Patent Publication Number: US-2020282518-A1

Title: Shot-processing device

Description:
TECHNICAL FIELD 
     The present invention relates to a shot-processing device. 
     BACKGROUND ART 
     A shot-processing device that has a separator or a settling chamber has been known (for example, see Patent Literature 1). In such a device the separator or the settling chamber is provided to the route to circulate the shots to separate the shots that are reusable from other particulate objects. Thus, the device effectively contributes to the reuse of the shots. 
     However, in such device preventing the shots from being taken out of the cabinet or from scattering is not considered. Thus, there is room to improve the device in preventing shots from being taken out of the cabinet and from scattering. 
     By considering the above facts, the present invention was invented to provide a shot-processing device by which they can be effectively reused and prevented from being taken out of the cabinet and from scattering. 
     PRIOR-ART PUBLICATION 
     Patent Literature 
     [Patent Literature 1] 
     
         
         Japanese Patent Laid-open Publication No. 2012-101304 
       
    
     SUMMARY OF INVENTION 
     A shot-processing device of a first aspect of the present invention comprises a cabinet in which multiple chambers are formed. It also comprises a transporter that transports an object to be processed in a set direction for transportation within at least the cabinet. It also comprises a shot-projecting machine that is placed in a chamber for projecting the shots, which is one of the multiple chambers, and that projects the shots onto the object to be processed that has been transported into the chamber for projecting the shots. It also comprises an air-blowing machine that is placed in a chamber for blowing air, which is one of the multiple chambers, that is downstream of the chamber for projecting the shots in the direction for transportation, which machine blows air onto the object to be processed that has been transported into the chamber for blowing air. It also comprises a circulating machine that circulates the shots that have a diameter that makes them reusable among the shots that have been projected by the shot-projecting machine and have dropped on a bottom of the chamber for projecting the shots. It also comprises a dust collector that is connected to the cabinet to suction air therein that contains dust. It also comprises a structure for a flow path that consists of a first flow path that forms a part of a flow path to connect the inside of the cabinet with a suction port of the dust collector and is configured to be a part of a route for circulation of the circulating machine and of a second flow path that connects the chamber for blowing air with the suction port of the dust collector. It also comprises a classifying part that is provided in the structure for the flow path, which includes a part of the first flow path and a part of the second flow path, and that classifies the particulate objects that include the shots as shots that have a diameter that makes them reusable and as the other particulate objects. 
     Incidentally, the first flow path and the second flow path may be separately constructed without having a portion that is used for both the first and second parts of the flow path or may be constructed with a portion that is used for both of them. 
     By the above configuration, the multiple chambers are formed within the cabinet. The transporter transports the object to be processed in the set direction for transportation, at least in the cabinet. In the chamber for projecting the shots that is formed in the cabinet the shot-projecting machine is provided to project the shots onto the object to be processed that has been transported into that chamber. In the cabinet, the chamber for blowing air is formed downstream of the chamber for projecting the shots in the direction for transportation. The air-blowing machine that is provided in the chamber for blowing air blows air onto the object to be processed that has been transported into that chamber. Further, the circulating machine is provided to the shot-processing device of the present invention to circulate to the shot-projecting machine the shots that have been projected by the shot-projecting machine and have dropped on the bottom of the chamber for projecting the shots. 
     The dust collector that is connected to the cabinet suctions air in the cabinet that contains dust. The structure for the flow path that forms a flow path to connect the inside of the cabinet with the suction port of the dust collector includes the first flow path, which is a part of the route for circulation of the circulating machine. The classifying part that is provided in the structure for the flow path includes a part of the first flow path and classifies the particulate objects that include the shots as shots that have a diameter that makes them reusable and as the other particulate objects. Thus, the circulating machine can circulate the shots that have a diameter that makes them reusable to the shot-projecting machine. 
     Further, the structure for the flow path includes the second flow path. It connects the chamber for blowing air with the suction port of the dust collector. The classifying part includes a part of the second flow path. Thus, the particulate objects that have been stirred up from the object to be processed, etc., by the air that is blown by the air-blowing machine in the chamber for blowing air, are suctioned to the second flow path so as to be classified as shots that have a diameter that makes them reusable and as the other particulate objects. Thus, the shots are prevented from being taken out of the cabinet, and are effectively reused. 
     By the shot-processing device of a second aspect of the present invention, in the configuration of the first aspect, the classifying part comprises a first classifier that includes a part of the first flow path and a second classifier that is a separate body from the first classifier and includes a part of the second flow path. The first classifier is located nearer the cabinet than is the second classifier. 
     By the above configuration, the first classifier, which includes a part of the first flow path, is located nearer the cabinet than is the second classifier, which includes a part of the second flow path. Thus, the shots can be circulated with little loss. 
     By the shot-processing device of a third aspect of the present invention, in the configuration of the first or second aspect, the structure for the flow path comprises a third flow path that connects a chamber for taking out an object to be processed with the suction port of the dust collector, wherein the chamber for taking out an object to be processed is one of the multiple chambers in the cabinet that is located at a side for taking out the object to be processed. The classifying part includes a part of the third flow path. 
     Incidentally, the third flow path may not include any part that is used for both the first flow path and the second flow path, but may include a part that is used for either the first flow path or the second flow path. 
     By the above configuration, even when the particulate objects are conveyed to the chamber for taking out an object to be processed without suctioning all the particulate objects in the chamber for blowing air, the particulate objects in the chamber for taking out an object to be processed are suctioned through a flow path that is formed by the third flow path. The suctioned particulate objects are classified into the shots that have a diameter that makes them reusable and the other particulate objects by the classifying part. Thus, the shots are prevented from being taken out of the chamber for taking out an object to be processed and are effectively reused. 
     By the shot-processing device of a fourth aspect of the present invention, in the configuration of the third aspect, which refers to the second aspect, the classifying part that constitutes a part of the third flow path is the second classifier. 
     By the above configuration, since in the third flow path the particulate objects are classified by the second classifier, the configuration is not complicated, and the shots are prevented from being taken out of the chamber for taking out an object to be processed and effectively reused. 
