JP4303294B2 - Ring hammer for crusher - Google Patents

Description

  The present invention relates to a ring hammer for a crusher used in a crusher for crushing an object to be crushed such as waste.

As shown in FIG. 4, a general crusher includes an inlet 13 for a material to be crushed provided in the casing 12, a plurality of rotors 9 that rotate around a rotation shaft 14 (see arrows in the figure), A bearing 15 that supports the rotating shaft 14, a crusher ring hammer 1 provided at the tip of each rotor 9, and a receiving part (not shown) crushed by the crusher ring hammer 1. And a great bar 11 to be discharged (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-300223

  The crusher ring hammer 1 is rotatably supported by support shafts 10 provided at both ends of a rotor 9 through a hole 3 provided in the center thereof, and a head portion 4 is provided on the outer periphery thereof (see FIG. 5). The striking portions 6 are formed at both ends of the head portion 4 in the rotation direction, and the striking portions 6 of the head portion 4 that rotates together with the rotor 9 strikes the object to be crushed from the charging port 13. The material to be crushed is crushed by the shearing force generated by.

Moreover, the great bar 11 is a lattice-like member composed of iron grids with a predetermined interval, and among the crushed items crushed by the blow, the crushed material has a size that can pass through the lattice with the predetermined interval. Only passes through the lattice and is discharged to the receiving part. The larger crushed material that could not be slipped through is hit again by the head portion 4 to be further crushed and finally discharged to the receiving portion.
Several types of the great bar 11 having different lattice intervals are prepared in advance, and the great bar 11 is appropriately replaced so that the crushed material to be discharged has a desired size.

An example of the crusher ring hammer 1 will be described in detail with reference to FIG. The crusher ring hammer 1 has four head portions 4 which are thicker in the length direction of a hole 3 provided in the center of the base portion 2 than the base portion 2 on the outer peripheral portion of the base portion 2. Is provided. Thus, only the head part 4 is made thick because the thickness of the base part 2 that does not directly contribute to the crushing is made as thin as possible while ensuring the crushing ability of the head part 4 that directly contributes to crushing the object to be crushed. By reducing the weight, the crusher ring hammer 1 can be rotated more smoothly and the material cost can be reduced.
If the base portion 2 has the same thickness as the head portion 4, the object to be crushed is caught on the crusher ring hammer 1, and the object to be crushed also rotates with the rotation of the crusher ring hammer. The hit by 4 is not made efficiently. On the other hand, if the base portion 2 is thinned as described above, the object to be crushed easily escapes through the base portion 2, so that the catch is easily eliminated. Therefore, the hitting is more efficient.

  Stroke portions 6 are provided so as to protrude from both ends of the rotation direction of each head portion 4, and when the crusher ring hammer 1 rotates clockwise, the head portions 6 a, 6 b, 6 c, 6 d and When rotating counterclockwise, the head portions 6e, 6f, 6g, and 6h strike the object to be crushed and crush the object to be crushed.

  Although this kind of crusher ring hammer 1 can be formed by a known manufacturing method such as a casting method or a forging method, in many cases, an inexpensive casting method is used in terms of cost. In this casting method, as shown in FIG. 6, a hollow mold 7 having a shape corresponding to the shape of a cast product is produced by solidifying sand or the like, and the mold 7 is penetrated from the surface of the mold 7 to the inside of the hollow mold. This is performed by pouring molten metal (molten metal) through the sprue 8.

  The sprue 8 is also used to quickly melt the molten metal in every corner of the mold 7, particularly where there is a step in the mold 7 due to a shape such as a partial thickness difference of the cast product. It is necessary to make the position and the number appropriate in order to spread it reliably and reliably. For example, in the crusher ring hammer 1 shown in FIG. 5, the molten metal is poured quickly in correspondence with approximately the center position in the rotational direction of each of the four head parts 4 designed to be thicker than the base part 2. It is preferable to form the gate 8 having a sufficiently large inner diameter.

