Abstract:
A polishing mechanism includes a support base, a pair of magnetic valves, a first polishing assembly and a second polishing assembly. The pair of magnetic valves are mounted in the support base. The first polishing assembly and the second polishing assembly are mounted on the support base and connected to the pair of magnetic valves respectively. The second polishing assembly is arranged perpendicular to the first polishing assembly. The first and the second polishing assemblies are respectively controlled by the pair of magnetic valves to polish one or more workpieces. The present disclosure further discloses a manipulator using the polishing mechanism.

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to polishing mechanisms, and more particularly, to a polishing mechanism for deburring and a manipulator using the polishing mechanism. 
     2. Description of Related Art 
     Burrs on metallic workpieces produced by fabrication process are typically removed manually. An operator polishes the metallic workpiece with a sandpaper to remove the burrs. However, such de-burring polishing process is labor-consuming, the work efficiency is relatively low and the workpiece may be fractured easily. 
     Therefore, there is room for improvement in the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The components in the drawings are not necessarily drawn to scale, the emphasis instead placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an assembled, isometric view of an embodiment of a manipulator having a polishing mechanism. 
         FIG. 2  is a partially assembled, isometric view of the polishing mechanism of the manipulator of  FIG. 1 , the polishing mechanism having a first polishing assembly. 
         FIG. 3  is an exploded, isometric view of the polishing mechanism of  FIG. 2 . 
         FIG. 4  is an exploded, isometric view of the first polishing assembly of the polishing mechanism of  FIG. 2 . 
         FIG. 5  is a cut-away view of the first polishing assembly of  FIG. 4 . 
         FIG. 6  is an assembled, isometric view of the polishing mechanism of  FIG. 2  removing the first polishing assembly and a shielding cover. 
         FIG. 7  shows three working state of the manipulator of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1 and 2  show an embodiment of a manipulator  300  used for removing burrs from a workpiece  200  (see  FIG. 7 ). The manipulator  300  includes an arm  301  having a flange  303 , and a polishing mechanism  100  mounted on the flange  303  of the arm  301 . In the embodiment, as shown in  FIG. 7 , the workpiece  200  is turned over, and includes a curved base wall  201 , a sidewall  203  extending along a periphery of the base wall  201 . A top surface  205  is formed on the sidewall  203  away from the base wall  201 . 
     The polishing mechanism  100  includes a support base  10 , a pair of magnetic valves  20 , a first polishing assembly  30 , a second polishing assembly  50 , an adjusting assembly  70  and a shielding cover  90 . The pair of magnetic valves  20  are received in the support base  10 , and the support base  10  is received in the shielding cover  90 . The first polishing assembly  30  and the second polishing assembly  50  are separately mounted on the support base  10  and partially extended out of the shielding cover  90 . The adjusting assembly  70  extends through the shielding cover  90  and interconnects the arm  301  with the support base  10 . The adjusting assembly  70  is located opposite to the second polishing assembly  50 , and the first polishing assembly  30  extends along a direction perpendicularly to the second polishing assembly  50 . 
     Referring to  FIG. 3 , the support base  10  is substantially a hollow, rectangular structure, which includes a pair of first side walls  11 , a second side wall  13  and a third side wall  15 . The pair of first side walls  11  are spaced from and parallel to each other. The second side wall  13  and the third side wall  15  are spaced from and parallel to each other. The second side wall  13  and the third side wall  15  are perpendicularly connected to opposite ends of the first side wall  11 . The first polishing assembly  30  is mounted on one first side wall  11 . The second polishing assembly  50  is mounted on the third sidewall  15 , and the adjusting assembly  70  is mounted on the second side wall  13 . 
     The pair of magnetic valves  20  are mounted within the support base  10  and electrically connected to the first polishing assembly  30  and the second polishing assembly  50 , respectively. The pair of magnetic valves  20  is also electrically connected to a corresponding electric cabinet of the arm  301  for controlling the first polishing assembly  30  and the second polishing assembly  50 . 
     Referring to  FIGS. 4 and 5 , the first polishing assembly  30  of the embodiment is shown. The first polishing assembly  30  includes a driving member  31 , a dust-proofing member  33 , an eccentric subassembly  35  and a disc sander  37 . The driving member  31  is mounted on one first side wall  11  of the support base  10 . The driving member  31  includes a driving shaft  311  and an outlet nose  313 . In the embodiment, the driving member  31  is an air motor. 
     The dust-proofing member  33  is mounted on the driving member  31 . The dust-proofing member  33  includes a vacuum suction portion  331  and an evacuating portion  333 . The vacuum suction portion  331  is in a hollow basin shape, and sleeved on the driving shaft  311 . The evacuating portion  333  extends outwardly from a side of the vacuum suction portion  331  and connects with an external dust-collection mechanism (not shown). 
     The eccentric subassembly  35  extends through the dust-proofing member  33  and is fastened to the driving shaft  311  of the driving member  31 . The eccentric subassembly  35  includes an eccentric connecting member  351  and a bearing  353 . The eccentric connecting member  351  is fixed to the driving shaft  311  and is partially received in the vacuum suction portion  331  of the dust-proofing member  33 . The eccentric connecting member  351  is in a hollow stepped basin shape, and includes an eccentric portion  3511  and a connecting portion  3513 . The eccentric portion  3511  is coaxially connected to the connecting portion  3513 , and eccentrically defines a mounting groove  3515 . The connecting portion  3513  defines a connecting hole  3517  extending through opposite ends thereof. The connecting hole  3517  is coaxial with the connecting portion  3513  and communicates with the mounting groove  3515 . The connecting portion  3513  is connected to the driving shaft  311 , and the driving shaft  311  is received in the connecting hole  3517 . The bearing  353  is received in the mounting groove  3515 , the outer ring of the bearing  353  is connected to the side wall of the mounting groove  3515 . 
