JPH0451876Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a mounting structure for a striking plate in an impact crusher that allows the striking plate to be used again without replacing it by reversing the striking plate. It is.

[Conventional technology] In an impact crusher, materials to be crushed, such as stones and ores, are placed in a box-shaped crushing chamber made of steel plates, etc., and multiple crushers are mounted radially around the periphery of a rotor that rotates inside the chamber. It is configured so that it collides with a striking plate and is thrown away, and is further collided with a collision plate protruding into the chamber to shatter it.

Needless to say, the striking plate that directly collides with the input material is made of wear-resistant material, but since it is used under extremely harsh conditions, the impact surface (the side surface in the rotational direction of the rotor) is rapidly damaged in a relatively short period of time. It wears out and loses its shape. Normally, the striking plate is removed and replaced with a new one, but a structure has been developed in which the striking plate is flipped upside down and replaced and used again. Publication Figure 3 A, B}
There is.

This is done by attaching a striking plate 1a having a convex shape 9a on its back surface to a corresponding notch 5a of a rotor 2a (rotation support plate).
A striking plate holding arm 19 having a concave shape 18 that fits into a convex shape on the rear side of the striking plate is disposed with its both sides interposed between the striking plates, and is movable in the centrifugal direction between the corresponding rotors, and Pivotally supported for rotation,
A holder 20 for locking the movement of the striking plate holding arm in the centrifugal direction is provided on the corresponding rotor, and protection for holding the striking plate holding arm 19 in a position where it fits into the convex shape 9a of the striking plate. Board 21
is configured to be attached to the rotor. As a result, by opening the striking plate holding arm, the striking plate can be inserted from above, so even if multiple striking plates are lined up in the axial direction, the striking plates can be inserted and removed from above, making replacement easy. It claims that it will help you become better, and that you will get other effects. Another example of the prior art having the same purpose is Japanese Patent Publication No. 42-3152 shown in FIG. In this configuration, the surface of the striking plate is formed by a, b-g, h, which has a striking surface a-b that collides with the object to be crushed, fixed bottom surfaces c-d, f-g, and the back surface is the center of gravity of the striking member. Similar to the above, it is characterized by having curved surfaces a', b' to g', h' so as to be point symmetric with s as the center. Then insert the lower half of the striker into the insertion seat a-
Insert the wedge so that the b side faces the direction of rotation, and
3a and the wedge tightening bolt 14a, and the crushing operation begins. If the striking surfaces a and b are worn out, loosen the wedge tightening bolt, remove the striking element, turn it upside down and left/right, and reuse it.
The company claims that it can provide efficient grinding action in the same condition as new.

[Problem to be solved by the invention] However, the former of the above conventional technology (Figure 3)
Since the striking plate holding arm 19 for holding the striking plate 1a is pivotally supported within the rotor 2a so as to be movable in the centrifugal direction, the striking plate is in a floating state with respect to the rotor, and there is no possibility of collision with the object to be crushed. Depending on the presence or absence of collision force, the shock plate repeatedly moves in the centrifugal direction or in the reverse direction, causing damage such as wear to parts affected by the movement of the striking plate, such as the striking plate, rollers, striking plate holding arm, holder, and pins. There is a problem that the lifespan is shortened.

In addition, the impact plate collides with the object to be crushed by the inertial force of the impact plate alone, without the inertia of the rotor, holding arm, etc., and then collides with the rotor etc. together with the object to be crushed, so the impact is given to the object to be crushed. Another major problem is that the force is often dispersed, and the crushing ability is not improved.

