JP2626833B2 - Vertical crusher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical pulverizer for pulverizing raw materials such as limestone, blast furnace slag, and cement raw material by cooperation of a rotary table and a pulverizing roller. .

[Prior Art] As one type of crusher for finely pulverizing raw materials such as limestone, blast furnace slag, and cement raw material into powder, a vertical crusher having a rotary table and crushing rollers as shown in FIG. 1 is widely used. This type of crusher includes a disk-shaped rotary table 3A that is driven by a motor 2A by a speed reducer 2 and rotates at a low speed in a lower part of a cylindrical casing 1a, and a hydraulic pressure is applied to a portion that equally divides an outer peripheral portion of an upper surface thereof in a circumferential direction. And a plurality of crushing rollers 4 that are driven to rotate by being pressed by the like.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are swingably supported by a shaft 6 on a casing 1a. 4 is pressed onto the rotary table 3A to give a pulverizing pressure to the raw material. As shown in FIG. 5, a bearing 8a for supporting the shaft 6 and a bearing housing 8 for housing the bearing 8a are fixed to the upper surface of the gantry 20. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A to adjust the layer pressure of the raw material, 14 is an annular space passage around the rotary table 3A for gas blowing, 15 is a hot air blowing passage, 13
Is a rotary separator for classifying the raw material pulverized by the blades 13A, 16 is an outlet for taking out a product together with gas, and 17 is a raw material input chute.

In such a vertical crusher, the raw material supplied to the center of the rotary table 3A by the raw material charging chute 17 receives centrifugal force in the table radial direction due to the rotation of the rotary table 3A and slides on the rotary table 3A. The rotary table 3A receives a force in the rotation direction, and slides between the rotary table 3A and performs a rotation somewhat slower than the rotation speed of the rotary table 3A.
The above two forces, that is, the forces in the radial direction and the rotational direction are combined, and the raw material moves on the turntable 3A to the outer periphery of the turntable 3A along a spiral trajectory. Since a roller is pressed against this outer peripheral portion and rotated, the raw material describing the spiral enters the grinding roller 4 and the rotary table 3A from a direction that forms an angle with the roller axis direction and bites. Rarely crushed.

On the other hand, air is applied to the base of the casing 1a by a duct,
Alternatively, gas such as hot air is introduced, and the gas is blown up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, so that the crushed fine powder is entrained by the gas. As a result, the product having a predetermined particle size is discharged from the outlet 16 together with the gas and sent to the next step.

[Problem to be solved by the invention] In the conventional vertical pulverizer as described above, for example,
When grinding blast furnace slag, etc., when blast furnace slag is mixed with moisture, the blast furnace slag has self-hardening properties, and when it enters the vertical crusher via the raw material input chute, the dry heat source flowing through the vertical crusher The hot air gas is heated and solidified while adhering to the inner surface of the raw material charging chute, gradually developing and narrowing or closing the passage in the chute, thereby impeding the smooth flow of the raw material.

The vertical pulverizer of the present invention is for removing the deposits on the inner surface of the above-mentioned raw material charging chute and keeping the inner surface of the chute clean at all times while continuing the operation of the pulverizer.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a vertical pulverizer of the present invention comprises a plurality of rotatable pulverizing rollers disposed on an upper surface of an outer peripheral portion of a rotary table, and a central portion of the rotary table. In a vertical pulverizer for applying a predetermined pulverizing pressure to a pulverizing roller to pulverize a raw material supplied via a raw material charging chute hanging directly above, between the upper surface of the rotary table and the peripheral surface of the pulverizing roller, A rotating shaft, which is rotatable and bent in a substantially L-shape, is provided on the central axis, and a lever protruding horizontally from the rotating shaft in the radial direction of the raw material charging chute is provided at substantially equal intervals in the vertical direction of the rotating shaft. A plurality of vertically long plate-shaped cutters, each of which is pin-joined to one of the ends of the lever and one end of which is in contact with the inner surface of the raw material charging chute, are arranged, and the other end of the cutter and the other end are provided. Pull between lever It has a structure that pivotally coil spring.

[Operation] In the vertical pulverizer of the present invention, a rotating shaft bent in a substantially L-shape is suspended from directly above the raw material input chute, and a lever is provided on the raw material chute so as to protrude vertically at substantially equal pitch. Since the cleaning device has a cutter that is pin-joined to the tip of the lever and the edge of which is pressed against the inner surface of the material input chute by the biasing force of the tension coil spring and comes into contact with the material input chute, the rotating shaft is driven and rotated during operation. Thereby, the cutter cleans while removing the attached matter on the inner surface of the chute. At this time, when there is a particularly hard adhered substance and the rotational driving motor has an excessively large resistance so as to be overloaded, the cutter escapes against the urging force of the tension coil spring and functions as a safety device.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall vertical sectional view of a vertical crusher, FIG. 2 is a plan sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 2 is a cross-sectional plan view of a main part as viewed from III-III.

