JP6779009B2 - Maintenance management method for roller journal protector, crushing roller unit and crusher, and roller journal protector - Google Patents

Description

The present invention relates to a roller journal protector that protects a roller journal equipped in a crusher that crushes and pulverizes solids such as carbon-containing solid fuel such as coal, a crushing roller unit provided with this roller journal protector, and the like. The present invention relates to a crusher equipped with a crushing roller unit and a maintenance management method for a roller journal protector.

Conventionally, a pulverized coal combustion device such as a thermal power generation boiler using pulverized coal obtained by pulverizing a carbon-containing solid fuel such as coal into fine powder using a crusher (mill) is known. Such a crusher crushes the raw coal sent from the coal feeder by pressing it with a crushing roller and a crushing table (manufacturing pulverized coal), and blows out pulverized powder from a gap between the crushing table and the casing (housing). Utilizing the flow of transport gas (air or inert gas) used for transporting charcoal, the charcoal is transported from inside the crusher to the boiler side via a fuel supply pipe (see Patent Documents 1 and 2).

Inside such a crusher, fine powder such as pulverized coal is blown up by the flow of the transport gas (air or inert gas). Patent Document 1 describes a technique for preventing the blown-up fine powder from leaking to the outside from a hole in a casing (housing) through which a crushing roller penetrates. Patent Document 2 describes a technique for preventing the blown-up pulverized coal from being clogged between the labyrinth seals that block the shaft holding portion of the crushing roller.

JP-A-2002-224581 Japanese Unexamined Patent Publication No. 2011-92849

By the way, a part of the fine powder blown up by the flow of the conveyed gas collides with a part of the roller and the journal (roller journal) such as the shaft-shaped part of the crushing roller and the roller support part supporting the crushing roller. Countermeasures against wear in these areas have become an issue.

On the other hand, it is possible to take measures to suppress wear by directly attaching a plurality of wear-resistant steel plates directly to the base material at a place where wear occurs on the surface of the base material. However, in this case, when replacing a plurality of worn wear-resistant steel plates, the wear-resistant steel plates are manually replaced so as not to damage the base material, resulting in poor workability and re-grinding of the crusher. It takes time to operate, which may greatly reduce the operating rate of the crusher, and when the steel plate is peeled off, a part of the surface of the base metal may be peeled off together to damage the base metal.

The present invention was devised in view of such a problem. It prevents the collision of fine powder with the roller journal to suppress the occurrence of wear, and has good workability for the maintenance of the roller journal, and is a base material. It is an object of the present invention to provide a roller journal protector, a crushing roller unit and a crusher, and a maintenance management method for the roller journal protector, which can reduce the risk of damaging the roller journal.

(1) In order to achieve the above object, the roller journal protector of the present invention is arranged in an opening formed in the peripheral wall of the housing of the crusher, and is swingably supported by the swing shaft on the peripheral wall. It is attached via a journal head and a roller journal portion having a shaft-shaped portion rotatably supported by the roller support portion of the journal head, and is brought into contact with the upper surface of a crushing table rotating in the housing. A crushing roller unit including a crushing roller having a roller main body for crushing solid matter into fine powder, and a transport gas outlet for blowing out the transport gas upward in the vertical direction of the shaft-shaped portion. A protector that protects the roller journal portion from the collision of the fine powder transported together with the transport gas, and the outer periphery of the shaft-shaped portion is directed from the roller support portion toward the roller main body portion. The diameter of the mounting panel member to be attached to the journal head is increased , and the diameter is increased from the base end portion to the tip end portion according to the shape of the outer periphery of the shaft-shaped portion to extend the lower portion of the shaft-shaped portion in the vertical direction. It is formed in a semi-pyramidal shape that surrounds it, the base end portion is fixed to the mounting panel member, the tip end portion extends toward the roller body portion side, and the transport gas from the transport gas outlet It has a shield that covers the contact portion and protects it from the collision of the fine powder, and the inner surface of the shield in the vertically lower region of the semi-pyramidal shape when the shield is attached is from the base end portion to the tip end portion. It is characterized in that it is formed so as to incline downward from the horizontal plane at an angle equal to or higher than the rest angle of the fine powder toward the portion.

(2 ) It is preferable that the shield is formed in the semi-frustum shape by connecting a plurality of flat plates.
( 3 ) It is preferable that a hard tile that protects the shield from collision of the fine powder is mounted on the surface of the shield on the side where the transport gas hits from the transport gas outlet.

( 4 ) The mounting panel member is arranged so as to close a part of the opening below the roller support portion in the vertical direction, and the roller journal portion and at least a part of the swing shaft collide with the fine powder. It is preferable to protect from.

( 5 ) The mounting panel member has a semicircular shape formed in a portion that is vertically upward at the time of mounting according to the outer peripheral shape of the lower half of the roller support portion and is arranged along the outer peripheral shape of the lower half. The base end portion of the shield is provided with a concave edge portion, and the base end portion of the shield is fixed close to the concave edge portion and is located below the shield in the vertical direction at the time of mounting, and is on the side where the transport gas from the transport gas outlet hits. It is preferable that the surface is equipped with hard tiles that protect the mounting panel member from collision with the fine powder.

