JP2009142741A - Grinding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding apparatus capable of efficiently grinding a grinding target. <P>SOLUTION: The grinding apparatus is equipped with a crusher 1 for rotating a pair of crushing rollers 2 and 2 arranged up and down in parallel to each other to crush the grinding target W1 between the crushing rollers 2 and 2, a grinder 5 for rotating a pair of grinding rollers 6 and 6 installed in an obliquely downward direction with respect to the crusher 1 to be laterally arranged in parallel to each other to grind the grinding target W2 crushed by the crusher 1 between the grinding rollers 6 and 6, and the hopper 8, which is provided between the crusher 1 and the grinder 5 and receives the grinding target W2 crushed by the crusher 1 to charge the same into the grinder 5, and provided with an injector 10 for charging the grinding target W2 deposited in the discharge port 3a of the crusher 1 in the hopper 8 by jet air. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pulverizing apparatus for pulverizing an object to be pulverized such as a tree.

  Generally, in order to pulverize a material to be pulverized such as a tree with a pulverizer, the size of the material to be pulverized is too large, and the pulverized material cannot be directly fed into the pulverizer. It is necessary to cut it into small pieces.

  That is, normally, in the step of pulverizing a material to be crushed such as a tree, first, the material to be crushed such as a tree is finely crushed with a crusher, and the material to be crushed is put into a pulverizer and pulverized. I try to crush things.

  Therefore, the pulverization of the material to be crushed requires two devices, a crusher for finely crushing the material to be crushed and a crusher for crushing the crushed material to be crushed. The material to be crushed by the crusher is conveyed to the crusher by the conveyance machine (for example, see Patent Document 1).

Or, instead of this, there is a pulverizer equipped with a pulverizer just below the crusher and a conveyance device that conveys the material to be crushed to the crusher instead of providing a conveyance device in the middle. The material to be crushed is pulverized by two devices, a crusher and a pulverizer (see, for example, Patent Document 2).
Further, in the above-described conventional pulverization apparatus, a hopper is provided between the discharge port of the crusher and the input port of the pulverizer, and the pulverized material crushed by the crusher is charged into the hopper. To be introduced at the entrance of
Japanese Patent Laying-Open No. 2005-350208 (FIG. 1) JP 2000-237625 A (FIG. 1)

  Since the conventional pulverizer is provided with a conveyor in addition to the pulverizer and the pulverizer, it is disadvantageous in that the entire apparatus becomes large. In view of this, the applicant, as disclosed in Japanese Patent Application No. 2006-313965, includes a crusher, a crusher disposed obliquely below the crusher, a discharge port of the crusher, and an input port of the crusher. A pulverizing apparatus that includes a hopper to be connected and does not use a conveyor is proposed. According to the pulverizing apparatus according to this proposal, the entire apparatus can be made compact without using the conveyor.

  However, in the proposed pulverizing apparatus, since the discharge port of the crusher faces sideways, the material to be crushed is also introduced into the hopper from the side, and the material to be crushed on the discharge port is naturally Is difficult to fall into the hopper and is pushed out by the material to be crushed by the crusher and put into the hopper.

  Therefore, if a new material to be crushed is not put into the crusher, the crushed material to be crushed may not be dropped into the hopper and may remain accumulated at the discharge port.

  Here, since the pulverizer pulverizes the object to be crushed very finely compared to the crusher, the pulverizer per unit time in the pulverizer compared to the crushing amount of the object to be crushed per unit time of the crusher. The amount of the pulverized product is small, and due to the difference in processing ability, generally, the processing of the pulverized product by the pulverizer tends not to be in time.

  Therefore, when starting the pulverization of the material to be crushed anew while the material to be crushed is left in the discharge port of the crusher, the pulverizer must collect the material to be crushed at the discharge port. In addition to the amount of material to be newly added to the crusher, the material to be crushed must be pulverized in addition to the amount of material to be crushed in the crusher. The fear increases.

  The pulverizer has a pair of rollers that are arranged in parallel and driven to rotate. As described above, the pulverized material put into the hopper accumulates on the pair of rollers of the pulverizer, and each roller By rotating the roller, the material is sequentially guided between the rollers and pulverized. However, if the processing by the pulverizer is not in time, the material to be crushed accumulates on both rollers, and the material to be crushed becomes a bridge in the hopper. Even if the roller is formed and rotated, the object to be pulverized cannot be guided between the rollers, and the object to be pulverized cannot be pulverized, and the pulverization operation cannot be performed efficiently.

