Patent Publication Number: US-11027285-B2

Title: Vertical shaft impact crusher and rotor thereof

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the priority of Korean Patent Application No. 10-2014-0070685, filed on Jun. 11, 2014 in the KIPO (Korean Intellectual Property Office). Further, this application is the National Phase application of International Application No. PCT/KR2015/005824 filed Jun. 10, 2015, which designates the United States and was published in Korean. Both of the priority documents are hereby incorporated by reference in their entireties. 
     TECHNICAL FIELD 
     The present invention relates to a vertical shaft impact crusher which accelerates a rock or a mineral by a rotor, which is installed on the upper end of a vertical shaft rotating at a high speed, to a high speed such that the rock or mineral collides with a stationary wall to be crushed and, more specifically, to a vertical shaft impact crusher including a rotor protective layer which is made of particles of a crushed object and formed inside the rotor. 
     BACKGROUND ART 
     A machine, which crushes a rock or a mineral not by using a compression force but by using an impact force generated when the rock or mineral collides with an object at a relative speed with respect to the object, is called an impact crusher. There are many kinds of impact crushers and the impact crushers are widely used in industrial fields. 
     Among them, a machine, which has a vertical shaft rotating at a high speed and a rotator installed on the upper end of the vertical shaft, and crushes an object to be crushed by accelerating the object to be crushed at a high speed, when the object to be crushed is inserted into the crusher, and making the object be crushed collide with a stationary or low speed object, is called a vertical shaft impact crusher. In the vertical shaft impact crusher, the rotor is installed horizontally, and the object to be crushed is finally accelerated in a horizontal direction and comes out of the rotor to collide. 
     The vertical shaft impact crusher is classified into a first kind in which the object to be crushed is brought into a direct contact with an object constituting the rotor to receive the impact force, and a second kind in which a rotor protective layer made of particles of the object to be crushed is formed in the rotor and the object to be crushed touches the rotor protective layer to receive the impact force. 
     As for the first kind of the vertical shaft impact crusher, an impact plate constituting the rotor is worn at a high speed by a crystal component included in a rock, which restricts the use of the vertical shaft impact crusher into the use for crushing relatively large particles or the use for crushing a rock or a mineral with a very low hardness such as a limestone. 
     The vertical shaft impact crusher of the second kind having a rotor with a protective layer for protecting the rotor formed therein experiences less wear even when a rock or a mineral with a high hardness is crushed thanks to the existence of the protective layer, and, therefore, it is widely used for the use (e.g. production of sand) for crushing an object with relatively small particles into even smaller pieces. 
     However, even in the second kind of rotor, a rotor component at an end portion of the protective layer is also exposed to a severe wear, so this component is usually made of a material with a high hardness such as an extra hard alloy. 
     On the other hand, the extra hard alloy is very expensive and much effort is required to elongate a using lifetime of this rotor component. For example, there is a method of dividing the extra hard alloy component into  3  or  4  pieces and, when one of the pieces is worn more than the rest of them, changing an arrangement sequence of the pieces such that the extra hard alloy component, which has been worn more, is replaced with the extra hard alloy component experiencing less wear. 
     However, even when this method is used, troubles still remain and operation efficiency is very low since a great amount of time is needed to disassemble the components and change the arrangement sequence, and a dynamic balance of the rotor is broken after changing the arrangement sequence since a shape of the protective layer is also changed. 
     This will be explained in more detail by referring to  FIG. 1 .  FIG. 1  is an illustration of a rotor used in the conventional vertical shaft impact crusher, and is shown without an upper cover of the rotor such that an inner portion of the rotor can be seen. 
     A rotor  80  consists of a rotor lower plate  81 , a rotor side wall  82  which is partitioned into a few sections, and partitions  83 . A tip portion  821  of the partitioned rotor side wall  82  in a rotating direction is formed to be thick and strong, and a concave engraved portion  8211  with a rectangular pillar-like shape is vertically formed on an outer portion of the rotor side wall such that a head (disposed outside of the side wall) of a coupling bolt  823 , which couples a rotor tip plate  822  with the tip portion  821 , is hidden inside the engraved portion. According to this configuration, it is possible to prevent the object to be crushed, which intermittently flies from outside the rotor back toward the rotor, from colliding with the heads of the coupling bolts and wearing the heads of the coupling bolts. Also, a planar portion  8212  is formed on an inner side surface of the tip portion  821  such that a rotor tip plate  822  with a corresponding planar shape is firmly attached to the planar portion by means of the coupling bolts  823 . 
     A tip portion  8221  of the rotor tip plate  822  is formed to be thicker than a plate-shaped portion and a rectangular bar-shaped groove is formed on the tip portion, such that an extra hard alloy tip  8222  is fitted into the groove to be firmly engaged with the tip portion. 
     Particle-shaped rocks, etc. are forcefully pushed against the partition  83  by a centrifugal force, and one end (counter-rotation direction portion) and the other end (rotation direction portion) are supported by a base plate  831  of the partitions  83  and the rotor tip plate  822 , respectively. The rocks, which were forcefully pushed, then form a protective layer  84  while forming a unique wave-shaped curve. This protective layer  84  deposited within the rotor comes to steadily rotate with the rotor without being accelerated toward outside of the rotor to escape from the rotor. A shape of the wave-shaped curve of the protective layer  84  is determined by an inner frictional angle between the centrifugal force and the particle-type object to be crushed. 
     After the protective layer  84  is formed, a rock, which is newly inserted into the rotor and accelerated by the centrifugal force, collides with the protective layer  84  and moves in the rotating direction along the curve of the protective layer  84 , and then is accelerated toward outside the rotor to escape from the rotor at the other end. 
     The extra hard alloy tip  8222  forms a tip portion of the rotating direction portion of the protective layer  84  and is exposed to a strong wearing environment since the particles of the object to be crushed pass by the extra hard alloy tip while being forcefully pushed against it. 