( 6 ) The mounting panel member includes a lateral region extending downward in the width direction and the vertical direction of the opening from each side of the outer circumference of the lower half portion of the roller support portion at the time of mounting, and the roller support portion at the time of mounting. It has a lower region extending vertically downward on the outer periphery of the lower half portion, and the hard tile is preferably mounted on at least a part of the lower region.

( 7 ) A mounting seat is formed on the back surface of the mounting panel member opposite to the front surface of the mounting panel member on the side opposite to the front surface of the transport gas outlet, and the seat surface formed on the roller support portion and the mounting seat. removably attached by the fastening bolt and, around the bolt hole of the mounting seat, it is preferable that the protective wall that protects the head of the fastening bolt from the collision of the fine powder is formed.
(8) The angle at which the rotation axis of the crushing roller is tilted downward toward the crushing table is 15 to 40 °, and the angle at which the inner surface of the shield is tilted downward in the vertically downward region of the semi-frustum shape. Is preferably greater than 40 °.

(9) The crushing roller unit of the present invention is arranged in an opening formed in the peripheral wall of the housing of the crusher, and is swingably supported by the peripheral wall by a swinging shaft, and a journal head and a roller of the journal head. It is attached to the support portion via a roller journal portion having a shaft-shaped portion, and has a roller body portion that comes into contact with the upper surface of a crushing table that rotates in the housing and rolls around to pulverize a solid substance into fine powder. A crushing roller unit comprising a crushing roller and a transport gas outlet for blowing out the transport gas upward in the vertical direction of the shaft-shaped portion, wherein the front roller journal portion has the above-mentioned ( It is characterized in that the roller journal protector according to any one of 1) to (8) is attached.

(10) The crusher of the present invention is characterized by having a crushing table that is driven and rotatably supported around an axis along the vertical direction in a housing, and a crushing roller unit according to the above (9). There is.

(11) The maintenance management method of the roller journal protector of the present invention is the maintenance management method of the roller journal protector according to any one of (1) to (8) above, and is carried out at the inspection timing of the crusher. When the state determination step of checking the state of the roller journal protector and determining whether or not the replacement is a preferable wear state and the state determination step determine that the state of the roller journal protector is a wear state, the roller It is characterized by having a replacement process for replacing the journal protector with an appropriate product prepared in advance.
(12) If it is determined in the state determination step that the roller journal protector has been removed, it is determined whether or not the roller journal protector is in a repairable and reproducible state, and if it can be repaired and regenerated. It is preferable to carry out repair and regeneration treatment as the appropriate product that can be replaced in the next replacement step to prepare in advance.

According to the present invention, since the shield covers the portion where the transport gas (air or inert gas) collides with the shaft-shaped portion of the roller journal portion of the crushing roller, the fine powder blown up by the flow of the transport gas. It is possible to suppress the occurrence of wear of the shaft-shaped portion due to the collision of the body. In addition, since the roller journal protector can be easily attached to and detached from the journal head by the mounting panel member, the workability related to the maintenance of the journal head is good, and the period until the crusher is restarted due to the work related to the maintenance is shortened. It is possible to suppress a decrease in the operating rate of the crusher and reduce the risk of damaging the base metal during the replacement work.

Further, the mounting panel member of the roller journal protector is configured as an apron-shaped panel arranged so as to close a part of the opening of the peripheral wall of the housing below the roller support portion in the vertical direction, and the roller journal portion is formed by the apron-shaped panel. By closing the roller support portion and the swing shaft, it is possible to suppress the occurrence of wear of the roller support portion and the swing shaft due to the collision of the fine powder blown up by the flow of the conveyed gas. In addition, in the mounting panel member (apron-shaped panel), by providing a wear-resistant material such as a wear-resistant steel plate on the part where the fine powder collides, the wear-resistant material is improved, and the work related to the maintenance of the journal head. The frequency of replacement can be reduced and replacement work can be facilitated. In addition, it is possible to reduce the risk of damaging the base material by the work.

It is a perspective view which shows a part of the structure of the inside of the crusher provided with the crushing roller unit with the roller journal protector which concerns on one Embodiment of this invention. It is sectional drawing which shows the main part structure of the crusher provided with the crushing roller unit with the roller journal protector which concerns on one Embodiment of this invention. It is a figure which shows the side surface of the crushing roller unit with the roller journal protector which concerns on one Embodiment of this invention, (a) is the whole sectional view, (b) is the main part side view. It is a perspective view which shows the state seen from the oblique front side of the crushing roller unit with the roller journal protector which concerns on one Embodiment of this invention. It is a perspective view which shows the main part seen from the oblique front side by removing the crushing roller of the crushing roller unit with the roller journal protector which concerns on one Embodiment of this invention. It is a perspective view which shows the state seen from the lower back side of the crushing roller unit with the roller journal protector which concerns on one Embodiment of this invention, (a) is the whole perspective view, (b) is the squint of the main part. FIG. 6 is an enlarged view of the VIB portion of FIG. 6A. It is a front view of the apron-shaped panel (mounting panel member) of the roller journal protector which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
It should be noted that the embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the following embodiments can be variously modified and implemented without departing from the purpose thereof, and can be selected as necessary or combined as appropriate.

