A multi-position positioning mechanism for a planetary gear train of a double-sided grinding machine

Abstract

The present invention relates to the technical field of grinding equipment, and specifically to a multi-station positioning mechanism for a planetary gear system of a double-sided grinder, comprising a frame and a grinding table arranged above it, and a sealing cover installed by a lifting mechanism, and further comprising: a sun gear and an outer ring gear concentrically distributed on the surface of the grinding table, the sun gear being connected to a driving mechanism; an annular grinding disc arranged between the sun gear and the outer ring gear, and a grinding disc arranged on the sealing cover forming a closed grinding chamber; and a plurality of workpiece mounting mechanisms arranged in the closed grinding chamber. The present invention enables the clamp to form a floating clamping force in the radial and axial directions through a spring and a slider linkage mechanism arranged in the planetary gear. When the grinding chips on both sides of the workpiece are unevenly accumulated, the vertical slider realizes axial displacement through the elastic compensation of the first spring, and the horizontal slider adjusts the radial clamping force through the second spring to ensure that the workpiece always maintains uniform contact pressure with the upper and lower grinding discs.

Description

Technical Field

[0001] The invention relates to the technical field of grinding equipment, in particular to a multi-station positioning mechanism of a planetary gear train of a double-sided grinding machine. Background Art

[0002] Double-sided grinders, as important equipment in the field of precision machining, are widely used in the precision machining of hard and brittle materials such as semiconductors, optical glass, and ceramics. Traditional double-sided grinders primarily use upper and lower grinding discs to simultaneously grind both sides of the workpiece, with the planetary gear train being a key component for achieving uniform grinding of the workpiece. In the prior art, a typical double-sided grinder typically includes a frame, upper and lower grinding discs, a sun gear, an internal gear ring, and planetary gears. The planetary gears drive the workpiece to perform complex planetary motions between the upper and lower grinding discs, achieving uniform grinding of both sides of the workpiece.

[0003] In the prior art, for example, a Chinese utility model patent with publication number CN219275526U, titled "A planetary gear and device for double-sided grinding of gallium nitride wafers," specifically discloses a technical solution comprising a planetary gear body made of a hard material, the planetary gear body being provided with a plurality of through holes for placing gallium nitride wafers, and the hole wall of each through hole having a flexible layer.

[0004] The above solution transforms the rigid contact between the planetary gear and the wafer into flexible contact by providing a flexible layer on the wall of the planetary gear through-hole. This not only effectively solves the problem of chipping of the gallium nitride wafer edges during grinding, thereby improving the overall yield, but also improves the wafer grinding efficiency and grinding uniformity.

[0005] However, traditional workpiece clamping mechanisms are mostly rigid fixing methods. During the grinding process, grinding chips are easily accumulated between the workpiece and the grinding wheel. The accumulation of grinding chips generated during the grinding process between the workpiece and the grinding wheel is spatially asymmetric. When the thickness of the grinding chip layer on both sides of the workpiece is inconsistent (usually due to the effect of gravity, the grinding chips on the lower part are more likely to be deposited), the force balance of the workpiece will be destroyed. Since the existing rigid clamps cannot dynamically adjust the clamping force, the workpiece will tilt or shift. Due to the inconsistent thickness of the grinding chip layer on the two sides of the workpiece, the force on both sides of the workpiece is unbalanced, affecting the surface flatness, and causing uneven grinding pressure; it may also interfere with the fixation of the workpiece, resulting in positioning offset or loosening.

[0006] In addition, grinding debris hinders effective contact, reduces grinding efficiency, and may cause scratches on the workpiece surface.

[0007] Therefore, a multi-station positioning mechanism for a planetary gear train of a double-sided grinding machine is proposed to solve the above-mentioned problems. Summary of the Invention

[0008] Technical problems solved

[0009] In response to the above-mentioned shortcomings of the prior art, the present invention provides a multi-station positioning mechanism for a planetary gear system of a double-sided grinder, which can solve the problems of unstable workpiece positioning, uneven grinding pressure and incomplete cleaning of grinding chips caused by the accumulation of grinding chips during the operation of the double-sided grinder in the prior art.

