JPH10128141A - Crushing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that the abnormal lowering of the pressure of the pressure medium in a hydraulic cylinder is generated even if a sudden large change is generated in the thickness of an article to be crushed. SOLUTION: Two kinds of systems, that is, a high speed hydraulic pressure medium supply system constituted of pipings 31 (31a, 31b), a pressure control valve 33 and an accumulator 34 and an attenuation applying system constituted of pipings 32 (32a, 32b), a flow rate control valve 23 and an accumulator 35 are connected to the upper room (on the side pressing a roller 2 to a crushing ring 1 by sending in a pressurized hydraulic medium 26) of the piston 21 in the hydraulic cylinder 20 and both systems can send the pressurized oil pressure medium 26 supplied from a hydraulic pressure source 36 into the hydraulic cylinder 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a crushing device,
In particular, it prevents intense self-excited vibration that occurs during grinding, and
The present invention relates to a pressurizing mechanism of a crusher capable of avoiding an abnormal decrease in pressure in a hydraulic cylinder even with a large change in the layer thickness of a crushed object.

[0002]

2. Description of the Related Art FIG. 8 shows an overall schematic configuration of a conventional roller-type pulverizer. The yoke 10 is rotatably mounted on the output shaft of the speed reducer 11, and the annular crushing ring 1 is fixed on the yoke 10. Rollers 2 rotatably mounted on a roller bracket 3 by means of a shaft 5 and bearings are arranged at equal intervals in recesses on the crushing ring 1.
Pairs are installed.

The upper portion of the roller bracket 3 and the lower surface of the pressure frame 9 are formed with grooves into which the pivot pins 4 are inserted. The roller bracket 3 and the rollers 2 are crushed by the pressure frame 9 via the pivot pins 4. The roller 2 is pressurized on the ring 1 and the roller 2 can perform a pendulum movement about the pivot pin 4.

[0004] A pivot arm 12 is attached to the pressure frame 9, and the other end of the pivot arm 12 is connected to a loading rod 13 fixed to a hydraulic cylinder 17.

When the input shaft of the reduction gear 11 is rotated by the motor, the yoke 1 attached to the output shaft of the reduction gear 11 is rotated.
0, and the crushing ring 1 fixed to the yoke 10 rotates. At this time, the hydraulic cylinder 17 is pulling the loading rod 13 downward, and this tensile force presses the pressurizing frame 9 downward via the pivot arm 12.

By this mechanism, the roller 2 is strongly pressed onto the crushing ring 1 via the pressure frame 9, the pivot pin 4, and the roller bracket 3, and the crushed object 18 (see FIG. 9) on the crushing ring 1 is crushed. Is performed efficiently.

On the other hand, the material to be pulverized (for example, coal) is dropped from a supply pipe 14 at the upper center, and is pulverized by being crushed by being sandwiched between the roller 2 and the pulverization ring 1. Crushed material (for example,
The pulverized coal) is blown up by hot air and passes through a classifier 15. Those having a predetermined particle size fall into an outlet pipe 16, and those having a larger particle size fall into a pulverizing section, and are pulverized again. Reference numeral 19 indicates a housing.

FIG. 9 is a side view of a pressing mechanism of the roller type pulverizer. A roller 2 is rotatably disposed in the recess on the crushing ring 1. Grooves into which the pivot pins 4 enter are formed in the upper part of the roller bracket 3 and the lower surface of the pressure frame 9, and the roller bracket 3 and the roller 2 are placed on the crushing ring 1 by the pressure frame 9 via the pivot pins 4. , So that the roller 2 does not fall down.

A pivot arm 12 is attached to the pressure frame 9, and the other end of the pivot arm 12 is connected to a loading rod 13. The other end of the loading rod 13 is connected to a piston 21 in the hydraulic cylinder 20.

A line 27 is connected to the hydraulic cylinder 20. A hydraulic medium 26 is supplied by a pump through the line 27 to pull the loading rod 13 and press the roller 2 onto the crushing ring 1. Further, the accumulator 22 is attached to the conduit 27 so that the pressure fluctuation of the hydraulic medium 26 can be absorbed to some extent.

In the above-mentioned conventional apparatus, when the load to be pulverized into the pulverizer becomes small when the load is low or when the pulverizer is stopped,
There has been a problem that the amount of the material to be crushed on the crushing table is reduced and the particle size becomes finer, slippage occurs between the roller and the material to be crushed, and accompanying this, severe self-excited vibration occurs.

