JP7043905B2 - How to operate the vertical crusher and the vertical crusher - Google Patents

Description

The present invention mainly relates to a vertical crusher suitable for crushing coal, oil coke, slag, clinker, limestone, other inorganic raw materials, and organic raw materials such as biomass, and is particularly suitable for finely pulverizing raw materials. Regarding a vertical crusher.

Conventionally, a crusher called a vertical crusher (sometimes referred to as a vertical mill or a vertical roller mill) has been widely used as a device for crushing coal or the like.
While the vertical crusher has the excellent property of being able to pulverize raw materials efficiently, it has the problem that abnormal vibration may occur depending on the type of raw material and crushing conditions. Was. Since the abnormal vibration generated in the vertical crusher is induced by various causes, it is necessary to take various measures according to the cause of the vibration. Therefore, many measures to prevent abnormal vibration have been proposed for vertical crushers.

The types of vibration generated in the vertical crusher are "impact vibration" generated by the impact when the crushing roller hits the stopper or crushing the raw material, and "self-excited vibration" in which the vertical crusher resonates and vibrates violently. Is well known. In particular, regarding self-excited vibration, once the vibration value (sometimes referred to as an amplitude value in the present application) becomes large, it is difficult to suppress the vibration and it is often difficult to deal with it, so it tends to be a problem.

Self-excited vibration is a phenomenon in which the ratio ω / ω0 of the excitation frequency ω and the natural frequency ω0 approaches 1 and the vibration is amplified many times. A reference diagram regarding the vibration magnification is shown in FIG. To converge this phenomenon, it is necessary to change ω or ω0 to remove ω / ω0 from 1.

The natural frequency ω0 is due to the mill structure and is difficult to change during operation. On the other hand, the vibration frequency ω is determined by the rotation speed of the crushing roller and the like. Therefore, for example, if the rotation speed of the crushing roller is changed by changing the rotation speed of the rotary table, a certain effect can be expected to improve the self-excited vibration.

Patent Document 1 discloses a technique of attaching a damper and a spring to a swing lever to prevent the swing lever from swinging back. The invention disclosed in Patent Document 1 is a technique whose main purpose is to prevent a problem (so-called metal touch) in which a crushing roller and a rotary table come into direct contact with each other. However, it is considered that the configuration in which the damper is arranged on the swing lever suggested in one of the cases can be expected to have a certain effect on vibration suppression.

JP 2011-183344

As described above, if the rotation speed of the rotary table is changed to change the rotation speed of the crushing roller, it is considered that a certain effect can be expected to improve the self-excited vibration. However, in order to change the rotation speed of the rotary table during operation, it is necessary to prepare equipment such as an inverter. A vertical crusher often uses a large electric motor, and generally, since it is a large-scale equipment, there is a problem that the cost may increase and the equipment may become large.

In addition, there are cases where the rotation speed of the rotary table cannot be changed depending on the operating conditions of the vertical crusher or the purpose of crushing, and a self-excited vibration damping method that can handle such cases is required. Was there.

Regarding the invention disclosed in Patent Document 1, it is presumed that it is difficult to suppress vibration once the ratio ω / ω0 of the vibration frequency ω and the natural frequency ω0 approaches 1 and the self-excited vibration becomes large. Will be done.

The present invention has been made in view of the problems described above, and is a vertical mold suitable for efficiently crushing raw materials by effectively preventing abnormal vibration due to self-excitation with a simple facility. Regarding the operation method of the crusher and the vertical crusher.

In order to achieve the above-mentioned object, the operation method of the vertical crusher according to the present invention is:
(1) In the operation method of a vertical crusher that crushes the raw material put on the rotary table by a crushing roller supported by a swing lever.
A vibration sensor for measuring vibration is placed in the casing of the vertical crusher, and a hydraulic cylinder is connected to the lower arm part of the swing lever that rotates while being pivotally supported by the casing of the vertical crusher. A crushing roller is attached to the crushing roller, and a damping coefficient adjustment type damper that is attached to the casing of the vertical crusher and expands and contracts with respect to the rotation direction of the swing lever to suppress the rotation of the swing lever is arranged. A control device that changes the damping coefficient of the damper based on the measured value of the vibration sensor is provided, and the control device controls the viscous damping coefficient of the damper that suppresses the rotation of the swing lever to be low under normal conditions, and measures the vibration. When the value increases and the measured value of the vibration sensor exceeds the preset value, the instruction to increase the viscous damping coefficient is commanded, and the damping coefficient is changed to increase the damping ratio to suppress self-excited vibration. It was characterized by that.