     The shot-processing device of a fifth aspect of the present invention, in the configuration of any of the first to fourth aspects, comprises a jig for holding the object to be processed, on which jig the object to be processed is placed, wherein the jig has supporting parts that support the object to be processed from the lower part and are provided with a gap in the circumferential direction in the plan view of the device. The air-blowing machine has a blowing part in which a direction for blowing is set so that air that is blown therefrom passes between adjacent supporting parts. 
     By the above configuration, the jig for supporting the object to be processed supports that object by means of the supporting parts that are provided with a gap in the circumferential direction in the plan view of the device. The air-blowing machine has a blowing part in which a direction for blowing is set so that air that is blown from it passes between the adjacent supporting parts. Thus, the particulate objects that have adhered to the lower part of the object to be processed are blown off and away by the air that is blown from the blowing part. The particulate objects are suctioned by a flow path that is formed by the second flow path. Thus, the particulate objects that have adhered to the lower part of the object to be processed can be effectively removed. 
     The shot-processing device of a sixth aspect of the present invention, in the configuration of the fifth aspect, comprises a tubular hood that is located outside the object to be processed in the plan view of the device and comprises jigs for the hood that support the hood from the bottom. The jigs are provided with a gap in the circumferential direction in the plan view of the device. In the blowing part the direction for blowing is set so that air that is blown therefrom passes between adjacent jigs for supporting the hood. 
     By the above configuration, since the tubular hood is provided outside the object to be processed in the plan view of the device, the shots can be prevented from hitting the outside of the object to be processed. The jigs for the hood are provided with a gap in the circumferential direction in the plan view of the device to support the hood from the bottom. The direction for blowing of the blowing part is set so that air that is blown from it passes between the adjacent jigs for supporting the hood. Thus, even when the hood is provided outside of the object to be processed, the particulate objects that have adhered to the lower part of the object to be processed are blown off and away by the air that is blown from the blowing part of the air-blowing machine. The particulate objects are suctioned by a flow path that is formed by the second flow path. Thus, even when the hood is provided, the particulate objects that have adhered to the lower part of the object to be processed can be effectively removed. 
     The shot-processing device of a seventh aspect of the present invention, in the configuration of any of the first to sixth aspects, comprises a receiving part at the side for taking out that protrudes from the cabinet under a port for taking out, in the plan view of the device. It also comprises a duct for taking out that connects the receiving part at the side for taking out with the cabinet and causes the shots that have dropped on the receiving part at the side for taking out to flow to the upstream side of the route for circulation in the cabinet. 
     By the above configuration, the receiving part at the side for taking out protrudes from the cabinet under the port for taking out of the cabinet in the plan view of the device. Thus, even when the particulate objects fall from the port for taking out or near it, they are received by means of the receiving part at the side for taking out. Further, the receiving part at the side for taking out is connected to the cabinet by means of the duct for taking out. The duct for taking out causes the shots that have dropped on the receiving part at the side for taking out to flow to the upstream side of the route for circulation in the cabinet. Thus, the shots that have fallen near the port for taking out can be returned to the shot-projecting machine. 
     The shot-processing device of an eighth aspect of the present invention, in the configuration of any of the first to seventh aspects, comprises an access door to open and close a side opening of the cabinet. It also comprises a receiving part at a side wall under the side opening, which part protrudes from the cabinet in the plan view of the device. It also comprises a duct at the side wall that connects the receiving part at the side wall with the cabinet and causes the shots that have dropped on the receiving part at the side wall to flow to the upstream side of the route for circulation in the cabinet. 
     By the above configuration, the access door can open and close the side opening of the cabinet. The receiving part at the side wall is provided under the side opening to protrude from the cabinet in the plan view of the device. Thus, even when the particulate objects drop from the side opening or near it when the access door is opened for checking or cleaning the inside of the cabinet or the like, the particulate objects are received by means of the receiving part at the side wall. The receiving part at the side wall and the cabinet are connected by means of the duct at the side wall. The duct causes the shots that have dropped on the receiving part at the side wall to flow in the upstream direction of the route for circulation in the cabinet. Thus, the shots that drop from the side opening or near it can be returned to the shot-projecting machine. 
     The shot-processing device of a ninth aspect of the present invention, in the configuration of any of the first to eighth aspects, comprises a cylindrical ventilator that is provided to the ceiling of the cabinet and that takes ambient air in. It also comprises a cartridge that is placed in the ventilator and has a filter that is pleated and faces horizontally. 
     By the above configuration, the cylindrical ventilator that takes ambient air in is provided to the ceiling of the cabinet. The cartridge that has a filter that is pleated and faces horizontally is placed in the ventilator. Thus, clogging of the ventilator is prevented. 
     As discussed above, by the shot-processing device of the present invention excellent effects, such that the shots are effectively reused and prevented from being taken out of the cabinet or from scattering, are achieved. 
     The basic Japanese patent application, No. 2017-187864, filed Sep. 28, 2017, is hereby incorporated by reference in its entirety in the present application. 
     The present invention will become more fully understood from the detailed description given below. However, the detailed description and the specific embodiments are only illustrations of the desired embodiments of the present invention, and so are given only for an explanation. Various possible changes and modifications will be apparent to those of ordinary skill in the art on the basis of the detailed description. 
     The applicant has no intention to dedicate to the public any disclosed embodiment. Among the disclosed changes and modifications, those which may not literally fall within the scope of the present claims constitute, therefore, a part of the present invention in the sense of the doctrine of equivalents. 
     The use of the articles “a,” “an,” and “the” and similar referents in the specification and claims are to be construed to cover both the singular and the plural form of a noun, unless otherwise indicated herein or clearly contradicted by the context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein is intended merely to better illuminate the invention, and so does not limit the scope of the invention, unless otherwise stated. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a front view of the shot-peening device, which is an embodiment of the present invention. Some elements in the front side, such as the receiving part at the side for taking out, are shown in perspective. Their outlines are drawn by two-dotted lines. 
         FIG. 2  is an enlarged side view taken along line  2 - 2  in  FIG. 1 . 
