Abstract:
Disclosed is a juice extractor, comprising: a base ( 100 ); a drive mechanism ( 200 ) installed in the base ( 100 ); and a juice extracting component ( 300 ) supported by and fixed on the base ( 100 ); wherein, the juice extracting component ( 300 ) comprises: a shell ( 700 ) having an opening part ( 710 ) on its top, a juice outlet ( 715 ), and a residue outlet ( 720 ); a first grinding plate ( 500 ) rotatably installed in the shell ( 700 ), the first grinding plate ( 500 ) includes a first body part ( 510 ) and a connecting part to connect to the drive mechanism, and the first body part ( 510 ) has a first grinding face ( 511 ) with first grinding teeth ( 513 ) arranged thereon; a second grinding plate ( 400 ) fixed in the shell ( 700 ), the second grinding plate ( 400 ) includes a second body part ( 410 ) with a second grinding face ( 411 ) opposite to the first grinding face ( 511 ).

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation application of PCT Patent Application No. PCT/CN2013/083879, entitled “Juice Extractor”, filed on Sep. 22, 2013, which claims priority to Chinese Patent Application No. 201310250476.6 entitled “Juice Extractor”, filed on Jun. 21, 2013, the entire contents of which are incorporated herein by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The present disclosure relates to kitchenware, more particularly, to a juice extractor for extracting juice from vegetables, fruits or extracting soy milk from beans. 
       BACKGROUND 
       [0003]    In the prior arts, there are mainly two different manners for extracting juice with a juice extractor: 
         [0004]    One manner is to extract juice through high speed cutting, centrifuging and spin drying. Wherein, vegetables and/or fruits to be extracted are smashed with a smashing device, and then are rotated at a high speed to spin off juice by centrifugal force. This manner has disadvantages as follows: significant noises and vibrations are generated during the high-speed revolution of the juice extractor, causing much noise in the operating environment; moreover, the inherent flavor and nutrition of foods are seriously damaged in the process of the high-speed revolution. 
         [0005]    The other manner is to extract juice through screw extrusion. Wherein, vegetables and/or fruits to be extracted are extruded by a screw structure, so as to separate juice from the residues. This manner has solved the noise problem, and has avoided the loss of the inherent flavor and nutrition of foods, but following disadvantages still exist: Firstly, the foods are smashed and ground mainly by means of the twisting force generated between the screw and the inner wall of the shell, therefore, a large torque is required, and a motor with greater twisting force is needed, which increases the manufacturing cost of the juice extractor; moreover, too much twisting force concentrates on sides of the shell, as a result, the shell easily cracks after a long period of use, and the lifetime of the juice extractor is shortened. Secondly, to ensure a sufficient grinding, the head of the juice extractor cannot be short in length, thus the height of the shell is too high, as a result, the manufacturing cost of the juice extractor is increased, and the machine is not convenient for the user to operate. Finally, it is difficult to cut off fibers in foods in this manner, when handling high fiber foods, the filter screen is easily blocked and the juice extraction speed is not fast enough. 
       SUMMARY 
       [0006]    In view of defects existing in the prior art mentioned above, the objective of the present disclosure is to provide a juice extractor, which has lower manufacturing cost, longer lifetime and higher juice extraction speed, in addition, the filter holes of its filter component are not blocked easily. 
         [0007]    In order to solve the technical problem above, the present disclosure provides a juice extractor, comprising: 
         [0008]    a base; 
         [0009]    a drive mechanism installed in the base; 
         [0010]    a juice extracting component, which is supported by and fixed on the base; 
         [0011]    wherein, the juice extracting component comprises: 
         [0012]    a shell having an opening part on its top, a juice outlet for discharging juice extracted from vegetables and/or fruits, and a residue outlet for discharging extracted residues; 
         [0013]    a first grinding plate rotatably installed in the shell, the first grinding plate includes a first body part, and a connecting part to connect to the drive mechanism, and the first body part has a first grinding face with first grinding teeth arranged on the first grinding face; 
         [0014]    a second grinding plate installed in the shell, the second grinding plate includes a second body part with a second grinding face opposite to the first grinding face, and second grinding teeth and a feed inlet for feeding foods are disposed on the second grinding face, the second grinding teeth match with the first grinding teeth to grind foods; and 
         [0015]    a filter component to separate vegetable and/or fruit juice from the extracted residues. 