Further, in order to achieve the above-mentioned object, the vertical crusher according to the present invention can be used.
(2) In a vertical crusher that crushes raw materials put on a rotary table with a crushing roller supported by a swing lever, a vibration sensor that measures vibration is placed in the casing of the vertical crusher, and the vertical crusher A hydraulic cylinder is connected to the lower arm part of the swing lever that is pivotally supported by the casing and rotates, and a crushing roller is attached to the upper arm part. On the other hand, the control device is equipped with a damping coefficient adjustment type damper that suppresses the rotation of the swing lever by expanding and contracting , and also has a control device that changes the damping coefficient of the damper based on the measured value of the vibration sensor. Under normal conditions, the viscous damping coefficient of the damper that suppresses the rotation of the swing lever is controlled to be low, and when the measured value of vibration increases and the measured value of the vibration sensor exceeds a preset value, the viscous damping coefficient. A control device that suppresses self-excited vibration by instructing an increase instruction and changing the damping coefficient to increase the damping ratio. The damper is a cylindrical damper attached by screwing it to a support member. It is arranged in the case and is screwed and attached to the side surface portion formed on the anti-swing lever side of the damper case, and the tip of the damper on the swing lever side abuts on the swing lever or is attached to the swing lever.

(3) In the vertical crusher according to (2), a spring is arranged inside the damper case and expands and contracts with respect to the rotation direction of the swing lever.

According to the present invention, it is possible to suppress self-excited vibration with a simple configuration device.

It is a conceptual diagram explaining the relationship between the structure of a damper system and a control device which concerns on this embodiment. It is a conceptual diagram explaining the whole structure of the vertical crusher which concerns on this embodiment. It is a figure which conceptually explains the vibration model of a vertical crusher. It is a reference figure explaining self-excited vibration.

Hereinafter, an example of a preferred embodiment of the present invention will be described in detail with reference to the drawings and the like.
1 and 2 are conceptual diagrams related to the present embodiment, FIG. 1 is a conceptual diagram for explaining the relationship between the configuration of the damper system and the control device, and FIG. 2 is a conceptual diagram for explaining the overall configuration of the vertical crusher. FIG. 3 is a diagram conceptually explaining a vibration model of a vertical crusher.

Hereinafter, an example of a preferable configuration of the vertical crusher 1 according to the present invention will be described.
As shown in FIG. 2, the vertical crusher 1 used in the present embodiment includes an upper casing 1B, a lower casing 1A, and a vertical crusher 1 that form a casing that is an outer shell of the vertical crusher 1. It includes a speed reducer 2B installed at the bottom, a rotary table 2 driven by a drive motor 2M, a casing type crushing roller 3, and the like.

The vertical crusher 1 is provided with a rotary classifier 14 above the rotary table 2. Briefly explaining the classifier 14, the rotary classifier 14A arranged above the rotary table 2 is driven by a drive motor (not shown) installed above the vertical crusher 1 and rotates freely. It has become.

Further, in the vertical crusher 1, a gas supply port 33 for introducing gas is provided below the rotary table 2, and an upper outlet 39 for taking out the product together with the gas is further provided above the rotary table. ing. The vertical crusher 1 according to the present embodiment passes through the classifier 14 from below the rotary table 2 to the upper outlet by introducing gas (air in the present embodiment) from the gas supply port 33 during operation. The structure is such that an air flow of gas flowing to 39 is generated.

