JPS61146351A - Vertical crusher - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vertical pulverizer that pulverizes cement raw materials, coal, chemicals, etc. by cooperation of a rotary table and rollers.

[Prior art]

2. Description of the Related Art Vertical crushers equipped with a rotary table and rollers are widely used as a type of crusher that finely crushes granules such as cement raw materials, coal, and chemicals into powder.

FIG. 1 is a longitudinal cross-sectional view of a vertical pulverizer of the same type, and the outline of its structure will be explained based on the figure. A vertical speed reducer 4 with a motor is provided at the lower center of the casing 3.

Reference numeral 5 denotes a rotary table which is directly connected to the output shaft of the reducer facing upward and has an annular liner stuck to its upper end plane, and the raw material supplied by the conveyor to the supply tube 6 projecting upward from the casing 3 is transferred to the rotary table. It is configured to be supplied to the center of 5. Reference numeral 7 denotes a plurality of bearings (four in this crusher) located at positions dividing the outside of the rotary table 5 into a plurality of equal parts in the circumferential direction and pivotably supported on the casing 3 side, Each bearing 7 has a conical shaped roller 8 which is rotatably supported with its circumferential surface facing the liner surface of the rotary table 5. A driving device 9 is provided for moving the roller 8 so as to move the roller 8 into contact with the rotary table 5 and to move the roller 8 away from the rotary table 5. In other words, a hydraulic cylinder 10 is pivotally supported on the casing 3 side in correspondence with each bearing 7, and the working end of the piston rod 11 and the pivot shaft 1 of the bearing T are connected to each other.
2 are connected by a connecting rod 13. and,
A hydraulic device (not shown) sends oil to the rod end bow (bow) 10C (hereinafter referred to as C port 10C) of the hydraulic cylinder 10, so that the piston rod 11 retreats, the roller 8 is pressed against the rotary table 5, and the head end side baud)
By supplying oil to port 10D (hereinafter referred to as D port 100), piston rod 11 moves forward and roller 8 separates from rotary table 5.

A discharge port 14 and a suction port 15 are opened at the upper and lower ends of the casing 3 and are connected to each other by a duct (not shown), and a suction fan and a hot air stove are provided in the duct. As the hot air rotates, hot air enters the casing 3 through the suction port 15 and rises, and then is discharged from the discharge port 14 and circulated. A separator 16 is pivotally supported on the casing side, and is configured to classify the powder and granules that are crushed between the rotary table 5 and the rollers 8 and rise with the hot air into particles with a predetermined particle size or more and those with a predetermined particle size or less. It is configured. 17 is a hot air passage, and 18 is an annular hot air blowing passage formed between the rotary table 5 and the wall surface of the casing 3.

With the above configuration, when the motorized reducer 4 and the suction fan are started and the raw material is supplied from the supply cylinder 6 to the center of the rotary table 5, the raw material is rotated by the rotation of the rotary table 5. and centrifugal force, it draws an arc-shaped trajectory toward the outer periphery of the table. When the pressure oil is C port 10C
Since the roller 8 is in pressure contact with the rotary table 5, the raw material directed toward the outer periphery of the table is caught between the roller 8 and the rotary table 5, is crushed, and escapes from the rotary table 5. and moves upward in the blow-up passage 18. Further, the raw material that has not been bitten by the roller 8 and has deviated from the outer periphery of the table also moves upward in the blow-up passage 18. At this time, the hot air sent from the suction port 15 is blown up in the blow-up passage 18, so the powder and granules that have moved here are blown up together with the hot air and rise inside the casing 3, and the separator 1
It comes into contact with the blade No. 6 and is classified. As a result of the classification, fine powder with a predetermined particle size or less passes through the separator 16 and is discharged from the discharge port 14 together with hot air, and then is collected, and particles with a predetermined particle size or more fall onto the rotary table 5 and have the opportunity to be crushed again. is given.

In a crushing operation such as that shown in FIG.
If the roller continues to rotate while being in direct contact with the liner surface of the rotary table 5 (so-called metal touch) without any intervening objects, the roller 8 or the table 5 will It is necessary to avoid the occurrence of metal contact as much as possible because the liner 5 is damaged, the liner is abnormally worn, and the crusher 1 itself vibrates abnormally, which hinders the smooth operation of the crusher 1. .

