Rotary driving mechanism and holding device using the same

A rotary driving mechanism includes a support stand, an air feeding assembly, and a driver. The air feeding assembly includes a bearing base, a rotating member, two first ventilating joints, and two second ventilating joints. The bearing base is coupled to the support stand and defines an inner circular surface. The rotating member is rotatably received in the bearing base and resists the inner circular surface. The rotating member defines two circular grooves at an outer periphery thereof and two channels therein. Each circular groove is in fluid communication with one of the channels. The first ventilating joints are coupled to the bearing base and respectively in fluid communication with the circular grooves. The second ventilating joints are coupled to the rotating member and respectively in communication with the channels. The driver is coupled to the rotating member and in communication with the second ventilating joints.

FIELD

The subject matter herein generally relates to holding devices, particularly to a holding device having air tubes and a rotary driving mechanism.

BACKGROUND

When a workpiece is machined, the workpiece can be held by a holding device. The holding device can have a plurality of air tubes to pneumatically drive the workpiece.

DETAILED DESCRIPTION

The present disclosure is in relation to a holding device configured to hold and rotate a workpiece. The holding device can include a support stand, an air feeding assembly, and a holding assembly. The air feeding assembly can include a bearing base, a rotating member, two first ventilating joints, and two second ventilating joints. The bearing base can be coupled to the support stand and define an inner circular surface. The rotating member can be rotatably received in the bearing base and resist the inner circular surface. The rotating member can define two circular grooves at an outer periphery thereof and two channels therein. Each circular groove can be in fluid communication with one of the channels. The first ventilating joints can be coupled to the bearing base and respectively in fluid communication with the circular grooves. The second ventilating joints can be coupled to the rotating member and respectively communicate with the channels. The holding assembly can include a driver and a holding member. The driver can be coupled to the rotating member and communicate with the second ventilating joints. The holding member can be coupled to the driver. The driver can be configured to drive the holding member to move. The rotating member can be configured to rotate the holding member.

The present disclosure is further in relation to a rotary driving mechanism can include a support stand, an air feeding assembly, and at least one driver. The air feeding assembly can include a bearing base, a rotating member, two first ventilating joints, and two second ventilating joints. The bearing base can be coupled to the support stand and defines an inner circular surface. The rotating member can be rotatably received in the bearing base and resist the inner circular surface. The rotating member can define two circular grooves at an outer periphery thereof and two channels therein. Each circular groove can be in fluid communication with one of the channels. The first ventilating joints can be coupled to the bearing base and respectively in fluid communication with the circular grooves. The second ventilating joints can be coupled to the rotating member and respectively communicate with the channels. The at least one driver can be coupled to the rotating member and communicate with the second ventilating joints.

FIG. 1illustrates that an embodiment of a holding device100configured to hold and rotate a workpiece in convenient for processing different surfaces of the workpiece. The holding device100can include a support stand10, an air feeding assembly30, and a holding assembly50. The air feeding assembly30can be mounted on the support stand10. The holding assembly50can be coupled to the air feeding assembly30at an end away from the support stand10. The air feeding assembly30can be configured to transmit gas or air from the support stand10to the holding assembly50, to enable the holding assembly50holding the workpiece.

FIGS. 2 and 3illustrate that the support stand10can include a mounting assembly11, a rotating assembly13, a fixing member15, and a switch17. The mounting assembly11can include a base111, two mounting members113opposite each other, and a coupling rod115. The mounting members113can be mounted on the base111. Each mounting member113can include a main body1131and a protruding portion1133protruding from an end portion of the main body1131. The main body1131can be substantially cuboid shaped. The main bodies1131of the two mounting members113can be positioned face to face. The protruding portions1133can be positioned between the main bodies1131. Each protruding portion1133can define a positioning bevel1130. In the illustrated embodiment, an included angle between the positioning bevel1130and a top of the protruding portion1133can be 135 degrees. Opposite ends of the coupling rod115can be respectively rotatably inserted through the main bodies1131.

The rotating assembly13can include a rotatable member131, a rotating sleeve133, a limiting member135, a coupling member137, a rotation joint138, and a coupling joint139. The rotatable member131can be substantially cylindrical. A first end portion of the rotatable member131can be located between the main bodies1131and rotatably coupled to the coupling rod115. The rotatable member131can rotate about the coupling member115.FIG. 4illustrates that the rotatable member131can define a passage1311along an axis thereof. The first end portion of the rotatable member131can define a first receiving hole1313. The first receiving hole1313can be substantially perpendicular to the passage1311and in fluid communication with the passage1311. The first receiving hole1313can be configured to receive the coupling joint139.

