JPH029899Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vertical pulverizer that pulverizes coal, cement raw materials, chemicals, etc. through the cooperation of a rotary table and rollers.

[Conventional technology] As a type of pulverizer that finely grinds and pulverizes granules such as coal, cement raw materials, and chemicals, a vertical pulverizer is equipped with a rotating table and a pulverizing roller that rotates as the table rotates. The machine is widely used. This type of crusher has a horizontal disk-shaped rotary table located at the bottom of a cylindrical casing that is driven by a motor with a reducer to rotate at low speed, and a hydraulic pressure etc. installed on the upper surface of the rotary table that divides the outer periphery of the table equally in the circumferential direction. It is equipped with a plurality of crushing rollers that rotate while being pressed against each other.
The granules as raw materials are fed into the center of the rotary table through a vertical or inclined chute.
Due to the rotation of the rotary table and the accompanying centrifugal force, it moves to the outer periphery, enters between the roller and the rotary table, and is bitten and crushed. The pulverized fine powder is dried by hot gas blowing up from below and transported to the separator at the top of the casing, where only those of a predetermined particle size move on to the next process, and the rest fall onto the rotating table. Re-ground.

In such a crusher, the chute that supplies the raw material onto the rotary table is simply formed into a cylindrical shape with a cylindrical or rectangular cross section, and the raw material is
A feeder provided on the upstream side of the chute draws out a fixed amount of the liquid, slides on the inner wall surface of the chute, and supplies it onto the rotary table.

[Problems to be solved by the invention] However, the feedstock passing through the chute contains fine powder, and for example, when the raw material has a high moisture content, such as coal, these A phenomenon occurs in which fine powder adheres to the inner wall surface of the chute and gradually grows, reducing the passage area of the raw material within the chute. Incidentally, this kind of adhesion of fine powder to the inner wall surface of the chute is caused by the fine powder being blown up inside the crusher by the hot gas.
This is done by entering the chute.

On the other hand, in conventional crushers, the raw material in the chute is left to fall naturally, so if the passage area in the chute becomes smaller due to the adhesion of fine powder, the raw material does not fall smoothly, and in extreme cases, the inside of the chute It was almost clogged and almost no raw material could be supplied, and the operation of the crusher had to be interrupted to remove the deposits, resulting in a decrease in productivity.

[Means for Solving the Problems] In order to solve these problems, the present invention includes a rotary table, a rotary roller that rolls on the upper surface of the outer periphery of the rotary table, and a lower end above the rotary table. In a vertical crusher having a raw material supply chute provided facing the raw material supply chute, an outer circumferential surface has a predetermined length inside the raw material supply chute and is in sliding contact with an inner wall surface of the raw material supply chute, and the upper and lower surfaces of this outer circumferential surface are A plurality of annular scraping bodies with corners formed and hollow inside are arranged at intervals along the axial direction of the raw material supply chute, and each scraping body is along the axis of the chute, and
The scraping body is connected to each other by a plurality of rod-shaped connecting members arranged at intervals in the circumferential direction to form an integral housing, and the scraping body is attached to one end of the housing on the side opposite to the rotary table. A drive shaft is attached in the axial direction of the raw material supply chute, and the drive shaft and the drive cylinder are bently connected by a pin, and the housing is reciprocated in the axial direction of the raw material supply chute by the drive cylinder. By providing the movable structure, the outer circumferential surface of the scraping body can be slid back and forth on the inner wall surface of the raw material supply chute, and the scraping body scrapes off fine powder adhering to the inner wall surface of the raw material supply chute. It is made to be moisturized.

[Function] According to the present invention, the scraping body reciprocates in the axial direction of the chute on the inner wall surface of the raw material supply chute through which the raw material passes, and reliably scrapes off the fine powder adhering to the inner wall surface of the chute. Therefore, it is possible to smoothly supply raw materials to the crusher and improve productivity. According to the present invention, the following characteristic actions are performed during this scraping operation. That is, each of the plurality of scraping bodies arranged along the axis of the raw material supply chute has an outer peripheral surface having a predetermined length that slides while being guided by the inner wall surface of the chute. Since the fine powder is attached to the inner wall of the chute, it can be scraped off by the corners formed at the top and bottom corners of the outer circumferential surface. It will be peeled off. Moreover, deposits on the inner wall surface of the chute are removed at the upper and lower corners of the scraping body both during reciprocating and backward movement.

