CN113400191A

CN113400191A - Rubbing head and automatic burnishing machine

Info

Publication number: CN113400191A
Application number: CN202110727871.3A
Authority: CN
Inventors: 何映华; 柯军辉; 吴聪; 刘欢; 李金开
Original assignee: TCL King Electrical Appliances Huizhou Co Ltd
Current assignee: TCL King Electrical Appliances Huizhou Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-17

Abstract

The invention discloses a polishing head and an automatic polishing machine, which comprises a rotating shaft with a rotating center line and a rotating surface vertical to the rotating center line, an eccentric bearing with a central axis, a fixed pad connected with the second end of the eccentric bearing, and a polishing sheet positioned on the surface of the fixed pad on the side far away from the eccentric bearing, wherein the eccentric bearing is provided with a first end connected with the rotating surface and a second end far away from the rotating surface, and the central axis is staggered with the rotating center line. The polishing head can automatically polish the surface of the workpiece by controlling the rotation of the rotating shaft, and the polishing sheet connected with the rotating shaft generates micro translation motion in the rotating process of the eccentric bearing because the rotating center line of the rotating shaft is staggered with the central axis of the eccentric bearing, so that the translation polishing of the surface of the workpiece is realized.

Description

Rubbing head and automatic burnishing machine

Technical Field

The invention relates to the technical field of workpiece surface processing, in particular to a polishing head and an automatic polishing machine.

Background

Due to the complexity and diversity of the die workpiece and the characteristics of nonstandard parts processed by single parts, the die polishing process in the industry is pure manual polishing, the manual polishing occupies a large amount of manpower, the physical abilities of workers are consumed for a long time, along with the progress and development of times, the automatic production technology is different day by day, the occupation of polishing workers is gradually not met by young people, the trend that the labor is difficult to recruit and the polishing technology is lack of the inheritance of the young people appears in recent years, and according to the development trend, the polishing workers are seriously lost in 2031 year in the future, and the polishing cost of the die is inevitably increased continuously. It is imperative to achieve automated polishing of the mold.

The precondition that the existing liquid crystal display television die polishing technology can realize automation is to develop automatic polishing equipment, and replace part of manual polishing work with an automatic polishing machine, so that the working strength of workers is reduced.

Disclosure of Invention

The invention provides a polishing head and an automatic polishing machine, and aims to realize automatic polishing of the surface of a workpiece, and the surface of the workpiece cannot be damaged by polishing treatment.

In one aspect, the present invention provides a polishing head comprising:

a rotating shaft having a rotation center line and a rotating surface perpendicular to the rotation center line;

an eccentric bearing having a first end connected to the rotating surface and a second end remote from the rotating surface, the eccentric shaft having a central axis, and the central axis being offset from the center line of rotation;

a fixed pad connected with the second end of the eccentric bearing;

and the polishing sheet is positioned on the surface of one side of the fixed pad far away from the eccentric bearing.

Further preferably, the method further comprises the following steps:

the linkage shaft is connected with the rotating shaft;

and the rotary driving mechanism is connected with the linkage shaft.

Further preferably, the rotary drive mechanism includes:

the impeller is connected with the linkage shaft;

and a cylinder case surrounding the impeller and having an air inlet and an air outlet.

Further preferably, the rotating surface of the rotating shaft is elliptical or circular, and the eccentric bearing is located at an edge of the rotating surface.

Further preferably, the fixing pad includes one of a circular shape and a square shape.

Further preferably, when the fixing pad is square, the polishing head further includes:

a translational motion plate located between the eccentric bearing and the fixed pad;

the protecting cover surrounds the linkage shaft, and is provided with a mounting plate on one side far away from the rotating surface, and the middle of the mounting plate is provided with an opening for accommodating the linkage shaft;

the flexible limiting column is provided with a third end connected with the mounting plate and a fourth end connected with the translational motion plate.

Further preferably, the dislocation distance between the central axis and the rotation central line is 0.5-2 mm.

In another aspect, the present invention provides an automatic polishing machine comprising:

the polishing head of any one of the above;

the flexible shaft is perpendicular to the polishing sheet and is connected with the polishing head;

the supporting frame is connected with the flexible shaft;

and the lifting device is connected with the support frame, and the support frame is positioned between the flexible shaft and the lifting device.