[0010] Technical Solution

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0012] The present invention provides a multi-station positioning mechanism for a planetary gear system of a double-sided grinder, comprising a frame, a grinding table arranged above the frame, and a sealing cover also arranged on the frame; wherein, a rotatable sun gear and an outer ring gear are concentrically distributed on the grinding table, and an annular grinding disc constituting a closed grinding chamber is arranged on the outside of the sun gear and the outer ring gear, and a plurality of workpiece mounting mechanisms are also arranged in the closed grinding chamber; the workpiece mounting mechanism comprises a planetary gear meshingly connected to the sun gear and the outer ring gear, and mounting grooves for carrying workpieces are circumferentially distributed on the planetary gear, a positioning mechanism is arranged in the mounting groove, and the positioning mechanism forms a floating clamping force on the workpiece in the radial and axial directions of the mounting groove, and enables the workpiece to always maintain an adaptive contact pressure with the grinding disc.

[0013] Furthermore, a card slot is provided on the inner wall of the planetary gear, a vertically distributed vertical rod is provided in the card slot, and the positioning mechanism includes a vertical slider mounted on the vertical rod, a cross rod perpendicular to the vertical rod is provided on the surface of the vertical slider, a slidable horizontal slider is installed on the surface of the cross rod through a second spring, a clamp is connected to one end of the horizontal slider facing the mounting slot, and the surface of the vertical rod is connected to the first spring on both the upper and lower sides of the vertical slider.

[0014] Furthermore, a hollow groove is provided on the surface of the planetary gear, and a downwardly inclined chip guide slope is provided between the mounting groove and the hollow groove.

[0015] Furthermore, the surfaces of the upper and lower groups of grinding discs are both provided with chip collecting grooves, and a scraper is installed in the upper chip collecting groove.

[0016] Furthermore, an air intake is provided at the chip collecting groove below, and the air intake is connected to the negative pressure fan installed in the frame. The surface of the sealing cover is provided with air inlets distributed in an equidistant circle, and the air inlets are located below the grinding disc installed on the sealing cover.

[0017] Furthermore, a sliding rod is inserted on the surface of the sealing cover above the chip collecting groove, the upper end of the sliding rod is connected to a third spring, the lower end of the sliding rod is connected to a scraper, and a pressure regulating mechanism is also installed on the sealing cover to control the sliding distance of the scraper.

[0018] Furthermore, the pressure regulating mechanism includes a rotating shaft rotatably connected to the sealing cover, and the rotating shaft and the sun gear are distributed in concentric circles.

[0019] Furthermore, the surface of the rotating shaft is also connected to a turntable, the surface of the turntable is provided with a slide rail, the surface of the slide rail is slidably installed with a slide table through a fourth spring, the surface of the slide table is connected to a pressure block, and the pressure block is an arc-shaped structure, and its inclined surface is in dynamic contact with the slide rod to realize speed-adaptive scraper pressure control.

[0020] Furthermore, a synchronization mechanism connected to the sun gear is provided on the rotating shaft, and the synchronization mechanism includes an insertion rod slidably installed in the rotating shaft, the lower end of the insertion rod is connected to a cross plug, and a cross slot adapted to the cross plug is provided at the center of the sun gear.

[0021] Furthermore, the scraper has a contact surface oblique to the revolution direction of the planetary gear, and an elastic scraping portion made of rubber material.

[0022] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0023] The present invention utilizes a spring and slider linkage mechanism within the planetary gears to enable the clamp to generate a floating clamping force in both the radial and axial directions. When grinding chips accumulate unevenly on both sides of the workpiece, the vertical slider achieves axial displacement through elastic compensation by the first spring, while the horizontal slider adjusts the radial clamping force via the second spring, ensuring that the workpiece maintains uniform contact pressure with the upper and lower grinding discs. The guide structure formed by the slots and vertical rods limits unintended movement of the workpiece within the planetary gears. Combined with the flexible clamping of the elastic clamp, this prevents scratches on the workpiece surface caused by rigid fixation.

