JP2730221B2 - Vertical crusher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical pulverizer for pulverizing cement raw materials, coal, chemicals, and the like by cooperation of a rotary table and a pulverizing roller.

[Prior Art] A vertical pulverizer having a rotary table and a pulverizing roller is widely used as a type of pulverizer that finely pulverizes and granulates particles such as cement raw materials, coal, and chemical products. This kind of crusher is press-contacted with a hydraulic pressure or the like at a lower part of a cylindrical casing, which is driven by a motor with a speed reducer and rotates at a low speed, and at a location where an outer peripheral portion of the upper surface is equally divided in a circumferential direction. And a plurality of crushing rollers that are driven and rotated.

For example, in FIG. 4 showing a conventional vertical pulverizer, a pulverizer generally denoted by reference numeral 1 is formed as a single tower in appearance, and a turntable 3 is rotated at its base by an electric motor (motor) 2. Is arranged. A plurality of conical pulverizing rollers 4 are arranged so as to rotate while being in sliding contact with the rotary table 3, and the pulverizing 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 pulverizer. The support arm 5 extends downward through the side of the casing 8 surrounding the turntable 3. , Facing the lower space of the crusher. The lower end of the support arm 5 is rotatably supported on the tip of a rod of a pressure cylinder 9 whose lower end is rotatably supported on the base of the crusher 1. Reference numeral 10 indicates coupling.

Then, from a raw material supply device (not shown), a rotary table 3
The granules as a raw material supplied by the supply pipe 11 to the center of the
It is caught and pulverized between the roller 4 and the rotary table 3 driven by the rotation of the table. On the other hand, hot air is guided into the casing 8 by a duct (not shown).
This hot air blows up from the annular space 12 between the outer peripheral surface of the turntable 3 and the inner peripheral surface of the casing 8,
The fine powder rises inside the crusher 1 while being dried, is discharged from the discharge port 13 as a mixture with hot air, and is sent to the next step.

Although some of the coarse particles also rise in the crusher 1, they are classified by the upper separator 14 and returned to the turntable 3.

The rotary table 3 has a rotary shaft (not shown) extending vertically downward, and the rotational force of the motor 2 is reduced in the casing of the speed reducer denoted by reference numeral 2A to reduce the rotational force of the rotary table 3. In addition to the speed reducer transmitting to the rotating shaft, the rotary table 3
Are provided with a thrust bearing mechanism and a radial bearing mechanism for supporting the same via the rotating shaft (both are not shown).

[Problems to be Solved by the Invention] In the vertical pulverizer, the pulverizing roller performs the pulverization by biting the raw material between the rotary table and the pulverizing roller as described above. The thickness of the raw material layer to be applied and the tension hydraulic pressure of the crushing roller on the upper surface of the rotary table are appropriate according to the properties of the raw material and the model number of the crusher (specifically, the rotary table diameter, the number of rotations, the mass of the rotary table and the crushing roller, etc.) Value must be

On the other hand, as shown in FIG. 5, what regulates the thickness of the raw material layer is an annular dam ring at the outermost periphery of the rotary table, which is higher than the table liner 3a of the rotary table 3, and which is a weir of the raw material layer to be pulverized. Was playing a role. For this reason, the raw material layer is maintained at an appropriate height, and good pulverization is ensured.

However, the table Naira 3a and the liner body of the grinding roller
4a causes a temporal change due to abrasion, the raw material layer thickness changes, and the vibration value of the pulverizer temporarily changes due to the change in the grindability due to the change in the raw material properties and the change in the biting state due to the change in the water content. The situation suddenly increases, causing adverse effects such as equipment damage, and in severe cases, an emergency stop operation must be taken.

Therefore, in order to avoid this, the supply amount of raw materials is extremely reduced, or the operation is suspended, the cooling in the mill is waited, the inside is entered, and the replacement of a dam ring consisting of a stack of a plurality of steel sheets obtained is complicated. Labor was required. Further, even if the properties of the raw material were constantly changed during the operation, the height h of the dam ring could not be freely changed in a short time.

