JPS586505Y2 - Structure of rotary blade for crusher - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement in the structure of a rotary blade for a crusher.

Conventionally, there is a type of rotary blade for a crusher that has a retractable claw blade protruding from the outer periphery of the rotary blade shank and a side blade set on both sides or one side of the shank. The provided retractable claw blade is
The structure is such that the top blade is fixed by welding or bolts to the front side of the retractable pawl that protrudes from a part of the outer periphery of the shank itself in the direction of rotation. Because it is exposed on both sides, when the retractable claw blade forcibly bites into a foreign or oversized object when crushing garbage or waste, it will receive a shock load. There were drawbacks such as cracking and chipping, and the top blade's mounting bolts were damaged, causing the blade to fall off.

This invention aims to improve the above-mentioned conventional drawbacks and provide a rotary blade for a crusher that can prevent cracking and chipping of the top blade. In a rotary blade in which a top blade is attached to the front surface of the protruding side of the retractable pawl on the side preceding the rotating direction, both sides of the top blade are surrounded by both side walls of the retractable pawl.

Hereinafter, embodiments of this invention will be described based on the drawings.

Figure 1 shows an example of a crusher to which this devised rotary blade is applied. 1 is a crusher main body, in which a crushing chamber 2 is formed, an input port 3 is provided at the top of the crushing chamber 2, and an input port 3 is provided at the bottom of the crushing chamber 2. outlet 4
Each is open.

In the crushing chamber 2, a pair of left and right rotary blade shafts 5, 5 are arranged so as to rotate inwardly as shown by arrows A and B in the figure.

The rotary blade 6 of this invention is set on the rotary blade shafts 5, 5.

A rotary shank 7 and a spacer 8 are alternately fitted in the rotary blade shafts 5, 5 in the axial direction, respectively.

As shown in FIGS. 2 to 4, the rotary blade shank 7 has retracting claws 9 integrally formed in a protruding manner on the outer periphery (three in the example shown), and ring plates on both sides or one side in the circumferential direction. A side blade 10 that is divided into four parts (in the illustrated example) is set with bolts 11.

The shanks 7 on one shaft 5 and the shanks 7 on the other shaft 5 are assembled so as to mesh with each other, and the side blades 10 and 10 set on both shanks 7 are opposed to each other and close to each other, and their outer peripheral edges 10a , 10a so that a continuous shearing force acts between them.

The retractable claw portion 9 integrally protrudes from the outer periphery of the rotary blade shank 7, and the both side walls ga are extended in the axial direction so that they become the side surfaces of the side blade 10 and the road surface, and the radial portion of the shank 7 forms a T-shape. A recess 12 is formed in the cross section and is closed on both sides by side walls 9a, 9a, and is open at the front and top on the front surface on the side that precedes in the rotational direction.

A generally rectangular top blade 13 is fitted into the recess 12 of the retractable claw portion 9, and both side surfaces 13 a of the blade 13 are connected to both side walls 9 a of the retractable claw portion 9 .
It becomes surrounded by 9a.

In the illustrated example, the top blade 13 is detachably set with a cap bolt 14 inserted from the rear surface of the retractable claw part 9 to enable overlay repair or replacement. Each of the bolt holes 15 and 16 is opened in a penetrating manner in the front-rear direction.

The top blade 13 and the side blades 10 are made of hardened wear-resistant steel (special steel), and the rotary blade shank 7 and the retractable claw portion 9 thereof are made of soft steel that is strong against impact forces and rich in toughness.

The crushing chamber 2 is equipped with rotary scrapers 17, 17 corresponding to the rotary blades 6, 6, and a particle size adjustment screen 18.

The rotary scraper 17 has a scrape portion 19 protruding from its outer periphery, and is arranged in a row on a scraper shaft 20 arranged parallel to the rotary blade shaft 5 with a spacer 21 in between.

And this scraper 17 has a coaxial 5
The rotary blade 6 is arranged so that it faces in an interlocking manner between the adjacent rotary blades 6 and 6 at the top.
The rotary blade 6 rotates in the same direction as the rotary blade 6, and the peripheral speed is higher than that of the rotary blade 6.