Therefore, conventionally, the bearing Ti! Alternatively, a mechanical stopper is provided on the swinging part of the connecting rod 13 to prevent the roller 8 from descending excessively. extremely large,
This increases the inertial force, and in order to regulate this, the stopper has to be large in size, resulting in an increase in cost and space.

Alternatively, a sensor such as a proximity switch or a vibration meter that detects a metal touch may be provided in the drive system of the roller 8, and the signal generated by the sensor may be used to operate the hydraulic circuit to the hydraulic cylinder 10. Rotating table 5 with roller 8
Conventionally, it has been done to separate the sensor from the center, but this also has a problem in that the response is slow. That is, both ports (10C and 100) of the hydraulic cylinder 10 are connected to a hydraulic pump and a tank via electromagnetic switching valves, and during crushing work, the electromagnetic switching valves are switched to the C port 10C side, so that the pressure oil is not flowing. It is directly sent to the C port 10C, or it is once stored in an accumulator and then sent to the C port 10C. Further, the D port 10D is opened to the tank via an electromagnetic switching valve. When a metal touch occurs, the solenoid switching valve is activated by a signal from the sensor.
Since the switch is switched to 0D@ and the C port is opened to the tank, pressure oil is sent to the head end side of the hydraulic cylinder and the roller 8 is lifted. However, in conventional devices such as Nakara, it takes time to fill the long pipe with oil and send it to the D port after the metal touch signal is issued, and the roller 8 is instantly activated. Since the metal cannot be lifted, continuous contact with the metal during the process can damage the rollers and liners, accelerate wear, and create vibrations and noise that can improve the work environment. The disadvantage was that it worsened the In addition, in order to instantly lift the roller 8, a hydraulic pump with a large discharge capacity can be used, but this type of crusher has a hydraulic circuit that maintains the hydraulic pressure in an accumulator or the like during the crushing operation. , a hydraulic pump with a particularly large discharge capacity is unnecessary and wasteful.

[Summary of the invention]

The present invention has been made in view of the above points, and includes a pipe line leading from a switching valve that switches the oil feed path of the hydraulic cylinder for upper and lower crushing rollers to the rod end side and the head end side to the accumulator on the rod end side; A switching valve device is installed in the bypass by short-circuiting the pipeline to the head end side port, and the switching valve device is operated by the abnormal approach signal of the crushing roller to the rotary table generated by the sensor. Then, the pressure oil sent from the accumulator to the rod end side is divided into two parts and sent to the rod end side and the head end side, and the pressure difference due to the difference in pressure receiving area between the rod end side and the head end side causes the piston rod to By moving the liner toward the head end and lifting the crushing roller, it is possible to instantly lift the crushing roller after an abnormal approach, improving the durability of the crushing roller and liner and preventing machine vibration. The purpose is to provide a vertical crusher with a calibrated scale.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 2 is a hydraulic circuit diagram showing an embodiment of the vertical crusher according to the present invention. Since the overall structure of the vertical crusher has been explained based on FIG. 1, the explanation thereof will be omitted, and if necessary, the explanation will be made using the same figure. A plurality of (four in this embodiment) hydraulic cylinders 10 in FIG.
A hydraulic system is attached, the hydraulic circuit diagram of which is shown in the figure. That is, a pair of C-Boe HOCs provided in each hydraulic cylinder 10
A pipe 20 is connected to each of the pipes 20 and 20, and these pipes 20 are collected in a pipe 21. In addition, the pipe connected to the D port 10D of each hydraulic cylinder 10 is the pipe 22.
The pipes 22 and the pipes 21 are
A pair of solenoids SQL! .