In addition, in the latter conventional technology (Fig. 4), as shown by the cross line, after the impactor is worn out due to crushing or continued crushing, the tip part is most severely worn out. Naturally, as the wear progresses, the surface in the rotational direction retracts almost uniformly over the entire a-b plane, and the tip of the wear line approaches the fixed bottom surface c-d, so it is difficult to hit until this state. If you continue to use the hammer, even if it is reversed, the contact surface of the wedge that connects the hammer and rotor will disappear, or the wall thickness will be lost, resulting in an extremely low strength and the tightening of the hammer will become extremely unstable. It becomes impossible to reuse it. That is, the limit of wear that is allowed until the striking element is reversed is considerably limited, and it is difficult to imagine that the time that one striking element can withstand use will be extended very much.

In order to solve the above-mentioned problems, the present invention aims to provide a striking plate that can be easily turned upside down and has a mounting structure that is integrally fixed to the rotor.

[Means for Solving the Problems] The mounting structure of the striking plate in the impact crusher according to the present invention is such that the striking plate 1 has a rectangular groove 8 in the center of the side surface in the rotor rotation direction, and a rectangular groove 8 in the center of the opposite side surface. A dovetail protrusion 9 that amplifies toward the tip is provided in a protruding manner, and the other portions are formed in a substantially rectangular shape that is vertically symmetrical with a plane of symmetry that connects the center plane of the groove 8 and the protrusion 9 in the rotor axial direction. On the other hand, the notch 5 of the rotor is provided with a protrusion 10 on the side surface in the rotational direction of the rotor into which the striking plate groove 8 fits, and the opposite side surface forms an enlarged space that can accommodate the striking plate protrusion 9. The upper end of the notch 5 is a canopy-shaped crown body 12 that comes into contact with the side surface of the striking plate.
The inclined surface of the protrusion 9 of the striking plate, which is covered by the rotor and fitted into the rotor sideways along the side surface of the crown body 12 at the upper end of the notch and the end face of the protrusion 10 at the center on the opposite side, forms the rotor crown. The above-mentioned problem was solved by the fact that the bolt 13 interposed between the rotor crown body 12 and the bottom surface of the rotor crown body 12 is tightly pressed together with the bottom surface of the rotor crown body 12 by being tightened by the bolt 14.

[Operation/Example] The operation of the present invention will be explained based on FIG. 1 and FIG. 2 showing an example. FIG. 1 is a front view showing the entire impact type crusher in which a striking plate 1 of the present invention is projected from a rotor 2, and the material to be crushed is supplied from an input port 3 into a crushing chamber made of iron plates. A plurality of notches 5 are formed radially in the radial direction on the circumferential edge of the rotor 2 that is fixed to the rotating shaft 4 and rotates.
A striking plate 1 is fitted into each. The object to be crushed is thrown upward by the upper side surface of the rotating striking plate, collides with the surface of the repulsion plate 6, and is crushed by the impact. The crushed material is collected from the bottom of the crushing chamber to the outside.

FIG. 2 is an enlarged partial view showing only the mounting structure of the rotor and the striking plate.

The upper surface of the striking plate 1 in the rotational direction of the rotor (solid line, arrow direction) corresponds to the crushing surface 7, and a rectangular groove 8 is formed in the center of this side surface, while a tip is provided in the center of the side surface on the back side. A protrusion 9 for dovetail grooves that amplifies the area is provided in a protruding manner. On the other hand, on the rotor rotation direction side of the notch 5 of the rotor, a protrusion 10 into which the concave groove 8 of the striking plate fits is provided, and on the other side, the side surface 11 is retracted to form an enlarged space, and the striking plate The protrusion 9 can be accommodated. Further, this side surface is bent into an eave shape at the upper part to form a crown body 12, which extends to the notch.

