JPH0716482A - Vertical pulverizer - Google Patents

Abstract

PURPOSE:To provide a vertical pulverizer capable of executing operation with good pulverizing efficiency by holding the height of fall of a feed raw material at the fixed appropriate one according to the variation in the thickness of a raw material layer during operation. CONSTITUTION:A movable chute 30 which is connected to a raw material throw-in chute 17 and is freely vertically ascendable and descendable, and an elevating/descending means (a hydraulic cylinder 40 or a servomotor 42) are installed, and a controller 50 for giving an operation command signal for changing the height of the lower end of the movable chute 30 according to the variation in the thickness of a raw material layer during operation to the elevating/ descending means is equipped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical crusher for crushing raw materials such as cement raw materials, slag, clinker, ceramics, chemicals, etc. by cooperation of a rotary table and a pulverizing roller, and particularly to a vertical type crusher in operation. The present invention relates to a vertical crusher intended to maintain a proper height of a falling height of a feed material according to a change of a raw material layer thickness and maintain good pulverization.

[0002]

2. Description of the Related Art FIG. 5 is a kind of crusher for pulverizing raw materials such as limestone, slag, and cement raw material into fine powder.
As shown in (1), a vertical crusher 1 having a rotary table and a crushing roller is widely used. This kind of crusher
At the lower part of the cylindrical casing 15, a disk-shaped rotary table 3A driven by a speed reducer 2 by a motor 2A to rotate at a low speed, and hydraulically pressure-contacted with a portion equally dividing the outer peripheral portion of its upper surface in the circumferential direction, and driven to rotate. And a plurality of crushing rollers 4.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 through an arm 5 and an arm 7 which are pivotally supported by a shaft 6 on a casing 15, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against the rotary table 3A to apply a crushing pressure to the raw material. 3B is a dam ring provided on the outer periphery of the rotary table 3A for adjusting the raw material layer thickness, 14 is a gas blowing annular space passage around the rotary table 3A, 14A is a gas supply passage, and 13 is a raw material crushed by blades 13A. A rotary separator for classification, 16 is an outlet for taking out a product together with gas, and 17 is a raw material charging chute.

In such a vertical crusher, the raw material supplied to the central portion of the rotary table by the raw material chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. Sometimes the rotary table 3A receives a force in the direction of rotation,
It slides with A and makes a rotation somewhat slower than the rotation speed of the rotary table 3A. The above two forces, that is, the radial direction force and the rotational direction force are combined, and the raw material is the rotary table 3.
A spiral locus is drawn on A to move to the outer peripheral portion of the rotary table 3A. Since the roller is pressed against the outer periphery and is rotating, the raw material in which the spiral is drawn enters between the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten therein. It is crushed and crushed.

On the other hand, a gas such as air or hot air is introduced into the base of the casing 15 by a hot air duct 20, and this gas is an annular space between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing. By being blown up from 14, the pulverized fine powder is entrained in the gas and rises in the casing 15, and is subjected to the classification action by the blades 13A of the separator 13 located at the upper portion, and the product having a predetermined particle size is discharged together with the gas through the discharge port 16 And sent to the next process.

On the other hand, when the amount of raw material supplied does not change during the operation of the vertical crusher, and the operating conditions such as the number of rotations of the table, the tension hydraulic pressure applied to the crushing roller, the ventilation amount, and the dam ring height are also unchanged. The thickness of the raw material layer formed by the upper surface of the rotary table and the peripheral surface of the crushing roller is kept substantially constant except for small variations. However, the pulverizability of the raw material to be supplied, the particle size composition and the water content are changing every moment,
When this change is significant, the raw material layer thickness may change greatly even if the operating conditions are not changed during operation.

[0007]

As described above, when the raw material layer thickness greatly changes during operation due to some reason, or when the raw material layer thickness changes due to a change in operating conditions, In the case of the conventional fixed type feed chute, the lower end position is unchanged, so the height from the bottom of the feed chute to the surface of the feed layer changes. Therefore, the behavior of the raw material discharged from the raw material charging chute falling on the surface of the raw material layer, repelling it, and then moving on the rotating rotary table is slightly different from that before, and among the raw materials dropped on the rotary table, There is a disadvantage that the ratio of the amount of raw material directly bitten into the crushing roller is reduced and the crushing efficiency is reduced.

[0008]

In order to solve the above-mentioned problems and to cope with the change of the raw material layer thickness, in the present invention, a plurality of rotatable crushing rollers are provided on the upper surface of the outer peripheral portion of the rotary table. In a vertical crusher for arranging and crushing the raw material supplied through the raw material chute hanging on the upper surface of the center of the rotary table between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller. A movable chute which is connected to the raw material charging chute and which can be vertically moved up and down, and means for moving the movable chute up and down, and an operation signal for changing the height of the lower end of the movable chute according to the fluctuation of the raw material layer thickness during the operation. The configuration is such that a control device for transmitting to the lifting means is provided.

