JPH053345B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a product collection method that uses a grinding table and a grinding roller in cooperation to grind cement raw materials, coal, chemicals, etc., and collects the fine powder as a product. The present invention relates to a vertical crusher equipped with a device.

[Conventional technology] As a crusher for crushing coal, cement, etc.
Vertical crushers have traditionally been used.

This vertical crusher consists of a disc-shaped crushing table that is driven by a motor with a reducer to rotate at low speed at the bottom of a cylindrical casing, and a part that divides the upper surface of the table equally in the circumferential direction, which is pressed by hydraulic pressure or the like. A classifier is installed in the upper part of the casing.

In this vertical crusher, powder as a raw material is supplied to the center of the crushing table through a supply pipe, and when the table rotates, the powder is subjected to centrifugal force in the radial direction of the table, and as it slides on the table, it is rotated by the table in the direction of rotation. It receives the force, slides between it and the table, and rotates somewhat slower than the table rotation speed. The above two forces, ie, the radial and rotational forces, are combined, and the powder moves to the outer periphery of the grinding table while drawing a spiral trajectory on the table. Since the roller is in pressure contact with this outer periphery and is rotating, the powder drawn in the spiral line enters between the roller and the grinding table from a direction forming a certain angle with the roller axis direction and is bitten. Smash.

On the other hand, hot air is guided to the base of the casing by a duct, and the fine powder is dried by blowing up the hot air from the annular space between the outer circumferential surface of the grinding table and the inner circumferential surface of the casing. It rises inside the casing, and is discharged from the outlet as a mixture with hot air and sent to the next process.

By the way, the material to be crushed supplied to the crusher is rarely crushed to the fine powder particle size required by this crusher after being subjected to the crushing action by the crushing rollers once, and it is rare that the material to be crushed is crushed into the fine powder particle size required by this crusher. Not all of the crushed material is bitten by the crushing rollers, so even if the powder and granules that reach the outer edge of the crushing table rise up on the hot air current blowing up from the annular space, they will not be able to get into the crusher. By the time the particles reach the classifier installed at the top, depending on their particle size, they may fall or be classified and rejected by the classifier and returned to the grinding table.

In this way, the material to be crushed that is constantly fed into the crusher rises from the crushing table to the classifier, or is crushed until it reaches the desired fine particle size to become the final product and flows out of the crusher. The particles fall from the middle of the ascending path from the table to the classifier over and over again until they are gradually pulverized to the desired particle size. The fine powder that has reached the desired fine particle size is discharged from the outlet,
The product is collected in a product collection device (eg, bag filter, cyclone).

[Problems to be solved by the invention] The product collection device of a conventional vertical crusher is installed at a location away from the main body of the vertical crusher, and therefore a separate space is required for the product collection device. It was hot. In addition, when the collected product is pumped, etc.
In order to attach the pressure feeding device to the lower part of the product collection device, it was necessary to install the product collection device at a high place, and an elevated frame was required. Furthermore, since the distance from the vertical crusher main body to the product collection device is long, there is a problem in that the duct pressure loss is also large.

[Means for Solving the Problems] The present invention is configured such that a product collection device for collecting fine particles discharged from a discharge port of a casing is attached to the outer periphery of the casing.

[Function] As described above, in the present invention, since the product collection device is attached to the outer periphery of the casing, the installation space for the product collection device can be saved, and the product collection device can be installed at a high place. This also eliminates the need for an elevated stand. Furthermore, since the distance from the vertical crusher body to the product collection device is very short, pressure loss can be significantly reduced.

[Example] Hereinafter, details of the present invention will be explained using examples shown in the drawings.

1 and 2 show a vertical pulverizer according to an embodiment of the present invention, FIG. 1 is an overall schematic vertical sectional view of the vertical pulverizer, and FIG. 2 is a vertical pulverizer of the same. FIG. 2 is a perspective view of the main parts of the machine.