The striking plate 1 is inserted from both sides of the notch 5 and the second
As shown in the figure, it is fitted sideways along the upper and lower two protruding surfaces of the notch. On the other hand, a wedge-shaped kotsuta 13 is formed as a side end surface along each of the bottom surface of the crown body 12 of the rotor and the inclined dovetail protrusions 9 of the striking plate opposite thereto. 12
side is vertical, and the protrusion 9 side is not vertical but inclined), and this kotta 13 has bolts 14,
The striking plate 1 is fixed to the rotor 2 by being pulled toward the side surface 11 through the nut 15, washer 16, and spring washer 17, and when the nut 15 is tightened, the wedge action causes the P on the rear side of the striking plate 1 to be fixed. The surface is in close contact with the Q surface of the crown body 12, and the bottom surface R and side surface S of the groove 8 on the front side are in close contact with the T surface and U surface of the protrusion 10, respectively, so that the striking plate 1 is integrally attached to the rotor 7. Fixed.

The direction of the moment generated by such a wedge action is shown by the dashed arrow in Fig. 2, and the rear surface of the striking plate is in close contact with the protrusion on the opposite side of the rotation direction of the rotor, and the groove on the front surface is A force is applied to the protrusion on the rotational direction side of the rotor so that the bottom surface is substantially flat in the radial direction of the rotor, and the side surface is in close contact with the outer peripheral surface of the rotor.

[Effects of the invention] As mentioned above, this invention improves the crushing capacity because the striking plate is fixed to the rotor, and furthermore, because the rotor supports the part that collides with the object to be crushed, it has a large effect. Since there is no fear that the striking plate will break even if a lump of the object to be crushed collides with the object, there is no need for the troublesome effort of sorting and supplying the object to be crushed.

In addition, when the crushing surface 7 becomes worn out during use, since the concave grooves 8 and the protrusions 9 of the striking plate are symmetrically arranged in the center, it can be regenerated as if it were new by turning it upside down.
Needless to say, the reversing process is also extremely easy. In this case, as shown by the cross lines in Figure 2, the fractured surfaces facing the rotational direction of the rotor are severely worn away from the tip toward the center, but the major difference from the conventional technology (Figure 4) is that The tightening surface between the child and the rotor is the slope of the dovetail protrusion 9, and since this surface is always on the opposite side to the direction of rotation, it will not be corroded to the end even if wear progresses. Therefore, if you turn it over and tighten it again, it will be in a strong tight state just like when it was new, and you can record the maximum service life of the striking element.

[Brief explanation of the drawing]

Fig. 1 is an overall view of the embodiment of the present application, Fig. 2 is a front sectional view showing the main parts thereof, Fig. 3 A and B are front sectional views showing the prior art, and Fig. 4 is a front sectional view showing another prior art. Cross-sectional view. 1...Blow plate, 2...Rotor, 5...Notch,
8...Concave groove, 9...Protrusion, 10...Protrusion, 11...
...Side, 12...Coron, 13...Kotuta.

Claims (1)

[Scope of utility model registration request] In an impact type crusher in which a plurality of notches 5 are provided radially in the periphery of a rotor 2 fixed to a rotating shaft 4, and a striking plate 1 is fitted into the notches 5,
The striking plate 1 has a rectangular groove 8 at the center of the side surface in the rotor rotation direction, and a dovetail protrusion 9 that amplifies toward the tip at the center of the opposite side surface, and the other parts are formed by the groove 8. The notch 5 of the rotor is formed into a vertically symmetrical substantially rectangular shape with the surface connecting the center plane of the protrusion 9 in the rotor axial direction as a symmetrical plane, while the notch 5 of the rotor is a protrusion in which the striking plate groove 8 fits on the side surface in the rotational direction of the rotor. 10,
The opposite side surface forms an enlarged space that can accommodate the striking plate protrusion 9, and the upper end of the notch 5 is covered with an eave-shaped crown body 12 that comes into contact with the side surface of the striking plate. The inclined surface of the protrusion 9 of the striking plate, which is fitted into the rotor sideways along the side surface of the body 12 and the end face of the protrusion 10 at the opposite center, is interposed between the bottom surface of the rotor crown body 12. A mounting structure for a striking plate in an impact type crusher, characterized in that the striking plate is pressed and tightly attached to the bottom surface of a rotor crown body 12 by being tightened by a bolt 14 of a crusher 13.