JPH0833849A - Rotor of shock pulverizer - Google Patents

Abstract

PURPOSE: To enable to produce an impact bar of a hard alloy by combining a lock device provided at the rear side of the impact bar with a removable wedge supported on a projecting part at the front side of the impact bar, so that exchange and reversion of the impact bar is facilitated. CONSTITUTION: When a washer 36 is clamped, a gap between a wedge 42 and an impact bar 14 is tightened and the impact bar 14 is accurately positioned. The wedge 42 gives such a thrust force radially that the impact bar 14 is fixed to an inner edge of a fixed roll. In replacing or reversing the impact bar 14, after a lock device 24 is unlocked by pulling a screw out of the washer 36 tightening a wedge 34, each wedge 42 is unlocked from a projection part 40 by sliding it in axial direction and taken out in radial direction between two adjacent disks 10. Resultantly, the impact bar 14 can be pulled out and be removed easily from its accommodated place in the radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact crusher rotor.

[0002]

2. Description of the Related Art Rotor The rotor of an impact crusher to which the present invention is applied has a series of discs fixed to a rotary spindle and an impact bar or impact blade (i.e., an impact blade) accommodated in an accommodating portion open to the outer periphery of the disc. battoirs) and a device for holding the impact bar in the housing, the impact bar extending longitudinally,
It has a vertically symmetrical cross-sectional shape and projects radially from the disc.

Crushers of this kind are widely used, for example, for rock crushing. The substance to be crushed is supplied onto a rotor driven around a rotary spindle and crushed by colliding with an impact bar or crushed by being thrown onto a screen by the rotor. Due to the high impact forces exerted on the impact bar, the impact bar wears quickly and must be replaced quite often. In order to reduce the impact bar replacement frequency by half, it is known to use symmetrically shaped impact bars so that they can be used inside out when the attack surface is worn.

Patent document AT-B-351,906 describes a rotor with a symmetrical impact bar which can be turned over when one of the attack surfaces is worn. This symmetrical impact bar has two symmetrical grooves with a round cross section on the front side and the rear side, the rear side is fixed by a round rod, and the front side is fixed by a wedge. The wedge is wedged to the pointed nose forming the outer edge of the housing. This impact bar is not fixed to a rigid body but reciprocates around a rod and a wedge, and stops at a predetermined position by the action of centrifugal force. Since the impact bar is not rigidly fixed, it must be made of a fairly ductile material such as steel, manganese steel or the like. As a result, wear resistance is sacrificed. In this impact bar, the wedge can only be removed tangentially from the projection that secures it, so that it must be able to be pulled axially from the rotor when the impact bar is inverted or replaced. This is often an obstacle.

The impact bar of the rotor described in the patent document DE-A-21 47 920 can be removed in the radial direction. The impact bar is fixed by a removable wedge. However, since this impact bar is not symmetrical, it has the drawback that the impact bar cannot be inverted when the attack surface wears. Also, since the impact bar is not rigidly fixed, it cannot be made from a material with optimal wear resistance.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to easily replace and reverse the impact bar of a crusher rotor,
Moreover, it is to be able to make an impact bar with an extremely hard alloy.

[0007]

SUMMARY OF THE INVENTION A rotor provided by the present invention comprises a gradually tightening locking device provided on the rear side of the impact bar and an outer edge of a housing portion on the front side of the impact bar. It is characterized in that it has a locking and rigid body tightening device for an impact bar which is combined with an axially removable wedge supported by a protrusion.

[0008]

The impact bar can be removed from the projection by sliding the wedge axially when it is unlocked and by pulling it radially between two adjacent disks. Thus, by removing all the wedges in the same row, the impact bar can be radially removed from the housing. This allows removal in this direction, substantially reducing maintenance time.

Two constricted portions having symmetrical contour shapes are formed on the front and rear surfaces of the middle portion of each impact bar, and the constricted portions on the rear surface are pressed by the wedge,
The constriction on the front face is pressed radially and tangentially by a locking device for rigidly fixing the impact bar in the housing. This rigid fixation allows for improved wear resistance using extremely stiff impact bars, for example chrome cast iron impact bars with a hardness of 63 Rc or higher. Other features and advantages of the present invention will become apparent from the following description of embodiments with reference to the accompanying drawings. However, these examples do not limit the present invention at all.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The rotor shown in the accompanying drawings is a series of discs 10.
It is composed of Each disk is fixed to a horizontal central spindle (not shown). The disk 10 is rotated by this central spindle during operation. A plurality of recesses or accommodating portions 12 (four in the illustrated embodiment) are formed on the outer peripheral edge of each disk 10. Each of the accommodating portions 12 is aligned with each other in the vertical direction, and an impact bar 14 that collides with the crushed object when the rotor rotates is accommodated in each row of the accommodating portions 12.

As can be seen from the figure, the cross section of each impact bar 14 in the radial direction of the rotor has a symmetrical shape, and has two symmetrical attack surfaces 16 and 18, and the attack surface 16 of the impact bar 14 is worn. At that time, the impact bar 14 can be inverted and the attack surface 18 can be used to continue the crushing operation. In addition, the impact bar 14 is accommodated in the middle portion of each impact bar 14 in the housing portion 12.
Two constricted portions 20 and 22 having symmetrical cross-sectional contour shapes for fixing and wedge-locking are formed therein.