  The molten metal poured into the mold 7 from the gate 8 spreads evenly from the center of the portion that becomes the head portion 4, and the molten metal overflowing from the portion that becomes the head portion 4 flows into the portion that becomes the base portion 2 and spreads. (See arrow f in FIG. 6) Finally, the mold 7 is filled. In this way, when the molten metal is evenly poured into the portion to be the head portion 4, the cooling and solidification speed is substantially uniform in each portion of the head portion 4. If the cooling and solidifying rate is substantially uniform, the physical property values such as material hardness in each part of the head part 4 are also substantially uniform, and the reliability of the head part 4 is high.

The crushing time of the material to be crushed depends on the crushing ability of the crusher ring hammer. In order to increase the crushing capacity, the number of heads provided on the outer periphery of the base part of the crusher ring hammer may be increased to increase the number of striking parts contributing to crushing the object to be crushed.
However, if the number of the head portions provided so as to protrude from the base portion is increased, the weight of the crusher ring hammer is greatly increased. When this weight increases, the rotation around the rotation axis of the crusher ring hammer is lost, which may reduce the crushing capacity, and also increases the material cost.

  Then, this invention makes it a subject to improve the crushing capability, without causing the weight increase of the said ring hammer for crushers.

In order to solve the above-mentioned problems, the present invention provides a crusher ring hammer in which a hole is provided in the center of a base portion and a head portion protruding in the outer diameter direction is provided on the outer periphery around the hole. An arcuate surface formed along the circumferential direction around the hole, a recess is provided in the arcuate surface, and the head part is rotated around a support shaft that supports the base part, and the arcuate surface and the inner wall of the recess It is possible to hit the object to be crushed at the ridgeline formed.
If it does in this way, in addition to the hit | damage part of the both ends of the rotation direction of the said head part, since the said ridgeline part also acts as a hit | damage part, the number of hit | damage parts which contribute to a hit increases. Therefore, the frequency | count of hitting a to-be-crushed object per fixed time increases, and the crushing capability of a to-be-crushed object increases.

  If this concave portion is a groove formed along the length direction of the hole, the ridge line portion formed by the arc-shaped surface and the inner wall of the groove acts as a striking portion, and therefore corresponds to the length of the ridge line portion. Hitting efficiency increases.

  Further, if a plurality of the grooves are arranged in the circumferential direction around the hole, the number of hitting portions increases corresponding to the number of the grooves arranged in parallel, so that the hitting efficiency is further increased.

Also, a mold for molding the crusher ring hammer, wherein the crusher ring hammer is a cast product formed by pouring the molten metal into the mold and curing the molten metal, and the head The portion is formed to be thicker than the base portion along the length direction of the hole, and one end face in the length direction of the hole in the thick head portion has a flat surface, The pouring gate for pouring the molten metal into the mold faces the flat surface of the inner surface of the mold corresponding to the flat surface of the one end surface, and the flat surface of the inner surface of the mold protrudes in the inner diameter direction to form an arc. The at least part of the gate is located on the inner diameter side of the straight line connecting both ends of the arc .
In this way, the molten metal can be quickly poured into the mold from the gate.

  In general, when the ring hammer for a crusher is manufactured by a casting method, when the molten metal is not quickly poured into the mold, the previously poured molten metal is rapidly cooled in the mold that is not yet warmed. The molten metal that has been solidified and then poured is gradually cooled in the already heated mold and solidified. Therefore, a difference arises in a cooling rate between both. This difference in cooling rate has a great influence on physical property values such as material hardness, and therefore the physical property values may vary for each part in the head portion.

Accordingly, if at least a part of the pouring gate is positioned on the inner diameter side of the straight line connecting both ends of the arc as described above, a larger pouring gate can be formed, so that the pouring of the molten metal becomes quicker. Since the cooling rate in the mold approaches uniformly, the physical property values are less likely to vary.

Also, a crusher ring hammer formed using the mold, wherein the head part of the crusher ring hammer is formed thicker than the base part along the length direction of the hole. In addition, one end surface in the length direction of the hole in the thick head portion has a flat surface, and the flat surface protrudes in the inner diameter direction to form an arc, and is at least one of the pouring gates of the mold. The portion can be positioned on the inner diameter side of a straight line connecting both ends of the arc .
In this way, since the molten metal is poured quickly, variations in the physical property values for each part of the head portion can be suppressed.