Since each scraping body is framed as a housing, it is allowed to deform as a whole (especially torsional deformation), and the drive shaft and drive cylinder attached to one end of the housing are By being bendably connected by the pin, when the scraping body moves along the cylinder and removes deposits at the upper and lower corners of the outer circumference, the inner wall surface of the chute and this corner When movement resistance force or peeling resistance force acts due to contact between However, the casing itself is allowed to undergo some degree of torsional deformation, and the drive shaft is bent at the pin portion, allowing for smooth movement of the casing within the chute. The action of peeling off and scraping off deposits on the wall surface is reliably performed. Note that the plurality of scraping bodies are connected to each other by a plurality of rod-shaped connecting members provided along the axis of the chute, which is the direction of movement of the scraping bodies, so there is no possibility that the scraping bodies will be compressed or shrunk in the direction of movement. There is no deformation, and the deposits are reliably peeled off and scraped off at the corners of the outer peripheral surface of each scraping body.

Moreover, since the raw material passes through the hollow part inside the scraping body, the scraping operation is performed while the raw material is being supplied to the crusher, that is, even while the crusher is operating, and the crushing productivity is improved. In addition, by providing a plurality of scraping bodies along the chute, the reciprocating stroke of the housing can be shortened and the operation can be stabilized, and the stroke of the driving cylinder can also be short.

[Examples] The present invention will be described in more detail below with reference to embodiments shown in the drawings.

1 and 2 show an embodiment of the vertical crusher according to the present invention, FIG. 1 is a longitudinal sectional view thereof, and FIG.
The figure is an enlarged longitudinal cross-sectional view of the lower end of the chute, and FIG. 3 is a cross-sectional view taken along the - line in FIG. 2.

In the figure, a crusher 1 includes a cylindrical tower-shaped casing 3 that stands upright on the floor and is surrounded by an annular deck 2 for work and monitoring. Motor 4 is fixed. A rotary table 6 formed in the shape of a disk and having a liner 5 adhered to its horizontal upper surface is attached to the rotating shaft facing upward of the motor 4, and is driven by the motor 4 to rotate horizontally at low speed. There is. Reference numeral 7 denotes a plurality of arm shafts horizontally supported by the casing 3 in close proximity to the outside of a portion that equally divides the peripheral edge of the rotary table 6 in the circumferential direction. An L-shaped arm 8 is attached to the shaft 7, and a roller shaft 9 is mounted on a bearing part integrally formed at one free end of the arm 8 so that it becomes slightly lower toward the inside. It is tilted and supported in a fixed manner. A crushing roller 10, which is formed into a truncated conical shape and whose outer periphery is detachable for replacement, is rotatably mounted on the inwardly projecting portion of the bearing portion of each roller shaft 9. Its peripheral surface is brought into contact with the outer peripheral part of the rotary table 6. 11 is a pressure cylinder pivotally supported on the base plate 12 corresponding to each arm 8, the working end of the piston rod is pivotally connected to the other free end of the arm 8, and the pressure cylinder 11 is actuated. As a result, the arm 8 swings and the pressing force of the roller 10 on the rotary table 6 changes, so that the crushing force for the object to be crushed held between the rotary table 6 and the roller 10 is adjusted. . A spring type shock absorber 13 is interposed between the arm 8 and the casing 3 side and cushions the impact of the roller 10 on the rotary table 6 due to the rotation of the arm 8.