  However, in the proposed pulverizing apparatus, in order to remove the material to be crushed at the discharge port, the worker must do it manually, and the pulverizer and the pulverizer are still in operation. It is dangerous, and only the method of removing the accumulated objects to be crushed by stopping the driving of the pulverizing apparatus can be adopted, and also in this respect, the pulverizing operation cannot be performed efficiently.

  Accordingly, the present invention has been developed to improve the above-described problems, and an object of the present invention is to provide a pulverizing apparatus that can efficiently pulverize an object to be pulverized.

  In order to achieve the above-described object, the problem-solving means of the present invention includes a crusher that rotates a pair of crushing rollers arranged in parallel up and down to crush an object to be crushed between crushing rollers, and an obliquely lower part of the crusher. A crusher is installed between a crusher and a crusher that rotates between a pair of crushing rollers that are installed in parallel and crushes the material to be crushed by the crusher between the crushing rollers. A pulverizer equipped with a hopper that receives the material to be crushed by the mill and puts it into the pulverizer, provided with an injector that feeds the material to be crushed that accumulates at the discharge port of the crusher with the gas to be injected into the hopper. It was.

  According to the present invention, when gas is injected from the injector, the object to be crushed accumulated at the discharge port of the crusher can be introduced into the hopper from the outside, and the operation is not interrupted even during the pulverization operation. Therefore, it is possible to eliminate the accumulation at the discharge port of the object to be crushed safely and easily.

  Furthermore, by performing the gas injection without stopping the driving of the pulverizer after the pulverization operation is finished, the pulverized material accumulated at the discharge port can be put into the hopper and pulverized by the pulverizer. Therefore, it is possible to prevent the crushed material crushed by the crusher at the inlet of the pulverizer inferior in processing amount from forming a bridge. Thus, the object to be crushed can be crushed efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side cross-sectional view of a pulverizing apparatus according to an embodiment. FIG. 2 is a schematic plan view of a pulverizing apparatus according to one embodiment.

  As shown in FIGS. 1 and 2, the pulverizing apparatus in this embodiment rotates a pair of crushing rollers 2 and 2 arranged in parallel vertically, and crushes the object to be crushed W1 between the crushing rollers 2 and 2. The crushing machine 1 that rotates, and the crushing machine 5 that rotates the pair of crushing rollers 6 and 6 that are arranged side by side to crush the material W2 that has been crushed by the crushing machine 1 between the crushing rollers 6 and 6. A hopper 8 that receives the material to be crushed W2 crushed by the crusher 1 between the pulverizer 1 and the pulverizer 5 and puts it into the pulverizer 5; And an injector 10 for throwing the article W2 into the hopper 8.

  The crusher 1 and the crusher 5 are both installed on the base B, and the material to be crushed W2 that is crushed by the crusher 1 and discharged from the crusher 1 is directly fed into the crusher 5. The crusher 5 is installed obliquely below the crusher 1 so that it is possible.

  The crusher 1 is placed on a top plate P1 mounted on a leg L1 standing on the base B, and the crusher 5 is mounted on a top plate P2 mounted on a leg L2 standing on the base B. However, the crusher 1 and the crusher 5 are not limited to the above-described configuration, and may be installed using a frame body. It is natural.

  Specifically, the crusher 1 includes a pair of crushing rollers 2 and 2 arranged in parallel along the vertical direction, a motor M1 that rotationally drives the crushing rollers 2 and 2, and a crushing roller 2 and 2 that can rotate freely. A housing 3 to be supported, and a crushed material input base 4 which is connected to an opening provided on the right end side in FIG. In addition, since the to-be-ground material input stand 4 can be folded, when not performing a grinding | pulverization operation | work, a grinding | pulverization apparatus can be made compact by folding this.

  Each of the crushing rollers 2 and 2 includes a shaft 2a and a plurality of crushing teeth 2b that are arranged on the outer periphery of the shaft 2a with a predetermined interval in the axial direction. While being arranged in parallel, the crushing teeth 2b of one crushing roller 2 enter a nest type between the crushing teeth 2b, 2b of the other crushing roller 2, and on the outer periphery of the shaft 2a of the other crushing roller 2 I'm going to face it.

