초록 ▼

Pneumatic machining device includes a fixing plate, a hollow piston shell, a piston group, a machining tool, a first sealing group, and a second sealing group. The piston shell is fixed to the fixing plate and coupled to a first external pressure source and second external pressure source to feed ga

Pneumatic machining device includes a fixing plate, a hollow piston shell, a piston group, a machining tool, a first sealing group, and a second sealing group. The piston shell is fixed to the fixing plate and coupled to a first external pressure source and second external pressure source to feed gas into the piston shell to drive the piston group and the machining tool, respectively. The piston group and the first and second sealing groups are received inside the piston shell. The piston group is driven by the first external pressure source to move away from the fixing plate. The first and second sealing groups divide the piston shell into a number of chambers for controlling a gas pressure. The machining tool is coupled to the piston group and extends out of the piston shell to machine a workpiece as the piston group moves away from the fixing plate.

대표청구항 ▼

1. A pneumatic machining device comprising: a piston assembly comprising:a piston shell defining an interior space and having a first end open to the defined interior space and a second end open to the interior space;a fixing plate attached to the first end of the piston shell;a first input valve po

1. A pneumatic machining device comprising: a piston assembly comprising:a piston shell defining an interior space and having a first end open to the defined interior space and a second end open to the interior space;a fixing plate attached to the first end of the piston shell;a first input valve positioned on the piston shell and communicating with the interior space;a second input valve positioned on the piston shell and communicating with the interior space; anda piston group received within, and selectively slidable along, the interior space of the piston shell; anda machining tool comprising:a driving member comprising a first end and a second end, the second end being opposite the first end, the first end of the driving member being coupled to the piston group, and the second end of the driving member extending out from the second end of the piston shell; anda machining element attached to the second end of the driving member and being capable of rotating relative to the driving member;wherein the piston group comprises a hollow cylindrical piston body open at opposite ends thereof, a first protruding flange, a second protruding flange, a third protruding flange, and a fourth protruding flange each flange circumferentially and sequentially protruding from the piston body from a top portion of the piston body to a bottom portion of the piston body;wherein the first protruding flange, the second protruding flange, the third protruding flange, and the fourth protruding flange are spaced unequally from each other; and an outer circumferential surface of the first through fourth protruding flanges resists against an inner surface of the piston shell;wherein the first input valve is coupled to a first external pressure source, and activation of the first external pressure source selectively slides the piston assembly along the interior space of the piston shell to move the machining element towards a workpiece; andwherein, the second input valve is coupled to a second external pressure source, and activation of the second external pressure source selectively rotates the machining element relative to the driving member. 2. The pneumatic machining device as in claim 1, wherein: the pneumatic machining device further comprises a first sealing group and a second sealing group received in the interior space of the piston shell; andthe first sealing group and the second sealing group divide the interior space of the piston shell into a first chamber, a second chamber, and a third chamber. 3. The pneumatic machining device as in claim 1, wherein the fixing plate is configured to fix the pneumatic machining device to a robotic arm. 4. The pneumatic machining device as in claim 2, wherein: the first external pressure source and the second external pressure source are gas sources;the first external pressure source feeds gas into the first chamber of the piston shell to cause the machining tool to move away from the fixing plate; andthe second external pressure source feeds gas into the third chamber of the piston shell to cause the machining element to rotate to machine a surface of the workpiece. 5. The pneumatic machining device as in claim 4, wherein the piston shell further comprises: a cylindrical main body; anda fixing flange circumferentially protruding from one end portion of the main body, the fixing flange configured to fix the piston shell to the fixing plate;wherein a diameter of the fixing flange is greater than a diameter of the main body;wherein the first input valve protrudes from a side of the fixing flange; andwherein the second input valve protrudes from a side of the main body. 6. The pneumatic machining device as in claim 5, wherein: a plurality of first gas holes is defined in the main body of the piston shell; andexcess gas fed into the second chamber of the piston shell is released through the plurality of first gas holes. 