     By the way, according to many years&#39; observations of the inventor of this patent application using this type of rotor, the inventor found that the wear of the extra hard alloy tip  8222  never happens uniformly along a length direction of the extra hard alloy tip  8222  in a vertically elongated shape. Rather, the wear begins as shown in  FIG. 2  ( FIG. 2  represents an initial wear state of the extra hard alloy tip) and, although a rough position of a wear start portion (W 1 ) can be predicted, the exact position cannot be specified. Also, when the wear begins at one end, a concave valley-like portion with a shape corresponding to a worn portion is also formed at the protective layer  84 , which is formed behind the worn extra hard alloy tip portion (W 1 ), and after this valley is formed on the protective layer, the particle-shaped object to be crushed tends to move into the valley of the protective layer  84  and move through it intensively. As a result, the extra hard alloy tip gradually experiences wear as shown in  FIG. 3  ( FIG. 3  is a perspective view illustrating a continuing wear state of the extra hard alloy tip), that is, the wear rapidly progresses while intensively forming a deep groove (W 2 ) at the wear start portion in a non-uniform manner. This local wear is the biggest factor which prevents an efficient use of the extra hard alloy tip and makes the protective layer deposit in an irregular shape, which incurs a strong vibration in the rotor rotating at a high speed. Therefore, the extra hard alloy tip  8222  should be replaced frequently. 
     In addition to the aforementioned problems, as for the rotor  80 , since the object to be crushed, which falls from an upper portion into the rotor  80 , sequentially touches a distribution cone  85 , falls, touches the rotor lower plate  81 , and then collides with the protective layer  84  while experiencing friction, the rotor lower plate also comes to be worn very quickly. Although a few wear-resistant pad plates  86  are arranged on the rotor lower plate  81  in order to prevent this wear, these plates also need to be replaced frequently, which raises a manufacturing cost and lowers a manufacturing efficiency. 
     Meanwhile, the conventional known rotors can be found in the Utility Model Publication No. 2013-6306, the Patent Registration No. 545788, the Patent Publication No. 1997-61364, and the Patent Publication No. 2013-13913, which were filed in the Korean Industrial Property Office (KIPO). 
     DISCLOSURE 
     Technical Problem 
     The present invention is devised to solve the problems of the conventional vertical shaft impact crusher described above which forms a protective layer inside a rotor. An objective of the present invention is to provide a rotor which can accurately control a behavior of an object to be crushed within the rotor by forming a valley-shaped protective layer uniformly at a set position, rather than enabling the protective layer to develop by occasion due to the wear of a predetermined component in the rotor, by using a phenomenon that, when the valley-shaped protective layer is formed, particles of the object to be crushed are moved into the valley and move through the valley intensively, and a vertical shaft impact crusher having the rotor. 
     Also, another objective of the present invention is to provide a rotor, which does not generate vibrations even when the rotor rotates at a high speed, by uniformly forming the protective layer with a shape corresponding to a center of rotation of the rotor, and a vertical shaft impact crusher having the rotor. 
     Furthermore, a still another objective of the present invention is to provide a rotor which is designed such that a rotor protective layer is formed in a uniform shape, and can increase economic feasibility of a wear-resistant tip by reducing the size of a wear-resistant tip itself by predicting a portion, which will be worn intensively, and enabling the wear to develop only at the predicted local portion, and maximize the utilization efficiency of the wear-resistant tip by enabling the wear-resistant tip to experience the uniform wear, and a vertical shaft impact crusher having the rotor. 
     In addition, a still another objective of the present invention is to provide a rotor which can be easily maintained by exposing only the components, which can be easily replaced, to the wearing environment, and a vertical shaft impact crusher having the rotor. 
     Also, a still another objective of the present invention is to provide a rotor having an installation configuration of a wear-resistant tip, which can be utilized to experience the uniform wear, and a vertical shaft impact crusher having the rotor. 
     Furthermore, a still another objective of the present invention is to provide a rotor, whose worn components are easily replaced without destructing a protective layer formed inside the rotor during a replacement process, and which can be directly utilized for crushing without a separate stabilizing process after the replacement process, and a vertical shaft impact crusher having the rotor. 
     In addition, a still another objective of the present invention is to provide a rotor which can not only adjust a path for the object to be crushed accurately but also adjust a wearing portion of an extra hard alloy tip accurately, by forming a small funnel-shaped protective layer at a center portion of the rotor where the object to be crushed falls from an upper portion into the rotor and touches the rotor, in order to prevent the object to be crushed from touching a bottom of the rotor before touching the protective layer formed on a rotor side wall, such that the object to be crushed is prevented from touching the rotor bottom by enabling the object to be crushed, which touches the funnel-shaped protective layer, to have a rising speed vector while gaining a small speed, and the object to be crushed, which leaves the funnel-shaped protective layer, accurately reaches the valley portion of the valley-shaped protective layer engraved on the side wall through the air, and a vertical shaft impact crusher having the rotor. 
     Technical Solution 
     In order to accomplish the aforementioned objectives, the present invention provides a rotor  5  for a vertical shaft impact crusher which rotates about a rotation shaft extending in a vertical direction and accelerates an object to be crushed by a centrifugal force, comprising: a rotor upper plate  55  including a rotor upper plate hole  551  which is an inlet for the object to be crushed, which is inserted into the rotor, and forms an upper portion of the rotor; a rotor lower plate  53  which is disposed under the rotor upper plate to be spaced apart from the rotor upper plate and forming a bottom of the rotor; a rotor side wall  54  which is arranged between the rotor upper plate and the rotor lower plate to be coupled with the rotor upper plate and the rotor lower plate, and disposed at a position spaced apart from a rotation center of the rotor; and a circular hole  541  which is formed on the rotor side wall  54  and is an outlet, through which the object to be crushed accelerated by the rotor comes out of the rotor. 
     The shape of the rotor should not necessarily be circular, and the rotor can take various shapes such as a triangle, a quadrangle, and a hexagon, etc. in the condition that the shapes do not cause vibration while the rotor rotates. Also, circular holes can be formed in the number corresponding to the number of edges of these polygons. 
     Here, the circular holes  541  can be formed at the same height equidistantly along an outer periphery of the rotor side wall  54 . 
     Here, a wear-resistant tip with a hardness greater than that of the rotor side wall  54  can be detachably installed in a 3 o&#39;clock direction or a 9 o&#39;clock direction of the circular holes  541 . 
     Here, a wear-resistant tip ring  546 , which has a hardness greater than that of the rotor side wall  54  can be detachably installed at a circumference of the circular hole  541 , and the wear-resistant tip ring can be installed at different azimuth angles with respect to the circular hole  541 . 
     Here, an inner diameter of the wear-resistant tip ring  546  is configured to be smaller than an inner diameter of the circular hole  541 . 
     Here, the wear-resistant tip ring  546  can be coupled with a wear-resistant tip ring housing  543  and the wear-resistant tip ring housing  543  can be engaged with the circumference of the circular hole  541 , which results in the wear-resistant tip ring  546  being installed on the circumference of the circular hole. 
     Here, the wear-resistant tip ring  546  is coupled with an end portion close to a center of the rotor at an inner diameter portion of the wear-resistant tip ring housing  543 . 
