JPH05252A - Vertical-type crusher - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a vertical crusher capable of immediately responding to a change in water content of a feed material and deterioration of roller entrapment due to deterioration of pulverizability and friction coefficient. [Structure] A constant feed wear 80 for quantitatively supplying the raw material from the raw material hopper 70 to the vertical crusher 1 is provided, and a water content measuring device 132 for measuring the water content of the raw material during transportation, a water sprinkler 138, and control of the amount of water sprinkled. The humidity control device 130 including the device 134 is arranged in the constant feed ware 80.

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 limestone, slag, clinker, cement raw materials and chemicals in cooperation with a rotary table and a pulverizing roller.

[0002]

2. Description of the Related Art As a kind of crusher for finely crushing raw materials such as limestone, slag, and cement raw material into powder,
As shown in the figure, a vertical crusher 1 having a rotary table and a crushing roller is widely used. This type of crusher has a disk-shaped rotary table 3A that is driven by a speed reducer 2 by a motor 2A and rotates at a low speed in a lower portion of a cylindrical casing 15, 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 against each other.

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 pivotally supported by a shaft 15 by a shaft 6, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the raw material layer pressure, 14 is a gas blowing annular space passage around the rotary table 3A, 14A is a gas supply passage, and 13 is raw material crushed by the 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 charging chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. At times, the rotary table 3A receives a force in the rotation direction, and the rotary table 3A
It slides with A and performs 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 the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten. It is crushed and crushed.

On the other hand, at the base of the casing 15, gas such as air or hot air is introduced by a duct,
This gas blows up from the annular space portion 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, so that the pulverized fine powder is entrained in the gas and the casing 1
5, the blade 1 of the separator 13 that is located in the upper part
The product having a predetermined particle size is subjected to the classification action by 3A and is discharged together with the gas from the discharge port 16 and sent to the next step.

[0006]

In the conventional vertical crusher as described above, a considerable amount of the material to be crushed reaching the biting side of the crushing roller is bitten by the crushing roller on the table. It is normal for it to be washed away into the annular space. Then, among the objects to be crushed that are pushed into the annular space on the biting side of the crushing roller, those with a large particle size become stones and fall into the annular space to increase the amount of stones and increase the amount of processing work. Increase. Further, among the objects to be crushed that have been swept into the annular space, those having a small particle size are scattered again, so that the load applied to the separator is increased and the classification efficiency is likely to be lowered. Further, a large amount of the object to be crushed is forced to flow into the annular space portion, which increases the ventilation pressure loss in the annular space portion, thereby increasing the fan power.

Further, in order for the raw material dropped on the rotary table 3A of the crusher to be successfully brought into contact with the crushing roller 4 and to be bitten, the raw material must have an appropriate friction coefficient, and the surface is smooth and smooth. In the case of a raw material having a property having a small friction coefficient, even if the pulverizing roller 4 is strongly pressed toward the rotary table 3A, the raw material interposed between the two cannot escape to the side and an effective pulverizing force cannot be applied to the raw material. Since a raw material having a small wear coefficient generally has a low water content, the wear coefficient must be increased by adjusting the water content of the raw material to an appropriate value in advance. Of these raw materials with low water content and low friction coefficient, especially when ultra-finely pulverizing a raw material with relatively poor grindability, mill vibration often occurs and the vibration value (amplitude) Especially in the case of a large machine, the equipment may be damaged or the vehicle may become inoperable and the operation may be stopped without stopping.

Therefore, as a countermeasure against the occurrence of a large vibration, in order to move away from the resonance region by changing the frequency of the raw material layer of the crushing part, the table weir height (dam ring height), It is conceivable to change the crushing pressure and table rotation speed by changing them. Of these, changing the rotary table drive device is too expensive to implement and the feasibility is low. The internal work after stopping the operation of the crusher is required to change the value), and when the crushing pressure is changed, the product particle size changes to the desired one. The actual situation was to deal with it, and it was to impair a stable production plan. Therefore, even if mill vibration occurs, the vibration frequency of the pulverized raw material layer is changed to reduce the vibration amplitude and the normal stable operation with less vibration is quickly restored without any significant reduction in the mill throughput. The means were hungry. The generation of these vibrations tended to occur more frequently in the fine crushing or ultra fine crushing than in the intermediate crushing region.

[0009]

In order to solve the above-mentioned problems, the vertical crusher of the present invention has a plurality of rotatable crushing rollers arranged on the upper surface of the outer peripheral portion of a rotary table and supplies the crushing roller to the center of the rotary table. In a vertical crusher that applies a predetermined crushing pressure to the crushing roller and crushes it between the upper surface of the rotary table and the peripheral surface of the crushing roller, a constant feed ware that supplies the crusher with a constant amount of the raw material from the material hopper is used. A water content measuring instrument that is provided in the constant feed ware and measures the water content of the raw material during transportation, and a water sprinkler that increases or decreases the amount of water depending on the measured value of the water content of the raw material by the water content measuring instrument. A humidity control device including a water amount control device was provided.