7. The pneumatic machining device as in claim 6, wherein: a plurality of second gas holes is defined circumferentially in the piston body between the first and second protruding flanges;a plurality of third gas holes is defined in a bottom surface of the piston body;each of the plurality of third gas holes is connected to at least one of the plurality of second gas holes by a gas channel; andexcess gas from the third chamber is released out of the piston shell by flowing through the plurality of third gas holes, the gas channels, the plurality of second gas holes, and the plurality of first gas holes in sequence. 8. The pneumatic machining device as in claim 7, wherein: an elongated limiting slot is defined in a side of the main body of the piston shell, the limiting slot extending lengthwise along the main body;a limiting hole is defined in a side of the piston body between the first and second protruding flanges;the piston group received inside the piston shell has the limiting hole aligned with the limiting slot;a limiting member is received in the limiting slot and the limiting hole to limit movement of the piston group inside the piston shell and to prevent the piston group from rotating in the piston shell; anda hole cover is covered on the piston shell and over the limiting slot to prevent air from entering into the second chamber and prevent gas from exiting the second chamber. 9. The pneumatic machining device as in claim 7, wherein: an end of the fixing flange forms a depressed surface surrounding an opening of the piston shell;the first sealing group comprises a first sealing cover, a first sealing ring, a first oil seal, a sealing disk, and a first cushion pad;the first sealing cover comprises a first cover portion and a second cover portion, the second cover portion extending from a middle portion of the first cover portion;the first cover portion is supported on the depressed surface of the fixing flange, and the second cover portion protrudes into the piston shell;the first sealing ring is sleeved on the second cover portion and resists against an inner circumferential surface of the fixing flange;the first oil seal is sleeved on the top portion of the piston body and supported on the first protruding flange, the first oil seal resisting against the inner circumferential surface of the fixing flange;the sealing disk is located on the top portion of the piston body and is configured to hold the first oil seal in place on the first protruding flange;the first cushion pad is located between the second cover portion and the sealing disk, and a predetermined space is defined between an outer circumferential surface of the first cushion pad and the inner circumferential surface of the piston shell; andthe first chamber is cooperatively defined by the first sealing ring, the first oil seal, and the inner circumferential surface of the piston shell. 10. The pneumatic machining device as in claim 9, wherein the first chamber is sealed by the first sealing ring and the first oil seal; the pressure of the first chamber is increased by the gas fed therein from the first external pressure source to move the piston group away from the fixing plate; the first external pressure source is turned off when the piston group is moved to an appropriate position for the machining tool to machine the surface of the workpiece; and the piston group is held in place by the gas sealed in the first chamber. 11. The pneumatic machining device as in claim 9, wherein: the second sealing group comprises a second sealing ring, a guiding ring, a second sealing cover, a second oil seal, a limiting ring, and a second cushion pad;the second sealing ring is sleeved on the piston body and located between the second and third protruding flanges;the guiding ring is sleeved on the piston body and located between the third and fourth protruding flanges;the second sealing cover is hollow ring shaped and fixed to an end of the piston shell opposite from the fixing plate;the second oil seal is located on the second sealing cover and received inside the piston shell, and an outer circumferential surface of the second oil seal resists against the inner circumferential surface of the piston shell;the limiting ring is located on the second oil seal and received inside the piston shell;the piston shell forms a dividing ridge protruding circumferentially from the inner surface of the main body, and the second cushion pad is supported on the dividing ridge;the second cushion pad is configured to cushion the piston group against the dividing ridge;the second chamber is cooperatively defined by the first oil seal, the second sealing ring, and the inner circumferential surface of the piston shell; andthe third chamber is cooperatively defined by the second sealing ring, the second oil seal, and the inner circumferential surface of the piston shell. 12. The pneumatic machining device as in claim 11, wherein: the second chamber is in spatial communication with the plurality of first gas holes and the plurality of second gas holes;the gas fed into the third chamber by the second external pressure source passes through the third chamber into the machining tool to drive the machining tool to rotate to machine the surface of the workpiece;excess gas fed into the third chamber is released outside of the piston shell by passing through the plurality of second gas holes of the piston body into the second chamber, and then passing through the plurality of first gas holes of the piston shell. 