In the figure, 1 is a vertical pulverizer, 2 is a speed reducer, 2A is an electric motor, 3A is a rotary table, 3B is a dam ring, 4 is a pulverizing roller, 5 is an arm, 6 is a shaft, 7 is an arm, and 8 is a bearing housing. , 8a is a bearing, 9 is a hydraulic cylinder, 10 is a piston rod, 13 is a separator, 13A is a separator blade, 14 is an annular space passage, 15 is a hot air blowing passage, 16 is a discharge port, and 17 is a material input chute. The structure and operation are as described in the prior art.

Next, the cleaning device 100 will be described. The cleaning device 100 is for cleaning the inner surface of the raw material charging chute 17, and includes a rotating shaft 110 bent substantially in an L-shape hanging from the upper portion of the raw material charging chute 17 on the center axis, and a rotating shaft 110. Lever 120 that protrudes horizontally at approximately equal intervals in the vertical direction
And a fork end sandwiching the lever 120 at the end of the lever 120, and a vertically long plate-like cutter 130 which is horizontally rotated by a pin fulcrum 130a.
A tension coil spring 140 is pivotally mounted between the other end and the lever 120 so that one end of the cutter 130 contacts the inner surface of the chute. The material of the cutter 130 may be hard plastic or elastic rubber other than steel.

As described above, the cleaning device 100 having the cutters 130 arranged over substantially the entire length of the raw material input chute 17 is connected to the variable speed motor 150 installed at the upper end of the rotating shaft 110, and has an arbitrary rotation speed. That is, it is rotationally driven in a range of about 20 to 100 rpm. It should be noted that a constant-speed electric motor may be used depending on usage conditions.

Then, as shown in FIG. 2, where there is no deposit 50 in the raw material charging chute 17, the cutter 130 has a small degree of extension of the tension coil spring 140, so the force of contact with the inner surface of the chute is weak, and the cutter 130 extends along the inner surface of the chute. Rotate. Where the deposit 50 is present, the cutter 130 rotates appropriately around the pin fulcrum 130a in accordance with the thickness and hardness of the deposit 50, and in the process, the pressing force of the tension coil spring 140 and the circumference of the inner surface of the chute. The attached matter 50 is scraped off little by little by the shearing force of the cutter 130 in the direction to clean the inner surface of the chute 17. It is necessary to appropriately increase or decrease the rotation speed of the variable speed motor 150 in consideration of the frequency of sticking of the deposit 50. The operation of the cleaning device 100 may be continuous or may be intermittent operation at appropriate time intervals, for example, 5 minutes operation minus 10 minutes pause.

However, when the pulverized raw material is sticky and particularly easily adhered, the cleaning device 100 is used for the raw material charging chute 17.
Since it is provided inside, there is a risk of blocking the passage of the input raw material, and the raw material may form a bridge with the cleaning device 100 as a nucleus and may be blocked, so even when it is not necessary to perform the cleaning operation, the speed is low. It is desirable that the rotating shaft 110 be driven to rotate. Therefore, during the operation of the crusher 1, the cleaning device 100 is operated alternately between a low speed and a high speed, and the operation time ratio between the low speed and the high speed is determined in consideration of the properties of the raw materials and the state of adhesion.

[Effects of the Invention] As described above, in the vertical pulverizer of the present invention,
Since a cleaning device having a cutter for cleaning the inner surface of the material input chute by the rotating shaft is provided, it is possible to automatically remove the deposits on the inner surface of the material input chute during operation and by remote control. Therefore, the inner surface of the chute is kept clean, and a smooth raw material supply is ensured.

[Brief description of the drawings]

1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall vertical sectional view of a vertical crusher, FIG. 2 is a plan sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 2 is a cross-sectional plan view of a main part as viewed from III-III. 4 to 5 show an embodiment of a conventional vertical pulverizer, FIG. 4 is an overall vertical sectional view, and FIG. 5 is a side view as viewed in FIG. Reference Signs List 1 ... Vertical crusher, 2 ... Reducer, 3A ... Rotating table, 4 ... Pulverizing roller, 17 ... Material chute, 50 ... Adhered matter, 100 ... Cleaning device, 110 ... Rotating shaft , 120… lever, 130… cutter, 130 a… pin fulcrum, 140… tension coil spring, 150… variable speed motor.

Claims (1)

(57) [Claims] A plurality of rotatable crushing rollers are disposed on the upper surface of an outer peripheral portion of a rotary table, and a raw material supplied via a raw material charging chute hanging directly above a central portion of the rotary table is supplied to a crushing roller at a predetermined crushing pressure. Crushing between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a pressure to the center axis from just above the raw material charging chute so as to be substantially L
A plurality of levers projecting horizontally in the radial direction of the raw material charging chute from the rotation shaft are arranged at substantially equal intervals in the vertical direction of the rotation shaft; A vertically long, plate-shaped cutter having a pin joined to each of the tips and one end contacting the inner surface of the material input chute is disposed, and a tension coil spring is pivoted between the other end of the cutter and the lever. Vertical grinder characterized by wearing.