Further, the crushing roller unit provided with the roller journal protector and the crushing machine provided with the crushing roller unit according to the present invention are for crushing and pulverizing solid raw materials, and typical ones are solids. As a raw material, there is a coal crusher that crushes and pulverizes carbon-containing solid fuel such as coal. As the raw material for the solid material to be crushed, various solid materials such as biomass and petrocork, which is the residue of crude oil, can be applied.
In addition, "up and down" described below means up and down in the vertical direction (gravitational direction), and "left and right" means directions in opposite directions in the horizontal direction with respect to a certain subject.

[Composition of crusher]
First, the configuration of the crusher 10 according to the present embodiment will be described with reference to FIG. As shown in FIG. 2, the crusher 10 also called a vertical mill includes a housing 11 having a vertical cylindrical hollow shape, and a solid such as coal to be crushed is placed on the central axis of the ceiling portion 11a of the housing 11. An input pipe 14 for inputting raw materials is arranged. A crushing table 13 for crushing the solid material raw material charged from the charging pipe 14 is arranged on the pedestal 12 directly below the charging pipe 14. The crushing table 13 is rotationally driven around the axis in the vertical direction along the central axis by a driving device (not shown).

An annular crushing surface 13a is formed concentrically with the central axis on the upper surface of the crushing table 13 in the vertical direction, and a plurality (for example, two or three) facing the crushing surface 13a above the crushing surface 13a in the vertical direction. ), The crushing rollers 21 are arranged at equal intervals in the circumferential direction. Each crushing roller 21 is rotatably supported by the tip of a journal shaft (rotational support shaft) 22 arranged so as to incline downward in the vertical direction from the peripheral wall 11b of the housing 11 toward the central axis side.

The journal shaft 22 is supported by the journal head 23, and the crushing roller unit 20 is composed of the crushing roller 21, the journal shaft 22, and the journal head 23. The journal head 23 is provided with a swing shaft (pivot pin) 24 extending in the tangential direction of the outer circumference of the crushing table 13 protruding from the housing 11 to the left and right (one and the other in the tangential direction). The crushing roller unit 20 is swingably supported by the peripheral wall 11b via the pivot pin 24 in a direction approaching the crushing surface 13a and a direction away from the crushing surface 13a.

As shown in FIG. 2, the journal head 23 is formed with a protrusion 23a projecting downward in the vertical direction, and the peripheral wall 11b of the housing 11 is equipped with a stopper 25. When the tip of the stopper 25 comes into contact with the protrusion 23a, the approach of the crushing roller 21 to the crushing surface 13a is restricted. The tip position of the stopper 25 is adjusted by being driven forward and backward by the actuator 26, and the closest position of the crushing roller 21 to the crushing surface 13a is adjusted.

Further, the crushing roller 21 is equipped with an urging device 27 that applies a load for crushing the solid matter. The urging device 27 includes a hydraulic cylinder 28 fixed to the peripheral wall 11b and a plunger 29 driven axially by the hydraulic cylinder 28. An arm portion 23b extends from the upper portion of the journal head 23, and the tip of the plunger 29 is pressed against the arm portion 23b so that the crushing roller 21 crushes the solid matter on the crushing surface 13a downward (facing the crushing surface 13a). ) A load is applied.

At the lower part of the housing 11, an inlet port 15 located around the outside of the crushing table 13 to which the conveyed gas is sent is provided. In the present embodiment, air compressed by a primary blower (not shown) is sent into the housing 11 as a transport gas from the inlet port 15, and the inside of the housing 11 has a high pressure atmosphere.

A rotary separator (classification device) 17 for classifying crushed solid matter (hereinafter, also referred to as fine powder or crushed matter) by a classification blade 16 is provided on the upper portion of the housing 11 located around the outer periphery of the input pipe 14. Be done. Further, the ceiling portion 11a of the housing 11 is provided with an outlet port 18 for discharging the classified crushed material.

The solid matter crushed by the crushing roller 21 becomes a crushed material, and by driving a blower (not shown) connected to the inlet port 15, the transport gas is sent from the inlet port 15 into the housing 11, and the transport gas blown described later. The upward swirling flow of the transport gas generated by the vane 32a at the outlet 32 causes the pulverized material to rise while being dried. The raised pulverized product is classified into fine-grained powder smaller than a predetermined particle size and coarse powder larger than a predetermined particle size by the rotary separator 17. At that time, the coarse powder is classified and distributed by the rotary separator 17 in order to suppress the transfer from the crusher to another device, and is returned to the crushing table 13 again for re-grinding. The fine-grained powder passes through the rotary separator 17, is discharged from the outlet port 18 along with the flow of the transport gas, and is transported from the crusher to another device.

[Structure of crushing roller unit and its surroundings]
The schematic configuration of the crushing roller unit 20 itself equipped in such a crusher 10 is almost the same as that of the conventional one. Hereinafter, description will be made with reference to FIGS. 1 and 3 (a).

As shown in FIGS. 1 and 3 (a), an opening 11c is formed in the peripheral wall 11b of the housing 11, the journal head 23 is arranged in the opening 11c, and the pivot pin 24 protruding to the left and right is opened. It is swingably supported by the peripheral wall 11b at the edge of 11c. A cover 30 projecting in the radial direction of the peripheral wall 11b is attached to the opening 11c so as not to interfere with the journal head 23, and separates the inside and the outside of the housing 11.