[0024] In addition, the pressure adjustment mechanism rotates synchronously with the sun gear via a rotating shaft. Centrifugal force drives the slide, which in turn moves the pressure block outward, dynamically adjusting the scraper's downward pressure. The higher the speed, the greater the scraping pressure, matching the rate of chip generation.

[0025] The directional airflow formed by the suction port and the air inlet draws the grinding chips from the chip guide slope into the chip collecting groove. Combined with the weight-reducing design of the hollow groove, the dual goals of efficient removal of grinding chips and lightweight equipment are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0027] Figure 1Schematic diagram of the internal structure of the grinding table in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the sealing cover above the grinding table after being combined in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the installation of a workpiece mounting mechanism in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the chip collecting groove position distribution in an embodiment of the present invention;

[0031] Figure 5 A schematic cross-sectional view of a workpiece mounting mechanism according to an embodiment of the present invention;

[0032] Figure 6 for Figure 5 A schematic diagram of the structure at center A;

[0033] Figure 7 This is a schematic diagram of the installation of the pressure regulating mechanism in an embodiment of the present invention;

[0034] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point B in the middle;

[0035] Figure 9 Schematic diagram of the cross section of the installation of the scraper in the embodiment of the present invention;

[0036] Figure 10 Schematic diagram of the synchronization mechanism in an embodiment of the present invention.

[0037] The numbers in the figure represent: 1. frame; 2. grinding table; 3. sun gear; 4. outer ring gear; 5. workpiece mounting mechanism; 501. planetary gear; 502. mounting slot; 503. clamping slot; 504. vertical rod; 505. vertical slider; 506. first spring; 507. cross rod; 508. horizontal slider; 509. clamp; 510. second spring; 511. hollow groove; 6. grinding disc; 7. sealing cover; 8. chip collecting groove; 9. air intake; 10. fixing rod; 11. support plate; 12. third spring; 13. slide rod; 14. scraper; 15. rotating shaft; 16. plug rod; 17. cross plug; 18. turntable; 19. slide rail; 20. fourth spring; 21. slide table; 22. pressure block; 23. air inlet. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0042] The present invention will be further described below with reference to the embodiments.

[0043] Example:

[0044] Please refer to the attached Figure 1-10 This proposal proposes a planetary gear train multi-station positioning mechanism for double-sided grinding machines. This solves key technical issues such as unstable workpiece positioning, uneven grinding pressure, and incomplete chip removal caused by chip accumulation during operation. By utilizing a planetary gear-driven multi-station positioning mechanism, combined with an elastic clamping device and a speed-adaptive chip removal system, the workpiece is precisely positioned during double-sided grinding, while effectively removing grinding chips, improving machining accuracy and efficiency.

[0045] Specifically, the double-side grinder includes a grinding table 2 mounted on a frame 1. A sun gear 3 and an outer ring gear 4 are mounted on the grinding table 2 in a concentric arrangement. The sun gear 3 is mounted on the motor output shaft disposed within the frame 1, and the outer ring gear 4 is fixedly connected to the surface of the grinding table 2. An annular grinding disc 6 is disposed on the surface of the grinding table 2, located between the sun gear 3 and the outer ring gear 4, for grinding the surface of the workpiece.

[0046] The grinding table 2 is also equipped with several sets of workpiece mounting mechanisms 5 located between the sun gear 3 and the outer ring gear 4. The workpiece mounting mechanisms 5 are placed on the surface of the grinding disc 6 and are used to secure the workpiece to be ground. When the motor is turned on and drives the sun gear 3 to rotate, the sun gear 3 synchronously drives the workpiece mounting mechanisms 5 to rotate around itself, causing the workpiece placed on the workpiece mounting mechanisms 5 to rub against the surface of the grinding disc 6 during movement, thereby achieving grinding.

[0047] A sealing cover 7 is also mounted on the frame 1 via a lifting device, and a set of grinding discs 6 are also mounted inside the sealing cover 7. By driving the sealing cover 7 up and down by the lifting device, the spacing between the two sets of grinding discs 6 can be adjusted, thereby enabling the two sets of grinding discs 6 to perform double-sided grinding on workpieces of different thicknesses fixed on the workpiece mounting mechanism 5.

