Crushing blade for shear crusher and method for repairing the same

Abstract

To provide a crushing blade for a shear crusher that is configured so that an outer peripheral surface and a side surface thereof can be effectively suppressed from being abraded, and fragments of an object to be ground entering a gap can be surely picked up and then quickly ejected to a lower side of a rotary shaft, and a method for repairing (regenerating) the same.SOLUTION: In a crushing blade 1 for a shear crusher, in which hook-shape blade tip parts 2 are formed at an outer periphery part, an insertion hole 3 of a rotary shaft is formed at a central part, and a side surface 4 is subjected to surface hardening, a plurality of spot build-up hardening parts 6A formed on an outer peripheral surface 5 by build-up welding hardened materials into a semi-spherical shape, in a conical shape or in a truncated cone shape are arranged with an interval in a circumferential direction. A C-shape build-up hardened part and / or a build-up hardened part in a crescent shape formed by build-up welding hardened materials is arranged on the side surface 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a crushing blade used in a shear crusher used for shearing and crushing waste materials, and a method for repairing (regenerating) the same. [Background technology]

[0002] Conventionally, as a means for cutting and crushing waste tires, waste plastics, etc., a shearing crusher incorporating a crushing unit 10 as shown in Fig. 3 has been used. This crushing unit 10 is composed of a number of disk-shaped crushing blades 13 (13A, 13B), a spacer 14, and two parallel rotating shafts 15A, 15B having a hexagonal cross section, and is configured so that the workpiece is pinched above the rotating shafts 15A, 15B and wrapped in the area between the rotating shafts 15A, 15B, and sheared and crushed by rotating the rotating shafts 15A, 15B (and the crushing blades 13, etc.) in opposite directions.

[0003] 3, a hook-shaped blade tip 32 is formed on the outer periphery of the crushing blade 13, and a hexagonal insertion hole 33 for inserting the rotating shafts 15A and 15B is formed in the center. The spacer 14 has a smaller diameter than the crushing blade 13 and a thickness dimension set to be slightly larger than the crushing blade 13, and has an insertion hole similar to that of the crushing blade 13 formed in the center.

[0004] In this crushing unit 10, the crushing blades 13 and the spacers 14 are alternately arranged around each of the rotating shafts 15A and 15B, and the crushing blades 13 are held on the rotating shafts 15A and 15B at intervals equal to the thickness of the spacer 14. The crushing blade 13A on the rotating shaft 15A side and the crushing blade 13B on the rotating shaft 15B side are arranged in opposite directions (more specifically, the blade tips face each other on the upper side of the rotating shafts 15A and 15B).

[0005] The crushing blades 13A on the side of the rotating shaft 15A and the crushing blades 13B on the side of the rotating shaft 15B are arranged in a stagger pattern, and the outer peripheral parts are configured to mesh with each other with a slight gap. That is, the space between the outer peripheral parts (including the blade tip part 32) of two adjacent crushing blades 13A on one rotating shaft 15A (the space outside the spacer 14) allows the outer peripheral part (including the blade tip part 32) of the crushing blade 13B on the other rotating shaft 15B to enter. Similarly, the outer peripheral part of the crushing blade 13A on the rotating shaft 15A enters the space between the outer peripheral parts of two adjacent crushing blades 13B on the rotating shaft 15B.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0007] The crushing blade 13 used in the crushing unit 10 as shown in FIG. 3 is subjected to hard facing (a process of welding or spraying a hard facing material (such as an alloy having a higher hardness than the base material) on the base material surface) on the side surface 34 (a surface perpendicular to the central axis of the rotating shaft 15 inserted through the insertion hole 33) for the purpose of improving wear resistance.

[0008] However, in a conventional general crushing blade 13, since the hard facing is applied only to the side surface 34, when wear of the outer peripheral surface 35 (including the blade tip part 32) progresses due to continuous use of the crushing blade 13, fine cracks occur in the hard facing material on the side surface 34, and the phenomenon of easy peeling frequently occurs.

[0009] In order to avoid such problems, when the wear of the outer peripheral surface 35 of the crushing blade 13 has progressed to a considerable extent (or before the wear progresses), as shown in FIG. 4, a hardfacing material is built up in a strip shape on the outer peripheral surface 35 with a dimension width smaller than the thickness of the crushing blade 13 to form a build-up hardfacing portion 36.

[0010] However, in this case, a phenomenon is likely to occur in which fragments of the workpiece are caught in the gap between the crushing blade 13 and the spacer 14 facing it. When the crushing blade 13 and the spacer 14 are rotated with the fragments caught, the fragments will make sliding contact with the outer peripheral surfaces of the crushing blade 13 and the spacer 14, resulting in a problem that the wear of the crushing blade 13 and the like progresses.