According to this invention, since the crushing capability can be improved without causing an increase in the weight of the crusher ring hammer, the crushing efficiency of the object to be crushed is increased.
Moreover, when the said sprue which has the said sufficiently large internal diameter is formed, since a molten metal can be poured quickly into a casting_mold | template, a uniform physical property value can be ensured over the whole ring hammer for crushers.

  An embodiment of the present invention will be described with reference to FIG. The crusher ring hammer 1 is provided with a hole 3 at the center of the base part 2 and a head part 4 protruding in the outer diameter direction on the outer periphery of the base part 2. The outer periphery of the head portion 4 is an arcuate surface 4 a formed along the circumferential direction around the hole 3, and a single groove 5 is formed in the arcuate surface 4 a along the length direction of the hole 3. Yes.

  The ridgeline portion formed by the arcuate surface 4a and the inner wall of the groove 5 and both ends in the rotational direction of the head portion 4 are hitting portions 6 that hit the object to be crushed. When the crusher ring hammer 1 is rotated in one direction, the number of hitting parts 6 contributing to hitting the object to be crushed is one for each head part 4 when the groove 5 is not formed. Thus, by forming one groove 5 and using the ridge line portion of the groove 5 as the striking portion 6, the number of striking portions 6 per each head portion 4 is doubled. Therefore, the number of times of hitting the object to be crushed per certain time is doubled, and the crushing capacity is correspondingly increased.

  Moreover, since the material used corresponding to the volume of the groove | channel 5 reduces by forming the groove | channel 5, material cost also reduces.

  The head part 4 of the crusher ring hammer 1 is formed to be thicker than the base part 2 along the length direction of the hole 3 formed in the crusher ring hammer 1 as compared with the base part 2. ing. In this way, since the base portion 2 that hardly contributes to crushing can be reduced while securing the function of the head portion 4 that contributes to crushing, the crusher ring hammer 1 can be easily rotated as described above. The crushing capacity is further increased. Moreover, material cost can also be reduced.

  The crusher ring hammer 1 is manufactured by the above-described casting method. For this casting, a mold 7 formed by solidifying sand in accordance with the shape of the crusher ring hammer 1 is used. In the mold 7, a pouring gate 8 is formed so as to face the flat surface of the inner surface of the mold 7 corresponding to the flat surface 4 b of the head portion 4 from the surface of the mold 7 in order to flow the molten metal into the mold 7. Yes.

Further, the flat surface 4b protrudes in the inner diameter direction to draw an arc, and at least a part of the pouring gate of the mold is positioned on the inner diameter side with respect to a straight line connecting both ends of the arc. In addition, it is possible to form the sprue 8 having a sufficient inner diameter for promptly pouring the molten metal into the mold 7. Further, since the gate 8 is formed at the center in the rotational direction, the molten metal poured from the gate 8 spreads in both the rotational direction and the counter-rotating direction from the position where the head portion 4 is formed (FIG. 2). (See arrow f in the middle).
The gate 8 is provided in each of the four head portions.

more than

As the flat surface 4b is designed to be wider, the gate 8 having a larger inner diameter can be formed. For example, only a small gate having an inner diameter w2 can be formed on the flat surface shown in FIG. A spout 8 having a large inner diameter w1 can be formed on the flat surface (w1> w2).
Therefore, the molten metal having a high temperature and high fluidity can be quickly poured into the mold 7, and the molten metal can be distributed to every corner of the mold 7. Since the molten metal poured into the mold 7 in this manner is cooled uniformly, uniform physical property values (such as hardness) can be obtained over the entire crusher ring hammer 1 (particularly the head portion 4). .

  As shown in FIG. 3, the crusher ring hammer 1 is attached to a crusher, and the support shafts 10 provided at both ends of the rotor 9 are inserted into the holes 3 provided in the center of the base body 2. It is. Since the inner diameter of the hole 3 is larger than the outer diameter of the support shaft 10, the crusher ring hammer 1 can freely rotate when a force to rotate around the support shaft 10 acts on the crusher ring hammer 1. To do. The configuration of this crusher has been described with reference to FIG.