[0048] More specifically, the workpiece mounting mechanism 5 includes a planetary gear 501 disposed between the sun gear 3 and the outer ring gear 4. The surface of the planetary gear 501 is provided with several groups of mounting grooves 502. Positioning mechanisms are installed in the mounting grooves 502 for clamping and fixing the workpiece to be ground.

[0049] Planetary gears 501 mesh with both the sun gear 3 and the outer ring gear 4. When the sun gear 3 rotates, it engages the planetary gears 501 in rotation, causing the workpiece, held within the mounting slot 502, to come into contact with the upper and lower grinding discs 6, achieving double-sided grinding of the workpiece. Simultaneously, as the planetary gears 501 rotate, the meshing of the outer ring gear 4 and the planetary gears 501 causes them to orbit around the sun gear 3, driving the workpiece in a circular motion. This achieves simultaneous and uniform grinding of both sides of the workpiece, improving grinding efficiency and surface quality.

[0050] The difference lies in the fact that the inner wall of the planetary gear 501 is provided with a retaining groove 503, arranged in two groups symmetrically on either side of the mounting slot 502. A vertical rod 504 is positioned within the retaining groove 503, and the positioning mechanism comprises a vertical slider 505 that is sleeved and mounted on the vertical rod 504. A horizontal rod 507, perpendicular to the vertical rod 504, is mounted on the surface of the vertical slider 505. A slidable horizontal slider 508 is mounted on the surface of the horizontal rod 507 via a second spring 510. A clamp 509 is attached to the end of the horizontal slider 508 that faces into the mounting slot 502.

[0051] When a workpiece needs to be installed, it is placed in the installation slot 502 and between the two sets of clamps 509. Under the elastic force of the second spring 510, the two sets of clamps 509 always tend to move toward the center of the installation slot 502, thereby enabling the two sets of clamps 509 to clamp and secure the workpiece, achieving rapid installation of the workpiece on the planetary gear 501.

[0052] When the workpiece is mounted on the planetary gear 501, the lower surface of the workpiece contacts the grinding disc 6 fixed on the grinding table 2, and the upper surface of the planetary gear 501 contacts the grinding disc 6 fixed on the sealing cover 7; thus, during the movement of the workpiece, both sides of the workpiece will be ground by the two sets of grinding discs 6.

[0053] The surface of the vertical rod 504 is located on both the upper and lower sides of the vertical slider 505, and is connected to first springs 506. When the two sets of clamps 509 clamp and secure the workpiece, the vertical slider 505 is held in the middle position within the clamping slot 503 by the elastic force of the two sets of first springs 506. This allows the workpiece in the mounting slot 502 to move. During the grinding process, when grinding debris enters the gap between the workpiece and the grinding disc 6, it will accumulate between the workpiece and the grinding disc 6, potentially resulting in uneven grinding and affecting the surface finish and dimensional accuracy of the workpiece.

[0054] In particular, when the amount of accumulated grinding debris on the two sides of the workpiece differs, the inconsistent grinding debris thickness will result in different grinding forces on both sides of the workpiece, resulting in uneven workpiece surfaces, which will affect the final dimensional accuracy and surface finish of the workpiece. The first spring 506 can apply constant pressure to ensure that the workpiece is always tightly attached to the surfaces of the upper and lower grinding discs 6, ensuring that each side of the workpiece is evenly ground.

[0055] It is worth noting that the surfaces of the upper and lower grinding discs 6 are both provided with chip collecting grooves 8 , and a scraper 14 is installed in the chip collecting groove 8 located on the upper side.

[0056] When the planetary gear 501 moves between the two sets of grinding discs 6 and the workpiece moves between the two sets of chip collecting grooves 8, the grinding chips on the lower surface of the workpiece will fall into the lower chip collecting groove 8, while the grinding chips on the upper surface of the workpiece will be scraped off by the scraper 14 and retained in the upper chip collecting groove 8. This can clean the grinding chips on both the upper and lower surfaces of the workpiece, making it easier to continue grinding the workpiece.