When slippage occurs between the roller and the material to be crushed,
Vertical vibrations are induced in the rollers, and the vibrations grow self-excitingly, resulting in extremely severe vibrations, which hinders the operation of the crusher from being continued.

In order to solve such a problem, a proposal shown in FIG. 10 (Japanese Patent Application No. 7-201202) by the inventors has been made. In the pulverizing device shown in the figure, a flow control valve 23 is provided in a hydraulic pipeline 27 as a means for giving a flow resistance to the hydraulic medium 26, and the opening degree of the flow control valve 23 is changed to change the flow resistance value for the hydraulic medium 26. By setting the optimum value, an oil damper is configured to absorb and reduce the vibration of the pulverizing section.

During operation of the pulverizing apparatus, the roller 2 and the object 1 to be pulverized
8, the roller 2 vibrates violently in the vertical direction, the roller bracket 3, the pressure frame 9, the pivot arm 12, the loading rod 13, and the piston 2
1 also moves up and down, and the hydraulic medium 2 in the hydraulic cylinder 20
6 flows out / in from the hydraulic cylinder 20. Accordingly, the hydraulic medium 26 in the pipe 27 also moves, and the hydraulic medium 26 passes through the flow control valve 23 and flows out of the accumulator 22.
Will flow in.

According to this device, the flow control valve 23 functions as an oil damper by adjusting the degree of opening of the flow control valve 23 to give an appropriate resistance to the flow of the hydraulic medium 26.
The vibration energy of the hydraulic medium 26 can be absorbed, and the vibration growth of the roller 2 can be prevented.

In this apparatus, a sensor 25 for monitoring the vibration of the crushing section is attached to the roller bracket 23, and the control device 24 adjusts the flow resistance value of the flow control valve 23 so that the vibration absorbing effect is always maximized. You can do it.

As a proposal similar to the invention shown in FIG.
There is a proposal described in Japanese Utility Model Publication No. 60-35753 shown in FIG. In the figure, 111 is an arm, 114 is a hydraulic cylinder, 115 is a rod, 117 is a pipe, 118 is a flow control valve, 119 is a check valve, 120 is a damper device, 121 is an accumulator, 122 is a valve, and 123 is a check. Valve, 124
Is a safety valve.

[0018]

The conventional crushing apparatus can prevent the self-excited vibration generated when the particle size of the material to be crushed becomes small. When the roller and the piston in the cylinder drop rapidly, the pressure medium from the pump to the hydraulic cylinder cannot keep up and the pressure in the hydraulic cylinder rises sharply. There is a problem that it may be reduced.

FIG. 12 schematically shows the vertical displacement of the roller during the operation of the crusher. In the same figure, AB are ranges in which the layer thickness of the material to be ground on the grinding ring is increased due to an increase in the supply amount of the material to be ground after startup, and the rollers are moved upward.
C is a range where the supply amount of the material to be ground is constant and the layer thickness of the material to be ground on the grinding ring is constant. The range in which the layer thickness of the pulverized material is also reduced, and D to E are ranges in which self-excited vibration occurs.

The point E is a point at which the supply amount of the material to be ground is increased again.
Point F is a point where an emergency has occurred in the crusher due to some abnormality and the crusher has been stopped urgently with the crushed material left in the crusher. Point G is a point where the crusher has been restarted with the crushed material left in the crusher. This is the point where the object to be crushed in the crushing device is discharged after being discharged out of the crushing device and stopped.

After being restarted at the point G, the amount of the material to be ground in the grinding device rapidly decreases, so that the layer thickness of the material to be ground on the grinding ring also decreases rapidly. Also descends. At this time, the roller descending speed is 1 at the maximum.
It may reach 30 mm / s.

In the apparatus shown in FIG. 10, consideration is given so that the shortage of the hydraulic medium 22 caused by the lowering of the piston 21 can be supplied from the pump. However, the supply amount of the hydraulic medium 22 from the pump is small, and it is possible to cope with a slow change in the layer thickness of the object to be crushed in FIGS. The supply of the hydraulic medium 22 from the pump cannot keep up with the change in the layer thickness, and the pressure in the hydraulic cylinder 20 drops abnormally. In the worst case, a phenomenon occurs in which the inside of the hydraulic cylinder 20 becomes vacuum. hand,
The operation of the pulverizer may not be continued.