     Here, a plurality of tap holes  5421  are formed at the circumference of the circular hole, a plurality of bolt holes  5431  are also formed on the wear-resistant tip ring  546  or the wear-resistant tip ring housing  543  with which the wear-resistant tip ring housing  543  is engaged, and, even when the azimuth angle of the wear-resistant tip ring  546  or the wear-resistant tip ring housing  543  with which the wear-resistant tip ring  546  is engaged varies, at least some of the tap holes  5421  and the bolt holes  5431  are mated with one each other to engage coupling bolts  545 , which can enable the wear-resistant tip ring  546  or the wear-resistant tip ring housing  543  with which the wear-resistant tip ring  546  is engaged to be installed on the circumference of the circular hole. 
     Here, a wear-resistant tip ring housing support ring  542 , which is separably coupled with the wear-resistant tip ring  546  or the wear-resistant tip ring housing  543  with which the wear-resistant tip ring  546  is engaged, can be coupled with the rotor side wall  54  in one entity at an inner diameter portion of the circular hole  541 . 
     Here, the wear-resistant tip ring  546  or the wear-resistant tip ring housing  543  with which the wear-resistant tip ring  546  is engaged can be engaged with the circumference of the circular hole  541  from outside the rotor side wall  54 . 
     Here, a partition ring  544  can be sandwiched at a plane, wherein the circumference of the circular hole  541  of the rotor side wall  54  or the wear-resistant tip ring housing support ring  542 , which is engaged with the circumference of circular hole  541  in one entity, and the wear-resistant tip ring  546  or the wear-resistant tip ring housing  543  with which the wear-resistant tip ring  546  is engaged faces each other with the plane between them. 
     Here, the rotor can be configured such that an outer diameter of the partition ring  544  is greater than the circumference of the circular hole  541  or the wear-resistant tip ring housing support ring, which is engaged with the circumference of circular hole  541 , and an inner diameter of the partition ring  544  is smaller than the inner diameter of the circular hole  541  or the wear-resistant tip ring housing support ring  542 , which is engaged with the circumference of the circular hole  541  in one entity, and is equal to or smaller than the inner diameter of the wear-resistant tip ring  546 . 
     Here, the rotor can be configured such that a distribution tube  56  is installed to protrude upward at a predetermined position between the center and an end portion of the rotor lower plate  53 , wherein a height of an upper end of the distribution tube  56  is lower than the center of the circular hole  541 . 
     Here, the rotor can be configured such that the distribution tube  56  includes a lower distribution tube  561  and an upper distribution tube  562  which is separably coupled with the lower distribution tube  561 . 
     Here a distribution tube top lining  5622  having a hardness greater than that of the distribution tube can be installed on the upper end of the distribution tube  56 . 
     Here, the distribution tube includes a distribution tube bottom plate  5613 , and a distribution tube bottom lining  5615  can be installed on a center of the distribution tube bottom plate  5613 . 
     In addition, according to the present invention, an equilateral polygon hole  59  can be formed instead of the aforementioned circular hole  541 , and the rotor can be configured such that, when viewed in a vertical direction, the rotor side wall  54  area exists at areas between the equilateral polygon hole  59  and the rotor upper plate  55  and between the equilateral polygon hole  59  and the rotor lower plate  53 . 
     Also, along with the case with the circular hole, a wear-resistant tip ring  546 , which has an equilateral polygon shape corresponding to the shape of the equilateral polygon hole  59  and is smaller than the equilateral polygon hole  59 , is detachably installed to be overlapped with the equilateral polygon hole  59 , and the wear-resistant tip ring can be installed at different azimuth angles with respect to the equilateral polygon hole  59 . 
     Also, along with the case with the circular hole, the rotor can be configured such that a partition ring  544  is sandwiched at a plane, wherein the circumference of the equilateral polygon hole  59  of the rotor side wall  54  and a wear-resistant tip ring  546  or a wear-resistant tip ring housing  543 , with which the wear-resistant tip ring  546  is engaged, faces each other with the plane between them, and wherein an outer periphery of the partition ring  544  is larger than the equilateral polygon hole  59 , and an inner periphery of the partition ring  544  is smaller than the equilateral polygon hole  59  and equal to or greater than an inner periphery of wear-resistant tip ring  546 . 
     Also, along with the case with the circular hole, the rotor can be configured such that a distribution tube  56  is installed to protrude upward at a predetermined position between the center and an end portion of the rotor lower plate  53 , wherein a height of a top of the distribution tube  56  is lower than half the height between the rotor lower plate  53  and the rotor upper plate  55 . 
     In addition, in order to accomplish the aforementioned objectives, the present invention provides a rotor  5  for a vertical shaft impact crusher which rotates about a rotation shaft extending in a vertical direction and accelerates an object to be crushed by a centrifugal force, comprising: a rotor upper plate  55  including a rotor upper plate hole  551  which is an inlet for the object to be crushed, which is inserted into the rotor, and forms an upper portion of the rotor; a rotor lower plate  53  which is disposed under the rotor upper plate to be spaced apart from the rotor upper plate and forms a bottom of the rotor; a rotor side wall  54  which is arranged between the rotor upper plate and the rotor lower plate to be coupled with the rotor upper plate and the rotor lower plate, and disposed at a position spaced apart from a rotation center of the rotor; a hole ( 541 ,  69 ) which is formed on the rotor side wall  54 , wherein the object to be crushed accelerated by the rotor comes out of the rotor through the hole; and a distribution tube  56  which is installed to protrude upward at a predetermined position between a center and an end portion of the rotor lower plate  53 , 
     wherein the distribution tube  56  includes a lower distribution tube  561  and an upper distribution tube  562  or an upper ring  563  which is separably coupled with the lower distribution tube. 
     Here, a distribution tube top lining  5622  can be installed on the upper end of the upper distribution tube  562  or the upper ring  563 . 
     Here, a coupling flange  5611  is formed in an outward direction on the upper end of the lower distribution tube  561 , and a coupling flange  5621  or a coupling surface  5631  can be formed to correspond to the coupling flange  5611  under the upper distribution tube  562  or at an outer diameter of the upper ring  563 . 
     In addition, in order to accomplish the aforementioned objectives, the present invention provides a vertical shaft impact crusher comprising: the aforementioned rotor; a shaft  42  which is vertically installed to be coupled under a center of the rotor and rotates in one entity with the rotor; an upper frame  11 ; a lower frame  12  which has a diameter smaller than that of the upper frame  11  and is installed under the upper frame  11 ; and a stepwise portion  111  which is installed at a diameter difference portion between the upper frame and the lower frame. 
