JPS5924860B2 - Impact crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impact crusher, and particularly to an improvement in a striking plate.

The striking plate of a 3C impact crusher is generally shown in Figure 1.
.

A striking plate seat 4 having approximately the same length as the striking plate 3 is provided on the rotational circumference of the striking plate holding member 2 which is pivotally supported on the rotor main shaft 1, and the striking plate 3 is mounted on the convex portion 5 of this striking root receiving seat 4. The recessed portion 6 is fitted. When the striking plate 3 wears out for a certain 35 minutes, it is used by turning it over or replacing it. Incidentally, the tip of the striking plate 3 protruding from the outer periphery of the striking plate holding member 2 is thickened as shown in Fig. 1 in order to improve impact resistance and extend life. The striking plate holding member 2 is rotated at high speed by the rotor main shaft 1, and the material to be crushed that is put into the crusher is crushed by impact, so that it wears as shown in Fig. 2, and the amount of wear reaches a certain level. When the value exceeds the value a, slippage occurs between the crushed material and the striking surface, the crushed particle size decreases significantly, and the wear of the striking plate 3 increases at an accelerated rate. As a result, the area of the smooth tip surface due to wear of the percussion root 3 increases, resulting in a significant decrease in crushing efficiency. For this reason, when the amount of wear on the tip of the striking plate 3 exceeds a certain value a, the crushing machine shown in Fig. 1, which rotates the striking root holding member 2 only in one direction, A reduction in particle size is inevitable.

In order to avoid a decrease in the crushed particle size, the striking plate 3 is removed from the holding member 2, reversed, and reattached to the holding member 2 for use, which reduces the usage rate of the striking plate 3. Also, the striking plate holding member 2
In the case of a crusher configured to rotate in forward and reverse directions, the rear surface of the tip of the striking plate is used by reversing the holding member without removing the striking plate from the holding member. When the amount of wear on the tip of the rear surface exceeds a certain value, the front surface is used again, and the object to be crushed is crushed using the new worn surface. However, even if the front and rear surfaces of the striking plate are used alternately in this way, the amount of wear on the striking plate increases during the crushing of the object to be crushed.
Since the wear surface of the tip increases every moment, it is impossible to maintain a constant crushing efficiency. Therefore, in order to maintain the crushing efficiency as constant as possible, the front and rear surfaces of the striking plate must be used alternately frequently, which makes the operational management of the crusher complicated. The present invention was made in view of the above circumstances, and it is possible to maintain constant crushing efficiency by keeping the amount of wear at the tip of the striking plate constant during the crushing of the object to be crushed. It is an object of the present invention to provide an impact type crusher in which the interval between alternate use of surfaces can be increased.

The impact type crusher of the present invention is an impact type crusher in which the impact plates are held at equal angular intervals in the circumferential direction of the impact plate holding member which is pivotally supported by a rotor main shaft, and the impact type crusher is provided with It is characterized in that the end of the protruding striking plate is formed to have a V-shaped side cross section, and both front and rear sides thereof have a uniform thickness in the height direction.

An example of an impact crusher according to the present invention will be explained below with reference to FIG. The impact Ql. A striking plate seat 4 having substantially the same length as the striking plate 3' is provided, and a concave portion 6 on the front surface of the striking plate 3' is fitted into a convex portion 5 of the striking plate seat 4. With respect to the rotor having such a structure, two collision plates 8 are arranged side by side in the upper part of one side inside the casing 7 of the crusher, the upper ends of each of which are pivotally supported by a pin 9, and an azimuth star whose lower back surface passes through the casing 7. It is supported by a rod 10, and the size of the gap between the rotor and the lower end of the collision plate 8, that is, the size of the gap between the impact crushed product is ground to the required particle size, is adjusted by the adjuster rod 10. The adjuster rod 10 is pressed by a spring 11 with a constant load, so that it slides upward when foreign matter is mixed in.

Note that 12 is a supply port for the material to be crushed, and 13 is an introduction chute. The striking plate 3' has a distal end 3a protruding from the outer periphery of the striking plate holding member 2, which is gradually made thicker toward the distal end surface, and a concave portion 3b is formed in the middle of the thick distal end 3a from the distal end surface over the entire width direction. That is, the tip portion 3a is formed to have a V-shaped side cross section, and both the front and rear sides of the recess 3b have a uniform thickness in the height direction.

According to the impact type crusher configured as described above, when the impact plate holding member 2 is rotated at high speed by the rotor main shaft 1 and the material to be crushed introduced into the crusher is crushed by impact, the tip of the impact plate 3' is crushed. One end face of the tip part 3a wears as shown in FIG. 4, and when the amount of wear reaches a certain value a', the amount of wear on the one end face of the tip part 3a does not increase any further and the wear remains constant. The amount will be a.