  Further, the crushing roller 2 disposed in the upper part in FIG. 1 is rotated clockwise by the motor M1, and the crushing roller 2 disposed in the lower part in FIG. When it is inserted between the two crushing teeth 2b, the crushing teeth 2b of one of the crushing rollers 2 and the outer circumference of the shaft 2a of the other crushing roller 2 are cut. After being crushed, the object to be crushed W1 becomes a chip to be crushed object W2 after passing between the crushing rollers 2 and 2.

  When the object to be pulverized W1 is introduced from the right end side in FIG. 1 where the object to be crushed input base 4 is installed in the crusher 1, the object to be pulverized W1 is guided between the crushing rollers 2 and 2 that are driven to rotate. The object to be crushed W2 that has been crushed into chips after being crushed is discharged from a rectangular cylindrical discharge port 3a provided on the left end side in FIG. 1 of the housing 3 on the rear side of the crusher 1. Yes.

  In this way, the large object to be pulverized W1 is crushed by the crusher 1 to the chip-shaped object to be crushed W2 that can be pulverized by the pulverizer 5, and further, the crushing rollers 2, In the case of the present embodiment, 2 is arranged up and down, so that the object to be crushed W1 can be put into the crusher 1 from the lateral direction, and therefore the object to be crushed W1 is a long tree. However, the input operation becomes easy.

  Subsequently, the crusher 5 includes a pair of crushing rollers 6 and 6 arranged in parallel along the side, a motor M2 that rotationally drives the crushing rollers 6 and 6, and the crushing rollers 6 and 6 that are rotatably supported. The lower end opening end of the hopper 8 is connected to the charging port 7a provided at the upper end in FIG. 1 of the housing 7, and the pulverized object W2 dropped on the hopper 8 is pulverized. 5 can be led to the inlet 7a.

  And the hopper 8 forms the closed space A which covers the back of the crusher 1 and the upper part in FIG. 1 of the crusher 5 and connects the discharge port 3a of the crusher 1 and the input port 7a of the crusher 5. The to-be-ground material W2 is prevented from splashing outward while reaching the crusher 5 from the crusher 1.

  This hopper 8 is bridged between the lower end in FIG. 1 of the discharge port 3a in the housing 3 of the crusher 1 and the crusher side end which is the right end in FIG. 1 of the input port 7a in the housing 7 of the crusher 5. An inclined surface 8a from which the object W2 slides down, an opposing surface 8b that faces the rising inclined surface 8a from the anti-crusher side end that is the left end in FIG. Each side surface 8c, 8d spanning the upper and lower ends in FIG. 2 which connects the surface 8a and the opposing surface 8b and which is the left and right ends of the discharge port 3a of the crusher 1 and the input port 7a of the crusher 5, respectively, A top surface 8e connecting the upper end of the outlet 3a in FIG. 1 and the side surfaces 8c and 8d, and an opening formed by the top surface 8e, the opposing surface 8b, and the side surfaces 8c and 8d are hinged to the side surface 8c. And a door 9 that opens and closes. The includes a viewing window 9a which transparent member such as an acrylic plate or a glass plate is fitted.

  That is, in the hopper 8, when the object to be crushed W2 crushed by the crusher 1 is discharged from the discharge port 3a of the housing 3, the object to be crushed W2 is received by the inclined surface 8a described above, and pulverized. The article W2 slides down the inclined surface 8a and is thrown into the inlet 7a of the pulverizer 5 connected to the lower end opening of the hopper 8.

  And since the door 9 is provided with the inspection window 9a, the inside of the hopper 8 can be visually recognized from the outside, and clogging of the to-be-ground material W2 in the hopper 8 and abnormality of the crusher 1 and the crusher 5 are easy. The door 9 can be opened and closed and the closed space A can be accessed from the outside, so that the clogging of the object to be crushed W2 in the hopper 8 is eliminated by opening the door 9. Or the inside of the hopper 8 can be inspected.