[0011] Also, instead of building up the hardfacing material with a dimension width smaller than the thickness of the crushing blade 13 as shown in FIG. 4, if the hardfacing material is built up with the same dimension width as the thickness of the crushing blade 13, that is, covering the entire outer peripheral surface 35 (not shown), there is a problem that cracks will occur in the hardfacing material pre-constructed on the side surface 34 and a peeling phenomenon will occur.

[0012] The present invention aims to solve such problems in the prior art, and by suppressing wear on the outer peripheral surface and side surface, it is possible to effectively avoid cracks and peeling of the hardfacing material on the side surface, and also to reliably capture fragments of the workpiece that have entered the gap and quickly discharge them to the lower side of the rotating shaft. An object of the present invention is to provide a crushing blade for a shear crusher and a method for repairing (reproducing) the same.

Means for Solving the Problems

[0013] The crushing blade according to the present invention is a crushing blade for a shear crusher in which a hook-shaped blade tip portion is formed on the outer peripheral portion, an insertion hole for a rotating shaft is formed in the central portion, and hardfacing is applied to the side surface. A plurality of build-up hardfacing portions formed by build-up welding of a hardfacing material are arranged at intervals in the circumferential direction on the outer peripheral surface and / or the side surface.

[0014] Furthermore, it is preferable to arrange a plurality of spot build-up hardening portions formed by build-up welding a hard-facing material into a hemispherical shape, a conical shape, or a frustum of a cone shape on the outer peripheral surface, and it is preferable to arrange a C-shaped build-up hardening portion and / or a crescent-shaped build-up hardening portion formed by build-up welding a hard-facing material on the side surface.

[0015] The diameter of the spot build-up hardening portion is preferably set to 1 / 2 to 2 / 3 of the thickness dimension of the crushing blade, and the arrangement interval is preferably set to 5 to 30 mm. The C-shaped build-up hardening portion and the crescent-shaped build-up hardening portion are preferably formed such that the center of curvature curves and extends in a direction toward the front side in the rotational direction, and the end portion on the outer side in the radial direction is located in front of the end portion on the inner side in the radial direction in the rotational direction.

[0016] The method for repairing a crushing blade according to the present invention is characterized in that when wear progresses on the outer peripheral surface or the side surface of a crushing blade for a shear crusher having a hook-shaped blade tip portion formed on the outer peripheral portion, a rotation shaft insertion hole formed in the central portion, and hard-facing applied to the side surface, a plurality of build-up hardening portions are formed at intervals in the circumferential direction by build-up welding a hard-facing material on the worn surface.

[0017] Furthermore, on the worn outer peripheral surface, it is preferable to form a plurality of spot build-up hardening portions by build-up welding a hard-facing material into a hemispherical shape, a conical shape, or a frustum of a cone shape. Also, on the worn side surface, it is preferable to form a C-shaped build-up hardening portion and / or a crescent-shaped build-up hardening portion by build-up welding a hard-facing material.

Advantages of the Invention

[0018] The crushing blade according to the present invention can effectively suppress wear of the outer peripheral surface by a large number of spot build-up hardening portions formed on the outer peripheral surface. As a result, it is possible to suitably avoid the occurrence of fine cracks and peeling of the hardening material on the side surface. Further, when a C-shaped or crescent-shaped build-up hardening portion is formed on the side surface, the wear resistance of the side surface can be improved in the same manner as when the entire surface is covered with a hardening material. Furthermore, the spot build-up hardening portion on the outer peripheral surface and / or the C-shaped or crescent-shaped build-up hardening portion on the side surface can surely capture the chips of the workpiece that have entered the gap between the crushing blade and the spacer, and quickly discharge them to the lower side of the rotating shaft. As a result, wear of the crushing blade caused by sliding contact between the chips and the crushing blade can be suitably suppressed.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0020] The present invention can be implemented as a "crushing blade" for a shearing crusher, and can also be implemented as a "method for repairing a crushing blade". Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0021] FIG. 1 is a side view and a cross-sectional view of the crushing blade 1 according to the first embodiment of the present invention. As shown, this crushing blade 1, similar to the conventional crushing blade 13 shown in FIGS. 3 and 4, has a hook-shaped blade tip 2 formed on the outer peripheral portion, and a hexagonal insertion hole 3 for inserting a rotating shaft is formed in the central portion. Further, the side surface 4 is provided with hard facing (a hard facing material 7 having a higher hardness than the base material is welded) for the purpose of improving wear resistance.