In FIG. 1, a vertical crusher 1 is equipped with a casing 20 that houses the entire crushing section such as a crushing table 3, which will be described later. A casing 20a and an internal cone 2 with a circular cross section that is drawn in the middle.
It is provided with a middle casing 20b in which a casing 0c is installed, and an upper casing 20d joined to the upper end of the middle casing 20b.

A reducer 2 with a motor is disposed in the center of the lower casing 20a, and a grinding table 3 formed in a disk shape is attached to the output shaft facing upward. It is driven and rotates clockwise when viewed from above in FIG. A plurality of roller boss arms 5 are disposed on the upper outer peripheral edge of the grinding table 3, and each of the roller boss arms 5 has a conical head-mounted grinding roller 4 pivotally attached to its lower end, which is pivoted in a substantially horizontal state. There is.

A pressure frame 6 having an annular shape is fixed to the upper surface of the upper inner peripheral end of the roller boss arm 5 by means such as bolt tightening. It is integrally formed and mounted on the upper surface of the crushing table 3.
On the other hand, the upper outer peripheral end of each roller boss arm 5 is rotatably connected to a hydraulic cylinder 10 via a connecting rod 8, a turnbuckle 9, and a cylinder rod 10a by a pin 7 and a fork end 7a, and the lower end of the hydraulic cylinder 10 is It is connected to a base plate 13 by a pin 11 and a rotating seat 12.

Each crushing roller 4 is rotatably supported on a roller boss 5 via a roller shaft 4a, and its circumferential surface is in contact with the outer circumferential surface of the upper end of the crushing table 3, so that as the crushing table 3 rotates, Driven rotation is possible.

A rotary classifier 15 is installed above the center of the crushing table 3. The classifier 15 includes a plurality of rotating blades 27 supported by a rotating shaft 23 made of a cylindrical tube via a stay 25 and an inverted conical bottom cover 26. The rotating shaft 23 is supported by the fine powder discharge box 22 via a bearing 24. This fine powder discharge box 22 has a plurality of discharge ports 22a, and is connected to a product collection device 32 described below through a duct 31, as shown in FIG.

This product collection device 32 is a back filter in this embodiment, and is
It has an outer shell 33 with a U-shaped cross section surrounding b,
A collection chamber 34 is formed between the outer shell 33 and the middle casing. This collection chamber 34 is the plate 3
5 into an upper chamber 34a and a lower chamber 34b. The plate 35 is provided with a large number of filter installation openings 36, and a bottomed and uncovered filter 37 is attached to the openings 36 and is disposed so as to hang down into the lower chamber 34b. code 3
Reference numeral 8 designates an exhaust pipe that goes around the outer shell 33, and communicates with the inside of the upper chamber 34a through a large number of exhaust ports 39 that pass through the pipe wall and the upper side surface of the outer shell 33.
An exhaust duct 40 is connected to the exhaust pipe 38.

A plurality of discharge chutes 41 are provided on the floor surface of the outer shell 33, and a rotary bubble 42 and a take-out pipe 43 are connected to the lower ends of the chutes 41.

A driving device 44 for the rotating shaft 23 is installed on the pedestal 20e fixed to the upper casing 20d, and the driving device 44 drives the rotating shaft 23.
is designed to be rotationally driven. Reference numeral 16 denotes a raw material supply pipe, which is inserted through the rotating shaft 23 .

As shown in FIG. 1, below the outer periphery of the crushing table 3, there is provided an annular hot air passage 21 connected to a hot air generator through a duct 18, and above the hot air passage 21, An annular space 14 is defined between the crushing table 3 and the casing 20a by an inner circumferential wall 14a and an outer circumferential wall 14b. In this annular space 14, a plurality of plate blades 1 are provided.
4c are arranged and fixed at equal intervals around the circumference while maintaining a required inclination angle with respect to the horizontal plane.

In addition, a discharge chute 19 is installed at the bottom of the hot air passageway to temporarily discharge foreign matter during crushing and surplus materials to be crushed in the event of overload, and a discharge door 19b that is rotatable around a rotating pin 19a. The structure allows for easier removal.

