JP3234200B2 - Impact blade holding structure of impact crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a striking blade holding structure of an impact crusher used for crushing rocks in a quarry.

[0002]

2. Description of the Related Art As shown in FIG. 9, in an impact crusher 10, a striking blade 51 can be attached to and detached from a casing 30 having a raw material inlet I at an upper portion and a crushed material outlet O at a lower portion. A rotor 20 is provided rotatably about a horizontal axis as a center of rotation. Between the rotor 20 and the casing 30,
A repulsion plate 31 is provided.

As shown in FIG. 10, the rotor 20 comprises a rotor shaft 4 having both ends supported by bearings 21, and a plurality of disk-shaped disk plates 3 fixed at equal intervals to the rotor shaft 4. (Not shown) is transmitted through a pulley 22 to enable high-speed rotation. On the outer periphery of the disk plate 3, the holding grooves 5 are arranged at regular intervals, and
Are provided so as to coincide with each other, and a hitting blade 51 made of wear-resistant cast steel is held in these holding grooves 5 via a holder 52.

FIG. 11 shows details of a conventional hitting blade holding structure. That is, a convex portion 5a is provided on the left and right sides of the outer end portion of the holding groove 5 on the outer periphery of the disk plate 3, and a concave portion 52a that fits with the convex portion 5a is provided on the back surface of the holder 52. It is attached to the left and right convex portions 5a so as to face each other. A concave portion 52b is formed on the surface facing the holding groove center side of the holder 52, and a convex portion 51a that meshes with the concave portion 52b of the holder 52 is formed on the striking blade 51. Convex part 5
1a, the striking blade 51 is held in such a manner that the striking blade 51 does not fall out into the holding groove 5 bottom side when the rotor 20 stops rotating in the radial direction as the rotor 20 rotates. Have been. The tangential force generated by the crushing is maintained by the flat surfaces 51b and 52c of the impact blade 51 and the holder 52, each having no unevenness, contacting each other.

A lock pin mounting portion 52d is provided on the side surface of the holder 52.
A lock pin 53 is inserted into 2d and is fixed by a split pin 54. The lock pin 53 is in contact with the side surface of the convex portion 51a of the striking blade 51 to limit the axial movement of the striking blade 51. When the crushing operation is performed by using the impact crusher 10, the raw material M supplied from the upper input port I includes the striking blade 51 of the rotor 20 rotating at high speed and the repulsion plate 31 disposed around the blade 51. And is crushed by impact, and is discharged as a product P from a lower outlet O.

As the crushing operation is continued, the impact blade 51 gradually wears, and the crushing efficiency is reduced.
In order to stabilize the operation, the impact blade 51, which is a worn part, is required.
Need to be replaced regularly. Therefore, as shown in FIG. 12, the impact-type crusher 10 is provided with an opening / closing mechanism using a hydraulic cylinder 32 and the like, so that the casing 30 can be opened and closed.

When replacing the striking blade 51, the hydraulic cylinder 32 is extended to open the casing 30, and the holding groove 5 for holding the striking blade 51 that needs to be replaced becomes horizontal (at 3 o'clock in the clock). Position), the rotor 20 is fixed. Then, the worn striking blade 51 is pulled out from between the holders 52 in this state, and a new striking blade 51 is inserted between the holders 52.

[0008]

However, in the hitting blade holding structure of the conventional impact type crusher, the hitting blade 51 is attached to the holder 52.
12, first, the impact blade 51 is horizontally held on a gantry 33 provided in the impact crusher 10 as shown in FIG. 12, and then the convex portion 51 a of the impact blade 51 is mounted. And the concave portion 52b of the holder 52 is aligned with each other.
However, in many cases, the striking blade 51 is tilted during the movement, and the convex portion 51a and the concave portion 52b are caught and cannot be mounted smoothly. did.

The impact blade 51 is heavy and the replacement operation is very painful and dangerous for the operator. The replacement of the worn parts must be performed by stopping the impact crusher 10 and the related devices. In addition, the longer the replacement time, the lower the productivity. Therefore, it is desirable that the impact blade holding structure be easy to exchange the impact blade 51.