         [0016]    In one of the embodiments, at least one first grinding and discharge convex rib, which extends from a central section of said first grinding face to an outer peripheral surface of the first body part, is disposed on said first grinding face, and height of top surface of said first grinding and discharge convex rib is equal to or greater than maximum height of top surface of said first grinding teeth. 
         [0017]    In one of the embodiments, said first grinding and discharge convex rib is arc-shaped, and a bending direction of said first grinding and discharge convex rib is consistent with a rotation direction of said first grinding plate in operation. 
         [0018]    In one of the embodiments, two or more said first grinding and discharge convex ribs are disposed on said first grinding face, all of said first grinding and discharge convex ribs extend from the central section of the first grinding face and are spaced from one another along a circumferential direction, dividing the first grinding face into multiple grinding sections, with first grinding teeth distributed within each grinding section. 
         [0019]    In one of the embodiments, along a rotation direction of said first grinding plate in operation, the maximum height of top surface of said first grinding teeth in each grinding section is increased gradually. 
         [0020]    In one of the embodiments, all of the top surfaces of said first grinding teeth in each grinding section form a first gradual changing surface, height of said first gradual changing surface is decreased from the central section to an edge of said first grinding face, and level of an intersecting line of the first gradual changing surface and the outer peripheral surface of the first body part is gradually decreased along a rotation direction of said first grinding plate in operation. 
         [0021]    In one of the embodiments, said first grinding teeth, which extend from said first grinding and discharge convex rib to the outer peripheral surface of first body part, are arc-shaped, and a bending direction of said first grinding teeth is consistent with a rotation direction of said first grinding plate in operation, a first drain groove for discharging juice is formed between every two adjacent first grinding teeth. 
         [0022]    In one of the embodiments, at least one outward protruding first grinding rib is disposed on the outer peripheral surface of the first body part. 
         [0023]    In one of the embodiments, at least one second grinding and discharge convex rib, which extends from a central section of said second grinding face to an outer peripheral surface of the second body part, is disposed on said second grinding face, and height of top surface of said second grinding and discharge convex rib is equal to or greater than maximum height of top surface of said second grinding teeth. 
         [0024]    In one of the embodiments, said second grinding and discharge convex rib and said second grinding teeth are arc-shaped, and bending directions of said second grinding and discharge convex rib and said second grinding teeth are opposite to a rotation direction of said first grinding plate in operation. 
         [0025]    In one of the embodiments, all of the top surfaces of said second grinding teeth form a second gradual changing surface, height of said second gradual changing surface is increased gradually from said feed inlet to an edge of said second grinding face. 
         [0026]    In one of the embodiments, a positioning column is provided on a central section of said first grinding face, and a positioning hole engageable with said positioning column is provided on a central section of said second grinding face. 
         [0027]    In one of embodiments, said second grinding plate is positioned above said first grinding plate. 
         [0028]    In one of embodiments, said second grinding plate is removably installed in said opening part of said shell, said second grinding plate further includes a tubular-shaped food channel disposed on top surface of the second body part, said food channel communicates with said feed inlet. 
         [0029]    In one of the embodiments, said juice extractor further comprising a lid, said lid is removably installed in the opening part of said shell, said second grinding plate is installed on said lid, and an elastic element is disposed between said second grinding plate and said lid, a tubular-shaped food channel is disposed on top surface of said lid, and said food channel communicates with said feed inlet. 
         [0030]    In one of the embodiments, said filter component is positioned below the first body part, said filter component includes a hollow cylindrical filter cavity, multiple filter holes are disposed on a wall of said filter cavity. 