The crushing roller 21 has a roller housing 21a having a shaft-shaped portion 21b, and a roller main body portion 21c that is externally fitted to and detachable from the roller housing 21a. Further, the journal head 23 is provided with a roller support portion 23c that supports the crushing roller 21, and the protrusion 23a, the arm portion 23b, and the pivot pin 24 project downward, upward, and left and right side from the roller support portion 23c. The stopper 25, the plunger 29, and the peripheral wall 11b are contacted and supported, respectively.

Further, the end portion (one end side) of the journal shaft 22 on the cover 30 side is coupled to the roller support portion 23c of the journal head 23. The roller housing 21a of the crushing roller 21 is rotatably attached to the end (other end side) of the journal shaft 22 on the central axis side. The axis of the journal shaft 22 is arranged so as to incline downward from the peripheral wall 11b of the housing 11 toward the central axis side, and the inclination angle α is, for example, about 15 to 40 degrees.

The conveyed gas sent into the housing 11 by the blower (not shown) connected to the inlet port 15 is between the outer periphery of the crushing table 13 and the peripheral wall 11b of the housing 11 as shown by the arrow A1 in FIG. 3A. The air is blown upward in the vertical direction from the transport gas outlet 32 provided in the housing. A vane 32a is provided at the portion of the transport gas outlet 32 on the outer periphery of the crushing table 13, and a rotational force is applied to the transport gas blown upward in the vertical direction from the transport gas outlet 32 while rotating together with the crushing table 13. In addition, a swirling flow upward in the vertical direction is formed in the housing 11.

The roller housing 21a of the crushing roller 21 and the roller support portion 23c of the journal head 23 are arranged immediately above the transport gas outlet 32, and the pivot pin 24 is also located. Therefore, the conveyed gas blown from the lower side in the vertical direction to the upper side is blown toward the roller housing 21a, the roller support portion 23c, the surface of the pivot pin 24 located downward in the vertical direction, and the like.

In the housing 11, fine powder crushed by the crushing roller 21 on the crushing table 13 is blown up by the flow of the conveyed gas, and a part of the fine powder is blown up by the flow of the conveyed gas, and a part of the fine powder is blown up by the shaft-shaped portion 21b of the roller housing 21a, the roller support portion 23c, and the pivot. It is sprayed toward a surface or the like located downward on the pin 24 and collides with it. If the fine powder collides with a surface or the like located downward of these device portions, damage such as wear of the collision portion is caused. Therefore, as a countermeasure, in the crushing roller unit 20, the roller support portion 23c of the journal head 23 and the crushing roller A roller journal protector 40 is attached to the roller journal portion 20J having the axial portion 21b of 21.

[Structure of roller journal protector]
As shown in FIG. 3B, the roller journal protector 40 has an apron-shaped panel (mounting panel member) 41 detachably attached to the roller support portion 23c and the protrusion 23a of the journal head 23, and a base end portion 42a. It has a shield 42 fixed to the apron-shaped panel 41 and arranged and attached so as to surround the lower portion of the shaft-shaped portion 21b of the roller housing 21a. The apron-shaped panel 41 and the shield 42 are made of a steel material (for example, SS400, low alloy steel, etc.).

The apron-shaped panel 41 is a flat plate and is attached to the roller support portion 23c so as to spread around the roller support portion 23c, and not only functions as an attachment member for attaching the shield 42 to the roller support portion 23c or the like. It also has a function of protecting the roller support portion 23c, the protrusion 23a, and the pivot pin 24 from the collision of fine powder.

FIG. 7 is a front view of the apron-shaped panel 41. The upper side of the paper surface is a plate-shaped member that is vertically upward in the mounted state and spreads in a plane shape in the vertical and horizontal directions of the paper surface. As shown in FIG. 7, the apron-shaped panel 41 has a concave edge portion 41a formed above the apron-shaped panel 41 in a substantially semicircular shape corresponding to the outer circumference of a substantially semi-cylindrical lower half portion of the roller support portion 23c in the vertical direction. Is formed. The apron-shaped panel 41 extends flatly from the concave edge portion 41a to both sides and downward in the horizontal direction (direction when attached to the journal head 23). The upper edges 41b, 41b and the side edges 41c, 41c located on both sides of the concave edge 41a in the horizontal direction are formed substantially linearly, and the lower edge below the concave edge 41a is a horizontal intermediate lower edge. It is formed in a bending line shape including 41d and inclined side lower edge portions 41e and 41e on both sides thereof.

In such an apron-shaped panel 41, as shown in FIGS. 4 to 7, the concave edge portion 41a is aligned with the outer circumference of the lower half portion of the roller support portion 23c, which is substantially semi-cylindrical and faces downward in the vertical direction. The plane is arranged in a direction orthogonal to the axis of the roller support 23c (the axis of the journal axis 22) so that the plane extends within a range of a substantially constant distance from the outer circumference of the roller support 23c. It is attached to 23c.