         FIG. 3  is an enlarged side view taken along line  3 - 3  in  FIG. 1 . 
         FIG. 4  is a plan view of the shot-peening device, which is an embodiment of the present invention. 
         FIG. 5  illustrates a cross section of the chamber for blowing air of the shot-peening device as in  FIG. 1 . 
         FIG. 6  is a plan view that simply illustrates a state wherein the objects to be processed are held. 
         FIG. 7  is a side view of the receiving part at the side for taking out, the duct for taking out, and their periphery. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A shot-peening device  10 , which is a shot-processing device as an embodiment of the present invention, is below discussed with reference to  FIGS. 1-7 . In the drawings, the arrows FR, UP, and LH denote the front direction, the upper direction, and the left direction in a front view of the device, respectively. The shot-peening device  10  is, for example, a device for shot-peening a pulley for a CVT (Continuously Variable Transmission). 
     Configuration of Embodiment 
       FIG. 1  illustrates a front view of the shot-peening device  10 , which is an embodiment of the present invention. In  FIG. 1  some elements (a receiving part  80  at the side for taking out, etc., which are discussed below) are shown as being transparent and their outlines are shown by two-dotted lines.  FIG. 2  shows an enlarged side view taken along the line  2 - 2  in  FIG. 1 .  FIG. 3  shows an enlarged side view taken along the line  3 - 3  in  FIG. 1 . 
     As in  FIG. 1 , the shot-peening device  10  has a cabinet  12  that is formed like a box. In the cabinet  12  a part  13  for supplying the shots is provided. A port for supplying the shots is formed at the top of the part  13  for supplying the shots. In the cabinet  12  a port  14  for carrying an object W to be processed in and out of it is formed. The port for carrying in and out functions as a port for carrying the work W in the cabinet and as a port for carrying the work W out of the cabinet. At the lower position of the cabinet  12  a part  50 S for placing a product is provided to place the object W on it. The details of the part  50 S are discussed below. 
     As in  FIG. 2 , in the cabinet  12  an access door  18  is provided. The access door  18  opens and closes a side opening  16  of the cabinet  12 .  FIG. 4  illustrates a plan view of the shot-peening device  10 . As in  FIG. 4 , as an example in the embodiment, the access doors  18  are located at the right and left sides and the rear side of the cabinet  12 . Incidentally, the access door  18  overlaps a peripheral wall of the cabinet  12  in  FIG. 4 . Thus, the reference number “18” points to the overlapping position. 
     As in  FIG. 1 , at the right side of the cabinet  12  an operator&#39;s panel  100  is provided. A control panel  102  that is connected to the operator&#39;s panel  100  includes a storage device that stores a program for controlling the shot-peening device  10 . The shot-peening device  10  is operated by running the program in accordance with the operation of a panel by an operator. 
     At the right side of the ceiling  12 U of the cabinet  12  a ventilator  46 , which is tubular, takes the outside air in. Inside the ventilator  46  a cartridge  48  is disposed. The cartridge  48  is a cartridge for a dust collector, which is converted to this use. It has a filter  48 F (the details are not shown), wherein a filter medium is horizontally folded in a zig-zag manner. Incidentally, the cartridge for the dust collector is disclosed, for example, in a Patent Gazette, U.S. Pat. No. 5,218,451. 
     As in  FIG. 4 , in the cabinet  12  a transporter  50  is provided. The transporter  50  transports an object W to be processed (see  FIG. 1 ) (below, a description of a figure to be referred to is arbitrarily omitted) in the set direction for transportation (the direction of the arrow X) within the cabinet  12 . The transporter  50  includes the part  50 S for placing a product. The details of the transporter  50  are discussed below. 
     Multiple chambers are formed in the cabinet  12 . At the rear side of the inside of the cabinet  12  a chamber  24  for projecting the shots is formed. At the front side of the inside of the cabinet  12  a chamber  20  for taking in and out is formed. In the chamber  24  for projecting the shots a surface treatment (specifically, a shot-peening treatment) on the object W to be processed is carried out by causing the shots to hit the object W. In the cabinet  12  the chamber  20  for taking in and out doubles as a chamber for taking in the object W and as a chamber for taking it out. In the cabinet  12  an idle chamber  22  is formed at the upstream side of the chamber  24  for projecting the shots in the direction for transportation (the direction of the arrow X). In the cabinet  12  a chamber  26  for blowing air is formed at the downstream side of the chamber  24  for projecting the shots in the direction for transportation (the direction of the arrow X). In the chamber  26  for blowing air gas is blown onto the object W. 
     The chamber  20  for taking in and out, the idle chamber  22 , the chamber  24  for projecting the shots, and the chamber  26  for blowing air, are divided by partitions  28  that are wall panels and are formed side by side about a vertical axis of the device (specifically, a rotating shaft  62 , which is later discussed). They may also be called “stations.” In other words, multiple stations are formed by equally dividing the inside of the cabinet  12  in the circumferential direction. Incidentally, the chambers are just divided by the partitions  28  and are not hermetically divided. 
     On the ceiling of the chamber  24  for projecting the shots a plurality of nozzles  30 A of a blasting machine (also called “an air-type accelerator”)  30 , as the shot-projecting machine, are provided (see  FIGS. 2 and 3 ). The blasting machine  30  projects the shots onto the object W by blasting (“projecting” in a broader meaning) compressed air that includes the shots through the nozzles  30 A (see  FIGS. 2 and 3 ). Here, the object W has been transported to the chamber  24  for projecting the shots. Incidentally, in this embodiment micro-shots of a particle size of about 50 microns are used as the shots. 