An upper casing 14 formed in a cylindrical shape whose diameter becomes slightly larger toward the top is joined to the annular upper plate at the upper end of the casing 3, and a separator 15 formed in an inverted conical shape is arranged inside the upper casing 14. has been done. Reference numeral 16 denotes a raw material supply chute formed in a cylindrical shape, which stands upright with its lower end facing above the center of the rotary table 6, and whose upper and lower ends are connected to the upper and lower ends of the upper casing 14. They are fixedly supported by the respective parts. This shot 1
A funnel-shaped cylindrical connecting pipe 17 whose diameter increases upwardly is connected to the upper end flange part of 6.
Furthermore, a raw material hopper 18 is provided at the upper end flange part.
The lower end flange portion of the feeder 19 having the above-mentioned shape is joined. Inside this feeder 19, a raw material hopper 18 is provided.
A conveyor 20 is provided to transport the raw material supplied from the pipe and drop it into the connecting pipe 17.

Inside the vertical cylindrical chute 16, there are a plurality of scrapers 21 (in this embodiment 5 pieces) are provided. These scrapers 21
is formed in an annular shape with an outer diameter slightly smaller than the inner diameter of the chute 16 to the extent that it can slide along the inner wall surface 16a of the chute 16 in the axial direction (longitudinal direction) of the chute 6. , the adjacent scrapers 21 are connected by a plurality of rod-shaped scraper connecting members 22 that are arranged evenly in the circumferential direction on the inner peripheral surface of the scraper 21 and whose longitudinal direction extends in the axial direction of the chute 16. has been done. These scrapers 21 and the scraper connecting member 22 form an integral cage-shaped structure as a whole, and the raw material is formed so that it passes through the inside of each scraper 21 and falls onto the rotary table 6.

Each scraper 21 has an outer peripheral surface having a predetermined length and is guided by the inner wall surface of the raw material supply chute 16 to ensure its movement, and the upper and lower corners of the outer peripheral surface are Corner (right angle)
is formed.

A trident-shaped scraper support member 23 is fixed to the uppermost scraper 21, and the upper end of this scraper support member 23 is connected to the feeder 1.
A scraper drive shaft 24 passing through the connecting pipe 17 is connected to the working end of a piston rod 26 of a scraper drive cylinder 25 supported by a frame on the upper part of the scraper drive cylinder 9 via a pin 27.

For this reason, each annular scraper 21
By driving the cylinder 25, the outer peripheral surface (outer edge) 21a of the cylinder 25 is brought into sliding contact with the inner wall surface 16a of the chute 16, so that it can freely move back and forth in the axial direction of the chute 16.

The vertical spacing between adjacent scrapers 21 is at least equal to the stroke of the cylinder 25, so that the inner wall surface 16a of the chute 16 and the outer circumferential surface 21a of the scraper 21 are always in sliding contact with each other. outer peripheral surface 2
1a and an inner wall surface 16a of the chute 16 can be brought into sliding contact over the entire length of the chute 16.

Note that FIGS. 1 and 2 show the case where each scraper 21 is at the lowest position with respect to the chute 16.

Further, the structural members such as the scraper connecting member 22 and the scraper supporting member 23 are selected to have a size, shape, and quantity that do not hinder the passage of the raw material.

The scraper driving cylinder 25 is an air cylinder or the like, and is configured to be driven intermittently by a timer.

On the other hand, although not shown, this crusher 1 is equipped with a hot gas supply device, which is connected to the lower part of the casing 1 through a duct, and the supplied hot gas is distributed between the peripheral edge of the rotary table 6 and the casing 3 The powder is blown up through the annular space between the particles, passes through the inside of the casing 3 and the separator 15 in the upper casing 14, and is sent to the next process together with the crushed fine powder.

The operation of the vertical crusher of the present invention constructed as described above will be explained by taking coal crushing as an example.

After starting the motor 4, granular coal is supplied to the raw material hopper 18, and this coal is conveyed by the conveyor 20 of the feeder 19, and is passed through the connecting pipe 17 and the chute 1.
6 and falls to the center of the rotary table 6.
The fallen granular coal orbits together with the rotary table 6, and centrifugal force due to rotation acts on it, so it traces a parabolic trajectory that combines both of these forces and moves toward the outer periphery of the rotary table 6. Moving. Since the roller 10 is pressed against the outer periphery and rotates, the granular coal that has drawn a parallel line enters between the roller 10 and the rotary table 6 from a direction forming an angle with the roller axis direction and is bitten. Shattered. In addition, particles that try to fall from the periphery of the rotary table 6 without heading toward the roller 10 are returned to the rotary table 6 by the hot gas blowing up the space outside the periphery, giving them another chance to be crushed. Given. After the crushed coal becomes pulverized coal and is blown up inside the upper and lower casings 3 and 14, it is classified by a separator 15, and only those of a predetermined particle size are moved to the next process. It falls and is re-pulverized.