The device shown in FIG. 11 is provided with a check valve 119 in parallel with the flow control valve 118 in order to prevent such a phenomenon. When the pressure in the hydraulic cylinder 114 increases and the hydraulic medium flows out of the hydraulic cylinder 114, the hydraulic medium passes through the flow control valve 118 and passes through the hydraulic cylinder 114.
When the pressure inside the cylinder decreases and the hydraulic medium flows into the hydraulic cylinder 114, the hydraulic medium passes through the check valve 119 of the hydraulic medium.

However, in this apparatus, the flow of the hydraulic medium into the hydraulic cylinder 114 does not catch up, and the pressure does not decrease further. However, the flow by the flow control valve 118 is only performed when the hydraulic medium flows out of the hydraulic cylinder 114. Since the resistance does not work, the anti-vibration effect is reduced by half.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, maintain an anti-vibration effect, and maintain the pressure in the hydraulic cylinder even when a sharp change in the thickness of the material to be ground occurs. An object of the present invention is to provide a pulverizing device that does not cause an abnormal decrease in pressure of a medium.

[0026]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a variable flow control valve, an accumulator, and a supply means for supplying a hydraulic medium to a hydraulic cylinder for pressing a grinding roller onto a grinding ring. Two types of systems are provided: a damping system composed of piping, and a high-speed hydraulic medium supply system composed of a pressure control valve or an on-off valve, an accumulator, and piping connecting these components. This is achieved by controlling the opening and closing of the pressure control valve or the on-off valve of the high-speed hydraulic medium supply system using at least one of the displacement or speed of the crushing unit, the vibration of the crushing unit or the roller, and the supply amount of the crushed material.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-mentioned means, normally, a pressure control valve or an on-off valve of a high-speed hydraulic medium supply system is closed, and when vibration occurs in a roller and a pulverizing section, a hydraulic cylinder which presses the roller is used. The piston inside also vibrates, and accordingly, the hydraulic medium only in the damping system vibrates. The damping system is provided with a flow control valve that gives resistance to the flow of the hydraulic medium, and this resistance absorbs vibration energy and can prevent vigorous self-excited vibration of the roller and the crushing unit.

Further, at least one of a pressure change in a cylinder, a displacement or a speed of a piston in a cylinder, a vibration of a crushing unit or a roller, and a supply amount of a material to be crushed is used.
Detects the sign of an abnormal drop in the pressure of the hydraulic medium in the cylinder, and opens the pressure control valve or open / close valve of the high-speed hydraulic medium supply system, so that the hydraulic medium in the accumulator of the high-speed hydraulic medium supply system flows into the cylinder. Therefore, it is possible to prevent the abnormal pressure drop in the cylinder from occurring.

FIG. 1 shows the configuration of the first embodiment of the pressing mechanism of the roller type pulverizer according to the present invention. Crush ring 1
The roller 2 rotatably supported by the roller bracket 3 by the shaft 5 and a bearing is installed in the upper concave portion. Upper part of roller bracket 3 and pressure frame 9
A groove for receiving the pivot pin 4 is formed on the lower surface of the roller, and the roller bracket 3 and the roller 2 are pressed onto the crushing ring 1 by the pressing frame 9 via the pivot pin 4,
The roller 2 can move in a pendulum about the pivot pin 4.

A pivot arm 12 is attached to the pressure frame 9, and the other end of the pivot arm 12 is connected to a loading rod 13. The other end of the loading rod 13 is connected to a piston 21 housed in a hydraulic cylinder 20.

In a chamber above the piston 21 in the hydraulic cylinder 20 (the side where the roller 2 can be pressed onto the crushing ring 1 by feeding the pressurized hydraulic medium 26), a pipe 31 (31a, 31b), Two types of systems are connected: a high-speed hydraulic medium supply system composed of a pressure control valve 33 and an accumulator 34, and a damping system composed of a pipe 32 (32a, 32b), a flow control valve 23, and an accumulator 35. The two systems can feed the pressurized hydraulic medium 26 supplied from the hydraulic source 36 into the hydraulic cylinder 20.

The inner diameter of the pipe 31 of the high-speed hydraulic medium supply system and the capacity of the accumulator 34 can supply the hydraulic medium 26 to the cylinder 20 at a sufficient speed based on the sectional area of the hydraulic cylinder 20 and the amount of displacement of the piston 21 generated. It has been decided as follows.