     In the embodiment, the eccentric subassembly  35  further includes a fixing member  357  and a connecting member  359 . The fixing member  357  is in a “T” shape and fixed to an inner ring of the bearing  353 . The fixing member  357  defines a through hole  3571 . The connecting member  359  includes a main portion  3591  and a fixing portion  3593  connected to an end of the main portion  3591 . The fixing portion  3593  is received in the through hole  3571  and fixed to the fixing member  357 . 
     The disc sander  37  is fixed to the connecting member  359 . The disc sander  37  is capable of auto-rotating synchronously when it is rotated by the eccentric subassembly  35 , thus the friction between the disc sander  37  and the workpiece  200  can be adjusted via the self-adaptive auto-rotating of the disc sander  37 . 
     Referring to  FIGS. 5 and 6 , the second polishing assembly  50  is similar to the first polishing assembly  30  in structure. The difference between the two polishing assemblies is that a size of the disc sander  37  of the second polishing assembly  50  is greater than that of the first polishing assembly  30 . 
     The adjusting assembly  70  is mounted on the second side wall  13  of the support base  10 . The adjusting assembly  70  includes a first adjusting member  71 , a second adjusting member  73 , a plurality of guiding rods  75  located between the first adjusting member  71  and the second adjusting member  73 , and a plurality of elastic members  751  sleeved on the plurality of guiding rods  75  respectively. The first adjusting member  71  and the second adjusting member  73  are both in a “C” shape, and facing each other and partially receiving each other. The first adjusting member  71  includes a first connecting portion  711  and a second connecting portion  713  parallel to the first connecting portion  711 . The second adjusting member  73  includes a first mounting portion  731  and a second mounting portion  733  parallel to the first mounting portion  731 . The first connecting portion  711  is fixed to the second side wall  13  of the support base  10 . The first mounting portion  731  is received between the first connecting portion  711  and the second connecting portion  713 , and abuts against the second connecting portion  713 . The second mounting portion  733  is positioned away from the first connecting portion  711 . Each guiding rod  75  is fixed to the first connecting portion  711  by one end thereof, the opposite end of the guiding rod  75  slidably extends through the second connecting portion  713 , the first mounting portion  731  and the second mounting portion  733 . The plurality of elastic members  751  are sleeved on the plurality of guiding rods  75  respectively, and are elastically resisted between the second mounting portion  733  and the second connecting portion  713 . 
     Referring to  FIG. 3  again, the shielding cover  90  is in a hollow square shape. The shielding cover  90  includes a main body  91  and a cover plate  93  assembled to the main body  91 . The main body  91  defines a receiving chamber  910  for receiving the first polishing assembly  30 , the second polishing assembly  50  and the adjusting assembly  70 . The main body  91  includes a pair of first walls  911  and a pair of second walls  913  perpendicular to the pair of first walls  911 . One first wall  911  is smoothly connected to one second wall  913  and defines a first mounting hole  9112  for allowing the first polishing assembly  30  to pass through. The second wall  913  which smoothly connects to the first wall  911  defines a second mounting hole  9132  for allowing the second polishing assembly  50  to pass through. The other second wall  913  defines a connecting hole  9133  for the adjusting assembly  70 . The cover plate  93  is assembled to the main body  91  to seal the receiving chamber  910 . 
     When in assembly, the pair of magnetic valves  20  are mounted in the support base  10  and connected to the electric cabinet of the arm  301 . The first polishing assembly  30  and the second polishing assembly  50  are mounted on the support base  10  and electrically connected to the pair of magnetic valves  20  respectively. The support base  10 , the first polishing assembly  30 , the second polishing assembly  50 , and the pair of magnetic valves  20  are received in the receiving chamber  910  of the main body  91 . The adjusting assembly  70  is fixed to the support base  10  and connected to the arm  301  via the flange  303 . The cover plate  93  seals the receiving chamber  910  to accomplish the assembling of the manipulator  300 . 
     Referring to  FIG. 7 , when in use, the workpiece  200  is fittingly fixed. The manipulator  300  drives the polishing mechanism  100  to move below the workpiece  200 . The first polishing assembly  30  is controlled by one magnetic valve  20  to polish the top surface  205  of the workpiece  200 . When the manipulator  300  drives the polishing mechanism  100  to move toward a periphery of the workpiece  200 , the first polishing assembly  30  polishes an outer surface of the sidewall  203  of the workpiece  200 . When the manipulator  300  drives the polishing mechanism  100  to move above the workpiece  200 , the second polishing assembly  50  polishes an outer surface of the base wall  201  of the workpiece  200 . The burrs that are formed on the top surface  205 , the sidewall  203 , and the base wall  201  of the workpiece  200  are removed by the polishing mechanism  100 . The adjusting assembly  70  can adjust the amount of pressing force of the polishing mechanism  100  on the workpiece  200  when working. 
     When the pressing force exerted on the workpiece  200  is sufficient enough, the adjusting assembly  70  may be omitted. The fixing member  357  and the connecting member  359  may be omitted, and the disc sander  37  can be directly connected to the bearing  353 . 
     Finally, while various embodiments have been described and illustrated, the disclosure is not to be construed as being limited thereto. Various modifications can be made to the embodiments by those skilled in the art without departing from the true spirit and scope of the disclosure as defined by the appended claims.