This rotary scraper 17 is made of impact-resistant mild steel like the rotary blade shank 7, but the tip of the scrape part 19 that closely opposes the outer periphery of the spacer 8 on the rotary blade shaft 5 is made of wear-resistant hardened steel. A blade 22 is attached.

The blade 22 is the top blade 13 of the rotary blade 6.
A blade having the same size, shape, and material as the top blade 13 is used so that the top blade 13 can be used in common.

The attachment structure of the blade 22 to the scrape portion 19 is also the same as the attachment structure of the top blade 13 to the retractable claw portion 9, that is, the recess 23 is formed on the front surface of the scrape portion 19 on the side leading in the rotational direction. The blade 22 is fitted into this recess 23 and the bolt 24 is tightened.
The blade 22 is set in such a manner that both sides of the blade 22 are surrounded by both side walls 19 a of the scrape portion 19 .

The particle size adjusting screen 18 is installed in the crushing chamber 2 in a C-shape that surrounds the bottom of the rotary blades 6, 6 and the bottoms of the rotary scrapers 17, 17 disposed on both sides thereof. The perforated type shown in the figure may be used instead of a large number of rolls.

According to the crusher configured in this way, when the material to be crushed is supplied from the input port 3, the retracting claws 9 of the pair of rotary blades 6, 6
, 9 and are continuously crushed by the shearing force acting between the side blades 10 and 10, and the crushed material whose particle size is less than the opening of the screen 18 falls into the discharge port 4 and is discharged.
The material to be crushed with a particle size larger than the opening is screened by the retracting claw part 9.
At the same time, when the scraping portion 19 of the rotary scraper 17 peels off the material to be crushed that adheres to the rotary blade 6 from the rotary blade 6, the scraped material scraped up on both sides is removed from the rotary blade 6. The crushed material is supplied to the rotary blade 6 and is crushed again.

During this crushing, foreign matter or oversized matter may be mixed in, and in this case, the shank 7 of the rotary blade 6 will receive a shock load, which may cause the retractable claw portion 9, especially both sides of the top blade 13, to break. , both sides 13a of the top blade 13, which tend to cause chipping.
13a is surrounded by both side walls 9a, 9a which are integral with the rotary blade shank 7 made of light steel which has high toughness and is capable of absorbing and mitigating shock, so the shock load is exclusively borne by the rotary blade shank 7 and Cracking and chipping of the wall 9a can be avoided as much as possible, and the top blade 13, which is made of hardened steel and is prone to cracking and chipping due to impact, can be sufficiently protected from impact, and cracking and chipping can be prevented. .

Further, although the top blade 13 is attached with a bolt 14, there is almost no risk of the bolt being damaged and the top blade 13 falling off due to this.

To protect the top blade 13 from shock loads and prevent it from falling off, the blade 2 of the rotary scraper 17 has the same mounting structure as the top blade 13.
The same thing can be said about 2.

Further, since the blade 22 of this scraper 17 is made of the same material, size, and shape as the top blade 13, it can be used in common with the top blade 13, which is extremely advantageous in terms of processing and cost.

Note that although the crusher of the above embodiment is equipped with a screen 18, this screen 18 is not necessarily required.

As described above, in this device, both sides of the top blade 13 attached to the front surface of the retractable claw portion 9 of the rotary blade 6 are surrounded by the retractable claw side wall 9a that is integrated with the rotary blade shank 7. Or, the shock load when crushing an oversized object is exclusively received by the rotary blade shank 7, and the top blade 1
3 has the advantage that it is effectively protected without cracking, chipping, or falling off, and its durability is significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of a crusher to which this invented rotary blade is applied, Fig. 2 is a side view showing the rotary blade partially cut away, and Fig. 3 is a retractable claw shown in Fig. 2. FIG. 4 is a front view showing the rotary blade partially cut away. 6...Rotary blade, 7...Rotary blade shank, 9...Retractable claw portion, 9a...Side wall of the retractable claw portion, 13... ...Top blade.

Claims (1)

[Scope of utility model registration request] A rotary blade in which a retractable claw part is integrally provided on the outer periphery of the rotary blade shank, and a top blade is attached to the front surface of the leading side of the retractable claw part in the rotational direction, and both sides of the top blade are attached to the retractable claw part. A rotary blade structure for a crusher characterized by being surrounded by both side walls.