Further preferably, the method further comprises the following steps:

the workbench is positioned below the polishing head;

the two first guide rails are positioned on the workbench and are parallel to each other;

the second guide rail is positioned on the two first guide rails, two sliding grooves are respectively arranged below two ends of the second guide rail, one sliding groove is connected with one first guide rail in a sliding manner, and the lifting device is slidably mounted on the second guide rail.

Further preferably, the method further comprises the following steps:

the computer host is positioned below the workbench;

and the control panel is connected with the computer host.

The invention has the beneficial effects that: a polishing head and an automatic polishing machine are provided, which includes a rotating shaft having a rotation center line and a rotation surface perpendicular to the rotation center line, an eccentric bearing having a center axis, the eccentric bearing having a first end connected to the rotation surface and a second end remote from the rotation surface, and the center axis being misaligned with the rotation center line, a fixing pad connected to the second end of the eccentric bearing, and a polishing sheet located on a surface of the fixing pad on a side remote from the eccentric bearing. The polishing head can automatically polish the surface of the workpiece by controlling the rotation of the rotating shaft, and the polishing sheet connected with the rotating shaft generates micro translation motion in the rotating process of the eccentric bearing because the rotating center line of the rotating shaft is staggered with the central axis of the eccentric bearing, so that the translation polishing of the surface of the workpiece is realized.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

FIG. 1a is a schematic diagram illustrating an overall configuration of a polishing head according to a first embodiment of the present invention;

FIG. 1b is a schematic diagram illustrating the internal structure of a polishing head according to a first embodiment of the present invention;

FIG. 1c is a schematic view of a part of the structure of a polishing head according to a first embodiment of the present invention;

FIG. 2a is a schematic diagram illustrating an overall structure of a polishing head according to a second embodiment of the present invention

FIG. 2b is a schematic view of a part of the structure of a polishing head according to a second embodiment of the present invention;

FIG. 2c is a schematic view showing a first mounting structure of a flexible retaining post in a polishing head according to a second embodiment of the present invention;

FIG. 2d is a schematic diagram of a second mounting structure of a flexible retaining post in a polishing head according to a second embodiment of the present invention;

FIG. 3 is a schematic diagram of the moving track of the eccentric bearing and the translational motion block provided by the second embodiment of the present invention;

FIG. 4a is a schematic structural diagram of an automatic polishing machine according to a third embodiment of the present invention;

FIG. 4b is a schematic view of a partially enlarged structure of an automatic polishing machine according to a third embodiment of the present invention;

fig. 5 is a schematic structural diagram of an automatic polishing machine according to a fourth embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1a to 1c, fig. 1a is a schematic diagram illustrating an overall structure of a polishing head according to a first embodiment of the present invention, fig. 1b is a schematic diagram illustrating an internal structure of the polishing head according to the first embodiment of the present invention, and fig. 1c is a schematic diagram illustrating a partial structure of the polishing head according to the first embodiment of the present invention. The polishing head 10 provided in this embodiment can be applied to a television set. The polishing head 10 comprises a rotary driving mechanism (comprising a cylinder box 11 and an impeller 12), a linkage shaft 13, a rotating shaft 14, a fixed pad 15, a polishing sheet 16 and an eccentric bearing 17. The cylinder box 11 has an air inlet 111 and an air outlet 112, the cylinder box 11 surrounds the impeller 12, the impeller 12 is connected with the linking shaft 13, and the linking shaft 13 is connected with the rotating shaft 14. In this embodiment, air can be introduced through the air inlet 111 of the cylinder box 11 and discharged through the air outlet 112, the movement of the air flow drives the rotation of the impeller 12, and the rotation of the impeller 12 drives the linking shaft 13 and the rotating shaft 14 to rotate. It is to be understood that the rotation driving mechanism for controlling the rotation of the rotary shaft 14 may be any other structure, and it is not necessary that the present embodiment provides the control of the rotation of the rotary shaft 14 by the cylinder housing 11 and the impeller 12.

The rotating shaft 14 has a rotating center line 141 and a rotating surface 142 perpendicular to the rotating center line 141, the fixing pad 15 is used for fixing the polishing sheet 16, the eccentric bearing 17 is perpendicular to the rotating surface 142 and has a central axis 171, the eccentric bearing 17 has a first end 172 connected to the rotating surface 142 and a second end 173 far away from the rotating surface 142, the central axis 171 is parallel to the rotating center line 141 and is offset by a small distance, and the offset distance can be 0.5-2 mm, preferably 1 mm.