         [0031]    In one of the embodiments, said filter component further includes an outward protruding second grinding rib disposed on an outer surface of said filter cavity, a third grinding rib is disposed on an inner surface of said shell, and said second grinding rib matches with said third grinding rib to grind foods. 
         [0032]    In one of the embodiments, a stepped mounting part for installing said filter component is provided on a bottom of first body part, multiple first limitation grooves are disposed on surface of said mounting part, multiple first limitation protrusions engageable with said multiple first limitation grooves are disposed on an inner wall of a top of said filer cavity, said filter component is installed on said first grinding plate by rotating said first limitation protrusions into said limitation grooves. 
         [0033]    In one of the embodiments, said filter component further includes one or more residue pushing blocks disposed on a bottom of said filter cavity, an annular-shaped residue discharge passage is disposed on the bottom of said shell, top surface of said residue discharge passage is inclined surface, said residue outlet is formed at an end of the top surface of the residue discharge passage, and a plurality of fourth grinding ribs are arranged on said residue discharge passage and spaced from one another, said fourth grinding ribs match with said residue pushing blocks to grind foods. 
         [0034]    The juice extractor of the present disclosure extracts juice by means of the relative rotation between the first grinding plate and the second grinding plate, as compared with the prior art, the present disclosure has the following advantages:
       1. The shell of the present juice extractor bears less twisting force, and the shell will not crack easily, thus the lifetime of the present juice extractor is prolonged.   2. The grinding plate of the present juice extractor needs less torque, therefore, a motor with less torque output can be used, the manufacturing cost of the juice extractor is reduced, and the electric power consumption can be reduced.   3. The foods can be smashed and ground by means of the first grinding plate and the second grinding plate of the present juice extractor, and the fibers of foods can be cut off easily, thus the problem that the filter holes of the filter component are easily blocked by high fiber foods can be solved, and the juice extraction speed is increased.   4. The height of the present juice extractor is significantly lowered, as a result, the size of the product is reduced, the manufacturing cost and the transportation cost are saved, and the machine is convenient for users to operate.       
 
         [0039]    In summary, the present juice extractor has following advantages: lower cost, longer lifetime, higher juice extraction speed, and the filter holes of the filter component are not easily blocked. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0040]      FIG. 1  is a section view illustrating the structure of the juice extractor according to one embodiment of the present invention; 
           [0041]      FIG. 2  is an exploded view of the juice extractor shown in  FIG. 1 ; 
           [0042]      FIG. 3  is a schematic perspective view illustrating the structure of the first grinding plate of the juice extractor shown in  FIG. 1 ; 
           [0043]      FIG. 4  is a schematic perspective view illustrating the structure of the second grinding plate of the juice extractor shown in  FIG. 1 ; 
           [0044]      FIG. 5  is a schematic perspective view illustrating the structure of the filter component of the juice extractor shown in  FIG. 1 ; 
           [0045]      FIG. 6  is a cross-section view illustrating the relationship between filter component and shell of said juice extractor in  FIG. 1 ; 
           [0046]      FIG. 7  is a schematic view illustrating the structure of the second grinding plate of the juice extractor according to another embodiment of the present invention. 
       
    
    
       [0047]    The elements in the figures are denoted as follows:  100 , base;  105 , top surface;  110 , bearing area;  115 , clip;  200 , drive mechanism;  210 , output shaft;  300 , juice extracting component;  400 , second grinding plate;  410 , second body part;  411 , second grinding face;  412 , second grinding and discharge convex rib;  413 , second grinding tooth;  414 , second drain groove;  415 , positioning hole;  416 , outer peripheral surface of the second body part;  417 , feed inlet;  418 , rib;  419 , second limitation groove;  420 , food channel;  500 , first grinding plate;  510 , first body part;  511 , first grinding face;  512 , first grinding and discharge convex rib;  512   a,  top surface of the first grinding and discharge convex rib;  513 , first grinding tooth;  513   a,  top surface of the first grinding tooth;  514  first drain groove;  515 , positioning column;  516 , outer peripheral surface of the first body part;  517 , first grinding rib;  518 , cylinder;  520 , connecting part;  530 , mounting part of the filter component;  535 , first limitation groove;  600 , filter component;  610 , filter cavity;  615 , filter hole;  620 , first limitation protrusion;  630 , second grinding rib;  640 , residue pushing block;  650 , juice pushing block;  660 , residue stopping rib;  670 , juice stopping rib;  700 , shell;  710 , opening part;  715 , juice outlet;  720 , residue outlet;  725 , guide rib;  730 , third grinding rib;  735 , through-hole;  740 , second limitation protrusion;  745 , residue stopping groove;  755 , residue discharge passage;  760 , fourth grinding rib;  765 , baffle wall;  770 , waterproof cylindrical structure;  775 , juice discharge passage;  800 , elastic element;  900 , lid;  905 , rib;  910 , third limitation groove;  915 , food channel. 
       DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0048]    The present disclosure will be described in more details with reference to the accompanying figures and embodiments. It should be noted that various embodiments and the features thereof can be combined with each other under the condition of no conflict. 
         [0049]      FIG. 1  and  FIG. 2  illustrate the structure of the juice extractor according to one embodiment of the present invention, the juice extractor includes a base  100 , a drive mechanism  200  and a juice extracting component  300 , wherein, the base  100  has a top surface  105 , the top surface  105  includes a bearing area  110  for installing the juice extracting component  300 , and three clips  115  are arranged on the bearing area  110  along the circumferential direction. The drive mechanism  200  is installed inside the base  100 , the output shaft  210  of the drive mechanism  200  protrudes out of a through-hole disposed in the central part of the bearing area  110 . 
         [0050]    With continuing reference to  FIG. 1  and  FIG. 2 , the juice extracting component  300  mainly includes a shell  700 , a first grinding plate  500  rotatably installed in the shell  700 , a second grinding plate  400  which is opposite to the first grinding plate  500  and installed in the shell  700 , and a filter component  600 . Wherein, the shell  700  has an opening part  710  on its top; multiple second limitation protrusions  740  are disposed on the inner surface of the opening part  710 , recesses (not shown) engageable with the clips  115  on the base  100  are arranged on the bottom of the shell  700 , so that the shell  700  is detachably installed on the bearing area  110  by means of the recesses and the clips  115 . Multiple guide ribs  725  and multiple third grinding ribs  730  are arranged alternately at intervals on the inner surface of the shell  700  along the axial direction of the shell  700 , preferably, the multiple third grinding ribs  730  are not same in length. 
         [0051]    As shown in  FIG. 3 , the first grinding plate  500  includes a first body part  510  and a connecting part  520  for connecting to the output shaft  210  of the drive mechanism  200 , a polygonal hole (not shown) engageable with the output shaft  210  is disposed on the connecting part  520 , the connecting part  520  of the first grinding plate  500  is removably installed on the output shaft  210 , so that it is convenient for washing. The first body part  510  includes a first grinding face  511 , a cylinder  518  disposed in the central section of the first grinding face  511 , at least one first grinding and discharge convex rib  512  that extends from the outer peripheral surface of the cylinder  518  to the outer peripheral surface of the first body part  510 , and several first grinding teeth  513 . A positioning column  515  extending outward along the axial direction of the cylinder  518  is disposed on the top surface of the cylinder  518 , the positioning column  515  is engageable with the positioning hole  415  on the central section of the second grinding plate so as to perform the positioning function. The first grinding and discharge convex rib  512  is used for grinding and discharging, and the height of the top surface  512   a  of the first grinding and discharge convex rib  512  is equal to or greater than the maximum height of the top surface  513   a  of the first grinding teeth  513 . Preferably, the first grinding and discharge convex rib  512  is arc-shaped, and the bending direction of the first grinding and discharge convex rib  512  is consistent with the rotation direction (the direction denoted by the arrow next to the first grinding plate in  FIG. 2 ) of the first grinding plate  500  in operation. The first grinding teeth  513  are mainly used for grinding. Preferably, two or more first grinding and discharge convex ribs  512  are disposed on the first grinding face, all of these first grinding and discharge convex ribs  512  extend from the central section of the first grinding face  511  and are spaced from one another along the circumferential direction, dividing the first grinding face  511  into multiple grinding sections, with first grinding teeth  513  distributed within each grinding section. Preferably, the maximum height of the top surface  513   a  of the first grinding teeth  513  in each grinding section is increased gradually along the rotation direction of said first grinding plate  500  in operation, thereby segmented grindings can be realized, which is beneficial to improve the juice extraction speed, and the blockage of the machine caused by larger size of foods can be