In the impact blade holding structure of the impact crusher, the impact force is applied to the holder 52 and the flat surface 52 of the impact blade 51.
c and 51b are held in contact with each other, and depending on the state of the clearance, rattling occurs when a large impact force is applied. Further, since the movement of the striking blade 51 in the axial direction is regulated by the lock pin 53 on the side surface of the holder 52, it is effective when the striking blade 51 moves toward the lock pin 53 side. The movement away is restricted by the lock pin 53 of the holder 52 located on the back side of the striking blade 51 provided side by side in the axial direction.

During the crushing operation, a force (centrifugal force) that tends to fly out in the radial direction due to the high-speed rotation of the rotor 20 and a tangential force (impact force) generated by impact crushing constantly act on the striking blade 51. Thus, the striking blade 51
In a hitting blade holding structure in which rattling is likely to occur, the crushing efficiency may decrease. The present invention solves the above-mentioned problem in the impact-type crusher, in which the impact-type blade can be easily replaced and the impact-type crusher can be firmly and reliably held. The purpose is to provide a structure.

[0012]

According to the present invention, a plurality of holding grooves are provided at equal intervals on the outer periphery of a plurality of disk plates provided at predetermined intervals on a rotor shaft, and the phases of the respective disk plates coincide with each other. In a striking blade holding structure of an impact type crusher for holding a striking blade via holders mounted on both sides of the holding groove, the holder is configured to be fitted with a protrusion of the holding groove of an adjacent disk plate. And a connecting portion for connecting the main body portion, the main body portion of the holder is provided with a tapered surface on the center side of the holding groove, in which the distance between the opposing holders decreases as going radially outward, the holder A pin hole is provided at the center of the connecting portion of the connecting member, and the striking blade is provided with a tapered surface so as to abut against the tapered surface of the body portion of the opposing holder. By providing a long slot and inserting a pin to limit the drop of the hitting blade and the axial movement of the hitting blade when the rotation of the rotor is stopped, into the pin hole of the connecting part of the holder and the long hole of the hitting blade The above-mentioned problem has been solved.

When mounting the hitting blade, the concave portion of the main body of the holder is previously fitted and fixed to the convex portion of the holding groove of the disk plate, and the rotor is rotated to rotate the holding groove to which the holder is mounted. Is positioned horizontally. next,
The striking blade is held horizontally and opposed to the gap between the holders in the holding groove, and further, the bottom of the striking blade is positioned so as to be near the groove bottom of the holding groove where the striking blade is mounted, and this state is maintained. While inserting. When the striking blade has moved to a predetermined position, this time, the striking blade is pulled radially outward. Then, since the pin hole provided in the connecting portion of the holder and the elongated hole provided in the striking blade coincide with each other, a pin is inserted into the pin hole to complete the mounting of the striking blade.

When the mounting of the impact blades in all the holding grooves of the disc plate is completed, the crushing operation is started. When the rotor rotates at a high speed, the impact blades are moved radially outward by a centrifugal force acting on the impact blades. The taper surface provided on the main body and the taper surface provided on the striking blade are in close contact with each other, and the striking blade is held firmly. Then, the raw material supplied from the upper raw material charging port is crushed between the impact blade of the rotor rotating at high speed and the repulsion plate disposed around the blade, and is discharged as a product from the lower discharging port. During the crushing operation, the impact blade is subjected to a centrifugal force, which tends to fly radially outward due to the rotation of the rotor, and a tangential impact force caused by impact crushing, to the tapered surface provided on the main body of the holder and to the impact blade. Is firmly held by the close contact between the tapered surfaces provided in the above, so that the crushing efficiency does not decrease due to the wobble of the striking blade.