The raw material crushed on the rotary table 2 is blown up by the gas, rises in the casing, and flows in the direction of the classifier 14, but the raw material having a large diameter and a large weight cannot reach the classifier 14. Alternatively, by falling without passing through, it becomes a circulating raw material that circulates in the vertical crusher 1 and is crushed again. Then, the raw material having a small diameter that has passed through the classifier 14 is taken out as a product from the upper outlet 39. Further, the vertical crusher 1 shown in FIG. 2 is provided with a discharge port 34 at the lower part, in which a large raw material that could not be crushed is dropped under the rotary table 2 and taken out.

The crushing roller 3 is configured such that a plurality of (two in the present embodiment) are arranged on the upper surface of the rotary table 2 (sometimes referred to as the rotary table upper surface 2A) and pressed in the direction of the rotary table 2. ing. Further, two crushing rollers 3 are arranged on the rotary table 2 so as to face each other on the outer peripheral portion thereof. As the rotary table 2 rotates, the crushing roller 3 is driven by the rotary table 2 via the raw material and rotates.

In the present embodiment, as shown in FIG. 2, the crushing roller is formed on the swing lever upper arm portion 6A (sometimes referred to as the upper arm 6A), which is the upper portion of the swing lever 6 pivotally supported by the bearing portion 7 of the lower casing 1A. 3 was arranged, and the piston rod 8A of the hydraulic cylinder 8 was connected to the swing lever lower arm portion 6B (sometimes referred to as the lower arm 6B) corresponding to the lower portion.

Details will be described later, but in the present embodiment, as shown in FIG. 1, a damper case 53 is attached to the outer peripheral side of the lower arm 6B of the swing lever 6 as a support member to which the lower casing 1A is fixed, and a damper is used. The system 50 is arranged.

Hereinafter, the configuration and arrangement of the damper system 50 will be described with reference to FIG. 1. The damper system 50 according to the present embodiment includes a damping coefficient adjustable damper 51, a cylindrical damper case 53, a spring 55, and the like. There is. In the present embodiment, as the damper 51, a viscous damping coefficient adjustment type capable of controlling and changing the damping coefficient from the outside and a type in which the rod protrudes from the cylinder portion and can expand and contract are used.

In this embodiment, a signal line extending from the damper 51 to the terminal L1 of the attenuation coefficient control device G installed outside the machine is arranged so that the attenuation coefficient can be adjusted remotely from the attenuation coefficient control device G. .. In the present embodiment, as a method for adjusting the damping coefficient of the damper 51, a type in which the flow path area is changed by an oil type is used. Further, the damper 51 is a type in which the rod protrudes from the cylinder portion and expands and contracts, and the length can be extended by the stroke of the rod from the state in which the rod is pulled into the cylinder portion and contracted.

There are various methods for adjusting the damping coefficient related to the damper, and there are many publicly known techniques widely used for shock absorbers of automobiles and the like. The method of adjusting the damping coefficient applicable to the present invention is not limited to that of the above-described embodiment, and may be, for example, a gas type, a known damper can be used, and changes can be made without departing from the technical idea of the present invention. It is possible.

Next, how to attach the damper system 50 and the like will be described in detail.
A hole for mounting the damper case 53 is formed on the outer peripheral side of the lower arm 6B of the lower casing 1A, and threaded (female screw) parts or the like are fixed to form the case mounting portion 53B. Then, the damper case 53 is screwed and attached to the case mounting portion 53B by screwing (male screwing) on the outer peripheral side of the cylindrical damper case 53.

Further, a side surface portion is formed on the anti-swing lever side of the damper case 53 attached to the lower casing 1A, and a screw is processed (female screw) on the inner peripheral side of the hole formed in the side surface portion to form a first damper mounting portion 53A. And. Then, a part of the outer circumference of the columnar damper 51 on the large diameter side (cylinder portion side) is threaded, and the damper 51 is screwed and attached to the first damper mounting portion 53A.

The damper 51 is arranged so as to extend in the direction of the lower arm 6B. The swing lever side tip (rod tip side) of the damper 51 is arranged so as to extend toward the pedestal 70 side installed on the outer peripheral side of the lower arm 6B. The tip of the damper 51 on the swing lever side is pivotally supported by a pin at the second damper mounting portion 70A, and is rotatably mounted in the rotation direction of the lower arm 6B.