As mentioned above, when pulverizing such coal, pulverized coal containing water mixed into the supplied coal may adhere to the inner wall 16a of the chute 16, or pulverized pulverized coal containing water may be exposed to hot gas. However, inside the chute 16, the outer circumferential surface 21a is
A plurality of scrapers 21 are provided as scraping bodies that slide in sliding contact with the inner wall surface 16a of the chute 16 in the axial direction of the chute 16. Since the pulverized coal is driven at a high frequency, the pulverized coal adhering to the inner wall surface 16a of the chute 16 is scraped off by the scraper 21 and falls toward the rotary table 6 of the pulverizer. Therefore, during this scraping operation, each of the scrapers 21 serving as a plurality of scraping bodies arranged along the axis of the raw material supply chute 16 has an outer circumferential surface having a predetermined length that touches the inner surface of the chute 16. Slide guided by the wall and shoot 1
The pulverized coal adhering to the inner wall surface of the chute 6 is scraped off by the corners formed at the upper and lower corners of the outer peripheral surface, and is firmly attached to the inner wall surface of the chute 16. Even pulverized coal can be reliably removed.
Moreover, the chute 1 is removed at the upper and lower corners of this scraper 21 during both forward and backward movement.
The pulverized coal adhering to the inner wall surface of No. 6 is removed.

Since each scraper 21 is framed as a casing, it is allowed to deform as a whole (particularly torsional deformation), and has a scraper drive shaft 24 and a driving cylinder 25 attached to one end of the casing. are bendably connected by pins 27, so that when the scraper 21 moves along the chute 16 and scrapes the pulverized coal at the upper and lower corners of its outer circumference, the inner wall surface of the chute 16 Due to contact with this corner, movement resistance force or peeling resistance force acts, or these forces act on a partial position in the circumferential direction of the inner surface of the chute, causing a force in a biased direction to the casing. Even when the casing is acted on, the casing itself is allowed to undergo some degree of torsional deformation, and the scraper drive shaft 24 is bent at the pin 27, allowing smooth movement of the casing within the chute 16, allowing the scraper 21 and the shoot to The action of peeling off and scraping off the pulverized coal adhering to the inner wall surface of the chute 16 through contact with the inner wall surface of the chute 16 is reliably performed. In addition, since the plurality of scrapers 21 are connected to each other by a plurality of rod-shaped connecting members 22 provided along the axis of the chute 16, which is the direction of movement of the scrapers 21, there is no possibility that the scrapers 21 will be compressed or shrunk in the direction of movement. There is no deformation, and the deposits are reliably peeled off and scraped off at the corners of the outer peripheral surface of each scraper 21.

Moreover, since the raw material passes through the hollow part inside the scraper 21, the scraping operation is performed while the raw material is being supplied to the pulverizer, that is, even while the pulverizer is operating, and the pulverization productivity is improved. Note that the scraper 21 is
By providing a plurality of cylinders along the line 6, the reciprocating stroke of the housing can be shortened, resulting in stable operation, and the stroke of the driving cylinder 25 can also be short.

In this embodiment, the scraping body 21 is provided for the raw material supply chute 16 which is formed in a cylindrical shape and is provided upright with respect to the rotary table 6, but the shape of the chute, Alternatively, the mounting manner is not limited to this case,
For example, the chute may be installed at an angle with respect to the rotary table 6 and have a rectangular cross-sectional shape. In this case, the scraping body is attached to the raw material passing portion of the inner wall surface of the chute (for example, the bottom surface of the chute). For example, a scraper with a concave planar shape corresponding to the shapes of the chute (and both side surfaces) is provided so as to be able to reciprocate in the axial direction of the chute.