  When an object to be crushed is sandwiched between the crusher ring hammer 1 and the great bar 11, the movement of the head part 4 of the crusher ring hammer 1 is once locked by the object to be crushed by the great bar 11. Further, when the rotor 9 further rotates, the above-mentioned catch is released, and when the rotor 9 is released, the crusher ring hammer 1 is given a rotational force around the support shaft 10 by the rotational force of the rotor 9. The crusher ring hammer 1 that has obtained the rotational force in this way strikes other objects to be crushed, and the crushing further proceeds.

  The number of grooves 5 formed in the arcuate surface 4a of each head portion 4 of the crusher ring hammer 1 can be appropriately selected as long as the function of the striking portion 6 formed in each head portion 4 is not impaired.

  In this embodiment, the groove 5 has a V-shaped cross section (see FIG. 1A), but the ridge line formed by the arcuate surface 4a and the inner wall of the groove 5 functions effectively as the striking portion 6. If present, the cross-sectional shape is not particularly limited to the above.

1 shows an embodiment, (a) is a front view, (b) is a bb cross-sectional view in (a). The casting_mold | template of the embodiment is shown, (a) is sectional drawing, (b) is a partial cutting front view The application example of the embodiment is shown, (a) is a cut front view, (b) is a partially cut side view. An application example of an embodiment of the prior art is shown, (a) is a cut front view, (b) is a partially cut side view. The ring hammer for crushers of the same embodiment of the prior art is shown, (a) is a perspective view, (b) is a front view, and (c) is a partial sectional view. The mold of the ring hammer for crushers of the same embodiment of the prior art is shown, (a) is a sectional view, (b) is a partially cut front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ring hammer for crusher 2 Base | substrate part 3 Hole 4 Head part 4a Arc-shaped surface 4b Flat surface 5 Groove 6 Blowing part 7 Mold 8 Pouring spout 9 Rotor 10 Support shaft 11 Great bar 12 Casing 13 Loading port 14 Rotating shaft 15 Bearing

Claims (5)

In the ring hammer (1) for a crusher provided with a hole (3) in the center of the base part (2) and a head part (4) projecting in the outer diameter direction around the hole (3),
The outer periphery of the head portion (4) has become a said hole (3) arcuate surface formed along the circumferential direction around (4a), a recess (5) provided on the arcuate surface (4a), said head The object to be crushed can be hit at the ridge line formed by the arcuate surface (4a) and the inner wall of the recess (5) while rotating the portion (4) around the support shaft (10) supporting the base body (2). A ring hammer for a crusher characterized by The crusher ring hammer according to claim 1, wherein the recess (5) is a groove (5) formed along the length direction of the hole (3). The ring hammer for a crusher according to claim 2, wherein a plurality of the grooves (5) are juxtaposed in the circumferential direction around the hole (3). A molding mold (7) for use in molding the crusher ring hammer (1) according to any one of claims 1 to 3, wherein the crusher ring hammer (1) is disposed in the mold (7). The head part (4) is formed to be thicker than the base part (2) along the length direction of the hole (3). In addition, one end surface in the length direction of the hole (3) in the thick head portion (4) has a flat surface (4b), and the molten metal is poured into the mold (7). sprue (8) is adapted to face the flat surface of the mold (7) the inner surface corresponding to the flat surface of the one end face of the (4b), the flat surface of the mold (7) inner surface, an inner diameter direction At least part of the gate (8) , Molding mold crusher ring hammer, characterized in that located on the inner diameter side than the straight line connecting both ends of the arc. 5. A crusher ring hammer (1) molded using the ring hammer molding mold (7) according to claim 4, wherein the head portion (4) extends along the length of the hole (3). In addition to being formed thicker than the base portion (2), one end face in the length direction of the hole (3) in the thick head portion (4) has a flat surface (4b). The flat surface (4b) protrudes in the inner diameter direction to draw an arc, and at least a part of the gate (8) of the mold (7) is located on the inner diameter side with respect to a straight line connecting both ends of the arc. A ring hammer for a crusher, characterized by

Images