JPS62186954A - Vertical type crusher - 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 Field of Application] The present invention relates to a vertical pulverizer that pulverizes cement raw materials, coal, chemicals, etc. through cooperation between a rotating table and pulverizing rollers.

[Prior Art] Vertical pulverizers equipped with a rotary table and rollers are widely used as a type of pulverizer for finely pulverizing granules such as cement raw materials, coal, and chemicals into powder. This type of crusher consists of a rotary disc-shaped rotor that rotates at low speed driven by a motor with a speed reducer at the bottom of a cylindrical casing, and a table that is press-fitted using hydraulic pressure or the like to equally divide the outer periphery of the upper surface in the circumferential direction. It is equipped with a plurality of rollers that are driven and rotated. The granules as raw materials supplied to the center of the rotary table through the supply pipe receive a centrifugal force in the radial direction of the table due to the rotation of the table, and as they slide on the table, they receive a force in the rotational direction of the table. The powder slides between the table and rotates at a speed somewhat slower than the rotation speed of the table.Two forces greater than or equal to 0, that is, forces in the radial direction and in the rotational direction, are combined, and the powder traces a spiral trajectory on the table and rotates at a speed somewhat slower than the rotation speed of the table. Move to the section. Since the roller is in pressure contact with this outer periphery and is rotating, the particles with spiral lines enter from a direction forming a certain angle with the axial direction of the roller between the roller and the rotary table, and are bitten and crushed. Ru. 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 rotary 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.

[Problem to be Solved by the Invention 1] There are two types of crushing force that act on the granules caught between the rotary table and the crushing roller. One is compressive force and the other is shear force. The compressive force is generated by pressing the grinding roller against the rotary table using a hydraulic or spring type drive device. On the other hand, as shown in FIG. 3, if the circumferential velocity (circumferential velocity) of the crushing roller 4 and rotary table 3 are the same at point A, the shearing force is The granules fed onto the rotary table 3 due to the difference in minute speed are
However, when the crushing roller 4 rotates driven by the rotation of the rotary table 3 as in the conventional case, if the granules to be crushed and other conditions are constant, the crushing roller 4 and the rotary table The way to bite between 3 is
Since it is determined by the rotational speed of the rotary table 3 and the force pressing the crushing roller 4 against the rotary table 3, that is, the tension of the crushing roller 4, the crushing roller 4 in FIG.
If the position of the point A where the circumferential speed of the rotary table 3 and the circumferential speed of the rotary table 3 match does not change and the vertical crusher 1 is operated for a long time, the crushing rollers 4 and the rotary table 3 will partially wear out, which is uneven wear. This will cause

Furthermore, when attempting to perform high-fine pulverization of granules in the conventional vertical pulverizer 41!1, the amount of raw material supplied to the vertical pulverizer 1 is reduced, the tension of the pulverizer rollers 4 is increased, and Furthermore, an operating method is adopted in which the rotation speed of the separator 15 is increased and the conditions for taking out the product from the crushing system of the vertical crusher 1 are made stricter. However, if the tension of the crushing roller 4 is increased, vibrations generated in the vertical crusher 111 will increase, which will hinder operation, and there is also a limit to increasing the rotational speed of the separator 15. It was difficult to achieve high-fine pulverization of the granules.

[Means for Solving the Problems] In order to eliminate these drawbacks, in the present invention, conventionally, when tension pressure is applied to the crushing roller and the rotary table is rotated after being brought into pressure contact with the rotary table, the upper surface of the rotary table is A variable speed drive motor was installed on the grinding roller, which was rotating in contact with the grinding roller, to create a device that forcedly drives the grinding roller to rotate independently of the rotation of the rotary table.

[Function] In the vertical crusher of the present invention, when the rotary table rotates at a constant rotation speed, tension pressure is applied and the rotary table is pressed against the top surface of the table. The crushing roller is forced to rotate at an arbitrary rotation speed using a variable speed drive motor. Therefore, the relative circumferential speeds of the rotary table and the crushing roller in the circumferential direction change, and a point where the circumferential speeds of the rotary table and the crushing roller match can be arbitrarily selected, thereby preventing uneven wear of both.

[Embodiment] Fig. 1 shows an embodiment of a vertical crusher to which the present invention is applied.In the central part of the crusher, which is indicated by the symbol l as a whole, a motor 2 rotates at a predetermined rotational speed. A rotary table 3 is arranged. A plurality of crushing rollers 4 are placed on the rotary table 3, and the crushing rollers 4 are rotatably supported by a support arm 5. The support arm 5 is fixed to a support shaft 6 rotatably supported on the crusher side, and one end of a rotation arm 7 is fixed to the support shaft 6. The end extends below the rotary table 3 and is rotatably supported on a rod 9 of a pressure cylinder 8 whose lower end is rotatably supported at the base of the crusher. Then, this pressure cylinder 8 is operated. By doing this, the crushing roller 4 is rotated about the support shaft 6, and the contact pressure against the rotary table 3 is adjusted.