[0022] And in this crushing blade 1, a build-up hard facing portion 6A (spot build-up hard facing portion) formed by hemispherical build-up welding of the hard facing material is arranged on the outer peripheral surface 35. Note that the build-up hard facing portion 36 formed on the outer peripheral surface 35 of the conventional crushing blade 13 shown in FIG. 4 is formed in a continuous band shape over substantially the entire circumference of the outer peripheral surface 35 (excluding the tip portion and the stepped portion of the blade tip 32), but the build-up hard facing portions 6A of the present embodiment are each formed in a hemispherical shape and are arranged in a number with an interval in the circumferential direction (rotating direction).

[0023] Each build-up hard facing portion 6A has a diameter of 1 / 2 to 2 / 3 of the thickness dimension of the crushing blade 1, and is arranged at the center in the width direction of the outer peripheral surface 5 at an interval of 5 to 30 mm over the entire circumference of the outer peripheral surface 5. The height (the amount of protrusion from the outer peripheral surface 5) of each build-up hard facing portion 6A is such that it does not contact the opposing spacer.

[0024] The crushing blade 1 according to the present embodiment can effectively suppress the wear of the outer peripheral surface 5 by the large number of build-up hard facing portions 6A formed on the outer peripheral surface 5. As described above, when the wear of the outer peripheral surface 5 progresses, fine cracks often occur in the hard facing material 7 on the side surface 4 and lead to peeling. However, since the crushing blade 1 of the present embodiment can suppress the wear of the outer peripheral surface 5, it can preferably avoid the occurrence of fine cracks and peeling of the hard facing material 7 on the side surface 4.

[0025] Further, as shown in FIG. 4, when the build-up hardening portion 36 is formed in a continuous band shape over substantially the entire circumference of the outer peripheral surface 35, there is a problem that fragments of the workpiece or the like are caught in the gap between the crushing blade and the spacer and stagnate, and due to the sliding contact between the caught fragment and the crushing blade, the wear of the crushing blade progresses. However, in the crushing blade 1 of the present embodiment, since a large number of hemispherical build-up hardening portions 6A are arranged at intervals in the circumferential direction of the outer peripheral surface 5, fragments that have entered the gap between the crushing blade 1 and the spacer can be reliably captured and quickly discharged downward of the rotation axis. As a result, the wear of the crushing blade due to the sliding contact between the fragment and the crushing blade can be preferably suppressed.

[0026] Furthermore, the hemispherical build-up hardening portion 6A will gradually wear due to long-term cumulative use, and the protruding amount will gradually decrease. However, compared with the flat hardening covering the entire outer peripheral surface 5, the degree of wear can be easily grasped visually. Therefore, at an appropriate timing (when a certain degree of wear has progressed), the crushing blade 1 is removed from the rotation axis, and the build-up material is welded in a hemispherical shape again, so that the build-up hardening portion 6A can be regenerated to the state before wear, and a predetermined quality can be maintained over a long period of time.

[0027] In addition, in the present embodiment, the build-up hardening portion 6A is formed in a hemispherical shape, but it can also be formed in a conical shape or a frustum of a cone shape. Further, the build-up hardening portion 6A of the crushing blade 1 according to the present invention is not limited to a perfect circle in the planar contour shape, and also includes an elliptical shape. Further, the build-up hardening portion 6A as shown in FIG. 1 can be formed at the time of manufacturing the crushing blade 1, or can also be formed when the wear of the outer peripheral surface 5 of the crushing blade 1 progresses (repair method of the crushing blade).

[0028] FIG. 2 is a side view of the crushing blade 1 according to the second embodiment of the present invention. As shown in the figure, in this crushing blade 1, a C-shaped build-up hardening portion 6B and a crescent-shaped build-up hardening portion 6C formed by build-up welding of a hardening material are arranged at intervals in the circumferential direction at the radially outer portion 4a of the side surface 4 (a portion radially outside the position R of the outer peripheral portion of the spacer adjacent in the axial direction).

[0029] These build-up hardening portions 6B and 6C have a width dimension of 2 to 10 mm, and the center of curvature is curved and extends in a C shape or a crescent shape in a direction that is the front side in the rotation direction of the crushing blade 1 (clockwise in FIG. 2), and the radially outer end 61 is formed so as to be located in front of the radially inner end 62 in the rotation direction of the crushing blade 1. The height (the amount of protrusion from the side surface 4) of the build-up hardening portions 6B and 6C is such that they do not contact the side surfaces of the opposing crushing blades.

[0030] In addition, the C-shaped build-up hardening portion 6B is disposed at a radius-expanding portion (a portion protruding more radially outward than other portions) near the blade tip portion 2, and the ends 61 and 62 are non-acute angles and have a width dimension similar to that of other portions (such as the intermediate portion 63). On the other hand, the crescent-shaped build-up hardening portion 6C is disposed at a position with a predetermined interval on the rear side (the rear side in the rotation direction of the crushing blade 1) of the build-up hardening portion 6B, and both ends are formed at acute angles.

