Motion control mechanism of a workpiece clamping assembly for a polishing machine

Abstract

The present invention relates to a motion control mechanism for a workpiece clamping assembly for a polishing machine, comprising a clamping assembly, a combined bearing, and a power mechanism; the combined bearing comprises a slewing bearing with inner and outer gear rings, a planetary driving gear and a planetary driven gear on a planetary support disposed within the inner gear ring, an umbrella-shaped driving gear disposed on the planetary support meshing with the umbrella-shaped driven gear on a spline shaft in the clamping assembly to achieve a change in motion direction, the spline shaft driving the upper and lower workpiece rotating shafts of the upper and lower clamps to rotate synchronously, the upper and lower clamps respectively being provided with first and second racks parallel and in opposite directions, the two racks meshing with the same gear, the movement of the first rack driving the gear to rotate, and thereby driving the second rack to move toward the first rack, thereby achieving clamping of the upper and lower clamps. Compared to the prior art, the present invention has a simple and compact structure, a small size, high precision, and good synchronization.

Description

Technical Field

[0001] The invention relates to equipment for polishing, in particular to a motion control mechanism of a workpiece clamping assembly for a polishing machine. Background Art

[0002] During the processing and forming of thermos cups or kettles, they need to go through multiple processes such as tube cutting, mouth rolling, water swelling, splitting, necking, edge flanging, polishing, and painting. Among them, polishing, as one of the last processes of thermos cup forming, has a great impact on the appearance and use effect of the product.

[0003] In the past, polishing machines used for thermos cups typically used a clamping mechanism that simply clamped the workpiece against the cup's ends using two clamping plates before processing. However, because the polishing wheel worked from the side of the cup, the workpiece was subjected to not only the pressure from the clamping plates but also the squeeze from the polishing wheel. Over time, this could cause the workpiece to shift away from the polishing wheel. This made it impossible to maintain perfect coaxiality between the workpiece axis and the spindle when switching between different processing positions, ultimately affecting product accuracy.

[0004] Chinese utility model patent CN 211728728 U "A motion control mechanism of a workpiece clamping assembly for a polishing machine" discloses a motion control mechanism of a workpiece clamping assembly for a polishing machine, which includes a workpiece clamping assembly; one end of a rotating shaft is connected to the workpiece clamping assembly and the other end is connected to a gear, and the gear is driven by a rack meshing, thereby forming a rotating shaft rotation mechanism of the workpiece clamping assembly; the rotating shaft rotation mechanism of the workpiece clamping assembly also has an X-axis movable plate, which is connected to an X-axis motion block connected to a synchronous belt provided on an X-axis fixed plate, and the synchronous belt is driven by a driving component, thereby forming an X-axis motion mechanism of the workpiece clamping assembly; the workpiece clamping assembly includes a workpiece clamping and fixing plate, the lower end of the workpiece clamping and fixing plate is connected to a lower fixed plate, the lower fixed plate has a rotating seat connected and driven by a workpiece rotation driving motor, and the upper end of the workpiece clamping and fixing plate is slidably connected to an upper fixed plate; the upper fixed plate is L-shaped, and the upper fixed plate has a part parallel to and a part perpendicular to the workpiece clamping and fixing plate that are connected to each other, and a clamping mold is provided below the part perpendicular to the workpiece clamping and fixing plate.

[0005] This motion control mechanism can realize the motion adjustment of the workpiece clamping component of the polishing machine on the X-axis and Y-axis (rotation axis); compared with the original operator's hand-held method, its operation stability and safety have advantages. Compared with the original clamping component with adjustable position, this motion control mechanism is relatively stable and efficient, especially the addition of motion adjustment of the Y-axis (rotation axis) position, which is suitable for polishing operations. After use, the quality of workpiece polishing operations can be improved.

[0006] However, the Y-axis (rotational axis) is complex in structure. Rotation of the Y-axis (rotational axis) is achieved through the control of a gear and rack. The stability of the meshing between the gear and rack determines the stability and accuracy of the entire motion control mechanism. Although the motion control mechanism disclosed in this utility model uses a meshing adjustment cylinder to adjust the meshing stability of the gear and rack, the complex structure of this motion control mechanism cannot maintain long-term stability. Numerous auxiliary facilities must be added to achieve synchronization between the various mechanisms, resulting in a complex and bulky motion control mechanism. Summary of the Invention

[0007] The present invention provides a motion control mechanism for a workpiece clamping assembly for a polishing machine, addressing the shortcomings of prior art systems such as poor synchronization, complex structure, and bulky overall motion control mechanisms. The present invention utilizes a combined internal and external gear ring bearing, which not only makes the rotation of the workpiece clamping assembly more compact and maximizes transmission power, but also achieves high rigidity, compact size, and multifunctionality throughout the entire design.