It is connected to both ports of an electromagnetic switching valve 23 equipped with SQL2. A hydraulic cylinder 10 is installed on the pipe 21.
A check valve 24 that allows pressure oil to move only in the direction is provided, and a variable throttle valve 25 and a check valve 26 that allow pressure oil to move only in the direction of the switching valve 23 are provided on the pipe 22. It is provided. The other two ports of the electromagnetic switching valve 23 are connected to a hydraulic pump 32 directly connected to a motor 31 and a tank 33 through a pipe 28 having an on-off valve 27 and a pipe 30 having a check valve 29, respectively. To operate the solenoid SQL with a signal from K, the pressure oil is C.
Oil is supplied to port 10C, and pressure oil is supplied to port 10DK by operating solenoid 5QL2. Each of the pipes 20 is provided with an accumulator 34 for storing pressure oil, and is configured to temporarily store the pressure oil sent through the pipes 21 and 20 and then supply it to the C port 10G. has been done. 35 is in a pipe 36 branched from the pipe 21, and is connected to the pipe 21 by releasing pressure oil to the tank 33 when the pressure of the pressure wave toward the IOC exceeds the set pressure.
There is also a relief valve that maintains the set pressure of the pressure oil inside.
Reference numeral 1 denotes a relief valve that maintains the pressure of pressure oil flowing from the hydraulic pump 32 to the electromagnetic switching valve 23 below a set pressure. 3 more
8 is a variable throttle that displays the oil supply pressure from the hydraulic pump 32)
and a pressure gauge with an on-off valve, 39 a filter, and 40 a meter.

A pilot check valve 43 is disposed within the pipe 41 that branches from the pipe 22 and leads to the tank. Furthermore, an electromagnetic switching valve 45 equipped with a solenoid 5OLa*5OL4 is provided in a pipe 42 branched from the pipe 21, and the pressure oil is
When the roller 8 is lowered and the crushing operation is being performed, the solenoid SQL is activated, the electromagnetic switching valve 45 is opened, and the pilot pressure is applied to the pilot check valve 4.
3, the inside of the pipe 22, ie, the D port 10D of the cylinder 10, is opened to the tank and becomes atmospheric pressure. Further, when the pressure oil is fed to the D port 10D to lift the roller 8, the solenoid 5OL4 is activated, the electromagnetic switching valve 45 is closed, and the pilot check valve 43 is closed. Note that when the roller 8 is lowered from the raised position at the start of the crushing operation, the solenoid 5OL4 of the electromagnetic switching valve 45 is operated and the pilot check valve 43 is closed.

46 is a pressure gauge with a variable throttle and an on-off valve that displays the oil pressure inside the pipe 21. Furthermore, a pilot check valve 48 and a relief valve 49 for setting and regulating the oil pressure in the pipe 47 are provided in the pipe 47 branched from the pipe 42 and connected to the tank 33. An electromagnetic switching valve 50 including a solenoid SQL is disposed between the valve 48 and the pipe 21. And roller 8
When the solenoid 5OL5 is lifted, the solenoid 5OL5 is activated, and the pilot check valve 4B is opened and a portion of the pressure oil in the piping 21, which has risen above the set pressure of the relief valve 49, is transferred to the tank 3.
3.

A switching valve device is provided in the hydraulic circuit to divide the pressure oil accumulated in the accumulator 34 into two into the C port 10C side and the D port 10D side when the roller 8 abnormally approaches the top surface of the table 5. It is being

That is, the piping 21 on the C port 10C side and the D port 1
The piping 22 on the 0D side is short-circuited by a piping 51, and a pilot check valve 52 and a check valve 53 that allow pressure oil to move only in the direction of the piping 22 are disposed in the piping 51. The pilot check valve 52 is provided with an electromagnetic switching valve 54 equipped with a solenoid SQL a that is activated by an abnormal approach signal from the roller 8. The pilot check valve 52 is always closed as shown in the figure during the crushing operation in which pressure oil is sent to the C port 10C and hydraulic pressure is maintained in the piping 21 and the accumulator 34. When approaching abnormally, solenoid SQL 6
The electromagnetic switching valve 54 is opened by this operation, and pilot pressure is applied to the pilot check valve 52 to open it. Also, at the same time as it comes off, the solenoid 5QL4
operates and the pilot check valve 43 closes. By opening the pilot check valve 52 and closing the pilot check valve 43 as shown in FIG.
0C.

The pressure oil held in the piping 21 and the accumulator 34 is transferred to the piping 21, 51 . ．． 22, D port 10DK is also sent instantaneously at the same pressure to both bows) 10C.