  Further, the hopper 8 is provided with a sensor 20 for detecting the accumulation of the object to be crushed W2 in the hopper 8. Specifically, the sensor 20 is provided on the side surface 8c of the hopper 8 at the upper side in FIG. If the light to be crushed W2 is excessively accumulated in the hopper 8 as a photoelectric sensor including the light projector 20a and the light receiver 20b provided on the lower side surface 8d of the hopper 8 in FIG. Is detected on the light receiver 20b side for a certain period of time or more, so that the accumulation of the object to be crushed W2 is detected.

  When the sensor 20 detects that the object to be crushed W2 has accumulated excessively in the hopper 8, the control device 21 stops the crusher 1 and the pulverizer 5, or stops the crusher 1 while stopping the crusher 1. In order to eliminate clogging of the pulverized product W2, the pulverizing rollers 6 and 6 of the pulverizer 5 are set to perform predetermined processing such as rotating in the opposite direction to the above.

  In other words, since it can be detected that the pulverized object W2 is excessively accumulated in the hopper 8, it is possible to detect the accumulation of the pulverized object W2 in the hopper 8, whether automatically or manually. Can be resolved promptly.

  Although the sensor 20 is a photoelectric sensor as described above, a sensor using another sense principle can be used as long as the accumulation of the object to be crushed W2 in the hopper 8 can be detected. It is.

  Although not shown in detail, the control device 21 includes a drive unit that drives the motors M1 and M2, and a control unit that sends various control commands to the drive units that drive the motors M1 and M2. M2, connected to the sensor 20, and upon receiving a signal from the sensor 20 that detects the accumulation of the object W2 to be crushed, the control unit generates a control command to perform a predetermined operation such as stopping or reverse rotation of the motors M1 and M2. And input to the drive unit.

  Returning, the crushing rollers 6 and 6 of the crusher 5 both have crushing teeth on the outer periphery, set the gap between the outer peripheries to about 0 to several mm, along the horizontal horizontal direction, and the rotation axis is The crushing roller 6 arranged on the left in FIG. 1 is rotated clockwise by the motor M2, and the crushing roller 6 arranged on the right in FIG. 1 is rotated counterclockwise by the motor M2, respectively. When the object to be crushed W2 crushed by the crusher 1 is introduced from the upper end side in FIG. 1 where the hopper 8 is installed, the object to be crushed W2 is guided between the pulverizing rollers 6 and 6 that are rotationally driven and pulverized. A finer fibrous object W3 after pulverization is discharged from a discharge port 7b provided at the lower end of the housing 7 in FIG.

  The pulverized product W3 that has been crushed and discharged from the lower side of the pulverizer 5 is conveyed to the outside of the base B by a conveyor C that is disposed further below the pulverizer 5 and installed in the base B. Yes.

  And in the crusher 1 in this Embodiment, since the crushing rollers 2 and 2 in FIG. 1 are arrange | positioned along the vertical up-down direction, especially the throwing into the crusher 1 of the elongate to-be-ground material W1 is horizontal. Although it can be carried out from the lateral direction, the charging operation becomes very easy. However, the crushing rollers 2 and 2 are not strictly arranged along the vertical vertical direction, and the crushing rollers 2 and 2 are arranged in the vertical vertical direction. 1 may be arranged up and down with a slight inclination. Even in the crusher 5, the crushing rollers 6 and 6 in FIG. 1 are arranged along the horizontal horizontal direction. The rollers 6 and 6 may not be arranged along the horizontal horizontal direction, and the crushing rollers 6 and 6 may be arranged horizontally with a slight inclination with respect to the horizontal horizontal direction.

  As can be understood from the above description, in the pulverizing apparatus according to the present embodiment, the large pulverized object W1 is first crushed by the crusher 1 and is sized so that it can be crushed by the crusher 5. Since the pulverizer 5 is disposed obliquely below the crusher 1, the pulverized object W <b> 2 is introduced into the hopper 8 from obliquely above the pulverizer 5.

  The material to be crushed W2 crushed by the crusher 1 and guided to the discharge port 3a by the rotation of the crushing rollers 2 and 2 is pushed out from the discharge port 3a by the material to be crushed W2 that is sequentially put into the crusher 1 and crushed. After falling onto the inclined surface 8a of the hopper 8 on the side of the crusher 1, it slides on the inclined surface 8a and is inserted between the crushing rollers 6 and 6 in the crusher 5, but the object to be crushed W2 is When sliding down the inclined surface 8a, the metal is collected by the magnets 11 and 12 installed on the inclined surface 8a, and the pulverized material W2 after the metal is removed is put into the pulverizer 5. The collected metal can be recovered by opening the door 9 after the pulverization operation is completed or in the middle thereof.

