Polishing grinding head

Abstract

The invention discloses a polishing grinding head which aims at improving the sealing effect and effectively sealing static bonding surfaces between parts for solving grease leakage in a grinding head cavity and comprises a main shaft, a shaft sleeve, a grinding head seat and a grinding block, the main shaft is sleeved with the shaft sleeve, the lower portion of the shaft sleeve is fixedly connected with the grinding head seat, and the grinding block is fixedly connected with the shaft sleeve. The main shaft drives the grinding head seat to rotate through the shaft sleeve; the grinding block is arranged on the grinding head seat, the grinding head seat is connected with the main shaft through a bearing, a bottom cover for pressing the bearing is arranged at the lower end of the main shaft, and an annular silicon rubber pad is arranged between the bottom cover and the grinding head seat.

Description

Technical Field

[0001] The invention belongs to the technical field of polishing, and more specifically, relates to a polishing grinding head. Background Art

[0002] At present, the mainstream of polishing grinding heads is still the swing polishing structure. While the grinding head seat rotates to drive the grinding head to rotate, the swing mechanism in the grinding head seat can make the grinding head swing to improve the grinding and polishing effect.

[0003] For example, Patent 201520218290.7 discloses a grinding head device, including a revolution system of a grinding head and a swing system of a grinding block seat, wherein the revolution system of the grinding head includes a grinding head spindle, a grinding head connecting flange, a grinding head spindle connecting sleeve and a grinding head lower housing; the grinding head connecting flange is connected to the grinding head spindle, and the grinding head spindle is connected to the grinding head lower housing through the grinding head spindle connecting sleeve; the grinding head spindle drives the grinding head lower housing to rotate through the grinding head spindle connecting sleeve;

[0004] In the above-mentioned grinding head device, the grinding head spindle connecting sleeve is connected to the grinding head lower box body by bolts, thereby driving the grinding head lower box body to rotate, the grinding head lower box body is connected to the grinding head spindle by bearings, the lower end of the grinding head spindle is connected to a bottom cover, the bottom cover can fix the bearing, and a sealing gasket is provided between the bottom cover and the grinding head lower box body to prevent oil leakage of the grinding head lower box body and the bearing;

[0005] In practice, it is found that the sealing gasket is made of fluororubber, which has high hardness. When subjected to static friction for a long time, it will suffer severe wear and corrosion and is very easy to fail, thus causing oil leakage. Summary of the invention

[0006] The main purpose of the present invention is to provide a polishing grinding head, aiming to improve the sealing effect and effectively seal the static joint surfaces between parts to solve the problem of grease leakage in the grinding head cavity.

[0007] According to a first aspect of the present invention, a polishing grinding head is provided, comprising a main shaft, a sleeve, a grinding head seat and a grinding block, wherein the sleeve is sleeved on the main shaft, the lower part of the sleeve is fixedly connected to the grinding head seat, and the main shaft drives the grinding head seat to rotate via the sleeve; the grinding block is arranged on the grinding head seat, the grinding head seat is connected to the main shaft via a bearing, the lower end of the main shaft is provided with a bottom cover for pressing the bearing, and an annular silicone rubber pad is provided between the bottom cover and the grinding head seat.

[0008] In the above-mentioned polishing grinding head, the hardness of the silicone rubber pad is 45-80HA

[0009] In the above-mentioned polishing grinding head, the hardness of the silicone rubber pad is 55-75HA.

[0010] In the above-mentioned polishing grinding head, the silicone rubber pad is coaxial with the main shaft.

[0011] In the above-mentioned polishing grinding head, there is a gap between the main shaft and the sleeve, and the bearing is a spherical bearing.

[0012] In the above-mentioned polishing grinding head, the bottom cover presses the silicone rubber pad onto the grinding head seat through a pressing surface, and the pressing surface is an annular slope surface that gradually shrinks in a direction away from the lower end of the main shaft.

