

8. Tool insert according to one of claims 1 to 7,

characterized,

in that the head (51) has a projection (58) which protrudes beyond the clamping surface (59) opposite to the direction of advance (V).

9. Tool insert according to one of claims 1 to 8,

characterized,

in that a clamping part (40) is supported on the front clamping surface (54), and in that the clamping part (40) has, on its front side opposite to the clamping surface (54), two angularly inclined wedge surfaces (41, 42).

10. Tool insert according to claim 9,

characterized,

in that a clamping element (30) is used which has two wedges (31), wherein the wedges (31) are adjustable relative to one another with an adjusting device (33), and in that a respective wedge (31) bears against a wedge surface (41, 42) ,

1 1. Rotor for a rotary pruner with one or more tool carriers (10) which are provided with tool receptacles (11) for receiving tool inserts, the tool carriers (10) having surface sections (12),

characterized,

the surface sections (12) are equipped, at least in regions, with wear protection elements (14) which are arranged at a distance from one another and project beyond the surface sections (13) or at least partially into the surface section (s) (13).

12. Rotor according to claim 1 1,

characterized.

That the tool carrier (10) are formed as disk-shaped elements which have between the tool holders (1 1) extending in the circumferential direction surface portions (13).

13. Rotor according to claim 11 or 12,

characterized,

that the tool holders (1 1) are associated with cross members (20) having the surface portions (13).