Therefore, the area of the smooth tip surface due to wear becomes constant, the crushing efficiency becomes constant, and the power consumption for operating the crusher becomes constant. In addition, the striking plate 3' can be used continuously for a long time until one side of the V-shaped tip part is completely worn out without significantly reducing the crushed particle size as in the conventional case. When one side of the tip of the striking plate 3' is completely worn, remove the striking plate holding member 2.
Remove the striking plate 3' from the striking plate seat 4 of the
into the convex portion 5 of the striking plate seat 4. Thus striking plate 3
It can be used continuously for a long time until the other side of the tip of the letter ' is completely worn out as described above. Thereafter, the remaining front and rear surfaces of the striking plate 3/ that protrude from the outer periphery of the striking plate holding member 2 are used alternately as in the conventional case. Incidentally, the front and rear end surfaces of the front and rear end portions 3a of the side cross-sectional shape of the impact) Fl3' may be finished in advance into a shape that will become abrasion surfaces due to the crushing of the object as shown in FIG.

In this way, the amount of wear on the striking plate 3' becomes uniform from the beginning of the crushing of the object to be crushed, so that the crusher can be operated efficiently. Furthermore, the striking plate 3' in the practical example above is fixed to the striking plate seat 4 of the striking plate holding member 2 of a crusher in which the rotor rotates only in one direction, but the striking plate 3' When the striking plate 3' is held on the striking plate holding member 2' of the crusher shown in the figure, convex portions 5' are provided on both front and rear surfaces of the striking plate 3', and these convex portions 5' are spaced equiangularly apart from the striking plate holding member 2'. It is preferable to fit into and hold the recess 6' on the inner surface of the notch groove 14 provided at the position.

In this case, the striking plate 3' is used continuously for a long period of time by rotating the rotor in the forward direction until one side of the letter-shaped tip is completely worn out, and then used by rotating the rotor in the opposite direction until the other side of the tip is completely worn out. .

Thereafter, the remaining front and rear surfaces of the striking plate 3' protruding from the outer periphery of the striking plate holding member 2' are used by alternately rotating the rotor forward and backward. Furthermore, although only one end of the hit plate 3' described so far is formed with a V-shaped side cross section, both ends are formed with a V-shaped side cross section as shown in FIGS. 7A and 7B. After using both the front and rear sides alternately as described above, the blow f! 3' may be replaced with the striking plate holding members 2, 2', and the front and rear sides of the V-shape at the other end may be used alternately as described above. As described in detail above, the impact-type crushed material of the present invention has ends formed at equal angular intervals in the circumferential direction of the striking plate holding member supported by the rotor main shaft, and the front and rear both sides thereof being elevated. Since the striking plate has a uniform thickness in the horizontal direction, the amount of wear on the tip of the striking plate due to the impact crushing of the object due to the rotation of the rotor can be kept constant, and the tip surface due to wear can be kept constant. Since the area of the crusher is constant, the crushing efficiency can be maintained constant, and the power consumption for operating the crusher is constant, which greatly reduces the power cost per product unit compared to the conventional method.

In addition, the striking plate can be used continuously for a long time until one side of the letter-shaped tip is completely worn out, without having to use the front and back sides alternately as often as in the past, making the operation management of the crusher extremely simple. It has excellent effects.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional impact crusher, Figure 2 is an explanatory diagram of the progress of wear of the impact plate in the crusher, and Figure 3 is a longitudinal cross-sectional view of a conventional impact crusher.
The figure is a longitudinal sectional view showing an example of an impact crusher according to the present invention.
Fig. 4 is an explanatory diagram of the progress of wear of the striking plate in the crusher, Fig. 5 is a diagram showing a partial modification of the striking plate, and Fig. 6 is an illustration of other impact type crushers according to the present invention. 7A and 7B are views showing other examples of the impact plate in the impact type crusher according to the present invention. 1... Rotor main shaft, 2, 2'... Strike plate holding member, 3, 3ξ... Strike plate, 3a...
...Tip, 3b...Concave, 4...Blow plate seat, 5,5'...Protrusion, 6,6'...
... recess, 7... casing, 8...
・Collision plate, 9...pin, 10...adjuster rod, 11...spring, 12...
. . . Supply port for materials to be crushed, 13 . . . Introduction chute, 14 . . . Notch groove.

Claims (1)

[Claims] 1. In an impact crusher comprising a striking plate holding member supported by a rotor main shaft and holding striking plates at equiangular intervals in the circumferential direction,
An impact type crusher characterized in that the end of the striking plate protruding from the outer periphery of the striking plate holding member is formed to have a V-shaped side cross section, and both front and rear sides thereof have a uniform thickness in the height direction.