[0013] In the above-mentioned polishing grinding head, the grinding head seat includes a grinding head cover and a seat body, the grinding head cover is rotatably connected to the upper part of the sleeve, the seat body is fixedly connected to the lower part of the sleeve, the seat body is connected to the main shaft through the joint bearing, the seat body has an annular first mounting surface, the grinding head cover has an annular second mounting surface, the seat body is fixedly connected to the grinding head cover and allows the first mounting surface to contact the second mounting surface, and the first mounting surface and the second mounting surface are sealed by a first sealing ring.

[0014] In the above-mentioned polishing grinding head, an annular groove is provided on the first mounting surface or the second mounting surface, and the first sealing ring is located in the annular groove.

[0015] In the above-mentioned polishing grinding head, the cross-sectional outer contour of the first sealing ring is a rectangle.

[0016] In the above-mentioned polishing grinding head, the grinding head seat is provided with a swing mechanism, the grinding block is connected to the swing mechanism, and the swing mechanism drives the grinding block to swing;

[0017] The swing mechanism comprises a wave-shaped cam, a rotating shaft, an active swing rod, a grinding block seat and a connecting flange, wherein the wave-shaped cam is drivingly connected to the shaft sleeve, the connecting flange is fixed to the grinding head seat, the rotating shaft passes through the connecting flange and is rotatably connected to the grinding head seat, the grinding block seat is arranged on the rotating shaft, the grinding block is arranged on the grinding block seat, the active swing rod is located in the grinding head seat and is fixed on the rotating shaft, and the wave-shaped cam drives the active swing rod to swing so as to make the grinding block seat swing;

[0018] A second sealing ring is sleeved on the rotating shaft, the second sealing ring is located between the rotating shaft and the connecting flange, and the second sealing ring is a V-shaped sealing ring or a Y-shaped sealing ring.

[0019] In the above-mentioned polishing grinding head, the connecting flange includes a flange plate and a connecting sleeve, the connecting sleeve is inserted on the grinding head seat, the flange plate is located outside the grinding head seat and is fixedly connected to the grinding head seat, and a third sealing ring is provided between the flange plate and the grinding head seat.

[0020] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0021] In the present invention, a silicone rubber pad is used to seal between the grinding head seat and the bottom cover. By utilizing the ability of silicone rubber not to easily undergo plastic deformation, the silicone rubber pad has a durable sealing ability and is not easily invalidated during long-term use, thereby ensuring that grease will not leak from between the grinding head seat and the spindle. The sealing effect is improved, and the static joint surface between the parts that cause grease leakage in the grinding head cavity is effectively sealed.

[0022] At the same time, a sealing ring is added between the grinding head and the base body to further prevent oil leakage from the polishing grinding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0024] Figure 1 is a schematic structural diagram of a first embodiment of the present invention;

[0025] Figure 2 is a structural cross-sectional view of a first embodiment of the present invention;

[0026] Figure 3 The first embodiment of the present invention Figure 2 A partial enlarged view of A;

[0027] Figure 4 The first embodiment of the present invention Figure 2 A partial enlarged view of B;

[0028] Figure 5 The first embodiment of the present invention Figure 2 A partial enlarged view of C.

[0029] Among them, the reference numerals of each figure are:

[0030] 1. Spindle; 2. Bushing; 3. Grinding head seat; 31. Grinding head cover; 32. Seat body; 321. Annular groove; 33. First sealing ring; 4. Grinding block; 5. Swing mechanism; 51. Wave cam; 52. Rotating shaft; 521. Second sealing ring; 53. Active rocker arm; 54. Grinding block seat; 55. Connecting flange; 551. Flange; 552. Connecting sleeve; 553. Third sealing ring; 6. Spherical bearing; 7. Bottom cover; 71. Pressing surface; 8. Silicon rubber pad. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0033] Reference Figures 1 to 5 As shown, a polishing grinding head comprises a main shaft 1, a sleeve 2, a grinding head seat 3, a grinding block 4 and a swing mechanism 5, wherein the sleeve 2 is sleeved on the main shaft 1, the lower part of the sleeve 2 is fixedly connected to the grinding head seat 3, and the main shaft 1 drives the grinding head seat 3 to rotate through the sleeve 2; the swing mechanism 5 is arranged on the grinding head seat 3, the grinding block 4 is connected to the swing mechanism 5, and the swing mechanism 5 drives the grinding block 4 to swing; there is a gap between the main shaft 1 and the sleeve 2, the grinding head seat 3 is connected to the main shaft 1 through a joint bearing 6, a bottom cover 7 for pressing the joint bearing 6 is provided at the lower end of the main shaft 1, an annular silicone rubber pad 8 is provided between the bottom cover 7 and the grinding head seat 3, and the silicone rubber pad 8 is coaxial with the main shaft 1;

[0034] There is a gap between the sleeve 2 and the main shaft 1. The grinding head seat 3 is connected to the main shaft 1 through the joint bearing 6, so that the grinding head seat 3 can shake slightly. A silicone rubber pad 8 is arranged between the grinding head seat 3 and the bottom cover 7. The ability of silicone rubber not to easily undergo plastic deformation is utilized to make the silicone rubber pad 8 have a durable sealing ability, which is not easy to fail during long-term use, ensuring that grease will not leak from between the grinding head seat 3 and the main shaft 1; the sealing effect is improved, and the static joint surface between the parts that cause grease leakage in the grinding head cavity is effectively sealed.

[0035] In this embodiment, the bottom cover 7 presses the silicone rubber pad 8 onto the grinding head seat 3 via the pressing surface 71, and the pressing surface 71 is an annular slope surface that gradually shrinks in a direction away from the lower end of the spindle 1;

[0036] The spherical bearing 6 is close to the inner ring of the silicone rubber pad 8, so the pressing surface 71 is set to be an annular slope surface. When the silicone rubber pad 8 is pressed, the inner ring of the silicone rubber pad 8 is subjected to a greater force, and the sealing effect is better;

[0037] However, the slope of the pressing surface 71 should not be too large. If the slope of the pressing surface 71 is too large, the contact area will be affected, and the difference between the inside and outside of the silicone rubber pad 8 will be too large, which will affect the elastic force and further affect the resetting of the grinding head seat 3.

[0038] Preferably, the angle α between the pressing surface 71 and the radial direction of the main shaft 1 is 1° to 5°.

[0039] In this embodiment, the hardness of the silicone rubber pad 8 is 45-80HA; if the silicone rubber pad 8 is too hard, it is difficult to deform, and the silicone rubber pad 8 is easily worn during a long grinding and polishing process; if the silicone rubber pad 8 is too soft, it is too easy to deform, which will affect the sealing effect, so it needs to be kept within a suitable range;

[0040] Preferably, the hardness of the silicone rubber pad is 55-75HA.

[0041] In this embodiment, the grinding head seat 3 includes a grinding head cover 31 and a seat body 32. The grinding head cover 31 is rotatably connected to the upper part of the sleeve 2, the seat body 32 is fixedly connected to the lower part of the sleeve 2, the seat body 32 is connected to the spindle 1 through a spherical bearing 6, the seat body 32 has an annular first mounting surface, the grinding head cover 31 has an annular second mounting surface, the seat body 32 is fixedly connected to the grinding head cover 31 and the first mounting surface is in contact with the second mounting surface, and the first mounting surface and the second mounting surface are sealed by a first sealing ring 33;

[0042] The grinding head cover 31 and the base body 32 of the conventional grinding head are sealed with sealant, which has a complicated process and is difficult to disassemble. However, in this embodiment, a sealing ring is used for sealing, which makes disassembly more convenient, and the sealing ring is not easy to fail and has a good sealing effect.