     Advantageous Effects 
     The vertical shaft impact crusher according to the present invention has the following effects: 
     First, a replacement period of an expensive extra hard alloy tip is elongated by a few times. 
     Second, the vibration of a rotor is prevented. 
     Third, various portions except for a rotor aperture is prevented from being worn. 
     Fourth, an efficient manufacturing process can be facilitated. 
     Fifth, the configuration of the rotor is simple and the manufacturing cost can be reduced 
     Sixth, the maintenance of the rotor is simple and straightforward. 
     Detailed effects along with the aforementioned effects of the present invention will be described while explaining the embodiments of the present invention enough such that the embodiments can be practiced. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is an illustration of a rotor used in the conventional vertical shaft impact crusher, and is shown without an upper cover of the rotor such that an inner portion of the rotor can be seen, 
         FIG. 2  is a perspective view illustrating an initial wear state of the extra hard alloy tip of  FIG. 1 , 
         FIG. 3  is a perspective view illustrating a wear progress state of the extra hard alloy tip of  FIG. 2 , 
         FIG. 4  is a cross-sectional view of a vertical shaft impact crusher according to a preferred embodiment of the present invention, 
         FIG. 5  is a plan view seen from above after the rotor is cut along a line A-A of  FIG. 4 , 
         FIG. 6  is a front plan view of the rotor of  FIG. 4 , 
         FIG. 7  is a front plan view illustrating the extra hard alloy tip ring which is coupled with a wear-resistant tip ring housing of  FIG. 6 , 
         FIG. 8  is a cross-sectional view of  FIG. 7  along a line C-C, 
         FIG. 9  is an expanded view of a B portion of  FIG. 4 , 
         FIG. 10  is a front plan view of a rotor according to another embodiment of the present invention. 
         FIG. 11  shows another embodiment of the rotor according to the present invention, and 
         FIG. 12  is another embodiment of a distribution tube which is installed on the rotor according to the present invention. 
     
    
    
     BEST MODE 
     In the following, preferred embodiments of a vertical shaft impact crusher according to the present invention and a rotor used in the vertical shaft impact crusher are explained in detail by referring to the appended figures. 
     It is to be noted that the present invention is not restricted to the embodiments disclosed in the following and can be realized in various different configurations, and the embodiments are provided to fully disclose the present invention and help a person with an ordinary skill in the art completely understand the categories of the present invention. 
       FIG. 4  is a cross-sectional view of a preferred embodiment of the present invention,  FIG. 5  is a plan view seen from above after the rotor is cut along a line A-A of  FIG. 4 ,  FIG. 6  is a front plan view of the rotor of  FIG. 4 ,  FIG. 7  is a front plan view illustrating the extra hard alloy tip ring which is coupled with a wear-resistant tip ring housing of  FIG. 6 ,  FIG. 8  is a cross-sectional view of  FIG. 7  along a line C-C, and  FIG. 9  is an expanded view of a B portion of  FIG. 4 . 
     [Frame] 
     When referring to  FIG. 4 , the vertical shaft impact crusher as one embodiment of the present invention comprises a frame  1 . The frame  1  consists of an upper frame  11  and a lower frame  12 . The upper frame  11  and the lower frame  12  has a cylindrical shape and a diameter of the upper frame  11  is greater than a diameter of the lower frame  12 . Also, a stepwise portion  111  is formed under the upper frame  11  with a width corresponding to a height difference between the upper frame and the lower frame. An object to be crushed, which is accelerated by a rotor to be explained in the following and comes out of the rotor, accumulates on the stepwise portion  111  to form a stoppage protective layer  112  of the upper frame  11  as shown in the figure. 
     An upper cover  2  is coupled on the upper frame  11  to block an inner space of the upper frame from outside. The upper cover  2  consists of an upper cover plate  21 , whose end portion is engaged on the upper frame, a hopper  22 , which is formed at a center portion of the upper cover plate to guide the object to be crushed into the frame, and an injection chute  23  which extends downwards from a bottom of the hopper and serves as a guide for inserting the object to be crushed into the rotor  5  to be explained in the following. 
     A pulley chamber  3 , which is formed in a shape corresponding to an inverted channel, is arranged inside a lower end portion  121  of the lower frame  12 , and an aperture (not shown in the figure) is formed by removing a portion of the lower frame  12  at one side end of the pulley chamber  3 , such that a V belt (not shown in the figure) is introduced from an operation means outside the frame to be connected with a pulley  6  which is disposed inside the pulley chamber  3 . A pulley chamber upper plate  31 , which is made of a rigid iron plate, is formed on the pulley chamber  3  to cover the pulley chamber, and a circular pulley chamber upper plate hole  311  is formed at a center portion of the pulley chamber upper plate. 
     [Rotation Shaft Assembly] 
     A rotation shaft assembly  4  is firmly engaged on the pulley chamber upper plate  31  by means of a bearing housing assembly bolt  415 . More specifically, the rotation shaft assembly  4  includes a vertically arranged shaft  42  and a bearing housing  41  enclosing the shaft  42 , and a flange, which is formed at a lower end portion  412  of the bearing housing, is engaged with the pulley chamber upper plate  31  by means of the bearing housing assembly bolt  415 , such that the rotation shaft assembly  4  is firmly fixed on the pulley chamber upper plate  31 . If a stepped portion protruding downward is formed on the flange, which is formed on the lower end portion  412  and the stepped portion is inserted into the pulley chamber upper plate hole  311 , a position of the bearing housing  41  can be easily aligned with respect to the pulley chamber upper plate  31  and an engaging force between the bearing housing  41  and the pulley chamber upper plate  31  can be increased. 
     An upper bearing  413  is installed on an upper end portion  411  of the bearing housing  41 , while a lower bearing  414  is installed on a lower end portion  412  of the bearing housing  41 , and upper and lower portions of the shaft  42 , which are inserted into the bearing housing  41 , are supported by the upper bearing  413  and the lower bearing  414 , respectively, while rotating in the bearing housing  41 . 
     Also, an upper end and a lower end of the shaft  42 , which are inserted into the bearing housing  41 , protrude upward and downward more than the top and bottom of the bearing housing  41 , respectively. 
     The pulley  6  is installed at the lower end of the shaft  42  protruding downward, and the pulley  6  is arranged in the pulley chamber  3  through the aforementioned pulley chamber upper plate hole  311 . Since the pulley  6 , which is arranged in the pulley chamber  3 , is isolated from the inner space of the frame  1  by means of the pulley chamber upper plate  31 , it is possible to prevent the object to be crushed, which is crushed near the stoppage protective layer  112  of the upper frame  11 , from entering the pulley chamber  3  to affect the operation of the pulley  6 . 