     The nozzles  30 A as in  FIG. 3  are connected to Magna Valves  30 C (“flow control valves” in a broader meaning) through a piping  30 B. The Magna Valves  30 C are shown in the lower-left part of  FIG. 3 . They are connected to a part  30 D for supplying air (see  FIG. 4 ) and to a pressurized tank  30 F through gate cutters  30 E. Parts  30 M for mixing that are located under the Magna Valves  30 C mix the shots from the pressurized tanks  30 F and compressed air from the part  30 D for supplying air (see  FIG. 4 ). The pressurized tanks  30 F are connected to an upper-side hopper  30 H through gates  30 G for the shots that are located above the pressurized tanks  30 F. A pressure switch  31 A (see  FIG. 1 ) is provided near the pressurized tanks  30 F. Incidentally, flowmeters  31 B for air are provided at the rear side of the device as in  FIG. 2 . The upper-side hopper  30 H is located above the gates  30 G for the shots as in  FIG. 3 . A level switch  31 C is provided to it. 
     In the shot-peening device  10  the circulating machine  32  is provided. It circulates the shots to the blasting machine  30  by transporting to the upper-side hopper  30 H the shots that have a diameter that makes them reusable out of the shots that have been projected (projected in a broader meaning) through the nozzles  30 A by the blasting machine  30  and have dropped on the bottom of the chamber  24  for projecting the shots. The shots that have a diameter that makes them reusable are those that have a diameter by which a desired effect (more than a set level) on a surface treatment can be obtained when they are projected (projected in a broader meaning). They include at least the shots that have a diameter that is equivalent to (substantially equal to) the diameter of unused shots, which are not yet supplied to the shot-peening device  10  (the shot-processing device in a broader meaning) to be projected (projected in a broader meaning). The shots that have a diameter that makes them reusable do not include, for example, the shots that have been broken in the chamber  24  for projecting the shots. As in  FIG. 7 , the circulating machine  32  has a hopper  32 A that collects the shots at the lower side of the chamber  24  for projecting the shots. A lower-side screw conveyor  32 B is provided at the lower end of the hopper  32 A. 
     As in  FIG. 1 , the lower-side screw conveyor  32 B is horizontally positioned so that its longitudinal axis runs from the right d to the left in the device. By being rotated around the axis by being driven by a motor, it transports the shots that have dropped from the hopper  32 A (see  FIG. 7 ) in the left direction of the device. The downstream end of the lower-side screw conveyor  32 B is located next to a box  32 C for collection, which is shown in  FIG. 3 . In the box  32 C for collection a lower end of a duct  34 A, which is vertically elongated, is located. The upper end of the duct  34 A is connected to a first cyclone  36  as the first classifier that constitutes a part of the classifying part  35 . That is, the first cyclone  36  is located in the route for circulation of the circulating machine  32 . 
     As in  FIG. 1 , the first cyclone  36  has a cyclone-case  36 H. The top of the cyclone-case  36 H is connected to the suction port  70 A of the dust collector  70  through a duct  34 B. The dust collector  70  has a fan. It is connected to the cabinet  12  through the duct  34 B, the first cyclone  36 , and the duct  34 A (see  FIG. 3 ) to suction air that contains dust in the cabinet  12  by activating the fan. The upper part  36 A of the cyclone-case  36 H is formed as a vertical cylinder. Its lower part  36 B is formed as a cone, which has a smaller diameter, as it is lower. As in  FIG. 3 , on the side wall of the upper part  36 A of the cyclone-case  36 H a part  36 X for inflow is formed to cause air to flow along the inner wall of the upper part  36 A. The part  36 X for inflow is formed approximately as a cylinder and is connected to the duct  34 A, which is discussed above. 
     As in  FIG. 1 , the lower part  36 B of the cyclone-case  36 H is connected to a box  36 Z for collection. By the above configuration, the first cyclone  36  classifies the particulate objects that include the shots as shots that have a diameter that makes them reusable and as the other particulate objects. The box  36 Z for collection is connected to a receiving box  32 E through a pipe  32 D. The receiving box  32 E is provided at the lower end of the bucket elevator  32 F. That is, the shots that have a diameter that makes them reusable are classified by means of the first cyclone  36  and are supplied to the lower end of the bucket elevator  32 F through the pipe  32 D and the receiving box  32 E. In the drawing the middle part of the pipe  32 D is omitted and drawn by a dotted line. A vibrating sieve (not shown) may be provided between the box  36 Z for collection and the receiving box  32 E. 
     Since the bucket elevator  32 F is publicly known, the detailed discussion on its configuration is omitted. In it an endless belt (not shown) is looped around pulleys that are disposed to be vertically separated. Many buckets (not shown) are attached to the endless belt. The pulleys are rotated by being driven by a motor. By the above configuration, the bucket elevator  32 F can scoop the shots by the buckets and transport them from the lower part of the device to the upper part (above the cabinet  12 ) by rotating the pulleys. The upper end of the bucket elevator  32 F is connected to the upper end of the upper-side hopper  30 H through a receiving box  32 G and a pipe  32 H. That is, the shots that are thrown from the upper end of the bucket elevator  32 F are supplied to the upper-side hopper  30 H through the receiving box  32 G and the pipe  32 H. 
     From the cabinet  12 , under the port  14  for carrying in and out, the receiving part  80  at the side for taking out protrudes as in the plan view of the device of  FIG. 4 . Above the receiving part  80  at the side for taking out, a part of a machine  90  for taking the object W in and out of the cabinet  12  moves. The receiving part  80  at the side for taking out is made of a hopper-like container. Its bottom is open. 
       FIG. 7  illustrates a side view of the receiving part  80  at the side for taking out and its surrounding area. In it a hatching of cross-sections of the cabinet  12  and its surrounding area is omitted. As in  FIG. 7 , the bottom of the receiving part  80  at the side for taking out and that of the chamber  24  for projecting the shots of the cabinet  12  are connected by the duct  82  for taking out. The duct  82  for taking out causes the shots that have dropped in the receiving part  80  at the side for taking out to flow to the lower part of the chamber  24  for projecting the shots (the upstream side of the route for circulation in the circulating machine  32 ) within the cabinet  12 . In addition, the end of the duct  82  for taking out at the side near the cabinet  12  is located slightly higher than the end at the side near the receiving part  80  at the side for taking out. Since the inside of the chamber  24  for projecting the shots is a vacuum, as it is suctioned by the dust collector  70  (see  FIG. 1 ), the duct  82  for taking out causes the shots to flow from the receiving part  80  at the side for taking out to the cabinet  12 . 