In this embodiment, the tip of the damper 51 on the swing lever side is attached to the pedestal 70 of the lower arm 6B. However, the configuration applicable to the present invention is not limited to the embodiment, and can be changed without departing from the technical idea of the present invention. For example, even if the tip of the damper 51 on the swing lever side and the lower arm 6B are in contact with each other or separated from each other by the rotation of the swing lever 6, the tip of the damper 51 on the swing lever side and the lower arm 6B are in contact with each other or separated from each other. It suffices to have a configuration such that the damper 51 expands and contracts when abutting against each other to suppress the rotation of the swing lever 6 and perform the damper function.

Further, in the present embodiment, the spring 55 is further arranged inside the damper case 53. The spring 55 extends from the side surface of the damper case 53 to the pedestal 70 in the direction of the lower arm 6B, and is arranged so that the damper 51 extends through the spirally wound spring 55. ..

According to the above-described configuration, the damper system 50 according to the present embodiment adjusts the distance from the side surface portion of the damper case 53 to the pedestal 70 by rotating the damper case 53 attached to the case mounting portion 53B, and the reaction force of the spring 55. Can be adjusted.

Further, in the damper system 50 according to the present embodiment, the relative positions of the damper 51 and the damper case 53 can be changed by further rotating the damper 51 attached to the first damper mounting portion 53A.

For example, assuming that the damper case 53 is rotated to shorten the distance from the side surface portion of the damper case 53 to the pedestal 70 in order to increase the reaction force by the spring 55, the damper 51 has a relatively lower arm. It will approach the 6B direction.

If the damper 51 is relatively close to the lower arm 6B, the spring 55 is compressed and the reaction force becomes stronger, and at the same time, the length of the damper 51 becomes shorter. The position can be adjusted by rotating the damper 51 attached to the damper mounting portion 53A and relatively separating the damper 51 from the lower arm 6B direction.

That is, in the present embodiment, the separation distance between the damper case 53 and the lower arm 6B and the separation distance between the damper 51 and the lower arm 6B can be individually adjusted. In this adjustment function, as a result of adjusting the reaction force of the spring 55, the stroke amount of the damper 51 cannot be secured because the distance between the damper case 53 and the lower arm 6B is too close or too far. It is effective in.

In this embodiment, the damper system 50 is arranged with the lower casing 1A as a support member. However, the configuration of the support member applicable to the present invention is not limited to this, and other structures may be used as the support member. For example, when a part of the swing lever 6 is outside the vertical crusher 1, a structure such as a steel or concrete support is provided on the outer peripheral side of the vertical crusher 1. It is preferable to arrange them to form a support member.

Hereinafter, the swing lever stopper 60 will be described. The swing lever stopper 60 according to the present embodiment is composed of a stopper spindle 61 (sometimes referred to as a spindle 61), a stopper handle 61A (sometimes referred to as a handle 61A), and the like.

In the present embodiment, a spindle 61 that moves back and forth in the lower arm 6B direction is arranged below the damper system 50. As shown in FIG. 1, a cylindrical stopper mounting case 63 is arranged in a hole formed in the lower casing 1A, and a screw is processed (female screw) on the inner peripheral side of the stopper mounting case 63 to form a stopper mounting portion 63B. And. Then, a screw is processed (male screw) on the outer peripheral side of the cylindrical spindle 61, and the spindle 61 is screwed and attached to the stopper mounting portion 63B.

A handle 61A for rotating the spindle 61 is installed at the end of the spindle 61 on the anti-swing lever side. Therefore, if the handle 61A is rotated to rotate the spindle 61, the spindle 61 can freely move forward and backward toward the lower arm 6B side. That is, when the handle 61A is rotated to rotate the spindle 61, the spindle 61 moves back and forth with respect to the swing lever 6 direction to change the separation distance from the pedestal 70. The main purpose of moving the spindle 61 back and forth toward the lower arm 6B is to limit the movement of the lower arm 6B portion to prevent the problem of contact between the crushing roller 3 and the rotary table 2 (so-called metal touch). Is.