     The rotor to be explained in the following is engaged with the upper end of the shaft  42  which protrudes upward. 
     Meanwhile, a labyrinth seal for preventing dusts or an oil seal for maintaining grease is installed on the upper end, the lower end, etc. of the bearing housing  41 ; however, more detailed explanation on them is omitted since these are commonly known components widely used in the rotation shaft configuration. 
     [Rotor] 
     A rotor  5  is coupled with the upper end of the shaft  42  such that a center of the rotor  5  is aligned with a center of a rotation axis. Thus, the rotation shaft, which is the center of the rotor  5 , is aligned with the rotation axis of the shaft  42 , and the rotor  5  rotates in one entity as the shaft  42  rotates. 
     When looking further into the coupling configuration, the rotor  5  includes a rotor boss  52  at a lower center portion thereof, and a shaft coupling bolts  521  couple the rotor boss  52  with the shaft  42 . A rotor lower plate  53  is coupled with the rotor boss  52 , which is coupled with the shaft  42 , by means of a rotor coupling bolt  51 , which results in the rotor  5  being coupled with the shaft  42 . A lower end of the rotor boss  52  has a shape for covering the upper portion  411  of the bearing housing  41  as shown in  FIG. 4 , and thus prevents fragments, etc. of a crushed rock from entering the bearing housing  41 . It is needless to mention that a lower end of the rotor boss  52  is spaced apart from the upper end portion  411  of the bearing housing  41  by a tiny gap, and therefore there is no interference between the lower end of the rotor boss  52  and the upper end of the bearing housing  41  when the rotor boss rotates. 
     The rotor boss  52  has a stepped portion, which protrudes upward, and an annular inner circumferential surface of the rotor lower plate  53  is inserted into and coupled with the stepped portion as shown in  FIG. 4 . This configuration is similar to the coupling configuration for the aforementioned stepped portion of the bearing housing lower end portion  412  and the pulley chamber upper plate hole  311 , and also provides the effects of an easy alignment as well as a strong engagement force between two components. 
     A rotor side wall  54  with a circular cylinder shape is coupled with a circumference of the circular rotor lower plate  53  by the conventional method, and an end portion of the circular (more strictly, annular) rotor upper plate  55  is also coupled with the upper end of the rotor side wall  54  by the conventional method. A plurality of circular holes  541  are equidistantly formed at the same height on a perimeter of the rotor side wall  54 . Also, a circular rotor upper plate hole  551  is formed at a center portion of the rotor upper plate  55 , and the aforementioned injection chute  23  penetrates a little into the rotor upper plate hole  551  as shown in  FIG. 4 . Since the injection chute  23  is stationary and the rotor upper plate  55  rotates, it is needless to mention that it is preferred that the injection chute  23  does not touch or interfere with an inner circumferential surface of the rotor upper plate hole  551  of the rotor upper plate  55 . 
     A distribution tube  56  is firmly coupled with an upper surface of the rotor boss  52 , which is disposed immediately under the injection chute  23 , by means of a distribution tube coupling bolts  5614 . The distribution tube  56  has a shape such that a bottom of the distribution tube is blocked and the distribution tube has a sidewall of a circular cylinder shape along a perimeter thereof. The distribution tube coupling bolts  5614  penetrates a bolt hole formed at a distribution tube bottom plate  5613 , which forms the bottom of the distribution tube  56 , to be engaged with the upper surface of the rotor boss  52 . Here, the distribution tube coupling bolts  5614  penetrate the distribution tube bottom plate  5613  and are located to be near the sidewall. Then, head portions of the distribution tube coupling bolts  5614  are hidden inside the distribution tube protective layer  564 , which is to be explained in the following, which prevents the head portions of the distribution tube coupling bolts  5614  from being worn by the object to be crushed which is inserted into the rotor. 
     A portion, which forms the sidewall of the distribution tube  56 , is divided into a lower distribution tube  561  and an upper distribution tube  562  as shown in  FIG. 9 . And, coupling flanges  5611  and  5621  with a shape protruding outward are formed at a portion where the lower distribution tube  561  and the upper distribution tube  562  meet each other. Therefore, the lower distribution tube  561  and the upper distribution tube  562  are stacked one over the other to be coupled with each other by engaging the coupling flanges  5611  and  5621  with each other by means of the upper and lower distribution tube coupling bolts  5666 . Since the coupling flanges are formed outside at a lower position than the upper end of the upper distribution tube, no object to be crushed flies to collide with the coupling flanges. 
     When the rotor rotates and the object to be crushed is inserted into the rotor, the crushed object accumulates in a funnel-like shape by the centrifugal force within the distribution tube  56  to form the distribution tube protective layer  564  as shown in  FIG. 4 . This distribution tube protective layer  564  completely prevents the crushed object from touching the bottom of the rotor, and thus protects the bottom of the rotor from wearing. 
     The distribution tube protective layer  564  is not formed at a center portion of the distribution tube bottom plate  5613  and the center portion is exposed. Then, the distribution tube bottom lining  5615  made of an extra hard alloy, etc. can be formed on the upper surface of the center portion, such that the center portion of the distribution tube bottom plate  5613  can be protected from being worn by the object to be crushed which is inserted through the injection chute  23 . 
     Also, a distribution tube top lining  5622  made of an extra hard alloy, etc. is also formed on an upper inner circumferential surface of the upper distribution tube  562  among a vertical tube portion of the distribution tube  56 . Since a diameter of the distribution tube is not large, a main speed (a linear velocity of the vertical tube portion of the distribution tube) is not high even when the rotor  5  rotates at a normal speed. Therefore, the wearing operation due to the collision of the crushed object is also weak. As a result, a lifespan of the rigid linings  5615  and  5622 , which are applied on the distribution tube  56 , comes to be very long. When the lifespan is explained in more detail, it can be said that the distribution tube top lining  5622 , which is spaced apart from the center of the rotor by a small distance, usually experiences more wearing. The reason of dividing the sidewall portion of the distribution tube into the upper distribution tube and the lower distribution tube is that, when the lining  5622  formed at an upper inner circumferential surface of the upper distribution tube  562  is completely worn out, only the upper distribution tube portion can be replaced without replacing a whole part of the distribution tube  56 . The technical feature to be noted here is that, when the distribution tube  56  consists of the upper distribution tube and the lower distribution tube as separate entities as for the present invention, convenience is improved by only replacing the upper part of the distribution tube, and there is no need to break down the distribution tube protective layer  564  in order to access the head portion of the distribution tube coupling bolts  5614  which are hidden in the distribution tube protective layer  564 . That is to say, by adopting a configuration in which the upper part of the distribution tube  56  can be replaced separately, it is possible to minimize the degree of breakdown of the distribution tube protective layer  564  during the replacement process of the distribution tube. As a result, according to the present invention, since each of the aforementioned rigid linings can be replaced separately according to the degree of wearing, utilization efficiency of the linings is improved, and replacement and maintenance processes can be facilitated due to the improved configuration. 