     From the cabinet  12  under the side opening  16  as in  FIG. 2 , a receiving part  84  at the side wall protrudes in the plan view of the device of  FIG. 4 . As in  FIG. 2 , the receiving part  84  at the side wall and the cabinet  12  are connected through the duct  86  at the side wall. The end of the duct  86  at the side wall at the cabinet  12  is located lower than the end of it at the receiving part  84  at the side wall. The duct  86  at the side wall downwardly inclines from the receiving part  84  at the side wall to the cabinet  12  to cause the shots that have dropped in the receiving part  84  at the side wall to fall to the lower part of the cabinet  12  (the upstream side of the route for circulation in the circulating machine  32 ). 
     Next, the transporter  50  as in  FIG. 1 , and the part  50 S for placing a product that constitutes it, are discussed. 
     In the part  50 S for placing a product, a large table (also called “a turntable” or “a revolving table”)  52  that is circular as in  FIG. 4  is provided. A plurality of (four in this embodiment) small tables (also called “rotating tables”)  54  are annularly provided with a constant distance between them in the outer circumference on the top of the large table  52 . That is, the part  50 S for placing a product has a configuration of so-called multiple tables. The large table  52  can revolve about the vertical rotating shaft  62 . The plurality of the small tables  54  have a smaller diameter than the large table  52  and are rotatable on the large table  52 . The object W to be processed is held on each of them. Rotating shafts  55  (see  FIG. 7 ) of the small tables  54  are parallel to the rotating shaft  62  of the large table  52 . The partitions  28  may rotate together with the large table  52 . 
     The small table  54  as in  FIG. 4  comes in, and goes out of, the chamber  20  for taking in and out, the idle chamber  22 , the chamber  24  for projecting the shots, the chamber  26  for blowing air, and the chamber  20  for taking in and out, in this order, when the large table  52  rotates. In the partitions  28  notches are formed to cause the small tables  54  and the object W to pass therethrough when the large table  52  rotates. In a sheet-like cover that is provided at the outer circumference of the large table  52  in the cabinet  12  apertures (not shown) are formed to pass through them. 
     The blasting machine  30  projects the shots onto the object W that is held on the small table  54  that enters the chamber  24  for projecting the shots. As in  FIG. 7 , a first part  59 A for engagement is fixed under the small tables  54  and fixed coaxially with the rotating shaft  55 . Under the area to be projected in the large table  52  a second part  59 B for engagement that engages the first part  59 A for engagement is provided. The second part  59 B for engagement is rotated about the rotating shaft by a driving mechanism (not shown). That is, when the small table  54  is located at a set position in the chamber  24  for projecting the shots, the first part  59 A for engagement engages the second part  59 B for engagement so that a driving force that is originated by the driving mechanism is transmitted to the first part  59 A for engagement to rotate the small table  54 . 
     The lower end of the rotating shaft  62  of the large table  52  is placed on a base  65  through a bearing  64 . The upper end of it is connected to an indexing machine  60  (an element that is known as a rotating mechanism in a broader meaning) through a coupling (not shown). 
     Since the indexing machine  60  is one that is publicly known, the detailed illustration is omitted. It has a servomotor that intermittently rotates the large table  52  as in  FIG. 4 . By this configuration the indexing machine  60  rotates the large table  52  about the rotating shaft  62  at an angle (90° in this embodiment) that is determined based on the arrangement of the small tables  54 . That is, the indexing machine  60  intermittently rotates the large table  52  at an angle that is determined based on the positions of the small tables  54 . When the indexing machine  60  temporarily stops the large table  52  (when it is in the position to stop the rotating), the small tables  54  are located at each of the set positions of the chamber  20  for taking in and out, the idle chamber  22 , the chamber  24  for projecting the shots, and the chamber  26  for blowing air. Incidentally, a machine for intermittently rotating that has a driving motor with a brake for intermittently rotating the large table  52 , a clamp for positioning the large table  52 , and a cylinder for positioning the clamp, may be used instead of the indexing machine  60 , which has a servomotor. 
       FIG. 5  illustrates a sectional view of the chamber  26  for blowing air of the shot-peening device  10 . In it the hatching of cross-sections is omitted.  FIG. 6  illustrates a simplified plan view of the chamber  26  for blowing air that holds the object W. As in  FIGS. 5 and 6 , the small tables  54  are equipped with a jig  56  for holding the object W on which the object W is placed. Incidentally, the cross-sections of the jig  56  and its surrounding area as in  FIG. 5  show a reduced sectional view along the line  5 - 5  in  FIG. 6 . The jig  56  has multiple supporting parts  56 A (for example, three in this embodiment) that support the object W from below and are disposed with a gap in the circumferential direction between them in the plan view of the device. In the jig  56  the spans between the supporting parts  56 A that are next to each other in the circumferential direction are formed as a notch that opens upwardly. 
     In this embodiment a tubular hood  57  is provided outside the object W in the plan view of the device. Multiple jigs  58  for the hood (for example, four in this embodiment) are provided to support the hood  57  from below. The jigs  58  for the hood are disposed with a gap in the circumferential direction, in the plan view of the device. 
     At the upper part of the chamber  24  for projecting the shots as in  FIG. 3 , a mechanism  66  for pressing (a jig for pressing) is provided. Since it is a known structure, the detailed explanation is omitted. Below, its outline is discussed. The mechanism  66  for pressing has a part  68 A for pressing that presses the object W on the small tables  54  from above. The part  68 A for pressing is the lower end of a shaft  68  for pressing. The upper end of the shaft  68  for pressing is supported by a bearing (not shown). The shaft  68  for pressing cannot vertically move in relation to the bearing. But it can rotate about its central axis in relation to it. By this configuration the part  68 A for pressing can rotate about a vertical axis. The bearing can be vertically moved by a cylinder (an element that is recognized as “a vertically moving mechanism”), which is not shown. That is, by the action of the cylinder, the part  68 A for pressing can be displaced between a position to press the object W and a retracted position that is higher than the position to press. 