avoided. Furthermore, all of the top surfaces  513   a  of the first grinding teeth  513  in each grinding section form a first gradual changing surface, the height of the first gradual changing surface is decreased from the central section to the edge of the first grinding face  511 , and the level of the intersecting line of the first gradual changing surface and the outer peripheral surface  516  of the first body part  510  is gradually decreased along the rotation direction of the first grinding plate  500  in operation, the first gradual changing surface can be used for unloading the stuffs, so as to avoid the build-up of the extracted residues. Preferably, the first grinding teeth  513 , which extend from the first grinding and discharge convex rib  512  to the outer peripheral surface  516  of the first body part  510 , is arc-shaped, and the bending direction of the first grinding teeth  513  are consistent with the rotation direction of the first grinding plate  500  in operation; a first drain groove  514  for discharging juice is formed between every two adjacent first grinding teeth  513 , which is convenient for draining ground juice. Wherein, the first grinding and discharge convex ribs  512  and the first grinding teeth  513  on the first grinding plate  500  match with the second grinding and discharge convex ribs  412  and the second grinding teeth  413  on the second grinding plate  400 , forming a first grinding region A (as shown in  FIG. 1 ), the first grinding region A is mainly used for a primary food grinding and for cutting-off foods, so as to increase the juice yield, and to avoid blocking of the filter holes  615  of the filter component  600  caused by high fiber foods that have not been cut off. 
         [0052]    With further reference to  FIG. 3 , at least one outward protruding first grinding rib  517  is disposed on the outer peripheral surface of the first body part  510 , the first grinding rib  517  matches with the guide ribs  725  on the inner wall of the shell  700 , forming a second grinding region B (see  FIG. 1 ), the second grinding region B is used for a secondary food grinding, so as to increase the juice yield. 
         [0053]    With further reference to  FIG. 3 , a stepped mounting part  530  for installing the filter component  600  is provided on the bottom of the first body part  510 , multiple first limitation grooves  535  are disposed on the surface of the mounting part  530 . 
         [0054]    As shown in  FIG. 4 , the second grinding plate  400  includes a second body part  410  and a food channel  420  for feeding foods, the second body part  410  has a second grinding face  411 ; a positioning hole  415  is disposed in the central section of the second grinding face  411 , in addition, a feed inlet  417  eccentrically positioned relative to the positioning hole  415 , a second grinding and discharge convex rib  412  extending from the wall of the positioning hole  415  to the outer peripheral surface  416  of the second body part  410 , and second grinding teeth  413  are disposed on the second grinding face  411 . The positioning hole  415  is engaged with the positioning column  515  on the first grinding plate  500 , the feed inlet  417  communicates with the food channel  420 , for feeding foods. The second grinding and discharge convex rib  412  is used for grinding and discharging, and the height of the top surface of the second grinding and discharge convex rib  412  is equal to or greater than the maximum height of the top surface of the second grinding teeth  413 . Preferably, the second grinding teeth  413  are arc-shaped, and the bending direction of the second grinding teeth  413  are opposite to the rotation direction of the first grinding plate  500  in operation, thus, the first grinding teeth  513  and second grinding teeth  413  are arranged in an interleaved manner, so as to avoid blocking stuffs. Preferably, all of the top surfaces of the second grinding teeth  413  form a second gradual changing surface, the height of the second gradual changing surface is increased gradually from the feed inlet  417  to the edge of the second grinding face  411 , as a result, the distance between the first grinding face  511  and second grinding face  411  is decreased gradually from the feed inlet  417 , foods are crushed firstly, and then ground, so as to avoid the blockage of the machine caused by larger size of foods. Preferably, the second grinding teeth  413  extend from the second grinding and discharge convex rib  412  to the outer peripheral surface of the second body part  410 , and a second drain groove  414  for discharging juice is formed between every two adjacent second grinding teeth. 