Divided into 10D. In this case, C of the hydraulic cylinder 10
The rod end side, which is the port IOC side, is the D bow) IO
Since the pressure receiving area of the piston rod 11 is smaller than that of the head end side (D side), when the same pressure oil is sent to both sides, the piston rod 11 moves to the rod end side, and the four rollers 8 lifted up all at once. Shortly after the roller 8 is lifted, the metal touch condition is resolved, and the signal causes the solenoids 5OL6 to turn OFF.
Immediately after becoming FF, the solenoid SQL 3 is activated, and the pressure oil on the head end side is released to the tank 33, and the pressure oil is replenished on the rod end side (C port 10C side), and the roller 8 is lowered. , the grinding is configured to resume.

The operation of the hydraulic circuit configured as above will be explained. When the motor of the motorized reducer 4 is started to rotate the rotary table 5 and a predetermined amount of raw material is supplied onto the rotary table 5, the solenoid 5oLt of the electromagnetic switching valve 23 is activated and pressure oil is discharged through the pipe 21. is sent to the accumulator 34, and is sent to the rod end side of the hydraulic cylinder 10 while maintaining the set pressure of the accumulator 34, so that the roller 8 in the raised position
descends and the crushing operation begins. In addition, when the roller 8 descends from the raised position at the start of operation, as in
The solenoid SQL of the electromagnetic switching valve 45 is activated, the pilot check valve 43 is closed, and the oil on the head side of the cylinder 10 (D port 10D side) is sequentially transferred to the piping 22, the throttle valve 25, the electromagnetic switching valve 23, and the piping. 30 and is collected into a tank 33. After the roller 8 completes its descent onto the table 5, the solenoid SQL s of the electromagnetic switching valve 45 is turned on (state 6 shown in FIG. 2), the pilot check valve 43 opens, and the head side of the cylinder 10 ( D port 10D side) is opened to the tank 33. When we meet again,
Solenoid switching valve 50.54 each solenoid 5OL5°S
When QL is OFF (state shown), check valves 48 and 52 are closed. When the roller 8 descends and a predetermined period of time has elapsed since the start of the crushing operation, the solenoid 5QL1 of the electromagnetic switching valve 23 is turned OFF and becomes a neutral state as shown in the figure, and the rod end side of the cylinder 10 (C port 1
The oil on the 0C side is maintained at a predetermined oil pressure between the check valve 24 in the pipe 21 and the rod end side of the cylinder 10, and thereafter, the crushing operation is continued.

During the crushing operation, if the material to be crushed is no longer supplied to the crusher 1 due to a failure of the raw material feeder, for example, the material to be crushed will not be caught between the rollers 8 and the rotary table 5. In particular, when the roller 8 and the rotary table 5 come abnormally close to each other and a so-called metal touch occurs, a sensor such as a proximity switch or a vibration meter detects this and issues a signal, turning on the solenoid 5OLs = 5OL4. At the same time, the solenoid 5OL3 is turned off. Therefore, when the electromagnetic switching valve 54 opens and pilot pressure is applied, the pilot check valve 52 opens, and when the pilot pressure from the electromagnetic switching valve 45 is no longer applied, the pilot check valve 43 closes.

By opening and closing the valves 52 and 43, the pressure oil in the accumulator 34, which had been held on the C port) 10C side, is transferred to the pipe 21.
．． 51, check valves 52, 53, and piping 22 to D port 10D. In other words, a large amount of pressure oil stored in the accumulator 34 is transferred to both ports.
C and 10D are instantly divided into two parts at the same pressure. In the case of
The rod end side which is the C port 10C side is the D port 1
The piston rod 11 is also on the head end side which is the 0D side.
Since the pressure receiving area is small by a certain amount, piston rod 1
1 moves instantaneously to the rod end side, and the four rollers 8 are lifted all at once. This makes it possible to avoid metal touch. Soon, the material to be crushed will be supplied in the normal state, the metal touch will be resolved, and a signal will be issued, and solenoid 5OL6.80L4 will turn off.
F, solenoid 5QL3 is ON (state shown)
Therefore, the pilot check valve 52 is closed, the pilot check valve 43 is opened, and the D port 10D is connected to the tank 33.
At the same time, the solenoid switching valve 23 (SQL) is activated and pressure oil is supplied from the pipe 21 to the C port 10C side. Therefore, the roller 8 is lowered and the crushing operation is restarted. When a metal touch occurs, the pressure oil in the accumulator 34 is divided into two to lift the roller 8.
The process up to lifting is completed instantly, and even after the metal touch is eliminated, the roller 8 is automatically lowered in a short time and the crushing work is resumed.