In the present embodiment, when the lower arm 6B rotates toward the swing lever stopper 60 due to the rotation of the swing lever 6, the crushing roller 3 moves so as to be pressed against the rotary table 2 side. There is. Therefore, when the spindle 61 comes into contact with the pedestal 70, the swing lever 6 cannot rotate any further. When the rotation of the swing lever 6 is stopped, the lowering of the crushing roller 3 is stopped and it becomes impossible to move to the rotary table 2 side.
Therefore, according to the present embodiment, by changing the separation distance between the spindle 61 and the pedestal 70, it is possible to secure a separation distance at which the crushing roller 3 and the rotary table 2 do not come into contact with each other.

Hereinafter, the functions of the damper system 50 will be described. As the first adjustment function of the damper system 50, the reaction force of the spring 55 can be adjusted to adjust the force (crushing roller pressing pressure) for pressing the crushing roller 3 against the rotary table 2 by the swing lever 6.

The first adjustment function will be described.
As described above, by rotating the damper case 53, the damper case 53 moves back and forth with respect to the lower arm 6B direction to expand and contract the internal spring 55.

During operation, the lower arm portion 6B moves back and forth toward the damper system 50 side in accordance with the rotation of the swing lever 6. If the distance between the damper system 50 and the pedestal 70 is shorter than the natural length of the spring 55, the spring 55 will be sandwiched between the side surface of the damper case and the pedestal 70 and compressed, resulting in compression. As a spring 55, the reaction force is exerted by the amount of the spring 55.

The force of the swing lever 6 being pushed back by the reaction force of the spring 55 acts in a direction of weakening the force of pressing the crushing roller 3 against the rotary table 2. Therefore, if the damper system 50 according to the present embodiment is used, the expansion / contraction state of the spring 55 can be changed by rotating the damper case 53, and as a result, the crushing roller 3 is moved to the rotary table 2 by the swing lever 6. The pressing force can be adjusted.

Further, according to the damper system 50 according to the present embodiment, as a second adjustment function, the relative positions of the damper 51 and the damper case 53 can be changed by rotating the damper 51.

For example, in a case where the damper case 53 is rotated so as to be relatively close to the lower arm 6B, if the amount of extension due to the stroke of the damper 51 is the same as before the adjustment, the damper 51 is rotated. The damper 51 can be adjusted by relatively separating the damper 51 in the direction of the lower arm 6B.

It should be noted that the model of the vertical crusher 1 that can be used in the present embodiment is not limited to the above-mentioned one, and can be changed without departing from the technical idea of the present invention.

Further, in the present embodiment, a vibration sensor S1 for measuring the vibration generated in the vertical crusher 1 is installed, and the measured value of the vibration by the vibration sensor S1 is input to the damping coefficient control device G. ing. Although the details will be described later, the damping coefficient control device G is configured to change the damping coefficient of the damper 51 when the measured value of the vibration sensor S1 exceeds the threshold value by using a preset vibration value as a threshold value. ..

Hereinafter, a preferable example of the operation method of the vertical crusher 1 according to the present embodiment will be described. The raw material (coal in this embodiment) charged into the raw material charging port 35 of the vertical crusher 1 is charged near the center of the rotary table via the raw material charging chute 13, while drawing a spiral locus. Move to the outer peripheral side of the rotary table.

The raw material charged on the rotary table is combined with the circulating raw material described later on the rotary table 2, and most of the raw material is bitten by the rotary table 2 and the crushing roller 3 and crushed again. Then, the raw material bitten and crushed by the rotary table 2 and the crushing roller 3 gets over the dam ring provided around the outer edge portion of the rotary table 2 and becomes the outer peripheral portion of the rotary table upper surface 2 and the lower casing 1A. Head to the annular passage (sometimes called the annular space), which is a gap.

The raw material that has reached the annular passage is blown up by the gas and rises in the casing and tries to flow in the direction of the classifier 14, however, the raw material having a large diameter and a large weight cannot reach the classifier 14. Alternatively, by falling inside the machine without passing through the classifier 14, it becomes a circulating raw material that circulates in the vertical crusher 1 and is repeatedly crushed. It should be noted that a very small part of the large raw material falls to the lower side of the rotary table 2 and is taken out of the machine from the discharge port 34.