[0008] To achieve the above object, the technical solution of the present invention is:

[0009] A motion control mechanism for a workpiece clamping assembly for a polishing machine, comprising a clamping assembly, a combined bearing, and a power mechanism;

[0010] The combined bearing includes a slewing bearing provided with an inner gear ring and an outer gear ring, and a planetary driving gear and a planetary driven gear provided on a planetary carrier within the inner gear ring, the planetary driving gear meshing with the planetary driven gear, the planetary driven gear meshing with the inner gear ring, and an umbrella-shaped driving gear provided on the planetary carrier;

[0011] The power mechanism includes a first drive motor and a second drive motor, the output shaft of the first drive motor is connected to the main drive gear, the main drive gear is meshed with the outer ring gear, and the output shaft of the second drive motor is connected to the planetary driving gear;

[0012] The clamping assembly includes a bracket and a retractable driving shaft, and the bracket is connected to the outer gear ring; an upper clamp and a lower clamp that can slide relative to each other are respectively provided at both ends of the bracket, the upper clamp is provided with an upper workpiece rotating shaft, and the lower clamp is provided with a lower workpiece rotating shaft; the retractable driving shaft is provided with an umbrella-shaped passive gear, and the umbrella-shaped active gear is engaged with the umbrella-shaped passive gear to drive the umbrella-shaped passive gear to rotate, and then drive the retractable driving shaft to rotate, and the retractable driving shaft drives the upper workpiece rotating shaft and the lower workpiece rotating shaft to rotate synchronously respectively; the bracket is provided with a sliding device that drives the upper clamp and the lower clamp to slide on the bracket.

[0013] The upper clamp includes an upper fixing plate, the upper fixing plate is slidably connected to the bracket, the upper fixing plate is provided with an upper clamp bracket, one end of the upper clamp bracket is provided with an upper transmission wheel, the lower end of the upper transmission wheel is connected to the retractable driving shaft, the other end of the upper clamp bracket is provided with an upper passive wheel, the lower end of the upper passive wheel is connected to the upper workpiece rotating shaft; an upper transmission belt is provided between the upper end of the upper transmission wheel and the upper end of the upper passive wheel, and the upper transmission wheel drives the upper passive wheel to rotate through the upper transmission and then drives the upper workpiece rotating shaft to rotate;

[0014] The lower clamp includes a lower fixed plate, which is slidably connected to the bracket, and the lower fixed plate is provided with a lower clamp bracket. A lower transmission wheel is provided at one end of the lower clamp bracket, and the upper end of the lower transmission wheel is connected to the retractable driving shaft. A lower passive wheel is provided at the other end of the lower clamp bracket, and the upper end of the lower passive wheel is connected to the lower workpiece rotating shaft; a lower transmission belt is provided between the lower end of the lower transmission wheel and the lower end of the lower passive wheel, and the lower transmission wheel drives the lower passive wheel to rotate through the lower transmission belt and then drives the lower workpiece rotating shaft to rotate.

[0015] The sliding device includes a slide rail arranged on the bracket, and the upper fixed plate and the lower fixed plate are slidably connected to the bracket through the slide rail; the upper fixed plate is fixed with a first rack, and the lower fixed plate is fixed with a second rack, and the first rack is parallel to the second rack; the bracket is provided with a gear, and the gear is arranged between the first rack and the second rack, and the lower end of the first rack and the upper end of the second rack are respectively engaged with the two sides of the gear.

[0016] The bracket is provided with a driving device, and the driving device drives the upper clamp or the lower clamp to move, and drives the lower clamp or the upper clamp through a combination of the first rack, the second rack, and the gear.

[0017] The driving device is a cylinder.

[0018] The telescopic drive shaft is a splined shaft.