Means for Solving the Problems In order to solve the above problems, the vertical crusher of the present invention is pivotally supported so that the upper surface is substantially horizontal, and is driven to rotate about a vertical axis by a driving device. A rotary table, a vertical pulverizer equipped with a grinding roller and a tensioning hydraulic cylinder that presses the grinding roller onto the rotary table and that is slidably disposed on the rotary table, and in which a vibrometer is mounted on a casing, An annular dam ring is vertically slidably disposed on the outermost periphery of the rotary table, and one of a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder is provided below the dam ring as a means for vertically sliding the dam ring. When a hydraulic cylinder or a pneumatic cylinder is used as the vertical sliding means, the vertical sliding means is connected to the dam ring. Power supply pipes (hydraulic pipes, pneumatic pipes) are connected to fixed pipes above the axis of the rotary table via a rotary joint, and when an electric cylinder is used as the vertical sliding means, The power wiring to the vertical sliding means is connected to a fixed wiring above the axis of the rotary table via a slider (slip ring), and the indicated value (vibration value) of the vibrometer is set in advance. A control device is provided for changing the dam ring height and the tension pressure of the tension hydraulic cylinder when the set value is exceeded.

[Operation] The vertical pulverizer of the present invention is arranged such that an annular dam ring is slidably provided on the outer periphery of a rotary tail bull in a vertically slidable manner, and a vertical slidable means is provided. Equipped with control device to change height and tension hydraulic pressure. Therefore,
When the vibration value of the crusher exceeds a predetermined value, the vibration can be changed by changing the height of the dam ring and the tension oil pressure of the crushing roller during operation to change the auxiliary variable defining the vibration value. The vibration value can be reduced by deviating from the resonance region.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 3 show one embodiment of the present invention, FIG. 1 is an enlarged longitudinal sectional view of a main part, and FIG. 2 is a plan view taken along the line II-II of FIG. FIG. 3 is a block diagram of a control device for changing the dam ring height and the tension hydraulic pressure.

In the figure, 3 is a rotary table, 3a is a table liner, 3b is a liner holder, 3c is a dam ring, 3d is a cover,
Is a grinding roller, 4a is a roller body, 4b is a rotating shaft, 50 is a hydraulic cylinder, 50a is a piston rod, 50b is a hydraulic pipe, 50c
Is a header, 50d is a quick coupling (pipe fitting), 50e is a hydraulic pipe, 50f is a pipe fitting, 51 is a support,
60 is hydraulic piping (fixed), 60a is piping protection tube (fixed), 6
0b is Jinkasa. H is the thickness of the raw material layer, h is the height of the dam ring, and l is the distance (gap) between the inner end face of the dam ring and the outer diameter of the roller body 4a.

The dam ring 3c has an annular shape, and is fitted on the outer periphery of the turntable 3 and is provided with four hydraulic cylinders 50 fixed to a support 51 attached to the lower side of the turntable 3.
And is configured to be slidable in the vertical direction. As shown in FIG. 2, the upper and lower hydraulic pipes 50b of the hydraulic cylinder 50 are connected to the header 50c at an intermediate position between the two adjacent hydraulic cylinders 50, 50, and furthermore, the hydraulic pipes provided along the axis of the rotary table. Quick coupling (pipe fitting) 50b at top of liner retainer 3b of rotary table 3 via 50e, pipe joint 50f, hydraulic pipe 50g
, And connected to a pipe 60 from a hydraulic unit (not shown) outside the mill, so that the vertical movement of the piston rod 50a of the hydraulic cylinder 50 can be controlled.

Further, in order to detect the height of the dam ring 3c, a potentiometer (not shown) or another non-contact type position sensor (for example, a magnetic scale) is provided in the vertical grinder,
Monitoring can be done in a remote control room.

With the above-described configuration, the dam ring height h is increased in accordance with fluctuations in the operating load and raw material properties (grindability), wear of roller tires, table liners, and the like, and changes in the crushing conditions such as changes in crushed raw materials. When it is desired to change the dam ring 3c to an appropriate value, the height of the dam ring 3c can be changed to an arbitrary position up and down by operating the hydraulic unit promptly as needed during operation.

Instead of the hydraulic cylinder, a pneumatic cylinder or an electric cylinder can be used, and the dam ring can be moved up and down by connecting pneumatic pipes and electric wires, as in the case of the hydraulic cylinder. A slider (slip ring) mechanism can be used to connect the rotating part of the electric wiring to the fixed electric wiring.

Next, when the indicated value (vibration value) of the vibrometer attached to the crusher exceeds a preset value, the dam ring height and the tension pressure of the hydraulic cylinder pressing the crush roller against the rotary table surface are changed. A control device for performing this will be described with reference to FIG.

FIG. 3 is a block diagram illustrating a control system of the control device.

