JPS63305948A - Vertical grinder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

[Prior Art] Vertical pulverizers have been conventionally used as pulverizers for pulverizing coal, cement, and the like.

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. As the roller is in pressure contact with this outer circumferential part and rotates, the grains with spiral lines enter the space between the roller and the grinding table from a direction forming a certain angle with the roller axis direction and are bitten. Smash.

On the other hand, hot air is guided to the base of the casing by a duct, and this hot air blows up from the annular space between the outer circumferential surface of the grinding table and the inner circumferential surface of the casing, preventing the fine powder from being dried. 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 and collected as a product in a product collection device (eg, bag filter, cyclone).

[Problems to be solved by the invention: The product collection device of the 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. there were. In addition, when the collected product is forced to be conveyed, it is necessary to install the product collection device at a high place so that the pressure feeding device can be attached to the bottom of the product collection device, and an elevated pedestal is required. It was necessary.

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 moreover, the product collection device can be installed at a high place. It also eliminates the need for an elevated pedestal for installation. 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, the present invention will be described in detail 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, a middle casing 20b having an internal cone 20c with a circular cross-section drawn in the middle, and an upper casing 20d joined to the upper end of the middle casing 20b.
It is equipped with

A reducer 2 with a motor is disposed in the center of the lower casing 2Cla, 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 arranged on the upper outer circumferential edge of the grinding table 3, and each of the roller boss arms 4 has a conical head-mounted grinding roller 4 pivotally mounted on the lower end thereof. has been done.

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 5 is rotatably connected to a hydraulic cylinder 10 via a connecting rod 8, a turnbuckle 9, and a cylinder mouth 10a by a pin 7 and a fork end 7a, and a lower end of the hydraulic cylinder 10 is The base plate 1 is rotated by the rotating bin 11 and the rotating seat 12.
It is connected to 3.

Each crushing roller 4 is connected to a roller boss 5 via a roller shaft 4a.
The grinding table 3 is rotatably supported on the shaft, and its circumferential surface is in contact with the outer circumferential surface of the upper end of the grinding table 3.
It can be rotated in accordance with the rotation of.

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. Rotating axis 2
3 is supported by the fine powder discharge collar 22 via a bearing 24. This fine powder discharge port 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 bag filter in this embodiment, and has an outer shell 33 having a U-shaped cross section surrounding the middle casing 20b, and a space between the outer shell 33 and the middle casing. This serves as a collection chamber 34. This collection chamber 34 is divided into an upper chamber 34a and a lower chamber 34b by a plate 35.
It is divided into. The plate 35 is provided with a large number of filter installation openings 36, and bottomed and uncovered filters 37 are installed in the openings 36 to form the lower chamber 34.
It is arranged so as to hang down from b. The code 38 is the outer shell 33
This is an exhaust pipe that circulates around the upper chamber 34 through a large number of exhaust ports 39 passing through the pipe wall and the upper side surface of the outer shell 33.
It communicates with inside a. This exhaust pipe 38 has an exhaust duct 4
0 is set consecutively.

In addition, a plurality of discharge chutes 4 are provided on the floor surface of the outer shell 330.
1 is provided, and a rotary valve 42 and an extraction pipe 43 are connected to the lower end of the chute 41.

Note that a drive device 44 for the rotating shaft 23 is installed on the pedestal 20e fixed to the upper casing 20d, and the rotating shaft 23 is rotationally driven by this drive device 44. Reference numeral 16 is a raw material supply pipe, which is connected to the rotating shaft 2.
3 is inserted inside.

Below the outer periphery of the crushing table 3, as shown in FIG.
An annular hot air passage 21 connected to the hot air generator by a duct 18 is provided, and above the hot air passage 21, an inner circumferential wall 14a and an outer circumferential wall 14b are disposed between the crushing table 3 and the casing 20a. An annular space portion 14 is defined by.

This annular space 14 includes a plurality of plate-shaped blades 14c.
are arranged and fixed at equal intervals around the circumference while maintaining a required inclination angle with respect to the horizontal plane.

In addition, at the bottom of the hot air passage, there is a discharge chute 1 that temporarily discharges foreign objects during crushing and excess crushed materials in the event of overload.
9 is installed, and can be taken out from a discharge door 19b which is rotatable around a rotary bin 19a.

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 ground draws a spiral trajectory and moves toward the outer periphery of the grinding table 3. Since the crushing roller 4 is rotating on the outer periphery of the crushing table 3,
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 to the annular space 14,
These fine powders and intermediate particles rise inside the mill along with the hot air. The fine powder and intermediate particles that have risen flow into the classifier 15 from the side of the classifier 15 through between the blades 270. 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 particle size is sent to the discharge port of the discharge pipe 22.
2a and introduced into the lower chamber 34b of the product collection device 32 through a duct. Then, the particles are collected by the filter 37, and the exhaust air passes through the upper chamber 34a, the exhaust port 39, the exhaust pipe 38, and the exhaust duct 40, and reaches the exhaust fan (the path shown).

In addition, the collected particles fall off from the filter 37 due to shocks applied at appropriate times (for example, vibrations, back pressure to the filter 37, etc.), and are removed from the chute 41 and the rotary valve 42.
After that, it is taken out as a product from the take-out pipe 43.

In the above embodiment, the inner circumferential wall of the product collection device 32 was constructed from the middle casing 20b of the vertical crusher.
Effects such as reducing the number of parts and speeding up assembly can be obtained. In addition, since the discharge port 22 and the product collection device 32 are connected by a plurality of ducts 31, the duct pressure loss is reduced, and the pressure distribution in the collection chamber 34 (especially the lower chamber 34b) becomes even, and the filter It is possible to reduce pressure loss and improve collection efficiency.

The present invention can also be applied to various types of vertical crushers other than those shown in the figures.
For example, in the illustrated vertical crusher, the liner of the crushing table may not be a flat type, but an inclined type or a plate type, and the corresponding crushing rollers may be changed to a type that is compatible with these types. 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,
Since 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 for the product collection device, 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) In a vertical crusher equipped with a casing having a discharge port for fine powder conveyed by airflow at the top, a crushing table installed inside the casing, and a plurality of crushing rollers placed on the crushing table. . A vertical crusher, characterized in that a product collection device for collecting fine powder is attached to the outer periphery of the casing.