     Although  FIG. 4  and  FIG. 9  illustrate the distribution tube  56 , which is divided into two portions, that is, the lower distribution tube  561  and the upper distribution tube  562 , the configuration, in which the distribution tube  56  is divided into two parts such that portions to be replaced can be replaced separately, is not restricted to the shown embodiments. For example, it is also possible to configure the distribution tube to be divided into a lower distribution tube  561  and an upper ring  563  as shown in  FIG. 12 . The distribution tube shown in  FIG. 12  is different from the distribution tubes shown in  FIG. 4  and  FIG. 9  by the shapes of the upper ring  563  and the upper distribution tube  562  which constitute the upper portion. The upper ring  563  has a planar circular ring shape and a coupling surface  5631 , which is engaged with a coupling flange  5611  of the lower distribution tube  561 , is formed at an outer diameter of the ring. Also, an inner diameter of the upper ring  563  is equal to or smaller than the inner diameter of the lower distribution tube  561 , and a ring-shaped distribution tube top lining  5622  is formed at a periphery of an upper edge of an inner diameter portion of the upper ring  563 . The distribution tube  56 , which is configured as explained, also performs the same function as the distribution tubes shown in  FIG. 4  and  FIG. 9 , and therefore the component to be replaced frequently (e.g. an upper ring) can be manufactured more easily. Meanwhile, when the distribution tube protective layer  564  is formed by the distribution tube  56 , a centrifugal force is exerted on the object to be crushed which is inserted into the center of the rotor  5 , which makes the object to be crushed, which is apart from the center of the rotor by a small distance, rise along an inclined surface to reach the upper end of the distribution tube, and then be further accelerated by the centrifugal force to fly toward the rotor side wall  54 . Therefore, the effects of installing the distribution tube  56  are as follows: First, since the distribution tube protective layer  564  is formed to prevent the wear due to a direct contact between the upper surface of the rotor lower plate  53  and the crushed object, the rotor lower plate can be used permanently without being replaced. Second, since the direction of flight of the crushed object which is accelerated by the centrifugal force can be determined by adjusting an upper end height of the distribution tube  56 , when the upper end of the distribution tube is formed to be slightly lower than a position at a height corresponding to half the height of the rotor side wall  54 , it is possible to control the direction of flight of the object to be crushed, which is inserted into the center of the rotor  5  and accelerated, to substantially point at a predetermined area around the position at a height corresponding to half the height of the rotor side wall. The particles, which escape from the upper end of the distribution tube, come to fly in a direction of the sum vector of a vector of the inclined surface of the distribution tube protective layer  564  and the vector of the centrifugal force direction exerted on the particles. 
     Next, the circular hole and a relevant configuration formed at the rotor side wall will be explained by referring to  FIGS. 5-8 . Four circular holes  541  are radially formed equidistantly on the rotor side wall  54  around the rotation center of the rotor. A wear-resistant tip ring housing support ring  542  having tap holes  5421  is firmly engaged with the circumference of the circular hole  541  in one entity by way of welding, etc. A plurality of tap holes  5421  of the wear-resistant tip ring housing support ring  542  are formed equidistantly along the circumference of the circular hole  541 . That is, for example, four or six tap holes are formed (six tap holes are shown in the figures). A ring-shaped wear-resistant tip ring housing  543  is engaged with an outer surface of the wear-resistant tip ring housing support ring  542 . And, since the wear-resistant tip ring housing  543  also has bolt holes  5431  at positions corresponding to the tap holes  5421  of the wear-resistant tip ring housing support ring  542 , they can be engaged with each other by means of coupling bolts  545 . Also, the number of the bolt holes  5431  formed in the wear-resistant tip ring housing  543  can be equal to the number of the tap holes  5421 , or double the number of the tap holes  5421 . For example, when the number of the tap holes  5421  is four and the number of bolt holes  5431  is also four, the wear-resistant tip ring housing  543  can be engaged with the wear-resistant tip ring housing support ring  542  at four angles; however, it can be understood that when the number of the tap holes  5421  is four and the number of bolt holes  5431  is twelve, the wear-resistant tip ring housing  543  can be engaged with the wear-resistant tip ring housing support ring  542  at twelve angles. 
     A wear-resistant tip ring  546 , which is made of a wear-resistant material such as an extra hard alloy, etc., is housed at an inner edge portion of the inner diameter portion of the wear-resistant tip ring housing support ring  542 . Therefore, when seen from an inner portion of the rotor to outside through the circular hole  541 , the wear-resistant tip ring  546  can be positioned on an inner periphery of the circular hole  541 , where the particles, which are accelerated to be discharged to outside through the circular hole  541 , collide, and it is thus possible to protect a portion that can be worn in the rotor. 
     Also, since the crushed object, which is accelerated to be discharged to outside by the centrifugal force, escapes from a 3 o&#39;clock portion or a 9 o&#39;clock portion according to the rotating direction of the rotor, the portions of the wear-resistant tip ring  546  which are located at the corresponding portions come to experience intensive wearing. More specifically, a funnel-shaped protective layer is formed on an inner surface of the circular hole  541  around the circular hole in an inner space of the rotor by the centrifugal force. Then, the funnel-shaped protective layer formed as above can be formed as a valley at a center height portion of the circular hole  541  according to the shape (a half height portion of the circle is the farthest portion from the rotation center of the rotor) of a circle of the circular hole  541  and the centrifugal force, and, therefore, the valley portion comes to be located at a farther position from the rotation center of the rotor. As a result, the crushed object, which escapes from the distribution tube  56  and reaches the rotor protective layer  57 , is moved toward the valley portion, and then the centrifugal force is exerted again on the crushed object to move the crushed object toward the circular hole, which results in the crushed object escaping from the 3 o&#39;clock direction portion or a 9 o&#39;clock direction portion of the circular hole  541 . According to this configuration, irrespective of the position where the crushed object first reaches the rotor protective layer, the crushed object is moved by the centrifugal force to pass through the valley portion to be guided into the a 3 o&#39;clock or the 9 o&#39;clock direction position of the circular hole, and then leaves the rotor while touching the wear-resistant tip ring made of an extra hard alloy. Therefore, the positions and the degrees of wearing on the wear-resistant tip ring are accurately same for all apertures, which prevent vibrations from being generated in the rotor which is rotating at a high speed. 