Wherein the rotating surface 142 of the rotating shaft 14 may be elliptical or circular. Preferably, the eccentric bearing 17 is located at the edge of the rotating surface 142, and the distance between the central axis 171 and the rotating centerline 141 is approximately equal to the distance between the edge of the rotating surface 142 and the rotating centerline 141.

The fixed pad 15 is connected to the second end 173 of the eccentric bearing 17, and specifically, the side of the fixed pad 15 close to the eccentric bearing 17 may have an opening, and the opening is connected to the eccentric bearing 17 to connect the fixed pad 15 to the eccentric bearing 17. Preferably, the eccentric bearing 17 is attached at the center of the fixed pad 15, i.e., the central axis 171 of the eccentric bearing 17 coincides with the center line of the fixed pad 15. In this embodiment, the fixed pad 15 and the eccentric bearing 17 may be fixedly connected or movably connected. In some embodiments, the fixed pad 15 may be coupled to the eccentric bearing 17 in other ways. The polishing sheet 16 is located on the surface of the fixing pad 15 on the side away from the eccentric bearing 17, and the polishing sheet 16 may be a sand paper sheet or other polishing material. The fixing pad 15 is circular, and the polishing sheet 16 is also circular, so that the polishing head 10 can polish and polish workpieces with round corners.

In this embodiment, the central axis 171 is offset from the rotation central axis 141 by a small distance (e.g. 1mm), the motion track of the fixed pad 15 is the same as the motion track of the eccentric bearing 17, and the fixed pad 15 rotates along with the eccentric bearing 17, so that the eccentric bearing 17 can make the polishing sheet 16 perform a small translational motion during the rotation process, and can also make the polishing sheet 16 rotate, thereby performing translational polishing and rotational polishing on the surface of the workpiece.

Preferably, when the rotating surface 142 has an elliptical shape, since the movement locus of the eccentric bearing 17 has an elliptical shape and the force applied to the opening of the fixed pad 15 is not uniform during the movement, the fixed pad 15 may be shaken, and the shaking may improve the polishing performance of the polishing sheet 16.

Optionally, in order to prevent the polishing sheet 16 from scratching the surface of the workpiece due to rotation, the polishing sheet 16 of a sand paper type may not be used when polishing the glass surface, and some flexible polishing material may be used to reduce the damage to the surface of the workpiece due to rotation.

The polishing head 10 according to the first embodiment of the present invention can automatically polish the surface of the workpiece by the polishing head 10 by controlling the rotation of the rotating shaft 14, and since the rotation center line 141 of the rotating shaft 14 is offset from the center axis 171 of the eccentric bearing 17, the rotation of the eccentric bearing 17 can cause the polishing sheet 16 to perform translational motion and rotational motion to polish the surface of the workpiece. The grinding mode using the micro translation motion is novel, and the damage to the surface of the workpiece can be reduced.

Referring to fig. 2a to 2c, fig. 2a is a schematic diagram illustrating an overall structure of a polishing head according to a second embodiment of the present invention, fig. 2b is a schematic diagram illustrating a partial structure of the polishing head according to the second embodiment of the present invention, fig. 2c is a schematic diagram illustrating a first mounting structure of a flexible spacing column in the polishing head according to the second embodiment of the present invention, and fig. 2d is a schematic diagram illustrating a second mounting structure of the flexible spacing column in the polishing head according to the second embodiment of the present invention. When the polishing head 20 is placed upright, the polishing head 20 includes, from top to bottom, a rotation driving mechanism (including the cylinder housing 21 and the impeller 22), a linking shaft 23 connected to the impeller 22, a rotation shaft 24 connected to the linking shaft 23, an eccentric bearing (not shown in the figure) connected to the rotation shaft 24, a fixed pad 25 connected to the eccentric bearing, and a polishing pad 26 connected to the fixed pad 25. The fixing pad 25 is square, and the polishing sheet 26 is also square, so that the polishing head 20 can polish and polish a workpiece with square corners.

In this embodiment, the eccentric bearing has the same structure as the eccentric bearing 17 of the first embodiment, the rotating shaft 24 has a rotating center line and a rotating surface 241 perpendicular to the rotating center line, and the eccentric bearing is perpendicular to the rotating surface 241 and has a central axis which is parallel to the rotating center line and is displaced by a small distance, so that the translational movement of the polishing pad 26 can be realized.