When the crushing operation is completed and the rotation of the rotor is stopped, the centrifugal force that has been applied until that time stops acting on the striking blade, and the close contact between the tapered surface of the striking blade and the tapered surface of the main body of the holder is released. I will Therefore, the striking blade whose stop position is in the upper half of the rotary shaft tends to drop by its own weight, but in that case, it is held by the pin inserted into the connecting portion of the holder. The pin inserted into the connecting portion of the holder also has a function of restricting the movement of the striking blade in the lateral direction.

A guide portion is formed on the side surface of the tapered surface of the impact blade, and the impact blade is brought into contact with the guide portion in parallel with the tapered surface of the main body of the holder when the impact blade moves radially with the rotation of the rotor. When the guide pin for guiding the movement is provided, the movement of the striking blade at the start of the rotation of the rotor is stabilized, so that the tapered surface of the striking blade and the tapered surface of the main body of the holder can be more securely adhered to each other. Thus, the impact blade can be firmly held so as not to move in the lateral direction.

[0017]

FIG. 1 is a side view of a rotor of an impact crusher according to an embodiment of the present invention, FIG. 2 is an explanatory view of an arrangement of a disk plate of the rotor, and FIG. FIG. 4 is a sectional view taken along line BB of FIG. 3, and FIG.
6 is a cross-sectional view taken along the line C-D, FIG. 6 is a cross-sectional view taken along the line D-D in FIG. 4 when the rotor is rotating, FIG. 7 is a cross-sectional view taken along the line D-D in FIG. FIG. 8 is a view taken along line EE of FIG.

The basic structure of the impact crusher is the same as that of the conventional one. That is, as shown in FIG. 9, the impact-type crusher 10 is configured such that the impact blade 1 can be attached to and detached from a casing 30 having an input port I for a raw material M at an upper portion and an output port O for a crushed product P at a lower portion. Rotor 20 is rotatably provided about a horizontal axis as a center of rotation. A repulsion plate 31 is arranged between the casing 30 and the rotor 20. A hydraulic cylinder 32 for opening and closing as shown in FIG.
Is provided.

As shown in FIGS. 1 and 2, the rotor 20 is composed of a rotor shaft 4 having both ends supported by bearings 21 and a plurality of disk-shaped disk plates 3 fixed to the rotor shaft 4 at equal intervals. That is, the rotation of a motor (not shown) is transmitted through the pulley 22 to enable high-speed rotation. In the disk plate 3, holding grooves 5 are provided on the outer circumference at regular intervals so that the phases of the holding grooves 5 of each disk plate 3 coincide with each other.
The impact blade 1 made of wear-resistant cast steel is held via a holder 2.

As shown in FIG. 3, convex portions 5a are provided on both left and right outer end portions of the holding groove 5. The holder 2 includes two body portions 25 and a connecting portion 26 connecting between the two body portions. A concave portion 25a is formed on the back surface of the main body portion 25, and these concave portions 25a are fitted into the convex portions 5a of the holding groove 5 by fitting. The holder 2 is attached so as to straddle two adjacent disk plates 3 and a pair of holders 2 are opposed to each other.

As shown in FIG. 4, the main body 25 is provided with an embedding nut 7a and a bolt 7, and the holder 2 is fixed to the disk plate 3 by screwing the bolt 7 to the embedding nut 7a. . The main body 25 of the holder 2 is provided at the center of the holding groove 5 with a tapered surface 25t in which the distance between the opposing holders 2 decreases radially outward of the disk plate 3, and the striking blade 1 opposes the holder. 2
The tapered surface 1t is provided so as to be in contact with the tapered surface 25t of the main body portion 25, respectively.

A pin hole 2 is provided at the center of the connecting portion 26 of the holder 2.
The striking blade 1 is provided with a long hole 11 extending in the radial direction at the center of the striking blade 1, and the pin 6 is inserted into the pin hole 27 of the connecting portion 26 of the holder 2 and the long hole 11 of the striking blade 1. Is inserted and fixed by the washer 6a and the split pin 6b. When the rotor 20 rotates at high speed, a centrifugal force acts, so that the striking blade 1 moves radially outward with the long hole 11 being guided by the pin 6, and as shown in FIG.
And the tapered surface 25t of the main body 25 of the holder 2 are in close contact with each other, so that the impact blade 1 is firmly held.