[0043] Specifically, an annular groove 321 is provided on the first mounting surface, the first sealing ring 33 is located in the annular groove 321, and the second mounting surface is pressed onto the first sealing ring 33 to deform the first sealing ring 33 to complete the sealing.

[0044] In some other embodiments, the annular groove 321 may also be provided on the second mounting surface.

[0045] In this embodiment, the first sealing ring 33 is preferably made of silicone rubber and has a durable sealing performance.

[0046] In this embodiment, the cross-sectional outer contour of the first sealing ring 33 is a rectangle, which increases the contact area with the first mounting surface and the second mounting surface and improves the sealing capability.

[0047] In some other embodiments, the cross-sectional outer contour of the first sealing ring 33 may be circular or elliptical.

[0048] In this embodiment, the seat body 32 and the grinding head cover 31 are fixedly connected by a first locking accessory (not shown in the figure). The first locking accessory is a bolt or a screw. The first locking accessory passes through the first mounting surface and the second mounting surface to press the seat body 32 and the grinding head cover 31 together. The first sealing ring 33 is located on the side of the first locking accessory close to the main shaft 1, so that grease can be well sealed by the first sealing ring 33 and will not penetrate into the first locking accessory.

[0049] In this embodiment, the swing mechanism 5 includes a wave cam 51, a rotating shaft 52, an active swing rod 53, a grinding block seat 54 and a connecting flange 55. The wave cam 51 is connected to the shaft sleeve 2 in a transmission manner. A gear transmission mechanism is arranged inside the grinding head seat 3. The shaft sleeve 2 rotates to allow the gear transmission mechanism to operate, thereby driving the wave cam 51 to rotate. The connecting flange 55 is fixed on the grinding head seat 3. The rotating shaft 52 passes through the connecting flange 55 and is connected to the grinding head seat 3 in a rotation manner. The grinding block seat 54 is arranged on the rotating shaft 52. The grinding block 4 is arranged on the grinding block seat 54. The active swing rod 53 is located in the grinding head seat 3 and is fixed on the rotating shaft 52. The rotation of the wave cam 51 can push the active swing rod 53 to swing. The active swing rod 53 drives the rotating shaft 52 to rotate, so that the grinding block seat 54 swings. The grinding block 4 swings together with the grinding block seat 54 to perform grinding and polishing.

[0050] A second sealing ring 521 is sleeved on the rotating shaft 52, and the second sealing ring 521 is located between the rotating shaft 52 and the connecting flange 55. The second sealing ring 521 is a V-shaped sealing ring or a Y-shaped sealing ring, so as to prevent grease from leaking from between the rotating shaft 52 and the connecting flange 55; a skeleton oil seal is generally set on the traditional grinding head rotating shaft 52 to prevent oil leakage, but since the grinding block 4 is subjected to great force during grinding and polishing, the rotating shaft 52 will also vibrate, and the skeleton of the skeleton oil seal is easy to deform and its spring is easy to fail, so the skeleton oil seal is easy to leak oil; the second sealing ring 521 still relies on an elastomer to contact and seal the rotating shaft 52, and is not easy to fail during the long-term vibration of the rotating shaft 52, and has a better sealing effect.

[0051] In this embodiment, the connecting flange 55 includes a flange 551 and a connecting sleeve 552. The connecting sleeve 552 is inserted on the grinding head seat 3. The flange 551 is located outside the grinding head seat 3 and is fixedly connected to the grinding head seat 3. A third sealing ring 553 is provided between the flange 551 and the grinding head seat 3 to prevent grease from leaking from between the flange 551 and the grinding head seat 3.

[0052] Specifically, an annular groove is provided on one side of the flange 551 close to the grinding head seat 3, and the third sealing ring 553 is located in the groove. The flange 551 is pressed onto the grinding head seat 3 to squeeze the third sealing ring 553 to achieve sealing.

[0053] The flange 551 is locked onto the grinding head seat 3 through a second locking accessory, the second locking accessory is a screw or a bolt, and the third sealing ring 553 is located on a side of the second locking accessory close to the connecting sleeve 552 to prevent grease from penetrating from the second locking accessory.

