JPH0549961A - Vertical-type crusher - Google Patents

Abstract

PURPOSE:To provide a vertical-type crusher which can drop the raw material overflowing into a rotary table from the circumferential edge of the rotary table to make the sticking or the wearing as little as possible and discharge the dropped raw material and circulate it again while keeping the air-tight condition from outside. CONSTITUTION:A vertical discharging outlet 20 of a dropped raw material is formed immediate by under the outer circumference of a rotary table 3 and a vertical discharging chute 24 connected with the discharging outlet is installed and a scraper 22 to scraping together the raw material dropped from the circumference edge of the rotary table 3 to the discharging outlet 20 is fixed in the rotary table 3, and at the same time, a closed-type belt conveyer 100 is installed in the lower part of the discharging chute 24 and also at least one level switch for raw material detection is installed in the discharging chute 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical type crusher for crushing cement clinker, blast furnace slag, coal, chemicals, etc. by cooperation of a rotary table and a crushing roller, and particularly to a vertical crusher that circulates raw materials externally. The present invention relates to a vertical crusher that crushes fine powder.

[0002]

2. Description of the Related Art A vertical crusher equipped with a rotary table and a crushing roller is widely used as a kind of crusher for finely crushing granular materials such as cement raw materials, coal and chemicals into powder. This type of crusher is driven by a motor with a speed reducer in the lower part of a cylindrical casing and rotates at a low speed. And a plurality of crushing rollers that are driven to rotate.

For example, in FIG. 4 showing a conventional vertical crusher, a crusher generally designated by reference numeral 1 is formed as a single tower in appearance, and its base is rotated by an electric motor (motor) and a speed reducer 2A. The rotary table 3 is arranged. A plurality of conical grinding rollers 4 are arranged so as to rotate in sliding contact with the rotary table 3, and the grinding rollers 4 are rotatably supported by a support arm 5. The support arm 5 is fixed at its center to a support shaft 6 which is rotatably supported on the side of the crusher. Further, the support arm 5 extends downward through a side of a casing 8 surrounding the rotary table 3. ， It faces the lower space of the crusher. The lower end of the support arm 5 is the crusher 1
A base of the pressure cylinder is rotatably supported at its tip end by a rod of a pressure cylinder (not shown) whose lower end is rotatably supported.

The granules as a raw material supplied from the raw material supply device (raw material hopper 50 and constant feed wear 60) to the center of the rotary table 3 through the raw material supply pipe 11 and the roller 4 driven by the rotation of the table. It is bitten between the rotary table 3 and crushed. On the other hand, hot air is introduced into the casing 8 by a duct (not shown) and the gas box 16, and this hot air is supplied to the rotary table 3
Annular space portion 1 between the outer peripheral surface of the casing and the inner peripheral surface of the casing 8.
By being blown up from 2, the fine powder ascends in the crusher 1 while being dried, and as a mixture with the hot air, the discharge port 13
Discharged to the next step. On the other hand, among the crushed products, the coarse particles and coarse particles excluding the fine powder fall against the rising air flow,
It is scraped by the scraper 22 and gathered in one place on the circumference, and is discharged through the discharge port 20 and the discharge chute 30 while being kept airtight by the double damper 70, and through the bucket elevator 80 and the belt conveyor 90. Then, it is returned to the raw material supply pipe 11. FIG. 5 shows a double damper 70.
2 is a vertical cross-sectional view of a front and rear passages 72a, 72b, and a flap 74 for opening and closing the passages 72a, 72b.
a and 74b are rotatably provided around rotating shafts 76a and 76b, respectively, and are opened and closed so that one is closed when one is opened by a rotary operation mechanism (not shown), while maintaining airtightness with the outside air. Only raw materials can pass through.

Some coarse particles have a crusher 1
Although it goes up inside, it is classified by the separator 14 having the rotating blades 14a arranged on the upper circumference evenly and returned to the rotary table 3. The rotary table 3 has a rotary shaft (not shown) extending vertically downward, and has a reference numeral 2A.
In the casing of the speed reducer shown in Fig. 1, in addition to the speed reducer that reduces the rotational force of the motor and transmits it to the rotary shaft of the rotary table 3, a thrust bearing mechanism for supporting the rotary table 3 via the rotary shaft. And a radial bearing mechanism (both not shown).