     For example, the cylinder is a measuring device so that the mechanism  66  for pressing can detect the object W. Thus, shot-peening is carried out when the object W is definitely pressed. 
     As in  FIG. 5 , an air-blowing machine  72  is provided to the chamber  26  for blowing air. The air-blowing machine  72  has nozzles  74 A,  74 B,  74 C. The nozzles  74 A,  74 B,  74 C are connected to a part for supplying compressed air, which is not shown, through hoses  76 A,  76 B,  76 C. By this configuration the air-blowing machine  72  blows gas through the nozzles  74 A,  74 B,  74 C against the object W that has been transported to the chamber  26  for blowing air. In the air-blowing machine  72  the nozzles  74 A,  74 B,  74 C can be vertically moved by means of a vertically moving mechanism, which is not shown. 
     As in  FIG. 6 , by the nozzle  74 C, which is the blowing part of the air-blowing machine  72 , the direction of the gas to be blown (the arrow  74 X) is set so that the gas passes through a gap between the adjacent supporting parts  56 A. Further, by the nozzle  74 C the direction of the gas to be blown (the arrow  74 X) is set so that the gas passes through a gap between the adjacent jigs  58  for the hood. 
     Next, a connection between the cabinet  12  and the dust collector  70  as in  FIGS. 1 and 4  is discussed. 
     A structure  40  for the flow path that connects the inside of the cabinet  12  and the suction port  70 A of the dust collector  70  includes a first flow path  40 X that constitutes a part of the route for circulation of the circulating machine  32  (the duct  34 A in  FIG. 3  and the first cyclone  36 ). In the structure  40  for the flow path, the classifying part  35  is provided that classifies the particulate objects that include the shots as shots that have a diameter that makes them reusable and as the other particulate objects. The first cyclone  36 , which constitutes a part of the classifying part  35 , includes a part of the first flow path  40 X. 
     The structure  40  for the flow path includes a second flow path  40 Y that connects the chamber  26  for blowing air (see  FIG. 4 ) and the suction port  70 A (see  FIG. 1 ) of the dust collector  70 . In the second flow path  40 Y a second cyclone  44  as a second classifier is provided. That is, the second cyclone  44  includes a part of the second flow path  40 Y. It constitutes a part of the classifying part  35 . The second cyclone  44  and the first cyclone  36  are positioned apart from each other. The first cyclone  36  is nearer from the cabinet  12  than the second cyclone  44  is. 
     As in  FIG. 1 , the second cyclone  44  has a cyclone-case  44 H. The top of the cyclone-case  44 H is connected to the suction port  70 A of the dust collector  70  through a duct  42 C and the duct  34 B. One end of the duct  42 C is connected to the top of the cyclone-case  44 H and the other end is connected to the flow path of the duct  34 B. 
     The upper part  44 A of the cyclone-case  44 H is formed as a vertical cylinder and the lower part  44 B is formed as a cone, which has a smaller diameter, as it is lower. On the side wall of the upper part  44 A of the cyclone-case  44 H a part  44 X for inflow is formed to cause air to flow along the inner surface of the upper part  44 A. The part  44 X for inflow has an approximately cylindrical shape. One end of a duct  42 B is connected to it. The other end of it is connected to the ceiling of the chamber  20  for taking in and out (see  FIG. 4 ). One end of a duct  42 A is connected to the flow path of the duct  42 B at a position that is near the other end. In other words, the structure  40  for the flow path includes a third flow path  40 Z that connects the chamber  20  for taking in and out (see  FIG. 4 ) and the suction port  70 A of the dust collector  70 . The second cyclone  44  includes a part of the third flow path  40 Z. As in  FIG. 4 , the other end of the duct  42 A is connected to the ceiling of the chamber  26  for blowing air. 
     As in  FIG. 1 , the lower opening of the lower part  44 B of the cyclone-case  44 H is connected to a box  44 Z for collection. By the above configuration, the second cyclone  44  classifies the particulate objects that include the shots as shots that have a diameter that makes them reusable and as the other particulate objects. As in  FIG. 2 , the box  44 Z for collection is connected through a pipe  32 J to the receiving box  32 E that is provided at the lower end of the bucket elevator  32 F. That is, the shots that have a diameter that makes them reusable and that have been separated by the second cyclone  44  are supplied to the lower end of the bucket elevator  32 F through the pipe  32 J and the receiving box  32 E. In the figure, the middle part of the pipe  32 J is omitted and drawn by a dotted line. 
     Functions and Advantageous Effects of Embodiment 
     Next, the functions and advantageous effects of the embodiment are discussed. 
     The object W to be processed is transported by the machine  90  for taking in and out as in  FIG. 4  to the chamber  20  for taking in and out in the cabinet  12 . The object W that has been taken in the cabinet  12  is transported by the transporter  50  in the set direction for transportation (the arrow X). After it stays for a time in the idle chamber  22 , it is transported to the chamber  24  for projecting the shots. The object W that has been transported to the chamber  24  for projecting the shots is pressed by the mechanism  66  for pressing (see  FIG. 3 ). Then the blasting machine  30  projects the shots onto the object W. After projecting the shots for a set time, the object W is released from the mechanism  66  for pressing (see  FIG. 3 ) that presses it. It is transported to the chamber  26  for blowing air. The air-blowing machine  72  as in  FIG. 5  blows gas on the object W that has been transported to the chamber  26  for blowing air. Then the object W is transported to the chamber  20  for taking in and out as in  FIG. 4 . It is taken out of the cabinet  12  from the chamber  20  for taking in and out by the machine  90  for taking in and out. 
     The shots that have been projected by the blasting machine  30  as in  FIG. 3 , etc., and have dropped on the bottom of the chamber  24  for projecting the shots are transported by means of the lower-side screw conveyor  32 B to the box  32 C for collection. The shots that have been transported to the box  32 C for collection are supplied to the lower end of the bucket elevator  32 F through the duct  34 A, the first cyclone  36 , the pipe  32 D as in  FIG. 1 , and the receiving box  32 E. After having been transported above the device by the bucket elevator  32 F, they are supplied to the upper-side hopper  30 H through a receiving box  32 G and a pipe  32 H. That is, the shots that have been projected by the blasting machine  30  as in  FIG. 3  and have dropped on the bottom of the chamber  24  for projecting the shots are circulated to the blasting machine  30  by means of the circulating machine  32 . 