  Therefore, in the pulverizing apparatus according to the present embodiment, the operator can remove the metal in the object to be pulverized W1 before the object to be pulverized W2 is put into the pulverizer 5 without performing the operation of removing the metal in the object to be pulverized. Since the metal mixed in the pulverized product W2 can be efficiently collected and the opportunity for the metal to be charged into the pulverizer 5 can be reduced, the pulverizer 5 can be prevented from being deteriorated.

  The pulverizing apparatus is provided with an injector 10 for injecting the object W2 to be crushed into the hopper 8 with a gas to be injected and deposited in the discharge port 3a of the crusher 1. The two nozzles 10a and 10a which are inserted and fixed in through holes (not shown) provided on the upper and lower surfaces in FIG. 2 which are side portions of the discharge port 3a of the crusher 1 and jet gas, and the gas to the nozzles 10a and 10a. Compressor 10b serving as an air pressure source to be supplied, hose 10c connecting nozzles 10a, 10a and compressor 10b, and opening / closing provided in the middle of hose 10c so that communication between nozzle 10a and compressor 10b in north 10c can be selected and disconnected The compressor 10b and the opening / closing valve 10d can be manually driven and placed under the control of the control device 21. There. In this case, the compressor 10b sucks outside air and supplies compressed air to the nozzle 10a, but the type of gas is arbitrary.

  In this case, the nozzles 10a and 10a are attached at an angle facing the hopper 8 from the vicinity of the crushing rollers 2 and 2 on the upper and lower surfaces in FIG. The pulverized object W2 deposited on 3a can be introduced into the hopper 8 with the momentum of the gas injected.

  Therefore, when the compressor 10b is driven and the on-off valve 10d is opened by manual operation, when the gas is injected from the nozzle 10a, the object to be crushed W2 accumulated in the discharge port 3a can be introduced into the hopper 8 from the outside, and pulverization work Even during the operation, the accumulation of the object to be crushed W2 at the discharge port 3a can be eliminated safely and easily without interrupting the operation.

  Further, by performing the gas injection without stopping the driving of the pulverizer 5 after the pulverization operation is finished, the pulverized material W2 accumulated in the discharge port 3a is put into the hopper 8 and pulverized by the pulverizer 5. Since it is possible to prevent the object to be crushed W2 from remaining in the pulverizer, the object to be crushed W2 crushed by the crusher 1 at the inlet 7a of the pulverizer 5 inferior in processing amount forms a bridge. Opportunities can be suppressed, and the object to be pulverized W1 can be pulverized efficiently.

  In the operation of the on-off valve 10d, it is preferable that the on-off valve 10d can be remotely operated. For example, if a controller capable of operating the on-off valve 10d is installed in the vicinity of the pulverized material input base 4, The operator can easily operate the on-off valve 10d.

  Further, in this pulverization apparatus, a stop switch for the entire pulverization apparatus (not shown) is provided together with the operation switch, and when the control device 21 receives a signal output when the stop switch is pressed, The control device 21 drives the compressor 10b and the on-off valve 10d to inject gas.

  Further, when the control device 21 receives a signal of pressing the stop switch, it stops driving the motor M1 that drives the crusher 1 in parallel with the gas injection, but the motor M2 that drives the crusher 5 is stopped. The driving continues until a predetermined time elapses, and the motor M2 is stopped after the predetermined time elapses.

  That is, in this crushing apparatus, when the operator presses the stop switch to stop the crushing apparatus, the object to be crushed W2 that has been left behind in the conventional apparatus while being deposited on the discharge port 3a of the crusher 1 is automatically In addition, the injector 10 is activated to be put into the hopper 8 and the crushed material W2 accumulated by the pulverizer 5 which is continuously driven even after the crusher 1 is stopped is pulverized and pulverized in the pulverizer. The object to be crushed is not left behind.

