JP2901712B2 - Roller type crusher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher, and more particularly, to a roller-type crusher suitable for reducing vibration and stress generated during crushing.

[Conventional technology]

FIG. 7 is an overall view of the roller-type pulverizer, FIG. 8 is a side view of the roller-type pulverizer, and FIG. 9 is a cross-sectional view of the roller-type pulverizer. The yoke 10 is rotatably mounted on the output shaft of the reduction gear 11.
Is fixed with a crushing ring 1. A plurality of rollers 2 fixed to a roller bracket 3 so as to be rotatable by a shaft 5 and a bearing are placed in an annular groove (recess) on the outer periphery of the upper surface of the crushing ring 1. The upper portion of the roller bracket 3 and the pressure frame 7 are formed with grooves into which the pins 4 can be inserted.
, And is pressed against the crushing ring 1 by the pressure frame 7 so that the roller 2 does not fall. A plurality of springs 8 are mounted on the pressure frame 7,
The spring 8 is fixed to a spring frame 9. The spring frame 9 is connected to a pressurizing cylinder 17 via a pivot arm 12 and a loading rod 13 shown in FIG. A mill housing 18 is provided to accommodate most of these devices.

When the input shaft of the reduction gear 11 is rotated by the motor, the yoke 10 attached to the output shaft of the reduction gear 11 and the grinding ring 1 fixed to the yoke 10 rotate. At this time, the pressure cylinder 17 is pulling the loading rod 13, and this pulling force presses the spring frame 9 downward through the pivot arm 12, and the spring frame 9 presses the spring 8, the pressure frame 7, the pin 4, The roller 2 is pressed against the crushing ring 1 via the roller bracket 3. Therefore, the roller rotates by contact friction with the grinding ring. An object to be pulverized (for example, coal) is dropped from a supply pipe 14 at the upper center, is sandwiched between the roller 2 and the pulverizing ring 1, and is pulverized by a crushing action. The pulverized material (for example, pulverized coal) is blown up by hot air, passes through a classifier 15, and has a predetermined particle size to an outlet pipe 16, and a material having a larger particle size is classified by a classifier 15 and pulverized. It falls into the part and is structured to be crushed again.

[Problems to be solved by the invention]

At the time of pulverization, the material to be pulverized (for example, coal) enters between the roller 2 and the pulverizing ring 1 and is crushed, so that the impact at this time causes the roller 2 and the roller bracket 3 to move as shown by arrows in FIG. Vibrates in the vertical direction (A) and the horizontal direction (B). As shown in FIGS. 8 and 9, the conventional roller-type pulverizer can absorb a vertical vibration by a spring 8. The lateral vibration is caused by the roller 2 and the roller bracket 3 around the pin 4 (the fulcrum).
By freely rotating and swinging (moving), the device is devised to reduce vibration.

However, in the conventional roller-type pulverizer, the roller 2 and the roller bracket 3 have large lateral deflection due to uneven wear of the roller 2 and the pulverizing ring 1 and an impact when the object to be pulverized is crushed. In order to get over the ring 1, it moves in the ring groove in the outer peripheral direction. At this time, there is a problem that excessive stress is generated in the roller 2, the roller bracket 3, and the crushing ring 1, and a large vibration is generated in the crushing device. When the roller 2 tries to get over the crushing ring 1, since it cannot structurally get over, a large load is generated between the roller 2 and the crushing ring 1, and the roller 2, the crushing ring 1, and the roller bracket 3 are excessively large. Stresses are created, reducing the life of these components. In addition, the roller 2 trying to get over the crushing ring 1 tries to return to the original position by the reaction,
At this time, large vibrations are generated in the crushing section and the entire crushing device, shortening the life of the crushing device and causing noise. Since the rotational peripheral speeds are different between the inner peripheral side and the outer peripheral side in the ring groove, when the roller moves in and out, a relative difference in the rotational peripheral velocity occurs between the roller and the pulverizing ring. The inventors thought that slip vibration might occur in the air, and confirmed this through experiments.