[0019] The advantages of the present invention are:

[0020] The present invention utilizes a slewing bearing and a spline shaft with an inner gear ring and an outer gear ring, and drives the outer gear ring through a main driving gear to realize the left and right rotation of the entire polishing machine workpiece clamping assembly on a vertical plane; the inner gear ring can rotate independently relative to the outer gear ring, a planetary bracket is provided on the inner gear ring, and an umbrella-shaped driving gear is installed, which is vertically meshed with the umbrella-shaped passive gear on the spline shaft to realize variable transmission, so that the upper workpiece rotating shaft and the lower workpiece rotating shaft connected to the spline shaft rotate synchronously, and at the same time, the telescopic structure of the spline shaft is utilized to realize the upper and lower clamps to move towards each other while the upper and lower workpiece rotating shafts rotate synchronously, thereby clamping the workpiece.

[0021] The use of the slewing bearings of the inner gear ring and the outer gear ring makes the motion control mechanism of the workpiece clamping assembly for the polishing machine of the present invention simple, compact, small in size, high in precision and good in synchronization compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the present invention Figure 1 .

[0024] Figure 3 This is a schematic diagram of the structure of the present invention Figure 2 .

[0025] Figure 4 This is a schematic diagram of the structure of the present invention Figure 3 .

[0026] Figure 5 It is a schematic diagram of the slewing bearing in the structure of the present invention.

[0027] In the figure: 1-inner ring gear; 2-outer ring gear; 3-first meshing teeth; 4-second meshing teeth; 7-first fixed plate; 8-second fixed plate; 9-first drive motor; 10-second drive motor; 11-main drive gear; 12-planetary bracket; 13-planetary driving gear; 14-planetary driven gear; 15-umbrella-shaped driving gear; 16-bracket; 17-spline shaft; 18-upper workpiece rotating shaft; 19-lower workpiece rotating shaft; 20-umbrella-shaped driven gear; 21-upper fixed plate; 22-lower fixed plate; 23-upper fixture bracket; 24-lower fixture bracket; 25-upper transmission wheel; 26-upper driven wheel; 27-upper transmission belt; 28-lower transmission wheel; 29-lower driven wheel; 30-lower transmission belt; 31-slide rail; 32-first rack; 33-second rack; 34-gear; 35-driving device. DETAILED DESCRIPTION

[0028] The present invention is a motion control mechanism for a workpiece clamping assembly for a polishing machine, which comprises a clamping assembly, a combined bearing, and a power mechanism;

[0029] The combined bearing includes Figure 5 The slewing bearing shown is provided with an inner gear ring 1 and an outer gear ring 2, and Figure 4As shown, the planetary driving gear 13 and the planetary driven gear 14 are arranged on the planetary carrier 12 in the inner gear ring 1. The planetary driving gear 13 is engaged with the planetary driven gear 14, and the planetary driven gear 14 is engaged with the inner gear ring 1. The planetary driving gear 13 drives the planetary driven gear 14 installed on the planetary carrier 12, and the planetary driven gear 14 rotates along with the fixed inner gear ring 1; Figure 3 As shown, an umbrella-shaped driving gear 15 is provided on the planetary support 12 to realize 90° shift transmission.

[0030] The power mechanism includes a first drive motor 9 and a second drive motor 10. The output shaft of the first drive motor 9 is connected to the main drive gear 11, and the main drive gear 11 is meshed with the outer ring gear 2. The output shaft of the second drive motor 10 is connected to the planetary driving gear 13.

[0031] The clamping assembly includes a bracket 16 and a retractable drive shaft, and the bracket 16 is connected to the outer gear ring 2; an upper clamp and a lower clamp that can slide relatively are respectively provided at both ends of the bracket 16. Figure 2 、 Figure 3 、 Figure 4 As shown, the upper clamp is provided with an upper workpiece rotating shaft 18, and the lower clamp is provided with a lower workpiece rotating shaft 19; the retractable drive shaft is provided with an umbrella-shaped passive gear 20, and the umbrella-shaped active gear 15 is engaged with the umbrella-shaped passive gear 20 to realize the displacement transmission of power, drive the umbrella-shaped passive gear 20 to rotate, and then drive the retractable drive shaft to rotate in the vertical direction, and the retractable drive shaft drives the upper workpiece rotating shaft 18 and the lower workpiece rotating shaft 19 to rotate synchronously.

[0032] Preferably, the telescopic drive shaft is a splined shaft 17 .