[0006]

[Problems to be Solved by the Invention] As described above,
In order to supply the raw material to the vertical crusher and to send all of the crushed products to the separator by the rising air flow blown up from the annular space passage 12 on the outer circumference of the rotary table or to return it to the rotary table 3 against the gravity of the raw material. Is, for example,
A high-speed air flow of 20 to 50 m / sec is required, and the fan power is excessive. For this reason, the wind velocity of the ascending airflow in the annular space passage is made extremely small, and most of the raw materials and pulverized products other than the fine powder are dropped as they are from the periphery of the rotary table 3 and discharged from one outlet to the outside. A so-called external circulation system (also known as a stone-exhaust circulation system) has been adopted in which the material is returned to the raw material supply pipe by a mechanical transportation device. However, if the crushed raw material has a strong adhesiveness, for example, a raw material such as blast furnace slag or clay, the passage 72a of the double damper 70,
72b, flaps 74a, 74b, etc. adhere to or abrade them, so that labor and cost are spent for suspension and repair due to blockage due to development of adhesion and replacement of worn parts. Therefore, the double damper, which is prone to adhesion and wear, is abolished and the raw material is discharged while maintaining airtightness.
In addition, an alternative plan for equipment with less adhesion and wear has been desired.

[0007]

In order to solve the above problems, the vertical crusher of the present invention is rotatably supported so that its upper surface is horizontal and is driven to rotate about a vertical axis by a driving device. A table, a raw material supply pipe for supplying a raw material onto the rotary table, a crushing roller slidably arranged on the rotary table, and a rotary separator for classification disposed on the top, , So that the crushed material falling from the rising air supply part on the periphery of the rotary table can be taken out of the crusher and returned to the raw material supply pipe of the crusher by the transport device arranged outside the crusher so that it can be re-injected into the crusher. In the vertical crusher according to the present invention, a discharge outlet for falling raw materials and a vertical discharge chute connected to the discharge outlet are arranged immediately below the outer circumference of the rotary table, and the scrap material for scraping the raw material dropped from the periphery of the rotary table to the discharge outlet. The thereby fixed to the rotary table, arranged a closed belt conveyor at the bottom of the outlet chute, and has a structure provided with at least one or more level switch in the outlet chute.

[0008]

In the vertical crusher of the present invention, a vertical discharge chute and a closed belt conveyor are installed in place of the double damper, which is apt to wear due to adhesion and dropping of raw materials, and a level switch for raw materials is provided. By adopting a structure that discharges the raw material through a material seal (material airtightness),
We have succeeded in greatly reducing adhesion and wear. With this method, there is no special opening / closing mechanism, the belt conveyor is operated only when the raw material is above the height of a certain position, and the belt conveyor stops as soon as the raw material is below the level switch. Airtightness is maintained by filling the raw materials. In addition, since there is no member such as an opening and closing flap with which the raw material comes into contact, wear due to the collision and fall of the raw material is eliminated, and the wear member only slides on the inner surface of the discharge chute.
Since the falling speed (that is, the sliding speed) is small, the progress of wear is small.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention,
FIG. 1 is a schematic perspective view of a discharge chute portion, FIG. 2 is a vertical sectional view of a raw material discharge portion, and FIG. 3 is an operation explanatory view of a hermetic belt conveyor.

As shown in FIGS. 1 and 2, the rotary table 3
There is an annular space passage 12 on the outer periphery of the exhaust gas, and an exhaust port 20 is provided at one position on the circumference of an annular gas box 16 below the exhaust gas chute 24. A closed belt conveyor 100, whose periphery is closed by a cover, is arranged so that the raw materials that fall and accumulate from the side wall opening at the bottom of the discharge chute 24 can be discharged and transferred in the traveling direction of the belt. On the side wall of the discharge chute, level switches 26, 26 are provided at two upper and lower positions to penetrate the side wall and detect the presence or absence of the raw material inside. The structure other than the above is the same as that described in the prior art, and the description thereof is omitted.