A roller bracket 3 is provided to provide a stopper for limiting the lateral run-out of the roller 2 and to eliminate the run-out.
It is conceivable that the connection between the pressure frame 7 and the pressure frame 7 is fixed connection instead of pin connection. However, in this case, it is not possible to absorb a horizontal shock at the time of pulverization, and excessive stress or vibration is applied to the pulverization part. Will occur. Also, by making the curvature of the concave portion of the crushing ring 1 and the curvature of the roller 2 substantially equal to each other, it is conceivable to prevent the roller 2 from oscillating in the lateral direction. Since there is no gap into which the particles enter, the crushing efficiency is greatly reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roller-type pulverizer in which the lateral deflection of a roller during pulverization is reduced and the stress and vibration of a pulverizing unit are reduced.

[Means for solving the problem]

The above object is attained by inclining the mounting shaft of the roller bracket and the pressure frame so that the distance between the pin and the grinding ring is longer on the downstream side in the rotation direction of the grinding ring than on the upstream side. Is done. That is, the problem of the prior art is that a crushing ring that rotates in a horizontal plane at the lower portion inside the mill housing, a roller disposed in the annular groove on the upper surface of the ring, a roller bracket that rotatably supports the roller, a roller bracket, In a roller-type crushing apparatus having a pressing frame that presses a roller into a crushing ring groove in a pressurized state via a roller bracket that is joined, an axis of a joint between the pressing frame and the roller bracket is positioned relative to an upper surface of the crushing ring. A roller-type pulverizing apparatus characterized in that the downstream side in the rotational direction of the pulverizing ring is higher than the upstream side, and a pulverizing ring rotating in a horizontal plane below the inside of the mill housing; Roller, a roller bracket rotatably supporting the roller with a rotating shaft, and a roller joined to the roller bracket. In a roller-type crusher having a pressurizing frame for pressing a roller into a crushing ring groove in a pressurized state via a roller bracket, a joining portion that rotatably joins the roller bracket and the pressing frame via a pin is provided. Provided a plurality, the distance between the horizontal surface and the respective joints passing through the roller rotation axis, so that the downstream side in the rotation direction of the crushing ring is sequentially longer than the upstream side,
The problem is solved by a roller-type crusher characterized by being different.

[Action]

By inclining the mounting axis of the roller bracket and the pressure frame, the rotation radius of the roller and the roller bracket centering on the pin differs depending on the position, so that the roller and the roller bracket swing in the radial direction of the grinding ring and rotate about the pin. Then, since the roller is inclined in the direction to return to the original position, a restoring force is exerted, so that the roller and the roller bracket are largely shaken, and no excessive stress or vibration is generated in the crushing portion.

〔Example〕

FIG. 1 is a side view of a pulverizing section of the roller pulverizer according to the present invention, and FIG. 2 is a sectional view of a pulverizer of the roller pulverizer according to the present invention. A roller 2 rotatably supported on a roller bracket 3 by a shaft 5 and a bearing is placed in an outer circumferential groove (recess) on the crushing ring 1. At the upper part of the roller bracket 3, a groove for receiving a pin 4 for attaching the roller bracket 3 to the pressure frame 7 is formed. Further, a roller bracket mounting base 6 in which a groove for receiving the pin 4 is machined is mounted on the pressing frame 7. When the roller bracket 3 is mounted on the pressure frame 7 via the pin 4, the distance between the pin 4 a and the crush ring 1
It is longer than the distance from 4b to the crushing ring 1, and the axis of attachment of the roller bracket 3 to the pressure frame 7 is inclined (angle α) with respect to the crushing ring 1. The roller bracket 3 and the roller 2 are pressed against the crushing ring 1 by the pressing frame 7 via the pin 4, and a plurality of these rollers are arranged in the groove on the upper surface of the crushing ring so as not to fall. A spring 8 is attached to the pressure frame 7, and the spring 8 is fixed to a spring frame 9. Spring frame 9
Is a pressure cylinder (1 in FIG. 7) via a pivot arm (12 in FIG. 7) and a loading rod (13 in FIG. 7).
7) is connected.