[0033] As a preferred embodiment, Figure 1 As shown, a first fixed plate 7 is provided, and the clamping assembly can also be connected to the outer ring gear 2 through the first fixed plate 7. A specific implementation method is that the bracket 16 is fixed on one side of the first fixed plate 7, and the other side of the first fixed plate 7 is fixedly connected to the outer ring gear 2 of the combined bearing. The first fixed plate 7 is provided with a hole for the planetary bracket 12 to pass through; a second fixed plate 8 is provided, and the first drive motor 9 and the second drive motor 10 are provided on the second fixed plate 8. The second fixed plate 8 is also provided with a hole for the output shaft of the first drive motor 9 and the output shaft of the second motor 10 to pass through. The output shaft of the first drive motor 9 is connected to the main drive gear 11, and the main drive gear 11 is engaged with the outer ring gear 2. The output shaft of the second drive motor 10 is connected to the planetary driving gear 13.

[0034] The upper fixture includes an upper fixed plate 21, which is slidably connected to the bracket 16. The upper fixed plate 21 is provided with an upper fixture bracket 23. An upper transmission wheel 25 is provided at one end of the upper fixture bracket 23. The lower end of the upper transmission wheel 25 is connected to the spline shaft 17. An upper passive wheel 26 is provided at the other end of the upper fixture bracket 23. The lower end of the upper passive wheel 26 is connected to the upper workpiece rotating shaft 18; an upper transmission belt 27 is provided between the upper end of the upper transmission wheel 25 and the upper end of the upper passive wheel 26. The rotation of the spline shaft 17 drives the upper transmission wheel 25 to rotate, and drives the upper transmission belt 27 to rotate, thereby driving the upper passive wheel 26 to rotate and then driving the upper workpiece rotating shaft 18 to rotate.

[0035] The lower clamp includes a lower fixed plate 22, which is slidingly connected to the bracket 16. The lower fixed plate 22 is provided with a lower clamp bracket 24. A lower transmission wheel 28 is provided at one end of the lower clamp bracket 24. The upper end of the lower transmission wheel 28 is connected to the spline shaft 17. A lower passive wheel 29 is provided at the other end of the lower clamp bracket 24. The upper end of the lower passive wheel 29 is connected to the lower workpiece rotating shaft 19; a lower transmission belt 30 is provided between the lower end of the lower transmission wheel 28 and the lower end of the lower passive wheel 29, and the rotation of the spline shaft 17 drives the lower transmission wheel 28 to rotate, and drives the lower transmission belt 30 to rotate, thereby driving the lower passive wheel rotation 29 to rotate, and then driving the lower workpiece rotating shaft 19 to rotate.

[0036] The bracket 16 is provided with a sliding device for the upper clamp and the lower clamp to slide on the bracket 16. Figure 1 、 Figure 2 As shown, the sliding device includes a slide rail 31 arranged on the bracket 16, and the upper fixed plate 21 and the lower fixed plate 22 are slidably connected to the bracket 16 through the slide rail 31; the upper fixed plate 21 is fixed with a first rack 32 extending downward; the lower fixed plate 22 is fixed with a second rack 33 extending upward; the first rack 32 is parallel to the second rack 33, and the two run towards or away from each other; the bracket is provided with a gear 34, and the gear 34 is arranged between the first rack 32 and the second rack 33, and the lower end of the first rack 32 and the upper end of the second rack 33 are respectively engaged with the two sides of the gear 34.

[0037] The bracket 16 is provided with a driving device 35 , and the driving device 35 drives the upper clamp or the lower clamp to move, and drives the lower clamp or the upper clamp through the combination of the first rack 32 , the second rack 33 , and the gear 34 .

[0038] Preferably, the driving device 35 is a cylinder.

[0039] If the cylinder is set at the upper clamp end, the cylinder pushes the first rack 32 of the upper fixed plate 21 to move downward, driving the gear 34 to rotate, thereby driving the second rack 33 of the lower fixed plate 22 to move upward, thereby bringing the upper and lower clamps closer together. Because a retractable spline shaft 17 is used, the upper workpiece rotating shaft 18 and the lower workpiece rotating shaft 19 can rotate synchronously at the same time during the process of the upper and lower clamps approaching each other.

[0040] The same applies to setting the cylinder at the lower clamp end.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. That is, any equivalent changes and modifications made according to the content of the patent application of the present invention should fall within the technical scope of the present invention.