In the vertical crusher of the present invention constructed as described above, a part of the raw material dropped to the rotary table 3 during operation is crushed by being caught between the crushing roller 4 and the rotary table 3. However, the raw material that does not contact the crushing roller 4 overflows the rotary table 3 as it is, falls into the annular space passage 12, overcomes the rising air current, and reaches the bottom of the gas box 16 by gravity, and the scraper attached to the rotary table 3 It is scraped up by 22 and falls from the discharge port 20 to the discharge chute 24 and accumulates.

The raw material deposited on the discharge chute 24 is
It is discharged by the closed belt conveyor 100 by the following procedure. As shown in FIG. 3A, the discharge chute 2
When the raw material of No. 4 becomes higher than the high level switch 26H and the level switch 26H is switched from OFF to ON, the belt conveyor 100 which has been stopped until then is activated and the raw material level is gradually lowered. In FIG. 3B, the belt conveyor 100 is in operation and the raw material level gradually decreases, but the low level switch 26L is still in the ON state. When the raw material level further decreases and the raw material level falls below the low level switch 26L, and the level switch 26L changes from the ON state to the OFF state, the belt conveyor 100 stops its operation and the raw material transfer is interrupted. After that, the raw material level gradually recovers (rises) with the operation of the vertical crusher, and eventually returns to the state of FIG. 3 (a) and the level switch 26H is turned off.
To ON and the belt conveyor 100 restarts operation again. By performing sequence control so as to automatically repeat the above operations, the belt conveyor 100 is operated such that the raw material level does not become empty and the raw material level is always present between the level switch 26H and the level switch 26L. Therefore, the raw material can be discharged while preventing the invasion of outside air.

In the above-described embodiment, the level switch is 2
Although the operation was shown for the case of one piece, when there is one level switch and the mounting position is the position of the level switch 26L or the intermediate position between the level switches 26H and 26L, when the detection of the raw material by this level switch is ON The belt conveyor 100 may be operated, and the operation may be stopped when there is no raw material by this level switch (when it is OFF).

[0014]

As described above, in the vertical crusher of the present invention, the vertical discharge chute, the closed belt conveyor, and the level switch are used together to maintain the airtightness of the outside air and to reduce the adhesion and wear. Since the raw materials can be discharged, the maintainability is improved and the productivity is increased.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a discharge chute portion showing an embodiment of a vertical crusher of the present invention.

FIG. 2 is a vertical sectional view of a raw material discharge part showing an embodiment of a vertical crusher of the present invention.

FIG. 3 is an operation explanatory view of a closed belt conveyor showing an embodiment of a vertical crusher of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

FIG. 5 is a vertical sectional view of a double damper used in a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinder 3 Rotating Table 4 Grinding Roller 11 Raw Material Supply Pipe 12 Annular Space Passage 14 Rotary Separator 16 Gas Box 20 Discharge Port 22 Scraper 24 Discharge Chute 26 Level Switch 26H Level Switch (High) 26L Level Switch (Low) 30 Discharge chute 50 Raw material hopper 60 Constant feed wear 70 Double damper 80 Bucket elevator 90 Belt conveyor 100 Closed belt conveyor

Claims (1)

[Claims] 1. A rotary table, which is pivotally supported so that its upper surface is horizontal, and is driven to rotate about a vertical axis by a drive unit, a raw material supply pipe for supplying a raw material onto the rotary table, and the rotary table. It is equipped with a grinding roller slidably arranged on the top and a rotary separator for classification arranged on the top, and the ground material falling from the rising air supply part on the periphery of the rotary table is taken out of the grinder. In a vertical crusher in which a transport device arranged outside the crusher can be returned to the raw material supply pipe of the crusher and re-charged into the crusher,
A discharge port for the falling raw material and a vertical discharge chute connected to the discharge port are arranged immediately below the outer circumference of the rotary table, and a scraper for scraping the raw material dropped from the peripheral edge of the rotary table to the discharge port is fixed to the rotary table. A vertical crusher characterized in that a closed belt conveyor is disposed below the discharge chute, and at least one level switch is provided on the discharge chute.