[Effects of the invention] As is clear from the above explanation, the vertical crusher of the present invention has the configuration described in the claims for utility model registration, so it is difficult to process fine powder with high moisture content such as coal. Even if it adheres to the inner wall of the chute, it is all scraped off by the scraper, so the falling supply of the raw material does not stagnate, the raw material is smoothly supplied onto the rotary table, and the supply amount is maintained normally. At the same time, the grinding operation is not interrupted to remove deposits, and productivity is significantly improved compared to the conventional method.
In particular, in the present invention, during the scraping operation, each of the plurality of scraping bodies arranged along the axis of the raw material supply chute has an outer peripheral surface having a predetermined length that is guided by the inner wall surface of the chute. At the same time, the scraping body has corners formed at the top and bottom corners on its outer circumferential surface, so the fine powder adhering to the inner wall surface of the chute is scraped off by the top and bottom corners. Even fine powder that is scraped off and firmly adhered to the inner wall surface of the chute can be reliably peeled off. Moreover, it is possible to efficiently remove deposits from the inner wall surface of the chute at the upper and lower corners of the scraping body both during forward movement and backward movement. Since each scraping body is framed as a housing, deformation (particularly torsional deformation) is allowed as a whole, and the drive shaft and drive cylinder attached to one end of the housing are connected to each other by pins. As the scraping body moves along the chute and removes deposits at the upper and lower corners of its outer periphery, the inner wall surface of the chute and this corner When movement resistance force or peeling resistance force acts due to contact between However, the casing itself can be twisted to some extent, and
The drive shaft can be bent at the pin, allowing the housing to move smoothly within the chute.
The contact between the scraping body and the inner wall surface of the chute ensures the removal and scraping action of the deposits on the inner wall surface of the chute. In addition, since the plurality of scraping bodies are connected to each other by a plurality of rod-shaped connecting members provided along the axis of the chute, which is the direction of movement of the scraping bodies, there is no possibility that the scraping bodies will be compressed or shrunk in the direction of movement. The material will not be deformed and deformed, and the deposits can be reliably peeled off and scraped off at the corners of the outer peripheral surface of each scraping body.

In addition, since the raw material can pass through the hollow part inside the scraping body, the scraping operation can be performed while the raw material is being supplied to the crusher, that is, even while the crusher is in operation, improving crushing productivity. I can do it. By providing a plurality of scraping bodies along the chute, the reciprocating stroke of the housing can be shortened to stabilize the operation, and the stroke of the driving cylinder can also be shortened.

[Brief explanation of the drawing]

1, 2, and 3 show an embodiment of the vertical crusher according to the present invention, FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is an enlarged longitudinal sectional view of the lower end of the chute,
FIG. 3 is a sectional view taken along the - line in FIG. 2. 1... Vertical crusher, 3... Casing, 4...
Motor with reducer, 6...Rotary table, 10...
Rotating roller, 16... Raw material supply chute, 21...
...Scraper (scraping body), 22...Scraper connecting member, 24...Scraper drive shaft, 25...
Cylinder.

Claims (1)

[Scope of utility model registration request] In a vertical crusher having a rotary table, a rotary roller that rolls on the upper surface of the outer periphery of the rotary table, and a raw material supply chute provided with its lower end facing above the rotary table, the outer periphery is inside the raw material supply chute. An annular scraping body whose surface has a predetermined length and is in sliding contact with the inner wall surface of the raw material supply chute, has corners formed at the upper and lower corners of the outer peripheral surface, and is hollow inside is attached to the raw material supply chute. A plurality of scraping bodies are arranged at intervals along the axial direction, and the longitudinal direction of each scraping body is aligned with the axis of the chute, and
The scraping body is connected to each other by a plurality of rod-shaped connecting members arranged at intervals in the circumferential direction to form an integral housing, and the scraping body is attached to one end of the housing on the side opposite to the rotary table. A drive shaft is attached in the axial direction of the raw material supply chute, and the drive shaft and the drive cylinder are bently connected by a pin, and the housing is reciprocated in the axial direction of the raw material supply chute by the drive cylinder. A vertical crusher characterized in that the scraping body is movably provided so that the outer circumferential surface of the scraping body can slide back and forth on the inner wall surface of the raw material supply chute.