13. The pneumatic machining device as in claim 1, wherein: the pneumatic machining device further comprises a coupling member to couple the machining tool to the piston group;the coupling member comprises a coupling head and a coupling body protruding from one side of the coupling head;a diameter of the coupling head is greater than a diameter of the coupling body;the piston group forms a connecting ridge circumferentially protruding from an inner circumferential surface of the piston body;the coupling member received in the piston body is held in place by the coupling head resisting against the connecting ridge, and the coupling body is inserted into the machining tool to couple the machining tool to the piston group. 14. The pneumatic machining device as in claim 12, wherein: the first end of the driving member is received through the second sealing cover, the second oil seal, and the limiting ring in sequence;the first end of the driving member defines an annular exhaust groove;the driving member forms a connecting post located inside the exhaust groove;the coupling body of the coupling member inserts into the connecting post to couple the driving member to the piston group;the exhaust groove aligns with the plurality of third gas holes;a gas input hole is defined in a sidewall of the driving member to guide the gas fed into the third chamber into the driving member;the gas input hole is connected to the exhaust groove by an exhaust channel; andexcess gas fed into the driving member is released outside of the piston shell by passing from the exhaust channel through the exhaust groove, the plurality of third gas holes, the plurality of second gas holes, the second chamber, and the plurality of first gas holes in sequence. 15. A pneumatic machining device comprising: a piston assembly comprising:a piston shell defining an interior space and having a first end open to the defined interior space and a second end open to the interior space;a fixing plate attached to the first end of the piston shell;a first input valve positioned on the piston shell and communicating with the interior space;a second input valve positioned on the piston shell and communicating with the interior space; anda piston group received within, and selectively slidable along, the interior space of the piston shell;a machining tool comprising:a driving member comprising a first end and a second end, the second end being opposite the first end, the first end of the driving member being coupled to the piston group, and the second end of the driving member extending out from the second end of the piston shell; anda machining element attached to the second end of the driving member and being capable of rotating relative to the driving member; anda coupling member comprising a coupling head and a coupling body protruding from one side of the coupling head, a diameter of the coupling head being greater than a diameter of the coupling body;wherein the piston group forms a connecting ridge circumferentially protruding from an inner circumferential surface of the piston group; the coupling member received in the piston group is held in place by the coupling head resisting against the connecting ridge, and the coupling body is inserted into the machining tool to couple the machining tool to the piston group;wherein the first input valve is coupled to a first external pressure source, and activation of the first external pressure source selectively slides the piston assembly along the interior space of the piston shell to move the machining element towards a workpiece; andwherein, the second input valve is coupled to a second external pressure source, and activation of the second external pressure source selectively rotates the machining element relative to the driving member. 16. The pneumatic machining device as in claim 15, wherein: the pneumatic machining device further comprises a first sealing group and a second sealing group received in the interior space of the piston shell; andthe first sealing group and the second sealing group divide the interior space of the piston shell into a first chamber, a second chamber, and a third chamber. 17. The pneumatic machining device as in claim 16, wherein: the first external pressure source and the second external pressure source are gas sources;the first external pressure source feeds gas into the first chamber of the piston shell to cause the machining tool to move away from the fixing plate; andthe second external pressure source feeds gas into the third chamber of the piston shell to cause the machining element to rotate to machine a surface of the workpiece. 18. The pneumatic machining device as in claim 17, wherein the piston shell further comprises: a cylindrical main body; anda fixing flange circumferentially protruding from one end portion of the main body, the fixing flange configured to fix the piston shell to the fixing plate;wherein a diameter of the fixing flange is greater than a diameter of the main body;wherein the first input valve protrudes from a side of the fixing flange; andwherein the second input valve protrudes from a side of the main body.