[0057] After the planetary gear 501 moves away from between the two sets of chip collecting grooves 8, the grinding chips retained in the upper chip collecting groove 8 will also fall into the lower chip collecting groove 8, thereby realizing the collection of the grinding chips.

[0058] The surface of the sealing cover 7 is provided with an opening above the chip trough 8. A slide bar 13 is inserted into the opening. The upper end of the slide bar 13 is connected to a third spring 12, and the lower end of the slide bar 13 is connected to a scraper 14. The third spring 12 constantly provides a force for the slide bar 13 to slide upward on the sealing cover 7, thereby causing the scraper 14 to have a tendency to move upward within the chip trough 8.

[0059] Avoid the scraper 14 extending too far from the chip collecting groove 8, which would cause the scraper 14 to block the rotation of the workpiece.

[0060] The sealing cover 7 is also equipped with a pressure adjustment mechanism to control the downward distance of the scraper 14, ensuring a more pronounced downward pressure and closer contact with the workpiece surface, effectively removing thicker or harder abrasive debris. Furthermore, the scraper 14 can be made of a soft rubber material, which prevents it from causing hard scratches or marks on the workpiece when in contact with the workpiece, unlike metal scrapers.

[0061] It should be noted that the pressure adjustment mechanism includes a rotating shaft 15 rotatably connected to the sealing cover 7. The rotating shaft 15 and the sun gear 3 are arranged concentrically. A synchronization mechanism is provided on the rotating shaft 15. When the sealing cover 7 is lowered by the lifting mechanism to adjust the spacing between the two sets of grinding discs 6, the rotating shaft 15 is connected to the sun gear 3 through the synchronization mechanism, thereby causing the sun gear 3 to rotate and drive the rotating shaft 15 to rotate at the same speed.

[0062] The rotating shaft 15 is also connected to a rotating disk 18. A slide rail 19 is provided on the surface of the rotating disk 18. A slide 21 is slidably mounted on the surface of the slide rail 19 via a fourth spring 20. When the slide 21 is not affected by external forces, the spring force of the fourth spring 20 causes the slide 21 to always slide toward the center of the rotating disk 18. When the rotating shaft 15 drives the rotating disk 18 to rotate, the centrifugal force of the slide 21 overcomes the spring force of the fourth spring 20, causing the slide 21 to slide outward on the slide rail 19.

[0063] The surface of the slide 21 is connected to a pressure block 22, which is configured to be arc-shaped, and the lower surface of the pressure block 22 is configured to be an inclined surface. When the slide 21 slides outward on the slide rail 19, it will simultaneously push the pressure block 22 to slide outward. The slide bar 13 is on the rotation trajectory of the pressure block 22, and under the elastic force of the third spring 12, the slide bar 13 will upwardly impact the inclined surface below the pressure block 22. The inclined surface below the pressure block 22 is distributed in an inclined shape from the inside to the outside and from the bottom to the top, so that when the pressure block 22 moves outward, it will push the slide bar 13 to slide downward on the sealing cover 7 and overcome the elastic force of the third spring 12, further pushing the scraper 14 to slide down in the chip collecting groove 8.

[0064] Furthermore, the rotational speed of the rotating shaft 15 is the same as that of the sun gear 3, while the rotational speed of the workpiece mounting mechanism 5 is affected by the sun gear 3. Therefore, the faster the sun gear 3 rotates, the faster the planetary gear 501 rotates, which means that the contact time between the grinding wheel 6 and the workpiece is shortened, but the contact frequency per unit area increases, so the overall amount of abrasive debris generated may increase. Furthermore, the faster the sun gear 3 rotates, the stronger the centrifugal force generated, which in turn controls the distance that the pressure block 22 slides outward, pushing the scraper 14 downward a longer distance, allowing the scraper 14 to squeeze the workpiece surface more tightly, achieving sufficient cleaning of the abrasive debris. This ensures that the cleaning effect of the abrasive debris is compatible with the generation efficiency, ensuring the cleaning effect of the abrasive debris.