[0054] In this embodiment, the third sealing ring 553 is an O-ring.

[0055] In this embodiment, an annular copper sheet is provided between the flange 551 and the grinding head seat 3. The annular copper sheet is coaxial with the connecting sleeve 552 and is relatively soft. The flange 551 presses the annular copper sheet 554 onto the grinding head seat 3, causing the annular copper sheet 554 to deform and thereby achieve sealing.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A polishing grinding head, comprising a main shaft, a sleeve, a grinding head seat and a grinding block, wherein the sleeve is sleeved on the main shaft, the lower part of the sleeve is fixedly connected to the grinding head seat, and the main shaft drives the grinding head seat to rotate through the sleeve; the grinding block is arranged on the grinding head seat, the grinding head seat is connected to the main shaft through a bearing, and the lower end of the main shaft is provided with a bottom cover for pressing the bearing, characterized in that: An annular silicone rubber pad is arranged between the bottom cover and the grinding head seat.

2. The polishing grinding head according to claim 1, characterized in that: The hardness of the silicone rubber pad is 45-80HA.

3. The polishing grinding head according to claim 1, characterized in that: The hardness of the silicone rubber pad is 55-75HA.

4. The polishing grinding head according to claim 1, characterized in that: The silicone rubber pad is coaxial with the main shaft; there is a gap between the main shaft and the sleeve, and the bearing is a spherical bearing.

5. The polishing grinding head according to claim 1, characterized in that: The bottom cover presses the silicone rubber pad onto the grinding head seat through a pressing surface, and the pressing surface is an annular slope surface that gradually shrinks in a direction away from the lower end of the main shaft.

6. The polishing grinding head according to claim 1, characterized in that: The grinding head seat includes a grinding head cover and a seat body, the grinding head cover is rotatably connected to the upper part of the sleeve, the seat body is fixedly connected to the lower part of the sleeve, the seat body is connected to the main shaft through the joint bearing, the seat body has an annular first mounting surface, the grinding head cover has an annular second mounting surface, the seat body is fixedly connected to the grinding head cover and allows the first mounting surface to contact the second mounting surface, and the first mounting surface and the second mounting surface are sealed by a first sealing ring.

7. The polishing grinding head according to claim 6, characterized in that: An annular groove is provided on the first mounting surface or the second mounting surface, and the first sealing ring is located in the annular groove.

8. The polishing grinding head according to claim 6, characterized in that: The cross-sectional outer contour of the first sealing ring is a rectangle.

9. The polishing grinding head according to claim 1, characterized in that: The grinding head seat is provided with a swing mechanism, the grinding block is connected to the swing mechanism, and the swing mechanism drives the grinding block to swing; The swing mechanism comprises a wave-shaped cam, a rotating shaft, an active swing rod, a grinding block seat and a connecting flange, wherein the wave-shaped cam is drivingly connected to the shaft sleeve, the connecting flange is fixed to the grinding head seat, the rotating shaft passes through the connecting flange and is rotatably connected to the grinding head seat, the grinding block seat is arranged on the rotating shaft, the grinding block is arranged on the grinding block seat, the active swing rod is located in the grinding head seat and is fixed on the rotating shaft, and the wave-shaped cam drives the active swing rod to swing so as to make the grinding block seat swing; A second sealing ring is sleeved on the rotating shaft, the second sealing ring is located between the rotating shaft and the connecting flange, and the second sealing ring is a V-shaped sealing ring or a Y-shaped sealing ring.

10. The polishing grinding head according to claim 9, characterized in that: The connecting flange includes a flange plate and a connecting sleeve, the connecting sleeve is inserted on the grinding head seat, the flange plate is located outside the grinding head seat and is fixedly connected to the grinding head seat, and a third sealing ring is provided between the flange plate and the grinding head seat.

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