[0031] In the crushing blade 1 of the present embodiment, since a plurality of C-shaped build-up hardening portions 6B and crescent-shaped build-up hardening portions 6C are arranged at intervals in the circumferential direction on the side surface 4 (radially outer portion 4a), fragments that have entered the region between this crushing blade 1 and another crushing blade adjacent in the axial direction with a spacer interposed therebetween can be surely captured and quickly discharged to the lower side of the rotation axis. As a result, wear of the crushing blade caused by sliding contact between the fragment and the crushing blade can be preferably suppressed.

[0032] The C-shaped build-up hardening portion 6B and the crescent-shaped build-up hardening portion 6C as shown in Fig. 2 are effectively formed when the wear of the hardening material 7 (see Fig. 1(2)) applied to the side surface 4 of the crushing blade 1 progresses (repair method of the crushing blade). When the wear of the hardening material 7 on the side surface 4 progresses, compared with the operation process of re-hardening the entire side surface 4 (welding the hardening material 7), the operation process of convex build-up welding the build-up hardening portions 6B and 6C with an area smaller than the entire side surface 4 to the surface of the worn hardening material 7 (or the surface of the base material) is easier, requires less time, and is less costly. And by forming the build-up hardening portions 6B and 6C on the side surface 4, the wear resistance of the side surface 4 can be improved in the same way as when the entire surface is covered with the hardening material 7.

[0033] In addition, Fig. 2 shows a state in which the C-shaped build-up hardening portion 6B and the crescent-shaped build-up hardening portion 6C are formed on one side surface 4 of the crushing blade 1, but on the opposite side surface, the C-shaped build-up hardening portion 6B and the like are also formed under the same conditions. Further, in Fig. 2, the crushing blade 1 on which the hemispherical build-up hardening portion 6A, the C-shaped build-up hardening portion 6B, and the crescent-shaped build-up hardening portion 6C are formed is shown, but among these, it can also be configured as a crushing blade 1 on which only one type or two types of them are formed.

Explanation of Signs

[0034] 1: Crushing blade, 2: Cutting edge portion, 3: Insertion hole, 4: Side surface, 4a: Radially outer portion, 5: Outer peripheral surface, 6A, 6B, 6C: Build-up hardening portion, 7: Hardening material, 10: Crushing unit, 13, 13A, 13B: Crushing blade, 14: Spacer, 15, 15A, 15B: Rotation shaft, 32: Cutting edge portion, 33: Insertion hole, 34: Side surface, 35: Outer peripheral surface, 36: Meat-filled hard-mounted part, 61, 62: End part, 63: Middle part

Claims

1. In a crushing blade for a shearing crusher, which has a hook-shaped blade tip formed on its outer peripheral part, a rotation shaft insertion hole formed in its central part, and hard facing applied to its side surface, the crushing blade is characterized in that a plurality of build-up hard facing parts, formed by build-up welding of a hard facing material on the outer peripheral surface and / or the side surface, are arranged at intervals in the circumferential direction.

2. The crushing blade according to claim 1, wherein a plurality of spot build-up hard facing parts, formed by build-up welding of a hard facing material on the outer peripheral surface in a hemispherical shape, a conical shape, or a frustum of a cone shape, are arranged.

3. The crushing blade according to claim 2, wherein the spot build-up hard facing parts are set such that the diameter is 1 / 2 to 2 / 3 of the thickness dimension of the crushing blade, and the arrangement interval is set to 5 to 30 mm.

4. The crushing blade according to claim 1, wherein a plurality of C-shaped build-up hard facing parts and / or crescent-shaped build-up hard facing parts, formed by build-up welding of a hard facing material on the side surface, are arranged.

5. The C-shaped build-up hard facing parts and the crescent-shaped build-up hard facing parts are formed such that the center of curvature curves and extends in a direction where the front side in the rotation direction is the front side, and the end part on the outer side in the radial direction is positioned in front of the end part on the inner side in the radial direction in the rotation direction.

6. When wear progresses on the outer peripheral surface or the side surface of a crushing blade for a shearing crusher, which has a hook-shaped blade tip formed on its outer peripheral part, a rotation shaft insertion hole formed in its central part, and hard facing applied to its side surface, a method for repairing a crushing blade is characterized in that a plurality of build-up hard facing parts are formed at intervals in the circumferential direction by build-up welding of a hard facing material on the worn surface.

7. The method for repairing a crushing blade according to claim 6, wherein a plurality of spot build-up hard facing parts are formed by build-up welding of a hard facing material in a hemispherical shape, a conical shape, or a frustum of a cone shape on the worn outer peripheral surface.

8. The method for repairing a crushing blade according to claim 6, wherein a plurality of C-shaped build-up hard facing parts and / or crescent-shaped build-up hard facing parts are formed by build-up welding of a hard facing material on the worn side surface.

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