The rotating sleeve133can be substantially hollow and cylindrical. The rotating sleeve133can be sleeved on a second end portion of the rotatable member131opposite the first end portion. The limiting member135can be coupled to the first end of the rotatable member131adjacent to the main body1131. The limiting member135can be configured to limit a rotating angle of the rotatable member131around the coupling rod115.

The coupling member137can be hollow and coupled to the rotating sleeve133. The rotation joint138can be coupled to a second end of the rotatable member131opposite to the first end and in fluid communication with the passage1311. The rotation joint138can be partly received in the coupling member137. The coupling joint139can be inserted into the first receiving hole1313and in fluid communication with the passage1311.

The fixing member15can be L-shaped. The fixing member15can include a fixing portion151and a supporting portion153. The fixing portion151can be substantially a board. The fixing portion151can be mounted on the coupling member137. The supporting portion153can be substantially a board. The supporting portion153can be coupled to an edge of the fixing portion151and substantially perpendicular to the fixing portion151. The supporting portion153can be positioned at a side of the fixing portion151away from the coupling member137.

The switch17can be mounted on the fixing portion151.FIG. 5illustrates that the switch17can include a manual valve171, an air inlet joint173, two air outlet joints175, and two mufflers177. The manual valve171can be coupled to the fixing portion151. The air inlet joint173, the air outlet joints175, and the mufflers177can be coupled to the manual valve171. The air inlet joint173can be positioned between the two mufflers177and in fluid communication with the rotation joint138. The air inlet joint173and the air outlet joints175can be located at opposite sides of the manual valve171. The air inlet joint173can alternatively communicate with either one of the air outlet joints175via the manual valve171. The mufflers177can be configured to decrease a noise when in use.

The air feeding assembly30can be coupled to the supporting portion153. The air feeding assembly30can include a bearing base31, two first ventilating joints32, a rotating member33, two second ventilating joints34, four sealing members35, and an positioning member36. The bearing base31can be coupled to the supporting portion153. The bearing base31can be substantially cylindrical and hollow. The bearing base31can define an inner circular surface311. The bearing base31can define two second receiving holes313(shown inFIG. 4) along a radial direction of the bearing base31. The second receiving holes313can run through the inner circular surface311.

Each first ventilating joint32can be coupled to one of the second receiving holes313and be fluid communication with an inner of the bearing base31. A first end of each first ventilating joint32can be received in the second receiving hole313and seal the second receiving hole313. A second end of each first ventilating joint32can be coupled to one of the air outlet joints175and in fluid communication with the corresponding air outlet joint175.

The rotating member33can be substantially cylindrical and rotatably received in the bearing base31. A first end of the rotating member33can rotatably pass through the bearing base31and resist the inner circular surface311.FIG. 6illustrates that the rotating member33can define two circular grooves331at an outer periphery thereof.

The rotating member33can further define two channels333therein. Each circular groove331can be in fluid communication with one of the channels333and one of the second receiving holes313. Each channel333can include a communicating hole3331, a blowhole3333, and an accepting hole3335. The communicating hole3331can be positioned along a radial direction of the rotating member33and communicate with the corresponding circular groove331. The accepting hole3335can be substantially parallel to the communicating hole3331and run through an outer surface of the rotating member33. The blowhole3333can be in fluid communication with the communicating hole3331and the accepting hole3335and positioned between the communicating hole3331and the accepting hole3335. The blowhole3333can be positioned along a longitudinal direction of the rotating member33.

A second end of the rotating member33opposite the first end can define a plurality of mounting holes335. The mounting holes335can be arranged around the outer surface of the rotating member33and evenly spaced from each other. In the illustrated embodiment, a number of the mounting holes335can be six. An included angle of two adjacent mounting holes335can be substantially 60 degrees. Each second ventilating joint34can be received in one of the accepting holes3335and seal the accepting hole3335. Four sealing members35can be separately sleeved on the rotating member33. Each two of the sealing members35can be positioned at opposite sides of one of the circular grooves331and resist against the inner circular surface311. Thus, each circular groove311is sealed by two sealing members35.