In the roller type crushing apparatus according to the present invention, as shown in FIG. 1, the contact point A between the roller 2 and the crushing ring 1 and the vertical line dropped to the crushing ring 1 at the point C which is the rotation center of the roller bracket 3 and the roller 2. Is separated from the point B by a length L. Assuming that the distance between the point C and the point D which is the center of the roller 2 is r _CD , the length L is represented by L = r _CD × Sin α, and the length L increases as the angle α increases. In the conventional roller-type pulverizer shown in FIG. 8, points A and B coincide with each other.
L = 0.

At the time of pulverization, the pulverizing ring 1 rotates, and accordingly, the roller 2 is fixedly rotated on the pulverizing ring 1. When the roller 2 swings in the laterally outward direction (B) as shown by an arrow in FIG. 9 due to an impact when the object to be crushed is crushed between the roller 2 and the crushing ring 1, the roller 2 and the roller The bracket 3 attempts to rotate about the pin 4. At this time, as shown in FIG.
Rotation radius r _E around the rotation radius r _F becomes around the pin 4b of the point F, the rotation radius of the roller 2 about the pin 4 becomes r _E> r _F. The roller 2 and the roller bracket 3 swing radially outward as shown in FIG.
When the roller 2 is rotated outward by an angle θ about the centers (fulcrums) a and 4b, the points E and F of the roller 2 in FIG. 3 move outward. Assuming that the movement amounts of the points E and F at this time are l _E and l _F , respectively, l _E and l _F are the rotation angle θ and the rotation radius.
Using r _E and r _F , it can be obtained by l _E = r _E θ and l _F = r _F θ. Turning radius is r _E> r _F, since the rotation angle θ of the E point and F point of the same, the amount of movement of the point E and point F l _E>
l _F Therefore, as shown in FIG.
Point _E moves by a distance l _{E to} point E ', and point F moves by a distance l _{E to} point F'. Since l _E > l _F , the roller 2 faces inward with respect to the tangential direction of the crushing ring 1.
Since the point F ′, which is about to enter the contact rotation with the crushing ring, faces inward, the roller moves to the inner peripheral side of the crushing ring groove as it rotates, and attempts to return to the original position.
Further, since the roller 2 is stationary rotating on the crushing ring 1 with the rotation of the crushing ring 1, a frictional force F between the crushing ring 1 and the roller 2 is generated on the roller 2 as shown in FIG. ing. The roller 2 is facing the inner, as the frictional force F Figure 5, the force F ₁ to be Korogaso the roller 2 in the rotation direction of the roller 2 (E'F 'direction), the roller 2 the can be decomposed into a force F ₂ that attempts to return to its original position. This F
₂ is the roller 2 and roller bracket 3
The roller 2 and the roller bracket 3 swinging outward try to return to their original positions.
FIG. 5 shows that this restoring force increases as the roller 2 faces inward. That is, point E of roller 2 and F
The greater the difference l _E −l _{F in the} amount of movement to the outside of the point, the greater the restoring force. The difference l _E −l _F between the movement amounts of the points E and F is r _E θ−
r _F θ = (r _E −r _F ) θ
The larger the rotation angle θ about 4a and 4b, that is, the more the roller 2 moves outward, the more the roller 2 faces inward, and the greater the restoring force. Also, as the tilt angle of the roller bracket 3 alpha is large as can be seen from Figure 3, r _E
−r _F increases. Therefore, the larger the inclination angle α is,
l _E −l _F increases and the restoring force increases. The above is the case where the roller 2 and the roller bracket 3 sway radially outward. However, even when the roller 2 and the roller bracket 3 sway radially inward, the outward restoring force acts for exactly the same reason. Of course. In the conventional roller-type pulverizer, even if the roller 2 and the roller bracket 3 swing outward, the roller 2 does not face inward, so that F ₂ = 0 and no restoring force is generated.