In this embodiment, the polishing head 20 further includes a translational motion block 27 located between the eccentric bearing and the fixed pad 25, and a protective cover 28 surrounding the linkage shaft 23. The translational motion block 27 has a hole 271 in the center thereof, and an eccentric bearing is inserted into the hole 271 of the translational motion block 27 so that the eccentric bearing is coupled to the translational motion block 27. The cover 28 has a mounting plate 281 on the side remote from the rotating surface 241, and the mounting plate 281 has an opening 282 in the middle thereof for accommodating the interlocking shaft 23. The polishing head 20 further comprises a flexible limiting column 29, the protective cover 28 surrounds the linkage shaft 23 and the flexible limiting column 29, and the flexible limiting column 29 is located between the protective cover 28 and the linkage shaft 23. The flexible restraint posts 29 have a third end connected to the mounting plate 281 and a fourth end connected to the translational motion plate 27. Wherein, the relative both sides of interlock axle 23 of flexible spacing post 29 have 3 respectively, and the third end of 3 flexible spacing posts 29 is connected with first backup pad 291, and the fourth end of 3 flexible spacing posts 29 is connected with second backup pad 292, and two first backup pads 291 can be through the screw mounting on the mounting panel 281, and two second backup pads 292 can be through the screw mounting on translational motion board 27. Wherein, the translational motion block 27 is limited by the flexible limit column 29 and can not rotate.

Referring to fig. 3, fig. 3 is a schematic diagram of a moving track of an eccentric bearing and a translational motion block according to a second embodiment of the present invention. The eccentric bearing 242 is located at the edge of the rotating shaft 24, and when the rotating surface 241 of the rotating shaft 24 is circular, the motion track of the eccentric bearing 242 is also circular; when the rotating surface 241 of the rotating shaft 24 has an elliptical shape, the motion locus of the eccentric bearing 242 also has an elliptical shape. Because the flexible limiting column 29 is flexible, the movement of the eccentric bearing 242 can drive the translational motion block 27 to move in a plane. The four corners of the translational motion block 27 are represented by 4 circles in the figure, and 3a is the position of the eccentric bearing 242 and the translational motion block 27 when the eccentric bearing 242 is at 0 °; 3b is the position of the eccentric bearing 242 and the translational motion block 27 when the eccentric bearing 242 is at 90 °; 3c is the position of the eccentric bearing 242 and the translational motion block 27 when the eccentric bearing 242 is at 180 °; 3d is the position of eccentric bearing 242 and translational motion block 27 when eccentric bearing 242 is at 270.

In the embodiment, the rotational motion of the rotating shaft 24 is changed into the translational motion of the translational motion block 27, so that the polishing sheet 26 performs the translational motion, and further performs polishing and grinding on the surface of the workpiece.

The polishing head 20 provided by the second embodiment of the present invention can automatically polish the surface of the workpiece by the polishing head 20 by controlling the rotation of the rotating shaft 24, and because the rotation center line of the rotating shaft 24 is misaligned with the center axis of the eccentric bearing 242, the rotation of the eccentric bearing 24 can make the polishing sheet 26 perform a translational motion, so as to achieve translational polishing of the surface of the workpiece. The grinding mode using the micro translation motion is novel, and the damage to the surface of the workpiece can be reduced.

Referring to fig. 4a to 4b, fig. 4a is a schematic structural diagram of an automatic polishing machine according to a third embodiment of the present invention, and fig. 4b is a schematic partial enlarged structural diagram of the automatic polishing machine according to the third embodiment of the present invention. The automatic polishing machine 100 includes a polishing head 101, the polishing head 101 may be the polishing head 10 or the polishing head 20 provided in the above embodiment, and the polishing head 101 includes a polishing sheet 1011 at the bottom. The automatic polishing machine 100 further comprises a flexible shaft 102 perpendicular to the polishing sheet 1011 and connected to the polishing head 101, a support frame 102 connected to the flexible shaft 102, and a lifting device 104 connected to the support frame 103. The support frame 103 is located between the flexible shaft 102 and the lifting device 104. The flexible shaft 102 may relieve a force between the polishing head 101 and the workpiece surface when the polishing head 101 performs polishing to prevent damage to the workpiece surface. The lifting device 104 can control the polishing head 101 to move up and down for different heights of the workpiece surface.