The circulating raw material is repeatedly supplied onto the rotary table until it has a predetermined particle size and is discharged to the outside of the machine, and is re-engaged between the rotary table 2 and the crushing roller 3 to be crushed. On the other hand, the raw material crushed to a predetermined particle size reaches the classifier 14 and passes therethrough, and is taken out as a crushed product from the upper outlet 39.

In the present embodiment, the pressure for pressing the crushing roller 3 against the rotary table 2 changes due to the reaction force of the spring 55. Therefore, the force for pressing the crushing roller 3 against the rotary table 2 can be adjusted in real time according to the thickness of the raw material layer, and crushing can be performed with the pressing force of the crushing roller 3 suitable for the thickness of the raw material layer. Is.

Further, according to the vertical crusher 1 according to the present embodiment, the pressing force of the crushing roller 3 naturally changes and increases / decreases in accordance with the change in the thickness of the raw material layer. Therefore, there is no delay due to control, and there is no mistake in prediction. Therefore, in particular, even when the thickness of the raw material layer changes repeatedly in a short cycle, it is possible to reliably suppress the abnormal vibration in response to the change.

Here, for example, when the thickness of the raw material layer changes due to some influence during operation, the frequency of vibration generated by the vertical crusher 1 changes, and the ratio of the vibration frequency ω to the natural frequency ω0. Assuming a case where ω / ω0 approaches 1, it is assumed that the self-excited vibration becomes large due to resonance.

In this embodiment, the vibration during operation is constantly measured by the vibration sensor S1. The measured value of the vibration measured by the vibration sensor S1 is transmitted to the damping coefficient control device G and input. The damping coefficient control device G compares the preset vibration threshold value with the measured value, and changes the damping coefficient of the damper 51 so as to converge the self-excited vibration due to resonance when the measured value exceeds the threshold value.

The reason why the viscous damping coefficient can be adjusted is that it is better that the viscous damping coefficient is low under operating conditions without vibration. In such a state, if the viscosity damping coefficient is increased, the free swing of the crushing roller 3 may be hindered, and the bite of the raw material into the crushing roller 3 may be worsened, which causes vibration. Because it becomes.

Therefore, under normal conditions, the viscosity damping coefficient is kept low, and when the measured value of vibration increases and exceeds the threshold value, it is determined that unsteady self-excited vibration has been detected, and the viscosity coefficient is immediately determined by the control device. Send an increase instruction to the damper. By this control, it is possible to increase the damping ratio ζ and significantly reduce the vibration amplitude during self-excited vibration.

After the measured vibration value returns to a steady state, the damping coefficient control device G issues an instruction to restore the viscous damping coefficient. Since the set value (threshold value of vibration value, change of viscosity damping coefficient with respect to measured value) differs depending on the crushing application and the size of the vertical crusher, it is adjusted by finding the optimum setting at the operation adjustment stage.

Here, for reference, FIG. 3 conceptually shows a vibration model of the vertical crusher.
The vibration system is simulated as shown in FIG. 3A by using the vibration reduction of the vibration generated in the vertical crusher as a crushing roller. The spring constant K in FIG. 3A can be regarded as a crushing layer directly under the crushing roller.

In the present invention, a dashpot C (viscosity coefficient) as shown in FIG. 3B is installed in this crushing system, and the vibration amplitude when self-excited vibration is generated is reduced by setting the ζ to the optimum value. be.

τ：減衰比率
Ｃ：粘性係数（Ｎ・ｓ／ｍ）
Ｍ：質量（Ｋｇ）（竪型粉砕機の場合はローラ系の質量）
Ｋ：バネ定数（Ｎ／ｍ）

τ: Attenuation ratio C: Viscosity coefficient (N · s / m)
M: Mass (Kg) (in the case of a vertical crusher, the mass of the roller system)
K: Spring constant (N / m)

According to the present embodiment, a damper 51 having an adjustable viscous damping coefficient is installed inside the spring 55, and is connected to the lower arm 6B of the swing lever 6 with a pin. This plays a role corresponding to the dashpot C in FIG. 3 (B). The dashpot C may be configured such that the tip of the damper 51 on the swing lever side and the lower arm 6B are in contact with each other and separated from each other, and the damper 51 expands and contracts to suppress the rotation of the swing lever 6. It suffices if the configuration is arranged so as to play the damper function.