  Therefore, in this crusher, when the crusher 1 is stopped, the injector 10 injects gas, and the crusher 5 continues to be driven until a predetermined time elapses after the crusher 1 is stopped. Therefore, when the pulverizer is stopped, it is possible to surely prevent the pulverized material that is not pulverized from remaining in the pulverizer, and to be pulverized by the pulverizer 1 at the inlet 7a of the pulverizer 5 that is inferior in throughput. The opportunity for the object W2 to form a bridge can be reliably suppressed. Further, in addition to being able to efficiently pulverize the object to be pulverized W1, the process is automatically performed, so that there is no need to bother the operator, and the pulverized object W2 remains in the pulverizing apparatus due to human error. Can be prevented.

  The control device 21 includes, as hardware resources, for example, a CPU (Central Processing Unit), a RAM (Synchronous Dynamic Random Access Memory) that provides a storage area for the CPU, and a CPU for performing the processing of each unit described above. ROM (Read Only Memory) that stores programs such as applications to be executed and operating system, drive circuit that actually drives the motor, CPU, RAM, ROM, sensor 20, stop switch, and the above drive circuit are communicably connected If the configuration of each part of the control device 21 is realized by executing an application program for the CPU to perform the process of each part, Good. Moreover, the said structure is an example of 1 structure of the control apparatus 21, and you may employ | adopt another structure and implement | achieve said operation | movement.

  In this embodiment, the nozzle 10a is installed on the side surface of the discharge port 3a with an angle toward the hopper 8 side. However, the nozzle 10a is injected into the discharge port 3a of the crusher 1 by gas injection from the injector 10. The accumulated object W2 may be attached so that it can be dropped into the hopper 8, and the attachment position is arbitrary as long as it does not interfere with the dropping of the object W2 into the hopper 8. The object to be crushed W2 deposited on the discharge port 3a may be dropped into the hopper 8 by the gas flow that has been jetted and reflected to the crushing rollers 2 and 2, and the pulverized object W2 is dropped into the hopper 8 in the injection direction. Is optional as long as possible. Further, two or more nozzles 10a may be provided, or one nozzle 10a may be provided.

  The motors M1 and M2 are used to drive the crushing rollers 2 and 2 and the crushing rollers 6 and 6, but a hydraulic motor can also be used. Furthermore, the crusher 1 is not limited as long as the size of the pulverized object W1 can be pulverized by the pulverizer 5, and the pulverized object W2 can be further pulverized in the pulverizer 5. Since it is only necessary to pulverize to W3, it is a matter of course that the specific configurations of the crushing roller 2 and the crushing roller 6 are not limited to those described above.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a schematic side sectional view of a crusher in one embodiment. It is a schematic plan view of the grinding | pulverization apparatus in one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crusher 2 Crushing roller 2a Shaft 2b Crushing teeth 3, 7 Housing 3a, 7b Discharge port 4 Object to be crushed 5 Crusher 6 Crushing roller 7a Input port 8 Hopper 8a Inclined surface 8b in hopper Opposing surfaces 8c, 8d Side 8e in the hopper 9 Top 9 in the hopper Door 9a in the hopper Lookout window 10 in the hopper Injector 10a Nozzle 10b Air pressure source compressor 10c Hose 10d On-off valve 11, 12 Magnet 20 Sensor 20a Floodlight 20b Light receiver 21 Control device A Closed space B Base C Conveyor L1, L2 Leg M1, M2 Motor P1, P2 Top plate W1, W2, W3

Claims (4)

A pair of crushing rollers arranged in parallel vertically is rotated to crush the object to be crushed between the crushing rollers, and a pair of crushing rollers installed obliquely below the crushing machine and arranged side by side are rotated. A pulverizer that pulverizes the material to be crushed by the crusher between the crushing rollers and a material to be crushed by the crusher that is provided between the crusher and the crusher and receives the material to be crushed. A pulverizing apparatus comprising a hopper, wherein the pulverizer includes an injector for injecting a material to be crushed, which is deposited at a discharge port of the crusher, with a gas to be injected into the hopper. The pulverizer according to claim 1, wherein the sprayer injects gas when the crusher is stopped, and the pulverizer continues to drive until a predetermined time elapses after the crusher is stopped. The pulverizer according to claim 1 or 2, wherein the injector includes a nozzle for injecting gas and an air pressure source for supplying gas to the nozzle. The crusher according to any one of claims 1 to 3, wherein the hopper forms a closed space connecting the discharge port of the crusher and the input port of the crusher.

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