     For example, when the rotor  5  rotates in the rotating direction as shown in  FIG. 6 , the 9 o&#39;clock direction portion shown in the figure among the perimeter portions of the wear-resistant tip ring  546  will be intensively worn. When the wearing progresses and the wear-resistant tip ring portion is worn to a limiting point, the coupling bolts  545  are released, the wear-resistant tip ring housing  543  is rotated by one spacing between the bolt holes  5431 , and then the coupling bolts are engaged again. Then, the portion of the wear-resistant tip ring  546 , which is not worn, is positioned on the 3 o&#39;clock direction portion or the 9 o&#39;clock direction portion, which results in a uniform wearing of the wear-resistant tip ring as well as a greatly elongated lifespan of the wear-resistant tip ring. This configuration can be realized by the fact that the holes are circular holes  541  and particles are intensively accelerated to move along a predetermined position (a 3 o&#39;clock or a 9 o&#39;clock direction) and that the wear-resistant tip ring housing, which is coupled with the circular hole, is also circular which makes it possible to engage the wear-resistant tip ring housing  543  with the circular hole  541  while rotating the wear-resistant tip ring housing. 
     As explained in the above, the rotor protective layer  57  is formed in an inner portion of the rotor  5  which is surrounded by the rotor side wall  54  and the rotor upper plate  55  and the rotor lower plate  53  adjacent to the rotor side wall as shown in  FIG. 4  and  FIG. 5 , and the rotor protective layer is formed by the crushed object which is inserted into the rotor  5  and accumulated by the centrifugal force. When the rotor protective layer  57  of a predetermined shape is formed, the particles, which fly from the center of the rotor  5  toward the rotor side wall  54  by the centrifugal force, do not collide directly with the rotor side wall, the rotor upper plate, and the rotor lower plate, and they rather come to collide with the rotor protective layer  57 , which prevents the side wall, the upper plate, or the lower plate from being worn due to the collision with the particles. Since the rotor protective layer  57  is formed in a shape similar to the funnel shape centered at the circular hole  541 , rather than the wave-patterned protective layer formed on the conventional rotor, the rotor protective layer can cover not only the rotor side wall  54  but also the rotor upper plate  55  and the rotor lower plate  53 , which are connected with the rotor side wall at upper and lower portions, respectively. Therefore, the bottom and the ceiling of the rotor as well as the rotor side wall can be completely protected by the rotor protective layer. 
     According to the present invention, a washer-shaped partition ring  544  is sandwiched between the wear-resistant tip ring housing  543  and the wear-resistant tip ring housing support ring  542  and an inner diameter of the partition ring  544  is smaller than the an inner diameter of the wear-resistant tip ring housing support ring  542  and substantially equal to the inner diameter of the wear-resistant tip ring housing  543  as shown in  FIG. 5 , such that the rotor protective layer  57 , which is made of the crushed object, is formed not on the inner surface of the wear-resistant tip ring housing  543  but on the inner surface of the partition ring  544 . Since the crushed object which constitutes the rotor protective layer  57  has tiny particles and contains much moisture, it can form an extremely strong protective layer when consolidated by the strong centrifugal force generated in the rotor  5 , and since the object to be crushed also has an adhesive property, when the rotor protective layer is consolidated, the protective layer is attached to the constituents touching the rotor protective layer  57  with an extremely strong adhesive force. As explained above, the 3 o&#39;clock direction portion or the 9 o&#39;clock direction portion of the wear-resistant tip ring  546  experiences severe wearing, and the wear-resistant tip ring housing  543  should be disassembled in order to rotate the wear-resistant tip ring housing  543  by a predetermined angle and then reinstall the wear-resistant tip ring housing, it would be very hard to separate the wear-resistant tip ring housing  543  from the rotor protective layer  57  when the wear-resistant tip ring housing  543  adjoins the rotor protective layer  57  having a strong adhesive force. In consideration of this situation, the present invention disposes the partition ring  544  between the wear-resistant tip ring housing  543  and the rotor protective layer  57 . Since the partition ring  544  prevents the rotor protective layer  57  from directly adjoining the wear-resistant tip ring housing  543  according to the present invention, the worn wear-resistant tip ring  546  can be easily separated when the wear-resistant tip ring is to be rotated or separated. Also, even when the wear-resistant tip ring housing  543  is to be disassembled, since the partition ring  544  supports the rotor protective layer  57  while being attached to the rotor protective layer  57 , a dynamic balance of the rotor  5  can be maintained after the wear-resistant tip ring housing  543  is disassembled and then assembled again by preventing the rotor protective layer  57  from being damaged while the wear-resistant tip ring housing  543  is separated. In addition, since the inner diameter of the partition ring  544  coincides with the inner diameter of the wear-resistant tip ring housing  543 , the partition ring  544  at a corresponding portion still supports the rotor protective layer  57  while maintaining its shape even when a wearing portion of the wear-resistant tip ring  546  is located in other directions than the 3 o&#39;clock or 9 o&#39;clock direction after the wear-resistant tip ring housing  543  is disassembled and assembled again, which further prevents the balance of the rotor protective layer  57  from being badly affected even after the wear-resistant tip ring housing  543  is disassembled and assembled again. In the meantime, although the 3 o&#39;clock or 9 o&#39;clock direction on the partition ring  544  can experience wearing while the rotor rotates, a portion of the wear-resistant tip ring  546 , which is not worn, can be disposed at the worn direction by disassembling, rotating, and assembling the wear-resistant tip ring  546  again, which applies little effect on the balance of the rotor protective layer  57 . However, the partition ring  544  can also be replaced when necessary, and, therefore, the partition ring  544  according to the present invention is provided as a separate structure apart from the wear-resistant tip housing support ring  542 . Also, when the outer diameter of the partition ring  544  is configured to be substantially equal to an inner diameter of the stepped portion formed on the wear-resistant tip ring housing support ring  542  as shown in  FIG. 5 , the installation position of the partition ring can be set easily. 