[0010]

In the vertical crusher of the present invention, the moisture content of the raw material being transported is measured every moment by the moisture measuring device provided in the constant feed ware for feeding the raw material, and it is determined in advance according to the type of raw material. When the range of the proper contained water is exceeded, a command is issued from the controller to similarly increase / decrease the amount of water sprayed by the sprayer provided directly above the constant feed ware to control the amount of water sprayed on the raw material. In this way, by feeding the raw material whose moisture content has been adjusted to the proper level into the crusher, the crushing efficiency is improved, and the mill vibration is reduced to continue stable operation.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 relate to an embodiment of the present invention,
FIG. 1 is a flow sheet, and FIG. 2 is a control block diagram of the humidity control apparatus. In the figure, 1 is a vertical crusher, 60 is a raw material conveyor, 70 is a raw material hopper, 80 is a constant feed wear, 90 is a dust collector, 100 is a suction fan, 1
10 is a stone unloading conveyor, 120 is a bucket elevator, 1
Reference numeral 30 denotes a humidity controller, which is a moisture measuring device 132 and a controller 1.
34, a flow rate adjusting valve 136, and a spray device 138.

As shown in FIG. 2, the controller 134 is composed of a controller including a setter, a comparator, a controller and an operating unit, and an amplifier. The converted and transmitted information is compared by a comparator against the proper moisture value set by a preset device,
When the set value is exceeded, the spray device 1 is sent via the controller.
The amount of water spray is increased or decreased by adjusting the valve opening degree of the flow rate adjusting valve 136 of No. 38. The controller is composed of a controller and a controller. The controller directs the increase / decrease range of the sprinkling amount according to how the measured value of the water content in the raw material exceeds the set value. (P action), integral action (I action), derivative action (D action), proportional-integral action (PI action), proportional-derivative action (PD action), and the like can be used depending on the situation of the change of the raw material moisture.

The operating device transmits an operation command to the flow rate adjusting valve 136 based on the instruction from the adjusting device. The lines with arrows in the figure show the flow of signals. In this way, after the operation is changed and a certain time elapses by the timer, the moisture measurement value by the moisture measuring device 132 is again compared with the set value, and this operation is repeated until the value falls within the set value. The set value of water content is
For example, it is convenient to set the width in the range of 0.8 to 3% for crushing limestone and 0.5 to 2% for low moisture contents such as clinker and slag. As the moisture measuring instrument 132, a commercially available laser emission type instrument can be used. Moisture content of up to 3% can be sufficiently dried by crushing heat and heat from a suction fan. If the water content is 3% or more, the crushing efficiency will be adversely affected, so the maximum should be 3%. The moisture measuring instrument 132 applies the principle that a specific wavelength of light is absorbed by moisture, for example,
An infrared reflection type or infrared transmission type moisture meter can be used.

By performing the automatic control having the feedback mechanism as described above, the water content of the feed material suddenly decreases (or increases) during operation, and the pulverization efficiency decreases, or the biting becomes worse. Even if the vibration value is increased, the water content of the raw material is improved by the above operation, the biting of the raw material is improved again due to the increase of the friction coefficient, and the original stable operating state can be restored.

[0015]

As is apparent from the above description, in the vertical crusher of the present invention, the water content of the feed material is maintained at an appropriate preset value by water spraying by the spray device, so that the material is crushed. Good biting into the roller can be maintained. Therefore, the crushing efficiency is improved,
It is possible to suppress the occurrence of abnormal vibrations and prevent product coarsening and performance deterioration.

[Brief description of drawings]

FIG. 1 is a flow sheet of a vertical crusher showing an embodiment of the present invention.

FIG. 2 is a control block diagram of the humidity control apparatus of the vertical crusher according to the embodiment of the present invention.

FIG. 3 is an overall vertical cross-sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical grinding machine 3A Rotary table 4 Grinding roller 17 Raw material chute 60 Raw material conveyor 70 Raw material hopper 80 Constant feed wear 90 Dust collector 100 Suction fan 110 Exhaust stone conveyor 120 Bucket elevator 130 Humidifier 132 Moisture meter 134 Control Device 136 Flow control valve 138 Spray device (sprinkler)

Claims (1)

Claim: What is claimed is: 1. A plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of a rotary table, and the raw material supplied to the center of the rotary table is rotated by applying a predetermined crushing pressure to the crushing roller. A vertical crusher for crushing between the table top surface and the peripheral surface of the crushing roller is equipped with a constant feed ware that supplies the raw material from the raw material hopper to the crusher in a fixed amount, and is disposed in the constant feed ware during transportation. A water content measuring device for measuring the water content of the raw material, and a humidity control device comprising a water sprinkler in which the water sprinkling amount is increased / decreased according to the measured value of the water content in the raw material by the water content measuring device and a water sprinkling amount control device. Vertical crusher characterized by.