The positioning member36can include a ring361and a latching pin363. The ring361can be sleeved on the second end of the rotating member33away from the bearing base31. The ring361can be coupled to the bearing base31. The ring361can define a plurality of through holes3611. The latching pins363can be respectively detachably received in the through holes3611and inserted into the mounting holes335, to stop a rotation of the rotating member33.

The holding assembly50can include a mounting bracket51, two drivers53, two coupling pipes54, and two holding members55. The mounting bracket51can be coupled to the second end of the rotating member33. The mounting bracket51can be configured to support the workpiece. The mounting bracket51can include a first mounting plate511and a second mounting plate513coupled to the first mounting plate511. The drivers53can be coupled to the first mounting plate511and positioned at a side of the first mounting plate511adjacent to the rotating member33.

Each coupling pipe54can include a flexible tube541and two coupling tubes543in fluid communication with the flexible tube541. The coupling tubes543and the flexible tube541can be coupled to a T-joint. Each flexible tube541can be coupled to one of the second ventilating joints34. The coupling tubes543of one coupling pipe54can be respectively coupled to air inlets of the drivers53. The coupling tubes543of another coupling pipe54can be respectively coupled to air outlets of the drivers53.

Each holding member55can be coupled to one of the drivers53and movably inserted through the first mounting plate511and the second mounting plate513. The drivers53can drive the holding members55to pass through the first mounting plate511and the second mounting plate513to position a workpiece positioned between the first mounting plate511and the second mounting plate513or a workpiece positioned on the second mounting plate513. In the illustrated embodiment, the drivers53are air cylinders.

When in assembly, the mounting members113can be fixed to the base111. The rotatable member131can be positioned between the main bodies1131. The coupling rod115can be inserted into the main bodies1131and the rotatable member131. The rotating sleeve133can be sleeved on the rotatable member131. The rotation joint138can be coupled to the rotatable member131. The coupling member137can be coupled to the rotating sleeve133and the rotation joint138can be received in the coupling member137. The fixing member15can be coupled to the coupling member137. The switch17can be coupled to the fixing portion151. The bearing base31can be coupled to the supporting portion153. The first ventilating joints32can be received in the corresponding second receiving hole313and communicate with the corresponding air outlet joint175.

The rotating member33can be received in the bearing base31and resist the inner circular surface311. The circular groove331can be fluid communication with the corresponding second receiving hole313. The second ventilating joints34can be received in the accepting holes3335. The drivers53can be coupled to the mounting bracket51and the holding members55can be coupled to the drivers53. The mounting bracket51can be coupled to the rotating member33. The coupling tubes543of one coupling pipe54can be respectively coupled to air inlets of the drivers53. The coupling tubes543of another coupling pipe54can be respectively coupled to air outlets of the drivers53.

When in use, the rotatable member131can rotate a determined angle and then the mounting bracket51can be positioned at a needed angle. The limiting member135can limit a movement of the rotatable member131to lock the holding device100. Air from an outer air source can be charged into the air inlet joint173via the coupling joint139, the passage1131, and the rotation joint138. The manual valve171can control the air to enter one of the first ventilating joint32via the corresponding air outlet joint175. The air further can enter into the drivers53via the circular groove331, the channel333, and the second ventilating joint34. Thus, the drivers53can drive the holding member55to hold the workpiece and position the workpiece in a proper position to be machined. When a surface of the workpiece is machined, the latching pins363can be pulled out. The rotating member33can rotate the workpiece in a determined angle. Then, the latching pins363can be inserted into the mounting holes335again, to lock the rotating member33again. Thus, another surface of the workpiece can be machined. When the machining of the workpiece is done, the air source can stop to supply air. The drivers53can recover back to an original state to release the workpiece. Air in the drivers53can be discharged via the second ventilating joint34, the channel333, the first ventilating joint32, and the air outlet joint175.

In at least one embodiment, an included angle between the positioning bevel1130and a top of the protruding portion1133can be not limited to 135 degrees and can be in the range of 90-180 degrees. A number of the mounting holes335can be at least two. A number of the drivers53can be at least two. When there are more than two drivers53, the coupling tubes543can be more than two. The driver53can be not limited to air cylinder. The driver53can be vacuum sucker. The support stand10, the air feeding assembly30, the supporting bracket51, and the drivers53can define a rotary driving mechanism200. The holding members55can be omitted or replaced to other members, such as cutters.