The automatic polishing machine 100 further comprises a worktable 105 positioned below the polishing head 101, two first guide rails 106 positioned on the worktable 105 and parallel to each other, and second guide rails 107 positioned on the two first guide rails 106, wherein two sliding grooves 1071 are respectively arranged below two ends of the second guide rails 107, and one sliding groove 1071 is slidably connected with one first guide rail 106, so that the second guide rail 107 can slide on the two first guide rails 106. The lifting device 104 has a mounting slot 1041, and the mounting slot 1041 is mounted on the second guide rail 107, so that the lifting device 104 can move along the second guide rail 107.

The automatic polishing machine 100 further includes a host computer (not shown) located below the worktable, and a control panel 108 connected to the host computer. The automatic polisher 100 imports an autocom drawing file with newly developed software, calculates a trajectory from a shape selection plane of a mold or a workpiece, and then generates trajectory coordinates. The track coordinates of the polishing head 101 can be displayed on the control panel 108, and the movement of the second guide rail 107 on the first guide rail 106 and the movement of the lifting device 104 on the second guide rail 107 can be controlled by the track coordinates, so that the polishing head reaches the specified coordinates, that is, the second guide rail 107 moves in the X direction, the lifting device 104 moves in the Y direction, and the polishing head rubs and moves in parallel at the speed V of 1000mm/min according to the track. In addition, the lifting device 104 can control the polishing head 101 to move in the Z direction, so that the polishing head 101 can avoid an obstacle on the surface of the workpiece (a structure that does not need polishing).

Referring to fig. 5, fig. 5 is a schematic structural diagram of an automatic polishing machine according to a fourth embodiment of the present invention. The automatic polishing machine 200 comprises a polishing head 201, the polishing head 201 can be the polishing head 10 or the polishing head 20 provided in the above embodiment, and the polishing head 201 comprises a polishing sheet at the bottom. The automatic polishing machine 100 further comprises a flexible shaft 202 perpendicular to the polishing sheet and connected to the polishing head 201, a pneumatic motor 203 connected to the flexible shaft 202, and a lifting device 204 connected to the pneumatic motor 203. The pneumatic motor 203 is located between the flexible shaft 102 and the lifting device 104 and above the flexible shaft 202. The pneumatic motor 203 controls the force applied by the flexible shaft 202 to the polishing head 201 by controlling the air pressure, and when the depth of polishing the surface of the workpiece is large, the air pressure of the pneumatic motor 203 can be increased; when only a slight grinding of the surface of the workpiece is required, the air pressure of the air motor 203 can be reduced.

The automatic polishing machine 200 provided by the fourth embodiment of the present invention can precisely control the polishing degree of the polishing head 201 by controlling the air pressure of the air motor 203, and the flexible shaft 202 can slow down the force between the polishing head 201 and the workpiece surface to prevent the workpiece surface from being damaged.

The automatic polishing machine 100 and the automatic polishing machine 200 provided by the embodiment of the invention have large stroke and large polishing area, and can set the track of the polishing head according to the shape of the workpiece, so that the automatic polishing machine 100 and the automatic polishing machine 200 can be applied to various different dies or workpieces.

Claims

1. A polishing head, comprising:

a fixed pad connected with the second end of the eccentric bearing;

2. The polishing head as set forth in claim 1 further comprising:

the linkage shaft is connected with the rotating shaft;

and the rotary driving mechanism is connected with the linkage shaft.

3. The polishing head as set forth in claim 2 wherein the rotational drive mechanism comprises:

the impeller is connected with the linkage shaft;

4. The polishing head as set forth in claim 1 wherein the rotating surface of the rotating shaft is elliptical or circular and the eccentric bearing is located at an edge of the rotating surface.

5. The polishing head as set forth in claim 2 wherein the fixed pad comprises one of a circular shape and a square shape.

6. The polishing head as set forth in claim 5 wherein when the fixed pad is square, the polishing head further comprises:

7. The polishing head as set forth in claim 1 wherein the center axis is displaced from the center axis of rotation by a distance of 0.5 to 2 mm.

8. An automatic polishing machine, comprising:

a polishing head according to any one of claims 1 to 7;

the supporting frame is connected with the flexible shaft;

9. The automatic polishing machine of claim 8, further comprising:

the workbench is positioned below the polishing head;

10. The automatic polishing machine of claim 9, further comprising:

the computer host is positioned below the workbench;

and the control panel is connected with the computer host.