     The aforementioned wear-resistant tip ring  546  is configured to protect a rim portion of the hole  541  in an operation environment causing the severe wearing. In other words, it can be understood that the wear-resistant tip ring should not necessarily be made of an extra hard alloy material and may not be installed at all in an operation environment causing less wearing, such as when the object to be crushed is relatively large and a frictional area between the rotor and the object to be crushed, which is the cause of wearing, is small. However, even in the case of causing less wearing, it will be much easier to reinforce a worn portion or take other measures when compared to the conventional rotor, since a trajectory along with the object to be crushed travels in the rotor can be accurately controlled attributed to the shape of the circular hole. Therefore, in addition to the efficient use of the wear-resistant tip ring, the circular hole is technically important on its own. Meanwhile, since a mass of the rotor protective layer  57 , which is formed in an inner space of the rotor  5 , is decreased by installing a partition  58  between the rotor protective layer  57  and the rotor side wall  54  as shown in  FIG. 5 , the power required for rotating the rotor  5  can be reduced (to the contrary, when no partition is provided, a vacant space, which is surrounded by the partition, will be filled with the crushed object and the mass of the protective layer will be increased). 
     It is also possible to further develop this technical feature such that the rotor upper plate  55 , the rotor lower plate  53 , and the rotor side wall  54  are configured as shown in  FIG. 11 . That is, although the rotor  5  shown in  FIG. 5  and  FIG. 6  has the rotor upper plate  55 , the rotor lower plate  53  having circular shapes, the rotor side wall  54  having a cylinder shape, and a separate partition  58  within the rotor side wall  54 , it is possible to configure the rotor upper plate (not shown in the figure) and the rotor lower plate  53  in a regular quadrilateral shape, arrange the circular holes  541  at vertex portions of the regular quadrilateral shape, and form the rotor side wall  54  in the shape of the partition  58  as shown in  FIG. 11 , such that the housing of the rotor can be formed in a simple and lightweight configuration. 
     In the following, operations of the aforementioned rotor and the vertical shaft impact crusher are explained. 
     The object to be crushed, which is inserted into the hopper  22 , passes by the injection chute  23  and is inserted into the rotor  5  at a constant supply speed. 
     The object to be crushed, which is inserted into the inner portion of the rotor through a center portion of the upper plate  55  of the rotating rotor  5 , is forced away from the center by the centrifugal force to collide with the distribution tube protective layer  564  formed inside the distribution tube  56  and then rise along the inclined surface of the distribution tube protective layer  564  to be accelerated. After escaping the upper end of the distribution tube  56 , the object to be crushed collides with the rotor protective layer  57  and is abruptly accelerated to move along the surface of the rotor protective layer  57  toward the 3 o&#39;clock or 9 o&#39;clock direction (whether the object is accelerated to the 3 o&#39;clock or 9 o&#39;clock direction is determined according to a rotating direction of the rotor) of the circular hole  541 , and then, finally, the object to be crushed comes to escape from the rotor  5  at a high speed (a linear velocity is the highest at the end of the rotor). 
     The particles, which have escaped from the rotor assembly  2 , fly with a velocity vector having a direction tangential to the outer diameter of the rotor to forcefully collide with the stoppage protective layer  112 , which is formed on the upper frame  11  and the stepwise portion  111 , and then are crushed. 
     The crushed object falls down in a gravitational force direction along the inclined surface of the stoppage protective layer  112  to reach the lower frame  12 , and it is guided to outside by the chute, etc. 
     With respect to a moving path of the crushed object, the object to be crushed inserted into the center portion of the rotor  5  moves to outside while adjoining the distribution tube protective layer  564 , collides with the rotor protective layer  57  at a position controlled by the height of the distribution tube  56 , and is accelerated. Then, the object to be crushed moves along the rotor protective layer  57  to fly outside and then collides with the stoppage protective layer  112  again to be crushed. Therefore, only a portion of the distribution tube bottom lining  5615 , a portion of the distribution tube top lining  5622 , and the 3 o&#39;clock or 9 o&#39;clock direction of the wear-resistant tip ring  546  directly touch the object to be crushed which is inserted into the rotor  5  in the configuration of the crusher. 
     According to the present invention, the moving path of the object to be crushed is accurately controlled as intended by using the configuration of the rotor to minimize the portion where the object to be crushed directly touches the inner configuration of the rotor, which extends a lifespan of the rotor by a great amount and facilitates the maintenance of the rotor. Also, it is apparent that no stabilization process is required after the maintenance process since the protective layer remains after the maintenance. In addition, other effects which are not described herein can be envisaged based on the apparent effects of the configuration of the present invention. 
     Although the present invention has been explained by referring to the appended figures as in the above, it is to be noted that the present invention is not restricted to the embodiments and figures disclosed with this specification, and that various modifications can be made by the person having an ordinary skill in the art within the scope of the technical spirit of the present invention. For example, when an equilateral polygon hole  59  (such as the regular hexagon hole as shown in  FIG. 10 ) is formed instead of the aforementioned circular hole  541 , a configuration having a rotor side wall  54  part, which is disposed at an area between the equilateral polygon hole  59  and the rotor lower plate  53  and the rotor upper plate  55  (refer to the shaded portion in  FIG. 10 ) seen in an up-down direction of the polygon hole  59 , can also be considered. In this case, in a similar manner, since a funnel-shaped rotor protective layer  57  is formed around the equilateral polygon hole  59  and a valley is formed around a portion of the rotor protective layer  57  with a height corresponding to half the height of the rotor side wall, the object to be crushed is made to escape from the 3 o&#39;clock direction portion or the 9 o&#39;clock direction portion of the equilateral polygon hole  59 , which provides the effect similar to the effect of the case having the circular hole  541 . Therefore, even the hole with an equilateral polygon shape rather than a circular shape can be considered to be equivalent to the circular hole since the effects are similar as well as the valley is formed around a portion with a height corresponding to half the height of the rotor side wall and the object to be crushed escapes to outside from the 3 o&#39;clock direction portion or the 9 o&#39;clock direction portion of the hole  59 . In addition, although there is shown a vertical shaft impact crusher having a stoppage protective layer made of the object to be crushed, it is apparent that a vertical shaft impact crusher having a plurality of anvils as used in the field instead of the stoppage protective layer which are arranged in a circular shape also falls into the embodiments of the present invention. And, it is apparent that, although the effects according to the configuration of the present invention are not clearly written and described while explaining the embodiments of the present invention, any effect, which can be predicted by the corresponding configuration, can also be anticipated. 
     INDUSTRIAL APPLICABILITY 
     It is apparent that the aforementioned rotor and the vertical shaft impact crusher using the same are industrially applicable to the crushing field.