When the rotation of the rotor 20 is stopped, the striking blade 1 located above the center of rotation of the rotor shaft 4 drops toward the holding groove 5 by its own weight, but as shown in FIG. 6 is held at a position where it abuts. The main body 25 of the holder 2 has a guide pin 8 projecting therefrom, and is in contact with the side surface 1 s of the tapered surface 1 t of the striking blade 1. When the impact blade 1 moves radially outward due to the rotation of the rotor 20, the relationship between the above-described pin 6 and the elongated hole 11 and the contact between the guide pin 8 and the side surface 1s of the tapered surface 1t cooperate with each other. Since the blade 1 moves in parallel, the tapered surface 2
The contact between the t and 25t is more stable, and the holding of the striking blade 1 can be performed more firmly.

In FIG. 3, guide pins 8 are provided on the left side of the holder 2 on the front side and on the right side of the holder on the rear side (actually, the same parts are arranged in different directions).
If the side surface 1s of the tapered surface 1t of the striking blade 1 is abutted so as to be sandwiched from both sides, the above-described guiding action can be performed more effectively. Here, the tapered surface 1 on the side contacting the guide pin 8
t has a small width (the left-right direction in FIG. 4).

When the impact blade 1 is mounted, the holder 2
The concave portion 25a of the main body portion 25 is fitted into the convex portion 5a of the holding groove 5 of the disk plate 3, and the bolt 7 is tightened and fixed, and the rotor 20 is manually rotated so that only the holder 2 is mounted. The holding groove 5 is positioned horizontally. next,
The striking blade 1 is held horizontally and opposed to a gap between the pair of holders 2 of the holding groove 5, and is further positioned and inserted so that the bottom of the striking blade 1 is near the groove bottom of the holding groove 5.

At this time, since a sufficient distance is secured between the tapered surface 1t of the striking blade 1 and the guide pin 8 of the holder 2, the two do not interfere with each other and hinder the insertion of the striking blade 1. . Since the hitting blade 1 and the holder 2 are not formed with an uneven shape that meshes with each other, they can be easily inserted without being caught and stopped in the middle of insertion.

When the striking blade 1 has moved to a predetermined position, the striking blade 1 is pulled out radially outward. As the striking blade 1 is drawn radially outward, the guide pin 8 gradually comes into contact with the side surface 1s of the tapered surface 1t, and the striking blade 1 is guided and accurately positioned. When the striking blade 1 is further pulled out in the radial direction, the pin hole 27 provided in the connecting portion 26 of the holder 2 and the slot 11 provided in the striking blade 1 coincide with each other. Insert the pin 6 and attach the washer 6a and the split pin 6b to the holder 2 of the striking blade 1.
Installation to the is completed.

When the mounting of the impact blades 1 in all the holding grooves 5 of the disk plate 3 is completed, the crushing operation is started. However, when the rotor 20 rotates at a high speed, a centrifugal force acts on the impact blades 1. Moves radially outward, and the holder 2
The tapered surface 25t provided on the main body 25 and the tapered surface 1t provided on the striking blade 1 are in close contact with each other, and the striking blade 1 is firmly held.

The raw material M supplied from the upper raw material input port I is crushed between the impact blade 1 of the rotor 20 rotating at a high speed and the repulsion plate 31 disposed around the impact blade 1 to produce a product. It is discharged from the lower discharge port O as P. During the crushing operation, the striking blade 1 is provided with a centrifugal force, which tends to fly out in the radial direction due to the rotation of the rotor 20, and a tangential impact force caused by impact crushing, on the tapered surface provided on the main body 25 of the holder 2. Since 25t and the taper surface 1t provided on the striking blade 1 are firmly held by close contact, the striking blade 1 does not wobble and the crushing efficiency does not decrease.