As shown in FIGS. 1, 3 to 5, the apron-shaped panel 41 is a part of the opening 11c of the peripheral wall 11b of the housing 11, that is, the horizontal direction (journal head) of the lower half of the roller support portion 23c. It is arranged and attached so as to block the regions on both sides of the (direction at the time of attachment to 23), and the lower half and the regions on both sides thereof in the vertical direction. As shown in FIG. 7, the apron-shaped panel 41 has a lateral region (mainly an upper edge portion) extending horizontally (in the width direction of the opening 11c) and downward from each side of the outer circumference of the lower half of the roller support portion 23c. 41b, side edge portion 41c, trapezoidal region surrounded by side lower edge portion 41e) 41P1, 41P1 and lower region (mainly concave edge portion 41a and intermediate lower edge) extending below the outer circumference of the lower half portion of the roller support portion 3c at the time of mounting. It can be divided into side regions 41P1 and 41P1) 41P2 which are surrounded by the portion 41d.

In the region where the collision frequency of fine powder is relatively high on the surface of the apron-shaped panel 41 (the surface on the side where the conveyed gas is sprayed), the apron-shaped panel 41 is a hard tile that suppresses the occurrence of wear due to the collision of the fine powder. As a result, a ceramic tile 43 made of hard ceramic is attached. The ceramic tile 43 has a lower region (which can also be referred to as a “region portion having a width located directly below the axis of the roller support portion 23c”) 41P2, which is a region where the collision frequency of fine powder is relatively high. It is mounted on the main body so that the gap between the ceramic tiles 43 is narrowed only on a part of the surface. The mutual gap is determined by the difference in thermal expansion between the ceramic tile 44 and the apron-shaped panel 41 and the ease of construction, but it is preferable to make the gap as narrow as possible in order to protect the apron-shaped panel 41. The mounting location of the ceramic tile 43 may be set as necessary. For example, it is conceivable to shift the mounting location to the swirling downstream side according to the swirling direction of the conveyed gas. Further, if necessary, it may be mounted on the entire surface. The material of the ceramic style 43 is not particularly limited as long as it can protect the apron-like panel 41, which is the base material, from the collision of fine powder sprayed on the airflow of the conveyed gas, and is not particularly limited. For example, alumina, silica, and zirconia. , Magnesia, silicon carbide, silicon nitride, etc., and mixtures thereof can be used.

As shown in FIGS. 6A and 6B, the roller support portion 23c is provided on the back surface side of the concave edge portion 41a of the apron-shaped panel 41 (the back surface opposite to the front surface on which the conveyed gas is sprayed). A mounting seat 46 fixed with a fastening bolt 47 is formed on the formed seat surface 45. The mounting seat 46 is formed so as to project from the back surface side at two positions, an upper portion and a lower portion, at positions on both sides with respect to the concave edge portion 41a, and is hidden behind the fastening bolt 47, and thus is a bolt hole (not shown). Is formed.

Around the bolt hole of the mounting seat 46, the protector ring (protection wall) 48 for protecting the head of the fastening bolt 47 to be mounted from the collision of the fine powder is formed to project. Protector ring 48 is an annular vertical wall located around the head of the fastening bolt 47 which is mounted, have a height above the height of the head of the fastening bolt 47, the fastening bolt The head of 47 is prevented from being damaged by wear and hindering the replacement work. Further, each upper edge portion 41b located on both sides of the concave edge portion 41a of the apron-shaped panel 41 is provided with a suspension hook hole 49, which enables suspension support during replacement work.
On the other hand, the seat surface 45 provided on the roller support portion 23c is formed with screw holes (not shown) at the upper and lower portions corresponding to the mounting seat 46.

The apron-shaped panel 41 is suspended by using the hook holes 49, each mounting seat 46 is arranged at a predetermined position on the corresponding seat surface 45, and the fastening bolt 47 is inserted into the bolt hole of the mounting seat 46. It is attached to the journal head 23 by screwing and fastening to the screw hole of the seat surface 45. In this mounted state, the head of the fastening bolt 47 is surrounded by a protector ring 48, and the lower half of the roller support portion 23c in the vertical direction is protected by the apron-shaped panel 41 to ride on the airflow of the conveyed gas. Protects against wear by spraying and colliding with fine powder.

As shown in FIGS. 3 to 7, the shield 42 has a semi-frustum shape so as to surround a semi-cylindrical region inside the peripheral wall 11b of the housing 11 at the vertically lower portion of the axial portion 21b of the crushing roller 21. It is formed. As shown in FIG. 7, the shield 42 has a base end portion 42a on one side arranged along the concave edge portion 41a and fixed in the vicinity of the concave edge portion 41a by welding or the like. At the time of attachment, the shield 42 is formed in a semi-pyramidal shape (semi-polygonal frustum shape) in which the tip portion 42b on the other side extends toward the roller main body portion 21c, and surrounds the vertically lower portion of the axial portion 21b. In the shaft-shaped portion 21b, the fine powder is sprayed onto the lower portion of the shaft-shaped portion 21b in the vertical direction on the airflow of the transport gas from the transport gas outlet 32 and collides with the shield 42, but the fine powder collides with the shield 42. Cover the part to protect it from the collision of fine powder.