     The dust collector  70  as in  FIG. 4 , which is connected to the cabinet  12 , suctions air in the cabinet  12  that contains dust. The structure  40  for the flow path, which connects the inside of the cabinet  12  and the suction port  70 A (see  FIG. 1 ) of the dust collector  70  includes the first flow path  40 X that constitutes a part of the route for circulation of the circulating machine  32 . The first cyclone  36  includes a part of the first flow path  40 X. The first cyclone  36  classifies the particulate objects that include the shots as shots that have a diameter that makes them reusable and as the other particulate objects. Thus, the circulating machine  32  can circulate the shots that have a diameter that makes them reusable to the blasting machine  30 . 
     The structure  40  for the flow path includes the second flow path  40 Y that connects the chamber  26  for blowing air and the suction port  70 A (see  FIG. 1 ) of the dust collector  70 . The second cyclone  44  includes a part of the second flow path  40 Y. Thus, the particulate objects that are stirred up from the object W, etc., because of air-blowing caused by the air-blowing machine  72  (see  FIG. 5 ) in the chamber  26  for blowing air, are suctioned to the second flow path  40 Y. They are classified as shots that have a diameter that makes them reusable and as the other particulate objects by means of the second cyclone  44 . Thus, the shots are prevented from being taken out of the cabinet or from scattering, so that the shots can be effectively reused. 
     In the present embodiment, the second cyclone  4  includes a part of the third flow path  40 Z and is connected to the chamber  20  for taking in and out in the cabinet  12  through the duct  42 B. Thus, even if the particulate objects in the chamber  26  for blowing air are not all suctioned and transported to the chamber  20  for taking in and out, the particulate objects in the chamber  20  for taking in and out are suctioned to the duct  42 B, which is connected to the chamber  20 . The particulate objects that have been suctioned are classified as shots that have a diameter that makes them reusable and as the other particulate objects by means of the second cyclone  44 . Thus, the shots are prevented from being taken out of the chamber  20  for taking in and out or from scattering, so that the shots can be effectively reused. 
     In the present embodiment, the first cyclone  36 , which includes a part of the first flow path  40 X, is located nearer from the cabinet  12  than the second cyclone  44  is, which includes a part of the second flow path  40 Y. Thus, the shots can be circulated with less loss. 
     In the present embodiment, the jig  56  for the object W as in  FIG. 6  has multiple supporting parts  56 A that are located with a gap in the circumferential direction between them in the plan view of the device and that support the object W from below. The direction of blowing air (the arrow  74 X) through the nozzle  74 C of the air-blowing machine  72  is set to cause the air to pass through a gap between the adjacent supporting parts  56 A. Thus, the particulate objects that have adhered to the lower part of the object W are blown off and away by gas that is blown through the nozzle  74 C of the air-blowing machine  72 , to be suctioned to the duct  42 A (see  FIG. 4 ). Thus, the particulate objects that have adhered to the lower part of the object W can be effectively removed. 
     Further, in the present embodiment, the tubular hood  57  is provided outside the object W in the plan view of the device so that no shots hit the outside of the object W. Multiple jigs  58  for the hood that are located with a gap in the circumferential direction in the plan view of the device support the hood  57  from below. The direction of blowing air (the arrow  74 X) through the nozzle  74 C is set to cause the air to pass through a gap between the adjacent jigs  58  for the hood. Thus, when the hood  57  is provided outside the object W, the particulate objects that have adhered to the lower part of the object W are blown off and away by gas that is blown through the nozzle  74 C, to be suctioned to the duct  42 A (see  FIG. 4 ). Thus, the particulate objects that have adhered to the lower part of the object W can be effectively removed. 
     In the present embodiment, the receiving part  80  at the side for taking out as in  FIG. 2  protrudes from a position under the port  14  for carrying in and out (see  FIG. 1 ) of the cabinet  12  in the plan view of the device as in  FIG. 4 . Thus, if the particulate objects drop from the port  14  for carrying in and out (see  FIG. 1 ) or its surrounding area when the object W is taken out of the cabinet  12 , they are received by the receiving part  80  at the side for taking out. Thus, the floor in front of the port  14  for carrying in and out (see  FIG. 1 ) is prevented from becoming dirty from the particulate objects. As in  FIG. 7 , the receiving part  80  at the side for taking out is connected to the cabinet  12  by means of the duct  82  for taking out. The duct  82  for taking out causes the shots that have dropped on the receiving part  80  at the side for taking out to flow to the lower part of the chamber  24  for projecting the shots (the upstream side of the route for circulation of the circulating machine  32 ) in the cabinet  12 . Thus, the shots that have dropped from the port  14  for carrying in and out (see  FIG. 1 ) or its surrounding area can be returned to the blasting machine  30  (see  FIG. 3 ). 
     In the present embodiment, the access door  18 , which is shown in  FIG. 2 , etc., can open and close the side opening  16  of the cabinet  12 . The receiving part  84  at the side wall protrudes from a position under the side opening  16  of the cabinet  12  in the plan view of the device as in  FIG. 4 . Thus, if the particulate objects drop from the side opening  16  or its surrounding area when the access door  18  is opened to check or clean the inside of the cabinet  12 , the particulate objects are received by the receiving part  84  at the side wall. Thus, the part of the cabinet under the side opening  16  is prevented from becoming dirty. The receiving part  84  at the side wall is connected to the cabinet  12  through the duct  86  at the side wall. The duct  86  at the side wall causes the shots that have dropped on the receiving part  84  at the side wall to flow to the lower part of the cabinet  12  (the upstream side of the route for circulation of the circulating machine  32 ). Thus, the shots that have dropped from the port  16  for carrying in and out (see  FIG. 1 ) or its surrounding area can be returned to the blasting machine  30  (see  FIG. 3 ). 