In normal stable operation, the vibration value attached to the casing of the crusher is 30 to 50 μ with a single amplitude, but the crushing conditions described above (model number, number of rotations of the rotary table, mass of the rotary table and the crushing roller, properties of the raw material, Due to certain combinations of water content, raw material layer thickness, tension hydraulic pressure, etc.), the mill vibration system entered the resonance region, causing severe vibration with a vibration value exceeding 100 μm, which could result in equipment damage or inoperability. In order to avoid such a situation, as shown in FIG. 3, a vibration value, which is sent from a vibrometer every moment, is compared with a vibration value (for example, 100 μ) set in a setting device in advance by a converter. Instead of an electric signal, a comparison is made by a comparator, and when the set value is exceeded, a change command is transmitted to each drive device to change the dam ring height and the tension oil pressure via the controller. The controller consists of an adjuster and an operating device. The adjuster instructs the height of the dam ring and the width of increase / decrease in tension oil pressure according to the way the vibration value exceeds the set value. (P operation), integration operation (I operation), differentiation operation (D operation), proportional integration operation (PI operation), proportional differentiation operation (PD operation), proportional integration differentiation operation (PID operation), etc. Can be used properly. The operation device transmits an operation command to each drive device based on an instruction from the controller. A line with an arrow in the drawing indicates a signal flow.
In this way, after a certain time elapses by the timer after the operation is changed, the vibration value obtained by the vibrometer is compared again with the set value, and this operation is repeated until the vibration value falls within the set value. By the movement control having the feedback mechanism as described above, even if the vehicle temporarily falls into a vibrating state due to some disturbance during driving, it is possible to easily escape from this state.

In addition, when the dam ring height is increased, the tension hydraulic pressure is increased in proportion to this at the same time, but if the vibration value can be reduced by changing only the dam ring height, the tension hydraulic pressure is dared. You do not need to change.

[Effects of the Invention] The present invention has a configuration in which the height of a dam ring can be moved up and down during operation, and a control device that controls a vibration value by a vibrometer of a crusher as a control amount is provided. By changing the hydraulic pressure, these can be calmed down when the vibration value of the crusher is abnormally large, so during operation,
Even if the vibration value increases with a change in the properties of the raw materials, this is eliminated and long-term continuous stable operation can be continued, so that the productivity is improved and the maintainability is improved.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is an enlarged longitudinal sectional view of a main part, FIG. 2 is a plan view taken along the line II-II of FIG. 1, and FIG. It is a block diagram. 4 to 5 show an embodiment of a conventional vertical pulverizer. FIG. 4 is an overall longitudinal sectional view, and FIG. 5 is an enlarged longitudinal sectional view of a main part. 1 Vertical crusher, 3 Rotary table, 3a Table liner, 3b Liner retainer, 3c Dam ring, 3d Cover, 4 Roller, 4a Roller body, 4b …… Rotary shaft, 9… Hydraulic cylinder (for tensioning crushing roller), 50 …… Hydraulic cylinder (for dam ring up / down), 50a …… Piston rod, 50b …… Hydraulic piping, 50c …… Header, 50d …… Quick Coupling (rotary joint), 50e… Hydraulic piping, 50f …… Piping joint, 50g …… Hydraulic piping, 51 …… Support, 60 …… Hydraulic piping (fixed), 60a …… Protective tube (fixed), 60b… ... Jinkasa, H ... Raw material layer thickness, h ... Dam ring height, l ... Gap.

Claims (1)

(57) [Claims] 1. A rotary table which is pivotally supported so that its upper surface is substantially horizontal and is driven to rotate about a vertical axis by a driving device, a crushing roller slidably disposed on the rotary table, and the crushing roller. In a vertical pulverizer equipped with a tension hydraulic cylinder that is in pressure contact with the rotary table and a vibrometer is mounted on a casing, an annular dam ring is disposed on the outermost periphery of the rotary table so as to be slidable in the vertical direction. Any one of a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder is disposed below the dam ring as a means for vertically sliding the dam ring, and is connected to the dam ring. When a hydraulic cylinder or a pneumatic cylinder is used as the moving means, a power supply pipe (a hydraulic pipe or a pneumatic pipe) to the vertical sliding means is connected to the axis of the rotary table. In the case where an electric cylinder is used as the vertical sliding means, the power wiring to the vertical sliding means should be connected to the upper fixed pipe via a rotary joint above the axis of the rotary table. When the indicated value (vibration value) of the vibrometer exceeds a preset value, the dam ring height and the tension hydraulic cylinder are connected. Vertical crusher equipped with a control device for changing the tension pressure of the crusher.