In the present embodiment, the shield 42 is formed in a semi-frustum shape by connecting a plurality of flat plate panels. A ceramic tile 44 made of hard ceramic is mounted on the surface of the shield 42 (the surface on the side where the transport gas from the transport gas outlet 32 hits) as a hard tile that protects the shield 42 from collision of fine powder. .. The ceramic tile 44 is mounted on the entire surface of the shield 42 so that the gap between the ceramic tiles 44 is narrowed. The mutual gap is determined by the difference in thermal expansion between the ceramic tile 44 and the shield 42 and the ease of construction, but it is preferable to make the gap as narrow as possible in order to protect the shield 42. The mounting location of the ceramic tile 44 may be set as needed, and may be partially mounted. Since the shield 42 of the present embodiment is formed by connecting a plurality of flat plates, the flat plate-shaped ceramic tile 44 can be easily attached.
For mounting the apron-shaped panel 41 and the shield 42, which are the base materials of the ceramic tiles 43 and 44, on the surface, for example, a plug fitted to the mounting holes of the ceramic tiles 43 and 44 is welded. The method may be applied.

The shape of the shield 42 is a semi-frustum shape, and as the outer circumference of the shaft-shaped portion 21b of the crushing roller 21 expands toward the roller main body portion 21c, the base end portion 42a to the tip portion 42b thereof. The diameter is gradually increasing toward. Then, the vertical lower region (here, one flat panel portion at the bottom) 42c of the semi-frustum shape when the shield 42 is attached is directed from the base end portion 42a to the tip end portion 42b (the central portion of the housing 11). (Toward), it is formed so as to incline downward from the horizontal direction at an angle θ equal to or greater than the angle of repose of the fine powder.

Except for the semi-frustum-shaped lower region 42c when the shield 42 is attached, the inner surface (surface) of the shield 42 is inclined downward from the horizontal direction from the base end portion 42a to the tip end portion 42b at an angle of the lower region 42c or more. The upward surface on the opposite side) is tilted at an angle equal to or greater than the angle of repose of the fine powder at any position in the mounted state.
Since the angle of repose of the fine powder is determined according to the fine powder and the surface state of the shield 42, it is preferable to set the angle θ according to the fine powder to be produced. It is more preferable to cover the portion where the fine powder is sprayed on the air flow of the transport gas and hit the fine powder, and to set a large angle θ having a margin larger than the angle of repose of the fine powder within the range of the arrangement space in the housing 11. For example, when the pulverized coal is pulverized coal, the angle θ is preferably in the range of 40 degrees to 50 degrees.

[Action and effect]
Since the roller journal protector 40 according to the embodiment of the present invention, the crushing roller unit 20 provided with the roller journal protector 40, and the crushing machine 10 are configured as described above, the journal head 23 is formed by the apron-shaped panel (mounting panel member) 41. The shield 42, which is detachably attached to the crushing roller 21, covers the lower half of the shaft-shaped portion 21b of the crushing roller 21 in the vertical direction to which the fine powder sprayed by the air flow of the conveyed gas hits. To protect. As a result, it is possible to prevent wear of the shaft-shaped portion 21b of the crushing roller 21 due to collision of fine powder, so that the life of the device can be extended.

Further, the apron-shaped panel 41 is a part of the opening 11c of the peripheral wall 11b of the housing 11 below the roller support portion 23c in the vertical direction, that is, the lower half portion of the roller support portion 23c in the vertical direction and both sides thereof. Since the region is attached so as to protect the region from the collision of fine powder sprayed on the airflow of the conveyed gas, in addition to the function of attaching the shield 42 to the roller support portion 23c or the like, the roller support portion 23c or the protrusion 23a The pivot pin 24 functions to protect the pivot pin 24 from the collision of fine powder sprayed on the air stream of the transport gas. As a result, it is possible to prevent the roller support portion 23c, the protrusion 23a, and the pivot pin 24 from being worn due to the collision of the fine powder, so that the life of the device can be extended.

Further, since the hard ceramic tiles 43 and 44 are mounted on the surfaces of the apron-shaped panel 41 and the shield 42, the collision of fine powder sprayed on the surfaces of the apron-shaped panel 41 and the shield 42 on the airflow of the conveyed gas. It can be protected from, and the surfaces of the apron-shaped panel 41 and the shield 42 are prevented or suppressed from being worn by the collision of fine powder sprayed on the airflow of the conveyed gas.

In the case of the apron-shaped panel 41, since the ceramic tile 43 is mounted only on a part of the surface mainly in the lower region 41P2 which is a region where the collision frequency of fine powder is relatively high, the material of the ceramic tile 43 is used. The cost can be suppressed. Of course, the same effect can be obtained with respect to the shield 42 as long as the ceramic tile 44 can be mounted only in the region where the collision frequency of the fine powder is relatively high.

Further, the fine powder blown up by the transport gas is adhered to the inner surface (upper surface) of the shield 42, but the inner surface of the shield 42 is inclined at an angle equal to or higher than the angle of repose of the fine powder at any location. The adhered fine powder falls while sliding on the inner surface of the shield 42 due to gravity. This makes it possible to prevent fine powder from accumulating on the inner surface of the shield 42.

Further, since the roller journal protector 40 is fixed by fastening the mounting seat 46 formed on the back surface of the apron-shaped panel 41 to the seat surface 45 of the roller support portion 23c with the fastening bolts 47, the fastening bolts 47 can be attached and detached. The roller journal protector 40 (shield 42 and apron-shaped panel 41) can be easily replaced.