[0009]

In the present invention, based on the change in the raw material layer thickness detected by the layer thickness sensor, a command is issued to the moving chute raising / lowering means to raise / lower the movable chute, and the height of the raw material layer surface and the lower end of the movable chute is adjusted. Hold at an appropriate value. Therefore, the raw material supplied to the raw material feeding chute always drops from the lower end of the movable chute with an appropriate height onto the surface of the raw material layer, draws almost the same trajectory, and is bitten by the pulverizing roller, so that the pulverizing efficiency is maintained well. .

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention,
1 is a plan view of a main part of a vertical crusher, FIG. 2 is a vertical sectional view of a main part of a vertical crusher, FIG. 3 is a side view of a main part of a vertical crusher showing another embodiment, and FIG. FIG. 3 is a plan view of a main part of a vertical crusher showing the embodiment of FIG. In the figure, a movable chute 30 is provided at the lower end of the raw material feeding chute 17 of the vertical crusher 1 so as to move up and down along the outer circumference of the raw material feeding chute 17 by branching by the number of the crushing rollers 4 for horizontal support. A pair of left and right hydraulic cylinders 4 on the outside of the casing 15 via the rod 32.
It is constructed so that it can be raised and lowered by 0, 40. The movable chute 30 is made of a steel plate and has a cylindrical shape. The discharge port 30a at the lowermost end is open to the biting side of the crushing roller 4, and the lower end of the discharge port 30a is preferably about 50 to 100 mm from the surface of the raw material layer. . The shape of the movable chute 30 may be curved as shown in FIG. 1, or a straight pipe may be bent and connected.
In any case, it is necessary to make the shape such that the raw material passing through the inside does not stay in the middle.

As means for raising and lowering the movable chute 30, FIG.
In addition to the hydraulic cylinder 40 shown in FIG. 2, as shown in FIG. 3, bearings 42c, 4 are provided at both upper and lower ends with a gear 42b that meshes with a gear 42a attached to the output shaft of the servomotor 42.
By rotating the rotatable ball screw rod 42d pivotally supported by 2c, the movable chute 30 can be moved up and down by moving up and down the support rod 32 screwed together.

The movable chute 30 constructed as described above
As shown in FIG. 1, in order to input the measurement result of the layer thickness sensor 60 which indirectly measures the raw material layer thickness through the vertical displacement of the crushing roller 4 every moment and keep it at the preset optimum height. The controller 50 that sends the lifting command of (1) to the hydraulic cylinder 40 of the lifting means or the servomotor 42 is automatically lifted during operation. It should be noted that the roller displacement repeats minute vertical movements during operation, information of this minute displacement is calculated, the average level of the raw material layer thickness during a certain period of time is calculated, and the movable chute 30 is based on this average level. Control to move up and down.

FIG. 4 shows another embodiment of the present invention, in which a plurality of raw material charging chutes 17, 17 provided separately by the number of crushing rollers 4 (two in the case of the drawing) are respectively movable chutes 30.
Is configured to be movable up and down via a hydraulic cylinder 40 or a servo motor 42. In this case, when the raw material layer thicknesses of the crushing rollers 4 and 4 are different, the movable chute 30 is individually adjusted to the optimum height. Can be held at.

As described above, in the vertical crusher of the present invention, a movable chute which is vertically movable up and down is connected to the raw material charging chute 17 so that the raw material layer thickness can be changed. Since the height of the layer surface and the height of the movable chute outlet can be kept constant, the raw material dropped on the rotary table always draws the same sliding locus and is bitten by the crushing roller to ensure good crushing conditions. It

[0015]

As described above, in the present invention,
Even if there is a fluctuation in the raw material layer thickness, the behavior of the raw material that is automatically bitten into the pulverizing roller is maintained in a constant and desirable state, so that a stable supply to the pulverizing roller is achieved, the pulverizing efficiency is high, and continuous stable operation is secured. Therefore, driving operability is also improved.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a vertical crusher according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a vertical crusher according to an embodiment of the present invention.

FIG. 3 is a side view of a main part of a vertical crusher according to another embodiment of the present invention.

FIG. 4 is a plan view of a main part of a vertical crusher according to another embodiment of the present invention.

FIG. 5 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinder 3A Rotating Table 4 Grinding Roller 15 Casing 17 Raw Material Shooting Chute 30 Movable Chute 30a Discharge Port 32 Support Rod 40 Hydraulic Cylinder 42 Servo Motor 42a Gear 42b Gear 42c Bearing 42d Ball Screw Rod 50 Controller 60 Layer Thickness Sensor

Claims (1)

[Claims] 1. A plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and a predetermined crushing pressure is applied to the crushing roller by feeding the raw material supplied through a raw material chute hanging down to the upper surface of the central portion of the rotary table. In a vertical crusher that gives and crushes between the upper surface of the rotary table and the peripheral surface of the crushing roller,
A movable chute that is connected to the raw material charging chute and can move up and down in the vertical direction and an elevating means for the movable chute are provided, and the operation signal for changing the height of the lower end of the movable chute according to the fluctuation of the raw material layer thickness during operation is raised or lowered. A vertical crusher equipped with a control device that sends out means.