Pressure control valve 33 of high-speed hydraulic medium supply system
Is a mechanism that opens and closes according to the pressure in the pipe 31a on the hydraulic cylinder 20 side, and closes when the pressure in the pipe 31a, that is, the pressure in the hydraulic cylinder 20, is equal to or higher than a predetermined limit pressure, and is equal to or lower than the predetermined limit pressure. When it becomes, it is designed to open.

Therefore, when the pressure in the hydraulic cylinder 20 drops below a predetermined limit pressure, the hydraulic medium 26 stored in the accumulator 34 can be quickly supplied to the hydraulic cylinder 20.

On the other hand, the flow control valve 23 of the damping system
The resistance value of the hydraulic medium 26 generated by the vibration of the piston 21 can be changed over a wide range. The hydraulic medium 26 that has passed through the flow control valve 23 can be stored in the accumulator 35.

The present invention is characterized in that two systems, a damping system and a high-speed hydraulic medium supply system, are provided in the pressurizing mechanism of the pulverizing device. Even if the thickness of the pulverized material suddenly decreases, it is possible to prevent the abnormal pressure drop of the pressure medium in the hydraulic cylinder from occurring. Hereinafter, the reason will be described.

First, the avoidance of abnormal pressure drop will be described. In FIG. 1, when the layer thickness of the object 18 to be crushed decreases at an abnormally high speed as in the range between G and H in FIG. , Pressurizing frame 9, pivot arm 12, piston 21 connected via loading rod 13
Also descends. When the piston 21 descends, the pressure of the hydraulic medium 26 in the hydraulic cylinder 20 starts to drop sharply.

In the pressurizing mechanism according to the present invention, the pressure control valve 33 opens when the pressure of the hydraulic medium 26 in the hydraulic cylinder 20 falls below a predetermined pressure. The hydraulic medium 26 stored in the accumulator 34 is supplied to the hydraulic cylinder 20 through the pipe 31.

When the piston 21 descends, the insufficient amount of the hydraulic medium 26 in the hydraulic cylinder 20 is supplemented. When the pressure rises again to a predetermined pressure, the pressure control valve 33 is closed and the hydraulic medium 26 Because supply stops,
The pressure in the hydraulic cylinder 20 is maintained at a predetermined pressure.

On the other hand, in the conventional pulverizer shown in FIG. 10, the hydraulic medium 26 is supplied only from the pump.
The supply of the hydraulic medium 26 to the hydraulic cylinder 20 cannot keep up, and the pressure in the hydraulic cylinder 20 drops rapidly.

Next, prevention of self-excited vibration will be described. When the roller 2 slides on the object 18 and the roller 2 vibrates violently in the vertical direction, the roller bracket 3, the pressure frame 9, the pivot arm 12, the loading rod 1
3, and the piston 21 also moves up and down similarly.

The displacement of the self-excited vibration is very small (displacement amplitude: 1 mm
Degree, frequency: about 20 Hz).
Because there is no abnormal rise or fall in the pressure fluctuation inside the
The pressure control valve 33 is closed.

Therefore, when the piston 21 in the hydraulic cylinder 20 moves up and down and the hydraulic medium 26 in the hydraulic cylinder 20 flows out / in from the hydraulic cylinder 20, the damping constituted by the pipe 32, the flow control valve 23 and the accumulator 35 is performed. A flow occurs in the hydraulic medium 26 only in the application system. At this time, the flow control valve 23 functions as a flow resistance for the hydraulic medium 26, and by appropriately setting the opening degree of the flow control valve 23, that is, the flow resistance value, the damping system operates as an oil damper, and the pulverization is performed. It is possible to reduce and absorb the vibration by replacing the vibration energy of the part with the heat energy.

Next, a description will be given of how vibration can be absorbed by giving a flow resistance to the hydraulic medium 26. FIG.
FIG. 7 is a characteristic diagram showing a vibration absorption reducing effect when the flow resistance value of the hydraulic medium 26 is changed by changing the opening of the flow control valve 23.

The horizontal axis shows the flow resistance value R (Ns / mm ⁵ ), and the vertical axis shows the magnitude of the vibration displacement when the roller 2 is vibrated in the vertical direction. The flow rate Q (mm ³ / s) of the hydraulic medium 26 passing through the flow control valve 23, the pressure Pa (N / mm ² ) of the hydraulic cylinder 20 and the pipe 32a, the pressure Pb (N / mm ² ) of the pipe 32b, and the flow resistance The value R (Ns / mm ⁵ ) has the following relationship.