Further, the protector ring 48 around the bolt holes of the mounting seat 46 is formed to project, the head of the fastening bolt 47 to be mounted is protected from the collision of the fine powder to be sprayed riding airflow carrier gas , is prevented or suppressed that the head of the fastening bolt 47 is worn by the collision of the fine powder, without the detachable tool unusable head of the fastening bolt 47 is worn, replace the roller journal protector 40 at the time of the work, carried out the removal of the fastening bolt 47 without any trouble.

The maintenance of the roller journal protector 40 is preferably performed by the following method.
That is, normally, the crusher 10 carries out inspections such as periodic inspections that are performed regularly, but it is necessary to confirm the state of the roller journal protector 40 and replace it at this periodic inspection timing or at another irregular inspection timing. It is determined whether or not it is in a depleted state (state determination step). Here, when it is determined that the state of the roller journal protector 40 is a worn state that needs to be replaced, or when it is determined that it is a preferable worn state that it is preferable to estimate the future usage status and replace it. , Replace the roller journal protector 40 with a suitable product prepared in advance (replacement process). Of course, if it is determined that the roller journal protector 40 does not need to be replaced until the next inspection, the replacement may not be performed.

Then, the roller journal protector 40, which is determined to be in a worn state in the state determination process and is removed by replacement, is subjected to repair and regeneration processing such as replacement and replacement of hard tiles, and is used in the next replacement. Prepare in advance for replacement as a suitable product (proper product) that can be used. If repair and regeneration processing is not possible, prepare a new one. The proper product of the roller journal protector 40 includes a new product and a recycled product that has been repaired and regenerated.

In this way, the wear state of the roller journal protector 40 is determined at the inspection timing of the crusher 10, and if necessary, the roller journal protector 40 is replaced with an appropriate product to efficiently, appropriately and easily maintain the roller journal protector 40. Therefore, the roller journal portion 20J of the crushing roller unit 20 can be protected for a long period of time, the performance of the crushing machine 10 can be ensured for a long period of time, and the machine life can be extended.

The roller journal protector 40 is configured to be replaced with the roller journal protector 40 prepared for replacement at the periodic inspection timing without determining the wear state, and the roller journal protector 40 removed by the replacement is not provided. If the reprocessing is performed as appropriate and stored for replacement, the processing can be performed in a short time, and the operation stop time of the crusher 10 required for the maintenance and management of the roller journal protector 40 can be shortened.

[Other]
Although the embodiments of the present invention have been described above, the present invention can be implemented by appropriately modifying the above embodiments without departing from the spirit of the present invention.
For example, in the above embodiment, ceramic tiles 43 and 44 made of hard ceramic are used as the hard tiles covering the surfaces of the apron-shaped panel 41 and the shield 42, but the hard tiles are not limited to this and have the required durability strength. It can be applied as long as it is made of a wear-resistant material.

Of course, it is preferable that the base material itself of the apron-shaped panel 41 and the shield 42 is also made of a material having high durability and strength. In this case, the hard tile may not be required depending on the durability and strength of the base material. However, as in the present embodiment, the apron-shaped panel 41 and the shield 42 are made of a general steel material, and the material cost can be kept low by attaching hard tiles to necessary parts on the surface thereof.

In the present embodiment, the shield 42 is formed in a semi-frustum shape by connecting a plurality of flat plate panels, so that the flat plate-shaped ceramic tile 44 can be easily attached. , May be formed in a curved shape according to the shape of the shaft-shaped portion 21b of the roller housing 21a .

Further, in the above embodiment, the protective wall portion is constituted by the protector ring is an annular vertical wall, protective walls head of the fastening bolt 47 located around the head of the fastening bolt 47 which is mounted As long as the part can be protected, it is not limited to the annular vertical wall.

10 Crusher 11 Housing 11a Ceiling of housing 11 11b Peripheral wall of housing 11 11c Opening of housing 11 12 Pedestal 13 Crushing table 13a Crushing surface 14 Input pipe 15 Inlet port 16 Classification blade 17 Rotary separator (classifying device)
18 Outlet port 20 Crushing roller unit 20J Roller journal part 21 Crushing roller 21a Crushing roller 21 roller housing 21b Roller housing 21a shaft-shaped part 21c Crushing roller 21 roller body part 22 Journal shaft (rotary support shaft)
23 Journal head 23a Protrusion part 23b Arm part 23c Roller support part 24 Pivot pin 25 Stopper 26 Actuator 27 Biasing device 28 Hydraulic cylinder 29 Plunger 30 Cover 32 Conveyance gas outlet 32a vane 40 Roller journal protector 41 Apron-like panel (mounting panel member) )
41a Concave edge of apron-shaped panel 41 41b Upper edge of apron-shaped panel 41 41c Side edge of apron-shaped panel 41 41d Intermediate lower edge of apron-shaped panel 41 41e Lower edge of apron-shaped panel 41 41P1 Apron-shaped Lateral area of panel 41 41P2 Lower area of apron-shaped panel 41 42 Shield 42a Base end of shield 42 42b Tip of shield 42 43,44 Ceramic tile as hard tile 45 Seat surface 46 Mounting seat 47 Fastening bolt 48 Protective wall Department (protector ring)
49 Suspension hook hole