When interrupting or finishing the crushing operation, solenoid 5OL2
When turned ON, the electromagnetic switching valve 23 is switched and pressure oil is sent from the pump 32 to the D port 10D side via the piping 22. At the same time, the solenoid 5OL3 is turned off and the solenoid 5OL4 is turned on, so the pilot check valve 43 is closed and the D port IOD side is not released to the tank 33 side. Furthermore, when solenoid 5OLI
Since I is turned on, the pilot check valve 48 opens, and a part of the pressure oil in the pipe 21 is released to the tank 33 through the pipe 42. The four rollers 8 are lifted up by the breakage.

The above example shows an example in which four hydraulic cylinders 10 operate simultaneously at the time of metal touch to lift four 4-28 at the same time. An example will be explained. FIG. 3 is a hydraulic circuit diagram of another embodiment, showing the hydraulic circuit and valve between the pipes 21 and 22 heading to the C port 10C and the D port 10D, respectively, and the hydraulic pump 32 and tank 33. Since it has almost the same structure as the embodiment shown in FIG. 1, the same reference numerals are given and the explanation thereof will be omitted. In addition, this example Kj? In this case, the electromagnetic switching valve 45, pilot check valve 43, and piping 41 shown in FIG. 2 are not provided. C port of each cylinder 10 in the figure)
The K-connected pipes 20 are collected in the pipe 21 and
An accumulator 34 is connected to each pipe 20.

Note that the number of accumulators 34 may be two as shown in FIG. 2, or may be more than that. Further, the pipes 61 connected to the D port 10D of each hydraulic cylinder 10 are collected in the pipe 22, and inside each pipe 61,
C) A check valve 62 that allows pressure oil to move only in the 100 direction is provided. And each C port) 1
Piping 2o going to 0C and piping 61 heading to each C ho) 10D
A switching valve device, generally designated by the reference numeral 63, is provided in each bypass that short-circuits the two. That is, piping 2o
An electromagnetic switching valve 65 equipped with a solenoid SQL is provided in the piping 64 branched from the pipe 64), and a pilot check valve 68 is connected to the pilot circuits 66 and 67 connected to both ports switched by the solenoid 5OL7. ,6
9 are connected to each other. Among these, the pilot check valve 68 is provided in the pipe 70 connecting the pipes 20 and 61, and is connected to the solenoid SQL by the metal touch signal explained in the previous embodiment.

When it turns on, K opens with the pilot pressure and the pressure oil in the accumulator 24 is transferred to the D port 10 through the check valve T1.
It is configured so that it is divided into two parts and sent to D. On the other hand, the pilot check valve 69 is connected to the piping 61 and the tank 33, and is opened by pilot pressure when the roller 8 descends in the illustrated state where the solenoid SQL is OFF or during crushing work. Poe) 1
0C is open to tank 33. Further, when the solenoid 80L is turned ON at the time of metal touch, the pilot check valve 69 is closed and the connection with the tank 33 is cut off.

Furthermore, a remotely operated variable throttle valve 72 is interposed between the pilot check valve 68 and the tank 33), and when the roller 8 is lowered from the raised position, the throttle valve is throttled. When the descent is completed and the crushing operation begins, the cylinder is fully opened and the D port 10D of the cylinder 1o is brought to tank pressure.