Q = (Pa−Pb) / R As shown in FIG.
Is also changed, and there is a flow resistance value at which the vibration displacement amount becomes the smallest, that is, a flow resistance value at which the vibration absorbing effect becomes the largest.

Hereinafter, the movements of the roller 2 and the piston 21 in three typical flow resistance values will be described. Region R _A to R _B in the figure is a region flow resistance value is too small, the hydraulic medium 26 passes without resistance the flow control valve 23. In this case, the piston 21 can freely move up and down with the vibration of the roller 2, and the vibration of the roller 2 cannot be absorbed and reduced.

Meanwhile, the region R _D to R _E is an area flow resistance value is too large, the hydraulic medium 26 will be hardly pass through the flow control valve 23. Hydraulic medium 26 is flow control valve 2
3, the shaft 5, the pivot pin 4, the loading rod 13, and the hydraulic medium 26 in the hydraulic cylinder 20 vibrate as elastic bodies due to the vibration generated in the roller 2, so that the vibration of the roller 2 also grows, Cannot be reduced.

The region R _B to R _D is a flow resistance value which can absorb reduce vibration. In this case, the roller 2 and the piston 21
Can be absorbed by the flow resistance of the flow control valve 23, so that the vertical movement of the roller 2 can be reduced.

R _C is the flow resistance value at which the vibration can be absorbed and reduced most. If the flow resistance value of the flow control valve 23 is set at R _C , the vibration of the roller 2 and the crushing portion can be reduced most. The occurrence of self-excited vibration can be prevented.

As described above, the pressurizing mechanism of the crushing device according to the present invention maintains the vibration preventing effect,
The hydraulic cylinder 2
Abnormal pressure drop of the pressure medium within 0 does not occur.

FIG. 3 is a configuration diagram of a pressing mechanism according to a second embodiment of the present invention. In this embodiment, a pressure sensor 25 is attached to a hydraulic pipe 31, a sign of an abnormal decrease in pressure in the hydraulic cylinder 20 is detected by the pressure sensor 25, and the on-off valve 37 is opened and closed by the control device 24. is there.

The operation and effects of this embodiment are the same as those of the first embodiment. However, in this embodiment, since the control device 24 opens and closes the on-off valve 37, the on-off valve 37 is opened and closed. The feature is that the magnitude and timing of the pressure can be set with high accuracy.

FIG. 4 is a configuration diagram of a pressing mechanism according to a third embodiment of the present invention. This embodiment employs a roller bracket 3 to detect the occurrence of self-excited vibration of the crushing unit.
The on-off valve 30 is opened and closed according to the presence or absence of self-excited vibration. More specifically,
Normally, the on-off valve 37 is opened, and when a sign of self-excited vibration is detected by the vibrometer 38, the on-off valve 37 is closed and a damping hydraulic medium supply system constituted by the accumulator 35 and the flow control valve 23 is used. This is to prevent self-excited vibration.

FIG. 5 is a configuration diagram of a pressing mechanism according to a fourth embodiment of the present invention. In this embodiment, the thickness of the object to be ground 18 or the amount of change in the thickness is estimated from the displacement measured by the displacement meter 39 attached to the loading rod 13 or the speed that is the time derivative of the displacement, The on-off valve 37 is opened and closed by detecting a sign of occurrence of self-excited vibration of the crushing unit.

It has been clarified from the study of the inventors that self-excited vibration occurs when the thickness of the crushed object 18 becomes thinner. By closing, self-excited vibration can be prevented.

FIG. 6 is a configuration diagram of a pressing mechanism according to a fifth embodiment of the present invention. In this embodiment, the on-off valve 37 is opened and closed based on the classification degree of the classifier, the supply amount of the crushed object 18, and the properties of the crushed object 18. The self-excited vibration of the pulverizing section is generated as the classifying degree of the classifier is larger, that is, when the pulverized material 18 is to be pulverized into fine powder or when the supply amount of the pulverized material 18 is small. Further, the easiness of the self-excited vibration is greatly affected by the properties of the material 18 to be ground.

In this embodiment, normally, the on-off valve 37 is opened, and the occurrence of self-excited vibration is predicted based on the classification degree of the classifier, the supply amount of the crushed material 18 and the properties of the crushed material 18. By closing the on-off valve 37, self-excited vibration is prevented.