Claims (12)

A journal head arranged in an opening formed in the peripheral wall of the housing of the crusher and oscillatingly supported by the peripheral wall by a swing shaft,
It is attached to the roller support portion of the journal head via a roller journal portion having a shaft-shaped portion rotatably supported, and comes into contact with the upper surface of a crushing table that rotates in the housing and rotates around to finely powder solid matter. A crushing roller having a roller body for crushing the body,
It is equipped in a crushing roller unit in which a transport gas outlet for blowing out the transport gas upward is arranged below the shaft-shaped portion in the vertical direction.
A protector that protects the roller journal portion from collision of the fine powder transported together with the transport gas.
The outer circumference of the shaft-shaped portion is expanded from the roller support portion toward the roller main body portion.
The mounting panel member to be attached to the journal head and
The diameter is expanded from the base end portion to the tip end portion according to the shape of the outer circumference of the shaft shape portion, and the shaft shape portion is formed in a semi-frustum shape surrounding the lower portion in the vertical direction, and the base end portion is formed. With a shield fixed to the mounting panel member, the tip portion extends toward the roller body portion side, and covers the portion where the transport gas from the transport gas outlet hits to protect the fine powder from collision. Have,
When the shield is attached, the inner surface of the shield in the vertical lower region of the semi-frustum shape is inclined downward from the horizontal plane at an angle equal to or greater than the angle of repose of the fine powder from the base end portion to the tip end portion. A roller journal protector characterized by being formed in. The shield, the roller journal protector according to claim 1, wherein the plurality of flat plates are joined is formed on the semi-frustum shape. The first or second aspect of the shield, wherein a hard tile that protects the shield from the collision of the fine powder is mounted on the surface of the shield on the side where the transport gas comes into contact with the transport gas outlet. Roller journal protector. The mounting panel member is arranged so as to close a part of the opening below the roller support portion in the vertical direction, and protects at least a part of the roller journal portion and the swing shaft from collision of the fine powder. The roller journal protector according to any one of claims 1 to 3 , wherein the roller journal protector is characterized. The mounting panel member is formed in a portion that is vertically upward at the time of mounting according to the outer peripheral shape of the lower half of the roller support portion, and is a semicircular concave edge portion that is arranged along the outer peripheral shape of the lower half. With
The base end of the shield is fixed in close proximity to the concave edge.
A hard tile that protects the mounting panel member from the collision of the fine powder is mounted on the surface of the shield that is located below the shield in the vertical direction and is exposed to the transport gas from the transport gas outlet. The roller journal protector according to claim 4 . The mounting panel member has a lateral region extending downward in the width direction and the vertical direction of the opening from each side of the outer circumference of the lower half portion of the roller support portion at the time of mounting, and the lower half of the roller support portion at the time of mounting. It has a lower region extending vertically downward on the outer circumference of the portion.
The roller journal protector according to claim 5 , wherein the hard tile is mounted on at least a part of the lower region. A mounting seat is formed on the back surface of the mounting panel member opposite to the front surface on the side where the transport gas from the transport gas outlet hits, and the seat surface formed on the roller support portion is fastened to the mounting seat. Detachable with bolts for
Around the bolt hole of the mounting seat, the head of the fastening bolt in any one of claims 4-6, characterized in that the protective wall portion is formed to protect from the collision of the fine powder The roller journal protector described. The angle at which the rotation axis of the crushing roller is tilted downward toward the crushing table is 15 to 40 °, and the angle at which the inner surface of the shield is tilted downward in the vertically downward region of the semi-frustum shape is 40 °. Greater than
The roller journal protector according to any one of claims 1 to 7, wherein the roller journal protector. A journal head arranged in an opening formed in the peripheral wall of the housing of the crusher and oscillatingly supported by the peripheral wall by a swing shaft,
It is attached to the roller support portion of the journal head via a roller journal portion having a shaft-shaped portion, and comes into contact with the upper surface of a crushing table that rotates in the housing and rolls around to pulverize a solid substance into fine powder. With a crushing roller having a roller body,
A crushing roller unit in which a transport gas outlet for blowing out transport gas upward is arranged below the shaft-shaped portion in the vertical direction.
A crushing roller unit characterized in that the roller journal protector according to any one of claims 1 to 8 is attached to the front roller journal portion. A crushing table that is rotatably supported in the housing around the axis along the vertical direction,
A crusher comprising the crushing roller unit according to claim 9. The maintenance management method for the roller journal protector according to any one of claims 1 to 8.
Conducted at the inspection timing of the crusher,
A state determination step of checking the state of the roller journal protector and determining whether or not replacement is a preferable wear state, and
Maintenance of the roller journal protector, which comprises a replacement step of replacing the roller journal protector with an appropriate product prepared in advance when the state of the roller journal protector is determined to be in a worn state in the state determination step. Management method. It is determined in the state determination step that the roller journal protector is in a worn state, and the removed roller journal protector is judged whether or not it is in a state where it can be repaired and regenerated. The maintenance management method for the roller journal protector according to claim 11, wherein the roller journal protector is prepared in advance by performing a repair / regeneration process as the appropriate product that can be replaced with the above.

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