Further, in the present embodiment, as the mechanical stopper, the swing lever stopper 60 is provided as described above, and the spring 55 and the damper 51 are arranged separately.

When changing the viscosity damping coefficient, it is also effective to set a time delay by a timer or the like depending on the case. Further, for example, it is also effective to make a control circuit that predicts the occurrence of self-excited vibration in advance from the monitoring result of the roller layer thickness and gives an instruction to change the viscosity damping coefficient.

According to the present embodiment, even when self-excited vibration occurs, the vibration value can be significantly reduced, damage to the equipment can be prevented, and operation stoppage (vibration trip) can be avoided. , Stable operation becomes possible.

As described above, the vertical crusher according to the present invention can significantly reduce the vibration value even in the case where the self-excited vibration increases during operation, and is particularly suitable for finely pulverizing the raw material. Can be used as a crusher.

1 Vertical crusher 2 Rotating table 3 Crushing roller 6 Swing lever 6A Upper arm part 6B Lower arm part 8A Piston rod 14 Classifier 35 Raw material input port 39 Upper outlet 50 Damper system 51 Damper (viscous damping coefficient adjustment type)
53 Damper Case 53A 1st Damper Mounting Part 55 Spring 60 Swing Lever Stopper 61 Stopper Spindle 61A Stopper Handle 63 Stopper Mounting Case 70 Pedestal

Claims (3)

In the operation method of the vertical crusher that crushes the raw material put on the rotary table by the crushing roller supported by the swing lever.
A vibration sensor for measuring vibration is placed in the casing of the vertical crusher.
A hydraulic cylinder is connected to the lower arm part of the swing lever that rotates while being pivotally supported by the casing of the vertical crusher, and a crushing roller is attached to the upper arm part.
A damping coefficient adjustment type damper that is attached to the casing of the vertical crusher and expands and contracts with respect to the rotation direction of the swing lever to suppress the rotation of the swing lever is arranged, and is based on the measured value of the vibration sensor. Equipped with a control device that changes the damping coefficient of the damper
The control device controls the viscous damping coefficient of the damper that suppresses the rotation of the swing lever to be low under normal conditions, and when the measured value of vibration increases and the measured value of the vibration sensor exceeds a preset value, A method of operating a vertical crusher characterized by suppressing self-excited vibration by instructing an instruction to increase the viscous damping coefficient and increasing the damping ratio by changing the damping coefficient. In a vertical crusher that crushes the raw material put on the rotary table with a crushing roller supported by a swing lever.
A vibration sensor that measures vibration is placed in the casing of the vertical crusher.
A hydraulic cylinder is connected to the lower arm part of the swing lever that rotates while being pivotally supported by the casing of the vertical crusher, and a crushing roller is attached to the upper arm part.
A damping coefficient adjustment type damper that is attached to the casing of the vertical crusher and expands and contracts with respect to the rotation direction of the swing lever to suppress the rotation of the swing lever is arranged , and is based on the measured value of the vibration sensor. Equipped with a control device that changes the damping coefficient of the damper
The control device controls the viscous damping coefficient of the damper that suppresses the rotation of the swing lever to be low under normal conditions, and when the measured value of vibration increases and the measured value of the vibration sensor exceeds a preset value, It is a control device that suppresses self-excited vibration by instructing an instruction to increase the viscous damping coefficient and changing the damping coefficient to increase the damping ratio.
The damper is arranged in a cylindrical damper case screwed and attached to a support member, and is screwed and attached to a side surface portion formed on the anti-swing lever side of the damper case, and the damper swing. A vertical crusher characterized in that the tip on the lever side abuts on the swing lever or is attached to the swing lever . The vertical crusher according to claim 2, wherein a spring is arranged inside the damper case and expands and contracts with respect to the rotation direction of the swing lever.

Images