The impact bar 14 is fixed by a locking device 24 on the rear side of the impact bar 14 when viewed in the rotational direction. This locking device 24 is a fixed rail 26 welded to each disc 10.
have. This fixed rail 26 extends through all the accommodating parts 12 aligned. This fixed rail 26 has 1
It has a group of cylindrical bores 28 (see FIG. 3). Each bore
28 is open to the outside, and a tap hole 30 extends to the inside of the fixed rail 28. On the impact bar 14 side of the fixed rail 26, the mounting step 32 is provided with a mounting step 32 extending over the entire length of the fixed rail 26. The mounting step 32 extends to the bore 28 and releases the impact bar 14 side of the bore 28 (the impact bar 14 side of the bore 28 is cut away).

As shown in FIGS. 1 and 2, this mounting step portion
32 serves as a housing for the wedge 34, and a thick cylindrical washer 36 (FIGS. 1 and 4) is inserted into each bore 28. Each washer 36 has a beveled notch 38 (Fig. 4) that makes an angle of about 15 ° with the generatrix, insert the washer 36 into the bore 28 and screw the washer 36 into the bore 28 using screws not shown. When tightened, the sloped notch 38 of the washer 36 engages the wedge 34 and presses the wedge 34 toward the impact bar 14, which is secured to the neck 22 by the wedge action.

On the front side of the impact bar 14 of each accommodation portion 12, a protrusion 40 protruding toward the lock device 24 is formed. Each protrusion 40 is covered with a removable wedge 42 having a generally "C-shaped" cross section. The inner surface of this C-shaped wedge 42 has the same contour shape as the shape of the wedge 42, and its outer surface has the same contour shape as the front waist 20 of the impact bar 14. Therefore, each impact bar 14 is rigidly fixed (anchored) in the radial direction and the tangential direction between the wedge 42 and the locking device 24.

In practice, when the washer 36 is tightened, the wedge 34
The front beveled notch 38 engages with the upper edge of the neck 22 of the impact bar 14 and the neck 20 has a contour opposite to that of the wedge 42 so that a thrust force is applied tangentially to the wedge 42. The impact bar 14 is tightened and the impact bar 14 is accurately positioned. Also, when the washer 36 is tightened, the wedge 42 exerts a radial thrust force on the impact bar 14. Thereby, the impact bar 14 is fixed to the inner edge of the fixed rail 26 via the inner edge of the constriction 22. In this way, the impact bar 14 is accurately positioned and rigidly fixed between the locking device 24 and the wedge 42.

When the impact bar 14 is to be replaced or inverted, the washer 36 tightening the wedge 34 is unscrewed to release the lock device 24, and then each wedge 42 is slid in the axial direction to be removed from the protrusion 40. Radial disengagement between two adjacent disks 10. When all the wedges 42 in the same row are removed in this way, a sufficiently wide space is created between the tip of the protrusion 40 and the locking device 24, so that the impact bar 14 can be pulled out, so that the impact bar 14 can be received. Can be easily removed in the radial direction. When the impact bar 14 is reattached, the same operation as described above may be performed in the reverse order.

[Brief description of drawings]

FIG. 1 is a perspective view of an impact crusher rotor of the present invention.

FIG. 2 is a cross-sectional view of the same rotor.

FIG. 3 is a perspective view of the rotor with the impact bar removed.

FIG. 4 is a perspective view of an impact bar tightening washer.

[Explanation of symbols]

10 Disk 12 Housing 14 Impact bar 20, 22 Constriction 24 Locking device 26 Fixed rail 28 Bore 32 Mounting step 34 Wedge 36 Washer 38 Inclined notch 42 Wedge

Claims (5)

[Claims] 1. A series of discs (10) fixed to a rotating spindle, and a storage part (12) opened at an outer peripheral portion of the discs (10), the radial direction from the discs (10). In a rotor of an impact crusher, which comprises a plurality of symmetrically shaped impact bars (14) protruding in the vertical direction and extending in the longitudinal direction, and a device for holding each impact bar (14) in the accommodating portion (12). Supported by a locking device provided on the rear side of the impact bar (14) that can be gradually tightened, and a protrusion (40) protruding from the outer edge of the accommodation section (12) on the front side of the impact bar (14). A rotor having a locking and rigid body tightening device (24) for an impact bar (14) in combination with an axially removable wedge (42). 2. A projection (40) which slides the wedge (42) axially when the impact bar (14) is unlocked and which is pulled out radially between two adjacent disks (10). The rotor according to claim 1, which is removable from the rotor. 3. Two constrictions with symmetrical contours on the front and rear faces of the middle of each impact bar (14).
The rotor according to claim 1 or 2, which has (20, 22). 4. Wedge (42) as a whole having a C-shaped cross-section, the outer contour shape of which is the same as the shape of the corresponding neck (20) of the impact bar (14). The rotor according to claim 1. 5. A locking and rigid body tightening device (24) has a fixed rail (26) extending in the longitudinal direction and welded to each disk (10) at the rear part of the receiving part (12). (26) is a cylindrical bore (28) with a tap screw and a wedge for tightening.
A vertically extending mounting step (3
2) and has an opening on the impact bar (14) side of the bore (28), a cylindrical washer (36) is inserted into the bore (28), and this washer (36) is an inclined cut. Part (38) with washer (36)
The wedge (34) is adapted to move toward the constricted part (22) on the rear side of the impact bar (14) through the inclined cutout part (38) as it is tightened in the (28). 4. The rotor according to claim 4.