Claims

1. A motion control mechanism for a workpiece clamping assembly for a polishing machine, comprising a clamping assembly, a combined bearing, and a power mechanism; characterized in that: The combined bearing comprises a slewing bearing provided with an inner gear ring (1) and an outer gear ring (2), and a planetary driving gear (13) and a planetary driven gear (14) provided on a planetary support (12) within the inner gear ring (1), wherein the planetary driving gear (13) meshes with the planetary driven gear (14), and the planetary driven gear (14) meshes with the inner gear ring (1), and an umbrella-shaped driving gear (15) is provided on the planetary support (12); The power mechanism comprises a first drive motor (9) and a second drive motor (10), wherein the output shaft of the first drive motor (9) is connected to a main drive gear (11), the main drive gear (11) is meshed with the outer gear ring (2), and the output shaft of the second drive motor (10) is connected to the planetary driving gear (13); The clamping assembly includes a bracket (16) and a retractable drive shaft, and the bracket (16) is connected to the outer gear ring (2); an upper clamp and a lower clamp that can slide relative to each other are respectively provided at both ends of the bracket (16), the upper clamp is provided with an upper workpiece rotating shaft (18), and the lower clamp is provided with a lower workpiece rotating shaft (19); the retractable drive shaft is provided with an umbrella-shaped passive gear (20), the umbrella-shaped active gear (15) is engaged with the umbrella-shaped passive gear (20), and drives the umbrella-shaped passive gear (20) to rotate, thereby driving the retractable drive shaft to rotate, and the retractable drive shaft drives the upper workpiece rotating shaft (18) and the lower workpiece rotating shaft (19) to rotate synchronously; the bracket (16) is provided with a sliding device that drives the upper clamp and the lower clamp to slide on the bracket (16).

2. The motion control mechanism of the workpiece clamping assembly for a polishing machine according to claim 1, characterized in that: The upper clamp comprises an upper fixed plate (21), the upper fixed plate (21) is slidably connected to the bracket (16), the upper fixed plate (21) is provided with an upper clamp bracket (23), one end of the upper clamp bracket (23) is provided with an upper transmission wheel (25), the lower end of the upper transmission wheel (25) is connected to the retractable drive shaft, the other end of the upper clamp bracket (23) is provided with an upper passive wheel (26), the lower end of the upper passive wheel (26) is connected to the upper workpiece rotating shaft (18); an upper transmission belt (27) is provided between the upper end of the upper transmission wheel (25) and the upper end of the upper passive wheel (26), the upper transmission wheel (25) drives the upper passive wheel (26) to rotate through the upper transmission belt (27) and then drives the upper workpiece rotating shaft (18) to rotate; The lower clamp comprises a lower fixed plate (22), the lower fixed plate (22) is slidably connected to the bracket (16), the lower fixed plate (22) is provided with a lower clamp bracket (24), one end of the lower clamp bracket (24) is provided with a lower transmission wheel (28), the upper end of the lower transmission wheel (28) is connected to the retractable drive shaft, the other end of the lower clamp bracket (24) is provided with a lower passive wheel (29), the upper end of the lower passive wheel (29) is connected to the lower workpiece rotating shaft (19); a lower transmission belt (30) is provided between the lower end of the lower transmission wheel (28) and the lower end of the lower passive wheel (29), the lower transmission wheel (28) drives the lower passive wheel (29) to rotate through the lower transmission belt (30) and then drives the lower workpiece rotating shaft (19) to rotate.

3. The motion control mechanism of the workpiece clamping assembly for a polishing machine according to claim 2, characterized in that: The sliding device includes a slide rail (31) arranged on the bracket (16), and the upper fixed plate (21) and the lower fixed plate (22) are slidably connected to the bracket (16) through the slide rail (31); the upper fixed plate (21) is fixedly provided with a first rack (32), and the lower fixed plate (22) is fixedly provided with a second rack (33), and the first rack (32) is parallel to the second rack (33); the bracket is provided with a gear (34), and the gear (34) is provided between the first rack (32) and the second rack (33), and the lower end of the first rack (32) and the upper end of the second rack (33) are respectively engaged with two sides of the gear (34).

4. The motion control mechanism of the workpiece clamping assembly for a polishing machine according to claim 3, characterized in that: The bracket (16) is provided with a driving device (35), and the driving device (35) drives the upper clamp or the lower clamp to move, and drives the lower clamp or the upper clamp through a combination of the first rack (32), the second rack (33), and the gear (34).

5. The motion control mechanism of the workpiece clamping assembly for a polishing machine according to claim 4, characterized in that: The driving device (35) is a cylinder.

6. The motion control mechanism of the workpiece clamping assembly for a polishing machine according to claim 1, characterized in that: The telescopic drive shaft is a spline shaft (17).

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