[0065] Multiple sets of pressure adjustment mechanisms are provided, the specific number of which matches the number of workpiece mounting mechanisms 5. This allows each set of workpiece mounting mechanisms 5 to control the scraper 14 to slide down a certain depth when it moves between the two chip flutes 8, thereby improving the scraper 14's effectiveness in cleaning wear debris. The pressure block 22 is designed in an arc shape, with one side shorter than the other in the direction of rotation, placing the workpiece mounting mechanism 5 at the center of the pressure block 22. Consequently, before the workpiece mounting mechanism 5 enters between the two sets of chip flutes 8, the pressure block 22 controls the scraper 14 to press down a certain depth, ensuring that wear debris is removed as the workpiece mounting mechanism 5 passes through.

[0066] The lower surface of the scraper 14 is set to be inclined, and the inclined surface faces the side of the planetary gear 501 that revolves. As a result, when the scraper 14 is pressed down too deep, the workpiece will come into contact with the inclined surface of the scraper 14 and push the scraper 14 to undergo a certain deformation and move upward, thereby avoiding the operation jam of the planetary gear 501.

[0067] It is worth noting that when the sealing cover 7 adjusts the distance between the two sets of grinding discs 6, it covers the outside of the grinding table 2, thereby sealing the grinding space between the two sets of grinding discs 6. This prevents the escape of grinding chips during the grinding process and also prevents the ingress of dust during the grinding process. An air intake vent 9 is provided below the chip trough 8 and is connected to the negative pressure fan installed in the frame 1.

[0068] When the workpiece is being polished, turning on the negative pressure blower generates wind, which actively draws the grinding chips from the chip trough 8 into the chip trough 8, achieving uniform collection of the grinding chips. The surface of the sealing cover 7 is provided with air inlets 23 distributed equidistantly around the circumference. The air inlets 23 are located below the grinding disc 6 mounted on the sealing cover 7. As the wind flows, it is drawn in through the air inlets 23, creating a negative pressure in the grinding space. This actively draws in the grinding chips from the workpiece, grinding disc 6, and planetary gear 501, improving the cleaning effect of the grinding chips and ensuring the grinding effect of the workpiece.

[0069] The synchronization mechanism includes a rod 16 slidably mounted within the rotating shaft 15. A cross plug 17 is connected to the lower end of the rod 16. A cross slot mates with the cross plug 17 at the center of the sun gear 3. When the lifting mechanism drives the sealing cover 7 downward, the height of the rod 16 within the rotating shaft 15 is adjusted and secured with bolts. By inserting the cross plug 17 into the cross slot on the surface of the sun gear 3, the sun gear 3 and the rotating shaft 15 rotate synchronously. Furthermore, when grinding workpieces of varying heights, the downward pressure of the scraper 14 can be adjusted to improve the cleaning effect of the grinding debris.

[0070] A hollow groove 511 is also provided on the surface of the planetary gear 501, outside the mounting groove 502. This reduces the weight of the planetary gear 501, thereby increasing the operating speed of the workpiece mounting mechanism 5. Furthermore, when grinding debris forms on the workpiece surface, it is displaced by the negative pressure wind and falls into the hollow groove 511, preventing it from being retained on the planetary gear 501 or the workpiece surface, thereby improving the workpiece grinding effect.

[0071] In addition, the portion between the hollow groove 511 and the mounting groove 502 is configured as an inclined surface, and the inclined surface slopes downward from the mounting groove 502 to the side of the hollow groove 511, so that the grinding chips sliding off the surface of the workpiece fixed at the mounting groove 502 can better fall into the hollow groove 511 and be collected, thereby improving the grinding chip collection effect.