The operation of the vertical crusher configured as above will be explained next.

After starting the reducer 2 with a motor to rotate the grinding table 3, the material to be ground is supplied to the center of the upper surface of the grinding table 3 through the supply pipe 16 using a conveyor such as a conveyor (not shown) while maintaining airtightness. Then, due to the rotation of the grinding table 3 and the centrifugal force of the rotation, the object to be crushed draws a spiral trajectory and moves toward the outer periphery of the grinding table 3. Grinding table 3
Since the crushing roller 4 is rotating on the outer periphery of the
Most of the moved object to be crushed is caught between the crushing roller 4 and the crushing table 3, and is crushed into fine powder by compression, impact, and shearing action. This fine powder, coarse particles and intermediate particles that are not bitten by the crushing roller 4 and come off the periphery of the crushing table 3 fall into the annular space 14, but at this time, they are sent through the duct 18 by the hot air generator. Since the hot air blows up from the hot air passage 21 into the annular space 14, these fine powders and intermediate particles rise inside the crusher together with the hot air. The fine powder and intermediate particles that have risen flow into the classifier 15 from outside the classifier 15 through between the blades 27 . The classifier 15 is rotated at a predetermined speed (arrow R), and when passing between the blades 27, coarse particles collide with the blades 27 and fall along the blades 27.

In this way, the fine powder that has been classified by the classification action of the classifier and has reached the desired fine powder particle size is discharged from the discharge port 22a of the discharge pipe 22, and passes through the duct to the lower chamber of the product collection device 32. 34b. Then, the particles are collected by the filter 37, and the exhaust air is sent to the upper chamber 34a, the exhaust port 39, and the exhaust pipe 38.
and an exhaust fan (not shown) via an exhaust duct 40.

In addition, the collected particles are exposed to shocks applied at appropriate times (for example, vibrations, back pressure to the filter 37, etc.).
It falls off from the filter 37, and the chute 41,
The product is taken out as a product through a rotary valve 42 and from a take-out pipe 43.

In the above embodiment, since the inner peripheral wall of the product collection device 32 is formed of the middle casing 20b of the vertical crusher, effects such as a reduction in the number of parts and speeding up of assembly can be obtained. In addition, since the discharge box 22 and the product collection device 32 are connected by the plurality of ducts 31, the duct pressure loss is reduced and the pressure distribution in the collection chamber 34 (especially the lower chamber 34b) is uniform. As a result, filter pressure loss can be reduced and collection efficiency can be improved.

The present invention can also be applied to various types of vertical crushers other than those shown in the figures. For example, in the vertical crusher shown in the figures, the liner of the crushing table is not a flat type, but an inclined type or a plate type, and a corresponding crushing roller is used. You may change it to a type that is compatible with these. In addition, various other types of classifiers can be used as the classifier.

[Effects of the Invention] As explained above, according to the vertical crusher according to the present invention, the product collection device for collecting fine powder is directly attached to the outer periphery of the casing. There is no need to provide a separate installation space, which can be omitted. Further, since there is no need to install the product collection device at a high place unlike in the past, an elevated pedestal can also be eliminated. Furthermore, since the distance from the crusher main body to the product collection device can be made much shorter than in the past, it has the effect of significantly reducing duct pressure loss.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic vertical sectional view of a vertical crusher according to an embodiment of the present invention, and FIG. 2 is a perspective view of essential parts of the vertical crusher. 1... Vertical crusher, 3... Grinding table, 4...
...Crushing roller, 20...Casing, 22a...
Discharge port, 32... product collection device.

Claims (1)

[Claims] 1. A vertical pulverizer equipped with a casing having a discharge port for fine powder conveyed by air flow at the top, a pulverizing table installed in the casing, and a plurality of pulverizing rollers arranged on the pulverizing table,
A vertical crusher characterized in that a product collection device for collecting fine powder is attached to the outer periphery of the casing.