FIG. 7 is a configuration diagram of a pressing mechanism according to a sixth embodiment of the present invention. In this embodiment, a flow control valve 23 is interposed between the accumulator 35 and the pipe 32b as shown in FIG.

[0060]

The crushing apparatus according to the present invention prevents the occurrence of self-excited vibration and prevents the pressure in the hydraulic cylinder from being abnormally reduced even when the layer thickness of the crushed material changes rapidly. It is possible to avoid.

Therefore, the operation range is not limited by the generation of vibration, and stable grinding can be performed. In addition, it is also possible to ultra-pulverize the material to be pulverized which could not be realized by the conventional vibration generation. There is a great effect such as improvement of

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a pressing mechanism of a roller-type crusher according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between a vibration displacement of a crushing unit and a flow resistance value of a hydraulic medium.

FIG. 3 is a configuration diagram of a pressing mechanism of a roller-type crusher according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a pressure mechanism of a roller-type crusher according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a pressing mechanism of a roller-type crusher according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a pressing mechanism of a roller-type crusher according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a pressure mechanism of a roller-type crusher according to a fifth embodiment of the present invention.

FIG. 8 is an overall configuration diagram of a conventional roller-type crusher.

FIG. 9 is a configuration diagram of a pressure mechanism of a conventional roller-type pulverizer.

FIG. 10 is a configuration diagram of a pressure mechanism of a roller-type crusher according to the above proposal.

FIG. 11 is a configuration diagram showing a pressure mechanism of another conventional pulverizing device.

FIG. 12 is a schematic diagram illustrating a change in vertical displacement of a roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crush ring 2 Roller 3 Roller bracket 4 Pivot pin 5 Axis 9 Pressure frame 12 Pivot arm 13 Loading rod 18 Crushed object 19 Housing 20 Hydraulic cylinder 21 Piston 23 Flow control valve 24 Control device 25 Pressure sensor 26 Hydraulic medium 31, 32 Piping 33 Pressure control valve 34, 35 Accumulator 36 Hydraulic source 37 On-off valve 38 Vibration meter 39 Displacement meter

Continuing on the front page (72) Nobuyasu Miwa, No. 3-36, Takara-cho, Kure-shi, Hiroshima Babkotsuk Hitachi, Ltd. Inside Kure Research Laboratories (72) Inventor Teruaki Tatsuma 6-9, Takaracho, Kure-shi, Hiroshima Babukotsukushi Hitachi, Ltd. Kure Factory (72) Inventor Hideo Mitsui 6-9 Takara-cho, Kure City, Hiroshima Prefecture Inside the Babkotsuk Hitachi Kure Factory (72) Inventor Tadashi Hasegawa 6-9 Takaracho, Kure City, Hiroshima Prefecture Babukotsukita Hitachi Kure Factory

Claims (4)

[Claims] 1. On a crushing ring rotatably supported,
Pulverizing rollers are arranged at predetermined intervals along the direction of rotation of the pulverizing ring, and the pulverizing roller is pressed onto the pulverizing ring using a hydraulic pressure mechanism, and the pulverized material is pulverized by the pulverizing roller and the pulverizing ring. A pulverizing device, wherein two systems, a damping system and a high-speed hydraulic medium supply system, are connected to a hydraulic cylinder of a pressurizing hydraulic mechanism. 2. The damping system according to claim 1, wherein the damping system includes a variable flow control valve, an accumulator, and a hydraulic pipe connecting the variable flow control valve and the accumulator, and the high-speed hydraulic medium supply system includes a pressure control valve or an on-off valve and an accumulator. And a pulverizing device comprising a pipe for connecting them. 3. The high-pressure hydraulic medium supply system according to claim 2, wherein the pressure control valve or the on-off valve of the high-speed hydraulic medium supply system uses at least one of a pressure in a hydraulic cylinder, a displacement or a speed of a piston, and a vibration of a crushing unit. A crushing device characterized by being controlled to open and close. 4. The high-speed hydraulic medium supply system according to claim 2, wherein the pressure control valve or the on-off valve of the high-speed hydraulic medium supply system controls at least one of the property of the material to be ground, the supply amount of the material to be ground, and the degree of classification of the classifier. A pulverizing device characterized in that it is configured to be controlled to open and close by using the same.