[0072] A fixed rod 10 is connected to the surface of the grinding table 2 and is aligned with the chip collection trough 8 below. Two sets of support plates 11 are slidably mounted on the surface of the fixed rod 10. The upper end surfaces of the two sets of support plates 11 are offset and flush with the upper surface of the grinding disc 6 below. By increasing and adjusting the spacing between the two sets of support plates 11 on the fixed rod 10, the gap size of the chip collection trough 8 below can be changed, thereby preventing undersized workpieces from falling and getting stuck when passing through the chip collection trough 8.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A planetary gear multi-position positioning mechanism for a double-sided grinding machine, characterized in that: include: A frame (1), wherein a grinding table (2) is provided above the frame (1), and a sealing cover (7) is also provided on the frame (1); The grinding table (2) is provided with a rotatable sun gear (3) and an outer gear ring (4) concentrically arranged thereon, and an annular grinding disc (6) is provided outside the sun gear (3) and the outer gear ring (4) to form a closed grinding cavity, and a plurality of workpiece mounting mechanisms (5) are also provided inside the closed grinding cavity; The workpiece mounting mechanism (5) comprises a planetary gear (501) meshingly connected to a sun gear (3) and an outer gear ring (4); a mounting groove (502) for carrying the workpiece is circumferentially distributed on the planetary gear (501); a positioning mechanism is provided in the mounting groove (502); the positioning mechanism forms a floating clamping force on the workpiece in the radial and axial directions of the mounting groove (502), and enables the workpiece to always maintain an adaptive contact pressure with the grinding disc (6); A slot (503) is provided on the inner wall of the planetary gear (501), and vertically distributed vertical rods (504) are provided in the slot (503); The positioning mechanism comprises a vertical slider (505) sleeved and mounted on a vertical rod (504); a horizontal rod (507) perpendicular to the vertical rod (504) is provided on the surface of the vertical slider (505); a slidable horizontal slider (508) is installed on the surface of the horizontal rod (507) via a second spring (510); one end of the horizontal slider (508) facing the mounting groove (502) is connected to a clamp (509); and the surface of the vertical rod (504) located on both upper and lower sides of the vertical slider (505) is connected to a first spring (506); The surfaces of the upper and lower grinding discs (6) are both provided with chip collecting grooves (8), and a scraper (14) is installed in the upper chip collecting groove (8); An air intake vent (9) is provided at the chip collecting groove (8) below, and the air intake vent (9) is connected to a negative pressure blower installed in the frame (1). The surface of the sealing cover (7) is provided with air inlets (23) distributed in an equidistant circle, and the air inlets (23) are located below the grinding disc (6) installed on the sealing cover (7); A slide bar (13) is inserted into the surface of the sealing cover (7) above the chip collecting groove (8), the upper end of the slide bar (13) is connected to a third spring (12), and the lower end of the slide bar (13) is connected to a scraper (14). A pressure regulating mechanism is also installed on the sealing cover (7) for controlling the sliding distance of the scraper (14).

2. A planetary gear train multi-station positioning mechanism for a double-sided grinding machine according to claim 1, characterized in that: A hollow groove (511) is provided on the surface of the planetary gear (501), and a downwardly inclined chip guide slope is provided between the mounting groove (502) and the hollow groove (511).

3. The planetary gear multi-station positioning mechanism for a double-sided grinding machine according to claim 1, characterized in that: The pressure regulating mechanism comprises a rotating shaft (15) rotatably connected to the sealing cover (7), and the rotating shaft (15) and the sun gear (3) are distributed in concentric circles.

4. A planetary gear train multi-station positioning mechanism for a double-sided grinding machine according to claim 3, characterized in that: The surface of the rotating shaft (15) is also connected to a rotating disk (18), and the surface of the rotating disk (18) is provided with a slide rail (19). The surface of the slide rail (19) is slidably mounted with a slide table (21) through a fourth spring (20). The surface of the slide table (21) is connected to a pressure block (22). The pressure block (22) is an arc-shaped structure, and its inclined surface is in dynamic contact with the slide rod (13) to achieve speed-adaptive scraper pressure control.

5. The planetary gear multi-station positioning mechanism for a double-sided grinding machine according to claim 3, characterized in that: The rotating shaft (15) is provided with a synchronization mechanism connected to the sun gear (3), and the synchronization mechanism includes an insertion rod (16) slidably mounted in the rotating shaft (15), the lower end of the insertion rod (16) is connected to a cross plug (17), and the center of the sun gear (3) is provided with a cross slot adapted to the cross plug (17).

6. The planetary gear train multi-station positioning mechanism for a double-sided grinding machine according to claim 3, characterized in that: The scraper (14) has a contact surface oblique to the revolution direction of the planetary gear (501), and an elastic scraping portion made of rubber material.

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