As described above, in the roller type crusher according to the present invention,
Even when the roller 2 oscillates in the lateral direction due to uneven wear of the roller 2 and the crushing ring 1 or an impact at the time of crushing the object to be crushed, the direction of the roller 2 changes in proportion to the magnitude of the sway,
As a result, a restoring force is generated, so that the roller 2 attempts to quickly return to the original position. For this reason, the phenomenon that excessive stress or large vibration is generated in the crushing portion does not occur when the roller 2 tries to get over the crushing ring 1 due to large lateral deflection of the roller 2, and the stress or vibration generated in the crushing portion is greatly reduced. Can be reduced to

Another embodiment of the present invention is shown in FIG. In the embodiment shown in FIG. 1, the mounting shaft of the roller bracket 3 is tilted by mounting the roller bracket mounting base 6 on the pressing frame 7, but in the embodiment shown in FIG. Is changed, the mounting axis of the roller bracket 3 is inclined. The effect of the embodiment of FIG. 6 is exactly the same as that of the embodiment of FIG.

〔The invention's effect〕

According to the present invention, the roller, even when the roller oscillates laterally due to uneven wear of the crushing ring or impact during crushing, the direction of the roller changes in proportion to the magnitude of the sway,
Since the restoring force occurs with this and the roller tries to return to the original position, the lateral deflection of the roller can be significantly reduced,
Accordingly, there is an effect that the stress and vibration of the crushing section can be significantly reduced.

[Brief description of the drawings]

1 and 3 are side views showing one embodiment of the pulverizing apparatus according to the present invention, FIG. 2 is a cross-sectional view showing one embodiment of the pulverizing apparatus according to the present invention, and FIGS. The figure is a plan view showing the movement of the roller of one embodiment of the crusher according to the present invention,
FIG. 6 is a side view showing another embodiment of the crusher according to the present invention, FIG. 7 is an overall view of a conventional roller crusher, and FIG. 8 is a crusher of the conventional roller crusher. FIG. 9 is a sectional view of a pulverizing section of a conventional roller type pulverizer. 1 ... crushing ring, 2 ... roller, 3 ... roller bracket, 4, 4a, 4b ... pin, 5 ... axis, 6, 6a, 6b ...
Roller bracket mount, 7 ... Pressure frame, 8 ...
... Spring, 9 ... Spring frame.

Claims (3)

(57) [Claims] A crushing ring rotating in a horizontal plane at a lower portion inside the mill housing; a roller disposed in an annular groove on an upper surface of the ring; a roller bracket rotatably supporting the roller; and a roller bracket joined to the roller bracket In a roller-type crusher having a pressurizing frame for pressing a roller into a crushing ring groove in a pressurized state via a crushing ring, an axis of a joint between the pressing frame and the roller bracket is rotated with respect to an upper surface of the crushing ring. A roller type pulverizing device characterized in that the downstream side in the direction is inclined higher than the upstream side. 2. A grinding ring that rotates in a horizontal plane below the mill housing, a roller disposed in an annular groove on the upper surface of the ring, a roller bracket that rotatably supports the roller by a rotation shaft, and a joining with the roller bracket. And a pressurizing frame for pressing a roller into a crushing ring groove in a pressurized state via a roller bracket, in which the roller bracket and the pressurizing frame are rotatably joined via pins. A plurality of parts are provided, and the distance between the horizontal plane passing through the roller rotation axis and each joint is made different so that the downstream side in the rotation direction of the crushing ring becomes longer sequentially than the upstream side. Roller type crusher. 3. A grinding ring that rotates in a horizontal plane at a lower portion inside the mill housing, a roller disposed in an annular groove on an upper surface of the ring, a roller bracket rotatably supporting the roller, and a roller bracket joined to the roller bracket. A pressurizing frame for pressing a roller into a crushing ring groove in a pressurized state via a crushing ring, when the roller swings in the radial direction of the crushing ring, A roller-type crusher, wherein the swing distance on the downstream side in the rotation direction is larger than the swing distance on the upstream side in the rotation direction of the crushing ring.