     As discussed above, by the shot-peening device  10  of the present embodiment the shots are effectively reused and are prevented from being taken out of the cabinet  12  or from scattering. 
     As a supplement, since micro-shots are expensive when used as the shots, there is a need to effectively reuse the shots. For example, the object to be processed is assumed to be a pulley for a CVT. If a pulley for a CVT is taken out of the cabinet, while the micro-shots adhere to it, and is used as a part of a machine, the machine may cause trouble. By the present embodiment, the shots are effectively reused and the object to which the shots adhere is prevented, or is effectively suppressed, from being taken out. 
     In the present embodiment, a cylindrical ventilator  46  for taking in the outside air is provided to the ceiling  12 U of the cabinet  12  as in  FIG. 1 . In the ventilator  46  the cartridge  48  is provided. The cartridge  48  has the filter  48 F, wherein a filter medium is horizontally folded in a zig-zag manner. Thus, the ventilator  46  is prevented from clogging. 
     Supplemental Explanation of Embodiment 
     By the above embodiment, the shot-processing device is the shot-peening device  10 . However, it may be a shot-blasting device or a device for both shot-peening and shot-blasting. 
     By the above embodiment, the shot-projecting machine is the blasting machine  30  of an air-nozzle type as in  FIG. 4 , etc. However, it may be a shot-projecting machine other than the blasting machine  30 , such as a shot-projecting machine of a centrifugal type. 
     By the above embodiment, the shots are micro-shots that are very fine particles. However, shots other than the micro-shots may be used for the shot-processing device. Further, by the above embodiment, the classifiers are the first cyclone  36  and the second cyclone  44 . However, the classifiers may be ones other than cyclones. 
     By the above embodiment, the transporter  50  transports the object W in the circumferential direction in the cabinet  12 . However, the transporter as a modified example may linearly transport the object in the set direction for transportation, wherein the upstream end or downstream end of the route for transportation is outside the cabinet and the cabinet is in the route for transportation. In such a cabinet, the chamber for projecting the shots, the chamber for blowing air, and the chamber for taking out, are formed in this order from the upstream side. 
     By the above embodiment, the second cyclone  44  is connected to the chamber  26  for blowing air and to the chamber  20  for taking in and out, through the ducts  42 B and  42 A. However, in a modified example, the second cyclone  44 , as a second classifier, which includes a part of the second flow path  40 Y, may be connected to the chamber  26  for blowing air through a duct, but need not be connected to the chamber  20  for taking in and out. 
     By the above embodiment, both the first cyclone  36  and the second cyclone  44  are provided. However, as a modified example, a classifier that includes a part of the first flow path  40 X and a classifier that includes a part of the second flow path  40 Y may be integrated. 
     By the above embodiment, the first flow path  40 X and the second flow path  40 Y are separately formed without any combined part. However, they may be formed with a combined part. By the above embodiment, the third flow path  40 Z has a part that is used as the second flow path  40 Y (a part combined with the second flow path  40 Y). However, the third flow path may be formed without any part that is used as the second flow path  40 Y. In such a case a classifier (an element that is a part of a classifying part) that includes a part of the third flow path may be separately formed. By the above embodiment, the third flow path  40 Z has no part that is used as the first flow path  40 X. However, it may be formed with a part that is used as the first flow path. 
     By the above embodiment the jig  56  as in  FIG. 6  has multiple supporting parts  56 A that support the object from below and are located with a gap in the circumferential direction in the plan view of the device. Though this configuration is preferable, the jig may have a supporting part that supports the object from below and is formed as a ring in the plan view of the device. 
     By the above embodiment, the tubular hood  57  is provided outside the object in the plan view of the device. However, such a hood does not need to be provided, depending on the purpose of the surface treatment. 
     By the above embodiment, multiple jigs  58  for the hood support the hood  57  from below and are located with a gap in the circumferential direction in the plan view of the device. Though this configuration is preferable, as a modified example a jig for the hood may support the hood from below and may be formed as a ring in the plan view of the device. 
     By the above embodiment, the receiving part  80  at the side for taking out and the duct  82  for taking out are provided as in  FIG. 7 . Though this configuration is preferable, as a modified example they are not necessarily provided. 
     By the above embodiment, the receiving part  84  at the side wall and the duct  86  at the side wall are provided as in  FIG. 2 , etc. Though this configuration is preferable, as a modified example they are not necessarily provided. 
     By the above embodiment, the cartridge  48  is provided in the ventilator  46  for taking in the outside air as in  FIG. 1 . Though this configuration is preferable, a sponge-like element that is made of a stainless steel may be provided in it. 
     As a modified example of the above embodiment, the bucket elevator  32 F is not provided and the lower end of the first cyclone  36  and the upper-side hopper  30 H may be connected by means of a pipe. 
     The above embodiment and any of the above-mentioned modifications may be appropriately combined. 
     Above an embodiment of the present invention is discussed. The present invention is not limited by the above discussions. It can be obviously implemented with any modifications other than those specified in the above discussion, insofar as it does not deviate from the gist of the invention. 
     Below, the reference signs used in the present specification and the drawings are listed.
           10  the shot-peening device (the shot-processing device)     12  the cabinet     12 U the ceiling of the cabinet     14  the port for carrying in and out (the port for taking out)     16  the side opening     18  the access door     20  the chamber for taking in and out (the chamber for taking out an object to be processed)     24  the chamber for projecting the shots     26  the chamber for blowing air     30  the projecting machine (the shot-projecting machine)     32  the circulating machine     35  the classifying part     36  the first cyclone (the first classifier)     40  the structure for the flow path     40 X the first flow path     40 Y the second flow path     40 Z the third flow path     44  the second cyclone (the second classifier)     46  the ventilator     48  the cartridge     48 F the filter     50  the transporter     56  the jig     56 A the supporting parts     57  the hood     58  the jigs for the hood     70  the dust collector     70 A the suction port of the dust collector     72  the air-blowing machine     74 C the nozzle (the blowing part)     74 X the direction of the gas to be blown     80  the receiving part at the side for taking out     82  the duct for taking out     84  the receiving part at the side wall     86  the duct at the side wall   W the object to be processed