On the other hand, the other end of the roller shaft lO, on which the crushing roller 4 is fixed at one end, is engaged with the output shaft of a variable speed drive motor 12 disposed on a motor seat 11 fixed to the support arm 5. .

The operation of the embodiment of the vertical crusher of the present invention configured as described above will be explained.

The material to be crushed is inputted from the upper input port 13, falls approximately at the center of the rotary table that rotates at a predetermined number of rotations, and slides in a spiral shape on the table due to the centrifugal force in the radial direction of the table due to the rotation of the table. . Then, the material to be crushed is bitten by a crushing roller which is rotated at an arbitrary rotation speed by the drive motor 12 and rolled on the outer peripheral surface of the rotary table 3 by the operation of the pressure cylinder 8, and is subjected to compression and shearing action. crushed.

On the other hand, hot air is introduced into the base of the casing 1a of the crusher by a duct, and as this hot air blows up from the annular space 14 between the outer peripheral end surface of the rotary table 3 and the inner peripheral surface of the casing la, The fine powder rises inside the casing while being dried, reaches the separator 15 as a mixture with hot air, is subjected to a classification action, and is then discharged from the discharge port 16 and sent to the next process. Also, relatively coarse powder particles are blown away by the separator and returned onto the rotary table.

However, when the object to be crushed is crushed between the crushing roller and the rotary table, the object to be crushed is subjected to compressive force and shearing force. Of these, the shearing force is Since the crushing roller is driven only by the rotary table, the vertical axis of the rotary table and the axis of the truncated conical crushing roller intersect on the upper surface of the rotary table, as shown in Fig. 3, as described above. Therefore, the circumferential speeds match only at one point of the roller width, such as point A, and at other points of the roller width, the crushing roller slips in the circumferential direction with respect to the rotary table. This slip,
That is, the circumferential velocity difference is the main cause of exerting a shearing action on the object to be crushed, and contributes to the crushing. However, as a matter of course, areas with large shearing action are also areas with large wear and tear, and in the case of Fig. 3, the circumferential speeds of both are synchronized at point A, so the areas with severe wear are the areas where the crushing roller Therefore, in the conventional example, the rotary table rotation speed is constant (Nr
pm), the progress of wear is uneven in the width direction of the grinding roller, resulting in uneven wear.

Therefore, in the present invention, the crushing roller is forcibly driven,
As shown in Figure 2, the rotational speed of the rotary table is constant (N
rpm), but the number of rotations of the crushing roller (ny
rp■) can be arbitrarily changed during operation, and the synchronization point can be set at any point other than point A. For this reason.

When uneven wear progresses during actual operation, for example, when the wear on the large diameter portion becomes greater than on other parts, the rotation speed of the crushing roller is increased in order to select the synchronization point near B.
Aim to equalize wear in the width direction. If the wear of the small diameter portion is progressing, perform the reverse operation.

In addition to the above, changes in the grinding conditions, that is, changes in the pulverizability of the material to be crushed, changes in the product particle size, and changes in the tension oil pressure associated with these changes, can affect the progress of wear in the width direction of the grinding rollers. Depending on the change, the rotation speed of the crushing roller is changed in a direction that corrects the non-uniformity of the wear.

[Effects of the Invention] As described above, by changing the rotational speed of the crushing roller, the relative circumferential speed between the crushing roller and the rotary table can be freely adjusted, and the circumferential speeds of the crushing roller and the rotary table can be matched. By changing the point (synchronization point) arbitrarily in the roller width direction, uneven wear of the crushing roller and rotary table can be prevented. Furthermore, by increasing the circumferential velocity difference between the crushing roller and the rotary table, the shearing force applied to the powder can be strengthened and the crushing efficiency can be improved. In addition, when performing highly fine pulverization of powder, as in the past, the vibration of the vertical pulverizer increases as the supply amount is reduced, the tension pressure is increased, and the separator rotation speed is increased. Irrespective of the operating method, the above-mentioned operation can be performed by increasing the circumferential speed difference between the crushing roller and the rotary table to increase the shearing force, so the generation of vibration is small and the safety of the equipment can be ensured. It has excellent advantages.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a main part of a vertical crusher showing an embodiment of the present invention, Fig. 2 is an explanatory view of a longitudinal cross-section of a main part of a crushing section in an embodiment of the present invention, and Fig. 3 is a conventional It is an explanatory view of a principal part longitudinal cross section of the crushing width in an example. 1...Vertical crusher, 3...Rotary table, 4
...Crushing roller, 10...Roller shaft, 12.
...Variable speed drive motor. Patent applicant: Ube Industries, Ltd. Figure 2 Figure 3

Claims (1)

[Claims] In a vertical crusher, a plurality of crushing rollers are pressed against the upper surface of a rotary table that is connected to a motor for driving the rotary table and rotates around a vertical axis to crush raw materials to be crushed. A vertical crusher characterized by being connected to a variable speed drive motor that is separate from the main motor.