With the above structure, during crushing work,
That is, when the roller 8 is lowered onto the table 5, the solenoid SQL is OFF (the state shown in the figure).
, and the pilot check valve 68 is closed.
Pressure oil is stored in the accumulator 34, and the pipe 21.20 and the C port 10C of the hydraulic cylinder 10
Pressure oil is held on the side. On the other hand, the pilot check valve 69 is open and Cho) 10D is released to the tank 33. When a metal touch occurs on one of the four rollers 8 during grinding, the Senna detects this and issues a signal, and only the solenoid SQL 7 corresponding to that roller 8 is turned on. The pilot check valve 68 opens and the pilot check valve 69 closes. Therefore, the pressure oil in the accumulator 34, which had been held on the C-hole 10C side, is also sent to the D port 10D via the pipe 70.81 and the check valve 68.71. In other words, the pressure oil in the accumulator 34 is at both bows)
It is divided into 2 parts at the same pressure into 10C and 10D. In this case, as in the previous embodiment, the piston rod 11 moves toward the four-end end due to the pressure receiving area difference in the hydraulic cylinder 10, and only the roller 8 that caused the metal touch is lifted. Meanwhile, the other rollers 8 are descending and the crushing work continues. When the metal touch is soon resolved and a signal is issued, solenoid SQL is turned OFF, pilot check valve 6 is closed, and pilot check valve 69 is opened.
The port 10D is opened to the tank 33, and pressure oil is supplied to the C-10C side. Therefore, the lifted roller 8 descends and joins the other rollers 8 to continue the grinding operation. and the cylinder 10 of each roller 8
If a short circuit is provided for the roller 8, the other rollers 8 that do not cause metal touch will not be lifted, and the grinding work can be continued, so there is no need to interrupt the grinding work, and the grinding efficiency will be extremely reduced. can be prevented. When the crushing operation is interrupted or completed, the solenoid SQL is turned on and the pilot check valve 69 is closed, so that the pressure oil sent to the pipe 22 by switching the electromagnetic switching valve 23 is
It is sent to D port 10D via piping 61. Since the check valve 71 is acting when
It never goes to 0C. When oil is supplied to D port) 10D, four rollers 8 are lifted all at once. Oh,
The operations of the electromagnetic switching valves 45, 50, etc. during each of the above operations are the same as in the embodiment shown in FIG. 1, so a description thereof will be omitted.

Although each of the above embodiments describes a hydraulic circuit for a crusher provided with four rollers, the number of rollers is not limited to this, and the present invention can be applied to a crusher having any number of rollers. It is something that

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, in a vertical crusher, the oil supply path of the hydraulic cylinder for up and down the crushing roller is switched from the switching valve to the rod end side and the head end side to the rod end side. The pipe line going to the accumulator and the pipe line going to the head end side port are short-circuited by a bypass, and a switching valve device is provided in the bypass, and the switching valve device is used to signal the abnormal approach of the crushing roller and the rotary table. The pressure oil sent from the accumulator to the rod end side is divided into two parts and sent to the rod end side and the head end side, and the pressure difference due to the difference in pressure receiving area between the rod end side and the head end side is reduced. The structure is such that the piston rod is moved to the head end side and the crushing roller is lifted.In the event of an abnormal approach, pressurized oil is sent from the accumulator near the hydraulic cylinder to the head end side, so the crushing roller can be lifted instantly. This prevents damage to the tires of the crushing roller, the liner of the rotary table, etc. due to metal touch, and improves their durability.

In addition, since the crushing work is resumed in an extremely short time after the crushing roller is instantly lifted and the metal touch is eliminated, the vibration and noise generated by the crusher are eliminated in a short time, improving the working environment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a vertical crusher, FIGS. 2 and 3 show an embodiment of the vertical crusher according to the present invention, FIG. 2 is a hydraulic circuit diagram thereof, and FIG. FIG. 3 is a hydraulic circuit diagram showing another embodiment of the invention. 1... Vertical crusher, 5... Rotating table, 8...
...Roller, 10...Writing hydraulic cylinder, 10C...
- Rod end side port, 10D... Head end side port, 21.22... Piping, 23... Solenoid switching valve, 34... Accumulator, 51...
Bypass, 52...Pilot check valve, 53...
-◆・Check valve, 54・・Solenoid switching valve, 63・・
...Switching valve device, 65...Solenoid switching valve, 68, 69
..., pilot check valve, 7 l @ @ @
@Check valve.

Claims (1)

[Claims] Equipped with a hydraulic cylinder that brings the crushing roller into contact with the rotating table by sending pressure oil to the rod end side through an accumulator, and separates the crushing roller from the rotating table surface by sending pressure oil to the head end side. In the vertical crusher, both pipes from the switching valve of the oil feed path to the accumulator and the head end side port of the hydraulic cylinder are short-circuited by a bypass, and the crushing roller, The pressure oil that is sent from the accumulator to the rod end side is activated by the abnormal approach signal of the rotary table and is sent to the rod end side and the head end side in two parts, and the pressure is received by the rod end side and the head end side. A vertical crusher characterized by being provided with a switching valve device that moves a piston rod toward the head end side using a pressure difference due to a difference in area, thereby separating a crushing roller from a rotary table.