         [0055]    With further reference to  FIG. 4 , a plurality of outward protruding ribs  418  are disposed on the outer peripheral surface  416  of the second body part  410 , second limitation grooves  419  are formed by cutting off materials from the outward protruding ribs  418  toward the center point of the second body part, and multiple inward second limitation protrusions  740  engageable with the second limitation grooves  419  are formed on the inner surface of the opening part  710  of the shell  700 , so that the second grinding plate  400  is removably installed in the opening part  710  of the shell  700  by means of the second limitation protrusions  740  and the second limitation grooves  419 . It can be seen that, the second grinding plate  400  is not only used for grinding, but also used as a lid. 
         [0056]    The first grinding plate  500  and the second grinding plate  400  are made of food-grade plastic materials or ceramic materials or powder metallurgy materials, or any combination thereof. 
         [0057]      FIG. 7  is a schematic view illustrating the structure of the second grinding plate of the juice extractor according to another embodiment of the present invention, wherein, the second grinding plate  400  and the lid  900  are independent, the second grinding plate  400  also has a second grinding face and second grinding teeth, a plurality of outward protruding ribs  905  are formed on the outer peripheral surface of the lid  900 , third limitation grooves  910  are formed by cutting off materials from the outward protruding ribs  905  toward the center point of the lid, the third limitation grooves  910  are engaged with the second limitation protrusions  740  on the inner surface of the opening part  710  of the shell  700 , so that the lid is removably installed in the opening part  710  of the shell  700  by means of the second limitation protrusions  740  and the third limitation grooves  910 . The second grinding plate  400  is installed in the lid  900 , and an elastic element  800  is disposed between the second grinding plate  400  and the top of the lid  900 . In this way, the distance between the second grinding plate  400  and first grinding plate  500  can be fine-turned according to the size of foods, so as to avoid the blockage of the machine caused by larger size of foods. 
         [0058]    The filter component  600  as shown is used to separate the vegetable and/or fruit juice from the extracted residues. In this embodiment as shown in  FIG. 5 , the filter component  600  includes a hollow cylindrical filter cavity  610 , multiple filter holes  615  are disposed on said filter cavity  610 , preferably, the filter holes  615  are gradually reduced in diameter from the top to the bottom of the filter cavity  610 . Preferably, one or more outward and spiral second grinding ribs  630  are disposed on the outer surface of the filter cavity  610 , the second grinding ribs  630  match with the third grinding ribs  730  on the inner wall of the shell  700 , forming a third grinding region C (see  FIG. 1 ), the third grinding region C is used for a tertiary food grinding, so as to increase juice yield. 
         [0059]    With continuing reference to  FIG. 5 , the filter component  600  further includes a plurality of inward first limitation protrusions  620  disposed on the inner surface of the top of the filter cavity  610 , the first limitation protrusions  620  are engageable with the first limitation grooves on the first grinding plate  500 , so that the filter component  600  is removably installed on the first grinding plate  500  by means of the first limitation protrusions  620  and first limitation grooves, so that it is convenient for washing. 
