Polishing grinding head

Abstract

The utility model discloses a polishing grinding head, which aims to improve the sealing effect and solve the problem of effective sealing of static joint surfaces among parts for grease leakage in a grinding head cavity, and comprises a main shaft, a shaft sleeve, a grinding head seat and a grinding block, the shaft sleeve is sleeved on the main shaft, the lower part of the shaft sleeve is fixedly connected with the grinding head seat, and the grinding block is fixedly connected with the grinding head seat. 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 utility model 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 inside the grinding head seat can make the grinding head swing, thereby improving the grinding and polishing effect.

[0003] For example, patent 201520218290.7 discloses a grinding head device, including a grinding head revolution system and a grinding block seat swing system, wherein the grinding head revolution system 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 via the grinding head spindle connecting sleeve; the grinding head spindle drives the grinding head lower housing to rotate via 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 by bolts, thereby driving the grinding head lower box to rotate. The grinding head lower box and the grinding head spindle are connected by bearings. The lower end of the grinding head spindle is connected to a bottom cover, which can fix the bearing. At the same time, a sealing gasket is provided between the bottom cover and the grinding head lower box to prevent oil leakage from the grinding head lower box and the bearing.

[0005] In practice, it is found that the sealing gasket is made of fluororubber, which is very hard. When it is subjected to static friction for a long time, it will suffer severe wear and corrosion and is very likely to fail, thus causing oil leakage. Utility Model Content

[0006] The main purpose of the utility model 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 the first aspect of the utility model, 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 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, 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 includes a waveform cam, a rotating shaft, an active swing arm, a grinding block seat and a connecting flange, the waveform cam is transmission-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 rotationally 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 arm is located in the grinding head seat and fixed on the rotating shaft, and the waveform cam drives the active swing arm to swing, so that the grinding block seat swings;

[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. 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 utility model 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 taking advantage of the fact that silicone rubber is not easily deformed, the silicone rubber pad has a durable sealing ability and is not easily invalidated during long-term use, thereby ensuring that grease does 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 may leak grease 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 to further prevent oil leakage from the polishing grinding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 It is a structural diagram of the first embodiment of the utility model;

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

[0026] Figure 3 This is the first embodiment of the utility model Figure 2 A partial enlarged view of A;

[0027] Figure 4 This is the first embodiment of the utility model Figure 2 A partial enlarged view of B;

[0028] Figure 5 This is the first embodiment of the utility model 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. Silicone rubber pad. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail, examples of which 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. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not 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 includes a main shaft 1, a sleeve 2, a grinding head seat 3, a grinding block 4 and a swing mechanism 5. The sleeve 2 is sleeved on the main shaft 1, and the lower part of the sleeve 2 is fixedly connected to the grinding head seat 3. The main shaft 1 drives the grinding head seat 3 to rotate through the sleeve 2; the swing mechanism 5 is provided on the grinding head seat 3, and 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 and the main shaft 1 are connected through a joint bearing 6, and the lower end of the main shaft 1 is provided with a bottom cover 7 for pressing the joint bearing 6, and 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 long-lasting 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; improving the sealing effect, and effectively sealing the static joint surfaces between parts to solve the problem of grease leakage in the grinding head cavity.

[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. The pressing surface 71 is an annular slope that gradually contracts 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 an annular slope. When the silicone rubber pad 8 is pressed, the inner ring of the silicone rubber pad 8 is subjected to 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, it will affect the contact area, and the difference between the inside and outside of the silicone rubber pad 8 will be too large, affecting the elastic force and further affecting the resetting of the grinding head seat 3.

[0038] Preferably, the included 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 will be difficult to deform, and the silicone rubber pad 8 will be easily worn during a long grinding and polishing process. If the silicone rubber pad 8 is too soft, it will be too easy to deform, which will affect the sealing effect. Therefore, it is necessary to maintain it within an appropriate 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 shaft sleeve 2, and the seat body 32 is fixedly connected to the lower part of the shaft sleeve 2. The seat body 32 is connected to the main shaft 1 through a spherical bearing 6. The seat body 32 has an annular first mounting surface, and 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 allows the first mounting surface to contact the second mounting surface. The first mounting surface and the second mounting surface are sealed by a first sealing ring 33.

[0042] The traditional grinding head uses sealant to seal the grinding head cover 31 and the base body 32, which is complicated and difficult to disassemble. However, in this embodiment, a sealing ring is used for sealing, which is more convenient to disassemble, 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 and 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 rectangular, 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 base 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 base 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 the 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 waveform cam 51, a rotating shaft 52, an active rocker arm 53, a grinding block seat 54 and a connecting flange 55. The waveform cam 51 is connected to the shaft sleeve 2 in a transmission manner. A gear transmission mechanism is provided inside the grinding head seat 3. The shaft sleeve 2 rotates to allow the gear transmission mechanism to operate, thereby driving the waveform cam 51 to rotate. The connecting flange 55 is fixed to the grinding head seat 3. The rotating shaft 52 passes through the connecting flange 55 and is rotatably connected to the grinding head seat 3. The grinding block seat 54 is provided on the rotating shaft 52. The grinding block 4 is provided on the grinding block seat 54. The active rocker arm 53 is located in the grinding head seat 3 and is fixed on the rotating shaft 52. The rotation of the waveform cam 51 can push the active rocker arm 53 to swing. The active rocker arm 53 drives the rotating shaft 52 to rotate, so that the grinding block seat 54 swings, and the grinding block 4 swings along 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, the skeleton of the skeleton oil seal is easy to deform, and its spring is easy to fail, so the skeleton oil seal is prone to oil leakage; 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 into 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 the 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 tightly onto the grinding head seat 3, squeezing the third sealing ring 553 to achieve sealing;

[0053] The flange 551 is locked to the grinding head seat 3 through a second locking accessory, which is a screw or bolt. The third sealing ring 553 is located on the side of the second locking accessory close to the connecting sleeve 552 to prevent grease from seeping out of 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 in texture. 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 the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose 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 and the main shaft are connected 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 provided 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 4, 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, and 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, and 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. 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 includes a waveform cam, a rotating shaft, an active swing arm, a grinding block seat and a connecting flange, the waveform cam is transmission-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 rotationally 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 arm is located in the grinding head seat and fixed on the rotating shaft, and the waveform cam drives the active swing arm to swing, so that the grinding block seat swings; A second sealing ring is sleeved on the rotating shaft. The second sealing ring is located between the rotating shaft and the connecting flange. 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 into the grinding head seat. The flange plate is located outside the grinding head seat and is fixedly connected to the grinding head seat. A third sealing ring is provided between the flange plate and the grinding head seat.

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