When the rotation of the rotor 20 is stopped after the crushing operation is completed, the centrifugal force that has been applied so far does not act on the striking blade 1, and the close contact between the tapered surfaces 1t and 25t is released. Therefore, the striking blade 1 whose stop position is above the rotation axis of the rotor shaft 4 tends to fall by its own weight, but does not fall to the bottom of the holding groove 5 by the pin 6 attached to the connecting portion 26 of the holder 2 at that time. So that it is kept. The pin 6 also has a function of restricting the movement of the striking blade 1 in the axial direction.

The main body 25 of the holder 2 is provided with a guide pin 8 which is in contact with the side surface 1s of the tapered surface 1t of the striking blade 1 so that the striking blade 1 moves radially outward (projects) as the rotor 20 rotates. When the striking blade 1 is moved in parallel, the rotor 20
Movement of the striking blade 1 at the start of rotation of
The taper surface 1t of the striking blade 1 and the tapered surface 25t of the main body 25 of the holder 2 are more securely adhered to each other, and the striking blade 1 can be firmly held so as not to move in the axial direction.

[0032]

As described above, in the impact blade holding mechanism of the impact crusher according to the present invention, the impact blade is held by the tapered surface of the holder, so that the impact blade can be easily replaced, and the replacement operation can be easily performed. Work load can be reduced and work time can be shortened, and work efficiency can be increased. Further, since the holding of the impact blade is stabilized, the crushing efficiency is improved. Further, the provision of the guide pins increases the stability of the holding of the hitting blade, thereby improving the crushing efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of a rotor of an impact crusher according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an arrangement of a disk plate of a rotor.

FIG. 3 is an explanatory view of a striking blade holding structure.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a sectional view taken along line DD of FIG. 4 in a state where the rotor is rotating.

FIG. 7 is a sectional view taken along line DD of FIG. 4 in a state where the rotor is stopped.

FIG. 8 is a view taken along line EE of FIG. 4;

FIG. 9 is an explanatory diagram of the overall configuration of a conventional impact crusher.

FIG. 10 is an explanatory view of an arrangement of a disk plate of a rotor of a conventional impact type crusher.

FIG. 11 is an explanatory view of a hitting blade holding structure of a conventional impact type crusher.

FIG. 12 is an explanatory view of a replacement operation of a hitting blade of a conventional impact type crusher.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 impact blade 1 s side surface 1 t tapered surface 2 holder 3 disk plate 4 rotor shaft 5 holding groove 5 a convex portion 6 pin 6 a washer 6 b split pin 7 bolt 7 a embedded nut 8 guide pin 10 impact crusher 11 long hole 20 rotor 21 bearing Reference Signs List 22 pulley 25 main body 25a recess 25t tapered surface 26 connecting portion 27 pin hole 30 casing 31 repulsion plate 32 hydraulic cylinder I inlet M raw material O outlet P product

Claims (2)

(57) [Claims] 1. A plurality of holding grooves are provided at equal intervals on the outer periphery of a plurality of disk plates provided at predetermined intervals on a rotor shaft so that the phases of the disk plates coincide with each other. A striking blade holding structure for an impact crusher that holds a striking blade via holders mounted on both sides, wherein the holder has a main body having a concave portion fitted with a convex portion of a holding groove of an adjacent disk plate, The main body of the holder is provided with a tapered surface on the center side of the holding groove, in which the distance between the opposed holders decreases as going outward in the radial direction. Is provided with a pin hole, and the striking blade is provided with a tapered surface so as to abut against the tapered surface of the body portion of the holder facing each other. An impact-type crusher characterized in that a pin for limiting the drop of the impact blade and the axial movement of the impact blade when the rotation of the rotor is stopped is inserted into the pin hole of the connection portion and the long hole of the impact blade. Striking blade holding structure. 2. A guide portion is formed on a side surface of a taper surface of a striking blade, and the striking blade abuts on the taper surface of the main body portion of the holder when the striking blade moves radially with the rotation of the rotor. 2. A striking blade holding structure for an impact crusher according to claim 1, further comprising a guide pin for guiding the crusher in parallel.