         [0060]    With continuing reference to  FIG. 5 , the filter component  600  further includes a plurality of residue pushing blocks  640  and residue stopping ribs  660  disposed on the bottom of the filter cavity  610 , the residue stopping ribs  660  are annular-shaped and protrude downward. And juice stopping ribs  670  are disposed inside the residue stopping rib  660 , the juice stopping ribs  670  are annular-shaped and protrude downward, and are capable of preventing the residues from mixing with the juice. And a plurality of juice pushing blocks  650  are formed from the inner wall of the juice stopping ribs  670  and protrude downward. With continuing reference to  FIG. 2 , a residue stopping groove  745  and a residue discharge passage  755  are disposed on the bottom of the shell  700 , the residue discharge passage  755  is annular-shaped and located outside the residue stopping groove  745 , the top surface of the residue discharge passage  755  is inclined surface, a residue outlet  720  for discharging residues from the shell  700  is formed at the end of the top surface of the residue discharge passage  755 , and a plurality of fourth grinding ribs  760  are disposed on the top surface of the residue discharge passage  755  and are spaced from one another. A annular cylindrical baffle wall  765  is formed at the inner side of the residue stopping groove  745 , and a waterproof cylindrical structure  770  is formed on the central lower end of the shell  700 , the waterproof cylindrical structure  770  has a through-hole  735 , and the output shaft  210  passes through the through-hole  735 , a torus-shaped juice discharge passage  775  is disposed between the bottom of the waterproof cylindrical structure  770  and the bottom of the baffle wall  765 , inclined discharge juice surface is formed on the surface of the juice discharge passage  775 , a juice outlet  715  for discharging juice from the shell  700  is formed at the end of the inclined discharge juice surface. The fourth grinding ribs  760  on the residue discharge passage  755  of the shell  700  match with the end faces of the residue pushing blocks  640 , forming a fourth grinding region D (see  FIG. 6 ) for a quaternary food grinding, so as to increase the juice yield. 
         [0061]    The working principle and operating method of the juice extractor of the present disclosure are as follows: 
         [0062]    When the user needs to make juice, the user turns on the operation switch of the juice extractor at first, and then puts the prepared foods into the juice extractor through the food channel  420  on the second grinding plate  400 . The first grinding plate  500  and filter component  600  are driven to rotate by the output shaft  210  of the drive mechanism  200 , foods enter the region between first grinding plate  500  and second grinding plate  400  through the food channel  420  and are ground gradually; then the residues of foods enter the region between the first grinding ribs  517  and the guide ribs  725 , and are smashed and ground again and again. And then the residues of foods enter the region between the second grinding ribs  630  and the third grinding ribs  730 , and are smashed and ground again and again; at the same time, juice is separated from the residues by the filter component  600 . Lastly, the residues enter the fourth grinding region D, and are smashed, ground and filtered once again, finally the residues are discharged from the residue outlet  720  by the residue pushing block  640  of the filter component  600 , and juice is discharged from the juice outlet  715  into a pre-placed cup by the juice pushing block  650  of the filter component  600 . Then the user can turn off the power and the juice is made. 
         [0063]    Thus it can be seen, as compared to the prior art, the juice extractor of the embodiments of the present disclosure adopts a completely different way of extracting juice, and the present disclosure has following advantages:
       1. The shell of the present juice extractor bears less twisting force, and the shell will not crack easily, thus the lifetime of the present juice extractor is prolonged.   2. The grinding plate of the present juice extractor needs less torque, therefore, a motor with less torque output can be used, the manufacturing cost of the juice extractor is reduced, and the electric power consumption can be reduced.   3. The foods can be smashed and ground by means of the first grinding plate and the second grinding plate of the present juice extractor, and the fibers of foods can be cut off easily, thus the problem that the filter holes of the filter component are easily blocked by high fiber foods can be solved, and the juice extraction speed is increased.   4. The height of the present juice extractor is significantly lowered, as a result, the size of the product is reduced, the manufacturing cost and the transportation cost are saved, and the machine is convenient for users to operate.   5. The present juice extractor adopts four times of grinding, which significantly increases the juice yield.   6. The components for extracting juice in the present juice extractor are detachable, and are convenient to assemble, disassemble and wash.       
 
         [0070]    In summary, the present juice extractor has following advantages: lower cost, longer lifetime, higher juice extraction speed, higher juice yield and the filter holes of the filter component are not easily blocked. 
         [0071]    What described above are several embodiments of the present invention, and these embodiments are specific and in details, but not intended to limit the scope of the present invention. It will be understood by those skilled in the prior art that various modifications and improvements can be made without departing from the spirit of the present invention. All of these modifications and improvements fall within the scope of the present invention.